Code disc machine without stretching and inserting motor

Abstract

The invention relates to the field of logistics, in particular to an extension-insertion-free motor code disc machine which comprises a supporting frame, a lifting mechanism is arranged on the supporting frame, a plurality of fork foot structures are fixed to the lifting mechanism, each fork foot structure comprises a fixing plate fixedly connected with the lifting mechanism, a U-shaped block is fixed to the bottom face of the fixing plate, and a rotating rod is rotationally connected to the U-shaped block. Through the arrangement of the fork foot structure, a stretching and inserting motor does not need to be arranged, on one hand, the cost is greatly reduced, on the other hand, the time needed by starting of the stretching and inserting motor and stretching and contracting of the fork feet in the prior art is saved through the fork foot structure, and the disc stacking efficiency is greatly improved; in addition, the situation that two original stretching and inserting motors are not synchronous in the using process and cannot be stacked is avoided, and finally after the stretching and inserting motors are omitted, manpower and material resources needed by follow-up maintenance and maintenance of the stretching and inserting motors are greatly saved.

Description

Technical Field

[0001] The present invention relates to the field of logistics, and in particular to a motor-free encoder. Background Art

[0002] The pallet stacking machine is a device for automatically stacking pallets, which aims to improve work efficiency and the automation level of warehouse management. The pallet stacking machine collects the empty pallets on the conveyor line one by one through a mechanical device and automatically stacks them into stacks for storage or redistribution. For example, the patent with application number CN202320151583.2 discloses a stacking machine for a vertical warehouse transfer station. Although the stacking machine for a vertical warehouse transfer station can automatically stack and sort the pallets, the fork of the stacking machine needs to use an insertion motor when forking the pallet. The extension and retraction of the fork is achieved by the insertion motor. This method has the following disadvantages: 1) The use of two insertion motors greatly increases the cost; 2) The start-up of the insertion motor and the extension and retraction of the fork require a certain amount of time, which greatly reduces the efficiency of stacking; 3) The two insertion motors may be out of sync during use, which will result in the inability to stack the pallets smoothly, or even dangerous situations; 4) The subsequent maintenance and maintenance of the two insertion motors also requires a lot of manpower and material resources. Therefore, a non-extending motor encoder is urgently needed. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a palletizing machine without an extending and inserting motor, which solves the problems existing in the prior art. The present invention eliminates the extending and inserting motor and realizes the automatic forking of the pallet by the fork feet and the automatic retraction of the fork feet through the setting of freely rotatable fork feet, which greatly saves costs and also greatly improves the efficiency of stacking pallets.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a motor-free encoder, comprising a support frame, a lifting mechanism is provided on the support frame, a plurality of fork structures are fixed on the lifting mechanism, the fork structure comprises a fixed plate fixedly connected to the lifting mechanism, a U-shaped block is fixed on the bottom surface of the fixed plate, a rotating rod is rotatably connected to the U-shaped block, and forks are fixed on the rotating rod.

[0007] Preferably, the support frame includes a first support frame and a second support frame which are arranged in a bilaterally symmetrical manner. The first support frame and the second support frame are fixedly connected by a plurality of connecting rods, and shields are fixed to the outside of the first support frame and the second support frame.

[0008] Preferably, the lifting mechanism includes a motor fixed to the first supporting frame, a first sprocket is fixed on the rotating shaft of the motor, the first sprocket is connected to the second sprocket by a chain, a transmission rod is fixed through the center position of the second sprocket, the left and right ends of the transmission rod are rotatably connected to the second supporting frame and the first supporting frame respectively, a third sprocket and a fourth sprocket are fixed on the transmission rod, the first chain and the second chain are connected to the third sprocket, the upper end of the first chain bypasses the fifth sprocket and is fixed to the first lifting frame, the upper end of the second chain bypasses the fifth sprocket and the sixth sprocket and is fixed to the first lifting frame, the third chain and the fourth chain are connected to the fourth sprocket, the upper end of the third chain bypasses the seventh sprocket and is fixed to the second lifting frame, and the upper end of the fourth chain bypasses the seventh sprocket and the eighth sprocket and is fixed to the second lifting frame.

[0009] Preferably, the first lifting frame and the second lifting frame are both arranged in a transverse H-shape and are slidably connected to the first supporting frame and the second supporting frame respectively, and the fork leg structure is fixed to the first lifting frame and the second lifting frame.

