CN211005879U

CN211005879U - Auxiliary transmission device of buttonhole maker

Info

Publication number: CN211005879U
Application number: CN201921323293.1U
Authority: CN
Inventors: 彭丽丽
Original assignee: Beijing Jintianshi Clothing Co ltd
Current assignee: Beijing Jintianshi Clothing Co ltd
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2020-07-14
Anticipated expiration: 2029-08-14

Abstract

The utility model discloses an auxiliary transmission of buttonhole maker, its technical scheme main points are: the auxiliary transmission device comprises an active transmission mechanism arranged in the base and a pressing mechanism arranged on the buttonholing machine body; the two sides of the keyhole platform, which are positioned in the through hole, are respectively provided with a pair of parallel abdicating holes, the active transmission mechanism comprises two rotating rollers which are horizontally clamped in the base, and an upper component which drives the two rotating rollers to move upwards so that the rotating rollers protrude out of the keyhole platform is also arranged in the base; a first driving mechanism for driving the two rotating rollers to rotate in the same direction is also arranged in the base; the pressing mechanism comprises two driven rollers which are arranged above the buttonholing platform and are parallel to the rotating rollers, and two second driving mechanisms which are arranged in the buttonholing machine body and drive the two driven rollers to move downwards so that the rotating rollers and the driven rollers are pressed against each other. The utility model has the advantages that: the cloth can be automatically transmitted, and the keyhole can be conveniently locked again, so that the keyhole efficiency is improved.

Description

Auxiliary transmission device of buttonhole maker

Technical Field

The utility model relates to a buttonhole maker field, concretely relates to auxiliary transmission of buttonhole maker.

Background

Buttons and button holes corresponding to the buttons are designed on many existing clothes, and the edges of the button holes are usually twisted by threads, so that the threads are not easy to be sent out when the buttons are fastened; in a large-scale clothes production workshop, the buttonholes all need to be processed by using special sewing equipment, the buttonhole sewing machine is special sewing equipment for sewing buttonholes and comprises a flat buttonhole sewing machine and a round buttonhole sewing machine and is used for processing buttonholes in various clothes, and the flat heads are that two ends of a buttonhole of a finger-sewing lock are flat and are mainly used for sewing shirts, jackets and clothes; by "round head" it is meant that the front end of the buttonhole of the suture lock is circular. It features beautiful buttonhole shape and uniform and firm stitch. The flat buttonhole sewing machine system generally comprises seven major mechanisms, namely a feeding mechanism, a cutter mechanism, a needle rod mechanism, a needle swinging mechanism, a face shearing mechanism, a bottom shearing mechanism and a control unit. Each set of mechanism has the characteristics and functions of the mechanism, has relative independence, but is closely matched and coordinated in work. The elastic presser foot structure of the buttonholing machine is automatically suitable for clamping different fabric thicknesses. The operator can very simply set parameters through the operation screen to realize the sewing of buttonholes with various shapes and sizes. The automatic upper thread cutting device is convenient to operate, and leaves the appropriate upper thread length required by the initial sewing to ensure the buttonhole sewing. The machine can perform the rotation of cutting before sewing or sewing before cutting very fast.

The utility model discloses a chinese utility model patent with publication number CN203360781U discloses a flat buttonhole maker, it includes base and aircraft nose casing, the upper shaft has set firmly in the aircraft nose casing, the one end of this upper shaft is passed the aircraft nose casing and is linked together and drive the rotation by motor rotor, the aircraft nose portion at the aircraft nose casing is provided with the needle bar support, the needle bar is worn to be equipped with vertically at the free end department of needle bar support, be provided with the thorn material drive mechanism that can drive the needle bar and do the up-and-down motion on the needle bar support between needle bar and the foretell upper shaft, still be equipped with synchronous drive mechanism in the aircraft nose casing, swing drive mechanism, the transmission of feeding mechanism and sanction eye sword.

The buttonhole sewing machine in the above patent document needs to manually move the cloth after sewing one buttonhole each time, and cannot automatically and continuously sew a plurality of buttonholes, so that a plurality of times of positioning is needed, and the efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an auxiliary transmission mechanism of button holing machine, its advantage can be automatically carry out the transmission to the cloth, is convenient for carry out the button holing once more to button holing efficiency has been improved.

