A surface printing device for woven bags

Abstract

The present invention relates to the technical field of woven bag printing, and specifically relates to a surface printing device for woven bags, which includes a printing device. Push foot devices are fixed at the four corner positions of the printing device. The push foot device includes a first plate, a control body, a first column, a return spring, a chassis, a unit wheel and a braking member. One side of the first plate is connected with the control body, and the first column vertically penetrates through one end of the control body. The return spring is sleeved on the first column, and the bottom end of the first column is connected with the chassis. When the printing device drives the push foot device to fall for printing, the four push foot devices respectively generate an external thrust on the four corners of the woven bag, ensuring that the woven bag will not have any reverse wrinkles and the woven bag is fully spread out, thereby improving the printing quality of the woven bag. After the printing is completed, when the push foot device rises and has not completely separated from the woven bag, all the unit wheels on the chassis move in a circular motion, and then the push foot device separates from the woven bag, so that the situation of the woven bag sticking to the push foot device will not occur.

Description

Technical Field

[0001] The present invention relates to the technical field of woven bag printing, and specifically provides a surface printing device for woven bags. Background Art

[0002] During the production and printing process of woven bags, it is necessary to press the woven bags to facilitate printing. If the pressing device cannot fully spread out the woven bags, it is easy to cause wrinkles and incomplete printing on the woven bags. Referring to the surface printing device for woven bag processing with the publication number CN218343055U in the existing patent documents, the printing device is driven by a cylinder to lift and lower. When the printing device descends, the pressing device pushes and spreads the woven bag, and then presses and prints the woven bag. However, such a processing mode has deficiencies. There is pressing and spreading treatment in the conveying direction of the woven bag, but there is no spreading force in the vertical direction. This may cause multiple wrinkles parallel to the conveying direction on the woven bag. Even if the wrinkles are not obvious, it may still affect the subsequent printing quality. In addition, during the spreading process, if the friction at the bottom of the pressing device is insufficient, it cannot give the woven bag enough spreading force, so the pressing device is doing useless work. If the bottom end of the pressing device is made of rubber material, although the spreading and pushing force is significantly increased, during the subsequent rising process of the pressing device, the bottom end of the pressing device may adhere to the woven bag, so that the printed woven bag will not be output along the specified route, and it will also affect the subsequent woven bag printing work. Summary of the Invention

[0003] The purpose of the present invention is to provide a surface printing device for woven bags to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A surface printing device for woven bags includes a printing device. Push foot devices are fixed at the four corner positions of the printing device. The push foot device includes a first plate, a control body, a first column, a return spring, a chassis, unit wheels, and a braking member. One side of the first plate is connected with the control body. A first column vertically penetrates one end of the control body. A return spring is sleeved on the first column. The bottom end of the first column is connected with the chassis. A plurality of evenly distributed unit wheels are arranged around the chassis. The return spring supports between the control body and the chassis. A braking member is distributed on one side of the printing device. The braking member includes a push shaft member, a shaft plate, a horizontal shaft member, a vertical shaft member, and a vertical rack. The shaft plate is fixed on the first plate. The shaft plate limits and supports the push shaft member and the horizontal shaft member, and the push shaft member and the horizontal shaft member are vertically driven. One side of the horizontal shaft member vertically drives the vertical shaft member and the vertical rack. One end of the push shaft member drives and controls the control body. The bottom end of the vertical rack is connected with the chassis, and the bottom end of the vertical shaft member drives and controls the chassis.

[0005] Preferably, the chassis includes a control cylinder, a middle plate, and a swivel plate. The control cylinder includes a cylinder body and convex teeth annularly provided on the outer side wall of the cylinder body. The bottom end of the control cylinder is fixed with a swivel plate, and the swivel plate is sleeved on a ring groove formed on the outer side wall of the middle plate. The bottom end of the first column is fixed on the middle plate. A plurality of uniformly distributed unit wheels are annularly provided on the swivel plate. The bottom end of the vertical rack is fixed at the edge of the middle plate, and the bottom end of the vertical shaft member is in transmission connection with the control cylinder.

[0006] Preferably, the vertical shaft member includes an upper support shaft, a lower support shaft, an L-shaped bottom plate, a first one-way bearing, and a first cylindrical gear. The structures of the upper support shaft and the lower support shaft are both a cylinder integrally connected to a half cylinder at one end. The half cylinders of the upper support shaft and the lower support shaft are in butt contact. The top end of the upper support shaft is in transmission connection with the horizontal shaft member. The bottom end of the lower support shaft is sleeved with a first one-way bearing, and the first cylindrical gear is sleeved outside the first one-way bearing. The first cylindrical gear meshes with the control cylinder. One end of the L-shaped bottom plate is fixed on the vertical rack, and the cylinder of the lower support shaft is sleeved in a through hole formed at the other end of the L-shaped bottom plate.

