CN210122659U

CN210122659U - High-precision garment cutting device

Info

Publication number: CN210122659U
Application number: CN201920725300.4U
Authority: CN
Inventors: 张安增
Original assignee: Hefei Donghua Garment Design Co Ltd
Current assignee: Hefei Donghua Garment Design Co Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-03-03
Anticipated expiration: 2029-05-20

Abstract

The utility model discloses a high-precision garment cutting device, which comprises a workbench, a cutter, a portal frame, an installation block, a first driving mechanism, a second driving mechanism and a cutter lifting cylinder; the cutter comprises a mounting frame, a mounting plate, a rotating shaft, a cutter head, a driven wheel, a cutting motor, a driving rod, a driving wheel and a belt, wherein the upper surface of the mounting frame is fixed with a piston rod of the cutter lifting cylinder; the belt is respectively tightly propped against the driving wheel and the driven wheel. The utility model discloses has following effect: the garment cutting machine reduces the influence of the working jitter of the cutting motor on the cutter head, and improves the precision of the garment cutting machine for cutting cloth.

Description

High-precision garment cutting device

Technical Field

The utility model relates to a clothing field of making, in particular to device is tailor to clothing of high accuracy.

Background

A garment cutting machine is a device commonly used in the field of garment manufacturing, and as shown in fig. 1, the garment cutting machine generally includes a workbench 1, a cutter 7 arranged on the workbench 1 and used for cutting garment cloth, a portal frame 2 arranged on the workbench 1, an installation block 3 arranged on the portal frame 2 and slidably connected with the portal frame 2, a first driving mechanism 4 arranged on the workbench 1 and used for driving the portal frame 2 to move, a second driving mechanism 5 arranged on the portal frame 2 and used for driving the installation block 3 to move, and a cutter lifting cylinder 6 arranged on the installation block 3 and used for vertically moving the cutter 7. When the clothes are cut, the cutter lifting cylinder 6 drives the cutter 7 to move downwards until the cutter 7 abuts against the cloth arranged on the workbench 1, then the first driving mechanism 4 and the second driving mechanism 5 work to drive the cutter 7 to move along a specified path, so that a fixed cut is cut on the cloth, and the cutting of the cloth is finished.

However, the cutter of the existing clothing cutting machine usually drives the cutter head to rotate by the cutting motor, so as to complete the cutting work of the cloth, but the cutting motor often generates certain shaking in the working process, so that the shaking of the cutter head is caused, the unevenness of the cut on the cloth is caused, and the precision of the clothing cutting machine for cutting the cloth is reduced.

Therefore, a high-precision garment cutting device is needed, the influence of the working jitter of the cutting motor on the cutter head is reduced, and the cloth cutting precision of the garment cutting machine is improved.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing a device is tailor to clothing of high accuracy, this machine is tailor to clothing has reduced the influence of cutting motor work shake to the tool bit, has reduced the shake of tool bit to the precision of machine cutting cloth is tailor to the clothing has been improved.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a high-precision garment cutting device comprises a workbench, a cutter, a portal frame, an installation block, a first driving mechanism, a second driving mechanism and a cutter lifting cylinder; the cutter comprises a mounting frame, a mounting plate, a rotating shaft, a cutter head, a driven wheel, a cutting motor, a driving rod, a driving wheel and a belt, wherein the upper surface of the mounting frame is fixed with a piston rod of the cutter lifting cylinder; the belt is respectively tightly propped against the driving wheel and the driven wheel.

Through adopting above-mentioned technical scheme, when the cutting motor during operation, it rotates to have driven the actuating lever, make the action wheel rotate, driven from the driving wheel rotation through the belt, driven axis of rotation and tool bit rotation, thereby the cloth has been cut, and the vibrations of cutting motor at the during operation are transmitted to the action wheel through the actuating lever on, the belt passes through friction drive with from driving wheel and action wheel, and the belt is flexible, the vibrations of transmitting on the action wheel to from driving wheel and tool bit have effectively been reduced, make the tool bit more level and more smooth to the incision of cloth, the precision of tailoring machine cutting cloth has been improved.

