Thread drawing device of jacquard machine

Abstract

The utility model discloses a thread drawing device of a jacquard machine. The thread drawing device comprises a thread drawing arm for clamping a thread and a driving mechanism for driving the thread drawing arm to swing so as to transversely draw the thread, the wire drawing arm comprises a linkage piece in transmission connection with the driving mechanism, a wire drawing bent pipe arranged on the linkage piece and a wire drawing chuck detachably connected with the wire drawing bent pipe, and the wire drawing chuck comprises a pressing block and a pressing head movably connected with the pressing block; the linkage piece is provided with an air inlet communicated with an external air source and used for feeding airflow into the thread drawing bent pipe to drive the pressing head to be close to the pressing block so as to clamp the silk threads. Two paths of airflow are arranged in the air driving assembly and used for clamping and detecting the silk thread respectively, and whether the silk thread is clamped by the thread drawing chuck or not is judged according to the air pressure change of the air outlet in the pressing head; the pneumatic driving assembly is simple in structure, the detection process is stable and reliable through the mechanical principle, and the machining efficiency is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of textile machinery, in particular to a thread drawing device for a jacquard machine. Background Art

[0002] The original meaning of textile is a general term for spinning and weaving. However, with the continuous development and improvement of the textile knowledge system and discipline system, especially the emergence of non-woven textile materials and three-dimensional composite weaving technologies, textiles are now not only traditional hand spinning and weaving, but also include non-woven technology, modern three-dimensional weaving technology, modern electrostatic nano-netting technology and other production of clothing, industrial and decorative textiles.

[0003] The existing jacquard machine completes the automatic processing by coordinating the wire splitting, feeding and drawing devices with the wire feeding cross setting, and the reed device is set to beat, and the control is completed by combining the information interaction between the bottom driving device and the detection device inside the machine. In the past, whether the wire drawing device successfully clamped the silk thread mostly used an infrared sensing device, and the wire drawing process was prone to mis-blocking, resulting in sending wrong information, affecting production efficiency. Summary of the invention

[0004] In order to overcome the above defects, the utility model provides a thread drawing device for a jacquard machine, which has few parts and components, a simple structure, and adopts mechanical principles to make the detection process stable and reliable to ensure processing efficiency.

[0005] The utility model adopts a technical solution to solve the technical problem as follows: a jacquard machine thread drawing device is provided, comprising a thread drawing arm for clamping silk threads, and a driving mechanism for driving the thread drawing arm to swing to draw the silk threads horizontally; the thread drawing arm comprises a linkage member connected to the driving mechanism in transmission, a thread drawing elbow provided on the linkage member, and a thread drawing chuck detachably connected to the thread drawing elbow, the thread drawing chuck comprises a pressure block and a pressure head movably connected to the pressure block; the linkage member is provided with an air inlet connected to an external air source, which is used to send airflow into the thread drawing elbow to drive the pressure head close to the pressure block to clamp the silk threads;

[0006] The pressing block is arranged on the wire drawing elbow through an air drive assembly, and the air drive assembly includes a first fixed block connected to the pressing block and fixed in the wire drawing elbow, a piston block slidably fitted in the wire drawing elbow, and a return spring arranged between the first fixed block and the piston block;

[0007] The first fixed block is slidably provided with a sleeve, one end of the sleeve is connected to the pressure head, and the other end is connected to the piston block;

[0008] The pressure head is provided with an air outlet, and the sleeve is slidably provided with a detection air pipe which is communicated with the air outlet and sealed with the piston block.

[0009] As a further improvement of the present utility model, the air-driven assembly further includes a connecting pipe and a second fixing block. The first fixing block and the second fixing block are respectively sleeved at two ends of the connecting pipe, and the connecting pipe is in mating connection with the inner wall of the wire-drawing elbow pipe;

[0010] An air chamber is formed between the second fixing block and the piston block. A driving air passage is formed on the second fixing block so that the air chamber communicates with the wire-drawing elbow pipe;

[0011] The second fixing block is further provided with a trachea connector communicated with the detection trachea, and the detection trachea is in sliding and sealing connection with the trachea connector.

