EP2990203B1 - Siebdruckmaschine mit Servoantrieb. - Google Patents

Siebdruckmaschine mit Servoantrieb. Download PDF

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Publication number
EP2990203B1
EP2990203B1 EP14182171.0A EP14182171A EP2990203B1 EP 2990203 B1 EP2990203 B1 EP 2990203B1 EP 14182171 A EP14182171 A EP 14182171A EP 2990203 B1 EP2990203 B1 EP 2990203B1
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EP
European Patent Office
Prior art keywords
servo
cylinder
driving
screen
screen printing
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Active
Application number
EP14182171.0A
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English (en)
French (fr)
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EP2990203A1 (de
Inventor
Tung Chin Chen
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Atma Champ Enterprise Corp
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Atma Champ Enterprise Corp
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Priority to EP14182171.0A priority Critical patent/EP2990203B1/de
Publication of EP2990203A1 publication Critical patent/EP2990203A1/de
Application granted granted Critical
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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
    • B41F15/0813—Machines for printing sheets with flat screens
    • B41F15/0827—Machines for printing sheets with flat screens with a stationary squeegee and a moving screen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/04—Grippers
    • B41F21/05—In-feed grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/08—Combinations of endless conveyors and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2215/00—Screen printing machines
    • B41P2215/10—Screen printing machines characterised by their constructional features
    • B41P2215/11—Registering devices
    • B41P2215/112—Registering devices with means for displacing the frame

