CN219342504U

CN219342504U - Sewing machine

Info

Publication number: CN219342504U
Application number: CN202320350755.9U
Authority: CN
Inventors: 潘兵; 陈美正; 於杰龙
Original assignee: Zhongjie Sewing Machine Co Ltd
Current assignee: Zhongjie Sewing Machine Co Ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-07-14
Anticipated expiration: 2033-02-21

Abstract

The utility model provides a sewing machine, which belongs to the field of sewing machines and comprises a needle plate assembly and a presser foot assembly, wherein the presser foot assembly is movably arranged above the needle plate assembly, and the presser foot assembly is provided with a first initial state pressed on the needle plate assembly and a separation state separated from the needle plate assembly; the feeding tooth component is movably arranged on the needle plate component to move to a second initial state or a sinking state; when the feeding tooth part is in the second initial state, the tooth part of the feeding tooth part protrudes out of the needle plate assembly at a first preset height; when the feeding tooth part is in a sinking state, at least part of the tooth part of the feeding tooth part protrudes out of the needle plate assembly or is positioned below the needle plate assembly at a second preset height smaller than the first preset height; and the feeding tooth transmission mechanism is connected with the feeding tooth component. The sewing machine is simple in structure and convenient to operate, and solves the problem that the discharging space of the sewing machine in the prior art is small.

Description

Sewing machine

Technical Field

The utility model relates to the field of sewing machines, in particular to a sewing machine.

Background

A sewing machine is a machine that interweaves or sews one or more layers of stitching material by forming one or more stitches on the stitching material with one or more stitching threads. The sewing machine can sew cotton, hemp, silk, wool, artificial fiber and other fabrics, leather, plastic, paper and other products, and the sewn stitch is neat, beautiful, flat, firm, fast in sewing speed and simple and convenient to use.

However, when the existing sewing machine starts the sewing, the presser foot needs to be lifted and then put in the sewing material, then the presser foot is lowered to an initial state to perform normal sewing, an automatic cutter cuts off the thread braid after the sewing is completed, then the spindle motor is stopped, and the next discharging sewing is waited. The sewing machine in the prior art is stopped after each sewing is finished, the needle stopping position is generally at the upper dead point position, the teeth are correspondingly lifted to the highest position, and the discharging space at the moment is equal to the height of the presser foot minus the height of the teeth, so that the discharging space is greatly reduced, when thick materials are required to be discharged, workers need to forcefully plug in, and when thin materials are required to be discharged, the materials can be easily scraped.

Disclosure of Invention

The utility model mainly aims to provide a sewing machine so as to solve the problem of small discharging space of the sewing machine in the prior art.

In order to achieve the above object, the present utility model provides a sewing machine including a needle plate assembly and a presser foot assembly, the presser foot assembly being movably disposed above the needle plate assembly, the presser foot assembly having a first initial state of being pressed against the needle plate assembly and a separated state of being separated from the needle plate assembly; the feeding tooth component is movably arranged on the needle plate component to move to a second initial state or a sinking state; when the feeding tooth part is in the second initial state, the tooth part of the feeding tooth part protrudes out of the needle plate assembly at a first preset height; when the feeding tooth part is in a sinking state, at least part of the tooth part of the feeding tooth part protrudes out of the needle plate assembly or is positioned below the needle plate assembly at a second preset height smaller than the first preset height; the feeding tooth transmission mechanism is connected with the feeding tooth component; when the presser foot assembly is in a first initial state, the feeding tooth transmission mechanism drives the feeding tooth component to move to a second initial state; when the presser foot assembly is in a separation state, the feeding tooth transmission mechanism drives the feeding tooth component to move to a sinking state; the feeding tooth transmission mechanism comprises a crank sliding block mechanism, and a transmission output part of the crank sliding block mechanism is connected with the feeding tooth component to drive the feeding tooth component to move.

