EP1025994A1 - Machine for rotary silk-screen printing of flat sheets with control system for synchronising rotation of the printing screen and feeding of the sheets to be printed - Google Patents

Machine for rotary silk-screen printing of flat sheets with control system for synchronising rotation of the printing screen and feeding of the sheets to be printed Download PDF

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Publication number
EP1025994A1
EP1025994A1 EP00200235A EP00200235A EP1025994A1 EP 1025994 A1 EP1025994 A1 EP 1025994A1 EP 00200235 A EP00200235 A EP 00200235A EP 00200235 A EP00200235 A EP 00200235A EP 1025994 A1 EP1025994 A1 EP 1025994A1
Authority
EP
European Patent Office
Prior art keywords
machine according
screen
doctor blade
printing
shaft
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Withdrawn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
EP00200235A
Other languages
German (de)
English (en)
French (fr)
Inventor
Gian Piero Barozzi
Giampaolo Bianchi
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.)
Aisa SpA
Original Assignee
Aisa SpA
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 Aisa SpA filed Critical Aisa SpA
Publication of EP1025994A1 publication Critical patent/EP1025994A1/en
Withdrawn legal-status Critical Current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
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details

Definitions

  • the present invention relates to a rotary machine for the silk-screen printing of flat sheets, comprising a rotating printing screen, a fixed doctor blade arranged inside it, and a conveyor belt which is provided with devices for controlling and adjusting the feed speed of the conveyor belt, so as to synchronise feeding of the flat sheet to be printed, fed by means of the said conveyor belt, with rotation of the printing screen.
  • the technical problem which is posed, therefore, is that of providing a silk-screen printing machine of the rotary type which is able to achieve very high printing precision for any form or size of sheet to be printed, and allow rapid and low-cost routine maintenance operations such as adjustment of the tension of the printing screen, cleaning thereof following each printing rotation, removal of the excess ink in the case of printing along the edge of the glass sheets for which an open area of the screen greater than the area of the glass is required, with consequent formation of an ink residue which is not deposited during rotation and which would hinder subsequent printing, adjustment of the distance between doctor blade and screen, and rapid changing of the doctor blade for the usual corrective grinding of the edge thereof.
  • a rotary machine for the silk-screen printing of flat sheets comprising a rotating printing screen, a fixed doctor blade arranged inside it, a conveyor belt endlessly mounted on a pair of rollers, one of which is a drive roller, for supplying the flat sheets to the printing screen and an actuating motor, there being provided devices for controlling and adjusting the feed speed of the conveyor belt, so as to synchronise feeding of the flat sheet to be printed, fed by means of the said conveyor belt, with rotation of the printing screen.
  • the rotary silk-screen printing machine is composed of a structure 100 for supporting and housing the actuation, transmission and control members; a cylindrical printing screen 200 which has arranged inside it the doctor blade 300 and the ink spreader 400 and outside it the device 500 for cleaning the said screen; and a conveyor belt 600 on which the sheets 10 to be fed to the screen 200 for printing are arranged.
  • the printing screen 200 has a reference generatrix Or and, depending on the size of the sheet 10 to be printed, printing areas contained within surface areas angularly lying between the generatrices A,Or and Or,B, while the sector lying within the generatrices A and B must remain free so as to allow accelerations/decelerations of the speed of translation of the belt 600 - necessary for achieving synchronisation between feeding of the workpiece to be printed and rotation of the printing screen - as well as supplying of the ink during interruptions in rotation of the printing screen envisaged for this purpose.
  • the means for operating the machine comprise a motor 20 (Fig. 3), the shaft 20a is connected to the screen 200 by suitable means which are described in detail below and by means of which the programmed speed of rotation is obtained.
  • the said shaft 20a of the motor 20 also has, coaxially mounted on it, in a cascade arrangement, a differential 30, the output shaft 31 of which has, mounted on it, a pulley 601 connected by means of a belt 601a to a further pulley 603 for actuating the shaft driving the belt 600.
  • the two planetary gears 32 of the differential 30 (Fig. 4) are mounted on a toothed wheel 33 which is idle with respect to the casing 34 of the differential and connect the two crown wheels 36a, 36b of the drive shaft 20a and the driven shaft 31.
  • the toothed wheel 33 in turn meshes with an endless screw 35a of a motor 35 of the differential, which motor 35 is actuated and controlled by a programming device 1000 which is activated upon receiving a signal from a sensor 605 (Fig. 2b) for detecting Ov and which is in turn connected to a sensor 205 for detecting Or.
