CN218812504U - Sewing machine - Google Patents

Abstract

The application provides a sewing machine, relate to the technical field of sewing, is used for solving the technical problem that the thread trimming action is advanced or lagged when the sewing machine works, the sewing machine includes the body, and control mechanism, actuating mechanism, presser foot lifting mechanism and thread trimming mechanism set in body; the control mechanism is used for controlling a driving shaft of the driving mechanism to rotate by a preset angle at a preset speed; the presser foot lifting mechanism comprises a first rotating connecting piece, the thread trimming mechanism comprises a second rotating connecting piece, one end of the first rotating connecting piece and one end of the second rotating connecting piece are both connected onto the driving shaft, the other end of the first rotating connecting piece is provided with a presser foot, the presser foot is positioned above the working table plate of the shell, and the first rotating connecting piece can drive the presser foot to be close to or far away from the working table plate; the other end of the second rotating connecting piece is provided with a thread trimmer, and the second rotating connecting piece can drive the thread trimmer to be meshed with a fixed knife arranged on the working table plate. The precise matching and the quick response of the presser foot lifting and the thread trimming are realized.

Description

Sewing machine

Technical Field

The application relates to the technical field of sewing, in particular to a sewing machine.

Background

The sewing machine is a machine which uses sewing threads to form stitches on the sewing materials and enables one or more layers of the sewing materials to be interwoven or sewed together; the sewing machine comprises a presser foot lifting mechanism and a thread trimming mechanism, wherein the presser foot lifting mechanism descends, stitches are formed on sewing materials, the presser foot lifting mechanism ascends, and the sewing materials move; and (4) when the sewing is finished and the presser foot lifting mechanism is not lifted (the cloth is pressed), trimming is carried out through the trimming mechanism.

In the related art, the rising and falling of the presser foot lifting mechanism are driven by the stretching of one electromagnet core, and the thread cutting mechanism is driven by the stretching of the other electromagnet core to cut threads.

However, the response speeds and response times of the two electromagnets have errors, and the situation of cutting the thread ahead of time or delaying the cutting of the thread easily occurs.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, embodiments of the present application provide a sewing machine that solves the problem of an early or late thread cutting operation and improves sewing accuracy and sewing efficiency.

In order to achieve the above object, the embodiments of the present application provide the following technical solutions:

the embodiment of the application provides a sewing machine, which comprises a shell, a control mechanism, a driving mechanism, a presser foot lifting mechanism and a thread trimming mechanism, wherein the control mechanism, the driving mechanism, the presser foot lifting mechanism and the thread trimming mechanism are arranged on the shell; the control mechanism is electrically connected with the driving mechanism and is used for controlling a driving shaft of the driving mechanism to rotate for a preset angle at a preset speed; the presser foot lifting mechanism comprises a first rotating connecting piece, the thread cutting mechanism comprises a second rotating connecting piece, one end of the first rotating connecting piece and one end of the second rotating connecting piece are both connected to the driving shaft, and one end of the first rotating connecting piece and one end of the second rotating connecting piece are arranged on the driving shaft at intervals along the axial direction of the driving shaft; the other end of the first rotating connecting piece is provided with a presser foot, the shell comprises a working table plate, the presser foot is positioned above the working table plate, and the first rotating connecting piece drives the presser foot to be close to or far away from the working table plate; the other end of the second rotating connecting piece is provided with a thread trimmer, the working table plate is provided with a fixed cutter, and the second rotating connecting piece drives the thread trimmer to be meshed with the fixed cutter.

In one possible implementation, the first rotational connection includes a first crank, a first drive plate, a second crank, a presser foot shaft, and a presser foot shaft sleeve; the first crank is connected to the driving shaft, the first driving plate comprises a first abutting end, the first abutting end is movably connected to the shell, and the driving shaft drives the first crank to be close to the first abutting end and drives the first abutting end to rotate; the presser foot shaft sleeve is fixedly connected to the shell, the presser foot shaft is arranged in the presser foot shaft sleeve, a first connecting end and a second connecting end of the presser foot shaft respectively penetrate out of the presser foot shaft sleeve, and the first connecting end is connected with the presser foot; the first driving plate further comprises a first rotating end, the first rotating end is provided with a first connecting hole matched with the second connecting end, and the first rotating end rotates around the presser foot shaft; the second crank is connected the second link, just it is protruding to be provided with the second crank butt on the second crank, first rotation end be provided with the protruding matched with first arch of second crank butt.