[0007] Preferably, the horizontal shaft member includes a first short shaft, a first short cylinder, a lifting plate frame, a third cylindrical gear, and a braking prism. One end of the first short shaft is in transmission with the push shaft member. The first short shaft is sleeved in a through hole formed on the shaft plate. The other end of the first short shaft is fixed with a braking prism, and the braking prism slides through a prism hole formed on the first short cylinder. The third cylindrical gear is fixedly sleeved outside the first short cylinder, and the third cylindrical gear meshes with the vertical rack. The first short cylinder is sleeved in a through hole formed on the lifting plate frame. The lifting plate frame is fixed on one side of the control body. The upper support shaft is sleeved in a second through hole formed on the lifting plate frame. The upper support shaft and the first short cylinder are vertically in transmission, and at the transmission part, the ends of the upper support shaft and the first short cylinder are both fixed with bevel gears. The braking prism slides through a prism hole formed on a bevel gear at one end of the first short cylinder.

[0008] Preferably, the pushing shaft member includes a spring reset mechanism, an intercepting seat, a first hairspring, a pressing shaft, a second cylindrical gear, and a second one-way bearing. The pressing shaft is sleeved in a through hole formed in the shaft plate. One end of the pressing shaft is vertically driven by a first short shaft, and conical gears are fixed to both the pressing shaft at the driving position and the end of the first short shaft. A second one-way bearing is fixedly sleeved at the other end of the pressing shaft, and a second cylindrical gear is fixedly sleeved outside the second one-way bearing. The intercepting seat and the spring reset mechanism are both fixed to one side of the shaft plate. The control body includes a cylinder and a horizontal plate integrally connected to one side of the cylinder. A convex block is provided on the inner wall of the cylinder of the control body. The cylinder of the control body is sleeved on the first column, and the convex blocks of the control body are distributed in a chute formed in the first column. A T-shaped chute is formed in the horizontal plate of the control body, and two rows of teeth are formed on the upper surface of the horizontal plate of the control body. One row of teeth meshes with the second cylindrical gear, and the tooth groove of the other row of teeth is a right-angle groove. One end of the intercepting seat is butted against the right-angle groove row of teeth of the control body. One end of the horizontal plate of the control body is connected to the spring reset mechanism, and the spring reset mechanism elastically supports between the shaft plate and the control body. The first plate includes an L-shaped plate and a T-shaped plate integrally connected to one end of the L-shaped plate. The T-shaped plate of the first plate is fitted in the T-shaped chute on the control body. The other end of the intercepting seat is distributed with a first hairspring, and the first hairspring is fixedly sleeved on the pressing shaft.

[0009] Preferably, the intercepting seat includes an L-shaped toothed plate, a second elastic piece, and an L-shaped reverse plate. One end of the L-shaped reverse plate is fixed to the shaft plate. The L-shaped reverse plate slides through a plate hole formed in the L-shaped toothed plate. A second elastic piece is fixed to one side of the L-shaped reverse plate. One end of the L-shaped toothed plate is provided with a row of right-angle teeth. The bottom end of the second elastic piece supports the L-shaped toothed plate, so that the right-angle tooth end of the L-shaped toothed plate meshes and butts against the control body.

[0010] Preferably, the unit wheel includes a block member, a pressing disc, an L-shaped double-control plate, a unit elastic piece, a unit vertical shaft, a brake rod, a guiding vertical cylinder, a unit hairspring, a roller frame, and a roller. The guiding vertical cylinder is sleeved in a through hole formed in the rotating ring plate. The top end of the guiding vertical cylinder is meshed and driven with a gear fixed to the bottom end of the unit vertical shaft through a fixed cylindrical gear. The top end of the unit vertical shaft is fixed with a pressing disc. The unit vertical shaft is sleeved in a fine hole formed in the L-shaped double-control plate. One end of the L-shaped double-control plate is fixed to the rotating ring plate. A block member is butted against one side of the pressing disc. The block member is distributed on the L-shaped double-control plate. A brake rod is distributed at the bottom end of the block member, and a unit elastic piece is fixedly connected between the block member and the brake rod. The brake rod slides through the inner hole of the guiding vertical cylinder. The bottom end of the guiding vertical cylinder penetrates through the housing of the roller frame. The roller frame supports and controls the roller. The bottom end of the brake rod controls the roller. A unit hairspring is fixedly sleeved outside the guiding vertical cylinder. The outermost ring end of the unit hairspring is fixed with an L-shaped frame, and one end of the L-shaped frame is fixed to the rotating ring plate.