  • the operating principle is therefore as follows:
  • This adjustment must however be performed during rotation of the screen corresponding to the angular surface-area portion thereof lying between the generatrices B and A or the non-printing portion.
  • the peripheral speed of the screen must coincide with the speed of rotation of the belt and it is therefore necessary to provide specific devices for compensating for any tolerances, play, wear and the like which produce a variation in the said speed of the conveyor belt 600.
  • said adjusting devices 1600 consist of means for adjusting the diameter of the roller 601b for actuating the belt 600. More particularly, said drive roller 601 consists of a first drum 1601 keyed onto a shaft 1603 supported by a frame 1602 and made to rotate by the pulley 603 connected to the differential 30 (Fig. 3).
  • the external surface 1601a of the first drum is conical with an inclination towards the inside (axis of rotation).
  • a second drum 1604 Coaxially with the first drum 1601 there is arranged a second drum 1604 which has a conical internal surface 1604a, with a conicity complementing that of the first drum to which it is joined in the axial direction.
  • the second external drum is fixed in position by means of a flange 1605 and an associated ring 1605a which are mounted on the shaft 1603 at the opposite axial ends of the drive roller.
  • the external surface 1605b of the drum 1604 is provided with longitudinal grooves 1605c which do not pass through the thickness of the drum and which allow an actual increase in the diameter of the roller without causing structural damage thereto as a result of the action of the radial forces produced by the interaction between the conical surfaces of the two drums.
  • the screen 200 is wound onto the external edge of two opposing discs 201a and 201b which are made to rotate by associated independent, but synchronised actuating means, so as to avoid any twisting of the screen during rotation, which twisting would be the cause of printing errors.
  • the external disc 201a is mounted on the free end 202a of a shaft 202, the other end 202b of which is supported in a cantilevered manner by a toothed wheel 203 actuated by a pinion 204a mounted on the output shaft of a reducer 204 which is in turn mounted on a tubular element 205 which is concentric with the shaft 202 with respect to which it is rotationally immobile via bearings 205a.
  • a flange 206 is also mounted on the tubular element 205 by means of associated bearings 206a, said flange 206 being made to rotate by means of a toothed wheel 207 which is in turn actuated by a pinion 204b mounted on the input shaft of the said reducer 204.
  • Said input shaft also has, mounted on it, a pulley 208 connected by means of a belt 208a to a second pulley 208b (Fig. 3) mounted on the shaft 20a of the motor 20.
  • a pulley 208 connected by means of a belt 208a to a second pulley 208b (Fig. 3) mounted on the shaft 20a of the motor 20.
  • this configuration also avoids external volumes (present, however, in the known machines) and the need to disassemble mechanical parts when the screen is replaced, which can be achieved (Fig.
  • the screen requires, in order to operate correctly, tensioning in the axial direction which ensures the planarity of the generatrices of the said screen during printing so that the latter operation is precise.
  • a corresponding device 220 which essentially consists of a crank 221 provided with a female thread 221c designed to engage with a corresponding threading 201c formed on an axial extension 201d of the disc 201a.
  • the crank 221 and the disc 201a have, arranged between them, the end 223a of levers 223 which are angularly arranged at a distance of 120° and pivotably mounted by means of a pin 224 on the disc 201a, the other end 223b of which is inserted into a corresponding seat 201e in the disc 201a.
  • crank 221 produces the forward movement thereof in an axial direction with a consequent inward axial thrust on the end 223a of the lever 223 which, rotating about the fulcrum 224, produces a forward movement of the opposite end 223b with a consequent outward axial thrust on the disc 201a which thus tensions the printing screen 200.
  • Rotation of the crank in the opposite direction slackens the screen 200 and allows the subsequent operations of replacement thereof to be performed.
  • doctor blade 300 and the ink spreader 400 both stationary with respect to the rotating screen 200, on the tubular element 205.
  • Said doctor blade 300 must in turn be mounted on devices which allow it to be installed/disassembled, independently of the screen 200, for the associated maintenance operations and allow adjustment of its distance from the screen so as to compensate for any wear in the edge as well as disengagement thereof from the screen for removal of the latter.
  • the device supporting the doctor blade 300 comprises a pair of flanges 301 which are mounted axially spaced on the tubular element 205 and provided with two arms 301a and 301b extending towards the screen 200.