Further, the sewing machine also comprises a driving device, the driving device is in driving connection with the transmission input part of the slider-crank mechanism so as to drive the slider-crank mechanism to move through the driving device, and the slider-crank mechanism comprises: the first sliding assembly comprises a first sliding block and a first installation block, a first sliding groove extending along a first preset direction is formed in the first installation block, and the first sliding block is slidably arranged in the first sliding groove; one end of the first rotating arm is hinged with the first sliding block, and the other end of the first rotating arm forms a transmission output part of the crank sliding block mechanism.

Further, the crank block mechanism further includes: the second sliding component is arranged at the bottom of the first mounting block; the second sliding assembly comprises a second installation block and a second sliding block, the second installation block is connected with the first installation block, a second sliding groove extending along a second preset direction is formed in the second installation block, and the first preset direction and the second preset direction are arranged at a first preset angle; the second sliding block is slidably arranged in the second sliding groove, and forms a transmission input part of the crank sliding block mechanism.

Further, the crank sliding block mechanism further comprises a connecting rod, and two ends of the connecting rod are respectively connected with the first mounting block and the second mounting block.

Further, the sewing machine further includes: the transmission input part of the presser foot transmission mechanism is connected with the driving device, and the transmission output part of the presser foot transmission mechanism is connected with the presser foot assembly; the second sliding block is arranged on the presser foot transmission mechanism so as to drive the second sliding block and the presser foot assembly to move through the presser foot transmission mechanism under the driving action of the driving device.

Further, the sewing machine also comprises a shell, the presser foot transmission mechanism comprises a transmission lever and a transmission part, one end of the transmission lever forms a transmission input part of the presser foot transmission mechanism, and the other end of the transmission lever is movably arranged on the shell; the transmission part is connected with the transmission lever, one end of the transmission part, which is far away from the transmission lever, forms a transmission output part of the presser foot transmission mechanism, and the second sliding block is fixed on the transmission lever.

Further, the second sliding block is arranged on the side part of the transmission lever, the second sliding block protrudes out of the side part of the transmission lever, the second installation block is arranged on the side part of the transmission lever, and the first sliding assembly is arranged above the transmission lever.

Further, the presser foot transmission mechanism further comprises an elastic reset piece, the connecting end of the elastic reset piece is connected with the shell, and the reset end of the elastic reset piece is connected with the transmission lever so as to drive the transmission lever to return through the elastic reset piece.

Further, the feeding tooth transmission mechanism further comprises an eccentric shaft, one end of the eccentric shaft is connected with the transmission output part of the crank block mechanism, and the other end of the eccentric shaft is connected with the feeding tooth component, so that the transmission output part of the crank block mechanism is connected with the feeding tooth component through the eccentric shaft.

Further, the feeding tooth part is arranged on the needle plate assembly in a swinging manner, and when the feeding tooth part is in a second initial state, the tooth part of the feeding tooth part is obliquely arranged at a second preset angle with the horizontal direction; when the feeding tooth part is in a sinking state, the tooth part of the feeding tooth part is obliquely arranged at a third preset angle with the horizontal direction.

The sewing machine provided by the utility model can enable the feeding tooth part to move to a sinking state by the feeding tooth transmission mechanism when the presser foot assembly is in a separation state by simply arranging the presser foot assembly, the feeding tooth part and the feeding tooth transmission mechanism. Thereby increasing the distance between the presser foot assembly and the feeding tooth component, further increasing the discharging space and avoiding the occurrence of the condition of scraping the cloth when the cloth is discharged. The sewing machine is simple in structure and convenient to operate, and solves the problem that the discharging space of the sewing machine in the prior art is small.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a schematic perspective view of an embodiment of a sewing machine according to the present utility model;

FIG. 2 shows a schematic view of the sewing machine of FIG. 1 with the housing removed;

FIG. 3 is a schematic view showing a structure of the sewing machine of FIG. 1 with a casing and a sleeve removed;

FIG. 4 shows a partial enlarged view of the sewing machine A of FIG. 1; and

fig. 5 shows a schematic structural view of an eccentric shaft of a sewing machine according to the present utility model.

