EP0423428A2 - Procédé et dispositif pour régler la position d'une racle d'impression et d'une racle à déplacement dans la sérigraphie - Google Patents

Procédé et dispositif pour régler la position d'une racle d'impression et d'une racle à déplacement dans la sérigraphie Download PDF

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Publication number
EP0423428A2
EP0423428A2 EP90111309A EP90111309A EP0423428A2 EP 0423428 A2 EP0423428 A2 EP 0423428A2 EP 90111309 A EP90111309 A EP 90111309A EP 90111309 A EP90111309 A EP 90111309A EP 0423428 A2 EP0423428 A2 EP 0423428A2
Authority
EP
European Patent Office
Prior art keywords
flood
doctor blade
pressure
squeegee
printing
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.)
Granted
Application number
EP90111309A
Other languages
German (de)
English (en)
Other versions
EP0423428A3 (en
EP0423428B1 (fr
Inventor
Rudolf August Kürten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0423428A2 publication Critical patent/EP0423428A2/fr
Publication of EP0423428A3 publication Critical patent/EP0423428A3/de
Application granted granted Critical
Publication of EP0423428B1 publication Critical patent/EP0423428B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 invention relates to a method for delivering a pressure doctor blade of defined and constant elasticity and a flood doctor blade during screen printing.
  • the invention further relates to a device for performing this method.
  • the screen printing machines considered here have a flood squeegee, which is alternately lowered with the squeegee and has the task of transporting the printing medium applied to the stencil after the advancement through the squeegee during a printing process and thereby distributing it over the stencil.
  • the quality of screen printing depends on many factors, some of which have not yet been mastered with conventional screen printing machines.
  • This includes not only a precisely defined contact pressure of the squeegee for sealing between the screen stencil and a solid base during the printing process, but also an exactly defined contact pressure of the squeegee against the pressure medium applied to the screen stencil during the flooding process.
  • the Infeed force with which the flood knife is pressed against the printing medium applied to the screen stencil during the flooding process, and the distance between the bottom edge of the flood knife and the screen stencil have a decisive influence on the type of application of the printing medium on the screen stencil and thus the result of the subsequent printing process.
  • a method of the type mentioned is described in the older German patent application P 38 42 419.3.
  • the infeed force with which the squeegee is pressed against the solid base for example a flat table or a drum, is first optimized in one or more test prints and then kept constant at this value in the subsequent prints.
  • a pneumatic or hydraulic cylinder unit can be used to generate the feed force serve, the delivery force is initially optimized by adjusting the pressure of the printing medium in the test prints and the pressure is then kept constant in this value determined in the subsequent prints.
  • a method for delivering the flood doctor blade in which the feed force with which the flood doctor blade is pressed against the printing medium applied to the screen stencil during the flooding process, is precisely defined and kept constant is not described in the earlier German patent mentioned.
  • the flood knife is also assigned a cylinder unit. However, this serves to move the flood doctor blade up and down during screen printing. This older patent application does not show that it can also be used to adjust the delivery force. Only the feed path of the flood knife to the screen template is limited by a stop, which e.g. can be located on a locking ring which is arranged on a piston rod extending upward from the cylinder unit for the flood doctor blade.
  • the control circuit for the cylinder unit is connected to the control circuit for the cylinder unit of the printing doctor. With such a method, however, an optimally defined delivery of the flood doctor blade is not guaranteed.
  • the invention has for its object a method to deliver a printing squeegee and a flood squeegee, which ensures a precisely defined delivery of the printing squeegee and flood squeegee, which delivers an optimal screen print that can also be reproduced over a large print run.
  • the object is achieved in that the feed force with which the squeegee is pressed against the fixed base of the printing medium, and the feed force with which the squeegee is pressed during the flooding process against the compression medium applied to the stencil, by one each from the control circuit of the Flood doctor or the pressure doctor independent pneumatic or hydraulic control circuit is generated, the respective feed force is initially optimized by adjusting the pressure of the printing medium in one or more test prints or from experience and then kept constant in the subsequent prints at this determined value.