The utility model discloses further set up to, the action wheel and first race and second race have been seted up on the wheel face from the driving wheel respectively, the belt is close to the action wheel and from the driving wheel be fixed with on the surface respectively with the increase abrasive bar that first race and second race inner wall offset.

Through adopting above-mentioned technical scheme, the setting of increase abrasive strip, first race and second race compares with the belt is direct with the action wheel and follow the mode that the driving wheel offseted, has increased the area of contact of belt with the action wheel and follow the driving wheel, has strengthened the belt and the action wheel and has followed the friction between the driving wheel.

The utility model discloses further set up to, be fixed with on the action wheel two set up respectively in the first retaining ring of belt both sides.

Through adopting above-mentioned technical scheme, the part that the action wheel was walked around to the belt sets up between first retaining ring, has restricted the belt along the slip of action wheel axis direction, and the belt slips from the action wheel when preventing the action wheel vibrations.

The utility model discloses further set up to, be fixed with two from the driving wheel respectively set up in the second retaining ring of belt both sides.

Through adopting above-mentioned technical scheme, the part that the belt was walked around from the driving wheel sets up between the second retainer, has restricted the belt along the slip from driving wheel axis direction, and the belt slips from the driving wheel when preventing from shaking.

The utility model is further arranged in that the mounting frame is also provided with a mounting sleeve for mounting the cutting motor, the mounting sleeve is internally and slidably connected with a buffer block, and the cutting motor is arranged in the mounting sleeve and is fixed with the buffer block; the actuating lever include with the fixed telescopic link of cutting motor output shaft and level pass the installation cover and with the installation cover rotates the rotation loop bar of being connected, the telescopic link is kept away from the one end of cutting motor set up in rotate in the loop bar and with it sliding connection, it wears out to rotate the loop bar the one end of installation cover with the action wheel is fixed.

Through adopting above-mentioned technical scheme, when cutting motor along its output shaft direction vibrations, the buffer block slides for the installation cover, and the telescopic link that fixes with cutting motor output shaft this moment slides for rotating the cover, has cushioned the vibrations of cutting motor along its self output shaft direction.

The utility model discloses further set up to, the buffer block with the installation cover is close to be fixed with the bradyseism spring between the inside wall of action wheel.

Through adopting above-mentioned technical scheme, the setting of bradyseism spring has absorbed the kinetic energy when buffering the piece and has removed, has effectively cushioned cutting motor's vibrations.

The utility model discloses further set up to, the cover is equipped with and has elastic protective sheath on the bradyseism spring, the protective sheath both ends respectively with the buffer block is close to the lateral wall of actuating lever and the installation cover is close to the inside wall of action wheel is fixed.

Through adopting above-mentioned technical scheme, in debris such as external plush got into the clearance between the bradyseism spring, prevented that the bradyseism spring from becoming invalid effectively to the setting of protective sheath.

The utility model discloses further set up as, be equipped with bradyseism portion between the installation cover with the mounting bracket, bradyseism portion is including offering the bradyseism groove on the mounting bracket lateral wall, vertically set up in the shock attenuation board in the bradyseism groove, be fixed in the bradyseism groove and with the elastic ring that the shock attenuation flange edge offsets, the level passes the mounting bracket is kept away from the lateral wall of installation cover and with the mounting bracket clearance fit's erection column and set up in the mounting bracket keeps away from installation cover one side installation cover; the outer side wall of the mounting sleeve, which is close to the mounting frame, is fixed with the damping plate, and one end of the mounting column, which is close to the mounting sleeve, is fixed with the damping plate; the mounting cover sleeve is arranged on one end, far away from the damping plate, of the mounting column and is in threaded connection with the damping plate, and the mounting cover is far away from the mounting frame, and the side wall of the mounting sleeve is abutted.

Through adopting above-mentioned technical scheme, when cutting motor during operation, its vibrations along non-cutting motor output shaft axis direction pass through the buffer block and the installation cover transmits to the shock attenuation board on for the shock attenuation board vibrations, and the shock attenuation board offsets with the elastic ring that is fixed in the bradyseism inslot, has cushioned this part vibrations, has reduced the vibrations of cutting motor.

