JP6485902B2 - Rotary screen printer - Google Patents

Description

  The present invention relates to a rotary screen printing apparatus that performs screen printing using a cylindrical screen plate.

  2. Description of the Related Art Conventionally, a rotary screen printing machine using a rotary screen device is known as a high-speed printing device for printing materials made of a wide range of materials such as cloth and paper. The rotary screen printing machine has a printing method in which ink is pushed out by a squeegee from a through hole formed in a plate surface of a cylindrical screen plate, and the pushed ink is transferred to a printing material.

  In general, the rotary screen device supplies the ink to the impression cylinder side from the small hole disposed inside the screen plate, a cylindrical support member that supports both ends of the screen plate, and the screen plate. It is configured with a squeegee. Hereinafter, a screen having a cylindrical screen plate with end rings attached to both ends is referred to as a rotary screen.

Conventionally, in such a rotary screen printing apparatus, there is known a rotary screen printing apparatus that rotationally drives one of the two support members, that is, one axial side of a cylindrical screen (for example, a patent) Reference 1).
In addition, there is a type in which gears are provided on support members on both sides of a cylindrical screen plate, and the screen plate is rotationally driven from both sides in the axial direction (for example, see Patent Document 2).

JP 2006-321157 A JP 2005-529000 Gazette

  Here, in the rotary screen printing machine, the thickness of the screen plate is becoming thinner due to the distribution of the pattern on the screen plate and the demand for sharpening the pattern in the screen printing. Due to the squeegee's pressing force against the screen, the screen plate may be slightly distorted and twisted.

  In the invention described in Patent Document 1 described above, since one side of the screen plate is rotationally driven, the squeegee is pressed from the inside of the screen plate in order to push ink out of the small holes in the screen plate during printing. Then, there is a difference in rotation between the driving side and the non-driving side, which leads to a twist in the rotation direction of the screen plate, and the right and left registration is shifted, which may cause a decrease in print quality.

  Even in the configuration of Patent Document 2 described above, the screen plate is rotationally driven by a gear mechanism that synchronizes both axial sides of the screen plate (the gears on both axial sides rotate the screen plate in the same phase). However, due to the slight distortion and twist described above, the gear teeth on one side of the screen plate are lifted by the gap of the backlash provided on the gear at most, and the other side of the screen plate is substantially There is a possibility that only one is driven and the drive is not transmitted by the gear on one side.

  Rotating the screen plate on only one side adds to the problem of misalignment between the left and right sides as described above, and also places a heavy load on one side of the screen plate, which ultimately leads to early wear of the screen plate. There was also a problem of shortening the life of the plate.

  In view of the above, an object of the present invention is to provide a rotary screen printing apparatus capable of preventing deterioration in printing quality and shortening of the life of a screen plate.

A rotary screen printing apparatus according to the first invention for solving the above-mentioned problems is
A screen plate having a small hole corresponding to a pattern formed in a cylindrical shape, and a squeegee provided so as to be able to come into contact with the inner peripheral surface of the screen plate; In a rotary screen printing apparatus that extrudes and transfers the extruded ink to a substrate,
A first support member for supporting one end of the screen plate;
A second support member for supporting the other end of the screen plate;
A first drive motor that is drivingly connected to the first support member and rotationally drives the first support member;
A second drive motor that is drivingly connected to the second support member and rotationally drives the second support member;
A first torque detector for detecting torque applied to the first drive motor;
A second torque detector for detecting torque applied to the second drive motor;
The first drive motor is controlled to rotate in synchronism with the apparatus, and the second drive motor is controlled based on the detection results of the first torque detector and the second torque detector. And a controller for controlling the second drive motor so as to output a torque equal to the torque applied to the drive motor.

A rotary screen printing apparatus according to the second invention is
Drive connecting / disconnecting means for connecting / disconnecting driving from the second drive motor to the second support member is provided.

  According to the rotary screen printing apparatus according to the present invention, since the screen plate can be driven on both sides with certainty, the screen plate is prevented from being distorted and twisted, and the occurrence of misregistration is suppressed. In addition, the life of the screen plate can be extended without applying a large load to one side of the screen plate.

