CN217077993U - Sewing machine - Google Patents

Abstract

The utility model discloses a sewing machine, which relates to the field of sewing equipment and comprises a needle rod, a needle guide and a needle guide, wherein the needle rod is used for installing a needle and driving a needle thread to puncture cloth in a reciprocating manner; the feeding device is provided with a step feeding tooth frame and a step feeding presser foot, and the step feeding tooth frame is matched with the step feeding presser foot to further drive the cloth to move; at least two swing forks which are positioned at the front side of the needle bar, and at least one swing fork is respectively positioned at the left side and the right side of the needle bar; the pendulum fork driving device is used for driving the pendulum fork to reciprocate and cross swing along the direction vertical to the cloth advancing direction; and a synchronizing device for causing the needle bar and the swing fork to move synchronously; wherein, the pendulum fork has at least: the structure can interweave and sew various sewing threads together at the same time, the stitch is beautiful, a decorative stitch is formed, and the beauty of the fabric is improved.

Description

Sewing machine

Technical Field

The utility model belongs to the technical field of fabric processing equipment, refer in particular to a sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. At present, when an existing sewing machine works and needs to gather sewing threads with various colors to a stitch to form a decorative stitch, a technical scheme for realizing corresponding effects does not exist.

For example, the chinese utility model patent discloses a lockstitch sewing machine [ application number: 202021159769.5], this use novel patent include actuating mechanism and the puncture mechanism of being connected with the actuating mechanism drive, actuating mechanism accessible puncture mechanism drive pjncture needle along vertical direction upward reciprocating motion, still including can drive collude the line looper and take place to be close to or keep away from the line mechanism that colludes that pjncture needle axial lead removed, collude the line looper and connect in the one end of colluding the line mechanism and be located the below of pjncture needle, collude the line mechanism and be located the puncture mechanism below, collude and still be equipped with between line mechanism and the puncture mechanism and make the same angular velocity pivoted synchronous drive subassembly of colluding line mechanism and puncture mechanism, synchronous drive subassembly one end is connected with puncture mechanism, and the other end is connected with the line mechanism that colludes. The synchronous driving assembly comprises a first transmission gear fixedly connected to the puncture mechanism and a second transmission gear fixedly connected to the thread hooking mechanism, the synchronous driving assembly further comprises a synchronous transmission rod which is positioned between the first transmission gear and the second transmission gear and two ends of which are respectively meshed with the first transmission gear and the second transmission gear, the puncture mechanism comprises a puncture driving rod which is in driving connection with the driving mechanism, the synchronous driving assembly is connected to the puncture driving rod, one end of the puncture driving rod, far away from the driving mechanism, is fixedly connected with a transmission wheel, the thread hooking mechanism comprises a thread hooking driving rod, the synchronous driving assembly is connected to the thread hooking driving rod, one end of the thread hooking driving rod, close to the puncture needle, is fixedly connected with a looper swinging assembly which can enable the thread hooking looper to swing close to or far away from the axis of the puncture needle, and the thread hooking looper is fixedly connected to the looper swinging assembly, the looper swinging assembly comprises an eccentric wheel and a swinging fork which are connected to a thread hooking driving rod, the bottom end of the swinging fork is rotatably connected with a positioning rod, and the thread hooking looper is fixedly connected to the swinging fork.

The utility model has the frequency of synchronously puncturing the needle bar and feeding the needle, thereby forming a more complete and continuous stitch; the utility model discloses a still have the beneficial effect that reduces pendulum fork vibration amplitude, but it still does not solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims to simultaneously sew a plurality of sewing threads together to enable the sewing threads to be mutually interwoven by using the sewing machine provided by the utility model; the stitch is beautiful and forms a decorative stitch.

The purpose of the utility model is realized like this: a sewing machine, comprising:

the needle rod is used for installing a needle and driving the upper thread to puncture the cloth in a reciprocating manner by utilizing the needle;

the feeding device is provided with a needle plate groove and a step feeding presser foot, and a step feeding tooth frame below the needle plate groove is matched with the step feeding presser foot so as to drive the cloth to move;

at least two swing forks which are positioned at the front side of the needle bar, and at least one swing fork is respectively positioned at the left side and the right side of the needle bar;

the pendulum fork driving device is used for driving the pendulum fork to reciprocate and cross swing along the direction vertical to the cloth advancing direction; and

a synchronizing device for synchronizing the needle bar and the yoke;

wherein, the pendulum fork has at least:

a thread passing part for passing a sewing thread; and

the connecting part is used for connecting the swing fork with the swing fork driving device.