Wherein the above figures include the following reference numerals:

1. a needle plate assembly; 2. a presser foot assembly; 3. a feed dog member; 4. a driving device; 401. an electromagnet; 402. a push rod; 403. a mounting base; 5. a presser foot transmission mechanism; 6. a feeding tooth transmission mechanism; 7. a crank slider mechanism; 8. a second slide assembly; 801. a second mounting block; 802. a second slider; 803. a second chute; 9. a first slide assembly; 901. a first slider; 902. a first mounting block; 903. a first chute; 10. a first rotating arm; 11. an eccentric shaft; 1101. a stepped shaft; 1102. a connecting shaft; 12. a housing; 13. a transmission lever; 14. a transmission member; 15. an elastic reset piece; 16. a connecting rod; 17. a dental frame component; 18. a shaft sleeve; 20. a presser foot arm; 21. a pull rod; 22. a second rotating arm; 23. a crank; 24. and (3) rotating the shaft.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 5, the present utility model provides a sewing machine, comprising: a needle plate assembly 1 and a presser foot assembly 2, the presser foot assembly 2 being movably arranged above the needle plate assembly 1, the presser foot assembly 2 having a first initial state of being pressed against the needle plate assembly 1 and a separated state of being separated from the needle plate assembly 1; a feed tooth part 3, the feed tooth part 3 is movably arranged on the needle plate assembly 1 to move to a second initial state or a sinking state; when the feeding tooth part 3 is in the second initial state, the tooth part of the feeding tooth part 3 protrudes out of the needle plate assembly 1 by a first preset height; when the feeding tooth part 3 is in a sinking state, at least part of the tooth part of the feeding tooth part 3 protrudes from the needle plate assembly 1 or is positioned below the needle plate assembly 1 at a second preset height smaller than the first preset height; the feeding tooth transmission mechanism 6 is connected with the feeding tooth component 3; when the presser foot assembly 2 is in a first initial state, the feeding tooth transmission mechanism 6 drives the feeding tooth part 3 to move to a second initial state; when the presser foot assembly 2 is in a separated state, the feeding tooth transmission mechanism 6 drives the feeding tooth component 3 to move to a sinking state; the feeding tooth transmission mechanism comprises a crank sliding block mechanism 7, and a transmission output part of the crank sliding block mechanism 7 is connected with the feeding tooth component 3 to drive the feeding tooth component 3 to move.

The utility model provides a sewing machine which comprises a needle plate assembly 1, a presser foot assembly 2, a feeding tooth component 3 and a feeding tooth transmission mechanism 6, wherein the presser foot assembly 2 is movably arranged above the needle plate assembly 1, and the presser foot assembly 2 is provided with a first initial state pressed on the needle plate assembly 1 and a separation state separated from the needle plate assembly 1; the feeding tooth part 3 is movably arranged on the needle plate assembly 1 to move to a second initial state or a sinking state; when the feeding tooth part 3 is in the second initial state, the tooth part of the feeding tooth part 3 protrudes out of the needle plate assembly 1 by a first preset height; when the feeding tooth part 3 is in a sinking state, at least part of the tooth part of the feeding tooth part 3 protrudes from the needle plate assembly 1 or is positioned below the needle plate assembly 1 at a second preset height smaller than the first preset height; the feeding tooth transmission mechanism 6 is connected with the feeding tooth component 3; when the presser foot assembly 2 is in a first initial state, the feeding tooth transmission mechanism 6 drives the feeding tooth part 3 to move to a second initial state; when the presser foot assembly 2 is in a separated state, the feeding tooth transmission mechanism 6 drives the feeding tooth component 3 to move to a sinking state; the feeding tooth transmission mechanism comprises a crank sliding block mechanism 7, and a transmission output part of the crank sliding block mechanism 7 is connected with the feeding tooth component 3 to drive the feeding tooth component 3 to move.

