Machine head module for cutting bed

Abstract

The invention provides a machine head module for a cutting bed. The machine head module comprises a base, a rotating sleeve capable of moving up and down and rotatably mounted on the base, a quick-change mounting seat screwed on the periphery of the upper end of the rotating sleeve in a threaded mode, and a fixed limiting pin with the inner end fixed to the rotating sleeve. An internal thread and a circle of mounting groove are arranged on the inner circumferential surface of the quick-change mounting seat, the outer end of the fixed limiting pin is accommodated in the mounting groove, the upper groove wall and the lower groove wall of the mounting groove respectively form a lower rotation limiting surface and an upper rotation limiting surface, and the internal thread has a set zero starting point; at least one inner inserting groove is formed in the upper end of the rotating sleeve, at least one outer inserting groove is formed in the upper end of the quick-change mounting base, and the lower end of the outer inserting groove extends to the mounting groove. According to the machine head module, the rotating quick-changing mounting base is rotated by a preset angle, so that the rotating quick-changing mounting base can be located at an unlocking position or a locking position, the cutter module can be conveniently installed or detached, quick changing of the cutter module in the machine head module is achieved, and the changing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cutting machines, and in particular to a head module for cutting machines. Background Art

[0002] A cutting machine is a cutting device used for automatically cutting pieces, and is widely used in industries such as textiles and clothing, automotive interiors, furniture, luggage, and outdoor products. The cutting machine is equipped with a head module and multiple cutting modules. The multiple cutting modules are suitable for different cutting objects. The cutting module can be detachably installed in the head module, and the head module drives the cutting module to move up and down and rotate. However, in existing cutting machines, the disassembly, assembly, and replacement of the cutting module in the head module is relatively cumbersome, and the quick disassembly, assembly, and replacement of the cutting module cannot be achieved, which directly affects the cutting efficiency of the pieces. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a head module for a cutting machine, which can conveniently and quickly replace different cutting knife modules in the head module.

[0004] To achieve the above-mentioned purpose, the present invention provides a head module for a cutting machine, which is used for loading a cutting knife module, wherein a mounting protrusion is fixedly arranged on the outer wall of the cutting knife module, and the head module comprises a base, a rotating sleeve which can be moved up and down and rotatably mounted on the base, a quick-change mounting seat which is threadedly screwed on the outer periphery of the upper end of the rotating sleeve, and a fixed limit pin whose inner end is fixed to the rotating sleeve; an inner circumferential surface of the quick-change mounting seat is provided with an internal thread and a circle of mounting grooves, the outer end of the fixed limit pin is accommodated in the mounting groove, the upper groove wall and the lower groove wall of the mounting groove respectively constitute a downward rotation limit surface and an upward rotation limit surface, and the internal thread has a set zero position starting point; at least one inner plug-in groove is provided at the upper end of the rotating sleeve, and at least one outer plug-in groove is provided at the upper end of the quick-change mounting seat, and the lower end of the outer plug-in groove extends to the mounting groove;

[0005] When the quick-change mounting seat is rotated to the unlocked position, the outer insertion slot and the inner insertion slot are aligned inside and outside, and the mounting protrusion of the cutter module is allowed to be inserted into the mounting slot through the outer insertion slot and the inner insertion slot, and the upward rotation limit surface abuts against the lower end side of the fixed limit pin;

[0006] When the quick-change mounting seat is rotated to the locking position, the outer insertion slot is circumferentially misaligned with the inner insertion slot, and the downward rotation limit surface, the mounting protrusion and the bottom of the inner insertion slot are pressed against each other in sequence from top to bottom;

[0007] The zero starting point of the internal thread makes the rotation angle of the quick-change mounting seat from the unlocking position to the locking position and the rotation angle of the quick-change mounting seat from the locking position to the unlocking position both be preset angles.

[0008] Furthermore, the zero position starting point of the internal thread is located at the lower end of the external insertion slot.

