JP2017140744A - Screen printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printer capable of enhancing a space efficiency in a printer frame.SOLUTION: A screen printer comprises: a support frame 26 for supporting a screen frame 28, which reciprocates along a transfer direction of a print sheet with regard to a print barrel below. Racks 31 are disposed on both sides of the support frame 26, while pinions 33 are disposed on output shafts of drive motors disposed on both sides of the printer frame, so that the pinions 33 are engaged with the respective racks 31. Thereby, the drive motor drives the support frame 26 to reciprocate.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a screen printing machine in which a screen frame is moved with respect to a printing cylinder.

  This type of screen printing machine is disclosed in Patent Document 1. In the screen printing machine of Patent Document 1, a drive motor is installed in the printing machine frame. The rotation of the drive motor is transmitted to the shaft through a transmission system such as a belt. This shaft extends in the direction perpendicular to the moving direction of the screen frame of the screen printing machine, that is, the screen frame, and a transmission system such as a belt is provided between both ends of the plate frame and both sides of the transport frame that supports the plate frame. Yes. Accordingly, the rotation of the drive motor is transmitted to the shaft, the rotation of the shaft is transmitted to the transmission systems on both sides of the transport frame, and the transport frame is reciprocated while supporting the plate frame.

JP-A-9-29932

  In the screen printing machine of Patent Document 1, since the drive motor is located in the printing machine frame, the transmission system between the drive motor and the shaft is also located in the printing machine frame. The space in the machine frame becomes narrower, and the space efficiency of the space becomes worse. In addition, the shaft extends in an upper part of the printing press frame so as to lie in a state orthogonal to the moving direction of the transport frame. For this reason, it is necessary to install the coaxial at a position outside the moving range of the transport frame so that the shaft does not hinder the movement of the transport frame, which is a limiting factor in designing the printing press. Furthermore, since the transmission system is provided between the drive motor and the shaft, the number of parts increases and the configuration becomes complicated.

  The present invention has been made paying attention to such problems existing in the prior art, and an object thereof is to provide a screen printing machine capable of improving the space efficiency in the printing machine frame.

  In order to achieve the above object, in the present invention, in the screen printing machine in which the support frame on which the screen frame is supported is reciprocated along the print sheet conveyance direction with respect to the lower printing cylinder, the screen Racks are provided on both sides of the frame, pinions are provided on output shafts of drive motors provided on both sides of the frame, and the pinions are engaged with the racks.

  In the above configuration, the drive motor can be disposed outside the printing machine frame. Therefore, the space efficiency of the internal space of the printing press frame can be improved. In addition, a rack and a pinion may be provided between the motor and the support frame, and the number of parts is small and the configuration is simple.

  The present invention has an effect of improving the space efficiency of the internal space of the printing press frame.

FIG. 3 is a perspective view of a screen printing machine with an internal structure omitted. A side view of a screen printing machine. The front view which shows a printing cylinder. The rear view of a screen printing machine. Sectional drawing which shows a squeegee doctor unit. The top view which shows the related structure of a screen frame. The simplified top view which shows a support frame. The partial front view which shows the related structure of the support frame in the state in which the support frame was arrange | positioned in the home position. The partial front view which shows the related structure of the support frame in the state by which the support frame was arrange | positioned in the intermediate position. The partial front view which shows the related structure of the support frame in the state by which the support frame is arrange | positioned in the movement end position. The top view which shows a conveyance unit. Sectional drawing which shows the state by which the conveyance unit was arrange | positioned in the upper position. Sectional drawing which shows the state by which the conveyance unit is arrange | positioned in the drooping position. The simplified front view which shows a conveyance unit. The simplified sectional view showing a holding unit. The top view which shows a cover unit and an intake unit. The partial side view which shows a cover unit and an intake unit. The partial front view which shows a cover unit and an intake unit. The partial rear view which shows an intake unit. The simplified front view which shows the closed state of a cover unit. The simplified front view of the cover unit which shows the state which open | released the movement area | region of the screen frame. The simplified front view of the cover unit which shows the state which open | released the upper surface of the printing machine flame | frame.