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

an auxiliary transmission device of a buttonholing machine is arranged on a buttonholing platform, a buttonholing machine body is arranged above the buttonholing platform, a base is arranged below the buttonholing platform, a through hole for a buttonholing is arranged in the center area of the buttonholing platform, the auxiliary transmission device comprises an active transmission mechanism arranged in the base and a pressing mechanism arranged on the buttonholing machine body and matched with the active transmission mechanism for use;

the two sides of the keyhole platform, which are positioned in the through hole, are respectively provided with a parallel abdicating hole, the active transmission mechanism comprises two rotating rollers which are horizontally clamped in the base, and the two rotating rollers are parallel to each other and positioned below the corresponding abdicating holes; an upper component which drives the two rotating rollers to move upwards to enable the rotating rollers to protrude out of the keyhole platform is also arranged in the base; a first driving mechanism for driving the two rotating rollers to rotate in the same direction is also arranged in the base;

the pressing mechanism comprises two driven rollers which are arranged above the buttonholing platform and are parallel to the rotating rollers, and two second driving mechanisms which are arranged in the buttonholing machine body and drive the two driven rollers to move downwards so that the rotating rollers and the driven rollers are pressed against each other.

Through the technical scheme, after buttonholing work is carried out to the cloth of placing at the buttonholing platform to buttonholing machine body work, upper subassembly work drives two live-rollers rebound, and make two live-rollers protrusion in the upper surface of buttonholing platform, then first actuating mechanism work drives two live-rollers syntropy and rotates, and second actuating mechanism can drive two driven vollers and follow the below-mentioned of buttonholing platform this moment, and make live-roller and driven voller carry out the centre gripping to the cloth, through the control of first actuating mechanism to two live-rollers, thereby drive the cloth and remove to a direction, when having arrived needs buttonholing work, first actuating mechanism stop work, upper subassembly drives two live-rollers return, thereby the staff of being convenient for carries out the buttonholing to the cloth once more. The staff need not to be in lockhole work back at every turn, and the position of manual adjustment cloth again, then is carrying out the counterpoint of lockhole, through the mutually supporting of initiative drive mechanism and pushing down the mechanism, the adjustment cloth that can be automatic is at the removal of lockhole platform, carries out the lockhole at manual fine setting to staff's lockhole efficiency has been improved.

The utility model discloses further set up to: the two ends of each rotating roller are respectively vertically provided with a limiting slide bar, the upper end of each limiting slide bar is fixedly connected with the keyhole platform, the limiting slide bars are fixedly connected with a first limiting piece and a second limiting piece from top to bottom in sequence, the bottom of each rotating roller is provided with a connecting seat for supporting the rotating roller, the connecting seat is rotatably connected with the rotating roller, a first slide sheet connected with the limiting slide bars in a sliding mode is arranged between the first limiting pieces and the second limiting pieces on the limiting slide bars, and one side of each first slide sheet is fixedly connected with the connecting seat.

Through above-mentioned technical scheme, the connecting seat has played the effect of support to the live-rollers to can not influence the free rotation of live-rollers, and first gleitbretter slides on spacing slide bar, thereby has injectd the direction of sliding of live-rollers in the base, and the setting of the spacing piece of second has played the bearing effect to first gleitbretter, has restricted the extreme low position of live-rollers in the base.

The utility model discloses further set up to: a connecting plate is arranged between the two connecting seats, the upper component comprises a first driving motor which is horizontally fixed in the base, and a cam which is fixedly connected to an output shaft of the first driving motor and used for driving the connecting plate to move upwards is arranged on the upper component.

Through the technical scheme, when first driving motor starts, drive the cam and rotate, contact through cam and connecting plate, thereby with the connecting seat lifting, and drive the slip between connecting seat and the spacing slide bar, when global protrusion in the upper surface of keyhole platform of live-rollers, first driving motor stops, make the cam keep the support state to the connecting plate, make two live-rollers keep the state of protrusion and keyhole platform upper surface, after first driving motor restarts, make the cam rotate the minimum, and make two live-rollers receive and release to the base in.

The utility model discloses further set up to: the limiting slide rod is sleeved with a first compression spring, and the first compression spring is located between the first limiting piece and the first sliding piece.

