CN213624651U

CN213624651U - Tow boat lazytongs and sewing machine

Info

Publication number: CN213624651U
Application number: CN202022020706.8U
Authority: CN
Inventors: 李永岗; 洪剑
Original assignee: Taizhou Senrui Precision Machinery Co ltd
Current assignee: Taizhou Senrui Precision Machinery Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-07-06
Anticipated expiration: 2030-09-15

Abstract

The utility model discloses a tow boat lazytongs and contain sewing machine, sewing machine technical field of this kind of mechanism. A tug synchronizing mechanism comprises a tug assembly, wherein the tug assembly comprises a cloth pulling wheel, one end of the cloth pulling wheel is connected with a swing fork connecting part along the radial direction of the cloth pulling wheel, and the swing fork connecting part is used for driving the cloth pulling wheel to rotate through swinging; the swing fork is sleeved outside the presser foot swing shaft; two ends of the pendulum fork extend and are respectively formed with a tug connecting part and a lifting shaft connecting part; a driving part is arranged at one end of the connecting part of the lifting shaft, the driving part is arranged at the outer side of the presser foot lifting shaft, and the driving part is used for swinging along with the rotation of the presser foot lifting shaft and driving the connecting part of the lifting shaft to swing; the tow boat connecting part is hinged to the swing fork connecting part, and the tow boat connecting part swings through the swinging of the lifting shaft connecting part, so that the swing fork connecting part is driven to swing and the mop wheel is driven to rotate. The mop can be synchronously moved with the direction of the presser foot to realize the operation with the mop, and the synchronism is good.

Description

Tow boat lazytongs and sewing machine

Technical Field

The utility model belongs to the technical field of sewing machine, refer in particular to a tow boat lazytongs and contain sewing machine of this kind of mechanism.

Background

At present, a sewing machine is a tool for combining cut pieces into ready-made clothes, and is a core product in the garment manufacturing industry. In the process of actually using the sewing machine, a worker must hold the unsewn cloth with one hand and drag the sewn cloth to a distance with the other hand ceaselessly, and the cloth is placed to be squeezed to cause sewing blockage. But this has the problem that no one hand can be used exclusively for rotating the panel with the panel trajectory. This affects sewing efficiency and productivity. In addition, even in some sewing occasions where the curtain is manufactured or stitches are simple, the use mode in the prior art inevitably causes low production efficiency.

In order to solve the technical problem, a mop wheel scheme is provided. For example, the Chinese patent is as follows: 201310754332.4, patent name: a rear tug device of a sewing machine. The utility model discloses a rear tug device of sewing machine, belongs to mechanical technical field. The problems that an existing rear tug is large in occupied area, complex in installation and troublesome in debugging synchronization are solved. The rear tug device of the sewing machine comprises a rear tug, a power mechanism used for driving the rear tug to lift and a linkage mechanism used for driving the rear tug to lift along with the lifting of a presser foot component, wherein a vertical shaft which is vertically arranged and a rear tug wrench which can independently drive the rear tug to lift are arranged on the rear tug, the power mechanism is arranged between a main shaft and the vertical shaft, and the linkage mechanism is arranged between the presser foot component and the rear tug and is connected with a knee lifting rod. The rear tug can be lifted alone through the rear tug spanner, the pull rod is carried to the accessible knee again and goes up and down, can also control the linkage of rear tug and go up and down through lifting the presser foot subassembly, and the drive mode is various, has good practicality.

The above patent does provide a tug to solve the problem of work efficiency, but is not suitable for the type of synchronous vehicle in the first place, and the process of realizing synchronization is too cumbersome, the structure is too complex, and in actual use, the effect of synchronization is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a stable in structure, equipment convenience, the trailing wheel lazytongs that is synchronous effectual to and use sewing machine's technical scheme with this kind of trailing wheel lazytongs.