[0011] Preferably, the clamping block member includes a crescent block, a compression spring and a pressing rod. The crescent blocks are distributed in the arc-shaped grooves formed on one side of the pressure plate. A pressing rod is fixed to the lower end of the crescent block, and the bottom end of the pressing rod is fixed to the unit spring piece. The pressing rod slides through the thick hole formed on the L-shaped double control plate, and the compression spring is sleeved on the pressing rod and supported between the L-shaped double control plate and the crescent block.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. When the printing device drives the pushing foot device to fall for printing, the four pushing foot devices respectively generate an external thrust on the four corners of the woven bag, ensuring that no reverse wrinkles will appear on the woven bag, and the woven bag is fully spread out, thereby improving the printing quality of the woven bag. After the printing is completed, when the pushing foot device rises and has not completely separated from the woven bag, all the unit wheels on the chassis move in a circular motion, and then the pushing foot device separates from the woven bag, so that the situation where the woven bag sticks to the pushing foot device will not occur.

[0014] 2. The pushing foot device of the present invention has multiple transmission modes, and the power for triggering the multiple modes of the pushing foot device to operate logically comes from the lifting of the first plate, stably realizing the integrated mechanical automation function of the pushing foot device. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the pushing foot device.

[0017] Figure 3 It is a schematic structural diagram of the braking member.

[0018] Figure 4 It is a schematic structural diagram of the chassis.

[0019] Figure 5 It is a schematic structural diagram of the vertical shaft member.

[0020] Figure 6 It is a schematic structural diagram of the pushing shaft member.

[0021] Figure 7 It is a schematic structural diagram of the intercepting seat.

[0022] Figure 8 It is a schematic structural diagram of the unit wheel.

[0023] Figure 9 It is a schematic structural diagram of the clamping block member.

[0024] Figure 10 It is a schematic structural diagram of the control body.

[0025] In the figure: printing device 1, pushing foot device 2, first plate 3, control body 4, first column 5, return spring 6, chassis 7, unit wheel 8, braking part 9, pushing shaft part 10, shaft plate 11, horizontal shaft part 12, vertical shaft part 13, vertical rack 14, control cylinder 15, middle plate 16, rotating ring plate 17, upper support shaft 18, lower support shaft 19, L-shaped bottom plate 20, first one-way bearing 21, first cylinder gear 22, spring return mechanism 23, intercepting seat 24, first hairspring 25, pressure roller 26, second cylinder gear 27, second one-way bearing 28, first short shaft 29, first short cylinder 30, lifting plate frame 31, third cylinder gear 32, braking prism 33, L-shaped tooth plate 34, second elastic piece 35, L-shaped reverse plate 36, clamping block part 37, pressure plate 38, L-shaped double control plate 39, unit elastic piece 40, unit vertical shaft 41, brake rod 42, guiding vertical cylinder 43, unit hairspring 44, roller frame 45, roller 46, crescent block 47, compression spring 48, pressing rod 49. Detailed implementation manner

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 to 10 , the present invention provides a technical solution: a surface printing device for woven bags, including a printing device 1. Pushing foot devices 2 are fixed at the four corner positions of the printing device 1. The pushing foot device 2 includes a first plate 3, a control body 4, a first column 5, a return spring 6, a chassis 7, a unit wheel 8 and a braking part 9. One side of the first plate 3 is connected with a control body 4. One end of the control body 4 vertically penetrates through a first column 5. A return spring 6 is sleeved on the first column 5. The bottom end of the first column 5 is connected with a chassis 7. A plurality of uniformly distributed unit wheels 8 are arranged on the circumference of the chassis 7. The return spring 6 supports between the control body 4 and the chassis 7. A braking part 9 is distributed on one side of the printing device 1. The braking part 9 includes a pushing shaft part 10, a shaft plate 11, a horizontal shaft part 12, a vertical shaft part 13 and a vertical rack 14. The shaft plate 11 is fixed on the first plate 3. The shaft plate 11 limits and supports the pushing shaft part 10 and the horizontal shaft part 12, and the pushing shaft part 10 and the horizontal shaft part 12 are vertically driven. One side of the horizontal shaft part 12 vertically drives the vertical shaft part 13 and the vertical rack 14. One end of the pushing shaft part 10 drives and controls the control body 4. The bottom end of the vertical rack 14 is connected with the chassis 7. The bottom end of the vertical shaft part 13 drives and controls the chassis 7.