Through above-mentioned technical scheme, in order to ensure that two live-rollers receive and release the reliability to the base in, elastic force is exerted to first gleitbretter to first compression spring's setting, has ensured the smoothness nature of sliding between first gleitbretter and the spacing slide bar, has improved the reliability that two live-rollers fell the position.

The utility model discloses further set up to: the first driving mechanism comprises a first belt pulley coaxially and fixedly connected with the two rotating rollers, a second driving motor arranged in the base, a second belt pulley coaxially and fixedly connected to an output shaft of the second driving motor, and a transmission belt sleeved on the axial surfaces of the two first belt pulleys and the second belt pulley.

Through the technical scheme, when the two rotating shafts are positioned on the upper surface of the protruding keyhole platform, the transmission belt is tightened on the two first belt pulleys and the second belt pulley, the two first belt pulleys are driven to rotate through the rotation of the first driving motor, and then the two rotating rollers synchronously rotate.

The utility model discloses further set up to: the base is internally provided with a tightening assembly for tightening the belt, the tightening assembly comprises a vertical connecting rod fixed in the base and two limiting blocks fixedly connected on the circumferential surface of the connecting rod, a second slip sheet slides on the connecting rod, and one side of the slip sheet is rotatably connected with a tightening roller arranged above the transmission belt.

According to the technical scheme, the position relation of the two rotating rollers can be changed, so that the belt cannot be always in a tight state, when the rotating rollers are positioned at the lower positions, the distance between the two first belt pulleys and the second belt pulley is shortened, the transmission belt is constantly in tight rotation by pressing down the transmission belt between the two first belt pulleys through the tight rollers, and the stability of the transmission belt sleeved on the two first belt pulleys and the second belt pulley is guaranteed; and when two live-rollers moved up, can drive the slip of second gleitbretter on the connecting rod to the guarantee drive belt is in the state of tightening constantly, has ensured the stability of first actuating mechanism work.

The utility model discloses further set up to: the connecting rod is sleeved with a second compression spring, and the second compression spring is located between a limiting block above the second compression spring and a second sliding sheet.

Through above-mentioned technical scheme, the second compression spring applys decurrent effort to the second gleitbretter to increased the pressure of tight roller to the drive belt, ensured the tight state of drive belt, make the drive belt more firm with first belt pulley, the cooperation of second belt pulley.

The utility model discloses further set up to: the second driving mechanism comprises a screw rod vertically arranged in the buttonholing machine body and a limiting rod parallel to the screw rod, the two ends of the screw rod are rotatably connected with the inner wall of the buttonholing machine body, the two ends of the limiting rod are fixedly connected with the inner wall of the buttonholing machine body, one end of the screw rod is provided with a third driving motor for driving the screw rod to rotate, a driving block is connected to the screw rod in a threaded manner and slides and is connected with the limiting rod, a driving rod is fixedly connected to one side of the driving block, and the driven roller sleeve is arranged on the driving rod and is rotatably connected with the driving rod.

Through the technical scheme, when the rotating roller protrudes out of the surface of the keyhole platform, the third driving motor is started to drive the screw rod to rotate, and the screw rod is connected with the driving block through the screw thread, so that the driving block slides along the length direction of the screw rod under the limitation of the limiting rod, the driven roller is driven to move towards the rotating roller, the rotating roller and the driven roller are used for clamping the cloth, and the cloth is driven to move through the rotation of the rotating roller.

To sum up, the utility model discloses following beneficial effect has:

firstly, the cloth is automatically driven to move on the keyhole platform. The upper assembly works to drive the two rotating rollers to move upwards and enable the two rotating rollers to protrude out of the upper surface of the keyhole platform, then the first driving mechanism works to drive the two rotating rollers to rotate in the same direction, at the moment, the second driving mechanism can drive the two driven rollers to move downwards from the upper side of the keyhole platform, the rotating rollers and the driven rollers clamp the cloth, and the first driving mechanism controls the two rotating rollers so as to drive the cloth to move in one direction;

and secondly, the stability is improved. When the rotating roller is positioned at the lower position, the distance between the two first belt pulleys and the second belt pulley is shortened, the transmission belt is constantly in tight rotation by pressing down the transmission belt between the two first belt pulleys through the tightening roller, and the stability of the transmission belt sleeved on the two first belt pulleys and the second belt pulley is ensured.

