EP0730954A1 - Siebdruckmaschine mit wechselbarer Rakel - Google Patents

Siebdruckmaschine mit wechselbarer Rakel Download PDF

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Publication number
EP0730954A1
EP0730954A1 EP96400481A EP96400481A EP0730954A1 EP 0730954 A1 EP0730954 A1 EP 0730954A1 EP 96400481 A EP96400481 A EP 96400481A EP 96400481 A EP96400481 A EP 96400481A EP 0730954 A1 EP0730954 A1 EP 0730954A1
Authority
EP
European Patent Office
Prior art keywords
squeegee
arm
counter
screen printing
machine according
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.)
Withdrawn
Application number
EP96400481A
Other languages
English (en)
French (fr)
Inventor
Jean-Pierre Dolige
Christian Rapello
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.)
TRIPETTE ET RENAUD
TRIPETTE AND RENAUD SA
Original Assignee
TRIPETTE ET RENAUD
TRIPETTE AND RENAUD SA
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 TRIPETTE ET RENAUD, TRIPETTE AND RENAUD SA filed Critical TRIPETTE ET RENAUD
Publication of EP0730954A1 publication Critical patent/EP0730954A1/de
Withdrawn legal-status Critical Current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
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • B41F15/423—Driving means for reciprocating squeegees

