CA1306897C - Printer having identifiable interchangeable recording heads or pens - Google Patents
Printer having identifiable interchangeable recording heads or pensInfo
- Publication number
- CA1306897C CA1306897C CA000574125A CA574125A CA1306897C CA 1306897 C CA1306897 C CA 1306897C CA 000574125 A CA000574125 A CA 000574125A CA 574125 A CA574125 A CA 574125A CA 1306897 C CA1306897 C CA 1306897C
- Authority
- CA
- Canada
- Prior art keywords
- printhead
- nozzles
- nozzle
- pen
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/10—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/34—Bodily-changeable print heads or carriages
Abstract
Abstract of the Disclosure A dot-matrix printer is provided with different types of recording heads or pens which are interchange-ably attachable to the printer carriage. The pens are provided with individual codes which are read by the printer control system and used to reconfigure its control function to suit the control requirements of the identified head. Such a system may include a micro-processor responsive to individual sets of instructions or programs providing new and different processing capabilities for printing control in response to the insertion of a new recording head or pen.
Description
13~b~ J I~
PRINTER HAVING IDENTIFIABLE INTERCHA~GEABLE
RECORDING HEADS OR PENS
sackqround of the Invention 1. Field of the Invention This invention relates to printers particularly dot-matrix types of printers. More particularly this invention relates to drop-on-demand types of dot-matrix printers, such as thermal inkjet printers in which provi-sion is made for interchanging and identifying the -~
recording heads or pens for the purpose of producing text or graphics in different colors and/or differing ink dot densities, sizes, for example.
PRINTER HAVING IDENTIFIABLE INTERCHA~GEABLE
RECORDING HEADS OR PENS
sackqround of the Invention 1. Field of the Invention This invention relates to printers particularly dot-matrix types of printers. More particularly this invention relates to drop-on-demand types of dot-matrix printers, such as thermal inkjet printers in which provi-sion is made for interchanging and identifying the -~
recording heads or pens for the purpose of producing text or graphics in different colors and/or differing ink dot densities, sizes, for example.
2. Description of the Related Art Inkjet recording heads or pens are used in printers and plotters. These include thermal and piezo-electric for expelling ink. The term printer as used herein is used as a term of convenience and is not intended to exclude the other types of recording such as plotting.
Thermal inkjet printers are described in the Hewlett-Packard Journal, May 1985, Volume 36, No. 5, which is included herein in its entirety by reference thereto. The production of ink drops by thermal exitation means is described in detail in terms of a specific implementation including a disposable pen which could be replaced by another similar pen.
As noted hereinabove there are a number of reasons for interchanging pens of different types, for example, black ink is used in most printing applications but there is a developing need for the use of colored inks in printing text and graphics. Heretofore printers having recording heads or pens designed for single color print-ing have not been retrofited with color recording headsor pens which may be interchangably fitted into the printer carriage designed for the single color pen, because of differing requirements resulting from pen body 13~6~'f~
configurations, ususally larger for accommodating several colors of ink, nozzle spacing and grouping, and control requirements to name a few. While multicolor pens can be provided with a chamber for black ink, where a printer is predominately used for black text or graphics, a supply of black ink in a multicolor pen fitting in an all black or other single color pen, printer carriage, is limited in volume. Thus interchangeable single color/multicolor pens in a printer increase the utility of an otherwise single color printer or recorder.
Although patents 4, 511,907; 4,540,996; 4,611,219;
4,630,076 and 4,631,548 are directed to multicolor inkjet printers, none appear to suggest or teach configurations for a multicolor recording head which is interchangeable with a single color recording head in a single color printer. ~ikewise, none of these patents, lacking the concept of interchangability, provide any arrangement whereby interchangeable heads each carry an identifying code for which specific printing controls are required.
Thus these patents are related to this invention only in the sense of the use of individual nozzle groups for differing colors and in the employment of dot-matrix techniques for printing but interchangability of the heads or the pens for any purpose together with their individual identities for control purposes appear to be lacking.
Still further there appears to be no reference in the prior art with regard to the interchangability of heads in a particular printer to provide different dot densities, different drop volumes or combinations of such factors in single color and multicolor pens.
Summary of the Invention The present invention is directed to a printer having interchangable recording heads or pens each of which is provided with a specific code which identifies the type of head or pen that has been mounted on the printer carriage. The printer reads this code and 6~'`7 provides a control for controlling the pen in printing text or graphics according to the requirements for that particular pen. In one practical embodiment of this invention applied to thermal inkjet pens extra electrical contact pads are provided on the resistor network which fires the nozzels of the pen. These contact pads are selectively electrically connected in the resistor net-work which fires the individual nozzles in several unique configurations each of which defines a specific pen such as single color, multicolor, single drop, multiple drop and so on. The code provided by these unique confiqura-tions of the electrical pens is detectable by the printer so that the type of head which is inserted is determined with certainty and the printer provides the appropriate control of the pen during printing. In this embodiment, the individual electrical pads are selectively connected (or not connected) to the resistor circuits or circuit traces. By individually toggeling the resistor lines at high or low voltage levels and detecting a voltage level shift on the lines associated with the extra contact pads, which are the head identity contact pads, a connec-tion (or lack of connection) may be detected. With this implementation (connection or no connection), using two extra pads, nine unique connections may be made to iden-tify the particular head that is in the printer. Thus multi-drop single color, multi-drop multicolor, single drop single color, single drop multicolor, heads of differing drop sizes, colors, etc., may be individually identified.
While it is convenient in a thermal inkjet type of pen to implement the code for particular pens in the resistor network for firing the individual nozzles, the code may be implemented on the pen by other means includ-ing electrical pad configurations which are not associ-ated with the resistor network, projections or depres-sions at convenient locations on the pen body which can be sensed by switches on the printer carriage, a conven-tional bar code on the pen body which can be read by a 13(~ 7 bar code reader, or reflecting strips on the pen body which can be detected by light sensitive devices on the printer carriage. This listing of alternatives is by no means exhaustive or intended to be exhaustive of arrangements for providinq an identifiable code associated with a specific pen in a printer.