Preferably, the threading part is horizontally arranged at the front side of the needle bar;

and at least part of the connecting part vertically penetrates through the swing fork driving device.

The swing fork driving device at least comprises:

the vertical driving mechanism is used for driving the swinging fork to swing along the direction vertical to the cloth advancing direction; and

and the pushing fork mechanism is used for driving the vertical driving mechanism.

Preferably, the vertical driving mechanism has at least:

at least two fourth connecting rods, wherein at least one end of each fourth connecting rod is hinged with the fork pushing mechanism; and

the at least two turning installation seats are provided with connecting holes used for being connected with the connecting parts, center holes used for being hinged with the sewing machine body and transmission holes used for being externally connected with a fourth connecting rod;

and the vertical driving mechanism is at least provided with a fulcrum shaft matched with the central hole, and the fulcrum shaft simultaneously penetrates through the central holes in the two direction-changing mounting seats.

Preferably, the vertical drive mechanism has at least a third link;

the other end of each fourth connecting rod is hinged with the third connecting rod and is hinged with the fork pushing mechanism through the third connecting rod.

Preferably, the third connecting rods are horizontally arranged and respectively penetrate through and are hinged with the fourth connecting rods;

preferably, a middle portion of the third link is hinged to the fork mechanism in a radial direction thereof.

Preferably, the fork pushing mechanism at least has a transmission set for transmitting the driving force to the vertical driving mechanism;

preferably, the transmission set has at least:

one end of the transmission shaft is sleeved with the synchronizing device and synchronously rotates;

one end of the eccentric wheel is sleeved with the other end of the transmission shaft and synchronously rotates;

one end of the first connecting rod is connected with the other end of the eccentric wheel and moves synchronously; and

and two ends of the second connecting rod are respectively connected with the other end of the first connecting rod and the vertical driving mechanism.

Preferably, the second link has at least:

a link portion hinged to the first link;

a driving part hinged with the vertical driving mechanism; and

a hinge part located between the link part and the driving part and having a shaft simultaneously passing through the hinge part and the link mounting seat so that the second link rotates about the hinge part;

the driving part is arc-shaped as a whole, and the extending direction of the joint of the driving part and the vertical driving mechanism tends to be horizontal.

Preferably, the fork pushing mechanism at least has a mounting group for mounting the transmission group on a shell of the sewing machine;

wherein the mounting group has at least:

at least one supporting plate fixedly arranged on a shell of the sewing machine; and the through hole A is internally provided with a shaft sleeve, and the transmission shaft is arranged in the shaft sleeve in a penetrating way.

Preferably, the sewing machine further comprises:

a main shaft which at least partially penetrates out of the machine body of the sewing machine and forms an exposed shaft part; and

the main motor is used for driving the main shaft to rotate;

wherein the synchronization device has at least:

a first synchronizing wheel which is sleeved with the exposed shaft part and rotates synchronously with the exposed shaft part;

a second synchronizing wheel which rotates synchronously with the swing fork driving device; and

and the belt is used for synchronously driving the first synchronizing wheel and the second synchronizing wheel to rotate.

Compared with the prior art, the utility model has the advantages that:

1. various sewing threads can be simultaneously interwoven and sewn together, the stitch is beautiful, a decorative stitch is formed, and the attractiveness of the fabric is improved.

2. The sewing thread stitch can realize winding of various colors on one stitch.

3. The sewing thread stitch can be changed by adjusting the length of the outer thread section of the outer thread rod end joint bearing in the first connecting rod and the fourth connecting rod extending into the inner thread cavity of the inner thread rod end joint bearing so as to meet the sewing requirements of different fabrics.

4. The second connecting rod driving part is arc-shaped, and the extending direction of the joint of the driving part and the vertical driving mechanism tends to be horizontal, so that the structure can reduce the vertical force applied to the third connecting rod.

5. The bearing plate is internally provided with the shaft sleeve, so that the friction force and the noise generated in the rotating process of the transmission shaft can be reduced, and the stability and the usability of the product are improved.

6. The second connecting rod is hinged on the connecting rod mounting seat, so that the second connecting rod is driven by the main shaft to swing around the hinge part.