In one possible implementation, the second rotary connection includes a third crank, a second drive plate, and a shear spool; the third crank is connected to the driving shaft, the second driving plate is rotatably connected to the shell and comprises a second abutting end and a second rotating end, and the driving shaft drives the third crank to be close to the second abutting end and drives the second abutting end to rotate; one end of the thread cutting shaft is rotatably connected with the second rotating end, and the other end of the thread cutting shaft is connected with the thread cutter.

In a possible implementation manner, the second rotating end is provided with a connecting through groove, the second rotating connecting piece further comprises a rotating matching piece, and one end of the wire cutting shaft is rotatably connected with the second rotating end through the rotating matching piece; the rotation fitting piece comprises a third connecting end and a fourth connecting end, the third connecting end is connected in the connecting through groove, the fourth connecting end is provided with a fourth connecting hole matched with one end of the thread cutting shaft, the second rotating end drives the third connecting end to rotate, and meanwhile, the fourth connecting end drives the thread cutting shaft to rotate.

In a possible implementation manner, the thread trimming mechanism further includes a second return spring, one end of the second return spring is connected to the housing, and the other end of the second return spring is connected to the third connection end.

In a possible implementation manner, the sewing machine further comprises a limiting mechanism, the limiting mechanism comprises an installation part and a damping limiting part, the installation part is arranged on the shell, the damping limiting part is arranged on the installation part, and the damping limiting part is opposite to the first abutting end.

In a possible implementation manner, the first abutting end is provided with an arc-shaped groove, and the first crank is close to the first abutting end and abuts against a groove wall of the arc-shaped groove.

In a possible implementation, the first rotary joint further comprises a cam follower, one end of which is connected to the first crank and the other end of which is close to the first abutment end and abuts against a wall of the arc-shaped slot.

In a possible implementation manner, the second driving plate further includes an intermediate rotation connection end, the intermediate rotation connection end is located between the second abutting end and the second rotation end, a third connection hole is formed in the intermediate rotation connection end, a second connection bolt connects the second driving plate to the housing through the third connection hole, and the second driving plate can rotate around the second connection bolt; the second abutting end is provided with a bending plate, and the third crank is close to the second abutting end and abuts against the bending plate.

In a possible implementation manner, the second rotating connection piece further comprises a rod end ball, a connection rod end of the rod end ball is connected to the third crank, and an outer spherical surface of the rod end ball is close to the first abutting end and abuts against the bending plate.

The embodiment of the application provides a sewing machine, wherein a control mechanism of the sewing machine is electrically connected with a driving mechanism and used for controlling a driving shaft of the driving mechanism to rotate at a preset speed by a preset angle; the presser foot lifting mechanism comprises a first rotating connecting piece, the thread trimming mechanism comprises a second rotating connecting piece, one end of the first rotating connecting piece and one end of the second rotating connecting piece are both connected to the driving shaft, and one end of the first rotating connecting piece and one end of the second rotating connecting piece are arranged on the driving shaft at intervals along the axial direction of the driving shaft; the other end of the first rotating connecting piece is provided with a presser foot, the presser foot is positioned above a working table plate arranged on the shell, and the first rotating connecting piece can drive the presser foot to be close to or far away from the working table plate when the driving shaft rotates; the other end of the second rotating connecting piece is provided with a thread trimmer, and the second rotating connecting piece can drive the thread trimmer to be meshed with a fixed cutter arranged on the working table plate when the driving shaft rotates. The sewing machine is simple in structure and good in practicability, the driving mechanism can drive the presser foot lifting mechanism and the thread cutting mechanism to work simultaneously, the rotating angle and the rotating speed of the driving mechanism are set in advance through the control mechanism, the response speed of the thread cutting knife is controlled, the arbitrary meshing amount of the thread cutting knife and the fixed knife in the practical range is controlled, the presser foot is controlled to lift up and descend at any height in the practical range, accurate matching and quick response of the presser foot action and the thread cutting action are achieved, the problem that the thread cutting action is advanced or lagged is solved, and the sewing precision and the sewing efficiency are improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a sewing machine according to an embodiment of the present application;