[0028] The upper end of the printing device 1 is butted against the lifting mechanism in the prior art. Below the printing device 1 is a conveyor belt for transporting woven bags. The conveyor belt carries the woven bags. After the woven bags move to directly below the printing device 1, the printing device 1 descends to complete the printing work on the woven bags. During the descent of the printing device 1, the four push-foot devices 2 first come into contact with the four corners of the woven bag. As the printing device 1 drives the push-foot devices 2 to continue descending, when the push-foot devices 2 press the woven bag, the push-foot devices 2 deform themselves to exert an external force on the woven bag, and the four corners of the woven bag are pushed outwards horizontally. At this time, all the unit wheels 8 on a chassis 7 roll in the same direction, and the bottoms of the unit wheels 8 are in contact with the woven bag. All the unit wheels 8 work together to push one corner of the woven bag, so that the woven bag is completely pressed and spread out without wrinkles. After the printing of the woven bag is completed, the printing device 1 drives the push-foot devices 2 to rise. During the rising process, all the unit wheels 8 on the chassis 7 move in a circular motion together. In this way, if there is adhesion between the bottom of a single unit wheel 8 and the woven bag, it will also be separated due to the circular motion of all the unit wheels 8. Subsequently, the push-foot devices 2 are completely separated from the woven bag, and there will be no situation where the woven bag adheres to the push-foot devices 2.

[0029] The chassis 7 includes a control cylinder 15, a middle plate 16 and a rotating ring plate 17. The control cylinder 15 includes a cylinder body and convex teeth provided on the outer side wall of the cylinder body in a ring shape. The bottom end of the control cylinder 15 is fixed with the rotating ring plate 17. The rotating ring plate 17 is sleeved on a ring groove opened on the outer side wall of the middle plate 16. The bottom end of the first column 5 is fixed on the middle plate 16. A plurality of uniformly distributed unit wheels 8 are provided on the rotating ring plate 17 in a ring shape. The bottom end of the vertical rack 14 is fixed on the edge of the middle plate 16. The bottom end of the vertical shaft member 13 is in transmission connection with the control cylinder 15.

[0030] The vertical shaft member 13 includes an upper support shaft 18, a lower support shaft 19, an L-shaped bottom plate 20, a first one-way bearing 21 and a first cylindrical gear 22. The structures of the upper support shaft 18 and the lower support shaft 19 are both a cylinder with a semi-cylinder integrally connected at one end. The semi-cylinders of the upper support shaft 18 and the lower support shaft 19 are in butt contact. The top end of the upper support shaft 18 is in transmission connection with the horizontal shaft member 12. The bottom end of the lower support shaft 19 is sleeved with the first one-way bearing 21. The first cylindrical gear 22 is sleeved outside the first one-way bearing 21. The first cylindrical gear 22 meshes with the control cylinder 15. One end of the L-shaped bottom plate 20 is fixed on the vertical rack 14. The cylinder of the lower support shaft 19 is sleeved in a through hole opened at the other end of the L-shaped bottom plate 20.

[0031] The horizontal shaft member 12 includes a first short shaft 29, a first short cylinder 30, a lifting plate frame 31, a third cylinder gear 32, and a braking prism 33. One end of the first short shaft 29 is in transmission connection with the pushing shaft member 10. The first short shaft 29 is sleeved in a through hole opened on the shaft plate 11. A braking prism 33 is fixed to the other end of the first short shaft 29. The braking prism 33 slides through a prism hole opened on the first short cylinder 30. A third cylinder gear 32 is fixedly sleeved outside the first short cylinder 30. The third cylinder gear 32 meshes with the vertical rack 14. The first short cylinder 30 is sleeved in a through hole opened on the lifting plate frame 31. The lifting plate frame 31 is fixed to one side of the control body 4. The upper support shaft 18 is sleeved in a second through hole opened on the lifting plate frame 31. The upper support shaft 18 is in perpendicular transmission connection with the first short cylinder 30, and bevel gears are fixed to the ends of the upper support shaft 18 and the first short cylinder 30 at the transmission position. The braking prism 33 slides through a prism hole opened on a bevel gear at one end of the first short cylinder 30.

[0032] The pushing shaft member 10 includes a spring reset mechanism 23, an intercepting seat 24, a first clockwork spring 25, a pressing shaft 26, a second cylinder gear 27, and a second one-way bearing 28. The pressing shaft 26 is sleeved in a through hole opened on the shaft plate 11. One end of the pressing shaft 26 is in perpendicular transmission connection with the first short shaft 29, and bevel gears are fixed to the ends of the pressing shaft 26 and the first short shaft 29 at the transmission position. A second one-way bearing 28 is fixedly sleeved on the other end of the pressing shaft 26. A second cylinder gear 27 is fixedly sleeved outside the second one-way bearing 28. Both the intercepting seat 24 and the spring reset mechanism 23 are fixed to one side of the shaft plate 11. The control body 4 includes a cylinder and a cross plate integrally connected to one side of the cylinder. Protrusions are provided on the inner wall of the cylinder of the control body 4. The cylinder of the control body 4 is sleeved on the first column 5, and the protrusions of the control body 4 are distributed in a chute opened on the first column 5. A T-shaped chute is opened on the cross plate of the control body 4, and two rows of teeth are opened on the upper surface of the cross plate of the control body 4. One row of teeth meshes with the second cylinder gear 27, and the tooth groove of the other row of teeth is a right-angle groove. One end of the intercepting seat 24 is butted against the right-angle groove row of teeth of the control body 4. One end of the cross plate of the control body 4 is connected to the spring reset mechanism 23. The spring reset mechanism 23 elastically propping between the shaft plate 11 and the control body 4. The first plate 3 includes an L-shaped plate and a T-shaped plate integrally connected to one end of the L-shaped plate. The T-shaped plate of the first plate 3 is fitted in the T-shaped chute on the control body 4. The other end of the intercepting seat 24 is distributed with a first clockwork spring 25. The first clockwork spring 25 is fixedly sleeved on the pressing shaft 26.