Therefore, the sewing machine can enable the feeding tooth transmission mechanism 6 to drive the feeding tooth component 3 to move to a sinking state when the presser foot component 2 is in a separation state by simply arranging the presser foot component 2, the feeding tooth component 3 and the feeding tooth transmission mechanism 6. Thereby increasing the distance between the presser foot assembly 2 and the feeding tooth part 3, further increasing the discharging space and avoiding the occurrence of scraping the cloth during discharging the cloth. The sewing machine is simple in structure and convenient to operate, and solves the problem that the discharging space of the sewing machine in the prior art is small.

In this embodiment, as shown in fig. 2 and 3, the sewing machine further includes a driving device 4, where the driving device 4 is in driving connection with the transmission input part of the slider-crank mechanism 7, so as to drive the slider-crank mechanism 7 to move through the driving device 4. The crank block mechanism 7 includes: the first sliding assembly 9 and the first rotating arm 10, the first sliding assembly 9 comprises a first sliding block 901 and a first mounting block 902, a first sliding groove 903 extending along a first preset direction is formed in the first mounting block 902, and the first sliding block 901 is slidably arranged in the first sliding groove 903; one end of the first rotating arm 10 is hinged with the first sliding block 901, and the other end of the first rotating arm 10 forms a transmission output part of the crank block mechanism 7.

In the specific implementation process, as shown in fig. 2 and 3, the crank block mechanism 7 further includes: a second sliding assembly 8, the second sliding assembly 8 being disposed at the bottom of the first mounting block 902; the second sliding component 8 comprises a second installation block 801 and a second sliding block 802, the second installation block 801 is connected with the first installation block 902, a second sliding groove 803 extending along a second preset direction is formed in the second installation block 801, and the first preset direction and the second preset direction are arranged at a first preset angle; a second slide block 802 is slidably arranged in the second slide groove 803, the second slide block 802 forming a transmission input of the crank block mechanism 7.

In a specific implementation process, as shown in fig. 2 and 3, the crank slider mechanism 7 further includes a connecting rod 16, and two ends of the connecting rod 16 are respectively connected with the first mounting block 902 and the second mounting block 801.

In this embodiment, as shown in fig. 1, the sewing machine further includes: the presser foot transmission mechanism 5, the transmission input part of the presser foot transmission mechanism 5 is connected with the driving device 4, and the transmission output part of the presser foot transmission mechanism 5 is connected with the presser foot assembly 2; the second sliding block 802 is arranged on the presser foot transmission mechanism 5, so that the second sliding block 802 and the presser foot assembly 2 are driven to move by the presser foot transmission mechanism 5 under the driving action of the driving device 4.

In the implementation process, as shown in fig. 1, the sewing machine further comprises a machine shell 12, the presser foot transmission mechanism 5 comprises a transmission lever 13 and a transmission part 14, one end of the transmission lever 13 forms a transmission input part of the presser foot transmission mechanism 5, and the other end of the transmission lever 13 is movably arranged on the machine shell 12; the transmission part 14 is connected with the transmission lever 13, one end of the transmission part 14 far away from the transmission lever 13 forms a transmission output part of the presser foot transmission mechanism 5, and the second sliding block 802 is fixed on the transmission lever 13.

In the implementation process, as shown in fig. 1 to 3, the second sliding block 802 is disposed at a side portion of the transmission lever 13, the second sliding block 802 protrudes from the side portion of the transmission lever 13, the second mounting block 801 is disposed at the side portion of the transmission lever 13, and the first sliding component 9 is disposed above the transmission lever 13.

In the specific implementation process, as shown in fig. 1 and 2, the connection part of the transmission part 14 and the transmission lever 13 and the connection part of the second sliding block 802 and the transmission lever 13 are arranged at intervals along the horizontal extending direction of the transmission lever 13.