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

FIG. 3 is a schematic structural view of a presser foot lifting mechanism of the sewing machine according to the embodiment of the present application;

FIG. 4 is a schematic structural diagram of a thread trimming mechanism of a sewing machine according to an embodiment of the present application;

FIG. 5 is an exploded view of a presser foot lifting mechanism of a sewing machine according to an embodiment of the present application;

FIG. 6 is an exploded view of a thread trimming mechanism of a sewing machine according to an embodiment of the present application;

FIG. 7 is a schematic view of a second crank of the sewing machine according to the embodiment of the present application;

FIG. 8 is a schematic structural diagram of a first driving plate of the sewing machine according to the embodiment of the application;

FIG. 9 is a schematic structural view of a first crank of the sewing machine according to the embodiment of the present application;

FIG. 10 is an enlarged view of portion B of FIG. 1;

FIG. 11 is a schematic structural view of a position-limiting mechanism of the sewing machine according to the embodiment of the present application;

FIG. 12 is a schematic structural view of a second driving plate of the sewing machine according to the embodiment of the present application;

FIG. 13 is a schematic view of a rotating fitting of the sewing machine according to the embodiment of the present application;

fig. 14 is a schematic structural view of a third crank of the sewing machine according to the embodiment of the present application.

Description of reference numerals:

100: a housing;

101: a work table;

200: a drive mechanism;

201: a drive shaft;

300: a presser foot lifting mechanism;

301: a first rotational connection; 302: a presser foot; 303: a first mating connector; 304: a cam follower; 305: a limiting member;

3011: a first crank; 3012: a first drive plate; 3013: a second crank; 3014: a presser foot shaft; 3015: a presser foot shaft sleeve; 3016: a presser foot connecting arm; 3031: a connecting plate; 3032: a movable connecting column; 3033: a first connecting bolt; 3034: a first return spring; 3051: a first limit end; 3052: a second limit end;

30111: a first crank attachment hole; 30121: a first rotating end; 30122: a first abutting end; 30123: an arc-shaped slot; 30125: a first protrusion; 30126: a second protrusion; 30127: a first connection hole; 30128: a second connection hole; 30131: the second crank abuts against the bulge; 30141: a second connection end;

400: a thread trimming mechanism;

401: a second rotating link; 402: a thread cutter; 403: a second mating connector; 404: a reset assembly; 405: a rod end ball head;

4011: a third crank; 4012: a second drive plate; 4013: a thread cutting shaft; 4014: a rotating fitting; 4031: a fourth connecting bolt; 4032: a gasket; 4041: a second return spring; 4042: a spring mount; 4051: a rod end connector; 4052: a ball head;

40111: a third crank attachment hole; 40112: fastening a connecting bolt; 40121: a second abutting end; 40122: a middle rotary connecting end; 40123: a second rotating end; 40124: connecting the through grooves; 40125: a third connection hole; 40131: a shear line shaft connecting end; 40141: fastening the connecting hole; 40142: a third connecting bolt;

500: a limiting mechanism;

501: a mounting member; 502: a shock absorbing limit piece; 503: and a second connecting bolt.

Detailed Description

As explained in the background art, the sewing machine in the related art has the problem of early thread trimming or lagging thread trimming, and the research of technical personnel finds that the problem is caused because the sewing machine usually adopts two electromagnets with different powers to respectively drive the thread trimming mechanism and the presser foot lifting mechanism in the sewing process, and the electromagnet can only lift and lower the presser foot within a fixed height range when being driven, or the speed of lifting and lowering the presser foot is controlled by adjusting the power supply current or the power supply voltage of the electromagnet, but the sewing machine cannot be accurately controlled in the actual use process, and the practicability is poor; and the response speed and the response time of the two electromagnets have errors, the presser foot action and the thread trimming action cannot be accurately matched, the problem of thread trimming in advance or lagging thread trimming action is easy to occur, secondary trimming needs to be carried out manually after the thread trimming in advance, and the lagging thread trimming action causes fabric flaws and even scrapping.

