Corner turning equipment for costume design and production

Abstract

The invention discloses corner turning equipment for costume design and production, and relates to the technical field of costume processing equipment.The corner turning equipment comprises a fixing frame, a servo motor is arranged on the surface of the fixing frame, the corner turning equipment further comprises a corner turning device, and through the arrangement of the corner turning device, a first sliding frame and a second sliding frame move towards the two sides through rotation of a bidirectional lead screw; by means of the arrangement, the operable space is enlarged to adapt to clothes of different sizes, movement of the first sliding frame and the second sliding frame is more stable through a gear and a limiting rod, after adjustment is completed, the to-be-turned face of the clothes is fixed and then grabbed, in the initial state, a baffle protects an upper corner rod, an operator is prevented from being stabbed by the upper corner rod due to misoperation, and the practicability is high. The baffle is always moved to the non-protection area by the movable end of the telescopic rod through the first air cylinder, the upper corner rod and the telescopic rod, and after the upper corner rod makes contact with the clothes, the clothes can be turned over by turning over the clothes upwards.

Description

Technical Field

[0001] The present invention relates to the technical field of clothing processing equipment, and particularly to a corner-turning device for clothing design and production. Background Art

[0002] In traditional clothing design and production, the corner-turning process usually relies on manual operation. For example, when making the collar of a coat, it is necessary to first sew the collar, then turn the side with the stitches to make the side without stitches face outwards, and then iron and shape the collar corners. Moreover, manual operation has low efficiency, is prone to errors during collar turning, affects product quality, has low automation, cumbersome operation procedures, and it is difficult to guarantee the quality of shaping.

[0003] The patent with the patent announcement number CN217973784U relates to the technical field of clothing processing equipment. The present invention discloses a fast corner-turning tool for clothing, including a base fixedly arranged on a workbench. The base is a rectangular metal plate. A corner-turning bracket is arranged at one end of the base, and a support seat is arranged at the other end. A first steel rod is arranged at the upper end of the corner-turning bracket, and a second steel rod is arranged at the upper end of the support seat. The second steel rod is hinged to the support seat, and a spring reset device is connected between the base and the second steel rod; one end of this patent is provided with a fixed steel rod with a corner, and the other end is provided with a rotatable steel rod. A spring reset device is arranged between the rotatable steel rod and the base, which can automatically reset after the rotatable steel rod rotates, saving the harm to the body caused by manual reset.

[0004] In the above patent, it can automatically reset after the rotatable steel rod rotates, saving the harm to the body caused by manual reset. However, the current equipment has the following problems: If the upper corner plate is not protected against accidental injury, the operator may be injured, such as scratched or cut, during the operation due to accidental contact with the upper corner plate, increasing the safety risk. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a corner-turning device for clothing design and production, which solves the problems raised in the above background art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a corner turning device for clothing design and production, comprising a fixed frame, the fixed frame, the surface of which is provided with a servo motor, and also comprising a corner turning device; wherein the corner turning device comprises a bidirectional screw, a sliding frame, a cylinder, an upper corner rod, a baffle, a telescopic rod, a gear and a limit rod, the bidirectional screw is rotatably mounted on the inner wall of the fixed frame, the bidirectional screw is transmission-connected to the output end of the servo motor through a No. 1 belt, the sliding frame is threadedly mounted on the circumferential surface of the bidirectional screw, the fixed end of the cylinder is fixedly mounted on the inner wall of the sliding frame, the upper corner rod One side is fixedly mounted on the output end of the cylinder one, the baffle is rotatably mounted on the surface of the sliding frame one, a torsion spring No. 1 is arranged between the baffle and the sliding frame one, and the baffle is driven to reset by the torsion spring No. 1, the fixed end of the telescopic rod is fixedly mounted on the inner wall of the sliding frame one, the other side of the upper angle rod is fixedly mounted on the movable end of the telescopic rod, the gear is fixedly mounted on the surface of the bidirectional screw rod, and the limit rod is slidably mounted on the surface of the fixed frame. In the initial state, the baffle protects the upper angle rod to prevent the operator from being stabbed by the upper angle rod due to operating errors. In the moving state, the baffle is always moved to the non-protected area by the movable end of the telescopic rod; Wherein, a switching device for turning the corners of different garments and an auxiliary device for assisting the operation of the switched corner turning device are arranged in the middle of the fixing frame.