To sum up, the utility model discloses a beneficial technological effect does:

1. when the cutting motor works, the driving rod is driven to rotate, the driven wheel is driven to rotate through the belt, the rotating shaft and the cutter head are driven to rotate, so that cloth is cut, vibration of the cutting motor during working is transmitted to the driving wheel through the driving rod, the belt, the driven wheel and the driving wheel are in friction transmission, the belt is flexible, the vibration transmitted to the driven wheel and the cutter head on the driving wheel is effectively reduced, the cut of the cutter head on the cloth is smoother, and the cloth cutting precision of the clothes cutting machine is improved;

2. compared with the mode that the belt directly abuts against the driving wheel and the driven wheel, the arrangement of the friction increasing strips, the first wheel grooves and the second wheel grooves increases the contact area of the belt with the driving wheel and the driven wheel, and enhances the friction among the belt, the driving wheel and the driven wheel;

3. when the cutting motor shakes along its output shaft direction, the buffer block slides for the installation cover, and the telescopic link that is fixed with the cutting motor output shaft this moment slides for rotating the cover, has cushioned the vibrations of cutting motor along its own output shaft direction.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

FIG. 2 is a schematic view of the construction of the tool;

FIG. 3 is a schematic structural view of the driving wheel and the driven wheel;

FIG. 4 is a schematic structural view of the shock absorber.

In the figure: 1. a work table; 2. a gantry; 3. mounting blocks; 4. a first drive mechanism; 5. a second drive mechanism; 6. a cutter lifting cylinder; 7. a cutter; 71. a mounting frame; 72. mounting a plate; 73. a rotating shaft; 74. a cutter head; 75. a driven wheel; 751. a second wheel groove; 752. a second retainer ring; 76. a cushioning part; 761. a cushioning tank; 762. a damper plate; 763. an elastic ring; 764. mounting a column; 765. installing a cover; 766. an elastic sleeve; 77. a drive section; 771. installing a sleeve; 772. a buffer block; 773. cutting the motor; 774. a drive rod; 7741. rotating the loop bar; 7742. a telescopic rod; 775. a cushioning spring; 7751. a protective sleeve; 78. a driving wheel; 781. a first wheel groove; 782. a first retainer ring; 79. a belt; 791. and (4) polishing the strips.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, a high-precision garment cutting device comprises a workbench 1, a portal frame 2, a mounting block 3, a first driving mechanism 4, a second driving mechanism 5, a cutter lifting cylinder 6 and a cutter 7. Since the present embodiment is an improvement of the cutter 7 on the basis of the conventional garment cutting machine, the other parts than the cutter 7 will be described only briefly. The workbench 1 is arranged in the factory building, the length direction of the workbench is horizontal, and the table top of the workbench is horizontal and arranged upwards. The length direction of the portal frame 2 is horizontal and vertical to the length direction of the workbench 1, the portal frame is arranged on the workbench 1 and is in sliding connection with two sides of the workbench 1, and the sliding direction of the portal frame 2 is consistent with the length direction of the workbench 1. The mounting block 3 is arranged on the portal frame 2 and is connected with the portal frame 2 in a sliding manner, the sliding direction of the mounting block is consistent with the length direction of the portal frame 2, and the mounting block 3 is arranged on one side of the portal frame 2. The first driving mechanism 4 is a driving system of the existing clothing cutting machine, and is arranged on the workbench 1 and used for driving the portal frame 2 to move. The second driving mechanism 5 is also a driving system of the existing clothing cutting machine, and is arranged on the portal frame 2 and used for driving the mounting block 3 to move. The cutter lifting cylinder 6 is fixed on the side wall of the mounting block 3 far away from the portal frame 2, and a piston rod of the cutter lifting cylinder is arranged downwards and used for driving the cutter 7 to vertically move.