[0010] Preferably, a pad is fixed on the bottom surface of the fixing plate.

[0011] Preferably, the fork leg is T-shaped, comprising a connecting portion rotatably connected to the U-shaped block, a first fork leg portion is fixed to the inner end of the connecting portion, a second fork leg portion is fixed to the inner end of the first fork leg portion, a buffer slope is provided on the bottom surface of the inner end of the second fork leg, and the buffer slope is set higher at the inner end and lower at the outer end.

[0012] Preferably, a groove is provided on the bottom surface of the first fork leg, and a plurality of connecting shafts coaxial with the rotating rod are fixed in the groove, and a plurality of rollers are rotatably connected to each connecting shaft.

[0013] Preferably, the rotating rod is arranged near the upper end of the connecting portion, and the length of the connecting portion is smaller than the length of the first fork leg.

[0014] Preferably, the pad is configured as a rubber pad having a plurality of through holes extending therethrough from top to bottom, wherein magnets are disposed in the through holes, wherein the upper ends of the magnets are fixed to the bottom surface of the fixed plate, and a gap is left between the lower ends of the magnets and the lower ends of the through holes.

[0015] (III) Beneficial effects

[0016] 1. The present invention does not need to set up an extension motor after the fork leg structure is set up, which greatly reduces the cost on the one hand, and on the other hand, the fork leg structure saves the time required for starting the extension motor and extending and contracting the fork legs, greatly improving the efficiency of stacking the discs. In addition, the original situation that the two extension motors are out of sync during use and the discs cannot be stacked will not occur. Finally, after the extension motor is eliminated, the manpower and material resources required for the subsequent maintenance and maintenance of the extension motor are greatly saved;

[0017] 2. The present invention provides a pad that, on the one hand, stops the fork legs, so that the fork legs remain horizontal when carrying the pallet, and on the other hand, provides a certain buffering effect, protecting the fixing plate and the fork legs;

[0018] 3. The present invention provides a buffer slope. When the bottom end of the buffer slope reaches the bottom of the side of the pallet, the vertical fork leg will gradually fall down due to the buffer slope during the process of the fork leg falling down, thus playing a good buffering role. If the buffer slope does not exist, the fork leg will fall down all at once once it is not blocked, and the force is relatively large, which can easily cause damage to the fork leg structure that needs to be used frequently. The buffer slope avoids this situation. In addition, the buffer slope makes the weight distribution of the first fork leg and the second fork leg uneven, so that the fork leg is more likely to fall from the vertical state to the horizontal state when it is not blocked.

[0019] 4. The present invention provides a groove and a roller on the first fork leg, which reduces the friction between the first fork leg and the side of the pallet when the first fork leg descends along the side of the pallet, so that the first fork leg can descend more smoothly, and also reduces the wear on the side of the pallet and the first fork leg. In addition, the roller generates a certain vibration when descending along the side of the pallet, and the vibration makes it easier for the subsequent fork leg to tilt from a vertical state to a horizontal state.

[0020] 5. The present invention arranges the rotating rod near the upper end of the connecting portion, and arranges the length of the connecting portion to be smaller than the length of the first fork leg. This arrangement makes the entire center of the fork leg structure tilt toward the tray, which makes it easier for the fork leg to tilt from a vertical state to a horizontal state.

[0021] 6. The present invention further plays a buffering role by setting the pad as a rubber pad, which protects the fork legs and the fixed plate. The setting of the magnet plays a role of a skeleton on the one hand, shaping the rubber pad and increasing the rigidity of the pad. On the other hand, when the fork legs rotate from a vertical direction to a horizontal direction, the magnet has an attraction on the fork legs, which greatly improves the speed of the fork legs rotating from a vertical direction to a horizontal direction while ensuring the smooth rotation of the fork legs to the horizontal direction. In addition, after the fork legs rotate to the horizontal direction, the fork legs are attracted and fixed to prevent the fork legs from rotating, thereby ensuring the smooth forking of the pallet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of the present invention.

[0023] Figure 2 It is a schematic diagram of the fork leg structure of the present invention.

[0024] Figure 3 It is an overall schematic diagram of the present invention.

[0025] Figure 4 For the present invention Figure 3 Schematic diagram after removing the cover.

[0026] Figure 5 It is a cross-sectional view of the fork leg of the present invention.

