A UV printing device for the side surface of a cylinder

Abstract

The present invention discloses a side surface UV printing device for a cylinder, comprising: a base, an inner cavity of the base is provided with a conveying mechanism, a column is fixedly installed on the rear side of the base, a printing component is provided on the front top of the column, a driving feeding mechanism is provided on the right side of the column, a controller is installed on the front side of the base, and the conveying mechanism, the printing component and the driving feeding mechanism are all electrically connected to the controller. The side surface UV printing device for a cylinder can enable a feeding motor to be quickly connected to a moving component through a connecting component, can feed subsequent moving components during the printing process, avoid frequent clamping and feeding, reduce the waiting time of the processing process, is suitable for continuous large-scale printing, and can drive the substrate to rotate a specified arc by controlling the rotation angle of the output end of the feeding motor to be suitable for substrates of different diameters.

Description

Technical Field

[0001] The invention relates to the technical field of printers, in particular to a UV printing device for the side surface of a cylinder. Background Art

[0002] UV printing is a printing process that uses ultraviolet rays to dry and cure ink. It requires the ink containing photosensitizer to be matched with UV curing lamps. The application of UV printing is one of the most important contents in the printing industry. UV ink has covered offset printing, screen printing, inkjet printing, pad printing and other fields. The traditional printing industry generally refers to UV as a printing effect process, which is to wrap a layer of varnish (with gloss, matte, inlaid crystals, glitter powder, etc.) on a piece of paper with the pattern you want. It is mainly to increase the brightness and artistic effect of the product and protect the surface of the product. It has high hardness, corrosion resistance, friction resistance, and is not easy to scratch. Some laminated products are now changed to UV, which can meet environmental protection requirements;

[0003] In the prior art, when printing the side surface of cylindrical substrates such as thermos cups and cans, a special fixture is usually installed under the printing probe of the UV printer. The special fixture fixes the substrate, and the rotating shaft controls the rotation of the substrate. The combined lateral and rotational movement of the substrate during printing realizes 360-degree uninterrupted printing on the outer surface of the cylindrical substrate, thereby achieving the purpose of one-time molding of the outer surface of the cylindrical substrate;

[0004] The common printing equipment on the market that can print on the side surface of a cylinder requires certain loading equipment or manual loading, and unloading after printing. The printing waiting interval is long, and continuous printing cannot be performed. Only small batches can be customized, and large-scale printing is difficult to achieve. In addition, the diameters of the substrates are different, resulting in inconsistent spacing between the inkjet head and the outer circumference of the cylinder, some large and some small. In addition, when the diameters of the substrates are different, the feed amount corresponding to the same rotation angle is also different, which affects the printing quality. It is difficult to apply to substrates of different diameters and cannot meet the needs of large-scale printing. Summary of the invention

[0005] The object of the present invention is to provide a cylindrical side surface UV printing device to at least solve the problem that the prior art cannot print continuously in large quantities and cannot be applied to substrates with different diameters.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A UV printing device for the side surface of a cylinder, characterized in that it comprises: a base, an inner cavity of the base is provided with a conveying mechanism, a column is fixedly installed on the rear side of the base, a printing component is provided on the top of the front side of the column, a driving feeding mechanism is provided on the right side of the column, a controller is installed on the front side of the base, and the conveying mechanism, printing component and driving feeding mechanism are all electrically connected to the controller.

[0007] Preferably, the printing assembly includes: a first slide installed at the top front end of the column, a lifting seat is fixedly installed on the movable end of the first slide, a second slide is arranged on the right side of the lifting seat, a moving block is fixedly installed on the movable end of the second slide, an inkjet is installed on the right side of the bottom of the moving block, and a glow discharge lamp is installed on the left side of the bottom of the moving block, and the first slide, the second slide, the inkjet and the glow discharge lamp are all electrically connected to the controller.