As shown in fig. 1 and 2, the cutter 7 includes a mounting frame 71, a mounting plate 72, a rotating shaft 73, a cutter head 74, a driven wheel 75, a cushioning portion 76, a driving portion 77, a driving wheel 78, and a belt 79. The mounting bracket 71 is a plate-shaped structure with a U-shaped vertical section, two ends of the mounting bracket face the direction away from the mounting block 3, and the upper surface of the mounting bracket 71 is fixed with the end part of the piston rod of the cutter lifting cylinder 6. The mounting plate 72 is a rectangular plate-shaped structure, and is vertically disposed at the bottom of the mounting bracket 71, and the upper surface of the mounting plate 72 is fixed to the bottom surface of the mounting bracket 71. The rotating shaft 73 is a shaft-like structure having a circular cross section, and horizontally penetrates the mounting plate 72 and is rotatably connected thereto. The cutter head 74 has a circular plate-like structure, and the center of the circular surface thereof is fixed to one end of the rotary shaft 73. As shown in fig. 3, the driven wheel 75 is a circular wheel-shaped structure, the axis of which coincides with the axis of the rotating shaft 73, and is disposed on the side of the mounting plate 72 away from the cutter head 74 and fixed to the end of the rotating shaft 73 away from the cutter head 74. A second wheel groove 751 is formed in the wheel surface of the driven wheel 75, the second wheel groove 751 is an annular groove and extends around the axis of the driven wheel 75, and the section of the second wheel groove 751 is V-shaped. The driven wheel 75 is further sleeved with a second retaining ring 752, the second retaining ring 752 is a circular ring-shaped sheet-shaped structure, and is sleeved on the driven wheel 75 and fixed to the wheel surface of the driven wheel, two second retaining rings 752 are provided, and the two second retaining rings 752 are respectively provided at two ends of the driven wheel 75.

As shown in fig. 2 and 4, the cushioning portion 76 includes a cushioning groove 761, a cushioning plate 762, an elastic ring 763, a mounting post 764, and a mounting cover 765. The damping slot 761 is opened on a side wall of the mounting bracket 71 away from the mounting block 3, and has a rectangular opening. The elastic ring 763 is a rectangular frame-shaped structure, is made of elastic rubber, and is disposed in the damping groove 761, and an outer wall of the elastic ring 763 is fixed to an inner wall of the damping groove 761. The damping plate 762 is a rectangular plate structure, and is vertically disposed in the damping slot 761 and located in the elastic ring 763, and the damping plate 762 abuts against an inner wall of the elastic ring 763. Mounting post 764 is circular columnar structure, and its axis is perpendicular with shock attenuation board 762, and mounting post 764 passes mounting bracket 71 and is close to the lateral wall of installing piece 3 and fixed with the lateral wall that shock attenuation board 762 is located the bradyseism groove 761, and mounting post 764 and mounting bracket 71 clearance fit. The mounting post 764 is sleeved with an elastic sleeve 766, the elastic sleeve 766 is in a shape of a circular tube and is made of elastic rubber materials, the inner wall of the elastic sleeve is abutted to the mounting post 764, and the outer wall of the elastic sleeve 766 is fixed with the mounting frame 71 through the inner wall of a hole of the mounting post 764. The mounting cap 765 is a circular cap-shaped structure, and is sleeved on one end of the mounting post 764 penetrating through the mounting bracket 71 and in threaded connection with the mounting post, and when the mounting cap 765 is screwed, the open end surface of the mounting cap 765 abuts against the side wall of the mounting bracket 71 penetrating through the mounting post 764.

