A printing roller transmission mechanism for a flat screen printing machine

Abstract

The present application relates to a transmission mechanism for a printing roller of a flat screen printing machine, and relates to the technical field of screen printing machines, which includes a frame, a printing shaft rotatably mounted on the frame, a printing roller fixedly mounted on the printing shaft, a clamping claw arranged on the printing roller, and a screen frame slidably mounted on the frame, a first gear is fixedly mounted on the printing shaft, an escape groove is provided on the outer peripheral wall of the first gear, a driving mechanism for driving the first gear to rotate and driving the screen frame to reciprocate is installed on the frame, and a stop mechanism for controlling the rotation of the first gear is arranged on the frame. The present application drives the printing roller by driving the first gear to rotate by the driving mechanism, and controls the meshing state of the driving mechanism and the first gear by the cooperation of the stop mechanism and the escape groove, thereby solving the problem of inaccurate roller positioning and improving the working stability of the printing roller driving mechanism.

Description

Technical Field

[0001] The present application relates to the technical field of screen printing machines, and in particular to a printing roller transmission mechanism of a flat screen printing machine. Background Art

[0002] Screen printing machine is a machine for printing text and images. It is a type of printing machine. Screen printing machine is a more representative printing equipment among stencil printing machines. Screen printing machine is mainly composed of transmission mechanism, printing plate device, printing device, support device, i.e. printing platform, plate registration mechanism, drying device and electrical control device.

[0003] When the screen printing machine is working, the printing roller rotates together with the printing roller by clamping the printing paper through the clamping claws. The horizontal movement speed of the screen frame placed above the printing roller is the same as the linear speed of the printing roller, so as to achieve the relative fit between the screen and the printing paper. Under the action of the scraper, the ink on the screen passes through the printing holes opened above the screen to the top of the printing paper, so as to achieve printing on the printing paper. After rotating one circle, the printing roller needs to stop briefly to wait for the next printing paper to be delivered and the screen frame to return to the initial position.

[0004] With respect to the above-mentioned related technologies, the inventor believes that the screen printing machine in the related technologies has the problem of inaccurate positioning when the roller stops. Summary of the invention

[0005] In order to solve the problem of inaccurate roller positioning, the present application provides a printing roller transmission mechanism for a flat screen printing machine.

[0006] The printing roller transmission mechanism of a flat screen printing machine provided in this application adopts the following technical solution:

[0007] A printing roller transmission mechanism of a flat screen printing machine comprises a frame, a printing shaft rotatably mounted on the frame, a printing roller fixedly mounted on the printing shaft, a clamping claw arranged on the printing roller and a screen frame slidably mounted on the frame, a first gear is fixedly mounted on the printing shaft, an escape groove is provided on the outer peripheral wall of the first gear, a driving mechanism for driving the first gear to rotate and driving the screen frame to reciprocate is installed on the frame, and a stopping mechanism for controlling the rotation of the first gear is arranged on the frame.

[0008] By adopting the above technical solution, when the printing cylinder of the printing press is working, the printing paper is delivered to the printing cylinder and clamped by the clamp, and the driving mechanism drives the first gear to rotate, thereby realizing the rotation of the printing cylinder coaxially arranged with the first gear. The stop mechanism controls the position of the avoidance groove to control the stop and movement of the first gear. The avoidance groove of the first gear realizes the non-engagement state of the first gear and the stop mechanism, thereby realizing the stationary state of the first gear. The stop mechanism rotates the first gear so that the first gear meshes with the driving mechanism, thereby realizing secondary rotation. By opening the avoidance groove on the first gear, the stagnation of the cylinder is realized, so that the rotation position of the printing shaft (i.e., the cylinder) can be controlled more accurately, and it is stable and reliable during high-speed operation.

[0009] The printing roller is driven by utilizing the driving mechanism to drive the first gear to rotate, and the meshing state of the driving mechanism and the first gear is controlled by utilizing the cooperation of the stopping mechanism and the avoidance groove, thereby improving the problem of the relatively complex structure of the printing roller driving mechanism and improving the working stability of the printing roller driving mechanism.