(Embodiment)
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the printing machine frame 21 includes a frame bottom wall portion 211 and frame side wall portions 212 on both sides thereof. In FIG. 1, the internal structure of the printing press is omitted. As shown in FIG. 3, the printing cylinder 22 is rotatably supported between the upper portions of the frame side wall portions 212 via bearings 223. A rotation drive motor 24 composed of a servo motor is supported on the outer surface of one frame side wall 212 via a bracket 23, and the motor shaft is directly connected to the central axis of the printing cylinder 22. Then, the printing cylinder 22 is intermittently rotated in one direction by driving of the rotation driving motor 24, and the printing sheet α shown in FIG. 7 is intermittently conveyed one by one by this intermittent rotation.

  As shown in FIGS. 1 and 4, the frame side wall portion 212 includes a main body 213 and an arm portion 214 protruding forward from the upper end of the main body 213. As shown in FIGS. 5 and 6, a guide rail 25 is laid on the upper ends of the frame side wall portions 212 from the main body 213 to the arm portion 214. A support frame 26 is received by the guide rail 25 so as to be movable on both sides thereof. A screen frame 28 for extending a screen 27 is detachably supported inside the support frame 26. The printing cylinder 22 is disposed at a printing position by the screen 27 on the lower side of the moving region of the support frame 26.

  As shown in FIGS. 6 and 7, racks 31 are fixed to both side surfaces of the support frame 26. A frame moving drive motor 32 that can rotate forward and backward is fixed to the outer side surfaces of both frame side wall portions 212, and a pinion 33 that meshes with the rack 31 is attached to the motor shaft. The frame moving drive motor 32 drives the support frame 26 along the guide rail 25 through the engagement between the pinion 33 and the rack 31 as shown in FIGS. It is reciprocated between (the right end position shown in FIG. 8) and the tip position of the arm portion 214.

  As shown in FIGS. 1, 4, and 5, a support column 41 is erected on the upper end surface of the frame side wall 212 of the printing machine frame 21, and a beam member 42 is installed between the upper ends of the support columns 41. Has been. Both support pillars 41 are provided with guide rails 43, and a lifting body 44 is supported on the guide rails 43. An elevating drive cylinder 45 as an air cylinder driving means is attached to the upper end of the support column 41, and its piston rod 451 is connected to the elevating body 44, and the elevating body 44 is guided by driving of the elevating drive cylinder 45. It is raised and lowered along the rail 43.

  The elevating body 44 is equipped with elevating drive motors 48 and 49 made of servomotors, and the elevating members 50 and 51 are raised and lowered by the elevating drive motors 48 and 49. Support bars 52 and 53 are installed between the left and right elevating members 50 and 51, and a squeegee 54 and a doctor 55 are supported on the support bars 52 and 53. The squeegee 54 and the doctor 55 are arranged at a printing position by the screen 27 on the upper side of the moving area of the support frame 26. Then, the squeegee 54 and the doctor 55 are moved up and down separately in synchronization with the reciprocating movement timing of the support frame 26 by driving of the lift drive motors 48 and 49. A squeegee / doctor unit 56 is constituted by the elevating body 44, elevating drive motors 48 and 49, elevating members 50 and 51, support bars 52 and 53, and the like.

  As shown in FIGS. 11 to 14, a drive-side support shaft 61 and intermediate shafts 60, 63, and 64 are rotatably supported between the front end portions of the frame side wall portion 212. An undulating drive cylinder 73 is rotatably supported on the front end portions of both side wall portions 212 via a shaft 74, and both lower surfaces of the board 62 are connected to the piston rod 731 via shafts 75. A driven support shaft 65 is supported at the front end of the board 62. The conveyor belt 66 is supported by the drive side support shaft 61 and the driven side support shaft 65, and the intermediate portion of the conveyor belt 66 is supported by the intermediate shafts 60 and 64. One frame side wall 212 supports a conveyance drive motor 67, and pulleys 68 and 69 and a belt 71 are interposed between the output shaft of the conveyance drive motor 67 and one end of the drive-side support shaft 61. In this case, the conveyance belt 66 is moved in the conveyance direction of the print sheet α by driving the conveyance drive motor 67. A transport unit 76 is constituted by the drive side support shaft 61, the driven side support shaft 65, the intermediate shafts 60 and 64, the board 62, the undulation drive cylinder 73, the transport drive motor 67, and the like.