[0027] Figure 6 It is a longitudinal sectional view of the fork leg of the present invention.

[0028] Figure 7 It is a schematic diagram of the fixing plate, the backing plate and the magnet of the present invention.

[0029] In the figure: 1-support frame, 2-lifting mechanism, 3-fork foot structure, 4-fixed plate, 5-U-shaped block, 6-rotating rod, 7-fork foot, 8-first support frame, 9-second support frame, 10-connecting rod, 11-block cover, 12-motor, 13-first sprocket, 14-chain, 15-second sprocket, 16-transmission rod, 17-third sprocket, 18-fourth sprocket, 19-first chain, 20-second chain, 21-fifth sprocket, 22-first lifting frame, 23-sixth sprocket, 24-third chain, 25-fourth chain, 26-seventh sprocket, 27-second lifting frame, 28-eighth sprocket, 29-pad, 30-connecting part, 31-first fork foot, 32-second fork foot, 33-buffer slope, 34-groove, 35-connecting shaft, 36-roller, 37-through hole, 38-magnet. DETAILED DESCRIPTION

[0030] The following will be combined with the attached embodiment of the present invention Figure 1-7 The technical solutions in the embodiments of the present invention are described clearly and completely. 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.

[0031] The present invention provides a technical solution: a motor-free coder, comprising a support frame 1, a lifting mechanism 2 is arranged on the support frame 1, a plurality of fork leg structures 3 are fixed on the lifting mechanism 2, the fork leg structure 3 comprises a fixed plate 4 fixedly connected to the lifting mechanism 2, a U-shaped block 5 is fixed on the bottom surface of the fixed plate 4, a rotating rod 6 is rotatably connected to the U-shaped block 5, a fork leg 7 is fixed on the rotating rod 6, when working, the coder is matched with a conveyor, first the conveyor transfers the first pallet to the bottom of the fork leg structure 3, then the lifting mechanism 2 is started, and the fork leg structure 3 is lowered, during the process of the fork leg structure 3 being lowered, when the fork leg 7 contacts the first pallet, the fork leg 7 contacts the first pallet, and the fork leg 7 contacts the first pallet. When the fork leg 7 reaches the edge of the top of the first pallet and continues to descend, it will rotate due to the obstruction of the top of the first pallet, and the fork leg 7 will rotate from the original horizontal state to the vertical state, and move downward along the side of the first pallet. When the top of the fork leg 7 is lower than the bottom of the side of the first pallet (that is, the fork leg 7 enters the fork-taking position of the first pallet), the fork leg 7 will rotate to the horizontal position again because it is not blocked. At this time, the lifting mechanism 2 will move in the opposite direction to lift the fork leg structure 3. During the rising process of the fork leg structure 3, when the fork leg 7 contacts the bottom surface of the first pallet, it will lift the first pallet together to the specified height, that is, The conveyor will then transport the second pallet to the bottom of the first pallet, and then the lifting mechanism 2 will start to drive the first pallet on it to descend until it is stacked with the second pallet on the conveyor (the pallets can be plugged and stacked), and then the lifting mechanism 2 will drive the fork legs 7 to continue to descend. During the descent of the fork leg structure 3, when the fork legs 7 touch the edge of the top of the second pallet, it will rotate during the continued descent due to the obstruction of the top of the second pallet, and the fork legs 7 will rotate from the original horizontal state to the vertical state, and move downward along the side of the second pallet. When the top of the fork legs 7 At the moment when the fork leg 7 is lower than the bottom of the side of the second pallet (that is, the fork leg 7 enters the fork position of the second pallet), the fork leg 7 will be rotated to the horizontal position again because it is not blocked. At this time, the lifting mechanism 2 will move in the opposite direction to raise the fork leg structure 3. During the rising process of the fork leg structure 3, when the fork leg 7 contacts the bottom surface of the second pallet, the second pallet together with the first pallet stacked on the second pallet will be raised to a specified height, that is, to reserve space for the third pallet. After that, the conveyor will convey the third pallet to the bottom of the first pallet... and so on, until a certain number of pallets are stacked. The present invention does not need to set up an extension motor after the fork leg structure 3 of the structure is set up, which greatly reduces the cost on the one hand, and on the other hand, the fork leg structure 3 saves the time required for the original extension motor to start and the extension and contraction of the fork leg, greatly improving the efficiency of stacking. In addition, the original two extension motors will not be out of sync during use and cannot stack the pallets. Finally, after the extension motor is cancelled, the manpower and material resources required for the subsequent maintenance and maintenance of the extension motor are greatly saved.

