CN218404677U - Small-mouth type feeding tooth driving mechanism of sewing machine - Google Patents

Abstract

The utility model discloses a sewing machine small mouth formula pay-off tooth actuating mechanism, including pay-off tooth, tooth frame seat, upper and lower drive mechanism, transverse transmission mechanism, actuating mechanism. The upper and lower transmission mechanisms comprise a pair of feed lifting tooth shafts which are rotatably arranged on the bottom plate member and driven, and the transverse transmission mechanism comprises a feeding transmission shaft which is rotatably arranged on the bottom plate member in a reciprocating rotation manner. The upper and lower transmission mechanisms are matched with the transverse transmission mechanism to drive the feeding teeth to continuously generate feeding action. The length of the small nozzle can be adjusted by adjusting the lengths of the pair of feed lifting tooth shafts and the feed transmission shaft as required by taking the position of a sewing machine needle as a base point, and meanwhile, the lengths of the feed shaft and the crank connecting shaft can be adjusted as required to adapt to the overall length and volume of the sewing machine. The transmission structure of the feed lifting shaft, the feed transmission shaft, the feed shaft, the crank connecting shaft, the connecting rod and the crank is not limited by the length of the transmission distance. The corresponding length can be set completely according to the needs to meet the needs of the length of the small mouth.

Description

Small-mouth type feeding tooth driving mechanism of sewing machine

Technical Field

The utility model relates to a sewing machine pay-off tooth actuating mechanism.

Background

The existing cylinder type differential computer flat sewing machine needs to be provided with a sleeve, the outer diameter of the sleeve needs to be as small as possible to meet the use requirement due to the sewing process and the requirements of the caliber of sewing materials, such as the sewing of cylindrical articles like trouser legs, cuffs and the like, and meanwhile, due to the fact that a feeding mechanism, a thread cutting mechanism and the like need to be placed in the sleeve, due to the limitation of space, the strict requirements on the space size of the feeding mechanism and the thread cutting mechanism are provided. It has been found that the feeding mechanism existing in the market is influenced by the manufacturing process, abrasion, strength and the like of parts, when the presser foot and the upper feeding tooth are put down, the lower tooth is pressed to deform to be at the level of the upper plane of the needle plate or slightly higher than the upper plane of the needle plate, so that feeding is unsmooth or extremely unsmooth.

Disclosure of Invention

The utility model provides a material tooth driving mechanism which can effectively increase the length of a small-mouth type mouth to solve the problems existing in the prior art.

The utility model provides a technical scheme who has the problem is: the small-mouth feeding tooth driving mechanism for sewing machine includes feeding tooth, tooth frame seat, upper and lower driving mechanisms, transverse driving mechanism and driving mechanism. The upper and lower transmission mechanisms are used for driving the tooth rack seats to move up and down, each upper and lower transmission mechanism comprises a pair of tooth lifting shafts rotatably arranged on the bottom plate component, a driving connecting rod component for driving the pair of tooth lifting shafts to rotate, a second crank and a tooth lifting connecting rod for driving the second crank, a conversion sliding block is movably and eccentrically arranged at the end, corresponding to the tooth rack seat, of each tooth lifting shaft or a conversion shaft is eccentrically arranged at the end, corresponding to the tooth rack seat, and a guide sliding structure is arranged between the conversion sliding block or the conversion shaft and the tooth rack seat; the driving connecting rod assembly comprises a first crank and a pair of driving connecting rods, one end of each driving connecting rod is movably connected with the other end of the feed lifting rock shaft, the other ends of the pair of driving connecting rods are movably connected with the first crank, and a crank connecting shaft is arranged between the first crank and the second crank. The transverse transmission mechanism is used for driving the tooth rack seat to transversely move and comprises a feeding shaft, a feeding transmission crank, a feeding connection connecting rod movably mounted on the feeding transmission crank and used for driving the tooth rack seat to transversely move, and a feeding transmission shaft rotationally mounted on the bottom plate component and used for driving the feeding transmission crank to rotate in a reciprocating mode. The driving mechanism is used for providing power, driving the upper and lower transmission mechanisms and the transverse transmission mechanism to coordinate and drive the feeding teeth to act, and comprises a first cam or eccentric wheel and a second cam or eccentric wheel which are arranged on the same driving shaft, the first cam or eccentric wheel is matched with the upper end of the feed lifting connecting rod, and the second cam or eccentric wheel is matched with the upper end of the feed feeding connecting rod.