  As the piston rod 731 of the hoisting drive cylinder 73 moves up and down, the transport unit 76 is hoisted and arranged at the horizontal position shown in FIG. 12 and the drooping position shown in FIG. 13 rotated 90 degrees downward from the horizontal position. Is done. In the hanging position, the conveyor belt 71 is also supported by the intermediate shaft 63.

  As shown in FIG. 15, a holding groove 77 extending in the vertical direction and opening downward is formed at the tips of both arm portions 214, and the driven-side support shaft 65 in the horizontal state is formed in the holding groove 77. The end projections of are accommodated. An actuator 78 is attached to the distal ends of both arm portions 214, and an armature 79 of the actuator 78 faces the lower end opening of the holding groove 77. When the transport unit 76 is arranged at the horizontal position, the state is detected by a sensor (not shown), and the armature 79 is projected by the operation of the actuator 78 based on the detection. For this reason, the lower end opening of the holding groove 77 is closed by the armature 79, the section 651 having a quadrangular cross section of the driven support shaft 65 is held in the holding groove 77, and the transport unit 76 is held in the horizontal position. A holding unit 80 is constituted by the member having the holding groove 77, the actuator 78, and the like.

  As shown in FIGS. 16 and 17, guide rails 81 are laid on the upper end surfaces of both side wall portions 212 on both the front and rear sides of the support column 41. The guide rail 81 is guided to move the first cover 83 on the wheels 84 on both sides thereof. A second cover 86 is supported on the frame side wall portion 212 via the slide rail 85 so as to be movable in the same direction as the movement direction of the first cover 83 so as to be adjacent to the first cover 83. The first cover 83 and the second cover 86 constitute a cover unit 87. A stay 95 is fixed to the frame side wall 212, and a slide rail 96 is interposed between the stay 95 and the second cover 86. A slide rail 97 is interposed between the first cover 83 and the second cover 86. The first cover 83 overlaps the second cover 86, and the second cover 86 is accommodated in the first cover 83.

  Then, as shown in FIG. 20, the second cover 86 is not housed in the first cover 83, and the cover unit 87 is in the extended state of the first and second covers 83, 86. It will be in the closed state which covers the upper part of a movement area | region. As shown in FIG. 21, when the first cover 83 overlaps the second cover 86, the movement area of the support frame 26 during printing is opened. As shown in FIG. 22, when the first cover 83 overlaps the second cover 86 and the covers 83 and 86 are moved to the outside of the printing machine frame 21, the upper part of the printing machine frame 21 is entirely covered. Opened. In the fully open state, the first and second covers 86 are supported by the stay 95 via the slide rail 96.

  As shown in FIGS. 16 to 19, a vent hole 88 as an opening made up of a plurality of small holes is formed on one side wall 831 of the first cover 83. On the other hand, an intake unit 89 is mounted on the frame side wall portion 212 via legs 891. The air intake unit 89 includes a blower 91 incorporating a motor and a fan (not shown) in a wind box 90. The air box 90 has an air inlet 93 as an opening located on the first cover 83 side, and a duct 94. , And an exhaust port 912 connected thereto. When the first cover 83 is disposed at the closed position shown in FIGS. 16 and 20, the vent 88 and the intake port 93 communicate with each other through a narrow space in the seal 92. When the blower 91 is operated in this state, the air in the cover unit 87 is sucked into the wind box 90 through the vent hole 88 and the intake port 93 and is exhausted through the exhaust port 912 and the duct 94.

  Handrails 101 and 102 are provided on both sides of the moving area of the cover unit 87 and between the upper ends of the support columns 41, respectively, and the operator holds the handrails 101 and 102 with one hand to clean the screen frame 28. Etc. can be performed stably.