Definitions

  • the present invention relates to a screen printing machine designed to improve the quality of printing on supports varied in nature and dimensions.
  • Printing by machines of this type consists in spreading ink on a screen printing screen, which is then plated on the receiving support by means of a squeegee with flexible blade by which one exerts a pressure capable of penetrating the ink to the support through the screen meshes in the areas where they have been left open depending on the patterns to be printed.
  • the receiving support brought for example by sheet feed, is arranged on a printing table with respect to which the squeegee is automatically driven from one end to the other of the screen, or at least from one end to the other of the area thereof which carries the pattern to be printed.
  • the invention aims to solve the difficulty better than the solutions that have been proposed to date. It also aims to facilitate the implementation of the machines and their maintenance, to increase the life of the squeegees, to provide greater flexibility of use, in particular in adjusting both the pressure and the inclination of the squeegee. compared to the printing table.
  • the squeegee does not take an arrow detrimental to a print quality that is both good and regular, while in addition such an arrow would cause rapid wear and non-uniform flexible blade.
  • a screen printing machine advantageously comprises a lower frame on which a printing table is mounted , preferably movable vertically, and an upper frame, movable in inclination or in vertical displacement relative to the lower frame, which receives on the one hand the screen printing screen, preferably so as to be able to tilt about an axis pivot located at the front of the machine, and a carriage movable along the upper frame carrying squeegee and counter-squeegee and associated with drive means in the forward direction for the printing pass with the squeegee in operating position , from rear to front of the machine, and backwards with the counter-squeegee in the operating position, from front to back of the machine.
  • the invention proposes a screen printing machine having different new characteristics as defined by the claims and illustrated below, which it will most often be advantageous to apply in one or other of their technically operating combinations. .
  • the subject of the invention is therefore a screen printing machine of the type comprising a horizontal printing table and support means for a squeegee and a counter squeegee on a movable carriage above said table in the forward and reverse directions. return in association with reversing means for alternately raising and lowering said squeegee and said counter squeegee with respect to a screen printing screen interposed between them and said printing table.
  • said carriage comprises a master beam secured to means for guiding the outward and return movements of said carriage in rails fixed to an upper frame of the machine
  • said support means comprise a support arm for said squeegee and a support arm of said counter-squeegee, each of said arms being extended by end plates to which it is linked by means for adjusting its inclination around a horizontal axis which is parallel to it.
  • said reversing means are preferably constituted by jacks carried by said master beam and acting on said end plates that the counter-squeegee support arm comprises.
  • said reversing means alternating with the counter-squeegee are constituted by jacks acting on the squeegee support arm itself and mounted to slide on said master beam.
  • said squeegee arm, and therefore preferably also said counter-squeegee arm are each individually linked by their end plates to said master beam by devices guiding their vertical movements.
  • only the squeegee is interchangeable to use squeegees of different lengths in correspondence with sheets to be printed constituting the printing medium which are of different widths. More exactly it is the area to be printed which often varies while the nature and the dimensions of the sheets of paper remain the same, when it is for example a question of adding a color on a support already partially printed.
  • the squeegee is constituted in a conventional manner by a blade of flexible material secured to a metal plate which envelops its upper edge. It is advantageous that the counter-squeegee is not interchangeable. It is indeed commonly a metal blade bent at an obtuse angle, which does not have to undergo the same phenomena of wear as the flexible blade of the squeegee. It also does not have to be pressed against the screen, since its purpose is to simply collect the excess ink remaining on the screen during the return movement to bring it towards the rear of the machine.
  • the squeegee and the counter squeegee are both mounted under the same carriage movable longitudinally relative to the upper frame of the machine. They are linked to it separately by means of support means constituted by two carrying arms which are permanently installed on the carriage and which can themselves, independently of one another, be raised or lowered relative to a main beam of the mobile carriage which is common to them.
  • support means constituted by two carrying arms which are permanently installed on the carriage and which can themselves, independently of one another, be raised or lowered relative to a main beam of the mobile carriage which is common to them.
  • the inclination adjustment means are provided, intermediate between the main part of each of the arms on which the corresponding squeegee is fixed and its end plates. linked with the main beam, the only one truly secured to the carriage guided in the rails of the upper frame.
  • the pressure of the squeegee on the screen is adjustable by its sliding reversing jacks, generally pneumatically controlled, acting on the squeegee arm itself, in part main, when it is in its lowered position. It is also advantageous that the squeegee is mounted on said master beam of the carriage by stirrups sliding freely horizontally along this master beam as a function of the width of interchangeable squeegees, while, for its part, the counter-squeegee is preferably mounted fixed on its carrying arm.
  • the squeegee arm is subjected, at its end plates, to the action of elastic means for compensating for its weight, which may in particular consist of helical springs in compression in the carriage between a fixed fixed surface therein and a bearing secured to the arm, or more precisely, preferably, associated end plates.
  • elastic means for compensating for its weight which may in particular consist of helical springs in compression in the carriage between a fixed fixed surface therein and a bearing secured to the arm, or more precisely, preferably, associated end plates.
  • the screen printing machine comprises, in supporting structures, an upper frame 4 and a lower frame 5 enclosed in a casing 6.
  • the lower frame resting on the ground, carries the printing table 1, which is mounted normally horizontal and movable vertically in a conventional manner.
  • the upper frame is also movable vertically with respect to the lower frame, by four columns 8 in rectangular arrangement, which make it possible to raise or lower the whole of the upper frame, by sliding these columns in fixed guides 72 under the action motorized control and drive mechanisms 71 enclosed in the casing 6. It will be noted here, however, that in certain variant embodiments, this kind of movement of the upper frame, useful in particular for providing access to the screen, is no longer ensured. vertically, but at an angle to the lower frame.
  • the screen printing screen 2 being mounted in the lower part of the upper frame, the above displacements allow inter alia to move the screen away from the printing table each time a sheet to be printed is brought in from the rear of the machine in the printing position, in synchronism with the evacuation of a previous sheet printed towards the front of the machine.
  • the supply means for printing identical copies in series are also conventional in themselves.
  • the squeegee (or squeegee) 10 and the counter squeegee (or squeegee) 20 are mounted separately, each under a support bar, respectively the squeegee support bar 12 and the squeegee support bar 22, these two bars being mounted on a master beam 31 of the carriage 3, on either side of this beam which is common to them.
  • the two bars like the beam extend over the entire width of the machine, even beyond the lateral edges of the printing table 1 and whatever the width of the screen 2 used for a series of special impressions.
  • the master beam 31 is truly integral with the carriage 3, being directly welded at its two ends on two symmetrical elements 32 and 33 which carry rollers on horizontal guide rails 7 forming an integral part of the upper frame 4.