In the actual working process, when the driving device 4 drives the transmission lever 13 to move, the transmission lever 13 drives the transmission part 14 to move, and then the transmission part 14 drives the presser foot assembly 2 to move; at the same time, the transmission lever 13 drives the transmission part 14 to move and simultaneously drives the second sliding block 802 to move, so that the second sliding block 802 drives the first rotating arm 10 to move through the first sliding assembly 9, and further drives the feeding tooth part 3 to move through the first rotating arm 10. So that when the transmission part 14 drives the presser foot assembly 2 to move to a separated state, the first rotating arm 10 drives the feeding tooth part 3 to move to a sinking state; when the transmission part 14 drives the presser foot assembly to move to the first initial state, the first rotating arm 10 drives the feeding tooth part 3 to move to the second initial state.

In this embodiment, as shown in fig. 1 to 3, the presser foot transmission mechanism 5 further includes an elastic reset member 15, a connection end of the elastic reset member 15 is connected with the casing 12, and a reset end of the elastic reset member 15 is connected with the transmission lever 13, so that the transmission lever 13 is driven to return by the elastic reset member 15.

Preferably, the elastic restoring member 15 is a restoring spring.

In a specific implementation process, as shown in fig. 2 and 3, the feeding tooth transmission mechanism 6 further includes an eccentric shaft 11, one end of the eccentric shaft 11 is connected with the second output portion, and the other end of the eccentric shaft 11 is connected with the feeding tooth component 3, so that the second output portion is connected with the feeding tooth component 3 through the eccentric shaft 11.

In the specific implementation process, as shown in fig. 5, the eccentric shaft 11 includes a stepped shaft 1101 and a connecting shaft 1102, the connecting shaft 1102 is eccentrically disposed on an end surface far from one end of the second output part, the stepped shaft 1101 and the connecting shaft 1102 are fixedly connected, and the connecting shaft 1102 is connected with the feeding tooth part.

In the specific implementation process, the feeding tooth part 3 is arranged on the needle plate assembly 1 in a swinging way, and when the feeding tooth part 3 is in a second initial state, the tooth part of the feeding tooth part 3 is obliquely arranged at a second preset angle with the horizontal direction; when the feeding tooth part 3 is in a sinking state, the tooth part of the feeding tooth part 3 is obliquely arranged at a third preset angle with the horizontal direction.

The second preset angle is that, because the feeding tooth component 3 swings relative to the needle plate assembly 1, when the feeding tooth component 3 is in the second initial state, the tooth tips of the tooth parts of the feeding tooth component 3 are not in the horizontal state, and the height of the tooth parts of the feeding tooth component 3 protruding from the needle plate assembly 1 gradually decreases along the feeding direction, so that the tooth parts of the feeding tooth component 3 form the second preset angle with the horizontal direction.

The third preset angle is that as the feeding tooth part 3 swings relative to the needle plate assembly 1, when the feeding tooth part 3 is in a sinking state, the tooth parts of the feeding tooth part 3 are not all positioned below the needle plate assembly 1, and the tooth parts of the feeding tooth part 3 gradually protrude out of the needle plate assembly 1 along the feeding direction, so that the tooth parts of the feeding tooth part 3 form the third preset angle with the horizontal direction; when the feeding tooth part 3 is in a sinking state, the tooth part of the feeding tooth part 3 protrudes out of the needle plate assembly 1 to a smaller height than when the feeding tooth part 3 is in a second initial state, the tooth part of the feeding tooth part 3 protrudes out of the needle plate assembly 1.

In the actual working process, a plurality of mounting holes extending along the horizontal direction are formed in the needle plate assembly 1, the tooth parts of the feeding tooth parts 3 are arranged in the mounting holes, and the tooth parts of the feeding tooth parts 3 are arranged at intervals along the extending direction of the mounting holes; the feeding tooth part 3 swings relative to the needle plate assembly 1, and when the feeding tooth part 3 moves to a second initial state, the tooth parts of the feeding tooth part 3 are obliquely arranged at a second preset angle with the horizontal direction and extend along the horizontal direction; when the feeding tooth part 3 moves to a sinking state, the tooth parts of the feeding tooth part 3 are obliquely arranged at a third preset angle with the horizontal direction.