[0012] As a further improvement of the present utility model, the pressing block has a "[-]" shaped structure, with a horizontally arranged connecting end, a limiting end, and a vertically arranged stroke end;

[0013] The pressing head has a driving part with a cylindrical structure, and a pressing part arranged on one side facing the limiting end and integrally connected with the driving part;

[0014] The driving part is coaxially arranged with the connecting end and is slidably fitted with the connecting end through the sleeve.

[0015] As a further improvement of the present utility model, a limiting column is arranged on the end face of the pressing head facing the limiting end, and the limiting column is arranged away from the stroke end; a mating channel adapted to the limiting column is arranged on the limiting end;

[0016] The air outlet of the pressing head is arranged close to the stroke end.

[0017] As a further improvement of the present utility model, a guiding long groove is formed on the stroke end of the pressing block along the moving direction of the pressing head, and the side of the pressing part away from the limiting column is slidably fitted in the guiding long groove.

[0018] As a further improvement of the present utility model, the driving part and the pressing part are connected by a tapered part.

[0019] As a further improvement of the present utility model, the linkage member has a "Y"-shaped structure, with a main body part connected to the driving mechanism and branch parts integrally connected to the main body part. Air flow channels are respectively arranged on the two branch parts and the two air flow channels are not communicated with each other;

[0020] The wire-drawing elbow pipe is arranged in an arc shape. The wire-drawing elbow pipes are respectively arranged on the two branch parts, and the two wire-drawing elbow pipes are arranged in mirror symmetry with the midline of the two branch parts as the axis.

[0021] As a further improvement of the present utility model, an air inlet is respectively provided on each of the branch portions, and the air inlet is configured as follows:

[0022] A first air inlet, which is used to connect an air source to the wire-drawing elbow pipe to drive the piston block of the air-driven assembly to move along the connecting pipe;

[0023] A second air inlet, which is connected to the air pipe joint through an air-sending elbow pipe and is used to connect an air source to the detection air pipe;

[0024] Wherein, the air pressure intensity introduced through the first air inlet is greater than the air pressure intensity introduced through the second air inlet.

[0025] As a further improvement of the present utility model, a clamping block for clamping the wire-drawing elbow pipe is integrally connected to the outlet end portion of each of the branch portions.

[0026] As a further improvement of the present utility model, the driving mechanism includes a driving motor, a main pulley provided on the output shaft of the driving motor, and a driven pulley provided on the main body portion of the linkage member. The main pulley and the driven pulley are connected by a toothed belt in a transmission manner.

[0027] The beneficial effects of the present utility model are as follows:

[0028] 1. The wire-drawing chuck is connected to the wire-drawing elbow pipe through an air-driven assembly, and two airflows are provided in the air-driven assembly respectively for clamping and detecting the wire. The air pressure change at the air outlet of the pressing head is used to determine whether the wire-drawing chuck clamps the wire. The air-driven assembly has a simple structure, and the clamping and detection are stable and reliable by using mechanical principles;

[0029] 2. The clamping force of the pressing head is controlled by air pressure drive, the structure is compact, and the clamping force of the pressing head can be adjusted by controlling the magnitude of the inlet and outlet gas pressures. It is matched with the detection air outlet to ensure the stability and reliability of wire clamping and ensure the processing efficiency;

[0030] 3. The wire-drawing operation is performed by driving two groups of wire-drawing elbow pipes to reciprocally swing through a driving motor, which occupies a small space, has high efficiency and is convenient to operate. Description of the Drawings

[0031] Figure 1 It is a structural schematic diagram of the present utility model;

[0032] Figure 2 It is an exploded structural schematic diagram of the present utility model without an air-driven assembly;

[0033] Figure 3 It is a sectional structural schematic diagram of the cooperation between the linkage member and the wire-drawing elbow pipe of the present utility model;

[0034] Figure 4It is a structural schematic diagram of the cooperation between the wire drawing chuck and the air drive assembly of the utility model.