  • the free end of the first arm 301a has, mounted on it, via a pin 321b, the support 320 for the doctor blade 300 which is also pivotably mounted on one end of a first lever 331, the other end of which is pivotably mounted on the second end of a second lever 332, the other end of which is pivotably mounted on the second arm 301b of the support bracket 301.
  • the pin 331a for connecting the two levers 331,332 also has, connected to it, the end of a strut 341 which is hinged by means of a pin 341a with the arm 301a supporting the doctor blade.
  • the length of the operative portion of the strut is adjustable by means of screw/nut-screw 343 joining system so as to allow variation of the stable-equilibrium position of the pin 331a during printing.
  • the strut 341 also has, coaxially mounted on it, a spring 342 which is arranged between the pin 341a and the pin 331a and which exerts a thrusting action on the pin 331a in the raised position of the doctor blade which is thus kept stably in position, being prevented from rotating by means of gravity towards the screen.
  • a spring 342 which is arranged between the pin 341a and the pin 331a and which exerts a thrusting action on the pin 331a in the raised position of the doctor blade which is thus kept stably in position, being prevented from rotating by means of gravity towards the screen.
  • the doctor-blade disengaging device is completed by means 350 for collecting any droplets of residual ink remaining attached to the doctor blade 300, consisting of an arm 351 which is fixed to the doctor-blade support bracket 301 and the free end of which has, hinged to it, a right-angled piece 352 extending in the axial direction over the whole length of the doctor blade 200.
  • the two sides 352a and 352b of the right-angled piece are arranged so that the rotation of the support 320 towards the rest position (Fig. 7) causes interference of the doctor blade with the side 352b of the right-angled piece 352, which causes anti-clockwise rotation of the said right-angled piece and positioning of its second side 352a underneath the edge of the doctor blade.
  • the doctor-blade support is formed by a first clamp 325 which is formed in the support body 320 and which acts against a second clamp 1325 for retaining the doctor blade 300.
  • the second clamp 1325 is also provided with means for adjusting the relative distance between the doctor blade 300 and the printing screen 200 so as to allow compensation of the wear affecting the said doctor blade, said wear causing an increase in the said relative distance, resulting in printing errors.
  • the first clamp 325 has fixed jaws 325a formed by one of the two sections of a seat 326 which is substantially in the form of an inverted U and formed in the body of the support 320 of the doctor blade 300 and movable jaws which are formed by a cam 329 pivotably mounted, by means of an associated spindle 329a, on the end of the other section 326b of the seat 326; said cam can be externally operated so as to rotate, by means of an extension 329b or the like.
  • the internal surface of the fixed jaws 325a is provided with a fixed pin 325b arranged at the free end of the said fixed jaws and a seat 327 arranged in the vicinity of the bottom of the U, which are designed to co-operate with a corresponding seat and extension of the fixed arm of the second clamp 1325 as will emerge more clearly below.
  • the second clamp 1325 is in turn formed by two arms 1325a and 1326a forming a seat in the form of an inverted U 1326, the closed part of which extends, forming a beak-like extension 1327 which is designed to co-operate with said seat 327 of the first clamp 325.
  • the external surface of the arm 1325a is provided with a seat 1325b which is designed to co-operate with said pin 325b of the first clamp 325.
  • the two arms 1325a and 1325b of the second clamp are connected together in the transverse direction by suitable screw means 1328 which allow tightening/slackening of the two arms onto/away from the doctor blade 300.
  • the said means for adjusting the relative distance between the doctor blade 300 and the printing screen 200 are provided inside the second clamp 1325 and are substantially formed by a thin metal plate 1329 which can be inserted in the longitudinal direction onto respective parallel seats 1330 which are formed on the internal opposite surfaces of the arms 1325a and 1325b and are designed to form a transverse end-of-travel abutment for insertion of the doctor blade 300 into the seat 1326 of the second clamp.
  • the height of the seats 1330 it is possible to make the interval of the said seats suitably smaller and hence ensure a corresponding fine positioning precision of the doctor blade in the radial direction.
  • the machine according to the invention envisages also means 500 for cleaning the screen 200 which are particularly important for the already mentioned operation of printing along the edge of the glass, for which an open area of the screen greater than the area of the glass is required, with the consequent formation of an ink residue which is not deposited during rotation and would adversely affect subsequent printing.