  • the feed force of the pressure squeegee and the flood squeegee can be optimally adjusted in test runs.
  • the doctor blades are then lowered with the same respective delivery force that was used in the last test prints.
  • the delivery movement of the printing squeegee is finally limited by the fixed base of the printing medium after the printing squeegee has lowered onto the screen stencil with the determined constant delivery force and pressed it onto the printing medium.
  • the infeed movement of the flood doctor blade is limited by the pressing means applied to the screen template after the flood doctor blade has lowered onto it with the determined constant infeed force.
  • Fixing the feed path of the flood knife to the screen template is also expedient and may be necessary during flooding and in particular at higher speeds, the flood knife can penetrate deeper into the printing medium with a constant feed force, which leads to an uneven placement of the printing medium on the screen template. Therefore, the feed path of the flood doctor to the screen stencil measured during optimization of the feed force is preferably fixed before flooding and kept constant during flooding.
  • At least one cylinder unit consisting of a cylinder and a double-acting piston with a piston rod, be provided for generating the respective feed force, and a pressure regulator is provided for keeping the pressure of the pressure medium constant, the Control circuit of the cylinder unit for the flood doctor blade is independent of the control circuit of the cylinder unit for the pressure doctor blade.
  • the flood knife during the flooding process may only bear a relatively low pressure on the compression medium applied to the screen template, the flood knife is preferably biased in the direction facing away from the screen template.
  • the feed force of the flood doctor blade is generated exclusively by the cylinder pressure. Therefore, the amount of prestress is preferably at least equal to the weight of the flood doctor blade and its doctor blade holder.
  • the bias can e.g. be generated by a tension spring or a counter cylinder.
  • the described prestressing of the flood doctor blade in the direction facing away from the screen template also has the advantage that the change between the downward and upward movement of the flood doctor blade can be carried out very quickly.
  • the cylinder unit used to feed the respective doctor blade is preferably carried by a guide block which has a guide for a holding device of the doctor blade holder connected to the piston rod of the cylinder unit.
  • the holding device has a cylindrical part which is displaceably guided in a bearing sleeve arranged in the guide block and has a central bore in which a ball is arranged without play and through which the piston rod runs with lateral play, the lower end of the piston rod being firmly connected to the ball.
  • the bore of the cylindrical part expediently has a cylindrical extension at one end with an internal thread and a hemispherical base region, the radius of which corresponds to the radius of the ball.
  • a counterpart with a dome-shaped recess directed towards the ball is then screwed into the cylindrical extension, to which the doctor holder is attached.
  • the holding device is preferably fixedly connected at the end opposite the piston rod to a compensating element which can be rotated on or in the doctor blade holder with limited play about an axis pointing in the horizontal guide direction of the pressure or flood doctor blade and is arranged displaceable in the horizontal transverse direction to the axis.
  • the compensating element is expediently arranged between two side walls of the doctor blade holder which extend in the horizontal transverse direction of the pressure or flood doctor blade and has an elongated hole which extends in the same direction and in which a block is arranged so as to be displaceable in the direction of expansion of the elongated hole, with the aid of the block a bolt which extends perpendicularly to the two side walls and is fastened rotatably to the two side walls.
  • a particularly stable guidance can be achieved in that the pressure doctor blade and the flood doctor blade or their doctor blade holder are carried by one and the same guide block which has parallel guides for the holding devices of the two doctor blade holders.
  • the common guide block for the two doctor blades also has the advantage that they can be easily pivoted with the guide block.
  • the doctor blades can be easily exchanged or cleaned by swiveling the guide block.
  • the guide block can be pivotally supported by a shaft which extends in the horizontal transverse direction of the pressure and flood doctor blade and which is rotatably mounted in a guide block for the pivoting movement.
  • a pneumatic or hydraulic cylinder unit which consists of a cylinder and a double-acting piston with a piston rod and is carried by the guide block for the pivoting movement, is preferably used to generate the pivoting movement.
  • a gear wheel which is fixedly connected to the shaft can be mounted in the guide block and can be actuated and locked by a gear rack connected to the piston rod of the cylinder unit.