As a further improvement, the drive mechanism comprises a first eccentric wheel or/and a second eccentric wheel, and the eccentric wheel is provided with an outer ring connected with the corresponding connecting rod.

As a further improvement, the first cam or eccentric wheel and the second cam or eccentric wheel are arranged on the same driving shaft; still including the stationary knife that mutually supports with move the sword, move the sword and be equipped with and move the sword frame, move the sword frame and be connected with rotatory ring, the bottom plate component be located rotatory ring one side, rotatable installation have the trimming transmission shaft, trimming transmission shaft and rotatory ring between be equipped with first transmission structure, be equipped with driving motor on the drain pan of sewing machine, driving motor and trimming transmission shaft between be equipped with second transmission structure, the pay-off transmission shaft set up in the below of another tooth axle of lifting.

As a further improvement, the crank connecting shaft and the feeding shaft are rotatably arranged on the bottom shell; the crank connecting shaft, the feeding shaft, the feed lifting shaft or the feed transmission shaft are provided with rotating sleeves or bearings.

As a further improvement, the pair of feed lifting shafts and the pair of driving connecting rods are arranged at two sides of the lower shaft, the pair of driving connecting rods are arc-shaped bent connecting rods, and the lower ends of the pair of driving connecting rods are rotatably connected with the first crank; the lower shaft is arranged between the pair of driving connecting rods.

As a further improvement, the guide sliding structure comprises sliding guide grooves arranged on two sides of the dental articulator seat, and the conversion sliding block or the conversion shaft is arranged in the sliding guide grooves in a sliding manner.

As a further improvement, a conversion handle is arranged at the corresponding end of the tooth lifting shaft positioned on the tooth frame seat, and the conversion sliding block is movably arranged on the conversion handle or the conversion shaft is arranged on the conversion handle; the transmission connecting rod assembly comprises a third crank movably arranged on the feeding shaft and a feeding small shaft crank movably arranged at one end corresponding to the feeding transmission shaft, and a transmission connecting rod is movably connected between the feeding small shaft crank and the third crank; a small-shaft feed lifting crank is connected between each driving connecting rod and the corresponding feed lifting rock shaft, the small-shaft feed lifting crank is mounted on the feed lifting rock shaft, and the other end of the small-shaft feed lifting crank is movably connected with the driving connecting rod.

As a further improvement, the device also comprises a feeding swing plate component which is connected with the cloth feeding crank to adjust the stroke position of the feeding teeth, a feeding long swing plate is also rotationally connected between the cloth feeding crank and the feeding connecting rod, and the feeding long swing plate is coaxially connected with a first rotating shaft which is rotationally connected with the feeding connecting rod and arranged in the feeding swing plate component; the feeding long swinging plates can be arranged in a pair, the corresponding end of the feeding connecting rod is clamped at the corresponding end between the feeding long swinging plates, and the cloth feeding crank is clamped at the corresponding other end between the feeding long swinging plates.

As a further improvement, the feeding swing plate assembly comprises a feeding short swing plate, a needle tool regulator and a feeding swing seat which is rotatably arranged on the bottom plate component, wherein the feeding swing seat is provided with a groove, one end of the feeding short swing plate is rotatably arranged on the inner wall of the groove of the feeding swing seat, and the other end of the feeding short swing plate is rotatably connected to the outer side of the first rotating shaft; the feeding short swing plates are provided with a pair, and the pair of feeding short swing plates are clamped at the outer sides of the pair of feeding long swing plates; the feeding swing plate assembly further comprises a manual adjusting structure.

As a further improvement, the movable connection is a rotary connection.

