|Número de publicación||USRE38957 E1|
|Tipo de publicación||Concesión|
|Número de solicitud||US 10/647,821|
|Fecha de publicación||31 Ene 2006|
|Fecha de presentación||25 Ago 2003|
|Fecha de prioridad||13 Sep 1999|
|Número de publicación||10647821, 647821, US RE38957 E1, US RE38957E1, US-E1-RE38957, USRE38957 E1, USRE38957E1|
|Inventores||Thomas Laussermair, Abhijit Bhattacharya, Michael Schmitt, Tony Ribeiro, Frank Lorenz, Leon T. Dietz|
|Cesionario original||Oce Printing Systems Gmbh|
|Exportar cita||BiBTeX, EndNote, RefMan|
|Citas de patentes (29), Otras citas (1), Citada por (21), Clasificaciones (6), Eventos legales (3)|
|Enlaces externos: USPTO, Cesión de USPTO, Espacenet|
An electrophotographic printing system adapted to use various developer stations for different kinds of toner has been described by the Applicants of the present application already in WO-A-99/24877 (U.S. Ser. No. 09/254,292, now U.S. Pat. No. 6,236,816).
This application is a continuation-in-part of previous application Ser. No. 09/394,546 filed Sep. 13, 1999 now U.S. Pat. No. 6,137,967, for “Document Verification And Tracking System For Printed Material”.
This invention relates to printing systems. In particular, the invention relates to a printing system which is adapted to produce printed documents with high speed, whereby the printing data are provided from a variable print data source and the printing system is a kind of production line.
In today's high speed printing environment the assurance of document verification and process control is increasing. However, according to a further demand, the printing speed should not be significantly reduced by any inspection techniques. The speed of a single high-speed printer normally exceeds 50 DIN A 4 pages per minute. Its speed may even be some hundreds up to a thousand DIN A 4 pages (images) per minute and—by further development of high speed variable data printers—may even increase to still higher printing speeds.
To further increase the printing speed of variable data printing lines, it has been proposed to perform printing of documents over two or more printers. In particular, this may apply to printers printing on fanfold recording carriers, whereby the carrier already printed by a first printer is subsequently fed to a second printer for a second printing process. The first printer may print onto a first side (front side) of the printing carrier while the second printer may print onto the reverse side of the carrier. Alternatively, the first and second printers may print on the same side of the carrier, but the printers may be loaded with different inks. In particular, electrographic printers such as electrostatographic or magnetographic printers may utilize different toners such as standard optical black toner, colored toner or magnetic ink characters readable toner, which is also known in the art as MICR toner.
A further electrophotographic printer especially adapted for printing on a fanfold recording carrier is described in U.S. Pat. No. 5,778,297.
In many presently available printing systems document verification is not performed at all. However, there have been proposed printing systems with integrated qualification or inspection systems for the printed images. Such a system is described in U.S. Pat. No. 5,235,652. This system comprises a set of measurement modules which have sensors for forming various inspection functions such as image location and spacing measurements; image print contrast/intensity measurement; image skew angle measurements; image stroke with measurement; image edge variation measurement; image void measurement; image size and dimension measurement; image extraneous ink measurement and image curvature measurement.
If such a document verification system is to be introduced into a production printing line, various technical problems occur.
An object of the invention is to provide a system for inspecting printed documents comprising optical and magnetic information. More particularly, the information may be printed on a continuous web-shaped recording carrier. Still more particularly, the carrier may be fanfold paper.
According to a first aspect of the invention there is provided a method or a system for printing at least one of optical and magnetic information onto a continuous web-shaped recording carrier. The carrier comprises at least one of an optical recording zone and a magnetic recording zone. Magnetic information is printed by a printing station on the recording carrier using magnetic ink character readable toner (MICR toner). Optical information printed by the printing station is being tested by an optical inspection system and magnetic readable information printed by the printing station is being tested by a magnetic inspection system. Both the optical inspection system and the magnetic inspection system are located in-line to the printing line. In addition to at least one printing device, the printing line may comprise additional devices such as printer preprocessing unwinders or print postprocessing stackers, folders or cutters.