7. At least two turning installation groups are arranged and are provided with swing forks, so that a plurality of weaving threads can be sewn simultaneously.

8. The swing fork threading part is horizontally arranged at the front side of the needle rod, so that the sewing thread can repeatedly pass through the machine needle under the driving of the main shaft and the step conveying mechanism.

Drawings

FIG. 1 is a perspective view of an embodiment;

FIG. 2 is an enlarged view of a portion A of the fork drive apparatus according to the embodiment;

FIG. 3 is a schematic diagram of an embodiment of a synchronization apparatus;

FIG. 4 is a schematic view of a fork pushing mechanism according to an embodiment;

FIG. 5 is a schematic diagram of a vertical driving structure according to an embodiment;

FIG. 6 is a trace diagram of an embodiment.

In the figure: 1-sewing machine body; 2-a workbench; 3-an electric control shell; 4-a main shaft; 5-a synchronization device; 51-a first synchronizing wheel; 52-a second synchronizing wheel; 53-belts; 6-a transmission shaft; 7-a bearing plate; 71-shaft sleeve; 8-eccentric wheel; 91-a first link; 92-a second link; 921-link part; 922-a drive section; 923-a hinge portion; 93-a third link; 94-a fourth link; 10-axial position screw; 11-connecting rod mount; 12-a turning mounting seat; 121-center hole; 122-a drive bore; 123-connecting hole; 13-fulcrum shaft; 14-a pendulum fork; 141-threading part; 15-needle bar; 151-machine needle; 16-a needle plate groove; and 17-step feeding presser foot.

Detailed Description

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

The first embodiment is as follows:

the present embodiment provides a sewing machine, as shown in particular in fig. 1-6.

Fig. 1 is a perspective view schematically showing an embodiment, and as shown in fig. 1, the sewing machine in the embodiment has a sewing machine body 1, a table 2, and an electric control housing 3.

As shown in fig. 1, a sewing machine body 1 is provided on a table 2, and an electric control case 3 is provided on the left side of the sewing machine body 1. The outer side of the sewing machine body 1 is provided with a bearing plate 7, the bearing plate 7 is fixedly connected on the long strip plate, and the long strip plate is bolted on the sewing machine body. The center of the bearing plate 7 is provided with a through hole, a shaft sleeve 71 is arranged in the through hole, and the transmission shaft 6 penetrates through the shaft sleeve 71, so that the friction force and the stress load are reduced, the strength of the product is improved, and the service life of the product is prolonged.

As shown in fig. 1, two ends of the transmission shaft 6 are respectively connected with the synchronizer 5 and the eccentric wheel 8. The right side of the eccentric wheel is provided with a first connecting rod 91 which is vertically sleeved on the eccentric wheel 8 through an eccentric hole.

Fig. 2 is an enlarged view of a portion a of a swing fork driving apparatus according to an embodiment, as shown in fig. 1 and 2, a first link 91 is formed by matching an internal thread rod end joint bearing and an external thread rod end joint bearing, a cavity is formed inside the internal thread rod end joint bearing, a countersunk head locking nut is arranged on an outer end surface of the cavity to abut against the internal thread rod end joint bearing, and the length of the first link 91 can be adjusted by adjusting the length of the external thread rod end joint bearing penetrating into the cavity in use.

Two ends of the first connecting rod 91 are respectively connected with the eccentric wheel 8.

The second link 92 has a link portion 921, a driving portion 922, and a hinge portion 923. The link portion 921 is hinged to the first link 91, the driving portion 922 is integrally arc-shaped and hinged to the third link 93, and the extending direction of the driving portion 922 contacting with the third link 93 tends to be horizontal.

Fig. 4 is a schematic view of the fork pushing mechanism, as shown in fig. 1 and 4, an eccentric wheel 8 is arranged at one end of a transmission shaft 6 and sleeved on the transmission shaft 6, and the transmission shaft 6 drives the eccentric wheel 8 to rotate synchronously. The eccentric wheel 8 is provided with a transmission hole and an eccentric hole, the transmission hole is arranged in the center of the eccentric wheel 8, and the transmission shaft 6 penetrates through the eccentric hole and is sleeved with the eccentric wheel 8; the eccentric hole is arranged at the other side of the eccentric wheel 8 opposite to the transmission shaft 6 and is arranged in a deviating way from the center, and a first connecting rod 91 is vertically sleeved on the eccentric wheel 8 through the eccentric hole.