[0009] Furthermore, there are two inner insertion grooves, which are distributed at intervals of 180° along the circumference of the rotating sleeve, and there are two outer insertion grooves, which are distributed at intervals of 180° along the circumference of the quick-change mounting seat.

[0010] Furthermore, a preload ring is installed in the quick-change mounting seat, and the preload ring is distributed on the lower side of the mounting groove. The preload ring is pressed between the rotating sleeve and the quick-change mounting seat along the radial direction of the rotating sleeve.

[0011] Furthermore, the head module for the cutting machine also includes a lifting drive source installed on the base, a lifting seat installed on the base movably up and down, a lifting transmission mechanism, a rotation drive source installed on the lifting seat, and a rotation transmission mechanism, the lifting drive source is connected to the lifting seat through the lifting transmission mechanism, the rotating sleeve is rotatably installed in the lifting seat through a first bearing, and the rotation drive source is connected to the rotating sleeve through the rotation transmission mechanism.

[0012] Furthermore, the lifting drive source is a motor, and the lifting transmission mechanism includes a transmission screw extending up and down, and a transmission nut threadedly matched with the transmission screw. The motor shaft of the lifting drive source is connected to the upper end of the transmission screw through a first coupling, and the transmission screw is rotatably mounted on the base through a second bearing, and the transmission nut is fixedly connected to the lifting seat.

[0013] Furthermore, the head module for the cutting machine also includes a linear guide rail assembly assembled between the base and the lifting seat, and the linear guide rail in the linear guide rail assembly is parallel to the transmission screw.

[0014] Further, the rotational drive source is a motor, and the rotational transmission mechanism includes a transmission shaft rotatably supported in the lifting seat through a third bearing, a driving synchronous pulley fixed on the transmission shaft, a driven synchronous pulley fixed on the outer periphery of a rotating sleeve, and a synchronous belt. The motor shaft of the rotational drive source is connected to the upper end of the transmission shaft through a second coupling, and the driving synchronous pulley and the driven synchronous pulley are connected through a synchronous belt.

[0015] As described above, the head module for a cutting machine according to the present invention has the following beneficial effects:

[0016] The present application can put the quick change in the unlocked position or locked position by rotating the quick change mounting seat to a preset angle, which makes it convenient to install or remove the cutter module. During operation, only the quick change mounting seat needs to be rotated and the cutter module needs to be inserted or removed. The operation is very convenient and convenient. The quick change of the cutter module in the head module is conveniently realized, thereby improving the replacement efficiency and thus improving the working efficiency of the cutting table. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figures 1 to 3 This is a schematic diagram of the structure of the head module used in the cutting machine of this application at different viewing angles.

[0018] Figure 4 for Figure 1 Top view of the .

[0019] Figure 5 for Figure 4 AA section view.

[0020] Figure 6 for Figure 4 BB section view.

[0021] Figure 7 for Figure 6 Schematic diagram of the structure at the connection between the rotating sleeve and the quick-change mounting seat.

[0022] Figure 8 This is a schematic diagram of the structure of the head module used in the cutting machine of the present application at the upper end of the rotating sleeve after the quick-change mounting base is omitted.

[0023] Fig. 9 It is a schematic diagram of the structure of the cutting knife module installed in the head module of the cutting bed of the present application.