[0033] The intercepting seat 24 includes an L-shaped toothed plate 34, a second elastic piece 35, and an L-shaped reverse plate 36. One end of the L-shaped reverse plate 36 is fixed to the shaft plate 11. The L-shaped reverse plate 36 slides through a plate hole opened on the L-shaped toothed plate 34. A second elastic piece 35 is fixed to one side of the L-shaped reverse plate 36. One end of the L-shaped toothed plate 34 is provided with a row of right-angle teeth. The bottom end of the second elastic piece 35 props against the L-shaped toothed plate 34, so that the right-angle tooth end of the L-shaped toothed plate 34 meshes and butts against the control body 4.

[0034] The unit wheel 8 includes a clamping block member 37, a pressure plate 38, an L-shaped double-control plate 39, a unit elastic piece 40, a unit vertical shaft 41, a brake rod 42, a guiding vertical cylinder 43, a unit spring 44, a roller frame 45 and a roller 46. The guiding vertical cylinder 43 is sleeved in a through hole formed in the rotating ring plate 17. The top end of the guiding vertical cylinder 43 is in meshing transmission with a gear fixed to the bottom end of the unit vertical shaft 41 through a fixed cylinder gear. The top end of the unit vertical shaft 41 is fixed with the pressure plate 38. The unit vertical shaft 41 is sleeved in a fine hole formed in the L-shaped double-control plate 39. One end of the L-shaped double-control plate 39 is fixed to the rotating ring plate 17. One side of the pressure plate 38 is butted against the clamping block member 37. The clamping block members 37 are distributed on the L-shaped double-control plate 39. The bottom ends of the clamping block members 37 are distributed with the brake rods 42. A unit elastic piece 40 is fixedly connected between the clamping block members 37 and the brake rods 42. The brake rods 42 slide through the inner hole of the guiding vertical cylinder 43. The bottom end of the guiding vertical cylinder 43 penetrates through the housing of the roller frame 45. The roller frame 45 supports and controls the roller 46. The bottom end of the brake rod 42 controls the roller 46. A unit spring 44 is fixedly sleeved outside the guiding vertical cylinder 43. The outermost ring end of the unit spring 44 is fixed with an L-shaped frame, and one end of the L-shaped frame is fixed to the rotating ring plate 17.

[0035] The clamping block member 37 includes a crescent block 47, a compression spring 48 and a pressure rod 49. The crescent blocks 47 are distributed in arc-shaped grooves formed on one side of the pressure plate 38. The lower end of the crescent block 47 is fixed with the pressure rod 49. The bottom end of the pressure rod 49 is fixed to the unit elastic piece 40. The pressure rod 49 slides through a thick hole formed in the L-shaped double-control plate 39. The compression spring 48 is sleeved on the pressure rod 49, and the compression spring 48 is supported between the L-shaped double-control plate 39 and the crescent block 47.

[0036] During the process of the printing device 1 driving the pushing foot device 2 to print and fall, the chassis 7 drives the circumferentially arranged unit wheels 8 to first fall and contact the woven bag. During the continuous falling process, the unit wheels 8 are closely attached to the woven bag, and all the unit wheels 8 on the chassis 7 move along the same direction. Refer to Figure 2 , what is shown is the state where all the unit wheels 8 are evenly circumferentially arranged. When the chassis 7 translates above the woven bag, the rollers 46 on all the unit wheels 8 remain parallel. After keeping parallel, it is difficult for the rollers 46 to rotate because the movement blocking mechanism in the unit wheel 8 is triggered and it is difficult for the rollers 46 to rotate. However, the chassis 7 drives all the unit wheels 8 to translate, so that friction occurs between the rollers 46 and the woven bag. All the parallel rollers 46 under one chassis 7 act together to generate a flat pushing force on the woven bag. This is the force-bearing situation at one corner of the woven bag. The force-bearing modes at the four corners of the woven bag are the same, and four evenly outward-pushing forces are generated at the four corners of the woven bag, so that the woven bag is pressed tightly and fully spread out.