[0010] Optionally, the driving mechanism includes a driving motor fixedly mounted on the frame, a crankshaft connected to the driving motor, a rocker eccentrically hinged on the crankshaft, an arcuate rack rotatably connected to the rocker away from the end of the crankshaft, a driving shaft rotatably mounted on the frame, and a second gear and a third gear fixedly mounted on the driving shaft, the second gear being meshed with the first gear, the third gear being meshed with the arcuate rack, and the arcuate rack being hingedly connected to the frame.

[0011] By adopting the above technical solution, when the driving mechanism is working, the driving motor drives the crankshaft to rotate, and the crankshaft drives the arc-shaped rack connected to it to swing through the rocker, and the arc-shaped rack drives the third gear to produce forward and reverse motion, and the third gear drives the second gear to produce forward and reverse motion through the driving shaft, and finally the rolling of the printing roller is realized through the meshing of the first gear and the second gear.

[0012] Optionally, the stopping mechanism includes a stopping rocker arm rotatably connected to the frame, a stopping groove provided on the stopping rocker arm, a stopping block fixedly mounted on the first gear, and a driving assembly driving the stopping rocker arm to rotate, and the stopping block is snap-fitted with the stopping groove.

[0013] By adopting the above technical solution, the stop rocker stops the first gear through the stop block to prevent the inertia of the first gear from rotating and causing it to continuously mesh with the second gear. At this time, the stop groove is close to the second gear to ensure the pause effect of installing the printing roller; the stop rocker continues to swing back, causing the second gear to mesh with the first gear and continue to rotate.

[0014] Optionally, the driving assembly includes a first cam and a second cam fixedly mounted on the crankshaft, a transmission rod clamped between the first cam and the second cam, and a first fixed block and a second fixed block mounted on both side walls of the transmission rod, the first cam abutting against the first fixed block, the second cam abutting against the second fixed block, the transmission rod being slidably connected to the crankshaft, and the end of the transmission rod being rotatably connected to the stop rocker arm.

[0015] By adopting the above technical solution, when the driving assembly is working, the first cam and the second cam rotate together under the action of the crankshaft, respectively pushing the first fixed block and the second fixed block provided on the transmission rod, so that the transmission rod slides along its length direction, and finally the power is delivered to the stop rocker to realize the back and forth swing of the stop rocker, and the driving assembly and the stop assembly cooperate with each other to realize the intermittent pause and unidirectional rotation of the printing roller.

[0016] Optionally, rollers are installed on outer walls of the first fixing block and the second fixing block.

[0017] By adopting the above technical solution, the roller can rotate along the first fixed block or the second fixed block. The rotation of the roller effectively reduces the friction between the first cam and the first fixed block, or the second cam and the second fixed block, effectively reduces the wear of the first cam or the second cam, and increases the service life of the first cam or the second cam.

[0018] Optionally, an adjustment groove is opened on the side wall of the transmission rod, the first fixed block is slidably installed in the adjustment groove, an adjustment screw is passed through the first fixed block, and the adjustment screw passes through the first fixed block and is fixedly connected to the transmission rod.

[0019] By adopting the above technical solution, the limit position of the transmission rod movement can be adjusted by adjusting the installation position of the first fixed block on the transmission rod, thereby adjusting the swing angle of the stop rocker arm, and ultimately improving the meshing accuracy between the first gear and the second gear.

[0020] Optionally, a buffer rod is fixedly mounted on the side wall of the transmission rod, a buffer spring is mounted on the buffer rod, and an end of the buffer spring away from the buffer rod is fixedly connected to the frame.

[0021] By adopting the above technical solution, the buffer spring buffers the sliding of the buffer rod, reduces the impact of the vibration impact of the equipment on the stop rocker, improves the working stability of the stop assembly, reduces the shaking of the first gear in the stopped state, that is, reduces the shaking of the printing roller, improves the clamping effect of the printed paper delivered to the clamp, and improves the matching accuracy of the first gear and the second gear.

[0022] Optionally, a driving gear is rotatably mounted on the end of the printing shaft, a driving rack is arranged on the side wall of the screen printing frame, the driving rack is meshed with the driving gear, and the driving gear is meshed with the second gear.

[0023] By adopting the above technical solution, when the screen printing frame is working, the second gear drives the driving gear to rotate forward and reverse, and the driving gear drives the driving rack to move back and forth, thereby realizing the reciprocating motion of the screen printing frame on the frame.