  • Said devices 500 are essentially formed by a device for emitting compressed air conveyed in a substantially radial direction towards the external surface of the said screen 200.
  • the device 500 comprises a first tubular element 501 which is provided with a longitudinal slit 501a and supplied at the opposite end sections by means of an air supply pipe 502.
  • Both the tubular element 501 and the pipe 502 are supported by an arm 503 which is attached to a plate 101 connected to the frame 100 of the machine.
  • the tubular element 501 is connected to the support arm 503 by means 504 for adjusting the angular position thereof so as to allow precise positioning of said tubular element at a correct distance from the screen 200.
  • An element 505 for opposing the camber affecting the screen during tensioning thereof is also envisaged, said camber causing in fact the movement of the screen away from the air emission device, resulting in imperfect cleaning of the screen.
  • Said opposition element 505 may for example be formed in a manner entirely similar to the doctor-blade support with its associated movements.
  • the printing screen 200 may vary its position relative to the plane of the conveyor belt 600 so as to be able to adjust the interference of the said screen with the surface of the workpiece to be printed in accordance with the variation in thickness of the latter.
  • This adjustment is obtained by means of a device 1200 which comprises a screw 1201 supported by the frame 100 and coupled with a female thread 101a, inserted in the plate 101 supporting the screen 200 and oscillating inside it about an associated pin 101b.
  • Said plate 101 in addition to being coupled with the screw 1201, is also pivotably mounted on a pin 1202 which is arranged in a direction perpendicular to that of the screw 1201 and about which it is able rotate.
  • operation of the means for actuating the screw 1201 which in Fig. 14 are represented by way of example as a crank 1203, causes rotation of the plate 101 about the pin 1202 with consequent displacement of the surface of the screen with respect to the belt 600; the degree of displacement may be detected by indicator means, for example consisting of a fixed graduated scale 1205 associated with a reference notch 1205a formed on the surface of the plate 101.
  • the machine according to the invention comprises vacuum devices 1110 such as vacuum suction pads or the like for gripping workpieces 10 during loading and for retaining them during feeding thereof by the belt 600.
  • vacuum devices 1110 such as vacuum suction pads or the like for gripping workpieces 10 during loading and for retaining them during feeding thereof by the belt 600.
  • These gripping devices consist of vacuum elements 1111 which are mounted on the free end of associated rods 1112a of cylinders 1112 which are attached to the support surface 606 of the belt 600, in a fixed position corresponding to the glass loading zone.
  • the belt 600 is consequently provided with openings 1113 which, once the loading zone has been reached, are aligned with the said devices 1110, allowing them to emerge without interference, during the time interval where the belt is stopped in order to allow loading of the workpieces.
  • Said cylinders are operated by means of the cycle control devices so that, when the workpiece 10 arrives on the belt 600, they are projecting perpendicularly beyond the said belt and are able to adhere to the sheet following activation of the vacuum; subsequently the rod 1112a is recalled downwards by the cylinder so that the glass is arranged in contact with the belt and inside perimetral profiles 1210 for containing the sheet which are described below, the relative centring being performed by the loading gripper.
  • the glass 10 is kept fixed to the belt by means of a suction produced by associated means, not shown, and acting on the glass through holes 610 in the belt.
  • said perimetral profiles 1210 are arranged on the conveyor belt and have the edge of the front side relative to the direction of feeding which is chamfered at a suitable angle of inclination which is designed to allow easy upward movement of the doctor blade 300 during printing, thus preventing, during this upward movement stage, the edge of the doctor blade from striking a sharp edge which would result in a drastic reduction in the working life of the screen, said devices also being able to be arranged on the external part of the screen so as to simplify the construction of the conveyor belt.
  • At least one protective rim may, by way of an alternative, be arranged on the printing screen so as to come into contact with the sheet during the synchronised passing movement of the latter for printing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP00200235A 1999-02-01 2000-01-21 Machine for rotary silk-screen printing of flat sheets with control system for synchronising rotation of the printing screen and feeding of the sheets to be printed Withdrawn EP1025994A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI990182 1999-02-01
ITMI990182 IT1307658B1 (it) 1999-02-01 1999-02-01 Macchina per la stampa serigrafica rotativa di lastre piane concontrollo di sincronizzazione tra la rotazione del retino di stampa e