Other aspects of this invention are as follows:
A dot matrix printer, comprising:
a movable printhead carriage;
a print media;
means for advancing said print media in a direction orthogonal to printhead carriage movement;
single color and multicolor thermal inkjet printheads:
a nozzle plate on each printhead having a plurality of nozzles and means for admitting ink to said nozzles;
each multicolor printhead having a nozzle group for each color of ink in the nozzle plate thereat, each nozzle group having the same nozzle format as the nozzles of a single color printhead but of a lesser number of nozzles than the number of nozzles for the single color of ink of the single color printhead;
means for mounting single color or multicolor 5 printheads on said printhead carriage;
motor means for driving the printhead carriage to move the printhead thereon across said print media;
a resistor network on each printhead having a resistor at each nozzle, which resistor when energized 0 heats and expels ink from the nozzle thereat;
a print control system for selectively energizing resistors of said resistor network of said printhead for printing on said print media during printhead carriage movement;
printhead identification means on each printhead comprising patterns of resistors forming part of said 131;~7 5a resistor network providing a unique code for each printhead;
detection means for energizing said patterns of resistors of said printhead identification means for providing electrical signal identifying a specific printhead; and means in said print control system responsive to said electronical signals for initiating operation of said print control system to selectively energize 0 resistors at the nozzles of said specific printhead.
Thermal inkjet printhead identification means, comprising;
a printhead body having at least one ink chamber;
a nozzle plate on said printhead body having 5 nozzles communicating with said chamber;
a resistor network having an ink expulsion resistor at each nozzle;
contact pads in said resistor network and individual circuits connecting individual contact pads 0 to individual resistors; and at least two printhead identification contact pads, each disposed between selected different pairs of said contact pads, and forming part of a printhead identification resistor network including at least two 5 resistors for each printhead identification contact pad.
The utility of this invention in enlarging the printing capabilities of the printer is apparent from the single color/multicolor enlargement in printing scope alone, as discussed above. This invention provides a printer which is capable of reconfiguring its control capabilities according to the code which is sensed when the different types of pens are mounted on the carriage. By this expedient, new and different printing capabilities are provided with the insertion of a new pen. Using a multiprocessor in the printer control system for processing input defined by the pen identity code, reconfigured control potentials are 135b6~
achieved in the selection, for example, of instructions or instruction changes resident in a host controller for the microprocessor.
Brief Description of the Drawinas Figure 1 is a block diagram of a thermal inkjet printer system;
Figure 2 is an exploded perspective view of one type of a thermal inkjet pen which is employable in practicing this invention;
Figure 3 is a schematic fragment of the end of a flexible circuit in Figure 2 which engages the pickup end of a flexible circuit on the printer carriage, showing how the electrical connections are made;
Figure 4 illustrates the layout or the format of the nozzles of a single color recorder head or pen of a type that may be employed in practicing this invention;
Figure 5 illustrates the layout of the nozzle or orifice plate of Figure 2 showing the resistor networks;
Figure 6 shows the actual electrical pad layout of the end of the flexible circuit attached to the detector ~3~
of the printer carriage; and Figure 7 illustrates the logical concept of nine pen identity codes according to one specific embodiment of this invention.
Description of the Preferred Embodiment The block diagram of Figure 1 illustrate one type of printer control system. Such a system comprises a printer (shown here schematically) having a chassis 1 on which a carriage 2 is slidable mounted for movement from one side to the other of paper in a paper advance mechan-ism 3 mounted in the chassis. The paper advance mechanism 3 moves the paper in an orthogonal direction with respect to the carriage. A carriage motor 4 and a paper advance motor 5 drive the carriage and advance the paper under the control of motor drivers 6. Pen drivers 7, supplied with power from a power supply 8 individually energize the ink drop firing resistors of a pen 9 which is secured on the printer carriage 4 by means of a pen attachment mechanism 9a. The ink drop firing resistors are not shown at this point. The system is controlled by a micro-processor 10 which receives data and instructions via an input-output interface 11 coupled to an instruction and data source 12 for the system. Pen identification code 13 on the pen 9, which may be a part of the pen ink drop firing, resistor network or some other identification, is detected and the pen identification by means of the pen identification circuit 14 is used to select one of a plurality of inputs associated with the particular pen at the input source 12, to provide instructions to the microprocessor 10 for controlling that particular pen.
Data for the particular text or graphics to be printed by the pen placed in the printer may be part of the selected input or may be separately programmed via the input-output interface 11 by a data source lS where such provision is convenient.
In instances where pen identification code 13 comprises a part of the resistor network which fires the ~.3l~ r~ ~' droplets from the individual nozzles of the pen, the pen drivers under the control of the microprocessor may interrogate the specific resistor circuits associated with the identification contact pads to obtain the pen identification code. This is done under the control of the microprocessor in which case the microprocessor, interpreting the signals derived from the specific code, provides a pen identification signal which may be coupled to the separate pen identity circuit 14, or used directly, to select one of the inputs, Input l-Input 9, from the instruction source 12, which may also include data for programming the microprocessor in its control of the printhead drivers as well as instructions for controlling the level of input of the power supply 8, where needed, to properly control that particular pen.
Otherwise the microprocessor may look to a code derived from switches from bar codes or light reflective devices, for information identifying the particular head.
One type of head which may be employed in practic-ing this invention is illustrated in the explodedperspective view of Figure 2. This is a thermal inkjet type of pen having a plurality of chambers individually isolated from one another for containing different colors of ink. The pen comprises a pen body 20 having four individual chambers each of which receives a block of foam 21 saturated with ink of a selected color. A back plate 22 seals the body 20 and the individual chambers.