Drawings

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

FIG. 2 is a schematic diagram showing the internal structure of the base;

FIG. 3 is a schematic view showing the connection between the rotating roller and the base;

FIG. 4 is a schematic diagram showing the structure of the upper module;

FIG. 5 is a schematic diagram of the working state of the upper assembly;

FIG. 6 is an enlarged view of detail A of FIG. 5;

FIG. 7 is a schematic view showing the opened position of the chute;

fig. 8 is a schematic view showing the push-down mechanism.

In the figure, 11, a workbench; 12. a base; 13. a keyhole platform; 131. a through hole; 132. a hole of abdication; 14. a buttonholing machine body; 141. a housing; 142. a chute; 2. an active transmission mechanism; 21. a rotating roller; 211. a limiting slide bar; 212. a first limiting sheet; 213. a second limiting sheet; 214. a first slip sheet; 215. a connecting seat; 216. a first compression spring; 217. a connecting plate; 22. an upper component; 221. a first drive motor; 222. a cam; 23. a first drive mechanism; 231. a first pulley; 232. a second drive motor; 233. a second pulley; 234. a transmission belt; 24. a tightening assembly; 241. a connecting rod; 242. a limiting block; 243. a second slip sheet; 244. a second compression spring; 245. a connecting shaft; 246. a tension roller; 3. a pressing mechanism; 31. a driven roller; 32. a drive assembly; 321. a screw; 322. a limiting rod; 323. a third drive motor; 324. a drive block; 325. a drive rod.

Detailed Description

An auxiliary transmission device of a buttonholing machine is arranged in the buttonholing machine as shown in figure 1, and the buttonholing machine comprises a base 12 fixed above a workbench 11, a buttonholing platform 13 horizontally arranged above the base 12, and a buttonholing machine body 14 fixed above the buttonholing platform 13. The buttonholing machine body 14 comprises a shell 141, and a feeding mechanism, a cutter mechanism, a needle rod mechanism, a needle swinging mechanism, a face shear mechanism, a bottom shear mechanism and a control unit which are arranged in the shell 141. The feeding mechanism, the cutter mechanism, the needle bar mechanism, the needle swinging mechanism, the face shearing mechanism, the bottom shearing mechanism and the control unit are all the prior art in the field of buttonholing machines and are not described in detail herein.

As shown in fig. 1, a through hole 131 for a keyhole is formed in the central area of the keyhole platform 13, and the through hole 131 is in a strip shape; two sides of the through hole 131 are respectively provided with a strip-shaped yielding hole 132, and the two yielding holes 132 are arranged at equal intervals with the through hole 131 and are parallel to the through hole 131.

An auxiliary transmission device of a buttonholing machine, as shown in fig. 2, comprises an active transmission mechanism 2 arranged in a base 12 and a pressing mechanism 3 arranged in a shell 141 and used for being matched with the active transmission mechanism 2. The driving transmission mechanism 2 comprises two rotating rollers 21 erected in the base 12, the two rotating rollers 21 are parallel to each other and located right below each yielding hole 132, the driving transmission mechanism 2 further comprises an upper assembly 22 arranged below the two rotating rollers 21 and driving the two rotating rollers 21 to vertically displace, and a first driving mechanism 23 arranged in the base 12 and driving the two rotating rollers 21 to rotate in the same direction.

As shown in fig. 3, two ends of each rotating roller 21 are vertically provided with a limiting slide bar 211, an upper end of each limiting slide bar 211 is fixedly connected to a lower surface of the keyhole platform 13, a circumferential surface of each limiting slide bar 211 is fixedly connected to a first limiting piece 212 and a second limiting piece 213 from top to bottom, a first sliding piece 214 penetrates through each limiting slide bar 211, the limiting slide bars 211 are connected with the first sliding pieces 214 in a sliding manner, and the first sliding pieces 214 are located between the first limiting pieces 212 and the second limiting pieces 213. A connecting seat 215 for mounting the rotating roller 21 is disposed below the rotating roller 21, the connecting seat 215 is U-shaped, the rotating roller 21 is disposed between the connecting seats 215, and both ends of the rotating roller 21 are rotatably connected to the connecting seat 215, and the first sliding piece 214 is fixedly connected to one side of the connecting seat 215. The limiting slide bar 211 is further sleeved with a first compression spring 216, two ends of the first compression spring 216 respectively abut against the first limiting piece 212 and the first sliding piece 214, and the lower surface of the first sliding piece 214 abuts against the upper surface of the second limiting piece 213 through the elastic acting force of the first compression spring 216, so that the sliding stability of the first sliding piece 214 and the limiting slide bar 211 is guaranteed.