As shown in fig. 2, the driving part 77 includes a mounting sleeve 771, a bumper 772, a cutting motor 773, a driving rod 774, and a shock-absorbing spring 775. The mounting sleeve 771 is a sleeve-shaped structure with a rectangular opening section, the length direction of the mounting sleeve 771 is horizontal, the mounting sleeve 771 is arranged on one side of the mounting frame 71 close to the cushioning groove 761, and the mounting sleeve 771 is close to the outer side wall of the mounting frame 71 and the surface of the damping plate 762 close to the outer opening of the cushioning groove 761 to be fixed. In addition, one end of the mounting sleeve 771 is open and the other end is closed, the open end of the mounting sleeve 771 faces the outside of the mounting rack 71, and the closed end faces the inside of the mounting rack 71. The buffer block 772 is a rectangular block structure, which is disposed in the mounting sleeve 771 and slidably connected to the inner wall of the mounting sleeve 771, and the sliding direction of the buffer block 772 is consistent with the length direction of the mounting sleeve 771. The cutting motor 773 is disposed in the mounting pocket 771 and located at one end of the opening of the mounting pocket 771, the cutting motor 773 is fixed on the side wall of the bumper 772 near the opening of the mounting pocket 771, and the output shaft of the cutting motor 773 penetrates through the side wall of the bumper 772 near the closed end of the mounting pocket 771. The driving rod 774 includes a rotating sleeve 7741 and a telescopic rod 7742, the rotating sleeve 7741 is a round rod-shaped structure, the interior of the rotating sleeve 7741 is hollow, one end of the rotating sleeve is closed, and the other end is open, and in addition, the cross section of the inner wall of the rotating sleeve 7741 is square. The length direction of the rotating sleeve bar 7741 is the same as that of the mounting sleeve 771, the rotating sleeve bar 7741 penetrates through the end face of the closed end of the mounting sleeve 771 and is rotatably connected with the mounting sleeve 771, and one end of the opening of the rotating sleeve bar 7741 is arranged in the mounting sleeve 771. The expansion link 7742 is a rod-shaped structure with a square cross section, one end of which is fixed with the output shaft of the cutting motor 773, and the other end of which is arranged in the rotating sleeve 7741 and is connected with the inner wall of the rotating sleeve 7741 in a sliding way. The damping spring 775 is sleeved on the driving rod 774, one end of the damping spring 775 is fixed with the side wall of the buffer block 772 close to the driving rod 774, the other end of the damping spring 775 is fixed with the inner side wall of the closed end of the mounting sleeve 771, and when the cutting motor 773 stops working, the damping spring 775 is in a natural extension state. The shock-absorbing spring 775 is sleeved with a protective sleeve 7751, the protective sleeve 7751 is in a circular tube shape and made of elastic rubber materials, and two ends of the protective sleeve 775 are respectively fixed with the side wall of the buffer block 772 close to the driving rod 774 and the inner side wall of the closed end of the mounting sleeve 771.

As shown in fig. 2 and 3, the driving wheel 78 is disposed at one end of the mounting sleeve 771 near the driving rod 774, the driving wheel 78 is in a circular wheel shape, the axis of the driving wheel 78 coincides with the axis of the rotating sleeve 7741, and the end surface of the driving wheel 78 near the mounting sleeve 771 is fixed to one end of the rotating sleeve 7741 penetrating through the mounting sleeve 771. First race 781 has been seted up on the wheel face of action wheel 78, and first race 781 is the ring channel, and its axis that encircles action wheel 78 extends, and the cross-section of first race 781 is the V-arrangement. Still be equipped with first retaining ring 782 on the action wheel 78, first retaining ring 782 is ring shape sheet structure, and it is fixed on the action wheel 78 and with its wheel face that the cover is located, and first retaining ring 782 is equipped with two altogether, and two first retaining rings 782 set up respectively in action wheel 78 both ends. The belt 79 is a belt-shaped structure, both ends of which are closed, and the belt 79 respectively passes around the wheel surfaces of the driving wheel 78 and the driven wheel 75 and abuts against the wheel surfaces of the driving wheel 78 and the driven wheel 75. In addition, the belt 79 is provided with a polishing strip 791, the polishing strip 791 is fixed on the surface of the belt 79 close to the driving wheel 78, the cross section of the polishing strip 791 is triangular, the polishing strip 791 extends along the belt body of the belt 79, and the polishing strip 791 bypasses the first wheel groove 781 and the second wheel groove 751 and is abutted against the inner walls of the first wheel groove 781 and the second wheel groove 751 respectively.