It is explanatory drawing which shows the rotary screen printing apparatus which concerns on embodiment of this invention. FIG. 2 is a plan development view of FIG. 1. It is explanatory drawing which shows the relationship between the flame | frame and sub-frame in the rotary screen printing apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the rotary screen printing apparatus which concerns on embodiment of this invention.

  Hereinafter, a rotary screen printing apparatus according to the present invention will be described with reference to the drawings.

The details of one embodiment of the rotary screen printing machine according to the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, in this embodiment, an impression cylinder 100 is rotatably supported between the left and right machine frames 101 and 101, and a screen cylinder 201 is opposed to the impression cylinder 100. Is arranged.

  Although not shown, the impression cylinder 100 is formed with a notch along the axial direction of the impression cylinder 100 on the outer peripheral surface thereof. A plurality of notches are formed at equal intervals along the circumferential direction of the impression cylinder 100 (for example, two locations in the present embodiment). A holding portion such as a nail for holding the printing material is provided in the cutout portion.

  The screen cylinder 201 includes a screen plate 201A formed of a thin plate material obtained by etching a small hole corresponding to a pattern in a cylindrical shape, and two end rings 201B and 201B fixed to both ends (left and right in FIG. 2) of the screen plate 201A. It consists of and. The screen cylinder 201 is supported by the frames 101 and 101 via support members (first and second support members) 202 and 202, screen brackets 203 and 203, and a subframe 204.

  The end ring 201B is a member for reinforcing the screen plate 201A. The end ring 201B is formed with a plurality of (not shown in the figure) notch portions (hereinafter referred to as end ring side notch portions) (not shown) and a pin groove (not shown). The end ring-side notch is an end opposite to the screen plate 201A with respect to the axial direction of the end ring 201B, and is provided on the outer peripheral surface thereof at equal intervals in the circumferential direction. The pin groove is provided between the adjacent end ring side cutout portions, and is cut out in a U shape from the outer peripheral surface toward the axial center. The end ring 201B is supported by the support member 202.

  The support member 202 is a cylindrical member and supports the end ring 201B in a detachable manner. That is, the support member 202 is provided with a plurality of protrusions (two in the present embodiment) (hereinafter referred to as support member side protrusions) (not shown) and pins (not shown). The projecting portion on the support member side is on the end ring 201B side with respect to the axial direction of the support member 202 and at a position corresponding to the inner circumferential surface thereof at equal intervals in the circumferential direction (the same interval as the end ring side notch portion). Is provided. Note that the support member-side protruding portion is shaped to fit into the end ring-side notch. Further, the pin is fixed to the one projecting member side protruding portion.

  By being configured in this manner, first, the end ring 201B is inserted into the hollow portion of the support member 202 with the end ring side notch and the support member side protruding portion aligned in the circumferential direction. The rotary screen 201 is rotated with respect to the support member 202 at a position where the notch portion and the support member side protruding portion do not buffer, and finally, the position of the pin groove and the pin is aligned with respect to the support member 202. By moving the rotary screen 201 in the axial direction and engaging the pin with the pin groove, the rotary screen 201 can be supported by the support member 202 so that the phase thereof matches the phase of the support member 202.

The support member 202 is rotatably supported by the screen bracket 203.
Each of the screen brackets 203 includes a screen support portion 203a that rotatably supports the support member 202, and a motor support portion 203b disposed on the outer side in the radial direction of the screen cylinder 201 with respect to the screen support portion 203a. Has been.

  The screen support portion 203a includes a through hole, and the support member 202 described above is rotatably supported in the through hole. Moreover, the motor support part 203b is formed in a frame shape. A driving main motor (first driving motor) 205 and a driving sub motor (second driving motor) 206 are fixed to one side and the other side of the motor support portion 203b, respectively.

  Here, the drive shafts of the drive main motor 205 and the drive sub motor 206 respectively protrude outward from the motor support portion 203b (see FIG. 2). A gear 207 (hereinafter referred to as a gear on the main motor side) 207 that is coaxial with the drive shaft is provided at the tip of the drive shaft of the drive main motor 205, while at the tip of the drive shaft of the drive sub motor 206. A gear 209 (hereinafter referred to as a sub-motor side gear) 209 that is coaxial with the drive shaft is provided via a clutch 210 as drive connection / disconnection means.