In view of the above technical problems, the embodiment of the present application provides a sewing machine, which drives a presser foot lifting mechanism and a thread cutting mechanism to work simultaneously through a motor, and sets a rotation angle and a rotation speed of the motor in advance through a control mechanism, thereby controlling a response speed of a thread cutter, controlling an arbitrary meshing amount of the thread cutter and a stationary knife in a practical range, and controlling the presser foot to lift up and descend at an arbitrary height in the practical range, so as to realize accurate matching and quick response of presser foot action and thread cutting action, solve the problem of lagging thread cutting or thread cutting action in advance, and improve sewing precision and sewing efficiency.

In order to make the aforementioned objects, features and advantages of the embodiments of the present application more comprehensible, embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a sewing machine, and referring to fig. 1-6, fig. 1 is a schematic structural diagram of the sewing machine, fig. 2 is an enlarged view of a part a (including a driving mechanism, a presser foot lifting mechanism and a thread cutting mechanism) in fig. 1, fig. 3 is a schematic structural diagram of a connection between the presser foot lifting mechanism and the driving mechanism, fig. 4 is a schematic structural diagram of a connection between the thread cutting mechanism and the driving mechanism, fig. 5 is an exploded view of the presser foot lifting mechanism, and fig. 6 is an exploded view of the thread cutting mechanism. The sewing machine comprises a shell 100, wherein the shell 100 is provided with a worktable 101, and fabric is placed on the worktable 101 for sewing; the sewing machine further comprises a control mechanism and a driving mechanism 200, wherein the control mechanism and the driving mechanism 200 are both arranged on the shell 100, the driving mechanism 200 comprises a driving shaft 201, the control mechanism is electrically connected with the driving mechanism 200, and the control mechanism is used for controlling the driving shaft 201 of the driving mechanism 200 to rotate; the control mechanism may be a programmable control system, the driving mechanism 200 may be a driving motor, and a user may preset a rotation speed and a rotation angle of the driving motor on the programmable control system according to an actual sewing situation, so as to control the driving shaft 201 to rotate at a preset speed by a preset angle.

The sewing machine further comprises a presser foot lifting mechanism 300 and a thread trimming mechanism 400, wherein the presser foot lifting mechanism 300 and the thread trimming mechanism 400 are both arranged on the shell 100; the driving mechanism 200 is connected to both the presser foot lifting mechanism 300 and the thread trimming mechanism 400, and the driving mechanism 200 can drive the presser foot lifting mechanism 300 to perform the presser foot lifting operation and drive the thread trimming mechanism 400 to perform the thread trimming operation. The presser foot lifting mechanism 300 comprises a first rotary connecting piece 301, the thread cutting mechanism 400 comprises a second rotary connecting piece 401, one end of the first rotary connecting piece 301 and one end of the second rotary connecting piece 401 are both connected to the driving shaft 201, and one end of the first rotary connecting piece 301 and one end of the second rotary connecting piece 401 are arranged on the driving shaft 201 at intervals along the axial direction of the driving shaft 201; the other end of the first rotary connecting piece 301 is provided with a presser foot 302, the presser foot 302 is positioned above the work table plate 101 (above in fig. 1), the other end of the second rotary connecting piece 401 is provided with a thread trimmer 402, and the work table plate 101 is provided with a fixed cutter matched with the thread trimmer 402.

When the driving shaft 201 rotates and drives one end of the first rotating connecting piece 301 and one end of the second rotating connecting piece 401 to rotate, one end of the first rotating connecting piece 301 drives the other end of the first rotating connecting piece 301 to be lifted, and the presser foot 302 is far away from the working table plate 101; or one end of the first rotating connecting piece 301 drives the other end of the first rotating connecting piece 301 to be put down, and the presser foot 302 is close to the working table plate 101; one end of the second rotary connecting piece 401 drives the other end of the second rotary connecting piece 401 to rotate towards the fixed knife, and the thread trimmer 402 is meshed with the fixed knife to complete thread trimming.