As shown in fig. 2 and 4, the second link 92 is fixed to the link mounting seat 11 by a shaft screw 10 passing through the hinge portion 923, and the second link 92 can only rotate around the hinge portion 923.

The connecting rod mounting seat 11 is fixed on the sewing machine body and is provided with a through hole for mounting the second connecting rod 92 in cooperation with the shaft position screw 10.

The middle part of the third link 93 is hinged to the driving part 922 of the second link 92, and moves left and right with the second link 92 in accordance with the cloth feeding direction, and both ends of the third link 93 are respectively hinged to a fourth link 94.

The two fourth connecting rods 94 have the same structure as the first connecting rod 91, the length of the connecting rods can be adjusted, the other ends of the two fourth connecting rods 94 are respectively connected with one turning mounting seat 12, and the turning mounting seat 12 is pushed to swing under the driving of the third connecting rod 93.

Fig. 5 is a schematic view of a vertical driving structure, and as shown in fig. 2 and 5, the direction-changing mounting base 12 has a connecting hole, a central hole and a transmission hole, and is hinged to the fourth connecting rod 94 through the transmission hole, and a gap is left at the hinged position, so that the fourth connecting rod 94 can slightly move at the joint with the direction-changing mounting base 12, and the stress load is reduced to ensure the stable structure.

As shown in fig. 2 and 5, the sewing machine body 1 is provided with a fulcrum shaft 13 extending out of the machine body, and the fulcrum shaft 13 passes through the central holes of the two direction-changing installation bases 12, so that the two direction-changing installation bases 12 can only swing around the fulcrum shaft 13 in a reciprocating and crossed manner.

The whole pendulum fork 14 is in an L shape, the connecting part of the pendulum fork 14 penetrates through the connecting hole of the direction-changing mounting base 12 to vertically mount the pendulum fork 14 on the direction-changing mounting base 12, and the direction-changing mounting base 12 drives the pendulum fork 14 to swing. And the threading part of the swing fork 14 is penetrated by the sewing thread, so that the sewing thread reciprocates along with the rotation of the main shaft 4.

Meanwhile, a needle 151 is arranged on a needle bar 15 of the sewing machine, a needle plate 2 in fig. 5 is a needle plate, a step feeding rack below a needle plate groove 16 is matched with a step feeding presser foot to continuously press cloth towards the direction of the needle bar, the needle bar drives the needle 151 to puncture the cloth in a reciprocating manner, and the needle bar 15 is driven by a main shaft in the sewing machine body 1 through transmission connection, so that the needle 151 and the swing fork 14 have the same movement period, and when the needle 151 completes a puncture and lifting action, the swing fork 14 also completes a swinging to reset process, so that the needle 151 and sewing threads on the swing fork 14 are mutually interwoven, and beautiful stitches interwoven by various colors are formed.

Fig. 3 is a schematic diagram of a synchronizing device, as shown in fig. 1 and 3, a main shaft 4 extends out of an electric control housing 3 from a sewing machine body 1, a first synchronizing wheel 51 is sleeved at an end portion of the main shaft 4, and the first synchronizing wheel 51 is driven by the main shaft 4 to rotate synchronously.

The belt 53 is sleeved on the first synchronizing wheel 51 and the second synchronizing wheel 52, the first synchronizing wheel 51 and the second synchronizing wheel 52 are synchronously driven to rotate, and the second synchronizing wheel 52 is sleeved on the transmission shaft 6 and drives the transmission shaft 6 to synchronously rotate.

In this embodiment, the first link 91, the second link 92, the third link 93, the fourth link 94, and the transmission shaft 6 may be replaced with other components when in use, as long as the direction-changing mounting base 12 can be driven to swing back and forth around the fulcrum shaft 13, for example, an air cylinder is used to directly push the direction-changing mounting base 12.

The shape of the swing fork 14 can be changed, for example, the swing fork is a rod shape, and is installed on the side of the direction changing installation seat 12 close to the needle bar 15, as long as the threading part is enough relative to the needle bar 15 in the cloth feeding direction.