Individual holes 23 in the front face of the pen body 20 provide communication for each pen body chamber with individual openings 24 in a front plate 25 via four openings 26 in a gasket 27 which seals the front plate 25 to the pen body 20 and provides isolated communication of each pen body chamber with a selected one of the openings 24 through the front plate 25. A nozzle plate 30 which fits into a cavity 31 in the front of the front plate 25 is provided with groups of nozzles 32 aligned with the openings 24 in the front plate. Contact pads 33 along the opposite side edges of the nozzle plate 30 provide 13~
connection via circuit traces within the individual resistors at the individual nozzles. These details are shown in Figure 5. The individual contact pads 33 provide a means for selectively connecting electrical energy to the individual resistor circuits. Such connection is accomplished by means of a flexible circuit 35 provided with circuit traces 36 terminating in contact pads along the back of the side edges of the slot in the flexible circuit. The pads are not visibie here. This slot straddles the nozzle plate 30 in assembled position so that the contact pads on the back face of the flexible circuit engage the contact pads 33 on the nozzle plate.
The flexible circuit in assembled position extends beneath the pen body 20 where it is secured by pressure sensitive adhesive 37, or by other means, to the bottom side of the pen body 20.
There are electrical pad connections at both ends of the flexible circuit traces 36. One set of electrical contact pads, as stated above, is on the back side of the flexible circuit 35 on the opposite sides of the slot therein, each of which engages a circuit trace in the flexible circuit. The ends of the circuit traces at the opposite end of the flexible circuit 35 are terminated in contact pads on the bottom side of the flexible circuit 35, as viewed. Figure 3 illustrates such typical connec-tions. Figure 3 is not intended to represent specific connection configurations on the flexible circuit 35, but is intended merely to indicate how these connections are made. A fragment of the flexible circuit 35 is shown on the left in Figure 3 and may typically represent the contact pads on both ends of the flexible circuit 35. A
second flexible circuit 38, also comprising circuit traces and contact pads, represents, for example, a flex-ible circuit end on the printer carriage 2 which engages the end of the flexible circuit 35 beneath the pen body 20, to provide electrical connection between the pen 9 on the carriage 2 and printer drivers 7 (Fig. 1) which are located off the carriage. The contact pads on the 13~'6~9~
g flexible circuit 38 are provided with projecting dimples to provide positive engagement with the contact pads on the confronting section of the flexible circuit 35.
Similar contacts may be provided between the contacts on the flexible circuit 35 and the contact pads 33 on the nozzle plate 30. Such specific connections are illustra-tive and not limiting.
Simplifications in the control system firmware and programming are realized if formating of the nozzle configurations on the different types of pens are similar, for example, nozzle formats on a multicolor pen being similar to the nozzle format on a single color pen.
Figure 4 illustrates the nozzle format for one type of single color pen. The nozzle plate of Figure 4 comprises two columns of nozzles there being 25 nozzles in each column. The nozzles in each column are arranged in staggered groups of 3 as seen. The nozzles in the right column which are odd numbered nozzles 1-49 are displaced vertically as viewed with respect to the nozzles in the left column which are the even numbered nozzles, 2-50, by one-half the distance between the nozzles in the columns.
TABLE I
¦ FIRING I SHIFT OFFSET I TIMING
SEQUENCE I (lPP) I OFFSET (UM) l_____________l___________________l_____________l 0 1 20,46 119,45 1 0.0 1 114,40 113,39 1 2.5 2 18,34 17,33 1 5.5 3 12,28 11,27 1 8.0 4 122,48 121,47 111.0 116,42 115,41 113.5 6 110,36 19,35 116.5 1 7 14,30 13,29 119.0 1 8 124,50 123,49 122.0 9 118,44 117,43 124.5 112,38 111,37 127.5 11 16,32 15,31 130.0 12 1 26 1 25 133.0 .. _ I .
Table I illustrates the firing sequence of the resistors associated with each of the nozzles of Fiqure ,~, . ... . .
13~6~
4. The location of these resistors will be apparent from Figure 5 discussed hereinafter. The resistors on the pen must be fired in a particular order to minimize cross talk. The location of the nozzles is set so that that dots will all be fired in the same vertical column when there is a constant scan or printing velocity. The dot firing sequence and relative nozzle locations in microns for a specific example are specified in Table I. When printing left to right the indicated sequence is used.
When printing right to left the resistors are fired in the reverse sequence.
The nozzle format of Figure 4 is retained in the individual nozzle groups of the printhead 30 as seen in Figure 5. In affect the nozzle column of Figure 4 is divided by 4. Each nozzle group comprises 12 nozzles arrange in 2 columns of 6 having the dot row spacing between corresponding nozzles of respective rows and having the same col~mn spacings as those of the single color pen. Since this multicolor pen has the same contin-uous dot per inch spacing with four color capability as the single color pen all of the single color printer text and graphics control characteristics are utilized. Only firmware and software require color capability. Format-ting is required to provide the dot stagger offset between the nozzle groups. Thus within each nozzle group the ink drop firing sequence is the same as that of the single color pen. Figure 5 illustrates at an enlarged scale the layout of the nozzle plate 30 of Figure 2. Only the openings or the nozzles 32 of the nozzle plate 30 are shown in this Figure 5, since the figure is already highly detailed. These nozzles 32 are shown in their individual locations over the individual resistors R in the respective nozzle groups. The individual circuits or resistors R are connected by circuit traces C to the respective contact pads. The even numbered contact pads 2 through 50 appear on the left side of Figure 5 and the odd numbered contact pads 1 through 49 are shown on the right side of the substrate of Figure 5. The common ~ 3 ~
contact pads for this substrate circuit system appear in the four corners of the substrate.
Only 48 of the 50 nozzles of Figure 4 are needed in developing the nozzle and circuit format of the nozzle plate 30 of Figure 5. In this situation the nozzles 49 and 50 are not used, although they still appear on the nozzle plate as seen. This layout retains the firing sequence of the single color head with respect to the nozzles in the individual color groups. Table II below shows the firing sequence for the nozzles and resistors based upon the development of the nozzle plate of Figure 5 and shows the shift offset required in dot rows or logical print positions in firing the individual r~sis-tors.