[0008] Preferably, the conveying mechanism includes: a conveying motor fixedly mounted on the right end of the rear side of the base, and the conveying motor is electrically connected to the controller, transmission shafts are rotatably mounted on both left and right ends of the rear side of the inner cavity of the base, the transmission shaft on the right side is fixedly connected to the output end of the conveying motor, sprockets are fixedly mounted on the outer walls of the two transmission shafts, chains are sleeved on the tooth side walls of the two sprockets, annular grooves are fixedly mounted on the front and rear sides of the inner cavity of the base, grooves are provided on the left and right ends of the two annular grooves, a number of moving components are slidably mounted on the inner cavities of the two annular grooves, a number of the moving components are fixedly connected to the chain, a positioning component is fixedly mounted on the middle position of the top front side of the base, and the positioning component is electrically connected to the controller.

[0009] Preferably, the moving assembly includes: a fixed rod fixedly mounted on the outside of the chain, a moving seat is provided on the top of the fixed rod, a first pulley is rotatably mounted on the left ends of both front and rear sides of the moving seat, the two first pulleys are respectively slidably mounted on the inner cavities of two annular grooves, and the fixed rod corresponds to the position of the two first pulleys, a second pulley is rotatably mounted on the right ends of both front and rear sides of the moving seat, the two second pulleys are respectively slidably mounted on the inner cavities of two annular grooves, two driving rollers are respectively rotatably mounted on the left and right ends of the rear side of the inner cavity of the moving seat, two synchronous wheels are respectively rotatably mounted on the left and right ends of the front side of the moving seat, and the two synchronous wheels are respectively fixedly connected to the two driving rollers, and the outer walls of the two synchronous wheels are sleeved with synchronous belts.

[0010] Preferably, the positioning assembly comprises: a proximity switch installed on the top front side of the base, the proximity switch is electrically connected to the controller, and a limit block is fixedly installed on the top front side of the movable seat.

[0011] Preferably, the driving feed mechanism includes: a feed motor fixedly mounted on the right side of the column, the feed motor being electrically connected to the controller, a drive wheel fixedly mounted on the output end of the feed motor, a synchronization groove being provided on the front side of the drive wheel, and a connecting component being provided on the rear side of each of the moving components.

[0012] Preferably, the connecting assembly includes: an installation cavity provided at the right end of the rear side of the movable seat, card slots are provided on the upper and lower sides of the installation cavity, a rotating wheel is rotatably installed in the inner cavity of the installation cavity, the rotating wheel is fixedly connected to a driving roller located on the right side, a synchronization block is fixedly installed on the rear side of the rotating wheel, a first slide groove is provided on the top of the rotating wheel, a second slide groove is provided on the top of the synchronization block, a connecting cavity is provided between the first slide groove and the second slide groove, an extrusion block is slidably installed in the inner cavity of the second slide groove, a card block is slidably installed in the inner cavity of the first slide groove, a connecting block is provided between the extrusion block and the card block, and the connecting block is slidably installed on the side wall of the connecting cavity, and a spring is provided between the connecting block and the bottom of the inner cavity of the connecting cavity.

[0013] The UV printing device for the side surface of a cylinder proposed by the present invention has the following beneficial effects compared with the prior art:

[0014] 1. The output end of the controller drives the conveying motor to rotate, and the transmission shaft and sprocket connected thereto are driven to rotate, thereby driving the moving assembly to move to the left through the chain. When the proximity switch detects the limit block, the synchronous groove squeezes the extrusion block, and the extrusion block drives the connecting block to slide downward, and the card block releases the limit on the card slot. At this time, the feed motor can drive the rotating wheel to rotate through the driving wheel. After printing is completed, the controller controls the feed motor to rotate the synchronous groove and the synchronous block and fix them in the horizontal direction to facilitate the next connection with the driving wheel. Therefore, the feed motor can be quickly connected to the moving assembly through the connecting assembly, and the subsequent moving assembly can be loaded during the printing process, avoiding frequent clamping and loading, reducing the waiting time of the processing process, and is suitable for continuous large-scale printing.

[0015] 2. The present invention controls the output end of the feed motor through a controller to drive the driving wheel to rotate, and the driving wheel drives the driving roller connected thereto to rotate through a connecting assembly. Under the driving action of a synchronous belt and two synchronous wheels, the two driving rollers rotate synchronously in the same direction, which can drive the printing material to rotate. Therefore, by controlling the rotation angle of the output end of the feed motor, the printing material can be driven to rotate a specified arc to adapt to printing materials of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2It is a front cross-sectional view of the present invention;

[0018] Figure 3 It is a left side view of the present invention;

[0019] Figure 4 It is a right side cross-sectional view of the present invention;

[0020] Figure 5 This is the enlarged view of point A;

[0021] Figure 6 A top view of the present invention;

[0022] Figure 7 It is a schematic diagram of the structure of the mobile component;

[0023] Figure 8 This is the rear view of the mobile component;

[0024] Fig. 9 It is the right side cross-sectional view of the mobile component.