[0007] According to the above technical solution, the top of the limit rod is set to be an arc shape, and the rotation of the gear will contact the arc surface of the limit rod, causing the limit rod to move downward and stretch the No. 1 spring at the same time. In this way, the movement of sliding frame one and sliding frame two is more stable. A No. 1 spring is arranged between the limit rod and the fixed frame, and the limit rod is reset by the arranged No. 1 spring.

[0008] According to the above technical solution, the angle turning device includes a second cylinder and a second sliding frame. The fixed end of the second cylinder is fixedly mounted on the surface of the first sliding frame. The second sliding frame is threadedly mounted on the circumferential surface of the bidirectional screw. The first belt is driven by a servo motor to drive the bidirectional screw to rotate. The rotation of the bidirectional screw causes the first sliding frame and the second sliding frame to move to both sides.

[0009] According to the above technical solution, the switching device includes a rotating frame, an auxiliary rod and an auxiliary angle. The rotating frame is rotatably installed on the inner wall of the sliding frame 2, the auxiliary rod is rotatably installed on the inner wall of the rotating frame, and the auxiliary angle is fixedly installed on the surface of the auxiliary rod. A No. 2 torsion spring is arranged between the auxiliary rod and the rotating frame. The auxiliary rod is driven to reset by the arranged No. 2 torsion spring. After the insertion rod for preventing the T-shaped rod from being accidentally touched is moved upward, the T-shaped rod can be moved forward to drive the round groove button to move. The movement of the round groove button releases the compressed No. 2 torsion spring and drives the auxiliary rods on both sides to rotate outward.

[0010] According to the above technical solution, the switching device further includes a chute plate, a round groove button, a T-shaped rod and a plug rod. The chute plate is fixedly installed on the inner wall of the rotating frame. The round groove button is slidably installed on the inner wall of the chute plate. The T-shaped rod is fixedly installed on the front side of the round groove button. The plug rod is slidably installed on the inner wall of the chute plate. A second spring is arranged between the plug rod and the chute plate. The second spring drives the plug rod to reset. When storing the auxiliary rod, after resetting it, it is limited by the round groove button.

[0011] According to the above technical solution, the switching device further includes a clamping block and a support frame. The clamping block is fixedly installed on the surface of the auxiliary rod. The support frame is fixedly installed on the circumferential surface of the rotating frame. The clamping block is driven to rotate by rotating the rotating frame.

[0012] According to the above technical solution, the auxiliary device includes a hollow rod, an inclined block rod and a third spring. The hollow rod is fixedly installed on the right side of the rotating frame. The inclined block rod is slidably installed on the inner wall of the hollow rod. The third spring is arranged between the hollow rod and the inclined block rod. The third spring drives the inclined block rod to reset. When the clamping block moves and contacts the inclined surface of the inclined block rod, the inclined block rod moves to the right and compresses the third spring at the same time. When the clamping block and the inclined block rod are on the same horizontal plane, the third spring resets to drive the inclined block rod to insert into the clamping block to complete the fixation of the rotating frame.

[0013] According to the above technical solution, the auxiliary device further includes a placement rack, a connecting rack, a pressing plate and a fourth spring. The placement rack is fixedly installed on the front side of the support frame. The connecting rack is fixedly installed on the rear side of the placement rack. The pressing plate is slidably installed on the circumferential surface of the connecting rack. The fourth spring is arranged between the pressing plate and the connecting rack. The fourth spring drives the pressing plate to reset. When the support frame moves, the placement rack moves. By pulling the pressing plate outwards, a corner of the clothing is stuck at the pressing plate, so that both sides of the clothing are fixed. At this time, the output end of the second cylinder extends downwards to contact the corner, causing the clothing to be flipped.