[0032] The support frame 1 includes a first support frame 8 and a second support frame 9 which are symmetrically arranged on the left and right. The first support frame 8 and the second support frame 9 are fixedly connected by a plurality of connecting rods 10. A shield 11 is fixed to the outside of the first support frame 8 and the second support frame 9. A space for stacking discs is left between the first support frame 8 and the second support frame 9. The conveyor is arranged below the first support frame 8 and the second support frame 9. The setting of the shield 11 improves the stability, firmness and safety of the first support frame 8 and the second support frame 9.

[0033] The lifting mechanism 2 includes a motor 12 fixed on the first support frame 8, a first sprocket 13 is fixed on the rotating shaft of the motor 12, the first sprocket 13 is connected to the second sprocket 15 through a chain 14, a transmission rod 16 is fixed through the center of the second sprocket 15, the left and right ends of the transmission rod 16 are respectively rotatably connected to the second support frame 9 and the first support frame 8, a third sprocket 17 and a fourth sprocket 18 are fixed on the transmission rod 16, the third sprocket 17 is connected to the first chain 19 and the second chain 20, and the upper end of the first chain 19 passes around the fifth sprocket 2 1 and is fixed on the first lifting frame 22, the upper end of the second chain 20 passes around the fifth sprocket 21 and the sixth sprocket 23 and is fixed on the first lifting frame 22, the third chain 24 and the fourth chain 25 are connected to the fourth sprocket 18, the upper end of the third chain 24 passes around the seventh sprocket 26 and is fixed on the second lifting frame 27, the upper end of the fourth chain 25 passes around the seventh sprocket 26 and the eighth sprocket 28 and is fixed on the second lifting frame 27, wherein the lifting mechanism 2 belongs to the prior art, and realizes the synchronous lifting of the first lifting frame 22 and the second lifting frame 27.

[0034] The first lifting frame 22 and the second lifting frame 27 are both arranged in a transverse H-shape and are respectively slidably connected to the first support frame 8 and the second support frame 9. The fork structure 3 is fixed to the first lifting frame 22 and the second lifting frame 27, wherein the first lifting frame 22 and the second lifting frame 27 are both arranged in a transverse H-shape, which facilitates the fixation of the fork structure 3 and the connection with the lifting mechanism 2, wherein the first lifting frame 22 and the second lifting frame 27 are arranged to be slidably connected to the first support frame 8 and the second support frame 9 respectively, which improves the lifting stability.

[0035] A pad 29 is fixed on the bottom surface of the fixed plate 4. The pad 29 serves as a stopper for the fork legs 7 so that the fork legs 7 remain horizontal when carrying the pallet. On the other hand, it plays a certain buffering role and protects both the fixed plate 4 and the fork legs 7.

[0036] The fork leg 7 is T-shaped, and includes a connecting portion 30 rotatably connected to the U-shaped block 5. The inner end of the connecting portion 30 is fixed with a first fork leg portion 31, and the inner end of the first fork leg portion 31 is fixed with a second fork leg portion 32. A buffer slope 33 is provided on the inner end bottom surface of the second fork leg 32, and the buffer slope 33 is set to be higher at the inner end and lower at the outer end. The setting of the buffer slope 33 is that when the vertical fork leg 7 descends along the side of the pallet, when the bottom end of the buffer slope 33 (that is, the outer end of the horizontal buffer slope 33) reaches the bottom of the side of the pallet, then in the process of the fork leg 7 descending again, due to the existence of the buffer slope 33, the fork leg 7 will gradually tilt downward, playing a good buffering role. If there is no buffer slope 33, the fork leg 7 will tilt all at once once it is not blocked, and the force is relatively large, which can easily cause damage to the fork leg structure 3 that needs to be used frequently, and the setting of the buffer slope 33 just avoids this situation. In addition, the arrangement of the buffer slope 33 makes the weight distribution of the first fork leg portion 31 and the second fork leg portion 32 less uniform, so that the fork leg 7 is more likely to fall from a vertical state to a horizontal state when not blocked.