A cover 103 is detachably provided at the upper end of the frame side wall 212.
On the front surface of the support column 41 on the front side, an operation panel 104 having various operation buttons and a display device 105 including a liquid crystal panel for displaying various information are installed.

The printer configured as described above operates as follows.
In the state before the printing operation is started, the cover unit 87 is disposed at a position covering the reciprocating range of the support frame 26. Further, the transport unit 76 is disposed at the horizontal position and is held at that position by the holding unit 80. Further, the elevating body 44 is arranged at the lower position by the elevating drive cylinder 45, and in this state, the squeegee 54 and the doctor 55 are arranged at the upper standby position.

  When the printing operation is started, the printing sheets α are conveyed one by one by the intermittent rotation of the printing cylinder 22. At the same time, the support frame 26 is reciprocated through the engagement between the rack 31 and the pinion 33 driven by the frame movement drive motor 32, and the squeegee 54 and the doctor 55 are moved up and down at different timings. Printing is performed on the print sheet. The printing sheet α for which printing has been completed is sent to the next process on the downstream side of the screen printer by the transport unit 76.

  At this time, volatile substances drift from the ink on the screen frame 28 into the cover unit 87. The volatile substances in the cover unit 87 are sucked by the intake unit 89 and exhausted to the outside through the duct 94. Is done.

When the printing operation is completed, the lifting / lowering body 44 is lifted from the standby position by the lifting / lowering drive cylinder 45, and the squeegee 54 and the doctor 55 are disposed at the retracted position.
When performing maintenance such as cleaning on the upper surface side of the support frame 26 and the screen frame 28, the first cover 83 of the cover unit 87 is moved to a position overlapping the second cover 86 as shown in FIG. Then, maintenance work can be performed by opening the upper part of the support frame 26 and the screen frame 28. When the upper portion of the printing machine frame 21 is fully opened and the support frame 26 and the screen frame 28 are further opened upward, as shown in FIG. 22, the first cover 83 and the second cover in an overlapping state are used. 86 may be moved to the outer end position shown in FIG.

  On the other hand, when the printing operation is stopped, as shown in FIG. 13, if the transport unit 76 is moved to the hanging position by the undulating drive cylinder 73, the space between the arm portions 214 of the frame side wall portion 212 is opened. The operator can enter between the arm portions 214 and perform maintenance or the like. Further, when the transport unit 76 is in the suspended state, as shown in FIG. 10, if the support frame 26 that supports the screen frame 28 is moved to the moving end on the distal end side of the arm portion 214, the operator can move the arm portion 214. It is possible to sink into the lower side of the screen frame 28 and perform maintenance on the lower surface of the screen frame 28.

The present embodiment has the following effects.
(1) A rotation drive motor 24 for rotating the printing cylinder 22 is supported by the frame side wall 212 of the printing machine frame 21, and the output shaft of the motor 24 is directly connected to the printing cylinder 22. For this reason, it is not necessary to provide the rotary drive motor 24 for rotating the printing cylinder 22 or the power transmission mechanism between the rotation drive motor 24 and the printing cylinder 22 in the printing machine frame 21. Therefore, it is possible to secure a sufficient space for mounting other components in the printing machine frame 21 and avoid the trouble of maintaining the rotation drive motor 24 and the power transmission mechanism inside the printing machine frame 21. it can.

  (2) Since the rotation drive motor 24 is directly connected to the printing cylinder 22 and no power transmission mechanism is interposed between them, backlash and power transmission loss between the rotation drive motor 24 and the printing cylinder 22 are avoided. be able to. Accordingly, the printing cylinder 22 can be rotated at an accurate timing and speed by rotating the printing cylinder 22 at an accurate timing and speed, which can contribute to high-precision printing. Further, since the rotation drive motor 24 and the printing cylinder 22 are directly connected, a complicated power transmission mechanism between them is not necessary, and the configuration is simplified.