  • the guide block can preferably be pivoted by approximately 900 relative to the vertical position.
  • the device shown in the figures works according to a method to be described below.
  • the device shown in FIG. 1 corresponds to the device shown in FIG. 2 except for the locking device contained in FIG. 2 and discussed below. 1 shows a section along the line I-I in FIG. 2.
  • the device shown in FIG. 4 connects to the shaft shown in FIG. 1 on the left.
  • a corresponding symmetrical device is connected to the shaft on the right.
  • the flood knife 1 is lowered into the flood position.
  • the screen template 2 is lifted during the flooding process from the print carrier (not shown in the drawing) and the solid base.
  • the printing medium 3 is applied to the screen stencil 2, which is transported back from the flood knife 1 in the direction of arrow 4 after the printing process and is thereby distributed over the screen stencil 2.
  • the pressure doctor blade 5, which is arranged approximately parallel to the flood doctor blade 1, is raised during the flooding process, so that it cannot impair the flooding of the printing medium 3.
  • the screen template 2 is moved downward again to a small distance from the print carrier arranged on the fixed base.
  • the up and down movement of the screen template 2 is effected in the screen printing machine on which this is based, by a pivotable frame in which the screen template 2 is clamped.
  • the squeegee 5 is lowered against the screen template 2, which is pressed against the solid base for sealing between the screen template 2 and the fixed base.
  • a squeegee 5 which comprises a doctor blade 6 made of thin sheet steel and at the lower end of which a doctor blade profile 7 made of a flexible plastic.
  • the flood squeegee 1 and the pressure squeegee 5 are each clamped in a squeegee holder 8, which is supported by a guide block 9 via a holding device to be described, which is in turn pivotally supported by a shaft 10.
  • the shaft 10 is rotatably mounted in a guide block 12, which is arranged towards a side wall 11 of the screen printing machine, for the pivoting movement.
  • cylinder units 13 and 14 each of which consists of a cylinder 15 or 16 and a double-acting piston 17 which is supported by a continuous piston rod 19 or 20 is worn.
  • the piston rod 19 or 20 protrudes from the top of the cylinder unit 13 or 14.
  • the lower end of the piston rod 19 or 20 is connected to the holding device for the respective doctor blade holder 8 to be described.
  • the cylinders 15 and 16 are supplied with compressed air via compressed air connections 21 and 22 by control circuits which are independent of one another, corresponding to the respective changing position of flood knife 1 and pressure knife 5, above or below the piston 17.
  • the delivery devices for the flood doctor blade 1 and the pressure doctor blade 5 carried by the two guide blocks 9 are also identical.
  • the flood knife 1 is prestressed in the direction facing away from the screen template 2.
  • the pretension is generated by a tension spring 25 which is arranged between an arm 26 fastened to the doctor holder 8 and an arm 27 fastened to the guide block 9.
  • the bias voltage compensates for the weight of the flood doctor blade 1, the doctor blade holder 8 and the holding device of the doctor blade holder 8 guided through the guide block 9.
  • the holding device for the flood doctor blade 1 or the pressure doctor blade 5, which has already been mentioned several times, consists of a cylindrical part 28 or 29, which is guided displaceably in a bearing sleeve 30 or 31 arranged in the guide block 9 and has a central bore 32 or 33.
  • the bore 32 or 33 has at its downward-facing end a cylindrical extension 34 or 35 with an internal thread and a hemispherical bottom region 36 or 37.
  • a ball 38 or 39 is inserted, the Radius corresponds to the radius of the hemispherical base region 36 or 37.
  • the piston rod 19 or 20 of the cylinder unit 13 or 14 arranged on the guide block 9 runs through the bore 32 or 33 from above.
  • the outer diameter of the piston rod 19 or 20 is smaller than the inner diameter of the bore 32 or 33, so that the piston rod 19 or 20 has a lateral play.
  • the lower end of the piston rod 19 or 20 is screwed from above into the ball 38 or 39 along the center thereof.
  • a counterpart 40 or 41 with a dome-shaped recess 42 or 43 directed towards the ball 38 or 39 is screwed into the cylindrical extension 34 or 35 from below, so that the ball 38 or 39 is free of play but rotatable in the extension 34 or 35 is arranged.
  • the counterpart 40 or 41 projects with its external thread downward relative to the cylindrical part 28 or 29 and is secured against being unscrewed from the cylindrical part 28 or 29 by a lock nut 44 or 45.
  • the compensating element 46 consists of an upper plate 47 and a lower block 48, which are screwed together.
  • the plate 47 is fastened to the lower end face of the cylindrical part 28 and 29 by means of a screw 49 countersunk therein.