This embodiment is when using, cutting motor 773 work, it rotates to have driven actuating lever 774, make action wheel 78 rotate, driven 75 rotations from the driving wheel has been driven through belt 79, driven axis of rotation 73 and tool bit 74 rotate, thereby the cloth has been cut, and cutting motor 773 passes through actuating lever 774 and transmits to action wheel 78 in the vibrations at the during operation, belt 79 passes through friction drive with from driving wheel 75 and action wheel 78, and belt 79 is flexible, the vibrations of transmitting on driven wheel 75 and the tool bit 74 on the action wheel 78 have effectively been reduced, make tool bit 74 more level and more smooth to the incision of cloth, the precision of clothing cutting machine cutting cloth has been improved.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a device is tailor to clothing of high accuracy, includes workstation (1), cutter (7), portal frame (2), installation piece (3), first actuating mechanism (4), second actuating mechanism (5) and lift sword cylinder (6), characterized by: the cutter (7) comprises an installation frame (71) with the upper surface fixed with a piston rod of the cutter lifting cylinder (6), an installation plate (72) fixed on the bottom surface of the installation frame (71), a rotating shaft (73) horizontally penetrating through the installation plate (72) and rotatably connected with the same, a cutter head (74) fixed at one end of the rotating shaft (73), a driven wheel (75) fixed at the other end of the rotating shaft (73), a cutting motor (773) arranged on the installation frame (71), a driving rod (774) fixed on an output shaft of the cutting motor (773), a driving wheel (78) fixed at one end, far away from the cutting motor (773), of the driving rod (774), and a belt (79) respectively bypassing the driven wheel (75) and the driving wheel (78); the belt (79) is respectively tightly abutted against the driving wheel (78) and the driven wheel (75).

2. The high precision garment cutting apparatus of claim 1, wherein: the wheel surfaces of the driving wheel (78) and the driven wheel (75) are respectively provided with a first wheel groove (781) and a second wheel groove (751), and the surface of the belt (79) close to the driving wheel (78) and the driven wheel (75) is fixedly provided with a polishing strip (791) which is respectively abutted against the inner walls of the first wheel groove (781) and the second wheel groove (751).

3. The high precision garment cutting apparatus of claim 2, wherein: two first check rings (782) which are respectively arranged on two sides of the belt (79) are fixed on the driving wheel (78).

4. The high precision garment cutting apparatus of claim 2, wherein: two second retainer rings (752) respectively arranged at two sides of the belt (79) are fixed on the driven wheel (75).

5. The high precision garment cutting apparatus of claim 1, wherein: the mounting rack (71) is further provided with a mounting sleeve (771) for mounting the cutting motor (773), a buffer block (772) is connected in the mounting sleeve (771) in a sliding mode, and the cutting motor (773) is arranged in the mounting sleeve (771) and fixed with the buffer block (772); the drive rod (774) include with fixed telescopic link (7742) of cutting motor (773) output shaft and level pass installation cover (771) and with rotation loop bar (7741) of rotating connection of installation cover (771), telescopic link (7742) keep away from the one end of cutting motor (773) set up in rotate loop bar (7741) and sliding connection with it, rotate loop bar (7741) wear out the one end of installation cover (771) with the action wheel (78) are fixed.

6. The high precision garment cutting apparatus of claim 5, wherein: and a cushioning spring (775) is fixed between the buffer block (772) and the inner side wall of the mounting sleeve (771) close to the driving wheel (78).

7. The high precision garment cutting apparatus of claim 6, wherein: the shock absorption spring (775) is sleeved with an elastic protective sleeve (7751), two ends of the protective sleeve (7751) are respectively close to the side wall of the driving rod (774) and the installation sleeve (771) is close to the inner side wall of the driving wheel (78).

8. The high precision garment cutting apparatus of claim 5, wherein: a cushioning part (76) is arranged between the mounting sleeve (771) and the mounting frame (71), the cushioning part (76) comprises a cushioning groove (761) arranged on the side wall of the mounting frame (71), a damping plate (762) vertically arranged in the cushioning groove (761), an elastic ring (763) fixed in the cushioning groove (761) and abutted against the edge of the damping plate (762), a mounting column (764) horizontally penetrating through the side wall of the mounting frame (71) far away from the mounting sleeve (771) and in clearance fit with the mounting frame (71), and a mounting cover (765) arranged on one side of the mounting frame (71) far away from the mounting sleeve (771); the mounting sleeve (771) is fixed with the damping plate (762) close to the outer side wall of the mounting frame (71), and one end of the mounting column (764) close to the mounting sleeve (771) is fixed with the damping plate (762); the mounting cover (765) is sleeved on one end, far away from the damping plate (762), of the mounting column (764) and in threaded connection with the mounting column, and the mounting cover (765) abuts against the side wall, far away from the mounting sleeve (771), of the mounting rack (71).