In the embodiment, as shown in fig. 2 and 3, the sewing machine further includes a frame member 17, and the feeding tooth member 3 is disposed on one end of the frame member 17 near the needle plate assembly 1, and the other end of the frame member 17 is connected to the connecting shaft 1102 such that the eccentric shaft 11 is connected to the feeding tooth member 3 through the frame member 17.

In the actual working process, the connecting shaft 1102 is driven to eccentrically rotate by the rotation of the stepped shaft 1101, so that one end of the dental frame component 17, which is far away from the needle plate component 1, is driven to move upwards or return, and when one end of the dental frame component 17, which is far away from the needle plate component 1, moves upwards, one end of the dental frame component 17, which is connected with the feeding dental component 3, swings downwards, so that the feeding dental component is driven to move to a sinking state; when the end of the tooth frame component 17 far away from the needle plate component 1 returns, the end, connected with the feeding tooth component 3, of the tooth frame component 17 swings upwards, and then the feeding tooth component is driven to move to a second initial state.

In a specific implementation process, as shown in fig. 1, the driving device 4 is disposed above the transmission lever 13, the driving device 4 includes an electromagnet 401, a push rod 402, and a mounting seat 403, the electromagnet 401 is connected with the mounting seat 403, and is disposed on the casing 12 through the mounting seat 403, and the push rod 402 is movably disposed in the electromagnet 401 and is disposed towards the transmission lever 13, so that the push rod 402 is driven to stretch by switching on and switching off the electromagnet 401.

In the actual working process, when the electromagnet 401 is not electrified, the ejector rod 402 is not contacted with the transmission lever 13, and when the electromagnet 401 is electrified, a magnetic field is generated in the electromagnet 401, so that the ejector rod 402 is driven to extend out to be contacted with the transmission lever 13, and the transmission lever 13 is driven to rotate anticlockwise relative to the machine shell 12; when the electromagnet 401 is powered off, no magnetic field exists in the electromagnet 401, the ejector rod 402 is reset by a spring in the electromagnet 401 by means of reset, and the transmission lever 13 is reset through the elastic reset piece 15.

In an implementation, as shown in fig. 2, the sewing machine further includes a sleeve 18, and the sleeve 18 is sleeved on the eccentric shaft 11 to fix the position of the eccentric shaft 11.

In the specific implementation process, as shown in fig. 2 and 3, the transmission component 14 includes a pull rod 21, a second rotating arm 22, a crank 23 and a rotating shaft 24, two ends of the pull rod 21 are respectively connected with the transmission lever 13 and the second rotating arm 22, the other end of the second rotating arm 22 away from the transmission lever 13 is in running fit with the crank 23, the crank 23 is arranged at the side part of the second rotating arm 22 away from the presser foot assembly 2, one end of the rotating shaft passes through the second rotating arm 22 and is fixedly connected with the crank 23, and the other end of the rotating shaft forms a first output part.

In the implementation, as shown in fig. 2 and 3, the sewing machine further includes a presser foot arm 20, one end of the presser foot arm 20 is connected to the first output portion, and the other end of the presser foot arm 20 is connected to the presser foot assembly 2, so that the first output portion is connected to the presser foot assembly 2 through the presser foot arm.

In the actual working process, when the electromagnet 401 is not electrified, the ejector rod 402 is not in contact with the transmission lever 13, and at the moment, the presser foot assembly 2 is in a first initial state (i.e. the presser foot assembly 2 is pressed on the needle plate assembly 1), and the feeding tooth component 3 is in a second initial state (i.e. the feeding tooth component protrudes above the needle plate assembly 1 by a first preset height and is in contact with the presser foot assembly 2).

