CN218551544U - Automatic head wrapping machine for processing polyester shoelaces - Google Patents

Abstract

The utility model relates to the technical field of shoelace processing, in particular to an automatic toe-wrapping machine for processing terylene shoelaces, which does not need a thread feeding device moving in a reciprocating way, has few moving parts and simple structure; the film packaging machine comprises a rack, a film conveyer, a head wrapping mold and a bobbin, wherein the film conveyer, the head wrapping mold and the bobbin are all arranged on the rack; still include the reason line ware, the bearing frame, the pendulum rod, two trapping mechanism poles, intermittent type mechanism and drive mechanism, the reason line ware is installed in the frame, the reason line ware is located the inboard of spool, the bearing frame is located the offside frame of baotou mould, the middle part of pendulum rod is rotated through pivot and bearing frame and is connected, intermittent type mechanism installs the lower part in the frame, intermittent type mechanism passes through drive mechanism and is connected with the pivot transmission of pendulum rod, the both sides at the pendulum rod are installed to two trapping mechanism pole symmetries, all be provided with shoelace centre gripping subassembly on two trapping mechanism poles, the deflector is installed in the frame, the deflector is located the one side of keeping away from the reason line ware, deflector and the centre gripping subassembly direction sliding contact of trapping mechanism pole.

Description

Automatic wrapping head machine is used in processing of dacron shoelace

Technical Field

The utility model relates to a technical field of shoelace processing especially relates to a dacron shoelace processing is with automatic baotou machine.

Background

In order to conveniently insert the polyester shoelace into a shoelace hole of the shoe and simultaneously avoid loose and off-line of the end head of the polyester shoelace, the two end heads of the polyester shoelace are required to be wrapped with a plastic wrapping head, a metal wrapping head and a hot melting wrapping head, wherein the plastic wrapping head is mostly applied, a feed wrapping head machine of the polyester shoelace generally comprises a frame, a film feeding mechanism, a wrapping head mold, a wire feeding mechanism, a controller and the like, wherein the film feeding mechanism and the wrapping head mold are mature prior art, the film feeding mechanism and the wrapping head mold can automatically run, when the automatic wire feeding mechanism is adopted, the automatic wrapping head work of the polyester shoelace can be realized, the existing automatic wire feeding mechanism is provided with a long shaft, a spinning-car-shaped wire clamp is arranged on the long shaft, the spinning-car-shaped wire clamp intermittently rotates, the film feeding mechanism feeds the film into the wrapping head mold, the wrapping head mold clamps the middle part of the polyester shoelace to cut off the wrapping head, the wire clamp the middle part of the spinning-car-shaped wire clamp, and the reciprocating motion of the polyester shoelace is realized.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a need not reciprocating motion's last thread ware, moving part is few, simple structure's automatic baotou machine is used in processing of dacron shoelace.

The utility model discloses an automatic toe-wrapping machine for processing terylene shoelaces, which comprises a frame, a film conveyor, a toe-wrapping mold and a bobbin, wherein the lower part of the frame is provided with a plurality of supporting legs, the film conveyor is arranged at the lower part of the frame, the toe-wrapping mold is arranged at the middle part of the frame, and the bobbin is arranged at one end of the frame; the automatic winding mechanism comprises a winding mechanism, a bearing seat, a swing rod, two wire clamping rods, an intermittent mechanism and a transmission mechanism, wherein the winding mechanism is arranged on a rack and is positioned on the inner side of a bobbin; the method comprises the steps of adjusting a swing rod to be in a horizontal state, loading a reel of a shoelace line onto a spool, drawing out a shoelace end and threading the shoelace end around a wire arranging device, clamping the shoelace end on a clamping component of a wire clamping rod, starting equipment, operating an intermittent mechanism, driving the swing rod to rotate 180 degrees intermittently by the intermittent mechanism through a transmission mechanism, enabling the wire clamping rod close to the wire arranging device to rotate to one side away from the wire arranging device through the upper side of a packet head die, enabling the clamping component of another wire clamping rod to hold the shoelace line from bottom to top, placing the shoelace line between the two wire clamping rods into the packet head die at the moment, operating a film conveyor and the packet head die, feeding the film into the packet head die by the film conveyor, enabling the packet head die to scald the film to wrap the shoelace and cut off the shoelace, rotating the swing rod for 180 degrees again after the shoelace is cut off, performing next packet head processing, opening the clamping component on the wire clamping rod far away from the wire arranging device by a guide plate in the process, enabling the cut off shoelace to fall into a collecting basket, and achieving automatic processing of the dacron shoelace without the threading device, few moving parts and having a simple structure.