[0025] In the figure: 2, base, 3, column, 4, printing component, 41, first slide, 42, lifting seat, 43, second slide, 44, moving block, 45, inkjet, 46, glow discharge lamp, 5, conveying mechanism, 51, conveying motor, 52, transmission shaft, 53, sprocket, 54, chain, 55, annular slide, 56, groove, 57, moving component, 571, moving seat, 572, fixing rod, 573, first pulley, 574, second pulley, 575, driving roller, 576, synchronous wheel, 577, synchronous belt, 58, positioning component, 581, proximity switch, 582, limit block, 6, driving feeding mechanism, 61, feeding motor, 62, driving wheel, 63. Synchronous groove, 64. Connecting assembly, 641. Mounting cavity, 642. Card slot, 643. Rotating wheel, 644. Synchronous block, 645. First slide groove, 646. Second slide groove, 647. Connecting cavity, 648. Extrusion block, 649. Connecting block, 6410. Card block, 6411. Spring, 7. Controller. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-9In an embodiment of the present invention, a cylindrical side surface UV printing device includes: a base 2, a column 3, a printing component 4, a conveying mechanism 5, a driving feeding mechanism 6 and a controller 7. The inner cavity of the base 2 is provided with the conveying mechanism 5, the rear side of the base 2 is fixedly installed with the column 3, the front top of the column 3 is provided with the printing component 4, the right side of the column 3 is provided with the driving feeding mechanism 6, the front side of the base 2 is installed with the controller 7, and the conveying mechanism 5, the printing component 4 and the driving feeding mechanism 6 are all electrically connected to the controller 7.

[0028] As a preferred solution, Figure 1-2 As shown, further, the printing assembly 4 includes: a first slide 41, a lifting seat 42, a second slide 43, a moving block 44, an inkjet 45 and a glow discharge lamp 46. The first slide 41 is installed on the top of the front side of the column 3, the lifting seat 42 is fixedly installed on the moving end of the first slide 41, the lifting seat 42 is arranged on the right side of the lifting seat 42, the moving block 44 is fixedly installed on the moving end of the second slide 43, the inkjet 45 is installed on the right side of the bottom of the moving block 44, and the glow discharge lamp 46 is installed on the left side of the bottom of the moving block 44. The glow discharge lamp 46 is a thin coating containing mercury components evenly coated on the inner wall of the vacuum fluorescent tube. The electrodes at both ends provide a voltage difference (voltage drop) to generate ion discharge, thereby generating ultraviolet radiation. The ultraviolet light emitted by the glow discharge lamp is generally of a lower temperature, commonly known as cold light ultraviolet light. The first slide 41, the second slide 42, the inkjet 45 and the glow discharge lamp 46 are all electrically connected to the controller 7. The controller 7 is modularly composed of an internal CPU, instruction and data storage, input and output units, power supply modules, digital simulation and other units. Instructions for performing operations such as logical operations, sequential control, timing, counting and arithmetic operations are stored internally, and various types of mechanical equipment or production processes are controlled through digital or analog input and output.

[0029] As a preferred solution, Figure 1-4As shown, further, the conveying mechanism 5 includes: a conveying motor 51, a transmission shaft 52, a sprocket 53, a chain 54, an annular slide 55, a groove 56, a moving component 57 and a positioning component 58, the conveying motor 51 is fixedly mounted on the right end of the rear side of the base 2, and the conveying motor 51 It is electrically connected to the controller 7. A transmission shaft 52 is rotatably installed on both left and right ends of the rear side of the inner cavity of the base 2. The transmission shaft 52 on the right side is fixedly connected to the output end of the conveying motor 51. Sprockets 53 are fixedly installed on the outer walls of the two transmission shafts 52. Chains 54 are sleeved on the tooth side walls of the two sprockets 53. The sprockets 53 and the chains 54 constitute a chain drive. The chain drive is a transmission mode in which the movement and power of the sprocket 53 with a special tooth shape are transmitted to the sprocket 53 with a special tooth shape through the chain 54. Annular grooves 55 are fixedly installed on both the front and rear sides of the inner cavity of the base 2. Grooves 56 are provided on the left and right ends of the two annular grooves 55. Several moving components 57 are slidably installed in the inner cavity of the two annular grooves 55. Several moving components 57 are fixedly connected to the chain 54. A positioning component 58 is fixedly installed in the middle position of the top front side of the base 2, and the positioning component 58 is electrically connected to the controller 7.