[0014] The present invention provides a corner-flipping device for clothing design and production. It has the following beneficial effects: (1) In this invention, through the setting of the corner-flipping device, the sliding frame one and the sliding frame two move towards both sides by the rotation of the bidirectional lead screw, so that the operable space becomes larger to adapt to clothing of different sizes. Through the gears and the limiting rods, the movement of the sliding frame one and the sliding frame two is more stable. After the adjustment is completed, after fixing the surface of the clothing to be flipped and then grasping it. In the initial state, the baffle protects the upper corner rod to prevent the operator from being stabbed by the upper corner rod due to an operation error. Through the first cylinder, the upper corner rod and the telescopic rod, the baffle is always moved by the movable end of the telescopic rod to a non-protective area. After the upper corner rod contacts the clothing, the clothing can be flipped upwards to flip the corner of the clothing.

[0015] (2) The invention, through the setting of the switching device, places the garment to be turned at the tip of the second sliding frame before turning the corner, and prevents the T-shaped rod from being touched by mistake by means of the insertion rod. When the turning corner is large, the auxiliary rods on both sides are rotated outwards by means of the T-shaped rod and the round groove button, thereby improving the efficiency of turning the corner by expanding the contact area with the garment. When the auxiliary rod is stored, it is reset and then limited by the round groove button. The support of the auxiliary rod can make the fabric more evenly stressed during the turning process, thereby avoiding deformation or wrinkling of the fabric due to excessive local stress, and ensuring that the surface of the fabric after turning the corner is flat and smooth.

[0016] (3) This invention, through the setting of auxiliary devices, when it is necessary to switch the corner turning operation, the fixing of the rotating frame is completed by the clamping block, the inclined block rod, and the No. 3 spring. At this time, the support frame replaces the rotating frame and is in the waiting area. By pulling the pressure plate outward, a corner of the clothing is clamped on the pressure plate, so that the two sides of the clothing are fixed. At this time, the output end of the cylinder 2 extends downward to contact the corner so that the clothing is turned over, and the two sides of the fabric are tightly pressed so that it will not slide at will when folding, thereby ensuring the accuracy of the position and shape of the corner turning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the position structure of the gear and the limit rod of the present invention; Figure 3 This is a schematic diagram of the position structure of the baffle and the upper corner rod of the present invention; Figure 4 It is a schematic diagram of the structure of the rotating frame and the sliding frame in two positions of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure enlargement of part A; Figure 6 This is a schematic diagram of the auxiliary rod and the block position structure of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the structure of part B in the middle is enlarged; Figure 8 It is a schematic diagram of the support frame and the pressure plate position structure of the present invention.

[0018] In the figure: 1. fixed frame; 2. two-way screw rod; 3. sliding frame 1; 4. cylinder 1; 5. upper angle rod; 6. baffle; 7. telescopic rod; 8. brake rod; 9. gear; 10. limit rod; 11. cylinder 2; 12. sliding frame 2; 20. rotating frame; 21. auxiliary rod; 22. auxiliary angle; 23. slide plate; 24. round groove button; 25. T-shaped rod; 26. insertion rod; 27. block; 28. support frame; 30. hollow rod; 31. inclined block rod; 32. spring No. 3; 33. placement frame; 34. connecting frame; 35. pressure plate; 36. spring No. 4. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figures 1 - 3 , one embodiment of the present invention is: a corner turning device for clothing design and production, comprising a fixed frame 1, a fixed frame 1, a servo motor is arranged on the surface of the fixed frame 1, and also comprises a corner turning device; wherein the corner turning device comprises a bidirectional screw rod 2, a sliding frame 3, a cylinder 4, an upper angle rod 5, a baffle 6, a telescopic rod 7, a gear 9 and a limit rod 10, the bidirectional screw rod 2 is rotatably mounted on the inner wall of the fixed frame 1, the bidirectional screw rod 2 is transmission-connected with the output end of the servo motor through a No. 1 belt, the sliding frame 3 is threadedly mounted on the circumferential surface of the bidirectional screw rod 2, so that the operable space becomes larger to adapt to clothing of different sizes, and the fixed end of the cylinder 4 is fixed The upper angle rod 5 is fixedly mounted on the inner wall of the sliding frame 3, one side of the upper angle rod 5 is fixedly mounted on the output end of the cylinder 4, and the baffle 6 is rotatably mounted on the surface of the sliding frame 3. In the initial state, the baffle 6 protects the upper angle rod 5 to prevent the operator from being stabbed by the upper angle rod 5 due to operating errors. A torsion spring No. 1 is arranged between the baffle 6 and the sliding frame 3, and the baffle 6 is reset by the torsion spring No. 1. The fixed end of the telescopic rod 7 is fixedly mounted on the inner wall of the sliding frame 3, and the other side of the upper angle rod 5 is fixedly mounted on the movable end of the telescopic rod 7. The gear 9 is fixedly mounted on the surface of the bidirectional screw rod 2, and the limit rod 10 is slidably mounted on the surface of the fixed frame 1; The top of the limiting rod 10 is set to be an arc shape, and a No. 1 spring is arranged between the limiting rod 10 and the fixing frame 1, and the limiting rod 10 is driven to reset by the arranged No. 1 spring.