  Further, a gear (hereinafter referred to as a gear of the support member) 202a is also provided on the outer peripheral surface of the support member 202, and a gear 202a of one support member (right side in FIG. 2) and a gear 207 on the main motor side are provided. The other gear (the left side in FIG. 2) 202a and the sub-motor gear 209 are engaged with each other via the intermediate gear 208.

  As a result, the drive of the drive main motor 205 is transmitted to one end of the rotary screen 201 via the main motor side gear 207, the intermediate gear 208, the support member gear 202 a, and the support member 202. The driving of the driving sub motor 206 is transmitted to the other end of the rotary screen 201 via the sub motor side gear 209, the intermediate gear 208, the supporting member gear 202 a, and the supporting member 202. Thereby, the rotary screen 201 can be driven on both sides.

  Note that the driving main motor 205 and the driving sub motor 206 have torque detectors (first torque detector and second torque detector, hereinafter referred to as main motor torque detector and sub motor torque detector, respectively) 205a. 206a (see FIG. 4).

  The screen bracket 203 is supported by the subframe 204 so as to be slidable in the axial direction of the rotary screen 201. Specifically, a rail (not shown) extending along the axial direction of the rotary screen 201 is installed on the subframe 204, and the screen bracket 203 is configured to be movable along the rail. The screen bracket 203 is moved by using a rotary screen position adjusting motor 211.

  That is, a screw 211 b that is rotated by driving the rotary screen position adjusting motor 211 is formed at the tip of the drive rod 211 a of the rotary screen position adjusting motor 211. On the other hand, a block 236 in which a female screw to be screwed into the screw 211b is fixed to one of the screen brackets 203 (right side in FIG. 2). When the screw 211 b is screwed to the block 236, one screen bracket 203 moves in the axial direction of the rotary screen 201 as the rotary screen position adjusting motor 211 is driven. At this time, since the other screen bracket 203 is connected to the one screen bracket 203 via the rotary screen 201, the other screen bracket 203 also follows the movement of the one screen bracket 203 and moves along the axis. Move in the direction.

  Further, the tip of the tension cylinder 212 is fixed to the other screen bracket 203. The tension cylinder 212 adjusts the axial tension of the rotary screen 201, and presses the other screen bracket 203 to the opposite side of the one screen bracket 203. Thereby, the rotary screen 201 can be made into the state to which the tension | tensile_strength was added to the axial direction.

  The sub frame 204 is swingably supported by the machine frame 101 via pins 233 fixed to the machine frame 101 by first connecting brackets 204a formed on both sides in the axial direction.

As shown in FIGS. 1 and 3, the second link bracket 204b formed on the other axial side of the subframe 204 (the left side in FIG. 3) includes a first link member 213 and a second link member. A screen cylinder attaching / detaching cylinder 216 is connected via 214 and the third link member 215. The screen barrel attaching / detaching cylinder 216 has a base end portion supported by the machine frame 101 via a pin 217 so as to be swingable.
More specifically, second connecting brackets 204b are formed at both axial ends of the subframe 204, and first link members 213 are respectively connected to the second connecting brackets 204b via pins 218. The first link member 213 is connected to the free end portion of the second link member 214 via a pin 219, and the base end portion of the second link member 214 is rotated. It is fixed to the shaft 220.

  Here, the first link member 213 and the second link member 214 are disposed inside the left and right machine frames 101, respectively. The rotary shaft 220 passes through the machine frame 101 and is rotatably supported by the machine frames 101 and 101 so that the axial direction thereof is parallel to the axial direction of the rotary screen 201, and at least one end thereof (the left side in FIG. 3). ) Protrudes outside the machine frame 101.

  Further, on the outside of the machine frame 101, the base end portion of the third link member 215 is fixed to the one end of the rotating shaft 220. The free end portion of the third link member 215 is connected to the drive rod 216a of the screen cylinder attaching / detaching cylinder 216 via a pin 221 so as to be swingable. Further, a stopper 222 that restricts the swing of the sub frame 204 toward the impression cylinder 100 is disposed on the side surface of the third link member 215 so as to face the side surface.