The purpose of the utility model is realized like this: a tug synchronizing mechanism, which comprises

The mop wheel assembly comprises a mop wheel, one end of the mop wheel is connected with a swing fork connecting part along the radial direction of the mop wheel, and the swing fork connecting part is used for driving the mop wheel to rotate through swinging;

the swinging fork is sleeved on the outer side of the presser foot swinging shaft; two ends of the pendulum fork extend and are respectively formed with a tug connecting part and a lifting shaft connecting part;

a driving part is arranged at one end of the connecting part of the lifting shaft, the driving part is arranged at the outer side of the presser foot lifting shaft, and the driving part is used for swinging along with the rotation of the presser foot lifting shaft and driving the connecting part of the lifting shaft to swing;

the tow boat connecting part is hinged to the swing fork connecting part, and the tow boat connecting part swings through the swinging of the lifting shaft connecting part, so that the swing fork connecting part is driven to swing and the mop wheel is driven to rotate.

Preferably, a presser foot swing crank is slidably arranged on the lifting shaft connecting part, and the driving part is the presser foot swing crank; the presser foot swinging crank is sleeved on the outer side of the presser foot lifting shaft and swings along with the rotation of the presser foot lifting shaft; the lower end of the presser foot swinging crank is hinged with the connecting part of the lifting shaft.

Preferably, a sliding groove is formed in the connecting portion of the lifting shaft, a sliding rod is connected to the lower end portion of the presser foot swinging crank, and the sliding rod is slidably inserted into the sliding groove.

Preferably, the upper end of the presser foot swing crank is formed with an installation hole, one side of the installation hole is formed with a clamping groove, and the fastening piece penetrates through the clamping groove to clamp the presser foot lifting shaft.

Preferably, an included angle is formed between the tug connecting part and the lifting shaft connecting part, and the included angle ranges from 60 degrees to 180 degrees.

Preferably, a limiting groove is formed in the tug connecting portion, a push rod is formed at the upper end of the swing fork connecting portion, and the push rod penetrates through the limiting groove in a sliding mode.

Preferably, a clamping groove is formed in one side of the limiting groove and is located at the lower portion of the limiting groove.

Preferably, the swing fork connecting part at least comprises a vertical rod, and the push rod is perpendicular to the vertical rod; the lower extreme of pole setting articulates there is the horizontal pole, and the radial direction cover in horizontal pole outer end is equipped with the driving lever, and the pivot is connected to the driving lever and the driving lever is perpendicular with the pivot, and the mop wheel cover is established outside the pivot.

A sewing machine comprising the tug synchronizing mechanism of any one of the above; the sewing machine also comprises a machine shell, a presser foot lifting shaft is arranged on the outer side of the machine shell, and a swing fork rotating frame is arranged at the lower end of the presser foot lifting shaft and is installed on the machine shell; the swing fork rotating frame is used for swinging the swing fork.

Preferably, the swing fork rotating frame comprises a presser foot swing shaft; the lower end of the presser foot lifting shaft is provided with a presser foot swinging shaft, and the presser foot swinging shaft and the presser foot lifting shaft are used for driving the presser foot and the machine needle to move periodically; the swing fork is sleeved on the outer side of the presser foot swing shaft; the lifting shaft connecting part is sleeved on the outer side of the presser foot swinging shaft.

Preferably, one side of the machine shell is provided with a tug lifting electromagnet and a first connecting rod, the first connecting rod is rotatably arranged on the machine shell, and one end of the tug lifting electromagnet abuts against the lower end of a rotating fulcrum of the first connecting rod; the upper end of the rotating fulcrum of the first connecting rod is abutted against a second connecting rod, and the second connecting rod is connected with a tug assembly.

Preferably, the swing fork rotating frame comprises a concave bracket, the swing fork and the bracket are coaxially arranged in the length direction, and a shaft simultaneously penetrates through the swing fork and the bracket.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

this technical scheme utilizes the current structure of synchro car, on the basis that does not change original structure, ingenious through presser foot lift shaft and these two axles of presser foot oscillating axle come as the carrier of output synchro car motion, utilize parts such as fork to realize being connected between synchro car and the current tug subassembly. The technical scheme obtained in the way ingeniously utilizes the reverse synchronization of the feeding rhythm of the existing presser foot and the sewing needle of the sewing machine to the movement of the mop wheel. Therefore, when the presser foot and the teeth are matched for feeding, the cloth dragging wheel just swings to realize synchronous cloth dragging. The design has good synchronization effect, and the later modification is convenient because the original synchronous vehicle structure is not changed.

Simultaneously the utility model discloses except can being applicable to the synchronous car, can also realize the same function through external support, as long as have the presser foot lift axle can, the commonality is high like this, and specially adapted repacking to practice thrift the cost.

