A pneumatic last-pulling method

Abstract

This invention provides a pneumatic shoe lasting method, in which a frame is equipped with a horizontally moving shoe support mechanism and a vertically moving shoe lasting mechanism. The horizontally moving shoe support mechanism and the vertically moving shoe lasting mechanism are linked by a cam mechanism. Due to the cam mechanism, during operation, the horizontal movement mechanism of the shoe support and the vertical movement mechanism of the shoe lasting hook start and stop moving simultaneously. This allows the horizontal movement trajectory of the shoe support mechanism and the vertical movement trajectory of the shoe lasting hook to be combined into a movement curve trajectory of the shoe lasting hook relative to the shoe model to be lasted, thus enabling the pneumatic lasting of different shoe models.

Description

Technical Field

[0001] This invention belongs to the field of shoe machinery technology; specifically, it relates to a pneumatic last-pulling method. Background Technology

[0002] Existing shoe last pulling methods can be categorized into three types based on their transmission methods: mechanical transmission, hydraulic transmission, and pneumatic transmission. The problems with existing mechanical transmission methods are: 1. Low standardization of parts; 2. High machining difficulty and long manufacturing cycle; 3. Low transmission efficiency and high energy consumption. The problems with existing hydraulic transmission methods are: 1. The pulling action is a synthesis of the actions of two cylinders, and the trajectory is uncertain due to fluctuations in hydraulic oil viscosity; 2. Changes in shoe size affect the quality of the pulling action, preventing successful last pulling; 3. Complex machine structure and high manufacturing cost; 4. Difficult adjustment; 5. Environmental pollution when the hydraulic system leaks. The problems with existing pneumatic transmission methods are: 1. The pulling action is a synthesis of the actions of two cylinders, and the trajectory is uncertain due to fluctuations in air pressure; 2. Changes in shoe size affect the quality of the pulling action, preventing successful last pulling; 3. Complex machine structure and high manufacturing cost; 4. Difficult adjustment.

[0003] In the shoemaking process, after the shoe is formed, the shoe last needs to be removed from the formed shoe. Existing technology (CN207152058U) discloses an automatic shoe last removal method, but it actually involves first activating a downward pressing cylinder, which uses a pressing block to press down the front end of the shoe last, causing the heel to detach from the last. Then, an upward pressing cylinder is activated, and an upward pressing block lifts the head of the shoe last, causing the front end of the shoe last to detach from the last, thus completing the last removal. This requires two vertical movements to complete the process, reducing work efficiency. Another existing technology (CN2174066Y) discloses a hydraulic last removal method. Besides the electric motor, working head, and last-hanging device, its transmission control device mainly consists of a hydraulic system composed of an oil pump, control valve, and working cylinder, and a mechanical part composed of a linkage plate, guide sleeve, guide rod, return spring, and foot pedal. The lasting process is a fixed-curve motion, rather than breaking down the lasting action into horizontal and vertical movements through a guide rod. This fixed-curve motion lasting operation is not suitable for lasting different shoe types. Summary of the Invention

[0004] To address the technical problems of low efficiency and inability to adapt to different shoe types in existing last-pulling operations, this invention provides a last-pulling method suitable for different shoe types.

[0005] This invention is achieved in the following manner: a pneumatic last-pulling method, comprising the following steps:

[0006] ① Fix the shoes to be lasted onto the shoe rack on the machine frame using the existing method;

[0007] ② Determine the movement curve trajectory of the last-pulling hook relative to the shoe model to be lasted;

[0008] ③ The movement trajectory of the last-pulling hook relative to the shoe to be lasted is decomposed into a horizontal movement trajectory and a vertical movement trajectory;

[0009] ④ Set up a horizontal moving mechanism for the shoe support to be fixed and pulled. When working, the horizontal moving mechanism of the shoe support moves according to the moving curve trajectory of the pulling hook.

[0010] ⑤ Set up a vertical movement mechanism for the shoe last pull hook, so that when working, the vertical movement mechanism of the shoe last pull hook moves according to the movement curve trajectory of the shoe last pull hook, which is decomposed into a vertical movement trajectory.

[0011] ⑥ During operation, the horizontal moving mechanism of the shoe last and the vertical moving mechanism of the last-pulling hook start moving and stop moving at the same time. This makes the horizontal moving trajectory of the shoe last and the vertical moving trajectory of the last-pulling hook combined into the moving curve trajectory of the last-pulling hook relative to the shoe of the model to be lasted, thus removing the shoe last from the shoe.