  • These rolling elements 32 and 33 are towed in one direction or the other by chains meshing in the conventional manner on an active pinion, when the latter is rotated from an electrically controlled motor 9 (FIGS. 1 and 5), in synchronism with the supply of the successive sheets to be printed.
  • the bars are themselves movable relative to these same elements 32, 33 both vertically in height and in inclination on the horizontal by rotation on themselves. They thus partly constitute intermediate support means between the scrapers and the mobile carriage. By them will be transmitted the inversion commands between low functional position and high rest position, alternately for the squeegee and the counter squeegee (fig. 6), these commands also being synchronized with the feeding of the sheets.
  • each bar 12 or 22 sees its vertical displacements relative to the beam 31 guided by rods 13, 23 to which they are linked by extension plates 17, 27 and which slide freely in sleeves 14, 24 formed in the fixed part of the carriage 3, at the level of the rolling elements 32 and 33.
  • the rods 13, 23 are also provided in the upper part with knurled and lock nut assemblies 15, 25 which serve to adjust the stop positions for the squeegee arm 12 and the counter squeegee arm 22 respectively, at the end of the vertical stroke.
  • Such a stop determining a low limit position of the counter-squeegee arm is particularly useful to prevent it from coming too close to the screen to the point of damaging it.
  • That of the squeegee is more optional, but it constitutes a safety stop when the squeegee is out of operation and that it therefore does not have to press on the screen, by determining a low limit position of the squeegee arm avoiding that the raclette come in contact on the screen only when it does not have to be active. Adjust of a stop position at the vertical end of the squeegee arm (12), safely determining a low limit position of the squeegee arm avoiding pressure on the screen only when the squeegee does not have to be active. Finally, it is often used to also have thereby an adjustable stop determining a high limit position of the displacements of one and / or the other arm under the action of the associated reversing jacks.
  • connection between each of the arms 12 and 22 and the extension plates 17, 27 takes place at each end by means of a system 16 for adjusting the inclination which determines the orientation of the corresponding arm on its horizontal axis.
  • this system involves a threaded stud 36 which is engaged in a slot 37 centered on a horizontal axis of fixed rotation and a cooperating nut which is tightened manually when the position of the stud in the slot corresponds to the desired inclination.
  • Plot 36 and light 37 are respectively provided on complementary flanges facing each other which are integral first with the arm in question and the other with its extension plate.
  • a second locking by nut is provided at the level of the axis of rotation of the flanges one on the other.
  • the homologous reversing means which act on the squeegee to raise or lower it alternately with the counter-squeegee appear in Figures 2 and 4. They are also cylinders 56 and 57 with pneumatic control , but here they are not fixed and they are arranged in the central part of the machine, on the main beam 31 itself. As they are supplied to exert the pressure necessary to apply the squeegee on the screen in the low functional position, they are slidably mounted both on the beam 31 and on the squeegee support arm 12.
  • three cylinders can be used, for example, rather than two, to better distribute the pressure over a very long squeegee. Furthermore, they can be positioned at will vis-à-vis the middle part of the squeegee used occasionally. Although it may be preferable to limit their number to two, by placing them near the ends of the squeegee grip, as shown in Figure 4.
  • the squeegee 10 is removable on the arm 12 and linked to the latter by sliding stirrups.
  • stirrups 46 and 47 each provided with a locking screw 48 ensuring firm clamping on the arm 12, in positions close to the ends of the squeegee; but here too, one or more could be added at intermediate positions in the case of large squeegees.
  • the assembly of the inversion and pressure jacks 56, 57 is carried out as it appears in FIGS. 2 or 7.
  • the jack body is integral with a jack carrier block 49 which slides in three grooves 51 formed on the side the along the beam 31.
  • the arrangement of the grooves on a lateral face of the beam 31 has the advantage of avoiding their fouling by splashes of ink.
  • the cylinder block 49 is clamped against the beam 31 in the fixed position chosen by means of a locking handle 52, which acts relative to the single central groove.
  • the piston rod of the cylinder is linked to the arm 12 by means of a stirrup 53 which has been designed so that it is permanently freely sliding on the arm 12. Therefore, it can be positioned automatically just below the cylinder exerting the overpressure in the low position of the squeegee. Furthermore, the connection between the piston of the pressure cylinder and the squeegee is articulated on the yoke so as to follow the angular orientation given to the arm 12 by means of the tilt adjustment by the system 16.
  • the arm 12, in its main central part 70, is constituted by a main carrying profile, more precisely a steel tube 72 of square section (analogous to that which constitutes the arm 22 of the actual squeegee), supplemented by a section 73 welded to it and bearing on its upper face.
  • the additional profile 73 laterally has a groove 74 of guiding the sliding of the stirrups 53. This not only makes it possible for the groove 74 to be practically insensitive to fouling by splashes of ink, but also for each stirrup 53 to be freely supported on the upper face of the complementary profile 73.
  • the squeegee arm 12 is calculated as a whole to remain rigid under all the operating conditions envisaged. It was therefore planned, in accordance with the invention, to complete the machine with a system for compensating the weight of the squeegee arm 12, which can be seen illustrated in FIGS. 2 and 4, by helical springs 77, maintained in compression in a chamber 78 formed in the rolling elements of the carriage, between a fixed bearing formed by the lower wall thereof and a disc terminating a vertical rod 54 welded at its other end to the upper face of the corresponding end plate extending the squeegee arm 12, so as to constitute a bearing integral with this plate.
  • FIG. 5 illustrates the means for receiving the screen 2 on the upper frame of the machine in that they are designed suitable for the use of screens of various dimensions.
  • the clean frame of the screen used 59 rests on side panels arranged transversely 81 and 83, which can be moved manually on the side members 82 of a support frame 60 permanently mounted on the upper frame 4.
  • the screen frame is then fixed in the position chosen by clamping levers 62, operated remotely by means of small pneumatic cylinders 82 mounted on these drop sides.
  • a motorized lever control system 61 makes it possible to lift the frame 60 from the rear, to rotate it around an axis 63, located at the front of the machine, in order to take off the screen from the sheet in progress. behind the squeegee as it passes.
  • Limit switches 64, 65 for the carriage 3 are arranged on the fixed members of the upper frame 4, in positions which are adjustable longitudinally, by sliding in suitable slots, in correspondence with the length and the position of the screen in its support frame 60, so as to cause the reversal of the direction of drive of the carriage and thus limit its movements in the forward direction as in the return direction relative to the guide rails 7.
  • the support frame 60 is actually made up of two frames, one in the other, involving an external frame, effectively tilting on the upper frame 4 around the axis 63, and an intermediate internal frame, deformable relative to this main external frame (60).
  • a deformation at four points is particularly advantageous. It results, for example, and according to the invention, in the fact that the internal frame consists of four sides which are not integral with each other; which can be moved in translation at the angles of the quadrilateral they form, relative to the external frame.
  • the deformation is ensured by means of knurling systems, stops and connection plates, without it being necessary for a deformation thus determined during a prior manual adjustment, to extend over more than a few millimeters or centimeters.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP96400481A 1995-03-10 1996-03-07 Siebdruckmaschine mit wechselbarer Rakel Withdrawn EP0730954A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9503314A FR2731384B1 (fr) 1995-03-10 1995-03-10 Machine de serigraphie a raclette interchangeable
FR9503314 1995-03-10