  (3) The frame movement drive motor 32 for driving the conveyance of the support frame 26 is supported on the outer side surface of the frame side wall portion 212. As a result, unlike the case where the frame movement drive motor 32 is provided inside the printing press frame 21, a space for mounting other components in the printing press frame 21 is secured with a margin as described above. In addition, the drive motor and the power transmission mechanism can be maintained inside the printing machine frame 21. Accordingly, it is possible to avoid the troublesome maintenance in the printing machine frame 21.

  (4) Since the power transmission mechanism between the support frame 26 and the frame movement drive motor 32 is only the rack 31 and the pinion 33, the configuration of the power transmission mechanism can be simplified and compact, and the influence of backlash can be reduced. It can be reduced and can contribute to high-precision printing.

  (5) A support column 41 that supports the squeegee / doctor unit 56 is supported by the upper end of the frame side wall 212 of the printing machine frame 21. The support column 41 is provided with a lift drive cylinder 45 that lifts and lowers both the squeegee 54 and the doctor 55 integrally, and lift drive motors 48 and 49 that lift and lower the squeegee 54 and the doctor 55 individually. Therefore, it is not necessary to provide an actuator for raising and lowering the squeegee 54 and the doctor 55 integrally or independently, and a power transmission mechanism between the actuator and the squeegee 54 and the doctor 55 inside the printing press frame 21. For this reason, the configuration is simplified, and a space for mounting other components in the printing machine frame 21 can be secured with sufficient margins, and the actuator and the power transmission mechanism are maintained inside the printing machine frame 21. Such complexity can be avoided.

  (6) As described above, the support column 41 includes the lift drive cylinder 45 that lifts and lowers both the squeegee 54 and the doctor 55 integrally, and the lift drive motors 48 and 49 that lift and lower the squeegee 54 and the doctor 55 individually. Is provided. For this reason, the operation timing of the squeegee 54 and the doctor 55 can be controlled with high accuracy without being affected by the backlash, and it is effective for improving the printing speed and the printing quality.

  (7) A conveyance unit 76 having 66 having a conveyance belt is arranged at a drooping position rotated 90 degrees from an upper position which is a conveyance operation position. Therefore, in a state where the transport unit 76 is disposed at the hanging position, an operator can enter between the arm portions 214 of the printing machine frame 21. For this reason, the operator can approach various mechanisms such as the squeegee 54 and the doctor 55, and can easily perform maintenance such as cleaning. Further, if the support frame 26 is moved to the distal end side of the arm portion 214, maintenance such as cleaning of the lower surface side of the support frame 26 and the screen frame 28 can be easily performed.

  (8) When the transport unit 76 is disposed in the horizontal position, one end of the driven support shaft 65 is positioned in the holding groove 77 and the lower end opening of the holding groove 77 is automatically closed by the armature 79 of the actuator 78. Is done. Therefore, the transport unit 76 can be easily set to the transport operation position.

  (9) As described above, the rotation drive motor 24 of the printing cylinder 22 is directly connected to the printing cylinder 22 and installed outside the printing machine frame 21, and the squeegee / doctor unit 56 is located on the upper side of the printing machine frame 21. A transport unit 76 is disposed outside the printing machine frame 21. Therefore, since a mechanism that directly acts on the printing operation is located on the outer side of the printing machine frame 21 and is not provided on the inner side, a wide space can be formed on the inner side of the printing machine frame 21. For this reason, an operator can enter the inside of the printing press frame 21 to perform a kind of maintenance work that could not be performed conventionally, and can easily keep the printing press in an optimum state. Also, it becomes possible to install the control mechanism of the printing press in the internal space using the internal space of the printing press frame 21. In this case, the control mechanism outside the printing press can be downsized or eliminated. Thus, the entire printing press can be made compact.

  (10) The printing mechanism such as the screen frame 28 is covered by the cover unit 87, and the air in the cover unit 87 is sucked by the intake unit 89 and discharged through the duct 94. Therefore, it is possible to suppress the air containing volatile substances from the ink existing on the screen frame 28 from drifting outside the printing press, thereby improving the working environment.