[0012] ⑦ Disconnect the last hook from the shoe last and remove the shoe from the shoe support, then repeat the above steps.

[0013] In step ⑥, a reciprocating cam mechanism is set between the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook. The reciprocating cam mechanism makes the horizontal moving trajectory of the shoe support horizontal moving mechanism and the vertical moving trajectory of the last-pulling hook vertical moving mechanism combine to form the moving curve trajectory of the last-pulling hook relative to the shoe of the last-pulling model.

[0014] The reciprocating cam mechanism causes the shoe support horizontal movement mechanism to move horizontally and the last-pulling hook vertical movement mechanism to move vertically. The vertical movement mechanism of the last-pulling hook is fixed with a cam, and the shoe support horizontal movement mechanism is equipped with rollers. The cam fixed in the vertical movement mechanism acts as a driving element, driving the rollers in the shoe support horizontal movement mechanism to move horizontally as a driven element.

[0015] The contour line of the contact surface between the cam and the roller is the moving curve trajectory of the lasting hook of the shoe model to be lasted relative to the shoe model to be lasted. Different moving curve trajectories correspond to different shoe models.

[0016] Step ④ sets up a horizontal moving mechanism for fixing the shoe upper of the shoe to be lasted. When working, the horizontal moving mechanism of the shoe upper moves according to the moving curve trajectory of the last-lasting hook, which is decomposed into a horizontal moving trajectory. The horizontal moving mechanism of the shoe upper is connected to the telescopic head of the horizontal servo telescopic mechanism, and the horizontal servo telescopic mechanism is controlled to make its telescopic head move according to the moving curve trajectory of the last-lasting hook, which is decomposed into a horizontal moving trajectory.

[0017] Step ⑤ sets up a vertical moving mechanism for the shoe last pull hook. When working, the vertical moving mechanism of the pull hook moves according to the moving curve trajectory of the pull hook, which is decomposed into a vertical moving trajectory. The telescopic head of the vertical servo telescopic mechanism is connected to the pull hook. The vertical servo telescopic mechanism is controlled to make its telescopic head move according to the moving curve trajectory of the pull hook, which is decomposed into a vertical moving trajectory.

[0018] In step ⑥, the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook start and stop moving simultaneously. This allows the horizontal moving trajectory of the shoe support to be combined with the vertical moving trajectory of the last-pulling hook to form the moving curve trajectory of the last-pulling hook relative to the shoe model to be lasted. This is achieved by simultaneously controlling the horizontal servo telescopic mechanism to move its telescopic head according to the moving curve trajectory of the last-pulling hook, which is decomposed into a horizontal moving trajectory, and the vertical servo telescopic mechanism to move its telescopic head according to the moving curve trajectory of the last-pulling hook, which is decomposed into a vertical moving trajectory.

[0019] The horizontal servo telescopic mechanism is a horizontal servo electric telescopic rod, and the vertical servo telescopic mechanism is a vertical servo electric telescopic rod.

[0020] The horizontal servo telescopic mechanism is a horizontal servo hydraulic rod, and the vertical servo telescopic mechanism is a vertical servo hydraulic rod.

[0021] The horizontal servo telescopic mechanism is a horizontal servo pneumatic rod, and the vertical servo telescopic mechanism is a vertical servo pneumatic rod.

[0022] Compared with the prior art, the technical effect of the present invention is that: during operation, the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook start moving and stop moving at the same time, so that the horizontal moving trajectory of the shoe support horizontal moving mechanism and the vertical moving trajectory of the last-pulling hook vertical moving mechanism are combined into the moving curve trajectory of the last-pulling hook relative to the shoe model to be lasted, thus making it suitable for different models of shoes to be lasted. Specifically, the contour line of the contact surface between the cam and the roller is the moving curve trajectory of the last-pulling hook relative to the shoe model to be lasted. Different moving curve trajectories correspond to different shoe models, thus enabling the lasts of different shoe models to be pulled out. Similarly, simultaneously controlling the horizontal servo telescopic mechanism to make its telescopic head move according to the moving curve trajectory of the last-pulling hook (decomposed into a horizontal movement trajectory) and the vertical servo telescopic mechanism to make its telescopic head move according to the moving curve trajectory of the last-pulling hook (decomposed into a vertical movement trajectory) can also remove the lasts of different shoe models. During operation, the horizontal movement mechanism of the shoe support and the vertical movement mechanism of the last-pulling hook start and stop moving simultaneously, which improves efficiency compared to the two sequential actions in the prior art. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pull-out structure of the present invention.