As shown in fig. 4 and 5, a connecting plate 217 is horizontally disposed between the two connecting seats 215, and two ends of the connecting plate 217 are respectively fixedly connected with the connecting seats 215 at two sides. The upper assembly 22 includes a first driving motor 221 fixed on the inner bottom surface of the base 12, and a cam 222 fixed to an output shaft of the first driving motor 221. The cam 222 is located below the connection plate 217, and the outer circumferential surface of the cam 222 constantly abuts against the lower surface of the connection plate 217. The first driving motor 221 is a stepping motor, and can control the angular displacement by controlling the number of pulses, so as to achieve the purpose of accurate positioning, and therefore, the first driving motor 221 can accurately control the rotation angle of the cam 222, and when the first driving motor 221 stops rotating, the cam 222 keeps a stationary state and cannot rotate freely. When the upper assembly 22 works, the first driving motor 221 is started to drive the cam 222 to rotate, the peripheral surface of the cam 222 is abutted to the connecting plate 217 at any time, the connecting plate 217 is driven to move upwards, the connecting seat 215 drives the peripheral surface of the rotating roller 21 to partially protrude out of the upper surface of the keyhole platform 13, at this time, the first driving motor 221 stops rotating, the cam 222 keeps in a static state, the two rotating rollers 21 are continuously positioned in a state of protruding out of the upper surface of the keyhole platform 13, and the first driving mechanism 23 is convenient to drive the two rotating rollers 21 to rotate. When the rotating roller 21 protrudes out of the upper surface of the keyhole platform 13, the rotating roller 21 and the cloth rub against each other, which is not convenient for the cloth to move freely, so the first driving motor 221 continues to work to drive the cam 222 to rotate, and when the cam 222 rotates to the lowest position, the rotating roller 21 is driven to rapidly fall through the elastic acting force of the first compression spring 216, which is convenient for the next operation of the cloth of the keyhole platform 13.

As shown in fig. 4 and 5, the first driving mechanism 23 includes first belt pulleys 231 coaxially fixed to the two rotating rollers 21, respectively, and the two first belt pulleys 231 are located on the same side of the rotating rollers 21; a second driving motor 232 fixedly connected with the inner bottom surface of the base 12 is further arranged between the two rotating rollers 21, an output shaft of the second driving motor 232 is coaxially and fixedly connected with a second belt pulley 233, the two first belt pulleys 231 and the second belt pulley 233 are located in the same vertical plane, and a driving belt 234 is simultaneously sleeved on the two first belt pulleys 231 and the second belt pulley 233. And a tensioning assembly 24 is disposed above the belt 234 and presses the belt 234 to maintain the belt 234 in a taut state.

As shown in fig. 6, the tightening assembly 24 includes a connecting rod 241 vertically disposed, the connecting rod 241 is located above the second driving motor 232, the upper end of the connecting rod 241 is fixedly connected to the lower surface of the keyhole platform 13, two limit blocks 242 are fixedly connected to the circumferential surface of the connecting rod 241 along the length direction of the connecting rod 241, a second sliding sheet 243 is arranged on the connecting rod 241 in a penetrating manner, the connecting rod 241 is connected to the second sliding sheet 243 in a sliding manner, and the second sliding sheet 243 is located between the two limit blocks 242. A second compression spring 244 is further sleeved on the connecting rod 241, and the second compression spring 244 is located between the second sliding vane 243 and the upper limit block 242; a connecting shaft 245 is horizontally and fixedly connected to one side of the second sliding vane 243 facing the transmission belt 234, a tightening roller 246 rotating coaxially with the connecting shaft 245 is sleeved on the connecting shaft 245, and the tightening roller 246 is pressed on the uppermost side of the transmission belt 234.

