US3252411A - Method and apparatus for continuously maintaining a layer of coating material on a screen during printing and for controlling the viscosity of the coating material - Google Patents
Method and apparatus for continuously maintaining a layer of coating material on a screen during printing and for controlling the viscosity of the coating material Download PDFInfo
- Publication number
- US3252411A US3252411A US398236A US39823664A US3252411A US 3252411 A US3252411 A US 3252411A US 398236 A US398236 A US 398236A US 39823664 A US39823664 A US 39823664A US 3252411 A US3252411 A US 3252411A
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- United States
- Prior art keywords
- screen
- stencil
- coating material
- cylinder
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/44—Squeegees or doctors
- B41F15/46—Squeegees or doctors with two or more operative parts
Definitions
- the present invention relates to screen stencilling methods and machines by means of which coating ma-' terials such as pigmented inks, adhesives and functional deposits may be forced through a screen stencil onto sheets of paper or other stock for making posters, decalcomania or other products, incorporating graphic design, functional deposits and coatings.
- coating ma-' terials such as pigmented inks, adhesives and functional deposits may be forced through a screen stencil onto sheets of paper or other stock for making posters, decalcomania or other products, incorporating graphic design, functional deposits and coatings.
- the present invention overcomes the above limitation and makes possible the use of quick-drying coating materials so that the sheets can be piled one upon another immediately after the screening of them. Also, the present invention provides for constant control of the viscosity and the solvent content of the coating materials being used. Therefore, screen prints made by the present process are all of uniform color intensity. This is accomplished by continuously recirculating the coating material through an external viscosity control device while the machine continues in operation. Such a viscosity control is especially important with ceramic, transparent, and halftone printing inks.
- the stencil is flow-coated immediately after and adjacent to the print-01f and is, therefore, supported by the cylinder, thus no depressed crown or coating is effected.
- the present invention provides for flow-coating the screen with coating material immediately after the print-0d and in close proximity to the cylinder and the squeegee so that substantially all of the screen is coated with a relatively heavy layer of coating material at all times, thus preventing any drying out of coating material in the open mesh of the stencil.
- Another advantage is that in flow coating immediately after and adjacent to the squeegee and cylinder, the time lapse of ink layer on the stencil is progressively the same, where-as in the older system flow coating was done on the return stroke. Thus, the beginning of the flow coat had a greater time to seep into the stencil and displace air in the mesh and this portion of the stencil consequently produced a more solid print in the finish of the print-oil stroke.
- a still further advantage of the present invention lies in a provision for continuously removing the coating material from the stencil frame for reconditioning, thus eliminating any pile up of material within the stencil frame and making possible the use of a shorter
- the invention makes possible 3 screen and screen frame (again see FIG. 6 of Patent No. 2,606,492), thus enabling a shorter stroke of the machine, faster operation and increased-production.
- FIG. 1 is a sectional view illustrating screen stencilling apparatus in the printing phase of operation for screen printing onto sheet stock
- FIG. 3 illustrates the application of the new method in the screen printing of continuous web stock
- FIG. 4 is an enlarged sectional view which illustrates certain aspects of the apparatus of the previous figures in greater detail.
- FIGS. 1 and 2 of the present drawing compare with FIGS. 6 and 7 of that patent by way of contrasting the new mode of operation with the former mode.
- a stock-supporting cylinder 9 is mounted for I reciprocating rotary movement through print and nonprint strokes, the print stroke being in a counter-clockwise direction as indicated in FIG. 1, and the non-print stroke being in a clockwise direction as indicated in FIG. 2.
- Sheet stock, designated 10 is fed to the cylinder 9 over a feedboard indicated at 11 for processing at the print-ofi station at the top of the cylinder, and after it has been processed the stock is carried away from the cylinder over a delivery board indicated at 12.
- a screen stencil 13 of fine mesh silk or wire secured to the underside of a stencil frame 14, is mounted above the cylinder 9 for reciprocating linear movement through forward print strokes as indicated in FIG. 1 and through non-print return strokes as indicate in FIG. 2.
- the screen stencil 13 is also mounted for reciprocating vertical displacement toward the cylinder 9 at the beginning of the print stroke and away from the cylinder 9 at the end of the print stroke.