Compared with the prior art, the utility model is provided with a driving mechanism, an upper and lower transmission mechanism for driving the tooth frame seat to drive the feeding teeth to feed, a transverse transmission mechanism and a driving mechanism; the upper and lower transmission mechanisms comprise a pair of feed lifting tooth shafts which are rotatably arranged on the bottom plate member for driving, and the transverse transmission mechanism comprises a feeding transmission shaft which is rotatably arranged on the bottom plate member in a reciprocating rotation manner; the feed lifting shaft can be driven to act by combining a corresponding eccentric wheel or cam of the driving mechanism with a necessary connecting rod, crank and crank connecting shaft; the feeding transmission shaft can be driven to act by the corresponding eccentric wheel or cam of the driving mechanism in combination with a necessary connecting rod, crank and feeding shaft. Finally, the tooth frame seat is driven by a pair of conversion sliding blocks or conversion shafts eccentrically arranged at the corresponding ends of the tooth lifting shafts to drive the feeding teeth to move up and down, the feeding crank is driven by the feeding transmission shaft, and the feeding crank is connected with a connecting rod through feeding to drive the feeding teeth to generate transverse feeding action from one side wall of the accommodating groove in the tooth frame seat through rotation. The upper and lower transmission mechanisms are matched with the transverse transmission mechanism to drive the feeding teeth to continuously generate feeding action. The length of the small nozzle can be adjusted by adjusting the lengths of the pair of feed lifting tooth shafts and the feed transmission shaft according to requirements by taking the position of a sewing machine needle as a base point, and the lengths of the feed shaft and the crank connecting shaft can be adjusted according to requirements so as to adapt to the overall length and volume of the sewing machine. The transmission structure provided with the pair of feed lifting shafts, the feed transmission shaft, the feed shaft and the crank connecting shaft combined with the connecting rod and the crank is not limited by the length of the transmission distance. The corresponding length can be set completely according to the needs to meet the needs of the length of the small mouth.

Drawings

Fig. 1 is a schematic view of a small-mouth type sewing machine of the present invention.

Fig. 2 is a schematic view of the feed dog drive of the present invention.

Fig. 3 is an enlarged schematic view of fig. 2 at a.

Fig. 4 is a schematic structural view of a first viewing angle of the feeding tooth drive of the present invention.

Fig. 5 is an enlarged schematic view of fig. 4 at b.

Fig. 6 is a schematic structural view of the second viewing angle of the feeding tooth driving device of the present invention.

Fig. 7 is an enlarged schematic view at c of fig. 6.

Fig. 8 is an enlarged schematic view at d of fig. 6.

Fig. 9 is a schematic structural view of a third viewing angle of the feeding tooth driving mechanism of the present invention.

Fig. 10 is an enlarged schematic view at e of fig. 9.

Fig. 11 is a schematic view of the feeding oscillating plate assembly according to the present invention.

Fig. 12 is a structural schematic diagram of a fourth view angle of the feeding tooth driving device of the present invention.

Fig. 13 is an enlarged schematic view at f of fig. 12.

Fig. 14 is a partially enlarged schematic view of the present invention.

Fig. 15 is an enlarged schematic view at g of fig. 14.

Fig. 16, 17, 18 are enlarged schematic views of different viewing angles at the thread cutting mechanism, respectively.

Detailed Description

Referring to fig. 1 to 18, the driving mechanism 3 of the small-mouth feeding tooth 5 of the sewing machine of the embodiment includes a feeding tooth 5, a tooth frame seat 4, an up-down transmission mechanism 2, a transverse transmission mechanism 2, and a driving mechanism 3.