  • the lower block 48 has an elongated hole 50 which expands in the horizontal transverse direction of the flood doctor blade 1 or the pressure doctor blade 5.
  • a cuboid block 51 is also arranged to be displaceable in the direction of expansion of the elongated hole 50.
  • the cuboid block 51 has a bore 52 extending through the elongated hole 50.
  • This compensating element 46 is arranged between two side walls of the doctor blade holder 8, which extend in the horizontal transverse direction of the flood doctor blade 1 or pressure doctor blade 5. With the aid of a bolt extending through the bore 52 of the cuboid block 51, the block 51 is rotatably attached to the two side walls.
  • the compensating element 46 can therefore rotate in the doctor blade holder 8 with limited play about an axis pointing in the horizontal guide direction of the flood doctor blade 1 or pressure doctor blade 5 and move it in the horizontal transverse direction to the axis.
  • the shaft 10 carrying the guide block for the flood doctor 1 and the pressure doctor 5 extends through a bore 53 of the guide block 12 for the pivoting movement and is supported therein by a bearing sleeve (not shown in the drawing).
  • a gear 54 is fixedly connected to the shaft 10, that is driven by a pneumatic cylinder unit 55 carried by the guide block 12, consisting of a cylinder 56 and a double-acting piston with a piston rod, for rotating the shaft 10.
  • the piston rod of the cylinder unit 55 actuates a rack 57, which cooperates with the gear 54.
  • a recirculating ball unit 58 is fixedly attached on the side of the guide block 12 remote from the shaft 10.
  • the ball circulation unit 58 slides on a guide rail 59 arranged on a side wall 11 of the screen printing machine parallel to the table surface. If, on the other hand, a drum is used as a fixed support, the ball circulation unit 58 is fixed to the side wall 11 of the Screen printing machine arranged.
  • the cylinder unit 55 for the pivoting movement works in such a way that when compressed air is applied to the upper chamber of the cylinder 56, the guide block 9 is pivoted approximately into a horizontal position and fixed there. In this position, the flood doctor blade 1 and the pressure doctor blade 5 can be easily replaced or cleaned. By pressurizing the lower chamber of the cylinder 56, the guide block 9 is pivoted back into its vertical position and fixed there.
  • the guide block 9 is preferably attached to the shaft 10 by an expansion dowel 60.
  • Such an expansion anchor 60 allows simple and quick adjustment of the angle setting of the guide block 9 with respect to the shaft 10, which is important for a precisely defined feed movement of the flood doctor blade 1 and the pressure doctor blade 5.
  • Fig. 2 shows, as already indicated, an additional locking device through which the the last test print measured delivery path of the printing squeegee 5 to the solid base and the flood squeegee 1 to the screen stencil 2 can be set and kept constant in the subsequent prints.
  • This device is a locking ring 61 or 62, which is loosely displaceably placed on the continuous piston rod 19 or 20 and can be fixed on this by means of a locking screw 63 or 64.
  • a locking screw instead of a locking screw, another mechanically, pneumatically or hydraulically adjustable stop can also be used.
  • means, such as a certain pressure acting on the lower chamber of the cylinder 15, can be provided which prevent the flood knife 1 from lifting under the piston rod 19 under certain circumstances.
  • a test flooding is then carried out with this air pressure and then checked whether it meets the desired quality requirements. If it is not yet satisfied, the air pressure is adjusted and another test flooding is carried out. This is repeated until a perfect order from the Compression means results. Then, with the flood knife 1 lowered, the locking screw 63 is tightened and the locking ring 61, which rests on the upper end face of the cylinder unit 13 due to its own weight, is blocked in this position. The locking ring 61 is now firmly connected to the continuous piston rod 19.
  • the delivery force for the pressure doctor blade 5 is optimized in a manner analogous to the above-described method for the flood doctor blade 1 by adjusting the air pressure in the cylinder 16.
  • the air pressure in the cylinders 15 and 16 can also be optimized alternately during test flooding and subsequent test printing. The air pressures are adjusted until there is a perfect screen print. In particular, with the device described above, the air pressure values can then be kept constant even with a large number of subsequent pressure and flood processes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP90111309A 1989-10-17 1990-06-15 Procédé et dispositif pour régler la position d'une racle d'impression et d'une racle à déplacement dans la sérigraphie Expired - Lifetime EP0423428B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934569A DE3934569A1 (de) 1989-10-17 1989-10-17 Verfahren zum zustellen einer druckrakel und einer flutrakel beim siebdruck
DE3934569 1989-10-17