When the two rotating rollers 21 are located in the base 12, the tightening roller 246 is under the elastic force of the second compression spring 244, so that the tightening roller 246 is pressed right above the transmission belt 234, and the transmission belt 234 is tightened on the circumferential surfaces of the two first belt pulleys 231 and the second belt pulley 233, thereby ensuring the stability of the transmission belt 234 sleeving the first belt pulley 231 and the second belt pulley 233; when the two rotating rollers 21 are driven by the upper assembly 22, the rotating rollers 21 move upwards, and part of the outer peripheral surfaces of the rotating rollers 21 protrude out of the upper surface of the keyhole platform 13. In the process that the two first belt pulleys 231 move upwards, the deformation of the transmission belt 234 is driven, because the length of the transmission belt 234 is fixed, in order to keep the stability that the transmission belt 234 is sleeved on the two first belt pulleys 231 and the second belt pulley 233 at the same time, the tightening roller 246 moves along the length direction of the connecting rod 241 along with the displacement of the transmission belt 234, and drives the second compression spring 244 to compress elastically, so that the transmission belt 234 is sleeved with the two first belt pulleys 231 and the second belt pulley 233 more tightly under the pressure action of the second compression spring 244. At this time, the second driving motor 232 is started to drive the second belt pulley 233 to rotate, and simultaneously, the two first belt pulleys 231 are driven to rotate through the transmission of the transmission belt 234, so that the two rotating rollers 21 rotate in the same direction.

As shown in fig. 7 and 8, the pressing mechanism 3 includes a driven roller 31 horizontally disposed right above each of the abdicating holes 132, and a driving assembly 32 for respectively driving the two driven rollers 31 to vertically displace, the two driven rollers 31 are parallel to the rotating roller 21, the driving assembly 32 includes a screw 321 and a limiting rod 322 vertically disposed in the casing 141, two ends of the screw 321 are rotatably connected with an inner wall of the casing 141, two ends of the limiting rod 322 are fixedly connected with an inner wall of the casing 141, a third driving motor 323 is vertically fixedly connected in the casing 141, an output shaft of the third driving motor 323 is coaxially and fixedly connected with the screw 321, the screw 321 is further threadedly connected with a driving block 324, the limiting rod 322 is inserted in the driving block 324 and slidably connected with the driving block 324, one side of the driving block 324 is fixedly connected with an L-type driving rod 325, the driven roller 31 is horizontally connected to an end of the driving rod 325 and rotatably connected with the driving rod 325, and two sides of the casing 141 are respectively provided with a sliding groove 142 for accommodating the driving rod 325.

When the staff performs keyhole operation on the cloth, the two rotating rollers 21 are driven by the upper component 22, so that the rotating rollers 21 protrude out of the upper surface of the keyhole platform 13. At this time, the two third driving motors 323 are started to drive the screw rods 321 to rotate, the driving blocks 324 are in threaded fit with the screw rods 321, the driving blocks 324 drive the driving rods 325 to move in the vertical direction under the limitation of the limiting rods 322, the driven rollers 31 are displaced downwards to be attached to the corresponding rotating rollers 21, and the cloth is clamped between the driven rollers 31 and the rotating rollers 21. At this moment, the second driving motor 232 is started, the two rotating rollers 21 are driven to rotate in the same direction through the transmission of the transmission belt 234, the friction force between the cloth and the rotating rollers 21 is increased through the pressing of the driven rollers 31, so that the cloth is displaced on the keyhole platform 13, when the cloth is displaced to a position needing keyhole, the second driving motor 232 stops working, the upper component 22 drives the two rotating rollers 21 to return to the base 12, the third driving motor 323 rotates reversely to drive the two driven rollers 31 to move upwards, at the moment, a worker can finely adjust the cloth and perform the keyhole function again, after the keyhole is completed, the cloth is automatically moved again through the matching of the active transmission mechanism 2 and the pressing mechanism 3, the manual frequent operation is reduced, the physical consumption of the worker is saved, and the keyhole efficiency is also improved.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. An auxiliary transmission device of a buttonholing machine is characterized in that: the auxiliary transmission device is arranged on the keyhole platform (13), a keyhole machine body (14) is arranged above the keyhole platform (13), a base (12) is arranged below the keyhole platform (13), a through hole (131) for keyhole is formed in the central area of the keyhole platform (13), the auxiliary transmission device comprises an active transmission mechanism (2) arranged in the base (12), and a pressing mechanism (3) which is arranged on the keyhole machine body (14) and is matched with the active transmission mechanism (2) for use;