Further, as shown in FIGS. 1 and 2, ink (or varnish) 1 inside the screen plate 201A is supplied into the screen cylinder 201 described above from the small holes of the screen plate 201A to the impression cylinder 100 side. A squeegee 223 including a blade (squeegee main body) 223A and a squeegee bar 223B as a support for supporting the blade 223A is disposed.
Both ends of the squeegee 223 are swingably supported by the subframe 204 via squeegee support members 224 and 224 and support plates 225 and 225, respectively.

The squeegee support member 224 is a member that swingably supports the squeegee bar 223B.
The support plate 225 is a plate body, and holds the squeegee support member 224 at one corner thereof. A drive rod 226a of the squeegee attaching / detaching cylinder 226 is swingably connected to the other corner of the support plate 225, and the other corner is pivotally supported by the pin 227 while being in contact with the positioning pin 232. An abutting surface 225a is provided.

  The base end portion of the squeegee attaching / detaching cylinder 226 is supported by a third connecting bracket 204c formed at both axial ends of the subframe 204 so as to be swingable via a pin 228, and the drive rod 226a is interposed via a pin 229. The support plate 225 is swingably connected. The squeegee attaching / detaching cylinder 226 is provided to bring the squeegee 223 (more specifically, the blade 223A) into contact with or away from the inner peripheral surface of the screen plate 201A, and the drive rod 226a of the squeegee attaching / detaching cylinder 226 is provided. Is moved forward and backward, the support plate 225 swings and the squeegee 223 comes into contact with or separates from the inner peripheral surface of the screen plate 201A.

  The pins 227 are fixed to fourth connecting brackets 204d formed at both axial ends of the subframe 204, and the positioning pins 232 are fifth connecting brackets 204e formed at both axial ends of the subframe 204. It is fixed to.

  In addition to the main motor torque detector 205a and the sub motor torque detector 206a described above, the control device 300 of the rotary screen printing apparatus according to the present embodiment includes, as shown in FIG. An operation signal is input and a detection signal from the timer 231 is input.

Further, the control device 300 drives and controls the driving main motor 205, the driving sub motor 206, the clutch 210, the tension cylinder 212, the squeegee attaching / detaching cylinder 226, the screen cylinder attaching / detaching cylinder 216, and the timer 231.
Note that the control device 300 controls the driving main motor 205 and the driving sub motor 206 so that the driving main motor 205 and the driving sub motor 206 output predetermined torque based on the detection results of the main motor torque detector 205a and the sub motor torque detector 206a. It is assumed that a torque helper function capable of controlling the motor 205 and the driving sub motor 206 is provided.

  The flow of attaching the rotary screen 201 in the rotary screen printing apparatus according to this embodiment configured as described above will be described below. In the rotary screen printing apparatus according to the present embodiment, when the rotary screen 201 is attached, first, end rings 201B are attached to both ends of the screen plate 201A, and then one end ring 201B of the screen plate 201A is attached to one side support member. Attach to 202. Subsequently, the support member 202 on the other side is moved inward, the screen plate 201A is rotated to perform phase alignment with the end ring 201B on the other side of the screen plate 201A, and the end ring 201B is attached to the support member 202.

  Thereafter, the tension cylinder 212, the driving main motor 205, and the driving sub motor 206 are turned on by the control device 300, and the timer 231 starts counting. At this time, the driving main motor 205 and the driving sub motor 206 are driven in synchronization.

  As a result, the rotary screen 201 is in a tensioned state, and the driving main motor 205 and the driving sub motor 206 are driven. At this time, the rotary screen 201 is driven to rotate through the gear 207 and the intermediate gear 208 on the main motor side and the gear 202a of the support member 202. Further, as the rotary screen 201 rotates, the gear 202a and intermediate gear of the support member 202 are rotated. The gear 209 on the sub motor side rotates through 208. Since the clutch 210 is disconnected from the shaft of the driving sub motor 206, the driving shaft of the driving sub motor 206 rotates independently.