Publications (3)

Publication Number Publication Date
EP0423428A2 true EP0423428A2 (fr) 1991-04-24
EP0423428A3 EP0423428A3 (en) 1991-06-05
EP0423428B1 EP0423428B1 (fr) 1994-12-07

Family

ID=6391610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111309A Expired - Lifetime EP0423428B1 (fr) 1989-10-17 1990-06-15 Procédé et dispositif pour régler la position d'une racle d'impression et d'une racle à déplacement dans la sérigraphie

Country Status (3)

Country Link
EP (1) EP0423428B1 (fr)
AT (1) ATE115042T1 (fr)
DE (2) DE3934569A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5996487A (en) * 1997-04-11 1999-12-07 Matsushita Electric Industrial Co., Ltd. Solder paste screen printing apparatus and solder paste screen printing method
US6105495A (en) * 1996-05-28 2000-08-22 Matsushita Electric Industrial Co., Ltd. Screen printing apparatus and screen printing method
DE10011059A1 (de) * 2000-03-07 2001-09-20 Isimat Gmbh Siebdruckmaschinen Siebdruckeinrichtung
CN104494293A (zh) * 2014-12-11 2015-04-08 东方日升新能源股份有限公司 一种解决晶硅电池丝网印刷局部粗线的印刷头
US9511583B2 (en) * 2008-02-22 2016-12-06 M&R Printing Equipment, Inc. Printing head for multi-stroke screen printing apparatus
CN111421950A (zh) * 2020-05-11 2020-07-17 台州市莱恩克智能科技有限公司 一种丝网印刷机的印刷主体
CN112677641A (zh) * 2021-01-29 2021-04-20 肇庆力行智能制造有限公司 丝印机刮头装置
EP3808563A1 (fr) * 2019-10-15 2021-04-21 Lambotec GmbH Procédé mise en oeuvre par un ordinateur permettant de commander une machine d'impression par sérigraphie ainsi que machine d'impression par sérigraphie commandée par un ordinateur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5320970A (en) * 1987-11-06 1994-06-14 Washington Research Foundation Detection of collagen degradation in vivo
DE19624442C2 (de) * 1996-06-19 1999-08-05 Leipold Xaver F Gmbh & Co Kg Verfahren zum Herstellen von Druckgut mittels Durchdruck, insbesondere Siebdruck und Durchdruck-, insbesondere Siebdruckmaschine
CN102653163A (zh) * 2012-05-11 2012-09-05 苏州金牛精密机械有限公司 网印机专用刮刀

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057357A (en) * 1979-07-25 1981-04-01 Brasa U Silk screen printing machine
DE2943893A1 (de) * 1979-10-31 1981-05-07 Gerhard Ing.(grad.) 4800 Bielefeld Klemm Verfahren und vorrichtung zum bedrucken von flaechiger ware mit mindestens einer siebdruckstation
DE3629188A1 (de) * 1986-08-28 1988-03-17 Kuerten Rudolf August Verfahren und vorrichtung zum zustellen der rakel einer siebdruckmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT258323B (de) * 1965-07-09 1967-11-27 Peter Zimmer Doppelrakelsteuerung
DE3842419A1 (de) * 1988-12-16 1990-06-21 Rudolf August Kuerten Verfahren zum zustellen einer siebdruckrakel und vorrichtung zur ausuebung des verfahrens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057357A (en) * 1979-07-25 1981-04-01 Brasa U Silk screen printing machine
DE2943893A1 (de) * 1979-10-31 1981-05-07 Gerhard Ing.(grad.) 4800 Bielefeld Klemm Verfahren und vorrichtung zum bedrucken von flaechiger ware mit mindestens einer siebdruckstation
DE3629188A1 (de) * 1986-08-28 1988-03-17 Kuerten Rudolf August Verfahren und vorrichtung zum zustellen der rakel einer siebdruckmaschine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6105495A (en) * 1996-05-28 2000-08-22 Matsushita Electric Industrial Co., Ltd. Screen printing apparatus and screen printing method
US5996487A (en) * 1997-04-11 1999-12-07 Matsushita Electric Industrial Co., Ltd. Solder paste screen printing apparatus and solder paste screen printing method
DE10011059A1 (de) * 2000-03-07 2001-09-20 Isimat Gmbh Siebdruckmaschinen Siebdruckeinrichtung
DE10011059C2 (de) * 2000-03-07 2003-10-09 Isimat Gmbh Siebdruckmaschinen Siebdruckeinrichtung
US9511583B2 (en) * 2008-02-22 2016-12-06 M&R Printing Equipment, Inc. Printing head for multi-stroke screen printing apparatus
CN104494293A (zh) * 2014-12-11 2015-04-08 东方日升新能源股份有限公司 一种解决晶硅电池丝网印刷局部粗线的印刷头
EP3808563A1 (fr) * 2019-10-15 2021-04-21 Lambotec GmbH Procédé mise en oeuvre par un ordinateur permettant de commander une machine d'impression par sérigraphie ainsi que machine d'impression par sérigraphie commandée par un ordinateur
CN111421950A (zh) * 2020-05-11 2020-07-17 台州市莱恩克智能科技有限公司 一种丝网印刷机的印刷主体
CN111421950B (zh) * 2020-05-11 2024-04-19 深圳润伽包装印刷有限公司 一种丝网印刷机的印刷主体
CN112677641A (zh) * 2021-01-29 2021-04-20 肇庆力行智能制造有限公司 丝印机刮头装置

Also Published As

Publication number Publication date
EP0423428A3 (en) 1991-06-05
ATE115042T1 (de) 1994-12-15
DE59007929D1 (de) 1995-01-19
DE3934569A1 (de) 1991-04-25
EP0423428B1 (fr) 1994-12-07

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