[0021] The angle turning device includes a cylinder 11 and a sliding frame 12. The fixed end of the cylinder 11 is fixedly mounted on the surface of the sliding frame 3. The sliding frame 12 is threadedly mounted on the circumferential surface of the bidirectional screw rod 2. The rotation of the bidirectional screw rod 2 causes the sliding frame 3 and the sliding frame 12 to move to both sides.

[0022] When the present embodiment is working, the servo motor drives the first belt to drive the bidirectional screw rod 2 to rotate. The rotation of the bidirectional screw rod 2 causes the sliding frame 1 3 and the sliding frame 2 12 to move to both sides, so that the operable space becomes larger to accommodate clothes of different sizes. When the bidirectional screw rod 2 rotates, it drives the gear 9 to rotate. The rotation of the gear 9 will contact the arc surface of the limit rod 10, so that the limit rod 10 moves downward and stretches the first spring at the same time. In this way, the movement of the sliding frame 1 3 and the sliding frame 2 12 is more stable. After the adjustment is completed, the angle surface of the clothing to be turned is fixed After completion, the upper corner rod 5 is grasped and driven to move downward by the output end of the cylinder 4. The movement of the upper corner rod 5 drives the movable end of the telescopic rod 7 to stretch. The movable end of the telescopic rod 7 moves and contacts with the baffle 6, causing the baffle 6 to rotate downward and compress the No. 1 torsion spring. In the initial state, the baffle 6 protects the upper corner rod 5 to prevent the operator from being stabbed by the upper corner rod 5 due to operating errors. In the moving state, the baffle 6 is always moved to the non-protected area by the movable end of the telescopic rod 7. After the upper corner rod 5 contacts the clothes, the clothes can be flipped up by flipping them upwards.

[0023] See also Figures 1 - 8 On the basis of the above embodiment, in another embodiment of the present invention, a switching device for turning corners of different garments and an auxiliary device for assisting the operation of the turned corner device after switching are provided in the middle of the fixed frame 1, the switching device comprises a rotating frame 20, an auxiliary rod 21 and an auxiliary angle 22, the rotating frame 20 is rotatably mounted on the inner wall of the sliding frame 12, the auxiliary rod 21 is rotatably mounted on the inner wall of the rotating frame 20, the auxiliary angle 22 is fixedly mounted on the surface of the auxiliary rod 21, a second torsion spring is provided between the auxiliary rod 21 and the rotating frame 20, the auxiliary rod 21 is driven to reset by the provided second torsion spring, the efficiency of the turned corner is improved by expanding the contact area with the garment, the support of the auxiliary rod 21 can make the cloth be subjected to more uniform force during the turned corner process, avoid deformation or wrinkling of the cloth due to excessive local force, and ensure that the surface of the cloth after the turned corner is flat and smooth.

[0024] The switching device also includes a slide plate 23, a round groove button 24, a T-shaped rod 25 and an insertion rod 26. The slide plate 23 is fixedly installed on the inner wall of the rotating frame 20, the round groove button 24 is slidably installed on the inner wall of the slide plate 23, the T-shaped rod 25 is fixedly installed on the front side of the round groove button 24, and the insertion rod 26 is slidably installed on the inner wall of the slide plate 23. A No. 2 spring is arranged between the insertion rod 26 and the slide plate 23. The insertion rod 26 is reset by the arranged No. 2 spring, and the T-shaped rod 25 is prevented from being accidentally touched by the insertion rod 26.