- a combination squeegee and flow-coater assembly generally designated 15, is mounted above the screen stencil 13 for vertical reciprocating movements toward the stencil 13 and cylinder 9 at the beginning of each print stroke and away from the stencil and cylinder at the end of each print stroke.
- This combination squeegee and flow-coater 15, which is shown in detail in FIG. 4, comprises a fountain flow-coat reservoir 16 having a rubber or plastic spreader blade 17 at its lower end, and a take-up reservoir,
- a composite viscosity control and recirculating device is indicated at 20, by which coating material is continuously and automatically recirculated from the take-up reservoir 18 of flow-coater 15 to the reservoir 16 thereof.
- the device 20 includes a hydraulic pump means which is driven by a motor 26 in a known manner and an automatic viscosity control apparatus 27 of the nature disclosed in US. Patent Nos. 2,254,575 and 2,773,507.
- Pump 25 operates to draw excess coating material from take-up reservoir 18 through a take-up conduit 21. This material is then pumped into the viscosity control 27, where it is automatically tested for viscosity and reconditioned by the addtion of needed amounts of new solvent material, supplied through a solvent supply conduit 22.
- the fountain flow-coater 15 has a gate means 24 at the lower end of reservoir 16 which operates to close this reservoir when the gate means is in its upper position and to open the reservoir when it is in its lower postion.
- the open (lower) position is shown by the solid lines in the figure, and the closed (upper) position is shown in phantom.
- Gate 24 is moved from one of its positions to the other by an actuating lever 28 which is pivotally supported at 29, where it passes through the outer wall of the fiow-coater structure.
- the inner end of lever 28 is loosely coupled with the gate 24, while the outer end of the lever is loosely coupled to a fixed external pivot point 30.
- Sheets of stock 10 are intermittently fed to the stocksupporting cylinder 9 over the feedboard 11 at the beginning of each print stroke, and removed after the print-off over delivery board 12.
- Conventional conveyor tapes may be associated with the feed-board 11 and delivery board 12, and suitable grippers and strippers such as those shown in Patent No. 2,606,492 may be associated with the cylinder 9.
- the stencil screen 13 is lowered into contact with the sheet 10, and the squeegee and flow-coater assembly 15 is lowered so that the squeegee blad 19 contacts the screen 13 to effect tangential line contact between the sqeegee blade 19, screen 13, stock 10 and cylinder 9. Further, lowering of the flow-coater 15 serves to open gate 24 and reservoir 16, in the manner previously described.
- cylinder 9 rotates counterclockwise, and the screen stencil 13 and stock sheet 10 together move simultaneously to the left as seen in FIG. 1.
- the left-hand portion of the screen is progressively recoated with an even layer of coating material from reservoir 16 closely following and concurrently with the print-off.
- the excess of coating material on the right-hand portion of the screen is wiped off by squeegee 19 and progressively taken up through the take-up conduit 21 by pump 25.
- This excess coating material is then fed into the viscosity control device 27, where it is automatically recirculated and reconditioned with solvent material as required.
- the reconditioned solvent is returned to the flow-coat reservoir 16 through the delivery conduit 23 by the viscosity control device.
- the screen stencil 13 is moved upwardly a short distance away from the cylinder 9. Squeegee 19 and flow-coater assembly 15 are moved farther upwardly and away from both the cylinder 9 and the screen stencil 13, as illustrated in FIG. 2, thereby closing gate 24 and preventing any further coating material from leaving reservoir 16.
- the screen stencil is then returned through its non-print stroke to the right (FIG. 2) to its starting position, while the cylinder 9 is simultaneously moved clockwise to its startin position.
- FIG. 3 illustrates the screen printing of continuous web stock 10a, such as wall paper, wrapping paper, upholstery covering materials and the like.
- the mode of operation is generally the same as that previously described, except that the cylinder 9a always moves in the same (counter-clockwise) direction with an intermittent motion which advances the web to the left during the print-off and halts the movement of the web during the non-print stroke of the stencil.
- a screen stencilling method comprising the steps of coating one side of a stencil screen from end to end with a layer of coating material, progressively printing off at least some of said coating material through said screen and onto stock positioned adjacent the other side of the screen, and progressively recoating said one side of the screen from end to end with another layer of coating material during said printing-off such that substantially all of said one side of the screen is coated with a layer of coating material at all times during the repetition of said steps.