When a continuous web of recording material is used, such as paper unwound from a roll or fanfold paper input from a stack, the in-line inspection systems are located at any place of the printing line along the web, where the inspection system may be able to inspect information, which is printed on the web.
In a preferred embodiment of invention, the testing step is controlled by print stops of the printing station. In a still more preferred embodiment of the invention, the magnetic test equipment is mounted at an output zone of a printing device and in particular it is mounted at a stacker. Testing may comprise print quality, e.g. optical density or strength of magnetic field, as well as a print contents test.
According to another aspect of the invention, a system controller is provided, by which printing operation is selectively stopped for verification of recorded magnetic information on the carrier.
According to a still another object of the invention, three different scanning systems, in particular an optical camera system, a bar code scanning system and a reading device for magnetic ink are operating in combination. Signals of these three different scanning systems are captured by a data acquisition system and the data are processed by a data management system. According to this aspect of the invention, print quality inspection, document verification and document tracking may be performed. Print quality inspection may comprise, but is not limited to, optical density measurement, magnetic character signal level and signal uniformity across the document. Document verification may comprise but is not limited to comparison between predetermined data to be printed and data captured by the inspection system form the printed document. For that purpose an electronic comparison device may be connected to both an electronic print data source and the document test equipment.
According to the latter aspect of the invention, three different technologies are used to check or verify printed documents in a document production line. The first technology might comprise a vision system such as a CCD camera for checking optical information on the documents. The second technology may comprise a laser scanner for checking bar code information on the documents. The third technology may comprise a magnetic ink reading device to check magnetically coded information printed on the documents. Any information reads from the documents is processed through an intelligent data acquisition system. An overall management system will use such data to allow high level client applications to display information, to support decision making based on them and to track documents passing through the printing system.
In particular, the invention is suitable for use in document printing lines which print magnetic information onto the documents. The printing line may comprise a printing device as disclosed in WO-A-99/24877, corresponding to U.S. Ser. No. 09/254,292. The printing device described therein is an electrophotographic printing device which prints magnetic ink character recognition toner (MICR toner) on documents. This US patent application is hereby incorporated by reference into the present disclosure.
According to a still further object of the invention, document tracking is performed. Document tracking implies the precise monitoring of the position of a particular document throughout the production line at any given time. Various checkpoints are arranged along a printing line for printing documents. At each checkpoint any document passing the checkpoint will be detected and its position and actual time are stored in a document tracking managing system. Thereby, the actual document position may be monitored at any given time.
In another aspect of the invention, a stand-alone box separate from the printer is provided for housing the MICR reader, bar code scanner, and CCD camera.
Workflow management computer 8 is connected to a data base 13, where specific production relevant data of the printing process are stored for further data processing. Relevant data such as location of specific documents, job numbers and statistical data may be stored in data base 13. Once the winding roll 4 is full, the roll will be docked to a post-processing device 14. Within this device, the documents are checked at a third checkpoint 7b by an address reader 16. Thereby, computer 8 receives information as to which document is currently being processed in the post-processing device 14. Within device 14 the printed fanfold paper web 5 is cut into individual single sheets and the printed document 17 is being folded and inserted into envelops. The completed envelopes are forwarded to a fourth checkpoint 7c, where the address printed on the envelope are being checked. At checkpoint 7c addressed data are again forwarded by address reader 300 to management computer 8 for control of the document production process, i.e. for the workflow process. All of the checkpoints 7, 7a, 7b and 7c and the test equipment located at these checkpoints are arranged along the transport path of the paper web 5, i.e. they are located in-line with the printing line 1. In a slightly different embodiment, winding roll 4 is not used. Instead, the printing web may directly be fed from printer's 2 output to print postprocessing device 14 or through a paper buffer 33, which may buffer some thousand pages of documents.