[0030] As a preferred solution, Figure 7-9 As shown, further, the moving assembly 571 includes: a moving seat 571, a fixed rod 572, a first pulley 573, a second pulley 574, a driving roller 575, a synchronous wheel 576 and a synchronous belt 577, the fixed rod 572 is fixedly installed on the outside of the chain 54, the moving seat 571 is arranged on the top of the fixed rod 572, the first pulley 573 is rotatably installed on the left ends of the front and rear sides of the moving seat 571, the two first pulleys 573 are respectively slidably installed in the inner cavity of the two annular grooves 55, and the fixed rod 572 corresponds to the position of the two first pulleys 573, the second pulleys 574 are rotatably installed on the right ends of the front and rear sides of the moving seat 571, and the two second pulleys 574 are respectively slidably installed in the two annular grooves 55 The inner cavity of the movable seat 571 has two driving rollers 575 rotatably mounted on the left and right ends of the rear side of the inner cavity, and two synchronous wheels 576 rotatably mounted on the left and right ends of the front side of the movable seat 571, and the two synchronous wheels 576 are fixedly connected to the two driving rollers 575 respectively, and the outer walls of the two synchronous wheels 576 are sleeved with synchronous belts 577, and the synchronous wheels 576 and the synchronous belt 577 constitute a synchronous belt drive, and the inner circumferential surface of the synchronous belt 577 is provided with an endless belt with equally spaced teeth, and the synchronous wheel 576 is a wheel with a corresponding fit to the conveyor belt, and the synchronous belt drive combines the advantages of belt drive, chain drive and gear drive, and transmits power through the meshing of the teeth of the synchronous belt 577 and the tooth grooves of the synchronous wheel 576 during rotation.

[0031] As a preferred solution, Figure 4Or as shown in 6, further, the positioning component 58 includes: a proximity switch 581 and a limit block 582, the proximity switch 581 is installed on the top front side of the base 2, the proximity switch 581 is electrically connected to the controller 7, the proximity switch 581 is a position switch that can be operated without direct mechanical contact with the moving parts, when the object approaches the sensing surface of the switch to the action distance, the switch can be activated without mechanical contact or applying any pressure, thereby driving the DC appliance or providing control instructions to the controller 7, and the limit block 582 is fixedly installed on the top front side of the moving seat 571.

[0032] As a preferred solution, Figure 4-5 As shown, further, the driving feed mechanism 6 includes: a feed motor 61, a driving wheel 62, a synchronization groove 63 and a connecting component 64. The feed motor 61 is fixedly installed on the right side of the column 3, and the feed motor 61 is electrically connected to the controller 7. The output end of the feed motor 61 is fixedly installed with a driving wheel 62, and a synchronization groove 63 is provided on the front side of the driving wheel 62. A connecting component 64 is provided on the rear side of each moving component 57. When the moving component 57 reaches the front of the driving wheel 62, the driving wheel 62 is connected to the driving roller 575 through the connecting component 64.