- a screen stencilling method including the additional steps of removing from said screen during the said print-ofi step substantially all of said coating material in excess of that actually printed olf, reconditioning removed coating material having altered characteristics due to exposure to a controlled viscosity, and recoating said one side of the screen with said reconditioned coating material.
- a screen stencilling method comprising the steps of feeding stock over a rotatably mounted cylinder, moving a fiat stencil screen into contact with the cylinder-supported part of said stock, moving a squeegee into contact with the stencil screen along the screens line of tangency with the cylinder-supported stock and at the same time moving a fountain flow-coater into flow-coating position relative to the screen and in close proximity to said squeegee, imparting rotary movement to said cylinder and linear movement to said stencil whereby the squeegee progressively prints off coating material through the screen and onto said stock while concurrently therewith the fountain flow-coater progressively recoats the stencil screen, whereby substantially all of said screen is coated with a layer of coating material at all times during the repetition of said steps.
- a screen stencilling method including the additional steps of moving the stencil away from the cylinder and moving the squeegee and the fountain flow-coater away from the cylinder and the stencil at the conclusion of the print-off, and then returning the stencil to its starting position.
- a screen stencilling method including the additional steps of removing excess coating material from the screen during the print-off, recirculating said excess material through a viscosity control device for reconditioning, and then returning the reconditioned material to said fountain flow-coater.
- Screen stencilling apparatus comprising a stocksupport and a screen stencil adjacent said stock-support, a squeegee means adjacent the stencil movable relative thereto for printing off coating material through the stencil and onto stock supported on said stock-support, means for taking up from said stencil coating material in excess of that printed off through said stencil and which accumulates in front of the said squeegee means, means operatively associated with said taking-up means for reconditioning the said coating material'which has been taken up by adjusting its viscosity to a predetermined value, and means for recoating said screen stencil with said reconditioned coating material in close proximity to said squeegee means during the said printing off.
- Screen stencilling apparatus comprising a rotatable stock-supporting cylinder, a stencil means having a generally flat screen stencil mounted above said cylinder for forward and returning reciprocating linear movements relative to the cylinder through print and non-print strokes,
- said stencil means providing reciprocating vertical displacement of said screen stencil toward and away from said cylinder, a squeegee means having a generally flat squeegee blade mounted for vertical reciprocating movements toward and away from the cylinder, said stencil means and said squeegee means arranged such that at the beginning of the said forward screen stencil movement the screen stencil and the squeegee blade are moved into tangential line contact with stock positioned upon and supported by said cylinder to print off coating material through said screen stencil and onto said stock, and said stencil means and squeegee means arranged such that said screen stencil and squeegee blade are moved out of contact with the cylinder-supported stock at the end of I said forward screen stencil movement, and means for continuously depositing coating material upon said screen stencil in proximity with said squeegee and on that portion of said screen stencil already printed off by said squeegee as said screen stencil moves under said squeegee during its said forward print-stroke, such that said printed-off portion of said stencil is continuously coated with said coating
- Screen stencilling apparatus comprising a rotatable stock-supporting cylinder, a stencil means having a generally flat screen stencil mounted above said cylinder for forward and returning reciprocating linear movements relative to the cylinder through print and non-print strokes, said stencil means providing reciprocating ver tical displacement of said screen stencil toward and away from said cylinder, a squeegee means having a generally flat squeegee blade mounted for vertical reciprocating movements toward and away from the cylinder, said stencil means and said squeegee means arranged such that at the beginning of said forward screen stencil movement the screen stencil and the squeegee blade are moved into tangential line contact with stock positioned upon and supported 'by said cylinder to print off coating material through said screen stencil and onto said stock and said stencil means and squeegee means arranged such that said stencil and squeegee blade are moved out of contact with the cylinder-supported stock at the end of said forward screen stencil movement, and viscosity control means for taking up coating material in excess of that printed off through said
- Screen stencilling apparatus comprising: a rotatable stock-supporting cylinder; a stencil means having a fiat screen stencil mounted above said cylinder for forward and returning reciprocating linear movements relative to the cylinder through print and non-print strokes; said stencil means providing reciprocating vertical displacement of said screen stencil toward and away from said cylinder; at squeegee and flow-coater assembly, including a squeegee blade, a take-up reservoir positioned in advance of said blade, and a fountain flow-coater reservoir with a spreader blade rearwardly thereof; means mounting said squeegee and flow-coater assembly for vertical reciprocating movements toward and away from the cylinder and the said screen stencil such that at the beginning of the 7 8 away from said cylinder and screen stencil upon the com- References Cited by the Examiner pletion of said print stroke.