[0037] During the process of the pushing foot device 2 falling along with the printing device 1, the deformation distance process on the pushing foot device 2 is as follows. Refer to Figure 2 and Figure 3, after the bottom end of the unit wheel 8 contacts the woven bag, the downward movement of the first plate 3 will cause the control body 4 to move to the right. Because the first plate 3 drives the control body 4 to fall, the chassis 7 cannot continue to fall, and the control body 4 will fall relative to the first column 5. Refer to Figure 4 , Figure 5 and Figure 6 , the vertical rack 14, the middle plate 16 and the first column 5 are fixed as a whole. The horizontal shaft member 12 falls with the control body 4. In this way, the third cylinder gear 32 continuously rotates to drive the first short cylinder 30, and then drives the first short shaft 29 through the brake prism 33. Then, the rotation of the second one-way bearing 28 is controlled by the feed pressing shaft 26, causing the control body 4 to move horizontally. During the downward movement of the control body 4 along with the first plate 3, the control body 4 moves horizontally again. Then, the chassis 7 is controlled by the first column 5, and the horizontal movement of the chassis 7 controls all the unit wheels 8. In this way, the horizontal thrust makes all the rollers 46 parallel and then move in the same direction. At this time, the rollers 46 can be understood as being in a semi-rolling and semi-translating state, and the braking mechanism in each unit wheel 8 is triggered.

[0038] After the printing work is completed, the printer 1 drives all the push foot devices 2 to rise. During the separation stage between the push foot devices 2 and the woven bag, all the unit wheels 8 on one chassis 7 move in a circular motion. Refer to Figure 2 the state shown. In this state, the braking mechanism in the unit wheel 8 does not operate, and the rollers 46 are in a free rolling state. After all the unit wheels 8 move in a circular motion in this way, all the unit wheels 8 rise at the same time, and there will be no adhesion between the unit wheels 8 and the woven bag. After the unit wheels 8 are separated from the woven bag, the control body 4 will move horizontally in the opposite direction to reset, and finally the push foot devices 2 complete the deformation reset.

[0039] The specific transmission for the printer 1 to drive the push foot devices 2 to rise is that the lifting plate frame 31 rises with the control body 4, and the third cylinder gear 32 rises relative to the vertical rack 14. Refer to Figure 6 , the third cylinder gear 32 rotates counterclockwise to drive the brake prism 33, which causes the upper support shaft 18 to rotate clockwise through transmission. And the path of the control body 4 is interrupted by the feed pressing shaft 26 and the second one-way bearing 28 through transmission, because Figure 6 in, the feed pressing shaft 26 cannot drive the second one-way bearing 28 through the second cylinder gear 27 when rotating clockwise, and the feed pressing shaft 26 can drive the second one-way bearing 28 through the second cylinder gear 27 when rotating counterclockwise. This mechanism can ensure that during the rising process of the push foot devices 2, the chassis 7 and the unit wheels 8 will not translate, and the unit wheels 8 can only move in a circular motion first. Then, the unit wheels 8 rise. After the unit wheels 8 are completely separated from the woven bag, the control body 4 will start to move for reset, because Figure 6In it, when the finale 26 is rotated clockwise by a sufficient number of turns, the first spring 25 will have sufficient force to support the L-shaped toothed plate 34, causing the L-shaped toothed plate 34 to rise against the thrust of the second elastic piece 35. When the distance between the chassis 7 and the control body 4 is the largest, the thrust generated by the first spring 25 rotating clockwise will be sufficient to lift the L-shaped toothed plate 34, and the first spring 25 rotating counterclockwise will never affect the L-shaped toothed plate 34. Once the L-shaped toothed plate 34 rises, it will no longer block and intercept the control body 4. Under the rebound and thrust of the spring reset mechanism 23, the control body 4 will move leftward relative to the first plate 3. Here, refer to Figure 3 , during the rising process of the pushing foot device 2, the deformation reset of the pushing foot device 2 itself is not exactly the opposite of the deformation when the pushing foot device 2 falls, but the pushing foot device 2 will eventually be completely deformed and reset, and return to the rotation stage of the upper support shaft 18. Refer to Figures 3 to 6 Understand that the clockwise rotation of the upper support shaft 18 drives the lower support shaft 19 and the first cylindrical gear 22, causing the control cylinder 15 to rotate counterclockwise, which will result in Figure 3 the surrounding motion state of the middle unit wheel 8. This state occurs during the rising stage of the pushing foot device 2, and the bottom end of the pushing foot device 2 does not separate from the woven bag during the process.