[0024] Figure 2 This is a pneumatic principle diagram of the present invention.

[0025] Figure 3 This is a schematic diagram of the overall drawing structure of the present invention.

[0026] Figure 1 In the diagram, 31 is the frame of the shoe lasting machine, 200 is the standard cylinder, 300 is the starting device, 4 is the horizontal guide rail pair, 11 is the cam, 28 is the shoe lasting hook, 19 is the heel support, and 24 is the toe support.

[0027] Figure 2 In the diagram, 1000 is the compressed air source, 2000 is the manual slide valve, 3000 is the pneumatic triplet, 4000 is the foot valve (normally closed 2-position 5-way valve) which is pressed with the knee, 5000 is the pneumatic 2-position 5-way delayed reversing valve, 6000 is the one-way speed control valve A, 7000 is the one-way speed control valve B, and 200 is the standard cylinder.

[0028] Figure 3In the diagram, 1 is the cylinder piston, 2 is the spreader, 3 is the tie rod, 4 is the optical axis track, 5 is the cam support, 51 is the cam connecting rod, 6 is pin C, 7 is the cam bracket E, 8 is pin D, 9 is the guide roller, 10 is the cam bracket F, 11 is the cam, 111 is the guide surface, 12 is the spherical connecting sleeve, 13 is the spherical connector, 14 is the positive and negative adjusting nut, 15 is the rear heel support rod, and 16 is the rear heel support locking block. 7 is the heel support adjustment shaft, 18 is the heel support bracket, 19 is the heel support, 20 is the special inspection leather shoe, 21 is the locking wrench pull hook, 22 is the toe support adjustment shaft, 23 is the toe support support plate, 24 is the toe support, 25 is the toe support support base, 26 is the locking bolt, 27 is the toe support support rod, 28 is the last pulling hook, 29 is the shoe support base, 30 is the ball bearing slider, 31 is the worktable plate, and 32 is the return tension spring. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0030] A pneumatic last-pulling method includes the following steps:

[0031] ① Fix the shoes to be lasted onto the shoe rack on the machine frame using the existing method;

[0032] ② Determine the movement curve trajectory of the last-pulling hook relative to the shoe model to be lasted;

[0033] ③ The movement trajectory of the last-pulling hook relative to the shoe to be lasted is decomposed into a horizontal movement trajectory and a vertical movement trajectory;

[0034] ④ Set up a horizontal moving mechanism for the shoe support to be fixed and pulled. When working, the horizontal moving mechanism of the shoe support moves according to the moving curve trajectory of the pulling hook.

[0035] ⑤ Set up a vertical movement mechanism for the shoe last pull hook, so that when working, the vertical movement mechanism of the shoe last pull hook moves according to the movement curve trajectory of the shoe last pull hook, which is decomposed into a vertical movement trajectory.

[0036] ⑥ During operation, the horizontal moving mechanism of the shoe last and the vertical moving mechanism of the last-pulling hook start moving and stop moving at the same time. This makes the horizontal moving trajectory of the shoe last and the vertical moving trajectory of the last-pulling hook combined into the moving curve trajectory of the last-pulling hook relative to the shoe of the model to be lasted, thus removing the shoe last from the shoe.

[0037] ⑦ Disconnect the last hook from the shoe last and remove the shoe from the shoe support, then repeat the above steps.

[0038] In step ⑥, a reciprocating cam mechanism is set between the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook. The reciprocating cam mechanism makes the horizontal moving trajectory of the shoe support horizontal moving mechanism and the vertical moving trajectory of the last-pulling hook vertical moving mechanism combine to form the moving curve trajectory of the last-pulling hook relative to the shoe of the last-pulling model.