[0024] Optionally, the number of the driving gear, the driving rack and the second gear is set to be multiple and are respectively located at both ends of the printing roller, and a single driving gear, a single driving rack and a single second gear cooperate with each other to be used in a group.

[0025] By adopting the above technical solution, by setting the number of driving gears and driving racks to multiple, the driving gear pairs cooperate with the driving racks arranged on the silk screen screen frame one by one to jointly drive the silk screen screen frame, thereby improving the stability of the movement of the silk screen screen frame during operation and reducing the risk of poor printing quality caused by unstable movement of the silk screen screen frame.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] The printing cylinder is driven by the driving mechanism driving the first gear to rotate, and the engagement state of the driving mechanism and the first gear is controlled by the cooperation of the stop mechanism and the avoidance groove, thereby improving the problem of the relatively complex structure of the printing cylinder driving mechanism and improving the working stability of the printing cylinder driving mechanism;

[0028] By installing rollers on the outer walls of the first fixing block and the second fixing block, the rollers can rotate along the first fixing block or the second fixing block, and the rotation of the rollers effectively reduces the friction between the first cam and the first fixing block, or between the second cam and the second fixing block, effectively reduces the wear of the first cam or the second cam, and increases the service life of the first cam or the second cam;

[0029] By arranging a buffer spring between the buffer rod and the frame, the buffer spring buffers the sliding of the buffer rod, thereby reducing the impact of the vibration impact of the equipment on the stop rocker, improving the working stability of the stop assembly, reducing the shaking of the first gear in the stopped state, that is, reducing the shaking of the printing roller, improving the clamping effect of the printed paper delivered to the clamp, and improving the matching accuracy of the first gear and the second gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0031] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the structure A in the middle.

[0032] Figure 3 This is a schematic diagram of the structure of the adjustment tank according to an embodiment of the present application.

[0033] Explanation of the accompanying drawings: 1. frame; 2. printing shaft; 3. printing roller; 4. clamping claw; 5. screen frame; 6. first gear; 7. avoidance groove; 8. driving mechanism; 81. driving motor; 82. crankshaft; 83. rocker; 84. arc rack; 85. driving shaft; 86. second gear; 87. third gear; 9. stopping mechanism; 91. stopping rocker; 92. stopping groove; 93. stopping block; 94. driving assembly; 941. first cam; 942. second cam; 943. transmission rod; 944. first fixed block; 945. second fixed block; 10. roller; 11. adjusting groove; 12. adjusting screw; 13. buffer rod; 14. buffer spring; 15. driving gear; 16. driving rack. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] The embodiment of the present application discloses a printing roller transmission mechanism of a flat screen printing machine.

[0036] Reference Figure 1 and Figure 2 A printing roller transmission mechanism of a flat screen printing machine includes a frame 1, a printing shaft 2 rotatably mounted on the frame 1, a printing roller 3 fixedly mounted on the printing shaft 2, a screen frame 5 slidably mounted above the frame 1, a driving mechanism 8 for driving the printing roller 3 to rotate, and a stopping mechanism 9 for controlling the intermittent stop of the printing roller 3.

[0037] The driving mechanism 8 includes a driving motor 81 installed on the frame 1 by bolts, a crankshaft 82 connected to the driving motor 81 by a coupling, a rocker 83 eccentrically hinged on the crankshaft 82, an arcuate rack 84 hingedly connected to the end of the rocker 83 away from the crankshaft 82, a driving shaft 85 rotatably installed on the frame 1 by a bearing, and a second gear 86 and a third gear 87 installed on the driving shaft 85 by a flat key. The arcuate rack 84 is rotatably installed on the frame 1 and meshes with the third gear 87. Under the driving action of the rocker 83, it swings back and forth along the hinge between itself and the frame 1.

[0038] When the driving mechanism 8 is working, the driving motor 81 drives the crankshaft 82 to rotate, and the crankshaft 82 drives the arc-shaped rack 84 hinged thereto to swing through the rocker 83, and the arc-shaped rack 84 drives the third gear 87 to produce forward and reverse motions, and the third gear 87 drives the second gear 86 to rotate through the driving shaft 85, and finally transmits power to the printing roller 3 through the second gear 86 to realize the rotation of the printing roller 3.