Example two: the present embodiment is substantially the same as the first embodiment, except that the first synchronous pulley 51 is not sleeved on the main shaft 4, the main shaft 4 does not extend out of the sewing machine body, but a driven shaft is connected with the main shaft 4 through a coupler and rotates synchronously with the main shaft 4, and the first synchronous pulley 51 is sleeved on the driven shaft and rotates synchronously with the driven shaft.

The utility model discloses a theory of operation is: the utility model discloses during the use, start sewing machine, sewing machine main shaft 4 rotates, and the first synchronizing wheel 51 that drives the extension of main shaft 4 and cup joint rotates, thereby another second synchronizing wheel 52 passes through belt 53 and rather than forming the synchronous rotation of transmission. The sewing machine body is externally provided with a long slat, the two bearing plates 7 are bolted on the long slat, the centers of the bearing plates 7 are provided with through holes A and are provided with shaft sleeves 71, the transmission shaft 6 sequentially penetrates through the two shaft sleeves 71, one end of the transmission shaft 6 is sleeved on the second synchronizing wheel 52, the other end of the transmission shaft 6 is sleeved with the eccentric wheel 8, and the transmission shaft 6 synchronously rotates along with the second synchronizing wheel 52 under the influence of the second synchronizing wheel 52. The eccentric wheel 8 is provided with a transmission hole and is sleeved with the transmission shaft 6 through the transmission hole, so that the eccentric wheel 8 and the transmission shaft 6 synchronously rotate, the other side of the eccentric wheel 8 connected with the transmission shaft 6 is provided with an eccentric hole, and the first connecting rod 91 is hinged on the eccentric wheel 8 through the eccentric hole and eccentrically moves along with the eccentric wheel 8. The second connecting rod 92 is hinged to the first connecting rod 91 and can move along with the first connecting rod 91, and a hole is formed in the second connecting rod 92 and is penetrated by a shaft and fixed on a connecting rod mounting seat 11 arranged outside the sewing machine body, so that the second connecting rod 92 can only swing around the shaft point under the driving of the first connecting rod 91. The second link 92 is divided into a link 921 and a driving part 922 by an axis point, the two parts are arranged at an included angle, the driving part 922 is hinged with the middle part of the third link 93, and the driving part 922 is arc-shaped, and the extending direction of the joint of the third link 93 tends to be horizontal, so that the third link 93 only receives the force of the second link 92 in the horizontal direction approximately and does reciprocating motion in the cloth feeding direction. The third connecting rod 93 is connected to a fourth connecting rod 94 at both ends thereof and drives the fourth connecting rod to reciprocate. The fourth link 94 is hinged to the direction-changing mount 12 with a gap left at the hinge to eliminate the residual force in the vertical direction transmitted from the second link 92. The turning installation bases 12 are provided with center holes, and the fulcrum shafts 13 outside the sewing machine body 1 penetrate through the center holes to be connected with the plurality of turning installation bases 12, so that the turning installation bases 12 can only swing around the pointing shafts under the driving of the fourth connecting rods 94, and the swing forks 14 arranged on the turning installation bases 12 are driven to swing around the fulcrum shafts 13. Fundamentally, the needle 151 and the swing fork 14 are both driven by the main shaft 4 through a series of transmission mechanisms, so that the needle 151 and the swing fork 14 have a certain movement period, the needle 151 is fixed on the needle rod 15 and only carries out reciprocating motion in the vertical direction, the swing fork 14 only carries out reciprocating swing around a pointing axis, so that as shown in fig. 6, fig. 6 is a stitch diagram, sewing threads are in a track along with the swing fork 14 and are driven by a step conveying mechanism to move in the direction from B to A, after the needle 151 is penetrated from the point A, the sewing threads on both sides synchronously pass around the needle 151, after the sewing threads on both sides are interwoven, the needle 151 penetrates from the point B, at the same time, the sewing threads synchronously swing in the direction away from the needle 151, the needle repeats circulation, penetrates from the point C, after the sewing threads pass around the needle 151, the needle penetrates from the point D again, and repeats the circulation.