Definitions

  • the present invention relates to a cylinder screen printing machine, and more particularly to a servo-driven cylinder screen printing machine that uses multiple independent driving devices to separately drive a print cylinder and a screen carrier thereof for performing screen printing, so that the cylinder screen printing machine has simplified mechanism design to avoid interference of synchronization accuracy and obtain increased printing accuracy.
  • the rotary motion of the central motor drives a feeder, an infeed table feeder, a side alignment device, a print cylinder, a screen carrier, and a sheet delivery device of the mechanical screen printing machine to operate.
  • a direct-driven center shaft and flying gears provided on left and right sides of the print cylinder's axis together form a driving means. And, through engagement of the flying gears with two sprocket bars, the screen carrier is driven on both sides to move forward for printing or move backward for flooding.
  • the first conventional mechanical screen printing machine is subject to interference of the mechanical accuracy of synchronous drive of the screen carrier and the print cylinder.
  • the mechanical driving is realized via two tooth contact points between the screen carrier and the gears on the left and the right side of the print cylinder axis, and the mesh between gears will change with different rotational speeds. Therefore, accuracy in synchronization on each point of movement is required to guarantee the position between the printing material sheet, which is fixed to the print cylinder surface and rotating along with the print cylinder, and the screen carrier that horizontally moves above the print cylinder.
  • the gears having operated for a long period of time will wear down to result in increased backlash. And, inaccuracy in synchronization will cause printing inaccuracy when the backlash is large.
  • the conventional screen printing machine with separate servo drives is driven to operate by independent drives that are electronically synchronized and controlled. More specifically, there is a first driving source 10 for driving a feeder 101, an infeed table 102 and a side alignment device 103; a second driving source 11 for driving a print cylinder 111 and a rotary shaft 112; a third driving source 12 for driving a screen carrier 121; and a fourth driving source 13 for driving a delivery belt 131.
  • the third driving source 12 drives free-wheel gears 124 provided on left and right sides of the screen carrier 121 via gears 123 connected to two sides of a transfer shaft 122.
  • German patent DE 4444189 A1 published on February 22, 1996 , the PCT patent application WO 2006/051558 A1 published on May 18, 2006 , and the US patent No.5706722A published on January 13, 1998 disclose a cylinder-type screen printing machine comprising: a printing cylinder, a screen being disposed on top of the printing cylinder, and at least one drive connected to the printing cylinder and the screen respectively to acuate the rotation of the printing cylinder and the linear movement of the screen. All of the drives can operate others mechanical elements independently or synergistically.
  • a primary object of the present invention is to provide a servo-driven cylinder screen printing machine, which uses multiple independent driving devices to separately drive a print cylinder and a screen carrier thereof for performing screen printing as defined in claim 1.
  • tooth racks and gear wheels inside the cylinder screen printing machine are saved to largely reduce the mass force during the printing operation, the negative effects caused by the backslashes in the tooth drive via gears and tooth racks are avoided to enable largely upgraded screen printing accuracy, and the screen carrier can be easily installed from a lateral side of the cylinder screen printing machine.
  • Another object of the present invention is to provide a servo-driven cylinder screen printing machine, of which the print cylinder and the screen carrier are connected to two mutually independent driving devices. Therefore, unlike the conventional cylinder screen printing machines, the present invention does not have any synchronization problem when the screen carrier is lifted to decouple from the print cylinder or lowered to couple with the print cylinder.
  • a further object of the present invention is to provide a servo-driven cylinder screen printing machine that includes two independent driving sources for two lateral sides of the screen carrier, so that the left and the right side of the screen carrier can be synchronously or independently driven according to actual need in the printing operation, and different driving parameters can be input to electronically correct any deviation in the moving distance of the screen carrier.
  • the servo-driven cylinder screen printing machine includes a machine frame, a print cylinder, at least one direct-drive servo mechanism, a screen carrier, and at least one linear servo mechanism. Further, a feeder and a printed sheet collecting unit are correspondingly installed at a feeding and a delivering end of the machine frame, respectively, so that the cylinder screen printing machine can perform massive and accurate printing on a large number of printing material sheets.