[0024] Component number description

[0025] 10 Cutter module

[0026] 101 Mounting bumps

[0027] 20 Base

[0028] 30 Rotating sleeve

[0029] 31 Internal slots

[0030] 40 Quick-Change Mount

[0031] 41 Mounting slot

[0032] 42 Backward rotation limit surface

[0033] 43 Top rotation limit surface

[0034] 44 external plug-in slots

[0035] 50 Fixed stop pin

[0036] 60 Preload ring

[0037] 70 Lifting drive source

[0038] 80 Lifting seat

[0039] 90 Rotation drive source

[0040] 110 First bearing

[0041] 120 Drive screw

[0042] 130 First coupling

[0043] 140 Second bearing

[0044] 150 Linear Guide Assemblies

[0045] 160 Third bearing

[0046] 171 Transmission shaft

[0047] 172 Active synchronous pulley

[0048] 173 Driven synchronous pulley

[0049] 174 Timing belt

[0050] 180 Second coupling DETAILED DESCRIPTION

[0051] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0052] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0053] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0054] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0055] The present application provides a head module for a cutting machine, the head module is used to load Fig. 9 The cutter module 10 shown. Fig. 9 As shown, a pair of mounting protrusions 101 are fixedly provided on the outer wall of the cutter module 10, and the cutter module 10 is locked in the head module of the present application through the mounting protrusions 101. In addition, the head module of the present application is installed in the cutting table, and the cutting table is equipped with an X-axis truss mechanism and a Y-axis truss mechanism. The X-axis truss mechanism has an X-axis slider that can move forward and backward along the X-direction, and the Y-axis truss mechanism is fixed on the X-direction slider. The Y-axis truss mechanism has a Y-direction slider that can move left and right along the Y-direction. The head module involved in the present application is fixed on the Y-direction slider, and is driven to move forward and backward and left and right by the X-axis truss mechanism and the Y-axis truss mechanism.

[0056] like Figures 1 to 4 ,as well as Figures 6 to 8 As shown, the head module involved in the present application includes a base 20, a rotating sleeve 30 that can be moved up and down and rotatably installed on the base 20, a quick-change mounting seat 40 that is screwed on the outer periphery of the upper end of the rotating sleeve 30, and a fixed stop pin 50 whose inner end is fixed to the rotating sleeve 30; wherein the base 20 is fixed on the Y-direction slider of the cutting table, thereby fixing the head module as a whole on the Y-direction slider of the cutting table; the inner circumferential surface of the quick-change mounting seat 40 is provided with an internal thread and a circle of concave mounting holes. The mounting groove 41; the fixed limit pin 50 extends straight along the radial direction of the rotating sleeve 30, and the outer end of the fixed limit pin 50 is accommodated in the mounting groove 41; the upper groove wall and the lower groove wall of the mounting groove 41 respectively constitute the downward rotation limit surface 42 and the upward rotation limit surface 43, and the internal thread has a set zero position starting point; at least one internal insertion groove 31 is opened at the upper end of the rotating sleeve 30, and at least one external insertion groove 44 is opened at the upper end of the quick-change mounting seat 40, and the lower end of the external insertion groove 44 extends to the mounting groove 41.

[0057] The quick-change mounting seat 40 is threadedly connected to the upper end of the rotating sleeve 30, so the quick-change mounting seat 40 can rotate relative to the rotating sleeve 30 and can move up and down, so that the quick-change mounting seat 40 can be in an unlocked position or a locked position. When the quick-change mounting seat 40 is rotated to the unlocked position, the outer insertion groove 44 at the upper end of the quick-change mounting seat 40 and the inner insertion groove 31 at the upper end of the rotating sleeve 30 are aligned inside and outside, allowing the mounting protrusion 101 of the cutter module 10 to be inserted into the mounting groove 41 through the outer insertion groove 44 and the inner insertion groove 31, and the upper rotation limit surface 43 abuts against the lower end side of the fixed limit pin 50. When the quick-change mounting seat 40 is rotated to the locked position, the outer insertion groove 44 and the inner insertion groove 31 are circumferentially misaligned, and the lower rotation limit surface 42, the mounting protrusion 101 and the groove bottom of the inner insertion groove 31 are pressed tightly from top to bottom. In addition, the internal thread on the inner circumferential surface of the quick-change mounting seat 40 is set with a zero starting point, which makes the rotation angle of the quick-change mounting seat 40 from the unlocked position to the locked position, and the rotation angle of the quick-change mounting seat 40 from the locked position to the unlocked position both preset angles. In this embodiment, the preset angle is 90°.