Preferably, the wire clamping rod comprises a stay bar, a fixed round head, a slide bar, a movable round head, a spring and a circular plate, long chutes are formed in the left side and the right side of the swing bar, the outer end of the stay bar is slidably mounted in the long chute of the swing bar, the fixed round head is concentrically mounted at the inner end of the stay bar, concentric slide holes are formed in the stay bar and the fixed round head, a plurality of guide grooves are uniformly formed in the outer wall of the stay bar, the outer part of the slide bar is slidably mounted in the slide holes, the movable round head is concentrically mounted at the inner end of the slide bar, the movable round head and the fixed round head are concentrically aligned, a plurality of sliders and circular rings are arranged at the outer end of the slide bar, the plurality of sliders of the slide bar are respectively slidably connected with the plurality of guide grooves of the stay bar, the spring is sleeved on the stay bar, one end of the spring is connected with the circular ring of the slide bar, the other end of the spring is connected with the fixed round head, the circular plate is concentrically mounted on the outer end face of the movable round head through a short bar, and the inner end face of the circular plate is in sliding contact with the guide plate; the position of two vaulting poles is removed along two long spouts of pendulum rod, thereby adjust the length of finished product shoelace, the ring and the slider that the elasticity effect of spring passes through the slide bar promote the slide bar to slide to the outer end of the slide opening of vaulting pole, make and move the button head and compress tightly on deciding the circle head, thereby make and make the button head live with deciding the button head and clamp the shoelace, when the pendulum rod drives two vaulting pole rotations, the interior terminal surface of plectane and the lateral wall sliding contact of deflector, make the deflector inwards promote the plectane, the plectane will move button head and slide bar and inwards stimulate, thereby make and make the button head break away from with deciding the button head, the shoelace that cuts off falls in the collection basket of external world, realize automatic double-layered line and unwrapping wire, and improve work efficiency.

Preferably, the device also comprises a plurality of pattern grooves, and a plurality of pattern grooves are arranged on the opposite end surfaces of the two fixed round heads and the two movable round heads; through setting up a plurality of checkered grooves, improve two and decide the frictional force between button head and two movable button heads, improve the stability of sending the line to press from both sides the line.

Preferably, the adjusting device further comprises two screws and an adjusting frame, one ends of the two screws are connected with the guide plate, one end of the adjusting frame is mounted on the rack, the other end of the adjusting frame is provided with a long mounting hole, the two screws penetrate through the long mounting hole of the adjusting frame, and the two screws are locked on the adjusting frame through a plurality of nuts; the height of two screw rods is adjusted from top to bottom along the long mounting hole of adjustment frame, controls the position of two screw rods simultaneously to through a plurality of nut locks, thereby when making vaulting pole adjusting position, the deflector still can cooperate with the plectane, with the finished product shoelace that adapts to different length, improve equipment's commonality.

Preferably, the wire arranging device comprises a wire arranging frame, a fixed wire arranging roller and a movable wire arranging roller, the wire arranging frame is installed on the rack and is positioned on the inner side of the wire shaft, the left side and the right side of the wire arranging frame are both provided with adjusting slotted holes, the fixed wire arranging roller is rotatably installed in the wire arranging frame, and the rotating shaft of the movable wire arranging roller is installed in the two adjusting slotted holes of the wire arranging frame; the shoelace threads are drawn out from the shoelace thread spool, the shoelace threads are wound around the theorem thread roller and the mobile thread roller, the fixed round head and the mobile round head are clamped, the mobile thread roller is moved along the adjusting slotted hole of the thread management frame, the interval between the theorem thread roller and the mobile thread roller is changed, the resistance to the shoelace threads is changed, the theorem thread roller and the mobile thread roller perform thread management and damping tensioning on the shoelace threads, the shoelace threads are in a stretched straight state when the shoelace threads are wrapped, and the quality of wrapping heads is improved.