[0033] As a preferred solution, Figure 8-9As shown, further, the connecting assembly 64 includes: a mounting cavity 641, a card slot 642, a rotating wheel 643, a synchronization block 644, a first slide groove 645, a second slide groove 646, a connecting cavity 647, an extrusion block 648, a connecting block 649, a card block 6410 and a spring 6411. The mounting cavity 641 is provided at the right end of the rear side of the moving seat 572, and the card slots 642 are provided on both the upper and lower sides of the mounting cavity 641. A rotating wheel 643 is rotatably installed in the inner cavity, and the rotating wheel 643 is fixedly connected to the driving roller 575 located on the right side. A synchronization block 644 is fixedly installed on the rear side of the rotating wheel 643. A first slide groove 645 is provided on the top of the rotating wheel 643, and a second slide groove 646 is provided on the top of the synchronization block 644. A connecting cavity 647 is provided between the first slide groove 645 and the second slide groove 646. An extrusion block 648 is slidably installed in the inner cavity of the second slide groove 646. A clamping block 6410 is slidably installed in the inner cavity of the first slide groove 645. A connecting block 649 is provided between the extrusion block 648 and the clamping block 6410, and the connecting block 649 is slidably installed on the side wall of the connecting cavity 647. The connecting block 648 A spring 6411 is arranged between the bottom of the inner cavity of the connecting cavity 647. The spring 6411 is a rotation spring. It produces elastic deformation after being squeezed and returns to its initial state after the external force is removed. Under the elastic force of the spring 6411, the connecting block 648 is in close contact with the top of the connecting cavity 647, so that the card block 6410 is engaged with the card slot 642. At this time, the synchronization block 644 is horizontal. When the squeezing block 648 is squeezed and slides downward, the connecting block 648 overcomes the elastic force of the spring 6411 and slides downward, so that the card block 6410 releases the limit on the card slot 642.

[0034] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process. The specific work is as follows.

[0035] Step 1: Place the substrate on the top of the two driving rollers 575 of the moving assembly 57. The controller 7 drives the output end of the conveying motor 51 to drive the transmission shaft 52 and the sprocket 53 connected thereto to rotate, thereby driving the moving assembly 57 to move to the left through the chain 54. When the proximity switch 581 detects the limit block 582, the moving assembly 57 is in place, and the controller 7 controls the conveying motor 51 to brake.

[0036] Step 2: When the proximity switch 581 detects the limit block 582, the synchronization block 644 is just plugged into the synchronization groove 63, and the inner wall of the synchronization groove 63 squeezes the extrusion block 648. The extrusion block 648 drives the connection block 648 to slide downward to overcome the elastic force of the spring 6411, so that the card block 6410 releases the limit on the card groove 642. At this time, the feed motor 61 can drive the rotating wheel 643 to rotate through the driving wheel 62. Under the driving action of the synchronous belt 577 and the two synchronous wheels 576, the two driving rollers 575 rotate synchronously in the same direction, which can drive the substrate to rotate. The controller 7 can drive the position of the inkjet 45 and the glow discharge lamp 46 by controlling the first slide 41 and the second slide 43 to print the substrate;

[0037] Step 3, after printing is completed, the controller 7 controls the feed motor 61 to rotate the synchronous slot 63 and the synchronous block 644 and keep them in the horizontal direction, the controller 7 controls the conveying motor 51 to rotate, conveys the moving assembly 57 to the left, the synchronous block 644 slides and separates along the synchronous slot 63, the synchronous slot 63 releases the limit of the extrusion block 648, and pushes the connecting block 648 to slide upward under the elastic force of the spring 6411, and makes the connecting block 648 closely contact with the top of the connecting cavity 647, so that the clamping block 6410 is clamped with the clamping slot 642, thereby fixing the synchronous block 644 in the horizontal direction, so as to facilitate the next connection with the driving wheel 62;