TABLE II
-¦ FIRING l l l l I TIMING
I SEQUENCE I O ¦ 10 1 16 1 26 1 OFFSET (UM) l___________l________l________l________l________l____________l O l l 1 20 44 1 1943 1 0 1 l l 1 14 38 1 1337 1 2.5 2 1 8 32 1 7 31 1 1 1 5.5 3 1 2 36 1 1 25 1 1 1 8.0 4 l l 1 22 46 1 2145 1 11.0 l l 1 16 40 1 1~39 1 13.5 6 1 10 36 1 9 35 1 1 1 16.5 7 1 4 28 1 3 27 1 1 1 19.0 8 l l 1 24 48 1 2347 1 22.0 9 l l 1 18 42 1 1741 1 24.5 1 12 36 1 11 35 1 1 1 27.5 11 1 6 30 1 5 29 1 1 1 30.0 12 l l l l 1 33.0 Further and additional details with respect to nozzle formats for multicolor heads may be had by refer-ence to a co-pending Canadian application of C.S. Chan, et al, Serial Number 574,124 filed August 8, 1988 entitled Multi-Chamber Ink Jet Recording Head for Color Use, assigned to the assignee of this invention.
Although the approach described above in format-ting the nozzles in a multicolor head provide simplica-. . ~, ~
13~6~ ¦
tions no~ed above with respect to the control system and its programming, such nozzle formatting is not essential in practicing this invention. One approach to providing individual codes for identifying individual heads is discussed in connection with Figure 5. Similar considera-tions of course apply to other types of heads including resistor substrates 31 having individual circuit pads, circuit traces and resistors for firing the ink drops.
This of course applies to the single color nozzle format of Figure 4 except for the lateral displacement of the nozzles of the individual color groups as seen in Figure 5.
In reference to Figure 5 identification contact pads Il and I2 are provided. The contact pad Il is located between the contact pads 47 and 49 and the contact pad I2 is located between the contact pads 48 and 50. In these positions the contact pad Il may be connected to contact pad 47 or 49 or it may be connected to neither. The contact pad I2 may be connected to the contact pad 48 or the contact pad 50 or it may be connected to neither. The actual physical location of the contact pads at the end of the flexible circuit 35 beneath the pen body 20 may be seen by referring to Figure 6. Here the location of the common contact pads Cl, C2, C3 and C4 at the end of the flexible circuit 35 are shown together with the locations of the individual contact pads l through 50. Note in Figure 6 that the head identity contact pads Il and I2 are located respectively between contact pads 47 and 49 for Il and for I2 between contact pads 48 and 50.
In the circuit configurations described above there are nine possible code identities. These are depicted in Figure 7. Only some of the heads or pens are identified with a particular code to demonstrate the principal. In practice the head or pen needs to be inter-rogated only at the time that a printing operation is initiated. This therefore preferably occurs whether or not a pen is replaced with a different pen. By using this approach, there is certainty that a pen is always properly identified and a pen identification operation will therefore not be overlooked. Since pen identifica-tion interrogation occurs and is terminated prior to the commencement of a printing operation, pen identification in no way interferes with a printing operation. Addition-ally, although the resistor circuits 49 and 50 used in pen identification are not used in a printing operation associated with the specific resistor formatting of Figure 5, this in no way interfers with the pen identifi-cation function or with the printing function which follows.
In this connection it should be observed that the identification contact pads Il and I2 may be located at any convenient location in the contact pad format of Figure 5. Additionally more than one contact pad in each column of contact pads may be used to provide a higher number of identification codes.
While it is convenient to provide pen identifica-tion codes using contact pads and connections formingpart of the resistor circuit format, the means for gener-ating the different identification codes is not neces-sarily a part of the resistor format, but as noted hereinabove may be separate and apart therefrom and need only be located in some con-~enient location on the pen body itself to be sensed electrically, magnetically, optically, or otherwise, in a way providing intelligence via the microprocessor, or otherwise, for selecting the proper printer system input for controlling the pen in the printer.
Thermal inkjet printers are described in the Hewlett-Packard Journal, May 1985, Volume 36, No. 5, which is included herein in its entirety by reference thereto. The production of ink drops by thermal exitation means is described in detail in terms of a specific implementation including a disposable pen which could be replaced by another similar pen.
As noted hereinabove there are a number of reasons for interchanging pens of different types, for example, black ink is used in most printing applications but there is a developing need for the use of colored inks in printing text and graphics. Heretofore printers having recording heads or pens designed for single color print-ing have not been retrofited with color recording headsor pens which may be interchangably fitted into the printer carriage designed for the single color pen, because of differing requirements resulting from pen body 13~6~'f~
configurations, ususally larger for accommodating several colors of ink, nozzle spacing and grouping, and control requirements to name a few. While multicolor pens can be provided with a chamber for black ink, where a printer is predominately used for black text or graphics, a supply of black ink in a multicolor pen fitting in an all black or other single color pen, printer carriage, is limited in volume. Thus interchangeable single color/multicolor pens in a printer increase the utility of an otherwise single color printer or recorder.
Although patents 4, 511,907; 4,540,996; 4,611,219;
4,630,076 and 4,631,548 are directed to multicolor inkjet printers, none appear to suggest or teach configurations for a multicolor recording head which is interchangeable with a single color recording head in a single color printer. ~ikewise, none of these patents, lacking the concept of interchangability, provide any arrangement whereby interchangeable heads each carry an identifying code for which specific printing controls are required.
Thus these patents are related to this invention only in the sense of the use of individual nozzle groups for differing colors and in the employment of dot-matrix techniques for printing but interchangability of the heads or the pens for any purpose together with their individual identities for control purposes appear to be lacking.
Still further there appears to be no reference in the prior art with regard to the interchangability of heads in a particular printer to provide different dot densities, different drop volumes or combinations of such factors in single color and multicolor pens.