Preferably, the intermittent mechanism comprises a speed reduction motor, a swing arm, a gear box and a special-shaped wheel, the speed reduction motor is installed on the rack through a support, the swing arm is installed on an output shaft of the speed reduction motor, a shifting rod is arranged on the swing arm, the gear box is installed on the rack through a support, the special-shaped wheel is installed on an input shaft of the gear box, a plurality of shifting grooves are uniformly formed in the special-shaped wheel, the plurality of shifting grooves are radially and circularly arranged, the shifting rod of the swing arm is in sliding connection with the shifting grooves of the special-shaped wheel, and the output shaft of the gear box is in transmission connection with a rotating shaft of the swing rod through a transmission mechanism; gear motor drive swing arm rotates, and after the driving lever of swing arm got into the groove of dialling of special-shaped wheel, the driving lever of swing arm stirred certain angle with the special-shaped wheel with the cooperation of the groove of dialling of special-shaped wheel for special-shaped wheel intermittent type nature rotates, and special-shaped wheel drive gear box operation, the same intermittent type nature of the output shaft of gear box rotates, selects suitable gear ratio, makes the output shaft of gear box rotate 180 degrees at every turn, thereby realizes that the intermittent type nature 180 degrees of pendulum rod rotate improve equipment's practicality.

Preferably, the transmission mechanism comprises two chain wheels and a chain, the two chain wheels are respectively concentrically arranged on the output shaft of the gear box and the rotating shaft of the oscillating bar, and the chain is sleeved on the two chain wheels; the output shaft of the gear box drives the chain wheel on the gear box to rotate for 180 degrees intermittently, the chain wheel drives the other chain wheel to rotate through the chain, so that the swing rod is driven to rotate for 180 degrees intermittently, and the shoelace wrapping die finishes shoelace wrapping and cutting off in the rotating gap of the swing rod.

Compared with the prior art, the beneficial effects of the utility model are that: the method comprises the steps of adjusting a swing rod to be in a horizontal state, loading a reel of a shoelace line onto a spool, drawing out a shoelace end and threading the shoelace end around a wire arranging device, clamping the shoelace end on a clamping component of a wire clamping rod, starting equipment, operating an intermittent mechanism, driving the swing rod to rotate 180 degrees intermittently by the intermittent mechanism through a transmission mechanism, enabling the wire clamping rod close to the wire arranging device to rotate to one side away from the wire arranging device through the upper side of a packet head die, enabling the clamping component of another wire clamping rod to hold the shoelace line from bottom to top, placing the shoelace line between the two wire clamping rods into the packet head die at the moment, operating a film conveyor and the packet head die, feeding the film into the packet head die by the film conveyor, enabling the packet head die to scald the film to wrap the shoelace and cut off the shoelace, rotating the swing rod for 180 degrees again after the shoelace is cut off, performing next packet head processing, opening the clamping component on the wire clamping rod far away from the wire arranging device by a guide plate in the process, enabling the cut off shoelace to fall into a collecting basket, and achieving automatic processing of the dacron shoelace without the threading device, few moving parts and having a simple structure.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic top view of the present invention;

FIG. 3 is an exploded and enlarged view of the structure of the swing link, the thread clamping rod, the guide plate, etc.;

FIG. 4 is a schematic view of a partial enlarged structure at A;

in the drawings, the reference numbers: 1. a frame; 2. a film conveyor; 3. a wrapping head mould; 4. a bobbin; 5. arranging a wire device; 6. a bearing seat; 7. a swing rod; 8. a wire clamping rod; 9. a guide plate; 10. a stay bar; 11. fixing a round head; 12. a slide bar; 13. moving the round head; 14. a spring; 15. a circular plate; 16. pattern grooves; 17. a screw; 18. an adjusting frame; 19. a wire arranging frame; 20. a theorem wire roller; 21. moving a wire arranging roller; 22. a reduction motor; 23. swinging arms; 24. a gear case; 25. a special-shaped wheel; 26. a sprocket; 27. a chain.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