When cloth is required to be placed, the electromagnet 401 is electrified, a magnetic field is generated in the electromagnet 401, the ejector rod 402 stretches out towards the transmission lever 13, when the ejector rod 402 is in contact with the transmission lever 13, the ejector rod 402 drives the transmission lever to rotate anticlockwise relative to the machine shell 12, and then the transmission lever 13 drives the transmission part 14 and the feeding tooth transmission mechanism 6 to synchronously move, so that the transmission part 14 drives the presser foot assembly 2 to move from a first initial state to a separation state (namely, drives the presser foot assembly 2 to lift), and meanwhile, the feeding tooth transmission mechanism 6 drives the feeding tooth assembly 3 to move from a second initial state to a sinking state.

The specific movement process of the transmission part 14 is as follows:

when the transmission lever 13 rotates counterclockwise, the pull rod 21 drives the second rotating arm 22 to rotate counterclockwise relative to the rotating shaft 24, and then the second rotating arm 22 drives the crank 23 and the rotating shaft 24 to rotate counterclockwise, so that the presser foot assembly 2 moves from the first initial state to the separated state through the presser foot arm 20.

The specific movement process of the feeding tooth transmission mechanism 6 is as follows:

when the transmission lever 13 rotates anticlockwise, the second sliding block 802 fixedly connected with the transmission lever 13 slides in the second sliding groove 803 and drives the second installation block 801 to move downwards so as to drive the first installation block 902 to move downwards, so that the first rotating arm 10 rotates anticlockwise and the first sliding block 901 slides in the first sliding groove, the eccentric shaft 11 is driven to rotate anticlockwise and eccentrically through the anticlockwise rotation of the first rotating arm 10, one end, far away from the needle plate assembly 1, of the dental frame component 17 is driven to move upwards, and the dental frame component 17 drives the feeding dental component 3 to move from the second initial state to the sinking state.

After the cloth is placed, the electromagnet 401 is powered off, at the moment, the electromagnet 401 loses a magnetic field, the ejector rod 402 returns, the transmission lever 13 resets under the help of the elastic resetting piece 15, and the transmission lever 13 drives the transmission part 14 and the feeding tooth transmission mechanism 6 to synchronously move, so that the transmission part 14 drives the presser foot assembly 2 to move from a separation state to a first initial state, and the feeding tooth transmission mechanism 6 drives the feeding tooth part 3 to move from a sinking state to a second initial state.

The specific movement process of the transmission part 14 and the feeding tooth transmission mechanism 6 at this time is opposite to the specific movement process of the transmission part 14 and the feeding tooth transmission mechanism 6 when placing cloth, and will not be repeated here.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A sewing machine, comprising:

a needle plate assembly (1) and a presser foot assembly (2), wherein the presser foot assembly (2) is movably arranged above the needle plate assembly (1), and the presser foot assembly (2) has a first initial state pressed on the needle plate assembly (1) and a separation state separated from the needle plate assembly (1);

a feed dog member (3), the feed dog member (3) being movably provided on the needle plate assembly (1) to move to a second initial state or a sinking state; when the feeding tooth part (3) is in the second initial state, the tooth part of the feeding tooth part (3) protrudes out of the needle plate assembly (1) at a first preset height; when the feeding tooth component (3) is in the sinking state, at least part of the tooth part of the feeding tooth component (3) protrudes out of the needle plate assembly (1) or is positioned below the needle plate assembly (1) at a second preset height smaller than the first preset height;

a feeding tooth transmission mechanism (6) connected with the feeding tooth component (3); when the presser foot assembly (2) is in the first initial state, the feeding tooth transmission mechanism (6) drives the feeding tooth component (3) to move to the second initial state; when the presser foot assembly (2) is in the separation state, the feeding tooth transmission mechanism (6) drives the feeding tooth component (3) to move to the sinking state; the feeding tooth transmission mechanism comprises a crank block mechanism (7), and a transmission output part of the crank block mechanism (7) is connected with the feeding tooth component (3) so as to drive the feeding tooth component (3) to move.