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Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US398236A US3252411A (en) | 1964-09-22 | 1964-09-22 | Method and apparatus for continuously maintaining a layer of coating material on a screen during printing and for controlling the viscosity of the coating material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US398236A US3252411A (en) | 1964-09-22 | 1964-09-22 | Method and apparatus for continuously maintaining a layer of coating material on a screen during printing and for controlling the viscosity of the coating material |
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US3252411A true US3252411A (en) | 1966-05-24 |
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US398236A Expired - Lifetime US3252411A (en) | 1964-09-22 | 1964-09-22 | Method and apparatus for continuously maintaining a layer of coating material on a screen during printing and for controlling the viscosity of the coating material |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3511213A (en) * | 1964-12-22 | 1970-05-12 | Mccorquodale Colour Display | Application of liquid colours to paper card or other smooth surfaces |
US3577914A (en) * | 1969-11-28 | 1971-05-11 | Heinrich Ronge | Screen printing machine employing a reciprocating printing and feed plate |
DE2016377A1 (en) * | 1970-04-06 | 1971-10-28 | Schnellpressenfabrik Frankenthal Albert & Cie, AG, 6710 Frankenthal | Screen printing machine |
US3779161A (en) * | 1970-09-28 | 1973-12-18 | Kurashiki Boseki Kk | Screen printer with ink level sensing and control |
US3919967A (en) * | 1974-04-22 | 1975-11-18 | Automation Dev And Engineering | Traversing printer |
US3973491A (en) * | 1974-10-29 | 1976-08-10 | James A. Black | Flood coater and squeegee with viscosity sensing and control |
US4051777A (en) * | 1974-10-29 | 1977-10-04 | James A. Black | Stencilling apparatus with flow through print and flow action |
DE2744818A1 (en) * | 1976-10-07 | 1978-04-13 | Black James | WIPER DEVICE |
US4106435A (en) * | 1974-03-19 | 1978-08-15 | Hilti Aktiengesellschaft | Apparatus for marking metal |
WO1980001151A1 (en) * | 1978-12-11 | 1980-06-12 | G Warner | Emulsion lithographic printing system |
US4307662A (en) * | 1976-09-25 | 1981-12-29 | Mathias Mitter | Apparatus for printing on webs |
US4388864A (en) * | 1978-12-11 | 1983-06-21 | Warner "Autolitho" Corporation | Lithographic dampening system |
EP0086941A1 (en) * | 1982-02-18 | 1983-08-31 | Gerhard Klemm | Method and device for inking a flat screen |
JPS59185651A (en) * | 1983-04-07 | 1984-10-22 | Matsushita Electric Ind Co Ltd | Screen printer |
US4485736A (en) * | 1983-08-26 | 1984-12-04 | Strutz Jr Carl | Ink-dispensing system and method for silk-screen printing having squeegee stroke movement counter |
US4704961A (en) * | 1984-07-11 | 1987-11-10 | Roger A. Jensen | Screen printing assembly |
DE3719059A1 (en) * | 1987-06-06 | 1988-12-22 | Gerhard Klemm | SCREEN PRINTING MACHINE |
US20090217829A1 (en) * | 2008-02-28 | 2009-09-03 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Screen printing device with ink control |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1571064A (en) * | 1924-07-24 | 1926-01-26 | John S Latta | Wireless-receiving-apparatus cabinet |
US2157638A (en) * | 1937-09-30 | 1939-05-09 | Owens Illinols Glass Company | Stenciling apparatus |
US2382920A (en) * | 1941-11-18 | 1945-08-14 | Charles F Schaefer | Stencil coating machine |
US2606492A (en) * | 1948-06-12 | 1952-08-12 | James A Black | Silk screen stenciling machine |
-
1964
- 1964-09-22 US US398236A patent/US3252411A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1571064A (en) * | 1924-07-24 | 1926-01-26 | John S Latta | Wireless-receiving-apparatus cabinet |