[0040] The principle of the braking mechanism on the unit wheel 8 is that all the rollers 46 maintain the state shown in the figure of the pushing shaft part 10, and the braking mechanism does not operate. In other states, the rollers 46 will have difficulty rolling. Refer to Figure 8 and Figure 9 , which is the state where the braking mechanism does not operate. Once the whole formed by the guiding vertical cylinder 43 and the roller frame 45 rotates, it will cause the unit vertical shaft 41 and the pressure plate 38 to rotate. In this way, the pressure plate 38 and the crescent block 47 slide out of alignment, and the crescent block 47 drives the pressing rod 49 to fall. Subsequently, the braking rod 42 is controlled to fall by the unit elastic piece 40. The bottom end of the braking rod 42 supports the roller 46, and the contact friction inhibits the rolling of the roller 46, triggering the braking mechanism.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface printing device for a woven bag, comprising a printer (1), characterized in that: At the four corners of the printing device (1), pushing foot devices (2) are fixed. The pushing foot device (2) includes a first plate (3), a control body (4), a first column (5), a return spring (6), a chassis (7), a unit wheel (8) and a braking member (9). On one side of the first plate (3), a control body (4) is connected. One end of the control body (4) vertically penetrates through a first column (5). A return spring (6) is sleeved on the first column (5). The bottom end of the first column (5) is connected to a chassis (7). A plurality of uniformly distributed unit wheels (8) are arranged on the circumference of the chassis (7). The return spring (6) is supported between the control body (4) and the chassis (7). On one side of the printing device (1), a braking member (9) is distributed. The braking member (9) includes a pushing shaft member (10), a shaft plate (11), a horizontal shaft member (12), a vertical shaft member (13) and a vertical rack (14). The shaft plate (11) is fixed on the first plate (3). The shaft plate (11) limits and supports the pushing shaft member (10) and the horizontal shaft member (12), and the pushing shaft member (10) and the horizontal shaft member (12) are vertically driven. On one side of the horizontal shaft member (12), a vertical shaft member (13) and a vertical rack (14) are vertically driven. One end of the pushing shaft member (10) drives and controls the control body (4). The bottom end of the vertical rack (14) is connected to the chassis (7). The bottom end of the vertical shaft member (13) drives and controls the chassis (7); The chassis (7) includes a control cylinder (15), a middle plate (16) and a rotating ring plate (17). The control cylinder (15) includes a cylinder body and convex teeth arranged on the outer side wall of the cylinder body. The bottom end of the control cylinder (15) is fixed with a rotating ring plate (17). The rotating ring plate (17) is sleeved on a ring groove formed on the outer side wall of the middle plate (16). The bottom end of the first column (5) is fixed on the middle plate (16). A plurality of uniformly distributed unit wheels (8) are arranged on the circumference of the rotating ring plate (17). The bottom end of the vertical rack (14) is fixed on the edge of the middle plate (16). The bottom end of the vertical shaft member (13) is drivingly connected to the control cylinder (15); The unit wheel (8) includes a clamping block member (37), a pressure plate (38), an L-shaped dual-control plate (39), a unit elastic sheet (40), a unit vertical shaft (41), a brake rod (42), a guiding vertical cylinder (43), a unit spring (44), a roller frame (45) and a roller (46). The guiding vertical cylinder (43) is sleeved in a through hole opened on the rotating ring plate (17). The top end of the guiding vertical cylinder (43) is in meshing transmission with a gear fixed to the bottom end of the unit vertical shaft (41) through a fixed cylinder gear. The top end of the unit vertical shaft (41) is fixed with a pressure plate (38). The unit vertical shaft (41) is sleeved in a fine hole opened on the L-shaped dual-control plate (39). One end of the L-shaped dual-control plate (39) is fixed on the rotating ring plate (17). One side of the pressure plate (38) is butted with a clamping block member (37). The clamping block members (37) are distributed on the L-shaped dual-control plate (39). The bottom ends of the clamping block members (37) are distributed with brake rods (42). A unit elastic sheet (40) is fixedly connected between the clamping block members (37) and the brake rods (42). The brake rods (42) slide through the inner hole of the guiding vertical cylinder (43). The bottom end of the guiding vertical cylinder (43) penetrates through the housing of the roller frame (45). The roller frame (45) supports and controls the roller (46). The bottom end of the brake rod (42) controls the roller (46). A unit spring (44) is fixedly sleeved outside the guiding vertical cylinder (43). The outermost ring end of the unit spring (44) is fixed with an L-shaped frame, and one end of the L-shaped frame is fixed on the rotating ring plate (17); The clamping block member (37) includes a crescent block (47), a compression spring (48) and a pressure rod (49). The crescent blocks (47) are distributed in an arc-shaped groove opened on one side of the pressure plate (38). The lower end of the crescent block (47) is fixed with a pressure rod (49). The bottom end of the pressure rod (49) is fixed on the unit elastic sheet (40). The pressure rod (49) slides through a thick hole opened on the L-shaped dual-control plate (39). The compression spring (48) is sleeved on the pressure rod (49), and the compression spring (48) is supported between the L-shaped dual-control plate (39) and the crescent block (47).