Summary of the Invention The present invention is directed to a printer having interchangable recording heads or pens each of which is provided with a specific code which identifies the type of head or pen that has been mounted on the printer carriage. The printer reads this code and 6~'`7 provides a control for controlling the pen in printing text or graphics according to the requirements for that particular pen. In one practical embodiment of this invention applied to thermal inkjet pens extra electrical contact pads are provided on the resistor network which fires the nozzels of the pen. These contact pads are selectively electrically connected in the resistor net-work which fires the individual nozzles in several unique configurations each of which defines a specific pen such as single color, multicolor, single drop, multiple drop and so on. The code provided by these unique confiqura-tions of the electrical pens is detectable by the printer so that the type of head which is inserted is determined with certainty and the printer provides the appropriate control of the pen during printing. In this embodiment, the individual electrical pads are selectively connected (or not connected) to the resistor circuits or circuit traces. By individually toggeling the resistor lines at high or low voltage levels and detecting a voltage level shift on the lines associated with the extra contact pads, which are the head identity contact pads, a connec-tion (or lack of connection) may be detected. With this implementation (connection or no connection), using two extra pads, nine unique connections may be made to iden-tify the particular head that is in the printer. Thus multi-drop single color, multi-drop multicolor, single drop single color, single drop multicolor, heads of differing drop sizes, colors, etc., may be individually identified.
While it is convenient in a thermal inkjet type of pen to implement the code for particular pens in the resistor network for firing the individual nozzles, the code may be implemented on the pen by other means includ-ing electrical pad configurations which are not associ-ated with the resistor network, projections or depres-sions at convenient locations on the pen body which can be sensed by switches on the printer carriage, a conven-tional bar code on the pen body which can be read by a 13(~ 7 bar code reader, or reflecting strips on the pen body which can be detected by light sensitive devices on the printer carriage. This listing of alternatives is by no means exhaustive or intended to be exhaustive of arrangements for providinq an identifiable code associated with a specific pen in a printer.
Other aspects of this invention are as follows:
A dot matrix printer, comprising:
a movable printhead carriage;
a print media;
means for advancing said print media in a direction orthogonal to printhead carriage movement;
single color and multicolor thermal inkjet printheads:
a nozzle plate on each printhead having a plurality of nozzles and means for admitting ink to said nozzles;
each multicolor printhead having a nozzle group for each color of ink in the nozzle plate thereat, each nozzle group having the same nozzle format as the nozzles of a single color printhead but of a lesser number of nozzles than the number of nozzles for the single color of ink of the single color printhead;
means for mounting single color or multicolor 5 printheads on said printhead carriage;
motor means for driving the printhead carriage to move the printhead thereon across said print media;
a resistor network on each printhead having a resistor at each nozzle, which resistor when energized 0 heats and expels ink from the nozzle thereat;
a print control system for selectively energizing resistors of said resistor network of said printhead for printing on said print media during printhead carriage movement;
printhead identification means on each printhead comprising patterns of resistors forming part of said 131;~7 5a resistor network providing a unique code for each printhead;
detection means for energizing said patterns of resistors of said printhead identification means for providing electrical signal identifying a specific printhead; and means in said print control system responsive to said electronical signals for initiating operation of said print control system to selectively energize 0 resistors at the nozzles of said specific printhead.
Thermal inkjet printhead identification means, comprising;
a printhead body having at least one ink chamber;
a nozzle plate on said printhead body having 5 nozzles communicating with said chamber;
a resistor network having an ink expulsion resistor at each nozzle;
contact pads in said resistor network and individual circuits connecting individual contact pads 0 to individual resistors; and at least two printhead identification contact pads, each disposed between selected different pairs of said contact pads, and forming part of a printhead identification resistor network including at least two 5 resistors for each printhead identification contact pad.
The utility of this invention in enlarging the printing capabilities of the printer is apparent from the single color/multicolor enlargement in printing scope alone, as discussed above. This invention provides a printer which is capable of reconfiguring its control capabilities according to the code which is sensed when the different types of pens are mounted on the carriage. By this expedient, new and different printing capabilities are provided with the insertion of a new pen. Using a multiprocessor in the printer control system for processing input defined by the pen identity code, reconfigured control potentials are 135b6~
achieved in the selection, for example, of instructions or instruction changes resident in a host controller for the microprocessor.
Brief Description of the Drawinas Figure 1 is a block diagram of a thermal inkjet printer system;
Figure 2 is an exploded perspective view of one type of a thermal inkjet pen which is employable in practicing this invention;
Figure 3 is a schematic fragment of the end of a flexible circuit in Figure 2 which engages the pickup end of a flexible circuit on the printer carriage, showing how the electrical connections are made;
Figure 4 illustrates the layout or the format of the nozzles of a single color recorder head or pen of a type that may be employed in practicing this invention;
Figure 5 illustrates the layout of the nozzle or orifice plate of Figure 2 showing the resistor networks;
Figure 6 shows the actual electrical pad layout of the end of the flexible circuit attached to the detector ~3~
of the printer carriage; and Figure 7 illustrates the logical concept of nine pen identity codes according to one specific embodiment of this invention.
Description of the Preferred Embodiment The block diagram of Figure 1 illustrate one type of printer control system. Such a system comprises a printer (shown here schematically) having a chassis 1 on which a carriage 2 is slidable mounted for movement from one side to the other of paper in a paper advance mechan-ism 3 mounted in the chassis. The paper advance mechanism 3 moves the paper in an orthogonal direction with respect to the carriage. A carriage motor 4 and a paper advance motor 5 drive the carriage and advance the paper under the control of motor drivers 6. Pen drivers 7, supplied with power from a power supply 8 individually energize the ink drop firing resistors of a pen 9 which is secured on the printer carriage 4 by means of a pen attachment mechanism 9a. The ink drop firing resistors are not shown at this point. The system is controlled by a micro-processor 10 which receives data and instructions via an input-output interface 11 coupled to an instruction and data source 12 for the system. Pen identification code 13 on the pen 9, which may be a part of the pen ink drop firing, resistor network or some other identification, is detected and the pen identification by means of the pen identification circuit 14 is used to select one of a plurality of inputs associated with the particular pen at the input source 12, to provide instructions to the microprocessor 10 for controlling that particular pen.