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 (10)

1. A sewing machine, comprising:

a needle rod (15) for installing a needle (151) and driving the needle (151) to puncture the fabric in a reciprocating manner;

the feeding device is provided with a needle plate groove (16) and a step delivery presser foot (17), and a step delivery tooth frame below the needle plate groove (16) is matched with the step delivery presser foot (17) so as to drive the cloth to move;

at least two swing forks (14) which are positioned at the front side of the needle bar (15), and at least one swing fork (14) is respectively positioned at the left side and the right side of the needle bar (15);

the swing fork (14) driving device is used for driving the swing fork (14) to swing in a reciprocating and crossed manner along the direction vertical to the cloth advancing direction; and

a synchronization device (5) for synchronizing the movement of the needle bar (15) and the oscillating fork (14);

wherein the pendulum fork (14) at least comprises:

a thread passing part (141) for passing a sewing thread; and

the connecting part is used for connecting the swing fork (14) with the swing fork (14) driving device.

2. The sewing machine of claim 1,

the threading part (141) is horizontally arranged at the front side of the needle bar (15);

and at least part of the connecting part vertically penetrates through the swing fork driving device.

3. Sewing machine according to claim 1 or 2, characterized in that the oscillating fork (14) drive means have at least:

the vertical driving mechanism is used for driving the swinging fork (14) to swing along the direction vertical to the cloth advancing direction; and

and the pushing fork mechanism is used for driving the vertical driving mechanism.

4. The sewing machine of claim 3, wherein the vertical drive mechanism has at least:

at least two fourth connecting rods (94), wherein at least one end of each fourth connecting rod (94) is hinged with the fork pushing mechanism; and

at least two direction-changing mounting seats (12) are provided with connecting holes (123) used for being connected with the connecting parts, a central hole (121) used for being hinged with the sewing machine body and a transmission hole (122) used for being externally connected with a fourth connecting rod (94);

and the vertical driving mechanism at least is also provided with a fulcrum shaft (13) matched with the central hole (121), and the fulcrum shaft (13) simultaneously penetrates through the central holes (121) on the two direction-changing installation seats (12).

5. Sewing machine as in claim 4, characterized in that said vertical drive mechanism has at least a third link (93);

the other end of each fourth connecting rod (94) is hinged with the third connecting rod (93), and is hinged with the fork pushing mechanism through the third connecting rod (93).

6. Sewing machine as in claim 5, characterized in that said third links (93) are arranged horizontally and respectively pass through said fourth links (94) and are hinged to said fourth links (94);

the middle part of the third connecting rod (93) is hinged with the fork pushing mechanism along the radial direction of the third connecting rod.

7. The sewing machine of claim 3, wherein the fork pushing mechanism has at least a transmission set for transmitting a driving force to the vertical driving mechanism;

the transmission set at least has:

one end of the transmission shaft (6) is sleeved with the synchronizing device (5) and synchronously rotates;

one end of the eccentric wheel (8) is sleeved with the other end of the transmission shaft (6) and synchronously rotates;

a first connecting rod (91) one end of which is connected with the other end of the eccentric wheel (8) and moves synchronously; and

and the two ends of the second connecting rod (92) are respectively connected with the other end of the first connecting rod (91) and the vertical driving mechanism.

8. Sewing machine as in claim 7, characterized in that said second link (92) has at least:

a link section (921) that is hinged to the first link (91);

a driving part (922) hinged with the vertical driving mechanism; and

a hinge portion (923) between the link portion (921) and the driving portion (922), and having a shaft simultaneously passing through the hinge portion (923) and the link mount (11), such that the second link (92) rotates about the hinge portion (923);

the driving part (922) is arc-shaped as a whole, and the extending direction of the joint of the driving part (922) and the vertical driving mechanism tends to be horizontal.

9. The sewing machine of claim 3, wherein the fork pushing mechanism has at least a mounting set for mounting the drive set on a housing of the sewing machine;

wherein the mounting group has at least:

at least one support plate (7) fixedly arranged on the shell of the sewing machine; and the through hole A is internally provided with a shaft sleeve (71), and the transmission shaft (6) penetrates through the shaft sleeve (71).

10. The sewing machine of claim 1, further comprising:

a main shaft (4) which at least partially penetrates out of the machine body of the sewing machine and forms an exposed shaft part; and

the main motor is used for driving the main shaft (4) to rotate;

wherein the synchronization device (5) has at least:

a first synchronizing wheel (51) which is sleeved with the exposed shaft part and rotates synchronously with the exposed shaft part;

a second synchronizing wheel (52) rotating synchronously with the pendulum fork (14) drive; and

and the belt (53) is used for synchronously driving the first synchronous wheel (51) and the second synchronous wheel (52) to rotate.

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