The wire clamping rod 8 comprises a stay bar 10, a fixed round head 11, a sliding bar 12, a movable round head 13, a spring 14 and a circular plate 15, long sliding grooves are formed in the left side and the right side of the swinging bar 7, the outer end of the stay bar 10 is slidably installed in the long sliding grooves of the swinging bar 7, the fixed round head 11 is concentrically installed at the inner end of the stay bar 10, concentric sliding holes are formed in the stay bar 10 and the fixed round head 11, a plurality of guide grooves are uniformly formed in the outer wall of the stay bar 10, the outer portion of the sliding bar 12 is slidably installed in the sliding holes, the movable round head 13 is concentrically installed at the inner end of the sliding bar 12, the movable round head 13 is concentrically aligned with the fixed round head 11, a plurality of sliders and circular rings are arranged at the outer end of the sliding bar 12, the sliders of the sliding bar 12 are respectively slidably connected with the guide grooves of the stay bar 10, the spring 14 is sleeved on the stay bar 10, one end of the spring 14 is connected with the circular ring of the sliding bar 12, the other end of the fixed round head 11 is concentrically aligned with the movable round head 13, the circular plate 15 is concentrically installed on the inner end face of the circular plate 13 through a short bar, and the circular plate 15 is slidably contacted with the guide plate 9; the length of shoelace is the same with the distance between two vaulting poles 10, move the position of two vaulting poles 10 along two long spouts of pendulum rod 7, thereby the length of adjustment finished product shoelace, after changing new shoelace line reel, with the manual card of the end of shoelace line between movable button head 13 and fixed button head 11, the starting equipment, pendulum rod 7 drives two vaulting poles 10 and rotates, movable button head 13 and fixed button head 11 cooperate the automatic straight shoelace line that clamps of clamping after the equipment operation, accomplish the baotou operation when film conveyer 2 and baotou mould 3 cooperation, the interior terminal surface of the plectane 15 that is located the opposite side of reason line ware 5 and the lateral wall sliding contact of deflector 9, make deflector 9 promote plectane 15 inwards, plectane 15 will move button head 13 and slide bar 12 and inwards pull, thereby make movable button head 13 break away from with fixed button head 11, the shoelace that cuts off falls in the collection basket of external world, take out first shoelace, the one end of this shoes is not carried out, realize automatic baotou and unwrapping.

Example 2

The intermittent mechanism comprises a speed reducing motor 22, a swing arm 23, a gear box 24 and a special-shaped wheel 25, the speed reducing motor 22 is mounted on the rack 1 through a support, the swing arm 23 is mounted on an output shaft of the speed reducing motor 22, a deflector rod is arranged on the swing arm 23, the gear box 24 is mounted on the rack 1 through a support, the special-shaped wheel 25 is mounted on an input shaft of the gear box 24, a plurality of deflector grooves are uniformly formed in the special-shaped wheel 25, the deflector rods of the swing arm 23 are in radial circular arrangement, the deflector rods of the swing arm 23 are in sliding connection with the deflector grooves of the special-shaped wheel 25, and the output shaft of the gear box 24 is in transmission connection with a rotating shaft of the swing rod 7 through a transmission mechanism; the speed reduction motor 22 drives the swing arm 23 to rotate, after a shifting rod of the swing arm 23 enters a shifting groove of the special-shaped wheel 25, the shifting rod of the swing arm 23 is matched with the shifting groove of the special-shaped wheel 25 to shift the special-shaped wheel 25 by a certain angle, so that the special-shaped wheel 25 intermittently rotates, the special-shaped wheel 25 drives the gear box 24 to operate, an output shaft of the gear box 24 also intermittently rotates, and a proper gear ratio is selected, for example, the special-shaped wheel 25 is provided with four shifting grooves, the swing arm 23 rotates for a circle to shift the special-shaped wheel 25 to rotate for 90 degrees, the gear ratio of an output gear to an input gear in the gear box 24 is an integral multiple of 2 and is an acceleration gear ratio, so that the gear ratio of the output gear to the input gear is preferably 2, and the output shaft of the gear box 24 rotates for 180 degrees every time.