Data for the particular text or graphics to be printed by the pen placed in the printer may be part of the selected input or may be separately programmed via the input-output interface 11 by a data source lS where such provision is convenient.
In instances where pen identification code 13 comprises a part of the resistor network which fires the ~.3l~ r~ ~' droplets from the individual nozzles of the pen, the pen drivers under the control of the microprocessor may interrogate the specific resistor circuits associated with the identification contact pads to obtain the pen identification code. This is done under the control of the microprocessor in which case the microprocessor, interpreting the signals derived from the specific code, provides a pen identification signal which may be coupled to the separate pen identity circuit 14, or used directly, to select one of the inputs, Input l-Input 9, from the instruction source 12, which may also include data for programming the microprocessor in its control of the printhead drivers as well as instructions for controlling the level of input of the power supply 8, where needed, to properly control that particular pen.
Otherwise the microprocessor may look to a code derived from switches from bar codes or light reflective devices, for information identifying the particular head.
One type of head which may be employed in practic-ing this invention is illustrated in the explodedperspective view of Figure 2. This is a thermal inkjet type of pen having a plurality of chambers individually isolated from one another for containing different colors of ink. The pen comprises a pen body 20 having four individual chambers each of which receives a block of foam 21 saturated with ink of a selected color. A back plate 22 seals the body 20 and the individual chambers.
Individual holes 23 in the front face of the pen body 20 provide communication for each pen body chamber with individual openings 24 in a front plate 25 via four openings 26 in a gasket 27 which seals the front plate 25 to the pen body 20 and provides isolated communication of each pen body chamber with a selected one of the openings 24 through the front plate 25. A nozzle plate 30 which fits into a cavity 31 in the front of the front plate 25 is provided with groups of nozzles 32 aligned with the openings 24 in the front plate. Contact pads 33 along the opposite side edges of the nozzle plate 30 provide 13~
connection via circuit traces within the individual resistors at the individual nozzles. These details are shown in Figure 5. The individual contact pads 33 provide a means for selectively connecting electrical energy to the individual resistor circuits. Such connection is accomplished by means of a flexible circuit 35 provided with circuit traces 36 terminating in contact pads along the back of the side edges of the slot in the flexible circuit. The pads are not visibie here. This slot straddles the nozzle plate 30 in assembled position so that the contact pads on the back face of the flexible circuit engage the contact pads 33 on the nozzle plate.
The flexible circuit in assembled position extends beneath the pen body 20 where it is secured by pressure sensitive adhesive 37, or by other means, to the bottom side of the pen body 20.
There are electrical pad connections at both ends of the flexible circuit traces 36. One set of electrical contact pads, as stated above, is on the back side of the flexible circuit 35 on the opposite sides of the slot therein, each of which engages a circuit trace in the flexible circuit. The ends of the circuit traces at the opposite end of the flexible circuit 35 are terminated in contact pads on the bottom side of the flexible circuit 35, as viewed. Figure 3 illustrates such typical connec-tions. Figure 3 is not intended to represent specific connection configurations on the flexible circuit 35, but is intended merely to indicate how these connections are made. A fragment of the flexible circuit 35 is shown on the left in Figure 3 and may typically represent the contact pads on both ends of the flexible circuit 35. A
second flexible circuit 38, also comprising circuit traces and contact pads, represents, for example, a flex-ible circuit end on the printer carriage 2 which engages the end of the flexible circuit 35 beneath the pen body 20, to provide electrical connection between the pen 9 on the carriage 2 and printer drivers 7 (Fig. 1) which are located off the carriage. The contact pads on the 13~'6~9~
g flexible circuit 38 are provided with projecting dimples to provide positive engagement with the contact pads on the confronting section of the flexible circuit 35.
Similar contacts may be provided between the contacts on the flexible circuit 35 and the contact pads 33 on the nozzle plate 30. Such specific connections are illustra-tive and not limiting.
Simplifications in the control system firmware and programming are realized if formating of the nozzle configurations on the different types of pens are similar, for example, nozzle formats on a multicolor pen being similar to the nozzle format on a single color pen.
Figure 4 illustrates the nozzle format for one type of single color pen. The nozzle plate of Figure 4 comprises two columns of nozzles there being 25 nozzles in each column. The nozzles in each column are arranged in staggered groups of 3 as seen. The nozzles in the right column which are odd numbered nozzles 1-49 are displaced vertically as viewed with respect to the nozzles in the left column which are the even numbered nozzles, 2-50, by one-half the distance between the nozzles in the columns.
TABLE I
¦ FIRING I SHIFT OFFSET I TIMING
SEQUENCE I (lPP) I OFFSET (UM) l_____________l___________________l_____________l 0 1 20,46 119,45 1 0.0 1 114,40 113,39 1 2.5 2 18,34 17,33 1 5.5 3 12,28 11,27 1 8.0 4 122,48 121,47 111.0 116,42 115,41 113.5 6 110,36 19,35 116.5 1 7 14,30 13,29 119.0 1 8 124,50 123,49 122.0 9 118,44 117,43 124.5 112,38 111,37 127.5 11 16,32 15,31 130.0 12 1 26 1 25 133.0 .. _ I .
Table I illustrates the firing sequence of the resistors associated with each of the nozzles of Fiqure ,~, . ... . .
13~6~
4. The location of these resistors will be apparent from Figure 5 discussed hereinafter. The resistors on the pen must be fired in a particular order to minimize cross talk. The location of the nozzles is set so that that dots will all be fired in the same vertical column when there is a constant scan or printing velocity. The dot firing sequence and relative nozzle locations in microns for a specific example are specified in Table I. When printing left to right the indicated sequence is used.
When printing right to left the resistors are fired in the reverse sequence.