[0039] The end of the printing cylinder 3 is fixedly connected with the first gear 6 through a flat key, and the first gear 6 is meshed with the second gear. An escape groove 7 is provided on the outer peripheral wall of the first gear 6. The escape groove 7 can be used to temporarily disengage the first gear 6 from the driving mechanism 8 to achieve an intermittent pause effect of the printing cylinder 3. The driving mechanism 8 drives the rotation of the printing cylinder 3 through the first gear 6, and the stop mechanism 9 controls the intermittent stop of the first gear 6 by controlling the position of the escape groove 7, thereby finally achieving control of the printing cylinder 3.

[0040] Reference Figure 2 and Figure 3 The stopping mechanism 9 includes a stopping rocker 91 hingedly connected to the frame 1, a stopping block 93 installed on the first gear 6 by bolts, a stopping groove 92 opened at the end of the stopping rocker 91 and a driving component 94 for driving the stopping rocker 91 to swing, and a roller 10 is rotatably installed on the outer wall of the stop block 93, and the roller 10 on the outer wall of the stop block 93 is clamped and installed in the stopping groove 92.

[0041] The driving assembly 94 includes a first cam 941 and a second cam 942 fixedly mounted on the crankshaft 82, and a transmission rod 943 slidably mounted on the crankshaft 82. An adjustment groove 11 is provided on the side wall of the transmission rod 943. A first fixing block 944 is fixedly mounted on the bottom of the adjustment groove 11 through an adjustment bolt. A second fixing block 945 is fixedly mounted on the side wall of the transmission rod 943 opposite to the adjustment groove 11. The transmission rod 943 is clamped and fixed between the first cam 941 and the second cam 942. Rollers 10 are rotatably mounted on the outer walls of the first fixing block 944 and the second fixing block 945. The first cam 941 abuts against the roller 10 on the first fixing block 944, and the second cam 942 abuts against the roller 10 on the second fixing block 945. The transmission rod 943 is hingedly mounted with the stop rod. The side wall of the transmission rod 943 is connected with a buffer rod 13 through bolts, and a buffer spring 14 is connected to the buffer rod 13 through bolts. The end of the buffer spring 14 away from the buffer rod 13 is bolted to the frame 1.

[0042] When the stop mechanism 9 is working, the crankshaft 82 drives the first cam 941 and the second cam 942 to rotate, the first cam 941 abuts against the roller 10 of the first fixed block 944, and the second cam 942 abuts against the roller 10 of the second fixed block 945, so as to realize the reciprocating motion of the transmission rod 943 along its length direction, thereby realizing the swing of the stop rocker 91. When the first cam 941 acts on the first fixed block 944, the stop rocker 91 limits the stop block 93, limits the rotation of the first gear 6, and stops the printing cylinder 3. When the second cam 942 acts on the second fixed block 945, the stop rocker 91 drives the first gear 6 to mesh with the second gear 86 through the stop block 93, so as to realize the synchronous rotation of the second gear 86 and the first gear 6.

[0043] The adjusting slot 11 can adjust the swing angle of the stop rocker 91, that is, improve the meshing accuracy of the first gear 6 and the second gear 86, and improve the working stability of the driving assembly 94. The buffer spring 14 absorbs the vibration of the machine, reduces the influence of the vibration on the working state of the stop rod, and improves the working stability of the stop assembly.

[0044] The two ends of the printing cylinder 3 are fixedly connected with a plurality of driving gears 15 by keys. Preferably, the number of driving gears 15 is set to 2, and they are respectively located at the two ends of the printing cylinder 3, and the driving gears 15 are meshed with the third gear 87. The shape of the screen printing frame 5 is rectangular, and the two sides of the screen printing frame 5 close to the frame 1 are welded and connected with racks, and the racks are meshed with the driving gears 15. When the screen printing frame 5 is working, the third gear 87 drives the driving gear 15 to produce forward and reverse reciprocating motion, and the cooperation of the driving gear 15 and the rack converts the rotation into reciprocating movement, so as to realize the reciprocating motion of the screen printing frame 5 on the frame 1.