All three different inspection systems, i.e. CCD camera 9, laser scanning bar code reader 6 and MICR reader 20 have respective electronic equipment, which receives signals and processes these signals for further prosecution to a data acquisition system 24. That is, vision system 27 performs image processing of the data received from the digital camera 9, bar code system decoder 128 processes signals received from the bar code laser scanner 6 and MICR system decoder 29 processes any data received from MICR reader 20. The data acquisition system 24 is a multi-threaded software program capable of reading and passing data sent by various scanning systems (camera, bar code, MICR) and storing the data into either a flat file or a data base in a form suitable for further processing. Dataline 125 may be part of local area network 12 or may be a separate serial line, e.g. RS232, or any other commonly used data line. The data processed in the data acquisition system 24 may be stored in a memory 26 and further processed by the management system, which may be the workflow management computer 8.
The bar code scanner 6 is a high speed laser bar code scanner which is able to scan in one-dimensional fashion as well as a two-dimensional bar code. Within the total printing line, different bar code scanners can be mounted at different locations. A first bar code scanner is mounted in-line with the printer and a second bar code scanner is located at any location of the production line following the electrophotographic printer.
As shown in
Once a digital image of the printed paper has been acquired, image processing can be performed by a software running on the vision system controller (VIS) 27. Image processing steps may include but are not limited to:
The vision system may also detect any bar code printed on the documents and use such information for tracking, logo verification. For that purpose, an image within a region of interest (ROI) is compared with a predetermined pattern. To perform these image processing steps, data for comparison may be provided by an external source. Respective data may also be provided from printer basic control unit 51. Alternatively, if one and the same information is repeatedly to be printed, respective data may be generated by a teach-in process, whereby the regularly printed information is stored in a memory within the vision system controller 27.
The results of these measurements are sent to the data acquisition system 24. In addition, the vision system controller 27 may be configured to stop the print line when certain definable criteria are met, e.g. if threshold values are exceeded or data trends are negative.
Bar Code Reading System
The bar code reading system may be utilized by a state-of-the-art laser scanner system which is capable of reading at least one-dimensional bar codes or even two-dimensional bar codes. Data obtained by the bar code reader system (BSC) 128 are passed to the data acquisition system SDAC 24, which processes the data and finally sends the processed data to management computer 8. The bar code may be mounted in-line with the printer 2 as shown in
MICR Reading System To inspect information written with magnetic ink character reading (MICR) toner, the MICR reading system will provide the capability of proof-reading the MICR line on a document. Since in many printing applications MICR information is printed in a direction transverse to the transport direction of fanfold recording carrier web, the web has to be stopped to perform a MICR reading process. During the reading process, the MICR reading system is moved transversely across the printing web. The recording web and thus the document to be checked stand still during the MICR reading process.
The MICR reading system is in-line with the printing line (printing system), i.e. reading can be performed directly on the recording web within its path through the printing line. Thus, it is not necessary to cut a sample out of the web for proof-reading any MICR information. Thus, the MICR reading process can be performed at any time when the printing web within the printer is stopped. Whenever the printer is stopped manually or automatically (e.g. for a clean stop or for a pre/post-stop), the paper will be advanced or reversed automatically to a defined position so that the MICR read head 20 is aligned on the printed MICR line on the document. Afterwards, the proof-reading scan goes transversely across the paper or documents. The MICR reading results will be provided by the MICR reading system controller 29 and may be displayed by a suitable display which is connected to the controller 29. Respective data are sent to the data acquisition system 24 and further processed by printer basic unit control 51 or user interface control 52.
Data Acquisition System
The data acquisition system 24 accepts data of the different test equipment (optical, bar code, MICR) and may send these data either to overall system computer 8 via a port and dataline (RS 232) or via a network (LAN). Alternatively or in addition to sending it may store the information in a flat file or in a data base (e.g. SQL).