[0037] A groove 34 is provided on the bottom surface of the first fork leg 31, and a plurality of connecting shafts 35 having the same axial direction as the rotating rod 6 are fixed in the groove 34. A plurality of rollers 36 are rotatably connected to each connecting shaft 35. This arrangement can reduce the friction between the first fork leg 31 and the side surface of the pallet during the process of the first fork leg 31 descending along the side surface of the pallet, so that the first fork leg 31 can descend more smoothly, while also reducing the wear on the side surface of the pallet and the wear on the first fork leg 31. In addition, the rollers 36 will generate certain vibrations during the process of descending along the side surface of the pallet, and this vibration makes it easier for the subsequent fork legs 7 to tilt from a vertical state to a horizontal state.

[0038] The rotating rod 6 is arranged near the upper end of the connecting portion 29, and the length of the connecting portion 29 is less than the length of the first fork leg 31. Through this arrangement, the overall center of the fork leg structure 3 is tilted toward the pallet, which makes it easier for the fork leg 7 to tilt from a vertical state to a horizontal state.

[0039] The pad 29 is configured as a rubber pad, on which are provided a number of through holes 37 running through the upper and lower parts thereof, and a magnet 38 is provided in the through hole 37, and the upper end of the magnet 38 is fixed to the bottom surface of the fixing plate 4, and a gap is left between the lower end and the lower end of the through hole 37, wherein the pad 29 is configured as a rubber pad, which further plays a buffering role and protects the fork leg 7 and the fixing plate 4, wherein the setting of the magnet 38 plays the role of a skeleton on the one hand, shaping the pad 29 made of rubber material and increasing the rigidity of the pad 29, and on the other hand, when the fork leg 7 rotates from a vertical direction to a horizontal direction, the magnet 38 has an attraction on the fork leg 7, which greatly improves the speed of the fork leg 7 rotating from a vertical direction to a horizontal direction while ensuring the smooth rotation of the fork leg 7 to a horizontal direction, and further, after the fork leg 7 rotates to a horizontal direction, the fork leg 7 is attracted and fixed to prevent the fork leg 7 from rotating, thereby ensuring the smooth forking of the pallet.

[0040] Working principle: during operation, the palletizer is equipped with a conveyor. First, the conveyor transfers the first pallet to the bottom of the fork structure 3, and then the lifting mechanism 2 is started to lower the fork structure 3. During the descent of the fork structure 3, when the fork 7 touches the edge of the top of the first pallet, it will rotate during the continued descent due to the obstruction of the top of the first pallet. The fork 7 rotates from the original horizontal state to the vertical state, and moves downward along the side of the first pallet. When the top of the fork 7 is lower than the bottom of the side of the first pallet (that is, the fork 7 enters the fork position of the first pallet), the fork 7 will rotate back to the horizontal position due to unobstructed. At this time, the lifting mechanism 2 will move in the opposite direction to lift the fork structure 3. During the ascent of the fork structure 3, when the fork 7 touches the bottom surface of the first pallet, it will lift the first pallet together to the specified height, that is, reserve space for the second pallet. Then the conveyor transports the second pallet to the bottom of the first pallet, and then the lifting mechanism 2 is started to drive the first pallet on it to descend until it is aligned with the fork. The second pallet on the conveyor is stacked together (the pallets can be plugged and stacked), and then the lifting mechanism 2 drives the fork leg 7 to continue to descend. During the descent of the fork leg structure 3, when the fork leg 7 contacts the edge of the top of the second pallet, it will rotate during the continued descent due to the obstruction of the top of the second pallet, and the fork leg 7 will rotate from the original horizontal state to the vertical state, and move downward along the side of the second pallet. When the top of the fork leg 7 is lower than the bottom of the side of the second pallet (that is, the fork leg 7 enters the fork position of the second pallet), the fork leg 7 will rotate back to the horizontal position due to being unobstructed. At this time, the lifting mechanism 2 will move in the opposite direction and lift the fork leg structure 3. During the ascent of the fork leg structure 3, when the fork leg 7 contacts the bottom surface of the second pallet, the second pallet together with the first pallet stacked on the second pallet will be lifted to the specified height, that is, space will be reserved for the third pallet. After that, the conveyor will transport the third pallet to the bottom of the first pallet... and so on. The cycle repeats until a certain number of pallets are stacked. The present invention does not need to set up an extension motor after the fork leg structure 3 is set up, which greatly reduces the cost on the one hand, and on the other hand, the fork leg structure 3 saves the time required for starting the extension motor and extending and contracting the fork legs, greatly improving the efficiency of stacking discs. In addition, the situation in which the two original extension motors are out of sync during use and cannot stack discs will not occur. Finally, after the extension motor is cancelled, the manpower and material resources required for the subsequent maintenance and upkeep of the extension motor are greatly saved.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A motor-free encoder, characterized in that: The invention comprises a support frame (1), wherein a lifting mechanism (2) is provided on the support frame (1), a plurality of fork leg structures (3) are fixed on the lifting mechanism (2), the fork leg structure (3) comprises a fixing plate (4) fixedly connected to the lifting mechanism (2), a U-shaped block (5) is fixed on the bottom surface of the fixing plate (4), a rotating rod (6) is rotatably connected to the U-shaped block (5), and a fork leg (7) is fixed on the rotating rod (6).