The upper and lower transmission mechanisms 1 are used for driving the tooth frame base 4 to move up and down, each upper and lower transmission mechanism 1 comprises a pair of tooth lifting shafts 10 which are rotatably arranged on the bottom plate member 6, a driving connecting rod assembly for driving the pair of tooth lifting shafts 10 to rotate, a second crank 12 and a tooth lifting connecting rod 13 for driving the second crank 12, a conversion slider 11 is movably and eccentrically arranged at the end, corresponding to the tooth frame base 4, of each tooth lifting shaft 10, or a conversion shaft is eccentrically arranged on each tooth lifting shaft, so that the conversion slider 11 or the conversion shaft and the tooth lifting shafts 10 are eccentrically arranged, and a guide sliding structure is arranged between the conversion slider 11 or the conversion shaft and the tooth frame base 4; the driving connecting rod assembly comprises a first crank 14 and a pair of driving connecting rods 15, one end of each driving connecting rod 15 is movably connected with the other end of the feed lifting rock shaft 10, the other ends of the pair of driving connecting rods 15 are movably connected with the first crank 14, and a crank connecting shaft 16 is arranged between the first crank 14 and the second crank 12. The transverse transmission mechanism 2 is used for driving the tooth rack seat 4 to transversely move, the transverse transmission mechanism 2 comprises a feeding shaft 23, a feeding transmission crank 21, a feeding connection connecting rod 20 movably arranged on the feeding transmission crank 21 and used for driving the tooth rack seat 4 to transversely move, and a feeding transmission shaft 22 rotatably arranged on the bottom plate component 6 in a reciprocating rotation mode and used for driving the feeding transmission crank 21 to reciprocate, the feeding shaft 23 is connected with a cloth feeding crank 24, the cloth feeding crank 24 is connected with a feeding connecting rod 25, a transmission connecting rod assembly for transmitting power is arranged between the feeding shaft 23 and the feeding transmission shaft 22, an accommodating groove 42 for accommodating the feeding transmission crank 21 and the feeding connection connecting rod 20 is formed in the tooth rack seat 4, and the feeding connection connecting rod 20 is rotatably connected with one side wall of the accommodating groove 42. Specifically, the second shaft 201 can be rotatably connected to the dental articulator holder 4, and the dental articulator holder 4 is provided with a first shaft hole 43 at a corresponding position on a side wall of the accommodating groove 42. The driving mechanism 3 is used for providing power and driving the upper and lower transmission mechanisms 1 and the transverse transmission mechanism 2 to coordinate and drive the feeding teeth 5 to act, the driving mechanism 3 comprises a first cam or eccentric wheel and a second cam or eccentric wheel which are arranged on the same driving shaft, the first cam or eccentric wheel is matched with the upper end of the tooth lifting connecting rod 13, and the second cam or eccentric wheel is matched with the upper end of the feeding connecting rod 25. The first cam or eccentric wheel and the second cam or eccentric wheel are arranged on the same driving shaft, such as an upper shaft of a sewing machine.

In order to facilitate manufacturing and control, and to improve the driving accuracy, the driving mechanism comprises a first eccentric 31 or/and a second eccentric 32, which are provided with outer rings connected to corresponding connecting rods. The eccentric wheel has higher precision and is convenient to manufacture.

The crank connecting shaft 16 and the feeding shaft 23 are rotatably arranged on the bottom shell 61; the crank connecting shaft 16, the feeding shaft 23, the feed lifting tooth shaft 10 or the feed transmission shaft 22 are provided with a rotating sleeve 7 or a bearing. Namely, the crank connecting shaft 16 and the feeding shaft 23 are mounted on the bottom shell 61 through a rotary sleeve or a bearing, and the feed lifting shaft 10 and the feeding transmission shaft 22 are mounted on the bottom plate member 6 through a bearing or a rotary sleeve.

Preferably, for convenience of layout, in order to adapt to the existing bottom plate member 6, the pair of feed lifting shafts 10 and the pair of driving links 15 are arranged at two sides of the lower shaft 9, the pair of driving links 15 are arc-shaped bent links, and the lower ends of the pair of driving links 15 are rotatably connected with the first crank 14; the lower shaft 9 is disposed between a pair of drive links 15.

The utility model discloses a main drive disk assembly crank connecting axle 16, pay-off axle 23, lifting teeth axle 10 and pay-off transmission shaft 22 are the axle transmission, can set up suitable length according to actual need, and the transmission no longer receives the distance, therefore the accessible changes the length of lifting teeth axle 10 and pay-off transmission shaft 22, the length of multiplicable or reduction little mouth to in adaptation special sewing.

The guiding sliding structure may preferably include sliding guide grooves 41 disposed at both sides of the dental articulator holder 4, and the switching slider 11 or the switching shaft is slidably disposed in the sliding guide grooves 41. Of course, other conventional technical structure may be adopted so as to drive the dental articulator holder 4 to move up and down by the rotation of the dental elevator shaft 10.

In order to facilitate installation and smooth driving so as to adapt to the space at the bottom plate component 6 of the sewing machine, the feed lifting shaft 10 is provided with a conversion handle 17 at the corresponding end of the feed lifting frame base 4, the conversion slide block 11 or the conversion shaft can be eccentrically installed relative to the feed lifting shaft 10 through the conversion handle 17 so as to facilitate the conversion slide block 11 or the conversion shaft and the feed lifting shaft 10 to be matched with a larger space, the conversion slide block 11 is movably installed on the conversion handle 17, and if the conversion shaft is used, the conversion shaft can be fixedly installed on the conversion handle 17. A small-shaft feed lifting crank 18 is connected between each driving connecting rod 15 and the corresponding feed lifting rock shaft 10, the small-shaft feed lifting crank 18 is mounted on the feed lifting rock shaft 10, and the other end of the small-shaft feed lifting crank 18 is movably connected with the driving connecting rod 15. The transmission connecting rod assembly comprises a third crank 26 movably arranged on the feeding shaft 23 and a feeding small shaft crank 27 movably arranged at the corresponding end of the feeding transmission shaft 22, and a transmission connecting rod 28 is movably connected between the feeding small shaft crank 27 and the third crank 26.