[0035] Combined with the accompanying drawings, the following description is given:

[0036] 1. Wire drawing arm; 11. Linkage; 111. Air inlet; 1111. First air inlet; 1112. Second air inlet; 112. Main body; 113. Branch; 1131. Air flow channel; 114. Clamping block; 12. Wire drawing elbow; 13. Wire drawing chuck; 131. Pressing block; 1311. Connecting end; 1312. Limiting end; 13121. Matching channel; 1313. Travel end; 13131. Long guide groove; 132. Pressing head; 1321. air outlet; 1322. driving part; 1323. pressing part; 1324. limiting column; 1325. conical part; 2. driving mechanism; 21. driving motor; 22. main pulley; 23. passive pulley; 24. toothed belt; 3. air drive assembly; 31. first fixed block; 32. piston block; 33. return spring; 34. sleeve; 35. detection air pipe; 36. connecting pipe; 37. second fixed block; 38. air chamber; 39. air pipe joint. DETAILED DESCRIPTION

[0037] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0038] See also Figures 1 to 4 The utility model provides an embodiment of a thread drawing device of a jacquard machine, which cooperates with a thread feeding device of the jacquard machine to clamp the thread sent by the thread feeding device and draw it horizontally to combine it with the weft thread. It includes a thread drawing arm 1 for clamping the thread, and a driving mechanism 2 for driving the thread drawing arm 1 to swing at a set angle and draw the thread horizontally.

[0039] Among them, the wire drawing arm 1 includes a linkage part 11 which is transmission-connected to the driving mechanism 2, a wire drawing elbow 12 arranged on the linkage part 11, and a wire drawing chuck 13 which is detachably connected to the wire drawing elbow 12, the wire drawing chuck 13 includes a pressure block 131 and a pressure head 132 movably connected to the pressure block 131; the linkage part 11 is provided with an air inlet 111 connected to an external air source, which is used to send airflow into the wire drawing elbow 12 to drive the pressure head 132 to approach the pressure block 131 to clamp the silk thread.

[0040] The briquetting block 131 is arranged on the wire-drawing elbow 12 through the pneumatic driving component 3. The pneumatic driving component 3 includes a first fixing block 31 connected to the briquetting block 131 and fixedly installed in the wire-drawing elbow 12, a piston block 32 slidably fitted in the wire-drawing elbow 12, and a return spring 33 arranged between the first fixing block 31 and the piston block 32. The first fixing block 31 is slidably fitted with a sleeve 34. One end of the sleeve 34 is connected to the pressure head 132, and the other end is connected to the piston block 32. An air outlet 1321 is formed on the pressure head 132, and a detection air pipe 35 communicating with the air outlet 1321 and hermetically connected to the piston block 32 is slidably fitted in the sleeve 34.

[0041] Specifically, an O-ring seal is provided between the piston block 32 and the wire-drawing elbow 12, so that the piston block 32 can move in the wire-drawing elbow 12 when driven by air pressure. The two ends of the return spring 33 are elastically abutted against the first fixing block 31 and the piston block 32 respectively. Therefore, as the piston block 32 moves under force, the return spring 33 can be compressed, and after the external force is eliminated, the piston block 32 can return under the action of the return spring 33. When the piston block 32 moves, it drives the sleeve 34 to move so that the pressure head 132 connected to the sleeve 34 approaches the briquetting block 131 to clamp the wire. When the wire-drawing chuck 13 clamps the wire, the wire blocks the air outlet 1321, causing a change in the air pressure introduced into the detection air pipe 35, thereby determining that the wire-drawing chuck 13 has clamped the wire. It can be understood that a pressure sensor is provided at the air supply end of the detection air pipe 35 to monitor the change in air pressure.

[0042] Furthermore, the pneumatic driving component 3 further includes a connecting pipe 36 and a second fixing block 37. The first fixing block 31 and the second fixing block 37 are respectively sleeved at both ends of the connecting pipe 36, and the connecting pipe 36 is connected to the inner wall of the wire-drawing elbow 12 in a matching manner. An air chamber 38 is formed between the second fixing block 37 and the piston block 32. A driving air passage communicating with the wire-drawing elbow 12 is formed on the second fixing block 37. When air flow is delivered into the wire-drawing elbow 12, the air flow enters the air chamber 38 through the driving air passage on the second fixing block 37 to drive the piston block 32 to move towards the side of the first fixing block 31, and synchronously drives the sleeve 34 to make the pressure head 132 approach the briquetting block 131 to clamp the wire. The setting of the connecting pipe 36 enables other components of the pneumatic driving component 3 to be formed in a sealed environment to ensure the air pressure driving sealability; in addition, the wire-drawing chuck 13 has an integral structure, which is convenient for the disassembly, assembly and replacement of the wire-drawing chuck 13.