2. The motor-free encoder according to claim 1, characterized in that: The support frame (1) comprises a first support frame (8) and a second support frame (9) which are arranged in a bilaterally symmetrical manner; the first support frame (8) and the second support frame (9) are fixedly connected via a plurality of connecting rods (10); and shields (11) are fixed to the outside of the first support frame (8) and the second support frame (9).

3. The motor-free encoder according to claim 2, characterized in that: The lifting mechanism (2) comprises a motor (12) fixed on the first support frame (8), a first sprocket (13) is fixed on the rotating shaft of the motor (12), the first sprocket (13) is connected to the second sprocket (15) through a chain (14), a transmission rod (16) is fixed through the center of the second sprocket (15), the left and right ends of the transmission rod (16) are respectively rotatably connected to the second support frame (9) and the first support frame (8), a third sprocket (17) and a fourth sprocket (18) are fixed on the transmission rod (16), the third sprocket (17) is connected to the first chain (19) and the second sprocket (15), and the third sprocket (17) is connected to the first chain (19) and the second sprocket (15). The chain (20) comprises a first chain (19) and a second chain (20), wherein the upper end of the first chain (19) passes around a fifth sprocket (21) and is fixed on a first lifting frame (22), the upper end of the second chain (20) passes around the fifth sprocket (21) and a sixth sprocket (23) and is fixed on the first lifting frame (22), the third chain (24) and a fourth chain (25) are connected to the fourth sprocket (18), the upper end of the third chain (24) passes around a seventh sprocket (26) and is fixed on a second lifting frame (27), and the upper end of the fourth chain (25) passes around the seventh sprocket (26) and an eighth sprocket (28) and is fixed on the second lifting frame (27).

4. The motor-free encoder according to claim 3, characterized in that: The first lifting frame (22) and the second lifting frame (27) are both arranged in a transverse H-shape and are slidably connected to the first supporting frame (8) and the second supporting frame (9) respectively, and the fork leg structure (3) is fixed to the first lifting frame (22) and the second lifting frame (27).

5. The motor-free encoder according to claim 1, characterized in that: A pad (29) is fixed on the bottom surface of the fixing plate (4).

6. The motor-free encoder according to claim 1, characterized in that: The fork leg (7) is T-shaped and comprises a connecting portion (30) rotatably connected to the U-shaped block (5); a first fork leg portion (31) is fixed to the inner end of the connecting portion (30); a second fork leg portion (32) is fixed to the inner end of the first fork leg portion (31); a buffer slope (33) is provided on the bottom surface of the inner end of the second fork leg portion (32); the buffer slope (33) is arranged with the inner end higher than the outer end.

7. The motor-free encoder according to claim 6, characterized in that: A groove (34) is provided on the bottom surface of the first fork leg (31), a plurality of connecting shafts (35) coaxial with the rotating rod (6) are fixed in the groove (34), and a plurality of rollers (36) are rotatably connected to each connecting shaft (35).

8. The motor-free encoder according to claim 6, characterized in that: The rotating rod (6) is arranged near the upper end of the connecting portion (29), and the length of the connecting portion (29) is smaller than the length of the first fork leg (31).

9. The motor-free encoder according to claim 5, characterized in that: The pad (29) is configured as a rubber pad, on which a plurality of through holes (37) are provided which pass through the pad from top to bottom. A magnet (38) is provided in the through hole (37). The upper end of the magnet (38) is fixed to the bottom surface of the fixed plate (4), and a gap is left between the lower end of the magnet and the lower end of the through hole (37).

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