The nozzle format of Figure 4 is retained in the individual nozzle groups of the printhead 30 as seen in Figure 5. In affect the nozzle column of Figure 4 is divided by 4. Each nozzle group comprises 12 nozzles arrange in 2 columns of 6 having the dot row spacing between corresponding nozzles of respective rows and having the same col~mn spacings as those of the single color pen. Since this multicolor pen has the same contin-uous dot per inch spacing with four color capability as the single color pen all of the single color printer text and graphics control characteristics are utilized. Only firmware and software require color capability. Format-ting is required to provide the dot stagger offset between the nozzle groups. Thus within each nozzle group the ink drop firing sequence is the same as that of the single color pen. Figure 5 illustrates at an enlarged scale the layout of the nozzle plate 30 of Figure 2. Only the openings or the nozzles 32 of the nozzle plate 30 are shown in this Figure 5, since the figure is already highly detailed. These nozzles 32 are shown in their individual locations over the individual resistors R in the respective nozzle groups. The individual circuits or resistors R are connected by circuit traces C to the respective contact pads. The even numbered contact pads 2 through 50 appear on the left side of Figure 5 and the odd numbered contact pads 1 through 49 are shown on the right side of the substrate of Figure 5. The common ~ 3 ~
contact pads for this substrate circuit system appear in the four corners of the substrate.
Only 48 of the 50 nozzles of Figure 4 are needed in developing the nozzle and circuit format of the nozzle plate 30 of Figure 5. In this situation the nozzles 49 and 50 are not used, although they still appear on the nozzle plate as seen. This layout retains the firing sequence of the single color head with respect to the nozzles in the individual color groups. Table II below shows the firing sequence for the nozzles and resistors based upon the development of the nozzle plate of Figure 5 and shows the shift offset required in dot rows or logical print positions in firing the individual r~sis-tors.
TABLE II
-¦ FIRING l l l l I TIMING
I SEQUENCE I O ¦ 10 1 16 1 26 1 OFFSET (UM) l___________l________l________l________l________l____________l O l l 1 20 44 1 1943 1 0 1 l l 1 14 38 1 1337 1 2.5 2 1 8 32 1 7 31 1 1 1 5.5 3 1 2 36 1 1 25 1 1 1 8.0 4 l l 1 22 46 1 2145 1 11.0 l l 1 16 40 1 1~39 1 13.5 6 1 10 36 1 9 35 1 1 1 16.5 7 1 4 28 1 3 27 1 1 1 19.0 8 l l 1 24 48 1 2347 1 22.0 9 l l 1 18 42 1 1741 1 24.5 1 12 36 1 11 35 1 1 1 27.5 11 1 6 30 1 5 29 1 1 1 30.0 12 l l l l 1 33.0 Further and additional details with respect to nozzle formats for multicolor heads may be had by refer-ence to a co-pending Canadian application of C.S. Chan, et al, Serial Number 574,124 filed August 8, 1988 entitled Multi-Chamber Ink Jet Recording Head for Color Use, assigned to the assignee of this invention.
Although the approach described above in format-ting the nozzles in a multicolor head provide simplica-. . ~, ~
13~6~ ¦
tions no~ed above with respect to the control system and its programming, such nozzle formatting is not essential in practicing this invention. One approach to providing individual codes for identifying individual heads is discussed in connection with Figure 5. Similar considera-tions of course apply to other types of heads including resistor substrates 31 having individual circuit pads, circuit traces and resistors for firing the ink drops.
This of course applies to the single color nozzle format of Figure 4 except for the lateral displacement of the nozzles of the individual color groups as seen in Figure 5.
In reference to Figure 5 identification contact pads Il and I2 are provided. The contact pad Il is located between the contact pads 47 and 49 and the contact pad I2 is located between the contact pads 48 and 50. In these positions the contact pad Il may be connected to contact pad 47 or 49 or it may be connected to neither. The contact pad I2 may be connected to the contact pad 48 or the contact pad 50 or it may be connected to neither. The actual physical location of the contact pads at the end of the flexible circuit 35 beneath the pen body 20 may be seen by referring to Figure 6. Here the location of the common contact pads Cl, C2, C3 and C4 at the end of the flexible circuit 35 are shown together with the locations of the individual contact pads l through 50. Note in Figure 6 that the head identity contact pads Il and I2 are located respectively between contact pads 47 and 49 for Il and for I2 between contact pads 48 and 50.
In the circuit configurations described above there are nine possible code identities. These are depicted in Figure 7. Only some of the heads or pens are identified with a particular code to demonstrate the principal. In practice the head or pen needs to be inter-rogated only at the time that a printing operation is initiated. This therefore preferably occurs whether or not a pen is replaced with a different pen. By using this approach, there is certainty that a pen is always properly identified and a pen identification operation will therefore not be overlooked. Since pen identifica-tion interrogation occurs and is terminated prior to the commencement of a printing operation, pen identification in no way interferes with a printing operation. Addition-ally, although the resistor circuits 49 and 50 used in pen identification are not used in a printing operation associated with the specific resistor formatting of Figure 5, this in no way interfers with the pen identifi-cation function or with the printing function which follows.
In this connection it should be observed that the identification contact pads Il and I2 may be located at any convenient location in the contact pad format of Figure 5. Additionally more than one contact pad in each column of contact pads may be used to provide a higher number of identification codes.
While it is convenient to provide pen identifica-tion codes using contact pads and connections formingpart of the resistor circuit format, the means for gener-ating the different identification codes is not neces-sarily a part of the resistor format, but as noted hereinabove may be separate and apart therefrom and need only be located in some con-~enient location on the pen body itself to be sensed electrically, magnetically, optically, or otherwise, in a way providing intelligence via the microprocessor, or otherwise, for selecting the proper printer system input for controlling the pen in the printer.