[0039] The reciprocating cam mechanism causes the shoe support horizontal movement mechanism to move horizontally and the last-pulling hook vertical movement mechanism to move vertically. The vertical movement mechanism of the last-pulling hook is fixed with a cam, and the shoe support horizontal movement mechanism is equipped with rollers. The cam fixed in the vertical movement mechanism acts as a driving element, driving the rollers in the shoe support horizontal movement mechanism to move horizontally as a driven element.

[0040] The contour line of the contact surface between the cam and the roller is the moving curve trajectory of the lasting hook of the shoe model to be lasted relative to the shoe model to be lasted. Different moving curve trajectories correspond to different shoe models.

[0041] Step ④ sets up a horizontal moving mechanism for fixing the shoe upper of the shoe to be lasted. When working, the horizontal moving mechanism of the shoe upper moves according to the moving curve trajectory of the last-lasting hook, which is decomposed into a horizontal moving trajectory. The horizontal moving mechanism of the shoe upper is connected to the telescopic head of the horizontal servo telescopic mechanism, and the horizontal servo telescopic mechanism is controlled to make its telescopic head move according to the moving curve trajectory of the last-lasting hook, which is decomposed into a horizontal moving trajectory.

[0042] Step ⑤ sets up a vertical moving mechanism for the shoe last pull hook. When working, the vertical moving mechanism of the pull hook moves according to the moving curve trajectory of the pull hook, which is decomposed into a vertical moving trajectory. The telescopic head of the vertical servo telescopic mechanism is connected to the pull hook. The vertical servo telescopic mechanism is controlled to make its telescopic head move according to the moving curve trajectory of the pull hook, which is decomposed into a vertical moving trajectory.

[0043] In step ⑥, the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook start and stop moving simultaneously. This allows the horizontal moving trajectory of the shoe support to be combined with the vertical moving trajectory of the last-pulling hook to form the moving curve trajectory of the last-pulling hook relative to the shoe model to be lasted. This is achieved by simultaneously controlling the horizontal servo telescopic mechanism to move its telescopic head according to the moving curve trajectory of the last-pulling hook, which is decomposed into a horizontal moving trajectory, and the vertical servo telescopic mechanism to move its telescopic head according to the moving curve trajectory of the last-pulling hook, which is decomposed into a vertical moving trajectory.

[0044] The horizontal servo telescopic mechanism is a horizontal servo electric telescopic rod, and the vertical servo telescopic mechanism is a vertical servo electric telescopic rod.

[0045] The horizontal servo telescopic mechanism is a horizontal servo hydraulic rod, and the vertical servo telescopic mechanism is a vertical servo hydraulic rod.

[0046] The horizontal servo telescopic mechanism is a horizontal servo pneumatic rod, and the vertical servo telescopic mechanism is a vertical servo pneumatic rod.

[0047] The following are the devices used to implement the above methods:

[0048] like Figures 1-3 As shown, this invention provides a pneumatic shoe last pulling machine, including a frame. The frame is equipped with a horizontally moving shoe support mechanism and a vertically moving shoe last pulling mechanism. The horizontally moving shoe support mechanism and the vertically moving shoe last pulling mechanism are linked by a cam mechanism or by a horizontal servo electric actuator (not shown in the figure) connected to the horizontally moving shoe support mechanism, and a vertically moving shoe last pulling mechanism connected to a vertical servo electric actuator (not shown in the figure), thus realizing the linkage between the horizontally moving shoe support mechanism and the vertically moving shoe last pulling mechanism. Of course, the servo electric actuator can also be a servo cylinder or a servo hydraulic cylinder.

[0049] To better secure the shoes to be lasted, the horizontally movable shoe support mechanism includes a shoe support base 29. A horizontal guide rail pair 4 is provided between the shoe support base 29 and the frame 31. The horizontal guide rail pair 4 is a smooth rod guide rail with two linear bearings fixed parallel to each other on the frame 31. Each linear bearing smooth rod guide rail is fitted with two linear bearing sleeves. Each linear bearing sleeve fixes a slider to form a ball bearing slider 30. Four ball bearing sliders 30 are fixed below the shoe support base 29. A toe support support rod 27 and a heel support support rod 15 are fixed on the shoe support base 29. A toe support 24 is fixed on the toe support support rod 27, and a heel support 19 is fixed on the heel support support rod 15. The heel support 19 and the toe support 24 form the shoe support. The heel support 19 and the toe support 24 are of their existing shapes, which can secure the shoes to be lasted.