[0025] The switching device also includes a block 27 and a support frame 28. The block 27 is fixedly mounted on the surface of the auxiliary rod 21, and the support frame 28 is fixedly mounted on the circumferential surface of the rotating frame 20. The efficiency of turning the corners of different garments can be improved by switching the turning corners.

[0026] The auxiliary device includes a hollow rod 30, an inclined block rod 31 and a No. 3 spring 32. The hollow rod 30 is fixedly installed on the right side of the rotating frame 20, the inclined block rod 31 is slidably installed on the inner wall of the hollow rod 30, and the No. 3 spring 32 is arranged between the hollow rod 30 and the inclined block rod 31. The inclined block rod 31 is reset by the arranged No. 3 spring 32 to complete the fixation of the rotating frame 20.

[0027] The auxiliary device also includes a placing frame 33, a connecting frame 34, a pressing plate 35 and a No. 4 spring 36. The placing frame 33 is fixedly installed on the front side of the supporting frame 28, the connecting frame 34 is fixedly installed on the rear side of the placing frame 33, the pressing plate 35 is slidably installed on the circumferential surface of the connecting frame 34, and the No. 4 spring 36 is arranged between the pressing plate 35 and the connecting frame 34. The No. 4 spring 36 drives the pressing plate 35 to reset, so that the two sides of the clothing are fixed. At this time, the output end of the cylinder 2 11 extends downward to contact the corners so that the clothing is flipped, and the two sides of the cloth are tightly pressed so that it will not slide at will when folded, thereby ensuring the accuracy of the position and shape of the flipped corners.

[0028] When the present embodiment is working, the movement of the sliding frame 21 drives the rotating frame 20 to move, and the rotation of the rotating frame 20 drives the supporting frame 28 to move, and the clothing to be turned corner is placed at the tip of the sliding frame 21 to turn the corner. When the turning corner is large, the T-shaped rod 25 can be moved forward to drive the round groove button 24 to move after the insertion rod 26 for preventing accidental touch is moved upward. The movement of the round groove button 24 releases the compressed No. 2 torsion spring and drives the auxiliary rods 21 on both sides to rotate outward. The movement of the auxiliary rod 21 drives the auxiliary angle 22 and the card block 27 to move at the same time, and the efficiency of turning the corner is improved by expanding the contact area with the clothing. When the auxiliary rod 21 is stored, it is reset and limited by the round groove button 24. The support of the auxiliary rod 21 can make the cloth more evenly stressed during the turning corner, avoid deformation or wrinkling of the cloth due to excessive local stress, and ensure that the surface of the cloth after turning the corner is flat and smooth. When it is necessary to switch the corner turning operation, the rotating frame 20 is driven to rotate the clamping block 27, and the clamping block 27 moves to contact the inclined surface of the inclined block rod 31, so that the inclined block rod 31 moves to the right and compresses the No. 3 spring 32. When the clamping block 27 and the inclined block rod 31 are in the same horizontal plane, the No. 3 spring 32 is reset to drive the inclined block rod 31 to insert into the clamping block 27 to complete the fixation of the rotating frame 20. At this time, the support frame 28 replaces the rotating frame 20 in the waiting area. The movement of the support frame 28 drives the placement frame 33 to move, and the pressing plate 35 is pulled outward so that a corner of the clothing is stuck at the pressing plate 35, so that the two sides of the clothing are fixed. At this time, the output end of the cylinder 2 11 extends downward to contact the corner so that the clothing is turned over, and the two sides of the cloth are tightly pressed so that it will not slide at will when folding, thereby ensuring the accurate position and shape of the turning angle.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turning angle device for clothing design and production, comprising a fixed frame (1), characterized in that: The fixing frame (1), on the surface of the fixing frame (1) is provided with a servo motor, and further includes a corner turning device; Wherein, the corner turning device includes a bidirectional lead screw (2), a first sliding frame (3), a first cylinder (4), an upper corner rod (5), a baffle (6), a telescopic rod (7), a gear (9) and a limiting rod (10). The bidirectional lead screw (2) is rotatably installed on the inner wall of the fixing frame (1), the bidirectional lead screw (2) is in transmission connection with the output end of the servo motor through a first belt, the first sliding frame (3) is threadedly installed on the circumferential surface of the bidirectional lead screw (2), the fixed end of the first cylinder (4) is fixedly installed on the inner wall of the first sliding frame (3), one side of the upper corner rod (5) is fixedly installed on the output end of the first cylinder (4), the baffle (6) is rotatably installed on the surface of the first sliding frame (3), a first torsion spring is arranged between the baffle (6) and the first sliding frame (3), the fixed end of the telescopic rod (7) is fixedly installed on the inner wall of the first sliding frame (3), the other side of the upper corner rod (5) is fixedly installed on the movable end of the telescopic rod (7), the gear (9) is fixedly installed on the surface of the bidirectional lead screw (2), and the limiting rod (10) is slidably installed on the surface of the fixing frame (1); Wherein, in the middle of the fixing frame (1) is provided with a switching device for turning the corners of different clothes and an auxiliary device for assisting the operation of the corner turning device after switching.