[0043] The second fixed block 37 is also provided with an air pipe joint 39 communicated with the detection air pipe 35. The detection air pipe 35 is slidably and sealingly connected with the air pipe joint 39. The air pipe joint 39 is used for connecting with an air supply elbow pipe (not shown in the figure) to provide a detection air flow for the air outlet 1321. Therefore, when the pressing head 132 moves towards the pressing block 131, the detection air pipe 35 moves synchronously without driving the air supply elbow pipe to move. It can be understood that to ensure the sealing performance between the detection air pipe 35 and the air pipe joint 39, when the wire clamping chuck 13 clamps the wire, the end of the detection air pipe 35 is still placed inside the air pipe joint 39, and an O-ring is arranged on the peripheral wall of the end of the detection air pipe 35 to ensure that it is still in a sealed state with the inner peripheral wall of the air pipe joint 39 during the movement process, so as to ensure that the air flow in the detection air pipe 35 is only provided by the air supply elbow pipe.

[0044] Furthermore, the pressing block 131 has a "[-]" shaped structure, with a horizontally arranged connecting end 1311, a limiting end 1312, and a vertically arranged stroke end 1313. The connecting end 1311 is connected to the first fixed block 31; the pressing head 132 has a driving part 1322 with a cylindrical structure, and a pressing part 1323 arranged on one side facing the limiting end 1312 and integrally connected to the driving part 1322; the driving part 1322 is coaxially arranged with the connecting end 1311 and is slidably fitted on the connecting end 1311 through a sleeve 34. That is, through holes for the sleeve 34 to pass through are provided in the connecting end 1311 of the pressing block 131, the middle of the first fixed block 31, and the piston block 32. It can be understood that sealing rings or gaskets will be arranged at the positions where the outer peripheral wall of the sleeve 34 cooperates with the connecting end 1311, the first fixed block 31, and the piston block 32 to ensure the sealing performance.

[0045] A limiting post 1324 is arranged on the end face of the pressing head 132 facing the limiting end 1312, and the limiting post 1324 is arranged away from the stroke end 1313; a matching channel 13121 adapted to the limiting post 1324 is arranged on the limiting end 1312; the air outlet 1321 is arranged close to the stroke end 1313. When the pressing head 132 moves, the limiting post 1324 is inserted into the matching channel 1321 to ensure the balance of the clamping and releasing actions of the pressing head 132, so as to increase the stability of the movement of the pressing head 132. The air outlet 1321 is arranged close to the stroke end 1313 for facilitating the detection of the wire.

[0046] Furthermore, a guiding long groove 13131 is formed on the stroke end 1313 of the pressing block 131 along the moving direction of the pressing head 132. The side of the pressing part 1323 away from the limiting post 1324 is slidably fitted in the guiding long groove 13131. The stability of the movement process of the pressing head is further improved to ensure the continuous effectiveness of the wire clamping chuck.

[0047] Furthermore, the linkage member 11 is of a "Y" shape, having a main body portion 112 connected to the driving mechanism 2 and branch portions 113 integrally connected to the main body portion 112. Each of the two branch portions 113 is provided with an air flow channel 1131, and the two air flow channels 1131 are not connected to each other. The wire-drawing elbow 12 is arranged in an arc shape, and the wire-drawing elbows 12 are respectively provided on the two branch portions 113. The two wire-drawing elbows 12 are arranged symmetrically with respect to the midline of the two branch portions 113 as the axis.

[0048] The outlet end portions of each branch portion 113 are integrally connected with clamping blocks 114 for clamping the wire-drawing elbows 12. By passing fastening bolts through the clamping blocks 114, the two clamping pieces of the clamping blocks 114 are brought closer to clamp the wire-drawing elbows 12, and at the same time, it is also convenient for the disassembly and replacement of the wire-drawing elbows 12.