[0045] The implementation principle of the printing roller transmission mechanism of a flat screen printing machine in the embodiment of the present application is as follows: when the printing machine is working, the driving mechanism 8 drives the driving gear 15 to generate forward and reverse motion, and the driving gear 15 uses its cooperation with the rack to convert the forward and reverse motion into the reciprocating movement of the screen printing frame 5. Under the action of the stop mechanism 9, when the third gear 87 of the driving mechanism 8 rotates forward, the stop mechanism 9 makes the second gear 86 mesh with the first gear 6, and the driving gear 15 and the first gear 6 rotate under the action of the third gear 87, the printing roller 3 rotates, and the screen printing frame 5 moves, and the moving speed is the same as the linear speed of the printing roller 3. When the third gear 87 is reversed, the stop mechanism 9 makes the avoidance groove 7 close to the third gear 87, and the first gear 6 stops rotating, realizing the intermittent pause of the roller. At the same time, the screen printing frame 5 returns to the initial position under the action of the driving mechanism 8, waiting for the next reciprocating motion.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A printing roller transmission mechanism of a flat screen printing machine, comprising a frame (1), a printing shaft (2) rotatably mounted on the frame (1), a printing roller (3) fixedly mounted on the printing shaft (2), a clamping claw (4) arranged on the printing roller (3), and a screen frame (5) slidably mounted on the frame (1), characterized in that: A first gear (6) is fixedly mounted on the printing shaft (2); an escape groove (7) is provided on the outer peripheral wall of the first gear (6); a driving mechanism (8) for driving the first gear (6) to rotate and for driving the screen printing frame (5) to reciprocate is mounted on the frame (1); and a stop mechanism (9) for controlling the rotation of the first gear (6) is provided on the frame (1); The driving mechanism (8) comprises a driving motor (81) fixedly mounted on the frame (1), a crankshaft (82) connected to the driving motor (81), a rocker (83) eccentrically hinged on the crankshaft (82), an arc-shaped rack (84) rotatably connected to the end of the rocker (83) away from the crankshaft (82), a driving shaft (85) rotatably mounted on the frame (1), and a second gear (86) and a third gear (87) fixedly mounted on the driving shaft (85), the second gear (86) being meshed with the first gear (6), the third gear (87) being meshed with the arc-shaped rack (84), and the arc-shaped rack (84) being hingedly connected to the frame (1); the stopping mechanism (9) comprises a stopping rocker (91) rotatably connected to the frame (1), a stopping groove (92) provided on the stopping rocker (91), a fixing a stop block (93) mounted on the first gear (6), and a driving assembly (94) for driving the stop rocker (91) to rotate, the stop block (93) being engaged with the stop groove (92); the driving assembly (94) comprising a first cam (941) and a second cam (942) fixedly mounted on the crankshaft (82), a transmission rod (943) clamped between the first cam (941) and the second cam (942), a first fixing block (944) and a second fixing block (945) mounted on two side walls of the transmission rod (943), the first cam (941) being in contact with the first fixing block (944), the second cam (942) being in contact with the second fixing block (945), the transmission rod (943) being slidably connected to the crankshaft (82), and an end of the transmission rod (943) being rotationally connected to the stop rocker (91); An adjustment groove (11) is provided on the side wall of the transmission rod (943), the first fixing block (944) is slidably mounted in the adjustment groove (11), an adjustment screw (12) is passed through the first fixing block (944), and the adjustment screw (12) passes through the first fixing block (944) and is fixedly connected to the transmission rod (943); A buffer rod (13) is fixedly mounted on the side wall of the transmission rod (943), a buffer spring (14) is mounted on the buffer rod (13), and an end of the buffer spring (14) away from the buffer rod (13) is fixedly connected to the frame (1).

2. The printing cylinder transmission mechanism of a flat screen printing machine according to claim 1, characterized in that: Rollers (10) are mounted on the outer walls of the first fixing block (944) and the second fixing block (945).

3. The printing cylinder transmission mechanism of a flat screen printing machine according to claim 1, characterized in that: A driving gear (15) is rotatably mounted on the end of the printing shaft (2), a driving rack (16) is arranged on the side wall of the screen printing frame (5), the driving rack (16) is meshed with the driving gear (15), and the driving gear (15) is meshed with the second gear (86).

4. The printing cylinder transmission mechanism of a flat screen printing machine according to claim 3, characterized in that: The number of the driving gear (15), the driving rack (16) and the second gear (86) is set to be multiple and are respectively located at the two ends of the printing roller (3); a single driving gear (15), a single driving rack (16) and a single second gear (86) cooperate with each other to form a group for use.

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