[0050] To better facilitate the pull hook in pulling out the shoe last, the vertically moving last-pulling mechanism includes a cam 11 fixed to the cylinder piston head 1. The cylinder piston head 1 fixes a spreader 2, and the right end of the spreader 2 is fixed to the cam 11 via a cam support 5. The guide surface of the cam 11 cooperates with the guide roller 9 of the shoe support base 29 to form a guiding mechanism. The other side of the cam 11 is limited by a cam guide bracket 7. A pull rod 3 is hinged to the left end of the spreader 2. The pull rod 3 passes through the frame 31 and the shoe support base 29. The shoe support base 29 is a fixed plate with a slotted hole to prevent the pull rod 3 from contacting the fixed plate during operation. The other end of the pull rod 3 is spherically hinged to a last-pulling hook 28, which is an adjustable-length last-pulling hook. A reverse adjusting nut is threaded into the middle of the hook rod. The pull rod 3 is located below the heel support 19. This design allows the pull hook to better pull out the shoe last.

[0051] To address the issue of better pulling out the shoe last using multiple methods, the vertically moving last-pulling mechanism includes a cam 11 fixed to the head of the cylinder piston rod 1. A flat bar 2 is fixed to the head of the cylinder piston 1, and the right end of the flat bar 2 is fixed to the cam 11 via a cam support 5. The guide surface 111 of the cam 11 cooperates with the guide roller 9 of the shoe support base 29 to form a guiding mechanism. The cam 11 is hinged to the last-pulling hook 28. This provides another technical solution for better pulling out the shoe last using the hook.

[0052] Simultaneously, the horizontal servo electric actuator is controlled to move its telescopic head according to the movement curve trajectory of the last-pulling hook, which is decomposed into a horizontal movement trajectory, and the vertical servo electric actuator is controlled to move its telescopic head according to the movement curve trajectory of the last-pulling hook, which is decomposed into a vertical movement trajectory. This allows the hook to pull out the shoe last more effectively.

[0053] To address the lasting issue for different shoe types, the guide surface 111 of the cam 11 is shaped as an inclined surface, a convex surface, or a concave surface. The specific shape is determined according to the shoe type and the coordination between horizontal and vertical movement during lasting.

[0054] To further refine the drawing curve, the height of cam 11 can be adjusted when necessary to change the drawing curve. A lifting adjustment component is provided between cam 11 and the head of cylinder piston 1. This component includes a cam support 5, which is sleeved on the cam connecting rod 51 at the lower part of cam 11. An adjusting locking bolt 6 is provided between the cam support 5 and the cam connecting rod 51 to adjust the distance between cam 11 and the head of cylinder piston 1. This also facilitates cam replacement.

[0055] To secure shoes of different sizes, a horizontal adjustment component is provided between the heel support rod 15 and the heel support 19. The horizontal adjustment component consists of a heel support adjustment sleeve 18 fixed to the upper end of the heel support rod 15, a heel support adjustment shaft 17 fixed to the heel support 19, and the heel support adjustment sleeve 18 fitted over the heel support adjustment shaft 17. A locking bolt 26 is provided between the heel support adjustment sleeve 18 and the heel support adjustment shaft 17, and a tightening wrench 21 is provided on the locking bolt 26. By adjusting the distance between the heel support and the toe cap, different shoe sizes can be secured.

[0056] To secure shoes of different sizes, a horizontal adjustment mechanism is provided between the toe support support rod 27 and the toe support 24. This mechanism consists of a toe support adjustment sleeve 25 fixed to the upper end of the toe support support column 22, a toe support adjustment shaft 22 fixed to the toe support 24, the toe support adjustment sleeve 25 fitted over the toe support adjustment shaft 22, and a locking bolt 26 between the toe support adjustment sleeve 25 and the toe support adjustment shaft 22. A tightening wrench 21 is mounted on the locking bolt 26. Adjusting the distance between the toe support and the heel support in this way allows for the securing of shoes of different sizes.

[0057] To secure shoes of different sizes, a horizontal adjustment component is provided between the toe support rod 27 and the toe support 24, and a horizontal adjustment component is provided between the heel support rod 15 and the heel support 19. By simultaneously adjusting the distance between the toe support and the heel support to achieve the required spacing, different shoe sizes can be secured.