Drawings

FIG. 1 is one of the schematic structural diagrams of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a second simplified structural diagram of the present invention;

FIG. 4 is an exploded view of a presser foot lift portion of a prior art synchronous machine;

FIG. 5 is a schematic structural view of a fork in the seventh embodiment.

In the figure:

1-a tug assembly; 11-a mop wheel; 12-a pendulum fork connection; 13-a push rod; 14-erecting a rod; 15-a deflector rod;

16-a second link; 17-a cross bar;

2-a pendulum fork; 21-a tug connection; 22-lifting shaft connection 23-runner; 24-a limit groove; 25-a card slot;

3-presser foot swing shaft; 4-presser foot lifting shaft;

5-presser foot swing crank; 51-a slide bar; 52-a clamping groove;

6-a machine shell; 7-presser foot; 8-machine needle; 9-tug lifting electromagnet; 10-first link.

Detailed Description

The invention will be further described with reference to specific embodiments.

The first embodiment is as follows: as shown in figures 1-3, a tug synchronizing mechanism comprises

The mop assembly comprises a mop wheel assembly 1, wherein the mop wheel assembly 1 comprises a mop wheel 11, one end of the mop wheel 11 is connected with a swing fork connecting part 12 along the radial direction of the mop wheel, and the swing fork connecting part 12 is used for driving the mop wheel 11 to rotate through swinging;

the swing fork 2 is sleeved outside the presser foot swing shaft 3; two ends of the pendulum fork 2 extend and are respectively formed with a tug connecting part 21 and a lifting shaft connecting part 22;

a driving part is arranged at one end of the lifting shaft connecting part 22, the driving part is arranged at the outer side of the presser foot swinging shaft 3, and the driving part is used for swinging along with the rotation of the presser foot swinging shaft 3 and driving the lifting shaft connecting part 22 to swing;

the tug connecting part 21 is hinged with the swing fork connecting part 12, and the tug connecting part 21 swings through the swinging of the lifting shaft connecting part 22, so that the swing fork connecting part 12 is driven to swing and the mop wheel 11 is driven to rotate.

The technical scheme specifically discloses a tug synchronizing mechanism. In the present embodiment, the presser foot swing shaft 3, the presser foot lifting shaft 4 and other components are common and general components in the synchronous machine product, and the specific installation position and corresponding function are shown in fig. 4. The position and function of the two components can be known to those skilled in the art, and will not be described in detail herein.

In the present embodiment, the structure of the swing fork connecting portion 12 may be designed as long as it can be connected to the mop wheel 11 and can convert the rotation of the swing fork connecting portion 12 itself into the rotation of the mop wheel 11. The specific implementation mode is at least that the swing fork connecting part 12 is designed into a fork-shaped part, one end of the fork is provided with a rectangular notch, two planes are milled at two ends of the rotating shaft of the mop wheel 11 respectively, and the swing fork connecting part 12 can be driven to rotate through swinging by clamping the two planes through the fork.

In the present embodiment, the mop wheel 11 has a function of rolling in one direction, so that a smoother mop operation can be achieved during the reciprocating movement. The function of the above-mentioned mop wheel 11 rolling in one direction is already the prior art, and will not be described in detail here.

The design of the fork 2 is, in this embodiment, a "V" shaped design. The two sides of the V shape correspond to the connecting part 21 of the towing wheel and the connecting part 22 of the lifting shaft, the connecting part 21 of the towing wheel and the connecting part 22 of the lifting shaft is provided with a cylindrical columnar part, a hole is arranged in the columnar part, the presser foot swinging shaft 3 passes through the hole and props against the presser foot swinging shaft 3 through a fastener passing through the columnar part, and the synchronous rotation with the presser foot swinging shaft 3 is realized.

In connection with the presser foot lifting shaft 4 and the swing fork 2, a driving member is required to convert the rotation of the presser foot lifting shaft 4 into the swing to drive the swing of the lift shaft connecting portion 22, and finally the swing of the swing fork 2 is realized. In an embodiment, a presser foot swing crank 5 is slidably disposed on the lifting shaft connecting portion 22, and the driving member is the presser foot swing crank 5; the presser foot swinging crank 5 is sleeved on the outer side of the presser foot lifting shaft 4 and swings along with the rotation of the presser foot lifting shaft 4; the lower end of the presser foot swing crank 5 is hinged to the lifting shaft connecting part 22.