2. The turning angle device for clothing design and production according to claim 1, characterized in that: The top of the limiting rod (10) is arc-shaped, and a first spring is arranged between the limiting rod (10) and the fixing frame (1).

3. A corner-turning device for clothing design and production according to claim 2, characterized in that: The corner turning device includes a second cylinder (11) and a second sliding frame (12). The fixed end of the second cylinder (11) is fixedly installed on the surface of the first sliding frame (3), and the second sliding frame (12) is threadedly installed on the circumferential surface of the bidirectional lead screw (2).

4. A corner-turning device for clothing design and production according to claim 3, characterized in that: The switching device includes a rotating frame (20), an auxiliary rod (21) and an auxiliary angle (22). The rotating frame (20) is rotatably installed on the inner wall of the second sliding frame (12), the auxiliary rod (21) is rotatably installed on the inner wall of the rotating frame (20), the auxiliary angle (22) is fixedly installed on the surface of the auxiliary rod (21), and a second torsion spring is arranged between the auxiliary rod (21) and the rotating frame (20).

5. A corner-turning device for clothing design and production according to claim 4, characterized in that: The switching device further includes a chute plate (23), a round groove button (24), a T-shaped rod (25) and a plug rod (26). The chute plate (23) is fixedly installed on the inner wall of the rotating frame (20), the round groove button (24) is slidably installed on the inner wall of the chute plate (23), the T-shaped rod (25) is fixedly installed on the front side of the round groove button (24), the plug rod (26) is slidably installed on the inner wall of the chute plate (23), and a second spring is arranged between the plug rod (26) and the chute plate (23).

6. The corner-turning device for clothing design and production according to claim 5, characterized in that: The switching device further includes a clamping block (27) and a support frame (28). The clamping block (27) is fixedly installed on the surface of the auxiliary rod (21), and the support frame (28) is fixedly installed on the circumferential surface of the rotating frame (20).

7. A corner-turning device for clothing design and production according to claim 6, characterized in that: The auxiliary device includes a hollow rod (30), an inclined block rod (31) and a third spring (32). The hollow rod (30) is fixedly installed on the right side of the rotating frame (20). The inclined block rod (31) is slidably installed on the inner wall of the hollow rod (30). The third spring (32) is arranged between the hollow rod (30) and the inclined block rod (31).

8. A turning angle device for clothing design and production according to claim 7, characterized in that: The auxiliary device further includes a placement rack (33), a connecting rack (34), a pressing plate (35) and a fourth spring (36). The placement rack (33) is fixedly installed on the front side of the support frame (28). The connecting rack (34) is fixedly installed on the rear side of the placement rack (33). The pressing plate (35) is slidably installed on the circumferential surface of the connecting rack (34). The fourth spring (36) is arranged between the pressing plate (35) and the connecting rack (34).

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