[0058] The pneumatically controlled pneumatic transmission last-pulling machine of the present invention is composed of, for example... Figure 1-3 The frame 31, standard cylinder 200, starting device 300, sliding device 400, cam 11, last-pulling hook 28, toe support 24, and heel support 19 shown are... Figure 2 The pneumatic system shown is as follows. The frame 31 supports all components of the shoe laster and forms the hardware foundation of the entire machine. The standard cylinder 200 is a standard component purchased from the market and provides power for the last-pulling action. The sliding device 400 consists of linear bearings, a linear fixed guide rail, and ball bearing sliders 30. Driven by the cylinder and the horizontal force generated by the up-and-down movement of the cam 11, the sliding device 400 moves back and forth along the fixed guide rail, thereby changing the distance between the toe support 24 and the heel support 19 relative to the last-pulling hook 28. The cam 11 moves up and down under the drive of the cylinder, thus decomposing the cylinder's force into vertical and horizontal forces. The vertical force pulls the shoe last lever, causing it to detach from the shoe last body; the horizontal force changes the distance between the front support component supporting the shoe toe and the rear support component supporting the shoe heel. The combined action of these two directions is the last-pulling action, pulling the shoe last out of the shoe. The function of the last-pulling hook 28 is to hook the movable part of the shoe last, pulling it out of the shoe to create space so that the shoe last can be smoothly removed from the shoe later. The length of the last-pulling hook 28 is adjustable, and its lower end is fixed in a universal joint, allowing it to swing within a certain range without breaking. The toe support 24 is a support component that holds the front part of the shoe. Its vertical and horizontal position can be adjusted along the fixed post to accommodate various last shapes and sizes. After adjustment, it is locked in place with a locking screw. The fixed post of the toe support 24 is fixed to the ball bearing slider 30. The heel support 19 is a support component that holds the heel of the shoe. Its vertical and horizontal position can be adjusted along the fixed post to accommodate various last shapes and sizes. After adjustment, it is locked in place with a locking screw. The fixed post of the heel support 19 is also fixed to the ball bearing slider 30.

[0059] The following are the complete steps of this invention:

[0060] The general process flow of a cold-bonded shoe assembly line is as follows: Pairing shoes, installing the upper → Sealing the upper with glue → Softening (installing the toe cap) → Sewing the toe cap → Softening and installing the main heel → Pre-forming the heel counter → Nailing the insole (attaching the insole to the shoe last) → Applying glue and drying → Softening the toe and stretching the forefoot → Toe shaping → Positioning and drying → Stretching the heel and waist → Lasting and finishing → Semi-inspection and heat setting → Nail removal → Cleaning → Applying expansion agent → Polishing with putty → Spraying filler → Spraying all-over gloss agent → Spraying toe and tail gloss agent → Polishing with filler wax → Polishing with polishing wax → Uppering The process involves several steps: sole roughening → upper roughening → sanding and polishing → spraying outsole treatment agent → spraying upper treatment agent → drying → spraying one coat of outsole glue → spraying one coat of upper glue → drying → spraying two coats of outsole glue → spraying two coats of upper glue → drying → attaching the sole → first pressing → quality control and glue application → second pressing → applying glue → cold setting → lasting → quality control and glue separation → finishing → placing insoles → placing shoe trees → outsole finishing and drying → polishing → re-inspection → lacing shoes and placing desiccant → applying hand feel agent and boxing → labeling → packing and warehousing. The lasting process requires a lasting machine, which is described in detail below.