[0058] When the cutter module 10 is installed in the head module of the present application, the quick-change mounting seat 40 is rotated to the unlocking position. At this time, the outer insertion slot 44 and the inner insertion slot 31 are aligned inside and outside and connected. The mounting protrusion 101 of the cutter module 10 is aligned with the outer insertion slot 44 and the inner insertion slot 31, and the cutter module 10 is inserted downward into the rotating sleeve 30 until the mounting protrusion 101 of the cutter module 10 is inserted downward into the mounting slot 41 of the quick-change mounting seat 40; then, the quick-change mounting seat 40 is rotated 90° along the first direction, and the quick-change mounting seat 40 is rotated to the locking position. During this process, the quick-change mounting seat 40 moves downward at the same time. At this time, the outer insertion slot 44 and the inner insertion slot 31 are aligned. The mounting groove 31 is circumferentially offset, and the downward rotation limit surface 42, the mounting protrusion 101 and the bottom of the inner insertion groove 31 are pressed against each other from top to bottom in sequence. On the one hand, the cutter module 10 is locked in the rotating sleeve 30 and the quick-change mounting seat 40, so that the cutter module 10 can move with the rotating sleeve 30 and the quick-change mounting seat 40. On the other hand, the downward rotation limit surface 42, the mounting protrusion 101 and the bottom of the inner insertion groove 31 are pressed against each other to limit the further downward movement of the quick-change mounting seat 40, that is, to limit the further rotation of the quick-change mounting seat 40 in the first direction, so that the quick-change mounting seat 40 in the unlocked position can only rotate in the first direction to the locked position, but cannot continue to rotate in the first direction.

[0059] When the cutter module 10 is detached from the head module, the locking position is rotated 90° in the second direction, which is opposite to the first direction, namely clockwise and counterclockwise respectively, and the quick-change mounting seat 40 is rotated to the unlocked position. At this time, the outer insertion slot 44 and the inner insertion slot 31 are aligned inside and outside, and the mounting protrusion 101 of the cutter module 10 can be moved upward from the mounting slot 41 through the outer insertion slot 44 and the inner insertion slot 31, so that the cutter module 10 is moved out of the head module, and the upward rotation limit surface 43 abuts against the lower end side of the fixed limit pin 50, limiting the continued upward movement of the quick-change mounting seat 40, that is, limiting the quick-change mounting seat 40 from continuing to rotate in the second direction, so that the quick-change mounting seat 40 in the locked position can only rotate in the second direction to the unlocked position, but cannot continue to rotate in the second direction.

[0060] Therefore, the present application can make the quick change in the unlocked position or the locked position by rotating the quick change mounting seat 40 to a preset angle, so as to facilitate the installation of the cutter module 10 or the removal of the cutter module 10. During operation, it is only necessary to rotate the quick change mounting seat 40 and insert or remove the cutter module 10. The operation is very convenient, and the quick change of the cutter module 10 in the head module is conveniently realized, thereby improving the replacement efficiency, and thus improving the working efficiency of the cutting table.

[0061] Preferably, if Figure 1 and Figure 4 As shown, there are two inner insertion slots 31, which are spaced 180° apart along the circumference of the rotating sleeve 30, and there are two outer insertion slots 44, which are spaced 180° apart along the circumference of the quick-change mounting seat 40; accordingly, there are also two mounting protrusions 101 on the cutter module 10, which are spaced 180° apart. In addition, the zero position starting point of the internal thread on the inner wall of the quick-change mounting seat 40 is located at the lower end of the outer insertion slot 44.

[0062] Furthermore, if Figure 7 As shown, a pre-tightening ring 60 is installed in the quick-change mounting seat 40, and the pre-tightening ring 60 is distributed on the lower side of the mounting groove 41. The pre-tightening ring 60 is pressed between the rotating sleeve 30 and the quick-change mounting seat 40 along the radial direction of the rotating sleeve 30. The pre-tightening ring 60 is preferably an O-ring, which applies radial force to the rotating sleeve 30 by extrusion, so that the cutter module 10 is more reliably locked in the rotating sleeve 30 and the quick-change mounting seat 40, and the cutter module 10 is prevented from radial movement.