Claims (6)
1. A dot matrix printer, comprising:
a movable printhead carriage;
a print media;
means for advancing said print media in a direction orthogonal to printhead carriage movement;
single color and multicolor thermal inkjet printheads;
a nozzle plate on each printhead having a plurality of nozzles and means for admitting ink to said nozzles;
each multicolor printhead having a nozzle group for each color of ink in the nozzle plate thereat, each nozzle group having the same nozzle format as the nozzles of a single color printhead but of a lesser number of nozzles than the number of nozzles for the single color of ink of the single color printhead;
means for mounting single color or multicolor printheads on said printhead carriage;
motor means for driving the printhead carriage to move the printhead thereon across said print media;
a resistor network on each printhead having a resistor at each nozzle, which resistor when energized heats and expels ink from the nozzle thereat;
a print control system for selectively energizing resistors of said resistor network of said printhead for printing on said print media during printhead carriage movement;
printhead identification means on each printhead comprising patterns of resistors forming part of said resistor network providing a unique code for each printhead;
detection means for energizing said patterns of resistors of said printhead identification means for providing electrical signal identifying a specific printhead; and means in said print control system responsive to said electronical signals for initiating operation of said print control system to selectively energize resistors at the nozzles of said specific printhead.
a movable printhead carriage;
a print media;
means for advancing said print media in a direction orthogonal to printhead carriage movement;
single color and multicolor thermal inkjet printheads;
a nozzle plate on each printhead having a plurality of nozzles and means for admitting ink to said nozzles;
each multicolor printhead having a nozzle group for each color of ink in the nozzle plate thereat, each nozzle group having the same nozzle format as the nozzles of a single color printhead but of a lesser number of nozzles than the number of nozzles for the single color of ink of the single color printhead;
means for mounting single color or multicolor printheads on said printhead carriage;
motor means for driving the printhead carriage to move the printhead thereon across said print media;
a resistor network on each printhead having a resistor at each nozzle, which resistor when energized heats and expels ink from the nozzle thereat;
a print control system for selectively energizing resistors of said resistor network of said printhead for printing on said print media during printhead carriage movement;
printhead identification means on each printhead comprising patterns of resistors forming part of said resistor network providing a unique code for each printhead;
detection means for energizing said patterns of resistors of said printhead identification means for providing electrical signal identifying a specific printhead; and means in said print control system responsive to said electronical signals for initiating operation of said print control system to selectively energize resistors at the nozzles of said specific printhead.
2. The dot matrix printer according to Claim 1, in which:
said detection means energizes said patterns of resistors of said printhead identification means prior to printing.
said detection means energizes said patterns of resistors of said printhead identification means prior to printing.
3. The dot matrix printer according to Claim 1, in which:
said means in said print control system selects input control for said print control system to provide the required control of said printhead.
said means in said print control system selects input control for said print control system to provide the required control of said printhead.
4. Thermal inkjet printhead identification means, comprising:
a printhead body having at least one ink chamber;
a nozzle plate on said printhead body having nozzles communicating with said chamber;
a resistor network having an ink expulsion resistor at each nozzle;
contact pads in said resistor network and individual circuits connecting individual contact pads to individual resistors; and at least two printhead identification contact pads, each disposed between selected different pairs of said contact pads, and forming part of a printhead identification resistor network including at least two resistors for each printhead identification contact pad.
a printhead body having at least one ink chamber;
a nozzle plate on said printhead body having nozzles communicating with said chamber;
a resistor network having an ink expulsion resistor at each nozzle;
contact pads in said resistor network and individual circuits connecting individual contact pads to individual resistors; and at least two printhead identification contact pads, each disposed between selected different pairs of said contact pads, and forming part of a printhead identification resistor network including at least two resistors for each printhead identification contact pad.
5. The thermal inkjet printhead according to Claim 4, comprising;
means for coupling electrical energy at different times to each resistor at each printhead identification contact pad to determine by the resulting voltage response, if an electrical connection exists between a printhead identification resistor and the associated printhead identification contact pad.
means for coupling electrical energy at different times to each resistor at each printhead identification contact pad to determine by the resulting voltage response, if an electrical connection exists between a printhead identification resistor and the associated printhead identification contact pad.
6. The thermal inkjet printhead according to Claim 5, comprising;
means for utilizing said voltage responses to provide a code identifying said thermal inkjet printhead.
means for utilizing said voltage responses to provide a code identifying said thermal inkjet printhead.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/116,093 US4872027A (en) | 1987-11-03 | 1987-11-03 | Printer having identifiable interchangeable heads |
| US116,093 | 1987-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1306897C true CA1306897C (en) | 1992-09-01 |
Family
ID=22365191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000574125A Expired - Lifetime CA1306897C (en) | 1987-11-03 | 1988-08-08 | Printer having identifiable interchangeable recording heads or pens |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4872027A (en) |
| EP (1) | EP0315417B1 (en) |
| JP (1) | JP2807708B2 (en) |
| KR (1) | KR930001244B1 (en) |
| CA (1) | CA1306897C (en) |
| DE (1) | DE3853403T2 (en) |
| HK (1) | HK7396A (en) |
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-
1987
- 1987-11-03 US US07/116,093 patent/US4872027A/en not_active Expired - Lifetime
-
1988
- 1988-08-08 CA CA000574125A patent/CA1306897C/en not_active Expired - Lifetime
- 1988-11-01 EP EP88310277A patent/EP0315417B1/en not_active Expired - Lifetime
- 1988-11-01 DE DE3853403T patent/DE3853403T2/en not_active Expired - Lifetime
- 1988-11-02 JP JP63278502A patent/JP2807708B2/en not_active Expired - Fee Related
- 1988-11-02 KR KR1019880014365A patent/KR930001244B1/en not_active IP Right Cessation
-
1996
- 1996-01-18 HK HK7396A patent/HK7396A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| HK7396A (en) | 1996-01-26 |
| DE3853403D1 (en) | 1995-04-27 |
| DE3853403T2 (en) | 1995-07-27 |
| EP0315417B1 (en) | 1995-03-22 |
| EP0315417A3 (en) | 1991-10-16 |
| KR900008410A (en) | 1990-06-04 |
| KR930001244B1 (en) | 1993-02-22 |
| JPH02513A (en) | 1990-01-05 |
| JP2807708B2 (en) | 1998-10-08 |
| EP0315417A2 (en) | 1989-05-10 |
| US4872027A (en) | 1989-10-03 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
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