The feeding swing plate component 8 is connected with the cloth feeding crank 24 to adjust the stroke position of the feeding teeth 5, a feeding long swing plate 29 is further rotatably connected between the cloth feeding crank 24 and the feeding connecting rod 25, and the feeding long swing plate 29 is coaxially connected with a first rotating shaft in rotary connection with the feeding connecting rod 25 and is arranged in the feeding swing plate component 8; the feeding long swing plates 29 can be arranged in a pair, the corresponding ends of the feeding connecting rods 25 are clamped at the corresponding ends between the feeding long swing plates 29, and the cloth feeding cranks 24 are clamped at the corresponding other ends between the feeding long swing plates 29.

The feeding swing plate component 8 comprises a feeding short swing plate 80, a needle tool adjuster 81 and a feeding swing seat 82 which is rotatably arranged on the bottom plate component 6, the feeding swing seat 82 is provided with a groove 83, one end of the feeding short swing plate 80 is rotatably arranged on the inner wall of the groove 83 of the feeding swing seat 82, and the other end of the feeding short swing plate is rotatably connected to the outer side of the first rotating shaft; the feeding short swing plates 80 are provided in a pair, and the pair of feeding short swing plates 80 are sandwiched between the outer sides of the pair of feeding long swing plates 29. The needle adjuster 81 may include an adjusting block 85 rotatably disposed in the housing, and an adjusting link assembly 84 movably connecting the adjusting block 85 with the feeding swing seat 82 to adjust the feeding swing seat 82, wherein the adjusting block 85 may be driven by a manual rotation or a motor, or other power on the sewing machine, and the adjusting block 85 may also be engaged with an adjusting screw or/and driven by a rotating shaft, and the adjusting block 85 may be adjusted by the adjusting screw or the rotating shaft. The feeding swing plate component 8 further comprises a manual adjusting structure.

The movable connection can adopt the prior art structure capable of realizing driving transmission, and a rotating shaft and a matched shaft hole can be adopted for the rotary connection.

The utility model discloses during the structure uses, debugs installation, the running position of each part in advance, debugs the running position and the pay-off route of pay-off tooth 5 through actuating mechanism 3, lower drive mechanism 1 combination transverse transmission mechanism 2.

The driving shaft (upper shaft) drives the first eccentric wheel and the second eccentric wheel of the driving mechanism 3 to rotate.

The lifting tooth connecting rod 13 matched with the first eccentric wheel 31 on the up-and-down transmission mechanism 1 rotates around the crank connecting shaft 16 in a reciprocating mode along with the rotating first eccentric wheel, the first crank 14 connected to the crank connecting shaft 16 swings in a reciprocating mode along with the connecting shaft 16, the swinging first crank 14 drives the pair of driving connecting rods 15 to deflect in a reciprocating mode, the pair of driving connecting rods 15 deflecting in the reciprocating mode can directly drive the pair of lifting tooth shafts 10 to rotate in a reciprocating mode, in the embodiment, the pair of driving connecting rods 15 can drive the pair of lifting tooth shafts 10 to rotate through the small-shaft lifting tooth crank 18, the lifting tooth shafts 10 rotating in the reciprocating mode are matched with the sliding guide grooves 41 in the corresponding positions of the tooth rack seat 4 under the action of the conversion sliding blocks 11 or the conversion shafts arranged eccentrically with the lifting tooth shafts 10, and the conversion sliding guide grooves 41 are matched with the conversion blocks 11 or the conversion shafts arranged eccentrically with the lifting tooth shafts, and the tooth rack seat 4 is driven to reciprocate up and down. The switching slider 11 or the switching shaft is preferably mounted on the switching handle 17 and is engaged with the sliding guide groove 41 by the switching handle 17 on the feed lifting shaft 10.