Management system Management system computer 8 stores a SQL data base. Any status information of the printed documents which are received from the data acquisition system are stored and updated in the SQL data base. The data are processed within the computer 8 by software which tracks the location (whereabouts) of any document which is currently processed by the printing production line 1. Computer 8 may comprise a graphical display for displaying status messages, document locations etc. Addition functions such as reprinting documents or creating alerts can be performed by management system computer 8.
The multi-functional printer device is composed of a central printer module 31 with deflection unit 28 adapted thereto and an accompanying, mobile stacker unit 22, as well as of a control module 32 with operating surface. The printer module 31 is constructed as a distortion-stable torsion box. To this end, two lateral sheet steel billets extending to the floor are connected to one another via intervening traverse elements 134 in the form of extruded aluminum profiles to form a torsionally rigid supporting framework. This serves, among other things, for the acceptance of the core electrophotographic units 11, namely an intermediate carrier unit (photoconductive drum) generating the toner images, charging unit, character generator, developer station, transfer printing station, cleaning station, discharge unit and fixing station 18. The individual units are thereby suspended in the lateral billets, as a result whereof a high-precision allocation of the units to one another is achieved. The risk of paper running faults due to misalignment is thereby reduced during operation of the printer device. Repeated readjustment is thus eliminated. The allocation stability is further enhanced in that stable unit sub-modules are formed via the cross-bracings 134 allocated to the individual units. For example, in the form of a fixer module 18, a photoconductor module, a region for the supply stack 23 and a region for the acceptance of the device electronics 35.
For forming a service-friendly, compact printer structure, the individual units are arranged such within the printer module such that, on the one hand, the throughput path of the paper web 10 becomes optimally short and, on the other hand, the heat required for the fixing process does not negatively influence the units or, respectively, the paper web. For this purpose, the fixing station 18 is arranged in the uppermost region of the printer module above the unit (intermediate carrier 11) that generates the toner images. The heat arising during fixing, including the substances exhaled by the paper, are immediately extracted via a vapor extraction hood 36. The paper web traverses the fixing station 18 nearly horizontally and leaves the printer module via a paper output channel 37. A return channel 38 that likewise proceeds horizontally is located under the fixing station for returning the narrow recording medium that has been deflected and/or turned over via the deflection unit 28. In a feed region to the photoconductor module, the return channel 38 is in communication with a delivery channel 39 for recording media of different tape widths. The recording medium 10 is supplied to the photoconductor module via this delivery channel 39 proceeding from a supply region, for example the supply stack 23. Further, external delivery channels 40, 41 that 40 cut through the primer module or lead 41 around the printer module are also provided in order to be able to supply the recording medium to the photoconductor module proceeding from an external supply stack. The entire paper path through return channel 38, photoconductor module and fixing station 18 is designed such that an optimally short paper running distance derives and such that the recording medium is supplied approximately horizontally to the deflection unit 28 and passes therethrough roughly horizontally. The following cooling path thus becomes arbitrarily large and can be freely designed. A complemented production of cooling air is thus eliminated.
Conveyed by a conveyor unit, the paper web leaves the transfer printing station steeply upward, is deflected by 60-90° via looper 42 and by up to 45° more via a saddle 43, and passes through the fixing drums 19,222 nearly horizontally. Since the minimum wrap angles of looper 42 and saddle 43 are functionally predetermined, it is beneficial for achieving such a horizontal feed attitude when the transfer printing station is arranged roughly in the middle above the photoconductive drum 11.
The deflection unit 28 is likewise fashioned as a module that can be coupled to the paper output channel 37 and the return channel 38 of the printer module via releasable fastening unit, for example screw-type or soap-in closures. It contains guide rollers 21 and, as a separate structural unit, a turn-over unit 30. This turn-over unit 30 can likewise be detachably secured on carriers of the deflection unit and, for example, can be pulled out via hinges. It is freely accessible, so that disturbances in paper running can be eliminated without parting the paper web.