[0049] Specifically, the two wire-drawing elbows 12 and the linkage member 11 approximately form an "M" shape in the top view direction, and swing horizontally at the horizontal position under the drive of the driving mechanism 2. The wire-drawing chucks 13 at both ends can operate alternately without affecting each other. When one wire-drawing chuck 13 clamps the silk thread and brings it back, the other wire-drawing chuck 13 is just on the way to clamp the thread. The driving mechanism 2 can perform wire drawing twice in one stroke, improving the production efficiency of the wire-drawing process.

[0050] Furthermore, air inlets 111 are respectively arranged on each branch portion 113, and the air inlets 111 are configured to have a first air inlet 1111 and a second air inlet 1112 respectively connected to two air sources. The first air inlet 1111 is used to connect an air source into the wire-drawing elbow 12 to drive the piston block 32 of the air-driven assembly 3 to move along the connecting pipe 36, that is, the first air inlet 1111 sends the air flow used to drive the pressure head 132 to move. The second air inlet 1112 is connected to the air pipe joint 39 through an air supply elbow and is used to connect an air source to the detection air pipe 35, that is, to detect whether the silk thread is clamped on the wire-drawing chuck 13. Since the second air inlet 1112 is connected to the air flow for detection, a small air pressure air flow can be connected. The first air inlet 1111 is connected to the air flow for driving the piston block 32 to move, so a large air pressure air flow is connected.

[0051] It can be understood that the air supply elbow is placed inside the wire-drawing elbow 12 and has a diameter smaller than the inner diameter of the wire-drawing elbow 12, so that the movement of the pressure head and the detection of the clamped thread are controlled separately, the clamping of the thread and the detection do not interfere with each other, and the detection is more accurate. The mechanical principle of air pressure change makes the detection process stable and reliable.

[0052] Furthermore, the driving mechanism 2 includes a driving motor 21, a main pulley 22 provided on the output shaft of the driving motor 21, and a passive pulley 23 provided on the main body 112 of the linkage member 11, and the main pulley 22 and the passive pulley 23 are connected by a toothed belt 24. The linkage member 11 rotates with the central axis of the passive pulley 23 as the axis, so that the wire drawing chuck 13 on the linkage member 11 accurately switches between the two positions of clamping the wire and releasing the wire each time, ensuring the uniformity of the action, and adopting the rotating wire drawing method, which occupies less space, has a simple structure, and is easy to operate.

[0053] In summary, in the jacquard machine thread drawing device provided by the utility model, the thread drawing chuck is connected to the thread drawing elbow through an air drive component, and two air flows are arranged in the air drive component for clamping and detecting the silk thread respectively, and the air pressure change at the air outlet on the pressure head is used to determine whether the thread drawing chuck clamps the silk thread; the air drive component has a simple structure, and the mechanical principle is used to make the detection process stable and reliable; in addition, the clamping force of the pressure head is controlled by air pressure drive, the structure is compact, and the clamping force of the pressure head can be adjusted by controlling the size of the inlet and outlet gas pressures, and the detection outlet is cooperated to ensure the stability and reliability of the thread clamping, thereby ensuring the processing efficiency; and the two sets of thread drawing elbows are driven by a driving motor to perform thread drawing operations in a reciprocating swinging manner, which occupies a small space, has high efficiency and is easy to operate.

[0054] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A jacquard machine thread extraction device, characterized in that: It comprises a wire drawing arm (1) for clamping a wire, and a driving mechanism (2) for driving the wire drawing arm (1) to swing so as to draw the wire horizontally; the wire drawing arm (1) comprises a linkage member (11) connected to the driving mechanism (2), a wire drawing elbow (12) provided on the linkage member (11), and a wire drawing clamp (13) detachably connected to the wire drawing elbow (12), the wire drawing clamp (13) comprising a pressure block (131) and a pressure head (132) movably connected to the pressure block (131); the linkage member (11) is provided with an air inlet (111) connected to an external air source, and is used to send airflow into the wire drawing elbow (12) to drive the pressure head (132) to approach the pressure block (131) so as to clamp the wire; The pressure block (131) is arranged on the wire drawing bend (12) through an air drive assembly (3), and the air drive assembly (3) comprises a first fixed block (31) connected to the pressure block (131) and fixed in the wire drawing bend (12), a piston block (32) slidably fitted in the wire drawing bend (12), and a return spring (33) arranged between the first fixed block (31) and the piston block (32); The first fixed block (31) is slidably equipped with a sleeve (34), one end of the sleeve (34) is connected to the pressure head (132), and the other end is connected to the piston block (32); The pressure head (132) is provided with an air outlet (1321), and the sleeve (34) is slidably provided with a detection air pipe (35) which is in communication with the air outlet (1321) and is sealedly connected to the piston block (32).