As shown in fig. 1 to 4, the automatic toe covering machine for processing the polyester shoelace of the present invention, when in operation, firstly adjusts the swing rod 7 to a horizontal state, loads the spool of the shoelace cord on the spool 4, draws out the shoelace end and bypasses the fixed and movable shoelace-arranging rollers 20 and 21, clamps the shoelace end between the fixed and movable circular heads 11 and 13, then starts the device, the gear motor 22 drives the swing arm 23 to rotate, the shift lever of the swing arm 23 cooperates with the shift groove of the special-shaped wheel 25 to shift the special-shaped wheel 25 by a certain angle, so that the special-shaped wheel 25 intermittently rotates, the special-shaped wheel 25 drives the gear box 24 to operate, the output shaft of the gear box 24 rotates 180 degrees each time, the gear box 24 drives the swing rod 7 to intermittently rotate 180 degrees through the two chain wheels 26 and the chain 27, then, the stay rod 10 close to the wire arranging device 5 is made to rotate to one side departing from the wire arranging device 5 through the upper side of the toe cap die 3, the fixed round head 11 and the movable round head 13 on the other stay rod 10 clamp shoelaces from bottom to top, at the moment, the shoelace wires between the two wire clamping rods 8 are placed in the toe cap die 3, the film conveyor 2 and the toe cap die 3 operate, the film conveyor 2 sends films into the toe cap die 3, the toe cap die 3 scalds and wraps the shoelaces with the films and cuts off the shoelaces, after the shoelaces are cut off, the swing rod 7 rotates 180 degrees again to perform next processing, and finally, in the process, the circular plate 15 and the movable round head 13 far away from the wire arranging device 5 are pushed inwards by the guide plate 9 to enable the movable round head 13 and the fixed round head 11 to be opened, and the cut shoelaces fall into the collecting basket.

The utility model discloses the main function who realizes does: the device does not need a thread feeding device which moves in a reciprocating manner, has few moving parts and a simple structure, and realizes the automatic processing of the package head of the terylene shoelace.

The installation mode, the connection mode or the setting mode of the automatic head wrapping machine for processing the polyester shoelace of the utility model are common mechanical modes, and the automatic head wrapping machine can be implemented as long as the beneficial effects can be achieved; the utility model discloses a frame 1, film conveyer 2, baotou mould 3, spool 4, gear motor 22, swing arm 23, gear box 24, special-shaped wheel 25, sprocket 26, chain 27, bearing frame 6, theorem line roller 20, move reason line roller 21, spring 14, screw rod 17 of automatic baotou machine are used in processing of dacron shoelace for purchase on the market, this industry technical staff only need according to its subsidiary service instruction install and operate can, and need not the technical staff in this field and pay out creative work.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. An automatic shoe covering machine for processing polyester shoelaces comprises a rack (1), a film conveyor (2), a shoe covering mold (3) and a bobbin (4), wherein a plurality of supporting legs are arranged at the lower part of the rack (1), the film conveyor (2) is installed at the lower part of the rack (1), the shoe covering mold (3) is installed in the middle of the rack (1), and the bobbin (4) is installed at one end of the rack (1); the shoe lace clamping device is characterized by further comprising a wire arranging device (5), a bearing seat (6), a swing rod (7), two wire clamping rods (8), an intermittent mechanism and a transmission mechanism, the wire arranging device (5) is installed on the rack (1), the wire arranging device (5) is located on the inner side of a bobbin (4), the bearing seat (6) is installed in the middle of the rack (1), the bearing seat (6) is located on the opposite side of the ferrule die (3), the middle of the swing rod (7) is rotatably connected with the bearing seat (6) through a rotating shaft, the intermittent mechanism is installed on the lower portion of the rack (1), the intermittent mechanism is in transmission connection with the rotating shaft of the swing rod (7) through the transmission mechanism, the two wire clamping rods (8) are symmetrically installed on two sides of the swing rod (7), lace clamping assemblies are arranged on the two wire clamping rods (8), a guide plate (9) is installed on the rack (1), the guide plate (9) is located on one side far away from the wire arranging device (5), and the guide plate (9) is in sliding contact with the clamping assemblies of the wire clamping rods (8).