Meanwhile, a feeding connecting rod 25 matched with the second eccentric wheel 32 on the transverse transmission mechanism 2 drives a feeding shaft 23 to rotate in a reciprocating mode along with the rotating second eccentric wheel 32 through a cloth feeding crank 24, the feeding shaft 23 which rotates in a reciprocating mode drives a transmission connecting rod assembly, the transmission connecting rod assembly sequentially drives a feeding transmission shaft 22 to rotate in a reciprocating mode through a third crank 26, a transmission connecting rod 28 and a small feeding shaft crank 27 which are movably connected in sequence, the feeding transmission shaft 22 which rotates in a reciprocating mode drives a feeding transmission crank 21 to swing in a reciprocating mode, the feeding transmission crank 21 which swings in the reciprocating mode pulls a feeding connecting rod 20 which is movably connected in a reciprocating mode to move in a reciprocating mode, the feeding connecting rod 20 which moves in the reciprocating mode is matched with a first shaft hole 43 of the tooth frame base 4 through a second rotating shaft 201, the tooth frame base 4 is pulled to move in the reciprocating mode to generate feeding movement, and cloth feeding movement is achieved. Because the feeding connecting rod 20 is movably arranged on the feeding transmission crank 21, and the feeding connecting rod 20 is matched with the shaft hole of the tooth frame seat 4, when the feeding connecting rod 20 is pulled by the feeding transmission crank 21, the feeding connecting rod 20 pulls the tooth frame seat 4 to move, and the feeding connecting rod and the tooth frame seat 4 do not interfere with the reciprocating motion of the upper and lower transmission mechanisms.

The tooth frame seat 4 can realize the reciprocating operation of the upper, lower, front and back according to the preset feeding path under the combined action of the upper and lower transmission mechanisms 1 and the transverse transmission mechanism 2. The feeding teeth 5 are driven by the tooth frame base 4 to feed cloth according to a preset path.

Preferably, the initial feeding position or/and the stroke of the feeding tooth 5 can be adjusted by the adjusting block 85 of the feeding swing plate assembly 8 and the adjusting connecting rod assembly 84 driving the movably connected feeding swing seat 82, so that the sewing needle pitch can be adjusted. Specifically, the adjusting block 85 is adjusted manually or mechanically, the adjusting link assembly 84 drives the movably connected feeding swing seat 82 to rotate, and since the feeding short swing plate 80 and the feeding long swing plate 29 are coaxially mounted through the first rotating shaft, the movable track of the feeding long swing plate 29 can be changed by the rotating feeding swing seat 82 through the feeding short swing plate 80, so that the track of the feeding long swing plate 29 driven by the feeding link 25 is changed, and finally, the stroke, the initial position or/and the speed of the feeding tooth 5 are/is changed.

The utility model discloses the mechanism is still including installing stationary knife 1a on bottom plate member 6, with stationary knife 1a cooperate the trimming move sword 2a, move tool turret 3a, connect and move rotatory ring 4a of tool turret 3a, lie in rotatory ring 4a one side, rotatable trimming transmission shaft 5a of installing on bottom plate member 6, rotatory ring 4a and trimming transmission shaft 5a between be equipped with first transmission structure, drain pan 61 on be equipped with driving motor 51a, driving motor 51a and trimming transmission shaft 5a between be equipped with the second transmission structure. The fixed knife 1a and the movable knife 2a matched with each other are usually arranged between corresponding positions below the needle plate and above the rotating shuttle, when a thread cutting action is required or the thread cutting action is finished, the driving motor 51a is combined with the second transmission structure to drive the thread cutting transmission shaft 5a, the thread cutting transmission shaft 5a drives the rotating ring 4a through the first transmission structure, the rotating ring drives the movable knife 2a to generate the thread cutting action through the movable knife rest 4, the movable knife 2a slides relative to the knife edge of the fixed knife 1a and is matched with the fixed knife 1a, and after the thread cutting action is finished, the driving motor 51a drives the movable knife 2a to reset. The thread cutting transmission shaft 5a is arranged below one feed lifting tooth shaft, and the feeding transmission shaft 22 is arranged below the other feed lifting tooth shaft.

In this embodiment, the first transmission structure includes a driven gear 11 disposed on the rotating ring 4a and a driving gear 12 disposed at a corresponding position on the trimming transmission shaft 5 a.

The rotating ring 4a is sleeved on the lower shaft 41a, and a bearing or a rotating sleeve is arranged between the rotating ring 4a and the lower shaft 41 a. The lower shaft 41a is generally used for coupling to a rotary hook. The rotating ring 4a may be disposed coaxially with the lower shaft 41 a. The trimming transmission shaft 5a may be disposed parallel to the lower shaft 41 a.