  Subsequently, when the timer 307 measures time for a preset first set time, the control device 300 turns on the connection with the drive shaft of the driving sub motor 206 of the clutch 210 and drives using the torque helper function. The sub motor 206 is controlled so that its torque is the same as that of the driving main motor 205. As a result, the gear 209 on the sub motor side is connected to the drive shaft of the drive sub motor 206, and the drive sub motor 206 is controlled to output the same torque as the drive main motor 205. The main motor 205 for driving and the sub motor 206 for driving are respectively driven to rotate.

  When the timer 231 keeps timing for the second set time, the controller 300 stops the driving main motor 205 and the driving sub motor 206. Thereby, the attachment of the rotary screen 201 is completed.

  During printing, the control device 300 controls the rotation of the driving main motor 205 in synchronization with the printing machine (printing machine) based on the detection signal of the printing machine encoder 230, and is the same as the driving main motor 205 by the torque helper function. The rotation of the driving sub motor 206 is controlled so as to output the torque.

  According to the rotary screen printing machine according to the present embodiment configured as described above, both ends of the rotary screen 201 can be reliably rotated by the driving main motor 205 and the driving sub motor 206, so that the ink is printed during printing. Even if the squeegee is pressed from the inside of the screen plate to extrude it from the small holes in the screen plate, there will be no shift in rotation on both sides of the screen plate 201A, and the left and right registration will be prevented from shifting and the print quality will be reduced. In addition, a large load is not applied to only one end of the screen plate 201A when the squeegee 223 is attached to the screen plate 201A or during printing, and the life of the screen plate 201A can be extended.

  In addition, after the rotary screen 201 is driven on one side for a predetermined time by the drive main motor 205, the connection with the drive shaft of the drive sub motor 206 of the clutch 210 is turned ON, and the drive sub motor 206 is the same as the drive main motor 205. By controlling to be torque, even if the reference position in the circumferential direction is slightly shifted when attaching the end ring 201B to the screen plate 201A, it is possible to prevent the left and right registers from being shifted due to backlash. can do.

  The present invention is suitable for application to a rotary screen printer.

DESCRIPTION OF SYMBOLS 100 Impression cylinder 101 Machine frame 201 Screen cylinder 201A Screen plate 201B End ring 202 Bearing member 202a Bearing member gear 203 Screen bracket 203a Screen support part 203b Rotating shaft support part 204 Subframe 204a First connection bracket 204b Second Connecting bracket 204c Third connecting bracket 204d Fourth connecting bracket 204e Fifth connecting bracket 205 Driving main motor 205a Main motor torque detector 206 Driving sub motor 206a Sub motor torque detector 207, 208, 209 Gear 210 Clutch 211 Rotary screen position adjusting motor 212 Tension cylinder 213 First link member 214 Second link member 215 Third phosphorus Member 216 Screen cylinder attaching / detaching cylinder 217, 218, 219, 221, 227, 228, 229, 233 Pin 220 Rotating shaft 222 Stopper 223 Squeegee 223A Blade 223B Squeegee bar 224 Squeegee supporting member 225 Support plate 226 Squeegee attaching / detaching cylinder 226a Drive rod 230 This machine Encoder 231 Timer 232 Positioning pin

Claims (2)

A screen plate having a small hole corresponding to a pattern formed in a cylindrical shape, and a squeegee provided so as to be able to come into contact with the inner peripheral surface of the screen plate; In a rotary screen printing apparatus that extrudes and transfers the extruded ink to a substrate,
A first support member for supporting one end of the screen plate;
A second support member for supporting the other end of the screen plate;
A first drive motor that is drivingly connected to the first support member and rotationally drives the first support member;
A second drive motor that is drivingly connected to the second support member and rotationally drives the second support member;
A first torque detector for detecting torque applied to the first drive motor;
A second torque detector for detecting torque applied to the second drive motor;
The first drive motor is rotationally controlled in synchronism with the apparatus, and the second drive motor is controlled by the first torque detector and the second torque detector based on the detection results of the first torque detector. A rotary screen printing apparatus comprising: a control device that controls the second drive motor so as to output a torque equal to a torque applied to the drive motor. 2. The rotary screen printing apparatus according to claim 1, further comprising drive connection / disconnection means for connecting / disconnecting drive from the second drive motor to the second support member.

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