[0061] When lasting is needed, place the shoe with the last facing up and the front facing down on the lasting machine, with the front of the shoe placed on top. Figure 1 The toe cap is on the 24, and the heel of the shoe is placed on it. Figure 1 On the heel support 19, if the position is not suitable, both the front and back supports can be adjusted forward and backward, and up and down. Hook the last pull hook onto the shoe last movable block. If the hook position is not suitable, adjust the length of the last pull hook. If there are no problems, proceed to the next step. Push with your knee. Figure 1 The starting device 300, Figure 2 The foot pedal valve on the device switches at 4000. Figure 2 The two-position five-way air-controlled delayed reversing valve 5000 reverses, and compressed air immediately enters the upper chamber of the standard cylinder 200 through the one-way speed control valve B7000. The compressed air pushes the piston of the cylinder downward. The air in the lower part of the cylinder is discharged through the exhaust ports of the one-way speed control valve A6000 and the two-position five-way delayed reversing valve 5000. The cylinder piston and the upper piston rod are integrated. The piston rod moves downward along with the cam 11 and the last-pulling hook 28 through the connecting bracket, pulling the shoe last out of the shoe. Release the knee. Figure 2 When the foot pedal valve 4000 resets, compressed air, after a delay via the two-position five-way pneumatic delay directional valve 5000, passes through valve 5000 and one-way speed control valve A6000 into the lower chamber of cylinder 200. The piston of cylinder 200 drives the piston rod to move upward, and the air in the upper part of cylinder 200 is discharged through the exhaust ports of one-way speed control valve B7000 and the two-position five-way pneumatic delay directional valve 5000. Figure 1The piston 1 of the upper cylinder moves upwards via the connecting bracket, simultaneously moving the cam 11 and the last-pulling hook 28. It stops at the top, completing one full last-pulling action and preparing for the next operation. If the next last-pulling is not needed at that time, then... Figure 1 The upper last hook 28, toe support 24, and heel support 19 remain in their initial positions. Figure 2 The delay time of the two-position five-way pneumatic delay reversing valve 5000 can be adjusted by the speed control knob on the right end of the reversing valve 5000. The one-way speed control valves A6000 and B7000 respectively adjust the descent and ascent speeds of the cylinder 200, cam 11, and pull hook 28. Figure 2 The pulling force of cylinder 200 is adjusted by a pneumatic triplet.

[0062] The working process of this invention is as follows: When lasting is required, place the shoe with the last facing up and down on the lasting machine, with the front of the shoe on the toe support and the heel on the heel support. If the position is not suitable, the toe support and heel support can be adjusted forward and backward, up and down. Hook the lasting hook onto the last's movable block. If the hook position is not suitable, the length of the lasting hook can be adjusted. If there is no problem, proceed to the next step. When the cylinder is filled with air, the cylinder piston moves downward, driving the pull rod 3 and the cam support 5 to move downward. The pull rod 3 pulls the lasting hook 28 through the universal joint composed of the spherical connecting sleeve 12 and the spherical connecting head 13, pulling the lasting hook 28 downward and detaching it from the shoe. At the same time, the cam support 5, with the pin C6, slides along the long hole at the bottom of the cam 11 to the bottom of the long hole. At this time, the last's movable block has been pulled out. The cam support 5 continues to move downwards and drives the cam 11 downwards via pin C6. The inclined surface of the cam 11 pushes the guide roller 9, which is fixed to the guide roller 9 and the cam bracket F10 by pin D8. The cam bracket F10 is fixed to the shoe support base 29. The guide roller 9 pushes the shoe support base 29 to the left, and the heel support rod 15 and the toe support rod 27, which are fixed to the shoe support base 29, move to the left simultaneously, pulling the shoe out of the shoe last. The shoe support base 29 is fixed to the ball bearing slider 30. The support column is rectangular, and its four corners are fixed to four ball bearing sliders 30. The ball bearing sliders 30 slide on the optical axis track 4, which is fixed to the worktable 31. After the shoe lasting is completed, air enters the cylinder chamber at the other end of the cylinder piston 1, and the cylinder piston 1 moves upward. The flat bar 2 moves upward, the pull rod 3 moves upward, the lasting hook 28 moves upward, the cam support 5 moves upward, the pin C6 moves upward, and the pin C6 drives the cam 11 to move upward. The shoe base 29 is driven to reset by the tension of the tension return spring 32. One end of the tension return spring is fixed on the side of the left ball slider, and the other end is fixed on the right side of the worktable 31. Thus, one work cycle is completed.