The trimming transmission shaft 5a is arranged on the bottom plate member 6 through a rotating sleeve or a bearing.

In order to simplify and reduce the movable knife rest 3a and the rotating ring 4a, the movable knife rest 3a comprises a connecting handle 21a for installing the movable knife 2a and a bent arm part 22a for connecting the connecting handle 21a and the rotating ring 4 a. The connecting handle 21a and the bent arm portion 22a are provided to meet the transmission requirement, so that the rotating ring 4a and the moving blade holder 3a can be made more lightweight.

The second transmission structure comprises a belt wheel assembly 52a or/and a transmission gear assembly arranged between the trimming transmission shaft 5a and the driving motor 51 a. The pulley assembly 52a comprises a driven pulley arranged on the trimming transmission shaft 5a, a driving pulley on the motor shaft of the driving motor 51a, and a synchronous belt connecting the driven pulley and the driving pulley.

The driving motor 51a is arranged inside the bottom shell 61; the bottom case 61 is provided with a motor support 62, and the driving motor 51a is mounted on the motor support 62.

Referring to fig. 3 and 5, as a further preferred option, the movable blade 2a is configured as an arc-shaped movable blade which is wound around the rotating shuttle and is matched with the fixed blade 1 a. The fixed knife 1a is an arc fixed knife wound around the rotating shuttle and matched with the movable knife 2a. The arc-shaped fixed knife 1a and the arc-shaped movable knife 2a can better adapt to the rotating shuttle, so that the whole structure is kept compact, and the rotating shuttle can be conveniently arranged in the bottom plate component 6.

The movable blade 2a for trimming has a simple and compact driving structure, the movable blade 2a is driven by the trimming transmission shaft 5a and the rotating ring 3a, the length of the trimming transmission shaft 5a can be adjusted according to needs so as to adapt to the transmission distance, the length of a small nozzle can be completely adapted to needs to be increased, and the requirements of special sewing are met.

Claims (10)

1. The small-mouth type feeding tooth driving mechanism of the sewing machine comprises a feeding tooth and a tooth frame seat, and is characterized in that: the upper and lower transmission mechanisms are used for driving the tooth rack seat to move up and down, each upper and lower transmission mechanism comprises a pair of tooth lifting shafts which are rotatably arranged on the bottom plate component, a driving connecting rod component for driving the pair of tooth lifting shafts to rotate, a second crank and a tooth lifting connecting rod for driving the second crank, a conversion sliding block is movably and eccentrically arranged at the end, corresponding to the tooth rack seat, of each tooth lifting shaft, or a conversion shaft is eccentrically arranged at the end, corresponding to the tooth rack seat, of each tooth lifting shaft, and a guide sliding structure is arranged between each conversion sliding block or each conversion shaft and the tooth rack seat; the driving connecting rod assembly comprises a first crank and a pair of driving connecting rods, one end of each driving connecting rod is movably connected with the other end of the feed lifting rock shaft, the other ends of the pair of driving connecting rods are movably connected with the first crank, and a crank connecting shaft is arranged between the first crank and the second crank; the transverse transmission mechanism is used for driving the tooth rack seat to transversely move and comprises a feeding shaft, a feeding transmission crank, a feeding connection connecting rod movably arranged on the feeding transmission crank and used for driving the tooth rack seat to transversely move and a feeding transmission shaft which is arranged on the bottom plate component in a reciprocating rotation and rotatable manner and used for driving the feeding transmission crank to reciprocate, the feeding shaft is connected with a cloth feeding crank, the cloth feeding crank is connected with the feeding connection rod, a transmission connecting rod assembly for transmitting power is arranged between the feeding shaft and the feeding transmission shaft, the tooth rack seat is provided with an accommodating groove for accommodating the feeding transmission crank and the feeding connection connecting rod, and the feeding connection connecting rod is rotatably connected with one side wall of the accommodating groove; the driving mechanism is used for providing power, driving the upper and lower transmission mechanisms and the transverse transmission mechanism to coordinately drive the feeding teeth to act, and comprises a first cam or eccentric wheel and a second cam or eccentric wheel which are arranged on the same driving shaft, wherein the first cam or eccentric wheel is matched with the upper end of the feed lifting connecting rod, and the second cam or eccentric wheel is matched with the upper end of the feed feeding connecting rod.