[0038] The present invention can drive the printing material to rotate a specified arc, can be suitable for printing materials of different diameters, and can quickly connect the feed motor with the moving component through the connecting component, thereby avoiding frequent clamping, reducing the intermittent time of the processing process, and is suitable for continuous large-scale printing.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. In the description of the present invention, it should be understood that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A UV printing device for the side surface of a cylinder, characterized in that: include: A base (2), wherein a conveying mechanism (5) is arranged in an inner cavity of the base (2), a column (3) is fixedly mounted on the rear side of the base (2), a printing assembly (4) is arranged on the top of the front side of the column (3), a driving feeding mechanism (6) is arranged on the right side of the column (3), a controller (7) is installed on the front side of the base (2), and the conveying mechanism (5), the printing assembly (4) and the driving feeding mechanism (6) are all electrically connected to the controller (7); The printing assembly (4) comprises: a first slide (41) mounted on the front top of the column (3); a lifting seat (42) is fixedly mounted on the movable end of the first slide (41); a second slide (43) is arranged on the right side of the lifting seat (42); a moving block (44) is fixedly mounted on the movable end of the second slide (43); an inkjet (45) is mounted on the right side of the bottom of the moving block (44); a glow discharge lamp (46) is mounted on the left side of the bottom of the moving block (44); the first slide (41), the second slide (43), the inkjet (45) and the glow discharge lamp (46) are all electrically connected to a controller (7); The conveying mechanism (5) comprises: a conveying motor (51) fixedly mounted on the right end of the rear side of the base (2), and the conveying motor (51) is electrically connected to a controller (7); transmission shafts (52) are rotatably mounted on both left and right ends of the rear side of the inner cavity of the base (2); the transmission shaft (52) located on the right side is fixedly connected to the output end of the conveying motor (51); sprocket wheels (53) are fixedly mounted on the outer walls of the two transmission shafts (52); and chains (53) are sleeved on the tooth side walls of the two sprocket wheels (53). 54), an annular slide groove (55) is fixedly installed on both the front and rear sides of the inner cavity of the base (2), and grooves (56) are opened at the left and right ends of the two annular slide grooves (55), and a plurality of moving components (57) are slidably installed in the inner cavity of the two annular slide grooves (55), and the plurality of moving components (57) are fixedly connected to the chain (54), and a positioning component (58) is fixedly installed at the middle position of the top front side of the base (2), and the positioning component (58) is electrically connected to the controller (7); The moving assembly (57) comprises: a fixed rod (572) fixedly mounted on the outside of the chain (54); a moving seat (571) is arranged on the top of the fixed rod (572); first pulleys (573) are rotatably mounted on the left ends of both the front and rear sides of the moving seat (571); the two first pulleys (573) are slidably mounted in the inner cavities of the two annular sliding grooves (55), respectively; the positions of the fixed rod (572) and the two first pulleys (573) correspond to each other; the right ends of both the front and rear sides of the moving seat (571) are rotatably mounted A second pulley (574) is installed on the movable seat (571), and the two second pulleys (574) are slidably installed in the inner cavities of the two annular slide grooves (55), respectively; two driving rollers (575) are rotatably installed at the left and right ends of the rear side of the inner cavity of the movable seat (571), and two synchronous wheels (576) are rotatably installed at the left and right ends of the front side of the movable seat (571), respectively, and the two synchronous wheels (576) are fixedly connected to the two driving rollers (575), and the outer walls of the two synchronous wheels (576) are sleeved with synchronous belts (577); The positioning assembly (58) comprises: a proximity switch (581) installed on the top front side of the base (2), the proximity switch (581) being electrically connected to the controller (7), and a limit block (582) being fixedly installed on the top front side of the movable seat (571); The driving feed mechanism (6) comprises: a feed motor (61) fixedly mounted on the right side of the column (3), the feed motor (61) being electrically connected to the controller (7), a drive wheel (62) being fixedly mounted on the output end of the feed motor (61), a synchronization groove (63) being provided on the front side of the drive wheel (62), and a connection component (64) being provided on the rear side of each of the moving components (57); The connecting assembly (64) comprises: a mounting cavity (641) provided at the right end of the rear side of the movable seat (571); a clamping groove (642) provided on both the upper and lower sides of the mounting cavity (641); a rotating wheel (643) rotatably installed in the inner cavity of the mounting cavity (641); the rotating wheel (643) is fixedly connected to the driving roller (575) located on the right side; a synchronization block (644) is fixedly installed on the rear side of the rotating wheel (643); a first sliding groove (645) is provided on the top of the rotating wheel (643); and a second sliding groove (645) is provided on the top of the synchronization block (644). 46), a connecting cavity (647) is provided between the first slide groove (645) and the second slide groove (646), an extrusion block (648) is slidably installed in the inner cavity of the second slide groove (646), a clamping block (6410) is slidably installed in the inner cavity of the first slide groove (645), a connecting block (649) is provided between the extrusion block (648) and the clamping block (6410), and the connecting block (649) is slidably installed on the side wall of the connecting cavity (647), and a spring (6411) is provided between the connecting block (649) and the bottom of the inner cavity of the connecting cavity (647).

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