As shown in fig. 3, the presser foot swing crank 5 according to the embodiment has an installation hole formed at the upper end thereof, a clamping groove 53 formed at one side of the installation hole, and a fastener not shown in the figure passes through the clamping groove 53 to clamp the presser foot lifting shaft 4 by the presser foot swing crank 5, thereby realizing the synchronous rotation with the presser foot lifting shaft 4.

Preferably, a sliding groove 23 is formed on the lifting shaft connecting portion 22, a sliding rod 51 is connected to a lower end portion of the presser foot swing crank 5, and the sliding rod 51 is slidably inserted into the sliding groove 23. By providing the slide rod 51 in the slide groove 23, it is possible to achieve that the reciprocating swing of the presser foot swing crank 5 allows the lifting shaft connecting portion 22 to follow the reciprocating swing. The reason for this is that the movement of the presser foot lifting shaft 4 itself is a periodic reciprocating movement. Therefore, the mop wheel is driven to move reversely through the periodic movement of the existing synchronous vehicle, so that the mop wheel can be matched with the existing synchronous vehicle to realize the mop operation of the mop wheel and the synchronous mop operation of the synchronous vehicle, and the synchronous performance and the effect are best.

Preferably, the tug attachment 21 and the lifting shaft attachment 22 are at an angle in the range of 60 ° to 180 °. Such contained angle design can let 4 pivoted angles of presser foot lift axle and tow boat pivoted length can be better the distance of synchronous car work feed of adaptation to let equipment operation get up more flow.

In the embodiment, as a preferable technical scheme, the included angle is selected to be 75-85 degrees, and the angle selection can be matched with the structure of the existing automatic towing wheel. In the angle range, as the preferred scheme, 80-82 degrees is adopted, the angle design is most suitable for the existing lifting tug mechanism, on one hand, the matching can reduce the motion stroke of the push rod 13, and in addition, the lifting height of the tug 11 can be ensured.

Preferably, a limit groove 24 is formed on the tug connecting portion 21, a push rod 13 is formed at the upper end of the swing fork connecting portion 12, and the push rod 13 slidably penetrates through the limit groove 24. Preferably, a clamping groove 25 is formed at one side of the limiting groove 24, and the clamping groove 25 is located at the lower part of the limiting groove 24.

The technical scheme specifically discloses a specific connection mode between the tug connecting part 21 and the swing fork connecting part 12. The structure is similar to the driving structure between the presser foot swinging crank 5 and the lifting shaft connecting part 22. The difference lies in that on this basis again, has increased draw-in groove 25, draw-in groove 25 is located thereby can be when the motion stroke of push rod 13 has exceeded the design value after, thereby can be through realizing spacingly in draw-in groove 25, place transition swing and lead to spare part to damage.

Preferably, the swing fork connecting part 12 at least comprises a vertical rod 14, and the push rod 13 is perpendicular to the vertical rod 14; the lower extreme of pole setting 14 articulates there is horizontal pole 17, and the radial direction cover in horizontal pole 17 outer end is equipped with driving lever 15, and driving lever 15 connects the pivot and driving lever 15 is perpendicular with the pivot, and the mop wheel 11 cover is established outside the pivot.

The technical scheme specifically discloses a technical scheme of a swing fork connecting part 12, and an L-shaped structural design is formed between a push rod 13 and an upright rod 14, between the upright rod 14 and a cross rod 17, between the cross rod 17 and a deflector rod 15 and between the deflector rod 15 and a rotating shaft, so that the L-shaped structural design is finally converted into the rotation of a mop wheel 11.

A synchronous vehicle, comprising the tug synchronizing mechanism of any one of the above parts; the synchronous machine further comprises a machine shell 6, a presser foot lifting shaft 4 is arranged on the outer side of the machine shell 6, a presser foot swinging shaft 3 is arranged at the lower end of the presser foot lifting shaft 4, and the presser foot swinging shaft 3 and the presser foot lifting shaft 4 are used for driving a presser foot 7 and a machine needle 8 to move periodically; the swing fork 2 is sleeved on the outer side of the presser foot swing shaft 3; the lifting shaft connecting part 22 is sleeved outside the presser foot swing shaft 3.