2. The sewing machine of claim 1, further comprising a drive device (4), the drive device (4) being drivingly connected to a transmission input of the slider-crank mechanism (7) to drive the slider-crank mechanism (7) in motion via the drive device (4), the slider-crank mechanism (7) comprising:

the sliding device comprises a first sliding assembly (9) and a first rotating arm (10), wherein the first sliding assembly (9) comprises a first sliding block (901) and a first mounting block (902), a first sliding groove (903) extending along a first preset direction is formed in the first mounting block (902), and the first sliding block (901) is slidably arranged in the first sliding groove (903); one end of the first rotating arm (10) is hinged with the first sliding block (901), and the other end of the first rotating arm (10) forms a transmission output part of the crank sliding block mechanism (7).

3. The sewing machine of claim 2, wherein the slider-crank mechanism (7) further comprises:

-a second sliding assembly (8), the second sliding assembly (8) being arranged at the bottom of the first mounting block (902); the second sliding assembly (8) comprises a second installation block (801) and a second sliding block (802), the second installation block (801) is connected with the first installation block (902), a second sliding groove (803) extending along a second preset direction is formed in the second installation block (801), and the first preset direction and the second preset direction are arranged at a first preset angle; the second sliding block (802) is slidably arranged in the second sliding groove (803), and the second sliding block (802) forms a transmission input part of the crank sliding block mechanism (7).

4. A sewing machine according to claim 3, characterized in that the slider-crank mechanism (7) further comprises a connecting rod (16), both ends of the connecting rod (16) being connected to the first mounting block (902) and the second mounting block (801), respectively.

5. A sewing machine as defined in claim 3, further comprising:

the presser foot transmission mechanism (5), the transmission input part of the presser foot transmission mechanism (5) is connected with the driving device (4), and the transmission output part of the presser foot transmission mechanism (5) is connected with the presser foot assembly (2); the second sliding block (802) is arranged on the presser foot transmission mechanism (5) so as to drive the second sliding block (802) and the presser foot assembly (2) to move under the driving action of the driving device (4) through the presser foot transmission mechanism (5).

6. The sewing machine of claim 5, further comprising a housing (12), the presser foot transmission mechanism (5) comprising a transmission lever (13) and a transmission member (14), one end of the transmission lever (13) forming a transmission input of the presser foot transmission mechanism (5), the other end of the transmission lever (13) being movably disposed on the housing (12); the transmission part (14) is connected with the transmission lever (13), one end of the transmission part (14) away from the transmission lever (13) forms a transmission output part of the presser foot transmission mechanism (5), and the second sliding block (802) is fixed on the transmission lever (13).

7. The sewing machine of claim 6, wherein the second slider (802) is disposed at a side of the transmission lever (13), the second slider (802) is disposed protruding from the side of the transmission lever (13), the second mounting block (801) is disposed at the side of the transmission lever (13), and the first slider assembly (9) is disposed above the transmission lever (13).

8. The sewing machine of claim 6, wherein the presser foot transmission mechanism (5) further comprises an elastic reset member (15), a connection end of the elastic reset member (15) is connected with the machine shell (12), and a reset end of the elastic reset member (15) is connected with the transmission lever (13) so as to drive the transmission lever (13) to return through the elastic reset member (15).

9. The sewing machine of any of claims 1 to 8, wherein the feed dog drive mechanism (6) further comprises an eccentric shaft (11), one end of the eccentric shaft (11) is connected to the drive output of the slider-crank mechanism (7), and the other end of the eccentric shaft (11) is connected to the feed dog member (3) such that the drive output of the slider-crank mechanism (7) is connected to the feed dog member (3) via the eccentric shaft (11).

10. The sewing machine according to any one of claims 1 to 8, wherein the feed dog member (3) is swingably provided on the needle plate assembly (1), and when the feed dog member (3) is in the second initial state, the teeth of the feed dog member (3) are inclined at a second predetermined angle to the horizontal; when the feeding tooth part (3) is in the sinking state, the tooth part of the feeding tooth part (3) is obliquely arranged at a third preset angle with the horizontal direction.