  • An infeed table is mounted in a front portion of the machine frame to form a feeding zone, and is connected to the feeder.
  • a delivery table is mounted in a rear portion of the machine frame to form a delivering zone, and is connected to the printed sheet collecting unit. Between the feeding zone and the delivering zone of the machine frame, there is formed a printing zone.
  • the print cylinder is installed in the printing zone of the machine frame and has a rotary shaft and a cylinder body mounted on the rotary shaft.
  • the direct-drive servo mechanism is connected to at least one end of the rotary shaft of the print cylinder to form a direct-drive device for driving the rotary shaft to rotate at precisely controlled rotational speed.
  • the screen carrier is located above the printing zone of the machine frame and adjacent to a surface of the cylinder body of the print cylinder.
  • the linear servo mechanism is connected to the screen carrier to form another direct-drive device for driving the screen carrier to linearly move above the machine frame.
  • one direct-drive servo mechanism configured as a servo motor and directly installed on an end of the rotary shaft of the print cylinder
  • two linear servo mechanisms configured as two linear motors separately mounted to the left and the right side of the screen carrier for driving the screen carrier to linearly move reciprocatingly between the feeding zone and the delivering zone.
  • the two lateral side of the screen carrier can be independently driven by the two linear servo mechanisms.
  • the delivery table includes a first conveyor located adjacent to the printed sheet collecting unit and a second conveyor located between the first conveyor and the print cylinder.
  • the first conveyor is connected to and brought by a first driving motor to generate a first conveying speed the same as a synchronous speed of the printed sheet collecting unit; and the second conveyor is connected to and brought by a second driving motor to generate a second conveying speed that is properly changeable and adjustable according to a speed of the print cylinder or the delivery table.
  • the cylinder screen printing machine may further include a locating device provided between the infeed table and the print cylinder; and the locating device is connected to and brought by a synchronous motor to perform print material sheet alignment and gripper movement.
  • the feeder includes a sheet box for holding a stack of the printing material sheets therein, a pick-up device located above the sheet box for separating the sheets from the sheet stack one by one, an infeed transfer section located at one side of the pick-up device corresponding to the infeed table, a third driving motor connected to the pick-up device for driving the pick-up device to separate the sheets from the sheet stack one by one, and a fourth driving motor connected to the infeed transfer section for driving the infeed transfer section to operate.
  • the fourth driving motor is also connected to the infeed table for synchronously driving the infeed table to convey the printing material sheets.
  • the servo-driven cylinder screen printing machine of the present invention is characterized in using two independent direct-drive devices, namely, the direct-drive servo mechanism and the linear servo mechanisms, to rotate the print cylinder and move the screen carrier, respectively, so that the print cylinder and the screen carrier work coordinately to complete the printing operation.
  • the present invention effectively saves the tooth racks, gears and cams inside the conventional screen printing machines to avoid the negative effects caused by the backslashes in the tooth drive via gears and tooth racks and enable largely upgraded screen printing accuracy.
  • the screen carrier of the present invention is connected to two mutually independent direct-drive linear servo mechanisms, and therefore, there is not any synchronization problem when the screen carrier is lifted to decouple from the print cylinder or lowered to couple with the print cylinder.
  • the present invention includes two independent driving sources for two lateral sides of the screen carrier, the left and the right side of the screen carrier can be synchronously or independently driven according to actual need in the printing operation. Different driving parameters can be input to electronically correct any deviation in the moving distance of the screen carrier.
  • Figs. 3 and 4 are side and end sectional views, respectively, of a servo-driven cylinder screen printing machine 20 according to a preferred embodiment of the present invention.
  • the servo-driven cylinder screen printing machine 20 includes a machine frame 21, a print cylinder 22, a direct-drive servo mechanism 23, a screen carrier 24, and two linear servo mechanisms 25.
  • the machine frame 21 has two opposite lateral side walls, which respectively have an elongated rack 211 mounted on along a top thereof.
  • the racks 211 respectively internally define a displacement rail 212 facing toward an internal space of the machine frame 21, and the two linear servo mechanisms 25 are separately installed in the displacement rails 212.