US2157638A (en) * | 1937-09-30 | 1939-05-09 | Owens Illinols Glass Company | Stenciling apparatus |
US2382920A (en) * | 1941-11-18 | 1945-08-14 | Charles F Schaefer | Stencil coating machine |
US2606492A (en) * | 1948-06-12 | 1952-08-12 | James A Black | Silk screen stenciling machine |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3511213A (en) * | 1964-12-22 | 1970-05-12 | Mccorquodale Colour Display | Application of liquid colours to paper card or other smooth surfaces |
US3577914A (en) * | 1969-11-28 | 1971-05-11 | Heinrich Ronge | Screen printing machine employing a reciprocating printing and feed plate |
DE2016377A1 (en) * | 1970-04-06 | 1971-10-28 | Schnellpressenfabrik Frankenthal Albert & Cie, AG, 6710 Frankenthal | Screen printing machine |
US3779161A (en) * | 1970-09-28 | 1973-12-18 | Kurashiki Boseki Kk | Screen printer with ink level sensing and control |
US4106435A (en) * | 1974-03-19 | 1978-08-15 | Hilti Aktiengesellschaft | Apparatus for marking metal |
US3919967A (en) * | 1974-04-22 | 1975-11-18 | Automation Dev And Engineering | Traversing printer |
US3973491A (en) * | 1974-10-29 | 1976-08-10 | James A. Black | Flood coater and squeegee with viscosity sensing and control |
US4051777A (en) * | 1974-10-29 | 1977-10-04 | James A. Black | Stencilling apparatus with flow through print and flow action |
US4307662A (en) * | 1976-09-25 | 1981-12-29 | Mathias Mitter | Apparatus for printing on webs |
DE2744818A1 (en) * | 1976-10-07 | 1978-04-13 | Black James | WIPER DEVICE |
FR2366935A1 (en) * | 1976-10-07 | 1978-05-05 | Black James | RACLETTE MECHANISM FOR STENCIL DUPLICATOR |
WO1980001151A1 (en) * | 1978-12-11 | 1980-06-12 | G Warner | Emulsion lithographic printing system |
US4388864A (en) * | 1978-12-11 | 1983-06-21 | Warner "Autolitho" Corporation | Lithographic dampening system |
EP0086941A1 (en) * | 1982-02-18 | 1983-08-31 | Gerhard Klemm | Method and device for inking a flat screen |
JPS59185651A (en) * | 1983-04-07 | 1984-10-22 | Matsushita Electric Ind Co Ltd | Screen printer |
JPH0641200B2 (en) | 1983-04-07 | 1994-06-01 | 松下電器産業株式会社 | Screen printing machine and printing method |
US4485736A (en) * | 1983-08-26 | 1984-12-04 | Strutz Jr Carl | Ink-dispensing system and method for silk-screen printing having squeegee stroke movement counter |
US4704961A (en) * | 1984-07-11 | 1987-11-10 | Roger A. Jensen | Screen printing assembly |
DE3719059A1 (en) * | 1987-06-06 | 1988-12-22 | Gerhard Klemm | SCREEN PRINTING MACHINE |
US4998470A (en) * | 1987-06-06 | 1991-03-12 | Gerhard Klemm | Screen printing machine having an inclined screen |
DE3719059C2 (en) * | 1987-06-06 | 1994-02-24 | Gerhard Klemm | Screen printing machine for printing on a web |
US20090217829A1 (en) * | 2008-02-28 | 2009-09-03 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Screen printing device with ink control |
US7603949B2 (en) * | 2008-02-28 | 2009-10-20 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Screen printing device with ink control |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL RESEARCH, INC., SPARTA, MI A CORP OF MI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BLACK, JAMES A.;REEL/FRAME:004186/0509 Effective date: 19831101 Owner name: GENERAL ADVANCE CORP., A MI C ORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL RESEARCH, INC.;REEL/FRAME:004187/0656 Effective date: 19831101 Owner name: GENERAL ADVANCE CORP., A MI C ORP., STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENERAL RESEARCH, INC.;REEL/FRAME:004187/0656 Effective date: 19831101 |
|
AS | Assignment |
Owner name: ADVANCE PROCESS SUPPLY COMPANY, A CORP. OF ILL. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL RESEARCH, INC,;REEL/FRAME:004736/0075 Effective date: 19870707 |