The technical scheme specifically explains the installation position of the tug synchronizing mechanism from the angle of the synchronizing vehicle. In the technical field of synchronous machine, under the action of the presser foot lifting shaft 4 and the presser foot swinging shaft 3, the feed dog and the presser foot 7 are matched to realize the feeding effect, so that the tug synchronizing mechanism obtained by the technical scheme can realize the synchronization with the synchronous machine feed rhythm to the maximum extent. And because the size of the part product is fixed, the part product can be directly used without angle adjustment or debugging after the installation, and the assembly difficulty is greatly simplified.

Preferably, a tug lifting electromagnet 9 and a first connecting rod 10 are arranged on one side of the machine shell 6, the first connecting rod 10 is rotatably arranged on the machine shell 6, and one end of the tug lifting electromagnet 9 abuts against the lower end of a rotating fulcrum of the first connecting rod 10; the upper end of the rotating fulcrum of the first connecting rod 10 is abutted against a second connecting rod 16, and the second connecting rod 16 is connected with the tug wheel assembly 1.

This technical scheme specifically discloses a technical scheme who utilizes electromagnet to realize lifting the tow boat automatically, and such design can utilize signal control electro-magnet work when not needing the cam to carry out the mop operation to promote the tow boat, such functional design is more humanized.

Example two: the present embodiment is basically the same as the first embodiment, and the difference is: the driving member is a cam, and the center of rotation of the cam is at the center of the cam. The outer edge of the cam abuts against the lifting shaft connection 22. So that the amplitude of the oscillation of the lift shaft connecting portion 22 can be controlled by the change in the curvature of the cam outer surface. In addition, in order to realize the automatic resetting of the lifting shaft connecting part 22, a hole may be formed in the axial direction of the cam, and the wire rope may be passed through the hole and the sliding groove 23 at the same time, thereby realizing the automatic resetting. Or both the cam and the lift shaft connecting portion 22 are provided as magnetic members so that the attraction is achieved by magnetic force.

Example three: the present embodiment is basically the same as the second embodiment, and the difference is that: the driving member is an eccentric wheel which is circular in shape but whose axis of rotation is not at its centre of circle, thereby also allowing the lifting shaft connection 22 to oscillate in response to rotation of the presser foot lifting shaft 4.

Example four: the present embodiment is basically the same as the first embodiment, and the difference is: an included angle is formed between the tug connecting part 21 and the lifting shaft connecting part 22, and the included angle ranges from 60 degrees to 80 degrees. The smaller included angle enables the angle of the limiting groove 24 to be a naturally descending angle, so that the swing fork can swing more smoothly.

Example five: the present embodiment is basically the same as the first embodiment, and the difference is: an included angle is formed between the towing wheel connecting part 21 and the lifting shaft connecting part 22, the included angle range is between 120 degrees and 180 degrees, and a larger angle can be realized and a larger lifting height can be obtained by swinging the swing fork 2 by a smaller angle, so that the device can be more adaptive to the existing mop wheel lifting device.

Example six: the present embodiment is basically the same as the first embodiment, and the difference is: the swing fork rotating frame comprises a concave-shaped support, the swing fork 2 and the support are coaxially arranged in the length direction, and a shaft penetrates through the swing fork 2 and the support simultaneously.

In the embodiment, the shell adopts a double-pin shell, in particular a Mitsubishi double-pin shell. The existing design of the machine shell has a presser foot lifting shaft 4 which is the same as that of a synchronous machine, but does not have a presser foot swinging shaft 3 in the synchronous machine. However, in the embodiment, one of the cores of the presser foot swing shaft 3 is used for the swing fork to pass through and is used as a rotating shaft.

Therefore, in order to apply the tug synchronizing mechanism to the double-folded casing, the swinging fork rotating frame can comprise a concave bracket design outside the casing, and the same shaft penetrates through the swinging fork and two convex parts of the concave bracket. Thus, a 'presser foot swinging shaft' can be artificially generated, thereby realizing the synchronous effect.