[0063] Furthermore, if Figures 1 to 3 ,as well as Figure 6As shown, the head module for the cutting bed also includes a lifting drive source 70 installed on the base 20, a lifting seat 80 movably installed on the base 20, a lifting transmission mechanism, a rotation drive source 90 installed on the lifting seat 80, and a rotation transmission mechanism. The lifting drive source 70 is connected to the lifting seat 80 through the lifting transmission mechanism, the rotating sleeve 30 is rotatably installed in the lifting seat 80 through the first bearing 110, and the rotation drive source 90 is connected to the rotating sleeve 30 through the rotation transmission mechanism. When the lifting drive source 70 is in motion, the lifting seat 80 is driven to move up and down through the lifting transmission mechanism, and the lifting seat 80 drives the rotation drive source 90, the rotation transmission mechanism, the rotating sleeve 30, the quick-change mounting seat 40 and the cutting module 10 to move up and down together. When the rotation drive source 90 is in motion, the rotating sleeve 30 is driven to rotate through the rotation transmission mechanism, and the rotating sleeve 30 drives the quick-change mounting seat 40 and the cutting module 10 to rotate together.

[0064] Preferably, if Figure 5 As shown, the lifting drive source 70 is a motor, preferably a stepping motor; the lifting transmission mechanism includes a transmission screw 120 extending up and down, and a transmission nut threadedly matched with the transmission screw 120. The motor shaft of the lifting drive source 70 is connected to the upper end of the transmission screw 120 through a first coupling 130. The transmission screw 120 is rotatably mounted on the base 20 through a second bearing 140, and the transmission nut is fixedly connected to the lifting seat 80. Figure 3 and Figure 5 As shown, the head module for the cutting machine also includes a linear guide assembly 150 assembled between the base 20 and the lifting seat 80. The linear guide in the linear guide assembly 150 is parallel to the transmission screw 120, so that the lifting seat 80 moves up and down more smoothly.

[0065] Preferably, if Figure 5 and Figure 8 As shown, the rotational driving source 90 is a motor, preferably a stepping motor; the rotational transmission mechanism includes a transmission shaft 171 rotatably supported in the lifting seat 80 through a third bearing 160, a driving synchronous pulley 172 fixed on the transmission shaft 171, a driven synchronous pulley 173 fixed on the outer periphery of the rotating sleeve 30, and a synchronous belt 174. The motor shaft of the rotational driving source 90 is connected to the upper end of the transmission shaft 171 through a second coupling 180, and the driving synchronous pulley 172 and the driven synchronous pulley 173 are connected through a synchronous belt 174.

[0066] In summary, the head module involved in the present application realizes the quick change of the cutter module 10, and can drive the cutter module 10 to move up and down and rotate, and has a very good application prospect.