2. The automatic toe covering machine for the dacron shoelace processing as claimed in claim 1, wherein the thread clamping rod (8) comprises a stay bar (10), a fixed round head (11), a sliding bar (12), a movable round head (13), a spring (14) and a circular plate (15), long sliding grooves are formed on the left and right sides of the swing bar (7), the outer end of the stay bar (10) is slidably mounted in the long sliding grooves of the swing bar (7), the inner end of the stay bar (10) is concentrically provided with a fixed round head (11), the stay bar (10) and the fixed round head (11) are provided with concentric sliding holes, the outer wall of the stay bar (10) is uniformly provided with a plurality of guide grooves, the outer part of the slide bar (12) is slidably arranged in the sliding holes, the inner end of the sliding rod (12) is concentrically provided with a movable round head (13), the movable round head (13) is concentrically aligned with the fixed round head (11), the outer end of the sliding rod (12) is provided with a plurality of sliding blocks and a circular ring, the sliding blocks of the sliding rod (12) are respectively in sliding connection with a plurality of guide grooves of the stay bar (10), the spring (14) is sleeved on the stay bar (10), one end of the spring (14) is connected with the circular ring of the sliding rod (12), the other end of the spring (14) is connected with the fixed round head (11), the circular plate (15) is concentrically arranged on the outer end face of the movable round head (13) through a short rod, and the inner end face of the circular plate (15) is in sliding contact with the guide plate (9).

3. The automatic toe-covering machine for the polyester shoelace processing as claimed in claim 2, further comprising a plurality of lug grooves (16), wherein the opposite end surfaces of the two fixed round heads (11) and the two movable round heads (13) are provided with a plurality of lug grooves (16).

4. The automatic shoe covering machine for the polyester shoelace processing as claimed in claim 1, further comprising two screws (17) and an adjusting frame (18), wherein one ends of the two screws (17) are connected with the guide plate (9), one end of the adjusting frame (18) is mounted on the frame (1), the other end of the adjusting frame (18) is provided with a long mounting hole, both screws (17) pass through the long mounting hole of the adjusting frame (18), and a plurality of nuts lock the two screws (17) on the adjusting frame (18).

5. The automatic toe covering machine for the polyester shoelace processing as claimed in claim 1, wherein the wire arranging device (5) comprises a wire arranging frame (19), a wire arranging fixed roller (20) and a wire arranging movable roller (21), the wire arranging frame (19) is mounted on the frame (1), the wire arranging frame (19) is located on the inner side of the spool (4), the left side and the right side of the wire arranging frame (19) are respectively provided with an adjusting slotted hole, the wire arranging fixed roller (20) is rotatably mounted in the wire arranging frame (19), and a rotating shaft of the wire arranging movable roller (21) is mounted in the two adjusting slotted holes of the wire arranging fixed frame (19).

6. The automatic shoe covering machine for the polyester shoelace processing as claimed in claim 1, wherein the intermittent mechanism comprises a reduction motor (22), a swing arm (23), a gear box (24) and a special-shaped wheel (25), the reduction motor (22) is mounted on the frame (1) through a bracket, the swing arm (23) is mounted on an output shaft of the reduction motor (22), the swing arm (23) is provided with a shift lever, the gear box (24) is mounted on the frame (1) through a bracket, the special-shaped wheel (25) is mounted on an input shaft of the gear box (24), the special-shaped wheel (25) is uniformly provided with a plurality of shift grooves, the shift grooves are radially and circularly arranged, the shift lever of the swing arm (23) is in sliding connection with the shift groove of the special-shaped wheel (25), and an output shaft of the gear box (24) is in transmission connection with a rotating shaft of the swing rod (7) through a transmission mechanism.

7. The automatic toe covering machine for the processing of the polyester shoelace as claimed in claim 6, wherein the transmission mechanism comprises two chain wheels (26) and a chain (27), the two chain wheels (26) are respectively concentrically installed on the output shaft of the gear box (24) and the rotating shaft of the swing rod (7), and the chain (27) is sleeved on the two chain wheels (26).

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