Publications (1)

Publication Number Publication Date
EP0730954A1 true EP0730954A1 (de) 1996-09-11

Family

ID=9477274

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400481A Withdrawn EP0730954A1 (de) 1995-03-10 1996-03-07 Siebdruckmaschine mit wechselbarer Rakel

Country Status (2)

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EP (1) EP0730954A1 (de)
FR (1) FR2731384B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000073072A1 (en) * 1999-05-31 2000-12-07 Argon Ht S.R.L. Printing bridge for silk-screen printing machines
CN111979657A (zh) * 2020-08-14 2020-11-24 湖南蓝印文化发展有限公司 一种蓝印花布现代化印染生产装置
CN112829445A (zh) * 2021-02-10 2021-05-25 蚌埠市鑫众玻璃科技有限公司 一种用于曲面丝网印刷机的印版装置
US11148410B2 (en) * 2016-08-23 2021-10-19 Clarion Technologies, Inc. Apparatus and method for printing on curved surfaces
CN113511000A (zh) * 2021-07-05 2021-10-19 浙江美声智能系统有限公司 大型转印设备刮刀调节机构
CN118850618A (zh) * 2024-09-27 2024-10-29 浙江省工业设备安装集团有限公司 一种带有防护组件的储罐罐体壁板运输用板材存放胎具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315817A2 (de) * 1987-11-09 1989-05-17 Werner Thieme GmbH & Co. KG Maschinenfabrik Siebdruckmaschine
GB2231534A (en) * 1989-05-15 1990-11-21 Precision Screen Machines Off-contact screen printing adjustment device
EP0460267A1 (de) * 1990-06-07 1991-12-11 Tokai Shoji Co., Ltd. Siebdruckmaschine
WO1993003924A1 (en) * 1991-08-27 1993-03-04 John Cronin Reciprocally shuttled double sided screener with tiltable print squeegee

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315817A2 (de) * 1987-11-09 1989-05-17 Werner Thieme GmbH & Co. KG Maschinenfabrik Siebdruckmaschine
GB2231534A (en) * 1989-05-15 1990-11-21 Precision Screen Machines Off-contact screen printing adjustment device
EP0460267A1 (de) * 1990-06-07 1991-12-11 Tokai Shoji Co., Ltd. Siebdruckmaschine
WO1993003924A1 (en) * 1991-08-27 1993-03-04 John Cronin Reciprocally shuttled double sided screener with tiltable print squeegee

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000073072A1 (en) * 1999-05-31 2000-12-07 Argon Ht S.R.L. Printing bridge for silk-screen printing machines
US6715414B1 (en) 1999-05-31 2004-04-06 Argon Ht S.R.L. Printing bridge for silk-screen printing machines
US11148410B2 (en) * 2016-08-23 2021-10-19 Clarion Technologies, Inc. Apparatus and method for printing on curved surfaces
CN111979657A (zh) * 2020-08-14 2020-11-24 湖南蓝印文化发展有限公司 一种蓝印花布现代化印染生产装置
CN112829445A (zh) * 2021-02-10 2021-05-25 蚌埠市鑫众玻璃科技有限公司 一种用于曲面丝网印刷机的印版装置
CN113511000A (zh) * 2021-07-05 2021-10-19 浙江美声智能系统有限公司 大型转印设备刮刀调节机构
CN118850618A (zh) * 2024-09-27 2024-10-29 浙江省工业设备安装集团有限公司 一种带有防护组件的储罐罐体壁板运输用板材存放胎具

Also Published As

Publication number Publication date
FR2731384B1 (fr) 1997-06-06
FR2731384A1 (fr) 1996-09-13

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