  • a feeder 30 is correspondingly installed at a feeding end of the machine frame 21 and a printed sheet collecting unit 40 is correspondingly installed at a delivering end of the machine frame 21, so that the screen printing machine 20 can be used to perform massive and accurate printing on a large number of printing material sheets 50.
  • the printing material sheet 50 is also briefly referred to as the sheet 50 herein.
  • the print cylinder 22 has a rotary shaft 221, which is installed in the printing zone 215 in the machine frame 21, and a cylinder body 222 mounted on a middle section of the rotary shaft 221.
  • the direct-drive servo mechanism 23 is located outside the machine frame 21 and mounted to an end of the rotary shaft 221 of the print cylinder 22 to form a direct-drive device for directly driving the whole print cylinder 22 to pivotally rotate.
  • the direct-drive servo mechanism 23 is configured as a servo motor.
  • the servo motor has an encoder (not shown) driven by pulse and digital program to control the rotary shaft 221 to rotate at an accurate and stable speed.
  • Such servo motor has many advantages, such as considerably quick acceleration and deceleration response time, quick movement, and big output power.
  • the screen carrier 24 is located above the printing zone 215 of the machine frame 21 and adjacent to the surface of the cylinder body 222, so that the screen carrier 24 and the cylinder body 222 together form a means to print on the sheet 50. Further, the screen carrier 24 is connected at two opposite lateral sides to the two linear servo mechanisms 25. Therefore, the linear servo mechanisms 25 installed in the displacement rails 212 formed by the two racks 211 of the machine frame 21 directly drive the screen carrier 24 to move, and form another two direct-drive devices.
  • the two linear servo mechanisms 25 can independently drive the left and the right side of the screen carrier 24 according to the actual need in the printing operation. And, different driving parameters can be input to electronically correct the moving distance, so that any deviation in printing length, either too long or too short, and any skew printing can be automatically compensated.
  • linear servo mechanisms 25 are only illustrative. That is, according to the present invention, it is also possible to mount only one linear motor (not shown) to a center of the screen carrier 24 to serve as the linear servo mechanism 25 for the screen printing machine 20 of the present invention, so that the screen carrier 24 is driven at its center to linearly reciprocatingly move between the feeding zone 213 and the delivering zone 214.
  • the delivery table 27 includes a first conveyor 271 located adjacent to the printed sheet collecting unit 40 and a second conveyor 272 located between the first conveyor 271 and the print cylinder 22.
  • the first conveyor 271 is connected to and brought by a first driving motor 273 to generate a first conveying speed the same as a synchronous speed of the printed sheet collecting unit 40.
  • the second conveyor 272 is connected to and brought by a second driving motor 274 to generate a second conveying speed that is properly changeable and adjustable according to the speed of the print cylinder 22 or the delivery table 27.
  • a locating device 28 is further provided between the infeed table 26 and the print cylinder 22.
  • the locating device 28 is connected to and brought by a synchronous motor 281 to perform sheet alignment, gripper movement and other operations among which synchronization is required.
  • the servo-driven cylinder screen printing machine of the present invention is characterized in using two independent direct-drive devices, namely, the direct-drive servo mechanism and the linear servo mechanisms, to rotate the print cylinder and move the screen carrier, respectively, so that the print cylinder and the screen carrier work coordinately to complete the printing operation.
  • the servo-driven cylinder screen printing machine of the present invention also uses the encoder driven by pulse and digital program to ensure timely and accurate driving of all transfer and driving shafts. With the present invention, it is able to overcome the drawbacks of the conventional screen printing machines that use a very complicated driving system involving gear sets, chains and various complicated and unchangeable cam structures.
  • the present invention uses different servo motors to drive different mechanisms, which enables not only simplified overall structure to avoid complicated mechanism design, but also automatic compensation of any deviation in printing length, either too long or too short, and any skew printing.
  • the present invention also effectively saves the tooth racks and gears inside the conventional screen printing machines to reduce the labor and time needed to assemble the machine.
  • the present invention avoids (1) the negative effects caused by the backslashes in the tooth drive via gears and tooth racks, (2) the inertia under high-speed printing operation, (3) the accumulated tolerance produced after assembling of the tooth racks, gears, cams and other parts, and (4) the influences by all kinds of noise and sound to thereby enable largely upgraded screen printing accuracy and increased productivity through automated mass printing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)