the two sides of the keyhole platform (13) positioned in the through hole (131) are respectively provided with a pair of parallel abdicating holes (132), the active transmission mechanism (2) comprises two rotating rollers (21) horizontally clamped in the base (12), and the two rotating rollers (21) are parallel to each other and positioned below the corresponding abdicating holes (132); an upper component (22) which drives the two rotating rollers (21) to move upwards so that the rotating rollers (21) protrude out of the keyhole platform (13) is also arranged in the base (12); a first driving mechanism (23) which drives the two rotating rollers (21) to rotate in the same direction is also arranged in the base (12);

the pressing mechanism (3) comprises two driven rollers (31) which are arranged above the keyhole platform (13) and are parallel to the rotating roller (21), and two second driving mechanisms which are arranged in the keyhole machine body (14) and drive the two driven rollers (31) to move downwards so that the rotating roller (21) and the driven rollers (31) are pressed against each other.

2. An auxiliary transmission device for a buttonholing machine according to claim 1, wherein: the both ends of every live-action roller (21) respectively vertically are provided with a spacing slide bar (211), the upper end and keyhole platform (13) fixed connection of spacing slide bar (211), and spacing slide bar (211) rigid coupling has first spacing piece (212) and spacing piece (213) of second from top to bottom in proper order, live-action roller (21) bottom is provided with a connecting seat (215) that supports live-action roller (21), and connecting seat (215) rotate with live-action roller (21) and are connected, lie in on spacing slide bar (211) between first spacing piece (212) and the spacing piece (213) of second and be provided with one and slide first gleitbretter (214) of being connected with spacing slide bar (211), first gleitbretter (214) one side and connecting seat (215) fixed connection.

3. An auxiliary transmission device for a buttonholing machine according to claim 2, wherein: a connecting plate (217) is arranged between the two connecting seats (215), the upper component (22) comprises a first driving motor (221) horizontally fixed in the base (12), and a cam (222) fixedly connected to an output shaft of the first driving motor (221) and used for driving the connecting plate (217) to move upwards.

4. An auxiliary transmission device for a buttonholing machine according to claim 3, wherein: the limiting slide bar (211) is sleeved with a first compression spring (216), and the first compression spring (216) is positioned between the first limiting sheet (212) and the first sliding sheet (214).

5. An auxiliary transmission device for a buttonholing machine according to claim 1, wherein: the first driving mechanism (23) comprises a first belt pulley (231) coaxially fixedly connected with the two rotating rollers (21), a second driving motor (232) arranged in the base (12), a second belt pulley (233) coaxially fixedly connected to an output shaft of the second driving motor (232), and a transmission belt (234) sleeved on the shaft surfaces of the two first belt pulleys (231) and the second belt pulley (233) at the same time.

6. An auxiliary transmission device for a buttonholing machine according to claim 5, wherein: the belt tightening mechanism is characterized in that a tightening assembly (24) for tightening a belt is arranged in the base (12), the tightening assembly (24) comprises a connecting rod (241) vertically fixed in the base (12), two limiting blocks (242) fixedly connected to the peripheral surface of the connecting rod (241), a second slip sheet (243) is connected to the connecting rod (241) in a sliding mode, and a tightening roller (246) arranged above the transmission belt (234) is connected to one side of the second slip sheet (243) in a rotating mode.

7. An auxiliary transmission device for a buttonholing machine according to claim 6, wherein: a second compression spring (244) is sleeved on the connecting rod (241), and the second compression spring (244) is located between the limiting block (242) above and the second sliding sheet (243).

8. An auxiliary transmission device for a buttonholing machine according to claim 1, wherein: second actuating mechanism includes vertical screw rod (321) that sets up in button holing machine body (14), gag lever post (322) parallel to each other with screw rod (321), the both ends and button holing machine body (14) inner wall of screw rod (321) rotate and are connected, the both ends and button holing machine body (14) inner wall fixed connection of gag lever post (322), the one end of screw rod (321) is provided with drive screw rod (321) pivoted third driving motor (323), threaded connection has a drive block (324) on screw rod (321), drive block (324) slide with gag lever post (322) and be connected, drive block (324) one side rigid coupling has a actuating lever (325), driven voller (31) cover is established on actuating lever (325) and is rotated with actuating lever (325) and is connected.