Example seven: the present embodiment is basically the same as the first embodiment, and the difference is: the sliding groove 23 of the swing fork 2 in the technical scheme is provided with an opening and is not closed, so that the design has the advantage of convenience in installation.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a tow boat lazytongs which characterized in that: comprises that

The mop wheel assembly (1), the mop wheel assembly (1) comprises a mop wheel (11), one end of the mop wheel (11) is connected with a swing fork connecting part (12) along the radial direction, and the swing fork connecting part (12) is used for driving the mop wheel (11) to rotate through swinging;

the swing fork (2) is arranged on the outer side of the shell (6) in a swinging mode through the swing fork rotating frame; two ends of the pendulum fork (2) respectively extend and are formed with a tug connecting part (21) and a lifting shaft connecting part (22);

a driving piece is arranged at one end of the lifting shaft connecting part (22), the driving piece is arranged on the outer side of the presser foot lifting shaft (4), and the driving piece is used for swinging along with the rotation of the presser foot lifting shaft (4) and driving the lifting shaft connecting part (22) to swing;

the tug connecting part (21) is hinged with the swing fork connecting part (12), and the tug connecting part (21) swings through the swinging of the lifting shaft connecting part (22), so that the swing fork connecting part (12) is driven to swing and the mop wheel (11) is driven to rotate.

2. The tug synchronizing mechanism of claim 1, wherein: a presser foot swing crank (5) is arranged on the lifting shaft connecting part (22) in a sliding manner, and the driving part is the presser foot swing crank (5); the presser foot swinging crank (5) is sleeved on the outer side of the presser foot lifting shaft (4) and swings along with the rotation of the presser foot lifting shaft (4); the lower end of the presser foot swinging crank (5) is hinged with the lifting shaft connecting part (22).

3. The tug synchronizing mechanism of claim 2, wherein: a sliding groove (23) is formed in the lifting shaft connecting portion (22), a sliding rod (51) is connected to the lower end portion of the presser foot swinging crank (5), and the sliding rod (51) is slidably arranged in the sliding groove (23) in a penetrating mode.

4. The tug synchronization mechanism of claim 2 or 3, wherein: the upper end of the presser foot swing crank (5) is provided with a mounting hole in a molding mode, a clamping groove (53) is formed in one side of the mounting hole, and the fastening piece penetrates through the clamping groove (53) to clamp the presser foot lifting shaft (4) through the presser foot swing crank (5).

5. The tug synchronizing mechanism of claim 2, wherein: an included angle is formed between the tug connecting part (21) and the lifting shaft connecting part (22), and the included angle ranges from 60 degrees to 180 degrees.

6. The tug synchronizing mechanism of claim 1, wherein: a limiting groove (24) is formed in the tug connecting portion (21), a push rod (13) is formed in the upper end of the swing fork connecting portion (12), and the push rod (13) can slidably penetrate through the limiting groove (24).

7. The tug synchronization mechanism of claim 1 or 6, wherein: the swing fork connecting part (12) at least comprises a vertical rod (14), and a push rod (13) is perpendicular to the vertical rod (14); the lower end of the vertical rod (14) is hinged with a cross rod (17), a shifting rod (15) is sleeved at the outer end of the cross rod (17) in the radial direction, the shifting rod (15) is connected with a rotating shaft, the shifting rod (15) is perpendicular to the rotating shaft, and the rotating shaft is sleeved with a mop wheel (11).

8. A sewing machine characterized by: comprising a tug synchronization mechanism according to any of claims 1-7; the sewing machine further comprises a machine shell (6), a presser foot lifting shaft (4) is arranged on the outer side of the machine shell (6), and a swing fork rotating frame is arranged at the lower end of the presser foot lifting shaft (4) and is installed on the machine shell (6); the swing fork rotating frame is used for swinging the swing fork (2).

9. The sewing machine of claim 8, wherein: the swing fork rotating frame comprises a presser foot swing shaft (3); the lower end of the presser foot lifting shaft (4) is provided with a presser foot swinging shaft (3), and the presser foot swinging shaft (3) and the presser foot lifting shaft (4) are used for driving the presser foot (7) and the needle (8) to move periodically; the swing fork (2) is sleeved on the outer side of the presser foot swing shaft (3); the lifting shaft connecting part (22) is sleeved on the outer side of the presser foot swinging shaft (3).

10. The sewing machine of claim 8, wherein: the swing fork rotating frame comprises a concave-shaped support, the swing fork (2) and the support are coaxially arranged in the length direction, and a shaft penetrates through the swing fork (2) and the support simultaneously.