Claims (9)

  1. Zylinder-Siebdruckmaschine mit Servoantrieb (20) mit einem Versorger (30) und einer Druckbogensammeleinheit (40) zum Drucken auf Bedruckstoffbögen (5), mit:
    einem Maschinenrahmen (21) einschließlich eines Einlauftischs (26), der in einem Vorderteil des Maschinenrahmens (21) montiert ist, um einen Zufuhrbereich (213) zu bilden, und der mit dem Versorger (30) verbunden ist, einem Auslagetisch (27), der in einem rückwärtigen Teil des Maschinenrahmens (21) montiert ist, um einen Ausgabebereich (214) zu bilden, und der mit der Druckbogensammeleinheit (40) verbunden ist,
    wobei der Auslagetisch (27) folgendes umfasst:
    ein erstes Förderwerk (271), das der Druckbogensammeleinheit (40) benachbart positioniert ist, und das erste Förderwerk (271) mit einem ersten Antriebsmotor (273) verbunden ist und von diesem dazu gebracht wird, eine erste Transportgeschwindigkeit zu erzeugen, dieselbe wie eine synchrone Geschwindigkeit der Druckbogensammeleinheit (40), und
    ein zweites Förderwerk (272), das mit einem zweiten Antriebsmotor (274) verbunden ist und von diesem dazu gebracht wird, eine zweite Transportgeschwindigkeit zu erzeugen, die sachgerecht veränderbar und verstellbar ist, entsprechend einer Geschwindigkeit eines Druckzylinders (22) oder des Auslagetischs (27), und einen Druckbereich (215) zwischen dem Zufuhrbereich (213) und dem Ausgabebereich (214);
    der Druckzylinder (22) ist im Druckbereich (215) installiert und umfasst eine Drehwelle (221) und einen Zylinderkörper (222), der auf die Drehwelle (221) montiert ist, das zweite Förderwerk (272) ist zwischen dem ersten Förderwerk (271) und dem Druckzylinder (22) positioniert;
    mindestens ein Servosystem mit Direktantrieb (23) ist mit einem Ende der Drehwelle (221) des Druckzylinders (22) verbunden, um eine Vorrichtung mit Direktantrieb zum Antrieb der Drehwelle (221) zu bilden, so dass dementsprechend der Zylinderkörper (222) mit genau gesteuerter Rotationsgeschwindigkeit rotiert;
    ein Siebträger (24) ist oberhalb des Druckbereichs (215) des Maschinenrahmens (21) und benachbart zu einer Oberfläche des Zylinderkörpers (222) des Druckzylinders (22) positioniert; und
    mindestens ein lineares Servosystem (25) ist mit dem Siebträger (24) verbunden, um eine weitere Vorrichtung mit Direktantrieb zum Antrieb des Siebträgers (24) zu bilden, zur linearen Bewegung oberhalb des Maschinenrahmens (21);
    wobei der Druckzylinder (22) von dem Servosystem mit Direktantrieb (23) angetrieben wird, um stufenlos in einer Richtung zu rotieren, zum Durchführen von abwechselnden und aufeinanderfolgenden Halt- und Druckbewegungen, und der Siebträger (24) wird von dem mindestens einen linearen Servosystem (25) angetrieben, um sich zum Arbeiten mit dem Druckzylinder (22) zu bewegen, um einen Druckvorgang mit hoher Synchronisationspräzision auszuführen.
  2. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 1, wobei es zwei lineare Servosysteme (25) gibt, die separat an einer linken und einer rechten Seite des Siebträgers (24) installiert sind, zum Antrieb des Siebträgers (24), damit er sich linear zwischen dem Zufuhrbereich (213) und dem Ausgabebereich (214) hin- und her bewegt.
  3. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 2, wobei die beiden linearen Servosysteme (25) unabhängig die linke und die rechte Seite des Siebträgers (24) antreiben.
  4. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 1, wobei es nur ein lineares Servosystem (25) gibt, das in einer Mitte des Siebträgers (24) installiert ist, zum Antrieb des Siebträgers (24), damit er sich linear zwischen dem Zufuhrbereich (213) und dem Ausgabebereich (214) hin- und her bewegt.
  5. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 1, die des Weiteren folgendes umfasst: eine Positioniervorrichtung (28) zwischen dem Einlauftisch (26) und dem Druckzylinder (22); und die Positioniervorrichtung (28) mit einem Synchronmotor (281) verbunden ist und von diesem dazu gebracht wird, die Ausrichtung des Blattes (50) und die Bewegung des Greifers auszuführen.
  6. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 1, wobei der Versorger (30) einen Blattbehälter (31) umfasst, um einen Stapel der Bedruckstoffbögen (50) darin zu halten, eine Aufnahmevorrichtung (32), die oberhalb des Blattbehälters (31) positioniert ist, um die Blätter (50) von dem Blattstapel einzeln zu trennen, einen Zufuhrtransferabschnitt (33), der an einer Seite der Aufnahmevorrichtung (32) positioniert ist, die dem Einlauftisch (26) entspricht, einen dritten Antriebsmotor (34), der mit der Aufnahmevorrichtung (32) verbunden ist, zum Antrieb der Aufnahmevorrichtung (32), um die Blätter (50) von dem Blattstapel einzeln zu trennen, und einen vierten Antriebsmotor (35), der mit dem Zufuhrtransferabschnitt (33) verbunden ist, zum Antrieb des Zufuhrtransferabschnitts (33), zwecks Betriebs.
  7. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 6, wobei der vierte Antriebsmotor (35) auch mit dem Einlauftisch (26) verbunden ist, um den Einlauftisch (26) synchron anzutreiben, um die Bedruckstoffbögen (50) zu befördern.
  8. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 1, wobei das Servosystem (23) mit Direktantrieb ein Servomotor ist.
  9. Zylinder-Siebdruckmaschine mit Servoantrieb (20) nach Anspruch 1, wobei das lineare Servosystem (25) ein Linearmotor ist.
EP14182171.0A 2014-08-25 2014-08-25 Siebdruckmaschine mit Servoantrieb. Active EP2990203B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14182171.0A EP2990203B1 (de) 2014-08-25 2014-08-25 Siebdruckmaschine mit Servoantrieb.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14182171.0A EP2990203B1 (de) 2014-08-25 2014-08-25 Siebdruckmaschine mit Servoantrieb.

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EP2990203A1 EP2990203A1 (de) 2016-03-02
EP2990203B1 true EP2990203B1 (de) 2018-08-08

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3335878B1 (de) * 2016-12-16 2021-02-10 ATMA Champ Ent. Corp. Druckmaschine
CN107891657A (zh) * 2017-09-30 2018-04-10 芜湖蓝博塑胶有限公司 空调塑料壳自动刷标装置
CN108773156A (zh) * 2018-08-01 2018-11-09 广州市申发机电有限公司 一种全自动大圆瓶丝网印刷机
CN113321020A (zh) * 2021-05-10 2021-08-31 上海靓顺数码科技有限公司 一种pcb板印刷上料机台

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Publication number Priority date Publication date Assignee Title
DE4304399A1 (de) * 1993-02-13 1994-08-18 Rk Siebdrucktechnik Gmbh Verfahren zur Steuerung einer Siebdruckzylindermaschine
DE4444189C2 (de) * 1994-08-12 1999-09-09 Leipold Xaver F Gmbh & Co Kg Durch- oder Siebdruckmaschine
WO2006051558A1 (en) * 2004-11-10 2006-05-18 Kameswaran Blasubramanian A servo-synchronized screen printing machine

Non-Patent Citations (1)

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Title
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