2. The sewing machine beak feed dog drive mechanism as set forth in claim 1, wherein: the driving mechanism comprises a first eccentric wheel or/and a second eccentric wheel, and the eccentric wheel is provided with an outer ring connected with a corresponding connecting rod.

3. The sewing machine beak feed dog drive mechanism as recited in claim 1, wherein: the first cam or eccentric wheel and the second cam or eccentric wheel are arranged on the same driving shaft; the sewing machine is characterized by further comprising a fixed knife and a movable knife which are matched with each other, wherein the movable knife is provided with a movable knife holder, the movable knife holder is connected with a rotating ring, a base plate member is positioned on one side of the rotating ring and is rotatably provided with a thread cutting transmission shaft, a first transmission structure is arranged between the thread cutting transmission shaft and the rotating ring, a driving motor is arranged on a bottom shell of the sewing machine, and a second transmission structure is arranged between the driving motor and the thread cutting transmission shaft; the thread cutting transmission shaft is arranged below one feed lifting tooth shaft, and the feeding transmission shaft is arranged below the other feed lifting tooth shaft.

4. The sewing machine beak feed dog drive mechanism as set forth in claim 1, wherein: the crank connecting shaft and the feeding shaft are rotatably arranged on the bottom shell; the crank connecting shaft, the feeding shaft, the feed lifting shaft or the feed transmission shaft are provided with rotating sleeves or bearings.

5. The sewing machine beak feed dog drive mechanism as set forth in claim 1, wherein: the pair of feed lifting shafts and the pair of driving connecting rods are arranged on two sides of the lower shaft, the pair of driving connecting rods are arc-shaped bent connecting rods, and the lower ends of the pair of driving connecting rods are rotatably connected with the first crank; the lower shaft is arranged between the pair of driving connecting rods.

6. The sewing machine beak feed dog drive mechanism as recited in claim 1, wherein: the sliding structure of direction including setting up in the guide slot that slides of dental articulator seat both sides, conversion slider or conversion shaft slide and set up in the guide slot that slides.

7. The sewing machine beak feed dog drive mechanism as set forth in claim 1, wherein: the tooth lifting shaft is provided with a conversion handle at the corresponding end of the tooth frame seat, and the conversion sliding block is movably arranged on the conversion handle or the conversion shaft is arranged on the conversion handle; the transmission connecting rod assembly comprises a third crank movably arranged on the feeding shaft and a feeding small shaft crank movably arranged at one end corresponding to the feeding transmission shaft, and a transmission connecting rod is movably connected between the feeding small shaft crank and the third crank; and a small-shaft feed lifting crank is further connected between each driving connecting rod and the corresponding feed lifting shaft, the small-shaft feed lifting crank is arranged on the feed lifting shaft, and the other end of the small-shaft feed lifting crank is movably connected with the driving connecting rod.

8. The sewing machine beak feed dog drive mechanism as recited in claim 1, wherein: the feeding swing plate assembly is connected with the cloth feeding crank to adjust the stroke position of the feeding teeth, a feeding long swing plate is rotationally connected between the cloth feeding crank and the feeding connecting rod, and the feeding long swing plate is coaxially connected with a first rotating shaft which is rotationally connected with the feeding connecting rod and arranged in the feeding swing plate assembly; the feeding long swinging plates can be arranged in a pair, the corresponding end of the feeding connecting rod is clamped at the corresponding end between the feeding long swinging plates, and the cloth feeding crank is clamped at the corresponding other end between the feeding long swinging plates.

9. The sewing machine beak feed dog drive mechanism as set forth in claim 8, wherein: the feeding swing plate assembly comprises a feeding short swing plate, a needle tool regulator and a feeding swing seat which is rotatably arranged on the bottom plate component, the feeding swing seat is provided with a groove, one end of the feeding short swing plate is rotatably arranged on the inner wall of the groove of the feeding swing seat, and the other end of the feeding short swing plate is rotatably connected to the outer side of the first rotating shaft; the feeding short swing plates are provided with a pair, and the pair of feeding short swing plates are clamped at the outer sides of the pair of feeding long swing plates; the feeding swing plate assembly further comprises a manual adjusting structure.

10. The drive mechanism for a looper feed dog of a sewing machine as claimed in claim 1, 7 or 8, wherein: the movable connection is a rotary connection.

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