The deflection unit 28 also contains a manually or motor controllable shunt 44 via which the recording medium 10, proceeding from the paper output channel, is supplied via the deflection unit to the return channel 38 in a first operating mode of the printer device for multiple printing of the narrow recording medium 10, and, after another pass through the unit that generates toner images, is supplied to the mobile stacker unit 22 via an output channel 45 allocated to the deflection unit. The mobile stacker unit 22 provided with rollers 46 and/or the sidewall of the printer module can comprise fit elements that enable a positionally exact seating of the stacker unit 22 against the printer module. The deflection unit 28 can likewise be part of the stacker unit 22. A MICR reader 20 is mounted on a plate at the stacker 22, which will be described in more detail later with reference to FIG. 6.
When the paper web stops at a top-of-page position, the MICR head carrier 68 cycles across the continuous form on demand, reading all magnetically coded characters of the respective documents. Within the electronic device 60 the ANSI (American National Standards Institute) conformance of the read characters is proved and reported to serial data acquisition system 24. Given ANSI compliance of the MICR print, the software in the management system computer 8 will generate a predominantly green signal-strength bar graph display, recommending to the operator an immediate resumption of printing. A non-compliance test result will generate a yellow or red bar graph display and allow further screens to be accessed to identify the nature of the MICR print problem. In either case, results can be automatically stored, reports printed, and ANSCII MICR line data saved for production control purposes.
According to the invention, the printing device may use a changeable developer station, whereby a quick change between a first developer station and a second developer station can be performed. While the first developer station may use optical readable toner, the second developer station may use a MICR toner. Such a printing station is described in WO-A-99/24877, the disclosure of which is hereby also incorporated by reference to the present disclosure.
The invention provides a comfortable printing system comprising in-line test equipment for character recognition both optical and magnetical as well as bar code scanning. With such a system document verification and document-tracking in a printing production line can be performed to enhance print quality assurance. The embodiment as described comprises a magnetic head mounted to a printer in the region of a stacker. Of course, such magnetic reader carrier may be utilized at any other position within a printing line, in which precise stop position of the paper may be utilized. Alternative embodiments may provide a magnetic read head in a buffer whereby the recording web may be stopped for reading while printing is continued. During the test steps, newly printed material would be fed into the buffer thereby increasing the amount of carrier within the buffer.
In still further embodiments, a magnetic read head may be fixed to a carrier and the paper being advanced across the read head. The magnetic attributes of the printed density marking blocks at the edge of the continuous form would then be detected while the form would be in motion. According to such embodiments, a magnetic read head assembly may be fixed in position in the stacker area of a printer or in a turn-bar mechanism of a printer.
In the further embodiment of
Thus, the stand-alone box of
As shown in another embodiment in
By providing the inspection equipment twice, that is at the top and bottom of the fanfold paper tray, duplex printer paper may be scanned in one pass.
To synchronize print stops of the printer, marks can be printed regularly (for instance every 10, 50, or 1000 pages) on the paper to signal a position. A respective entry to the control computer 92 is made. The marks may be used for precise positioning of the paper at the verification equipment within the stand-alone box 83.
The mark together with the paper buffer is positioned before the stand-alone box as shown in FIG. 8. This allows holding a position while the verifying equipment reads the document without slowing down the printer—that is it would be possible that the printer starts again, before the precise positioning and verification steps have been finished. According to
Other verification technology such as ultrasound verification, or IR light verification to detect mechanical paper damage, can be added to the stand-alone box.
There are many advantages to the stand-alone box system shown in
Although various minor modifications might be suggested by those skilled in the art, it should be understood that our wish to embody within the scope of the patent warranted hereon all such modifications as reasonably and properly come with the scope of our contribution to the art.
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|20 May 2009||FPAY||Fee payment|
Year of fee payment: 8
|5 Jul 2013||REMI||Maintenance fee reminder mailed|
|27 Nov 2013||LAPS||Lapse for failure to pay maintenance fees|