2. The surface printing device for a woven bag according to claim 1, characterized in that: The vertical shaft member (13) includes an upper support shaft (18), a lower support shaft (19), an L-shaped bottom plate (20), a first one-way bearing (21) and a first cylinder gear (22). The structures of the upper support shaft (18) and the lower support shaft (19) are both a cylinder integrally connected with a semi-cylinder at one end. The semi-cylinders of the upper support shaft (18) and the lower support shaft (19) are in butted contact. The top end of the upper support shaft (18) is in transmission connection with the horizontal shaft member (12). The bottom end of the lower support shaft (19) is sleeved with a first one-way bearing (21). The outside of the first one-way bearing (21) is sleeved with a first cylinder gear (22). The first cylinder gear (22) is in meshing with the control cylinder (15). One end of the L-shaped bottom plate (20) is fixed on the vertical rack (14). The cylinder of the lower support shaft (19) is sleeved in a through hole opened at the other end of the L-shaped bottom plate (20).

3. The surface printing device for a woven bag according to claim 2, wherein: The horizontal shaft member (12) includes a first short shaft (29), a first short cylinder (30), a lifting plate frame (31), a third cylinder gear (32) and a braking prism (33). One end of the first short shaft (29) is in transmission connection with the push shaft member (10). The first short shaft (29) is sleeved in a through hole opened on the shaft plate (11). A braking prism (33) is fixed to the other end of the first short shaft (29). The braking prism (33) slides through a prism hole opened on the first short cylinder (30). A third cylinder gear (32) is fixedly sleeved outside the first short cylinder (30). The third cylinder gear (32) meshes with the vertical rack (14). The first short cylinder (30) is sleeved in a through hole opened on the lifting plate frame (31). The lifting plate frame (31) is fixed to one side of the control body (4). The upper support shaft (18) is sleeved in a second through hole opened on the lifting plate frame (31). The upper support shaft (18) is in vertical transmission connection with the first short cylinder (30). At the transmission part, both the end of the upper support shaft (18) and the end of the first short cylinder (30) are fixed with bevel gears. The braking prism (33) slides through a prism hole opened on a bevel gear at one end of the first short cylinder (30).

4. The surface printing device for a woven bag according to claim 3, characterized in that: The push shaft member (10) includes a spring reset mechanism (23), an intercepting seat (24), a first clockwork spring (25), a feeding shaft (26), a second cylinder gear (27) and a second one-way bearing (28). The feeding shaft (26) is sleeved in a through hole opened on the shaft plate (11). One end of the feeding shaft (26) is in vertical transmission connection with the first short shaft (29). At the transmission part, both the end of the feeding shaft (26) and the end of the first short shaft (29) are fixed with bevel gears. A second one-way bearing (28) is fixedly sleeved at the other end of the feeding shaft (26). A second cylinder gear (27) is fixedly sleeved outside the second one-way bearing (28). Both the intercepting seat (24) and the spring reset mechanism (23) are fixed to one side of the shaft plate (11). The control body (4) includes a cylinder body and a horizontal plate integrally connected to one side of the cylinder body. Convex blocks are provided on the inner wall of the cylinder body of the control body (4). The cylinder body of the control body (4) is sleeved on the first column (5). And the convex blocks of the control body (4) are distributed in a sliding groove opened on the first column (5). A T-shaped sliding groove is opened on the horizontal plate of the control body (4). And two rows of teeth are opened on the upper surface of the horizontal plate of the control body (4). One row of teeth meshes with the second cylinder gear (27). And the tooth groove of the other row of teeth is a right-angle groove. One end of the intercepting seat (24) is butted against the right-angle groove row of teeth of the control body (4). One end of the horizontal plate of the control body (4) is connected to the spring reset mechanism (23). The spring reset mechanism (23) elastically supports between the shaft plate (11) and the control body (4). The first plate (3) includes an L-shaped plate and a T-shaped plate integrally connected to one end of the L-shaped plate. The T-shaped plate of the first plate (3) is fitted in the T-shaped sliding groove on the control body (4). The other end of the intercepting seat (24) is distributed with a first clockwork spring (25). The first clockwork spring (25) is fixedly sleeved on the feeding shaft (26).

5. The surface printing device for a woven bag according to claim 4, characterized in that: The interception seat (24) includes an L-shaped toothed plate (34), a second elastic sheet (35) and an L-shaped reverse plate (36). One end of the L-shaped reverse plate (36) is fixed on the shaft plate (11). The L-shaped reverse plate (36) slides through a plate hole formed in the L-shaped toothed plate (34). A second elastic sheet (35) is fixed on one side of the L-shaped reverse plate (36). A row of right-angle teeth is arranged at one end of the L-shaped toothed plate (34). The bottom end of the second elastic sheet (35) propping against the L-shaped toothed plate (34) enables the right-angle tooth end of the L-shaped toothed plate (34) to be meshed and docked with the control body (4).

Images