Claims

1. A pneumatic last-pulling method, comprising the following steps: ① Fix the shoes to be lasted onto the shoe rack on the machine frame using the existing method; ② Determine the movement curve trajectory of the last-pulling hook relative to the shoe model to be lasted; ③ The movement trajectory of the last-pulling hook relative to the shoe to be lasted is decomposed into a horizontal movement trajectory and a vertical movement trajectory; ④ Set up a horizontal moving mechanism for the shoe support to be fixed and pulled. When working, the horizontal moving mechanism of the shoe support moves according to the moving curve trajectory of the pulling hook. ⑤ Set up a vertical movement mechanism for the shoe last pull hook, so that when working, the vertical movement mechanism of the shoe last pull hook moves according to the movement curve trajectory of the shoe last pull hook, which is decomposed into a vertical movement trajectory. ⑥ During operation, the horizontal moving mechanism of the shoe last and the vertical moving mechanism of the last-pulling hook start moving and stop moving at the same time. This makes the horizontal moving trajectory of the shoe last and the vertical moving trajectory of the last-pulling hook combined into the moving curve trajectory of the last-pulling hook relative to the shoe of the model to be lasted, thus removing the shoe last from the shoe. ⑦ Disconnect the last hook from the shoe last and remove the shoe from the shoe support, then repeat the above steps.

2. The pneumatic last-pulling method according to claim 1, characterized in that: In step ⑥, a reciprocating cam mechanism is set between the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook. The reciprocating cam mechanism makes the horizontal moving trajectory of the shoe support horizontal moving mechanism and the vertical moving trajectory of the last-pulling hook vertical moving mechanism combine to form the moving curve trajectory of the last-pulling hook relative to the shoe of the last-pulling model.

3. The pneumatic last-pulling method according to claim 2, characterized in that: The reciprocating cam mechanism causes the shoe support horizontal movement mechanism to move horizontally and the last-pulling hook vertical movement mechanism to move vertically. The vertical movement mechanism of the last-pulling hook is fixed with a cam, and the shoe support horizontal movement mechanism is equipped with rollers. The cam fixed in the vertical movement mechanism acts as a driving element, driving the rollers in the shoe support horizontal movement mechanism to move horizontally as a driven element.

4. The pneumatic last-pulling method according to claim 3, characterized in that: The contour line of the contact surface between the cam and the roller is the moving curve trajectory of the lasting hook of the shoe model to be lasted relative to the shoe model to be lasted. Different moving curve trajectories correspond to different shoe models.

5. The pneumatic last-pulling method according to claim 1, characterized in that: Step ④ sets up a horizontal moving mechanism for fixing the shoe upper of the shoe to be lasted. When working, the horizontal moving mechanism of the shoe upper moves according to the moving curve trajectory of the last-lasting hook, which is decomposed into a horizontal moving trajectory. The horizontal moving mechanism of the shoe upper is connected to the telescopic head of the horizontal servo telescopic mechanism, and the horizontal servo telescopic mechanism is controlled to make its telescopic head move according to the moving curve trajectory of the last-lasting hook, which is decomposed into a horizontal moving trajectory. Step ⑤ sets up a vertical moving mechanism for the shoe last pull hook. When working, the vertical moving mechanism of the pull hook moves according to the moving curve trajectory of the pull hook, which is decomposed into a vertical moving trajectory. The telescopic head of the vertical servo telescopic mechanism is connected to the pull hook. The vertical servo telescopic mechanism is controlled to make its telescopic head move according to the moving curve trajectory of the pull hook, which is decomposed into a vertical moving trajectory. In step ⑥, the horizontal moving mechanism of the shoe support and the vertical moving mechanism of the last-pulling hook start and stop moving simultaneously. This allows the horizontal moving trajectory of the shoe support to be combined with the vertical moving trajectory of the last-pulling hook to form the moving curve trajectory of the last-pulling hook relative to the shoe model to be lasted. This is achieved by simultaneously controlling the horizontal servo telescopic mechanism to move its telescopic head according to the moving curve trajectory of the last-pulling hook, which is decomposed into a horizontal moving trajectory, and the vertical servo telescopic mechanism to move its telescopic head according to the moving curve trajectory of the last-pulling hook, which is decomposed into a vertical moving trajectory.

6. The pneumatic last-pulling method according to claim 5, characterized in that: The horizontal servo telescopic mechanism is a horizontal servo electric telescopic rod, and the vertical servo telescopic mechanism is a vertical servo electric telescopic rod.

7. The pneumatic last-pulling method according to claim 5, characterized in that: The horizontal servo telescopic mechanism is a horizontal servo hydraulic rod, and the vertical servo telescopic mechanism is a vertical servo hydraulic rod.

8. A pneumatic last-pulling method according to claim 5, characterized in that: The horizontal servo telescopic mechanism is a horizontal servo pneumatic rod, and the vertical servo telescopic mechanism is a vertical servo pneumatic rod.

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