2. The jacquard machine thread drawing device according to claim 1, wherein: The air drive assembly (3) further comprises a connecting pipe (36) and a second fixing block (37), wherein the first fixing block (31) and the second fixing block (37) are respectively sleeved on two ends of the connecting pipe (36), and the connecting pipe (36) is cooperatively connected with the inner wall of the wire drawing elbow (12); An air chamber (38) is formed between the second fixed block (37) and the piston block (32), and a driving air passage is provided on the second fixed block (37) so that the air chamber (38) is in communication with the wire drawing elbow (12); The second fixing block (37) is also provided with an air pipe joint (39) which is in communication with the detection air pipe (35); the detection air pipe (35) is slidably and sealingly connected to the air pipe joint (39).

3. The jacquard machine thread drawing device according to claim 2, characterized in that: The pressing block (131) has a "["-shaped structure, and comprises a horizontally arranged connecting end (1311) and a limiting end (1312), and a vertically arranged travel end (1313); The pressure head (132) comprises a driving portion (1322) in a cylindrical structure, and a pressing portion (1323) arranged on a side facing the limiting end (1312) and integrally connected with the driving portion (1322); The driving portion (1322) is coaxially arranged with the connecting end (1311) and is slidably fitted to the connecting end (1311) via the sleeve (34).

4. The jacquard thread drawing device according to claim 3, characterized in that: A limiting column (1324) is provided on the end surface of the pressure head (132) facing the limiting end (1312), and the limiting column (1324) is arranged away from the stroke end (1313); the limiting end (1312) is provided with a matching channel (13121) adapted to the limiting column (1324); The air outlet (1321) of the pressure head (132) is arranged close to the stroke end (1313).

5. The jacquard wire drawing device according to claim 4, characterized in that: A long guide groove (13131) is provided on the stroke end (1313) of the pressing block (131) along the moving direction of the pressing head (132), and the side of the clamping portion (1323) away from the limiting column (1324) is slidably fitted in the long guide groove (13131).

6. The jacquard thread drawing device according to claim 5, characterized in that: The driving portion (1322) and the pressing portion (1323) are transitionally connected via a tapered portion (1325).

7. The jacquard thread drawing device according to claim 6, characterized in that: The linkage member (11) is a "Y"-shaped structure, comprising a main body (112) connected to the driving mechanism (2), and a branch portion (113) integrally connected to the main body (112), the two branch portions (113) being respectively provided with an air flow channel (1131), and the two air flow channels (1131) are not interconnected; The wire drawing bend (12) is arranged in an arc shape, and the wire drawing bend (12) is arranged on the two branch parts (113) respectively. The two wire drawing bends (12) are arranged in a mirror-symmetrical manner with the center line of the two branch parts (113) as the axis.

8. The jacquard machine thread drawing device according to claim 7, characterized in that: The air inlet (111) is respectively arranged on each of the branch portions (113), and the air inlet (111) is configured as follows: A first air inlet (1111) is used to connect the wire extraction elbow (12) to an air source so as to drive the piston block (32) of the air drive assembly (3) to move along the connecting pipe (36); A second air inlet (1112) is connected to the air pipe joint (39) via an air delivery elbow and is used to connect the detection air pipe (35) to an air source; The intensity of the air pressure entering through the first air inlet (1111) is greater than the intensity of the air pressure entering through the second air inlet (1112).

9. The jacquard thread drawing device according to claim 8, wherein: The air outlet end of each branch portion (113) is integrally connected with a clamping block (114) for clamping the wire drawing elbow (12).

10. The jacquard thread drawing device according to claim 9, wherein: The driving mechanism (2) comprises a driving motor (21), a main pulley (22) arranged on the output shaft of the driving motor (21), and a passive pulley (23) arranged on the main body (112) of the linkage member (11); the main pulley (22) and the passive pulley (23) are connected to each other via a toothed belt (24).

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