[0067] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A head module for a cutting machine, used for loading a cutting module (10), wherein a mounting protrusion (101) is fixedly provided on the outer wall of the cutting module (10), characterized in that: The head module comprises a base (20), a rotating sleeve (30) which can be moved up and down and rotatably mounted on the base (20), a quick-change mounting seat (40) which is threadedly screwed on the outer periphery of the upper end of the rotating sleeve (30), and a fixed limit pin (50) whose inner end is fixed to the rotating sleeve (30); the inner peripheral surface of the quick-change mounting seat (40) is provided with an internal thread and a circle of mounting grooves (41), the outer end of the fixed limit pin (50) is accommodated in the mounting groove (41), the upper groove wall and the lower groove wall of the mounting groove (41) respectively constitute a downward rotation limit surface (42) and an upward rotation limit surface (43), and the internal thread has a set zero position starting point; the upper end of the rotating sleeve (30) is provided with at least one internal insertion groove (31), the upper end of the quick-change mounting seat (40) is provided with at least one external insertion groove (44), and the lower end of the external insertion groove (44) extends to the mounting groove (41); When the quick-change mounting seat (40) is rotated to the unlocked position, the outer insertion slot (44) and the inner insertion slot (31) are aligned inside and outside, and the mounting protrusion (101) of the cutter module (10) is allowed to be inserted into the mounting slot (41) through the outer insertion slot (44) and the inner insertion slot (31), and the upward rotation limit surface (43) abuts against the lower end side of the fixed limit pin (50); When the quick-change mounting seat (40) is rotated to the locked position, the outer insertion slot (44) and the inner insertion slot (31) are circumferentially misaligned, and the downward rotation limit surface (42), the mounting protrusion (101) and the bottom of the inner insertion slot (31) are pressed against each other in sequence from top to bottom; the zero starting point of the internal thread makes the rotation angle of the quick-change mounting seat (40) from the unlocked position to the locked position and the rotation angle of the quick-change mounting seat (40) from the locked position to the unlocked position both be preset angles.

2. The head module for a cutting machine according to claim 1, characterized in that: The zero position starting point of the internal thread is located at the lower end of the external insertion groove (44).

3. The head module for a cutting machine according to claim 1, characterized in that: There are two inner insertion grooves (31) which are distributed at intervals of 180° along the circumference of the rotating sleeve (30), and there are two outer insertion grooves (44) which are distributed at intervals of 180° along the circumference of the quick-change mounting seat (40).

4. The head module for a cutting machine according to claim 1, characterized in that: A preload ring (60) is installed in the quick-change mounting seat (40). The preload ring (60) is distributed on the lower side of the mounting groove (41). The preload ring (60) is pressed between the rotating sleeve (30) and the quick-change mounting seat (40) along the radial direction of the rotating sleeve (30).

5. The head module for a cutting machine according to claim 1, characterized in that: The invention also comprises a lifting drive source (70) mounted on the base (20), a lifting seat (80) mounted on the base (20) movably up and down, a lifting transmission mechanism, a rotation drive source (90) mounted on the lifting seat (80), and a rotation transmission mechanism, wherein the lifting drive source (70) is transmission-connected to the lifting seat (80) via the lifting transmission mechanism, the rotating sleeve (30) is rotatably mounted in the lifting seat (80) via a first bearing (110), and the rotation drive source (90) is transmission-connected to the rotating sleeve (30) via the rotation transmission mechanism.

6. The head module for a cutting machine according to claim 5, characterized in that: The lifting drive source (70) is a motor, and the lifting transmission mechanism comprises a transmission screw (120) extending up and down, and a transmission nut threadedly matched with the transmission screw (120). The motor shaft of the lifting drive source (70) is connected to the upper end of the transmission screw (120) through a first coupling (130), the transmission screw (120) is rotatably mounted on the base (20) through a second bearing (140), and the transmission nut is fixedly connected to the lifting seat (80).

7. The head module for a cutting machine according to claim 6, characterized in that: It also includes a linear guide rail assembly (150) assembled between the base (20) and the lifting seat (80), wherein the linear guide rail in the linear guide rail assembly (150) is parallel to the transmission screw rod (120).

8. The head module for a cutting machine according to claim 5, characterized in that: The rotary drive source (90) is a motor, and the rotary transmission mechanism comprises a transmission shaft (171) rotatably supported in a lifting seat (80) via a third bearing (160), a driving synchronous pulley (172) fixed on the transmission shaft (171), a driven synchronous pulley (173) fixed on the outer periphery of a rotating sleeve (30), and a synchronous belt (174); the motor shaft of the rotary drive source (90) is connected to the upper end of the transmission shaft (171) via a second coupling (180), and the driving synchronous pulley (172) and the driven synchronous pulley (173) are connected via a synchronous belt (174).

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