  (11) Since the operation panel 104 and the display device 105 are installed on the front surface of the support column 41 on the front side, an operator can perform various operations on the printing press at a suitable high position. You can do it while watching. Therefore, the printing press can be controlled easily and appropriately, and the work burden on the operator can be reduced.

(Example of change)
The present invention is not limited to the embodiment described above, and may be embodied in the following manner.

In the above-described embodiment, printing is performed on the sheet-like printing sheet α. However, printing is performed on a printing sheet that is wound in a roll and continuous in a strip shape.
A rotation driving motor 24 for the printing cylinder 22 is provided in the printing machine frame 21, and a power transmission mechanism is provided between the rotation driving motor 24 and the printing cylinder 22.

A frame movement drive motor 32 is provided in the printing machine frame 21 and a power transmission mechanism is provided between the frame movement drive motor 32 and the pinion 33.
The elevating drive cylinder 45 and elevating drive motors 48 and 49 of the squeegee / doctor unit 56 are provided in the printing press frame 21.

(Other technical ideas)
The technical idea grasped from the embodiment is as follows.
(A) A support frame for supporting the screen frame is provided on the upper part of the printing machine frame so as to be reciprocally movable, and a squeegee / doctor unit acting on the ink on the screen frame is located above the moving region of the support frame. In a screen printing machine provided so as to be movable up and down, and a printing cylinder for supporting a printing sheet is provided on the lower side of the moving area of the support frame,
A drive motor for rotating the printing cylinder is provided on the outer side of the printing machine frame, an output shaft of the driving motor is directly connected to a central axis of the printing cylinder, and the squeegee / doctor unit is connected to the printing machine frame. A screen printing machine provided on a support column erected on the upper end.

(B) The squeegee doctor unit is
An elevating member supported by the support pillar and moved up and down between a lower position and an upper retracted position by a driving means;
A squeegee that is provided on the elevating member and is moved up and down between the upper standby position by the driving means and the operating position on the lower screen;
2. The screen printing machine according to claim 1, further comprising a doctor that is provided on the elevating member and is moved up and down between an upper standby position and an operation position on the lower screen by a driving unit.

(C) In a printing machine in which a cover surrounding the printing mechanism from above is provided on the frame,
A printing machine having an air intake unit for sucking air in the cover out of the cover.
(D) The printing machine according to item (C), wherein the printing mechanism is a screen printing mechanism.

  (E) The cover is movable between an encircling position located above the printing mechanism and a retreating position retracted laterally from the encircling position, and the intake unit is mounted on the frame, The printing machine according to item (D), wherein the cover is opposed to an air intake hole on a side wall of the cover when the cover is in the surrounding position.

  DESCRIPTION OF SYMBOLS 21 ... Printing machine frame, 22 ... Printing cylinder, 24 ... Rotary drive motor, 26 ... Support frame, 27 ... Screen, 28 ... Screen frame, 31 ... Rack, 32 ... Frame movement drive motor, 33 ... Pinion, 41 ... Support pillar 45 ... Elevating drive cylinder, 48 ... Elevating drive motor, 49 ... Elevating drive motor, 50 ... Elevating member, 51 ... Elevating member, 54 ... Squeegee, 55 ... Doctor, 56 ... Squeegee / doctor unit, 67 ... Conveying drive motor, 73: undulating drive cylinder, 76: transport unit, 80: holding unit, 87: cover unit, 89: intake unit.

Claims (3)

In a screen printing machine in which a support frame on which a screen frame is supported is reciprocated along a conveyance direction of a print sheet with respect to a lower printing cylinder,
A screen printing machine in which racks are provided on both sides of the screen frame, pinions are provided on output shafts of drive motors provided on both sides of the frame, and the pinions are meshed with the racks.   A transport unit is provided downstream of the screen frame in the transport direction so as to be movable between an upper transport position and a hanging position depending on the transport position, and when the transport unit is positioned at the transport position, The screen printing machine according to claim 1, further comprising a holding unit that detects a state and holds the transport unit at a transport position.   The screen printing machine according to claim 2, wherein the transport unit is suspended at a right angle from the transport position.

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