Publications (1)

Publication Number Publication Date
EP1025994A1 true EP1025994A1 (en) 2000-08-09

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Application Number Title Priority Date Filing Date
EP00200235A Withdrawn EP1025994A1 (en) 1999-02-01 2000-01-21 Machine for rotary silk-screen printing of flat sheets with control system for synchronising rotation of the printing screen and feeding of the sheets to be printed

Country Status (4)

Country Link
EP (1) EP1025994A1 (pt)
JP (1) JP2000225682A (pt)
BR (1) BR0000541A (pt)
IT (1) IT1307658B1 (pt)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1132201A1 (en) * 2000-02-15 2001-09-12 Francesco Schinco Decorating machine for ceramic elements
CN106739454A (zh) * 2016-12-28 2017-05-31 东莞市誉铭新精密技术股份有限公司 一种杯状部件印刷定位治具
CN110143043A (zh) * 2019-04-10 2019-08-20 新疆翰阳电热科技股份有限公司 一种发热浆料印刷装置
CN110216981A (zh) * 2019-07-12 2019-09-10 通威太阳能（成都）有限公司 一种高阻密栅晶硅太阳电池片的丝网印刷装置
CN113910759A (zh) * 2021-10-12 2022-01-11 上海科俞实业有限公司 一种圆网印花用控温印花系统
CN114590046A (zh) * 2022-03-09 2022-06-07 深圳市鑫众塑料包装机械有限公司 一种异形锥体工件丝网印刷方法及其印刷设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5476594B2 (ja) * 2009-02-27 2014-04-23 独立行政法人 国立印刷局 ロータリースクリーン装置
CN106274033A (zh) * 2016-10-12 2017-01-04 京东方科技集团股份有限公司 一种印刷机
KR101994447B1 (ko) * 2019-04-04 2019-06-28 김종윤 에폭시 타일시트 제조장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1292577A (en) * 1970-06-22 1972-10-11 Reggiani Spa A rotating screen printing machine
EP0522640A1 (en) * 1991-07-05 1993-01-13 Stork Brabant B.V. Screen printing device with continuous registering of rotating stencils
WO1999054138A1 (en) * 1998-04-22 1999-10-28 Altair S.R.L. Printing unit with synchronised control for rotary or flat silk-screen printing machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1292577A (en) * 1970-06-22 1972-10-11 Reggiani Spa A rotating screen printing machine
EP0522640A1 (en) * 1991-07-05 1993-01-13 Stork Brabant B.V. Screen printing device with continuous registering of rotating stencils
WO1999054138A1 (en) * 1998-04-22 1999-10-28 Altair S.R.L. Printing unit with synchronised control for rotary or flat silk-screen printing machines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1132201A1 (en) * 2000-02-15 2001-09-12 Francesco Schinco Decorating machine for ceramic elements
CN106739454A (zh) * 2016-12-28 2017-05-31 东莞市誉铭新精密技术股份有限公司 一种杯状部件印刷定位治具
CN110143043A (zh) * 2019-04-10 2019-08-20 新疆翰阳电热科技股份有限公司 一种发热浆料印刷装置
CN110216981A (zh) * 2019-07-12 2019-09-10 通威太阳能（成都）有限公司 一种高阻密栅晶硅太阳电池片的丝网印刷装置
CN113910759A (zh) * 2021-10-12 2022-01-11 上海科俞实业有限公司 一种圆网印花用控温印花系统
CN114590046A (zh) * 2022-03-09 2022-06-07 深圳市鑫众塑料包装机械有限公司 一种异形锥体工件丝网印刷方法及其印刷设备
CN114590046B (zh) * 2022-03-09 2024-06-04 深圳市鑫众塑料包装机械有限公司 一种异形锥体工件丝网印刷方法及其印刷设备

Also Published As

Publication number Publication date
IT1307658B1 (it) 2001-11-14
ITMI990182A1 (it) 2000-08-01
JP2000225682A (ja) 2000-08-15
BR0000541A (pt) 2000-10-03

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