In the sewing machine of the embodiment of the application, the control mechanism is electrically connected with the driving mechanism 200 and is used for controlling the driving shaft 201 of the driving mechanism 200 to rotate for a preset angle at a preset speed; the presser foot lifting mechanism 300 comprises a first rotating connecting piece 301, the thread trimming mechanism 400 comprises a second rotating connecting piece 401, one end of the first rotating connecting piece 301 and one end of the second rotating connecting piece 401 are both connected to the driving shaft 201, and one end of the first rotating connecting piece 301 and one end of the second rotating connecting piece 401 are arranged on the driving shaft 201 at intervals along the axial direction of the driving shaft 201; the other end of the first rotating connecting piece 301 is provided with a presser foot 302, the presser foot 302 is positioned above the work table board 101 arranged on the shell 100, and the first rotating connecting piece 301 can drive the presser foot 302 to be close to or far away from the work table board 101 when the driving shaft 201 rotates; the other end of the second rotating connector 401 is provided with a thread trimmer 402, and when the driving shaft 201 rotates, the second rotating connector 401 can drive the thread trimmer 402 to be meshed with a fixed cutter arranged on the working table plate 101. The sewing machine is simple in structure and good in practicability, the driving mechanism 200 can drive the presser foot lifting mechanism 300 and the thread cutting mechanism 400 to work simultaneously, the rotating angle and the rotating speed of the driving mechanism 200 are set in advance through the control mechanism, the response speed of the thread cutting knife 402 is controlled, the random meshing amount of the thread cutting knife 402 and the fixed knife in the practical range is controlled, the presser foot 302 is controlled to lift up and descend at any height in the practical range, accurate matching and quick response of presser foot action and thread cutting action are achieved, the problem that the thread cutting action is advanced or lagged is solved, and sewing precision and sewing efficiency are improved.

It should be noted that, when a user sews the ultrathin and easily damaged fabric, the height of the presser foot and the engagement amount of the thread cutting knife can be controlled by a programmable control system (control mechanism), the descending height and speed of the presser foot 302 are reduced, the fabric is prevented from being damaged, and the thread cutting response time is accurately controlled; meanwhile, the user can also reduce the noise of the thread trimming action and the presser foot lifting action by adjusting the rotating speed of the driving mechanism 200 according to the actual requirement, and the use comfort of the equipment is improved.

Referring to fig. 2, fig. 3 and fig. 5, in the embodiment of the present application, the first rotating connection member 301 may include a first crank 3011, a first driving plate 3012, a second crank 3013, a presser foot shaft 3014 and a presser foot shaft sleeve 3015, where the first crank 3011 is sleeved on the driving shaft 201 and rotates along with the rotation of the driving shaft 201; the first driving plate 3012 includes a first rotating end 30121 and a first abutting end 30122, the first rotating end 30121 is rotatably connected to the presser foot shaft sleeve 3015, the first abutting end 30122 is movably connected to the housing 100, and when the driving shaft 201 drives the first crank 3011 to rotate, the first crank 3011 approaches the first abutting end 30122 and drives the first abutting end 30122 to rotate along a first direction (a Z-axis direction shown in fig. 2 and 3); the presser foot shaft sleeve 3015 is fixedly connected to the housing 100, the presser foot shaft 3014 is sleeved in the presser foot shaft sleeve 3015, the presser foot shaft 3014 comprises a first connecting end and a second connecting end 30141, the first connecting end and the second connecting end 30141 respectively penetrate out of the presser foot shaft sleeve 3015, and the first connecting end is connected with the presser foot 302; the first rotary end 30121 is provided with a first connection hole 30127 matched with the second connection end 30141, and the first rotary end 30121 is sleeved on the second connection end 30141 through the first connection hole 30127, so that the first rotary end 30121 is rotatably connected to the presser foot shaft sleeve 3015.

Referring to fig. 7, fig. 7 is a schematic diagram of connection between the second crank 3013 and the presser foot shaft 3014, wherein the second crank 3013 is sleeved on the second connection end 30141, the second crank 3013 is provided with a second crank abutment protrusion 30131, the first rotation end 30121 is provided with a first protrusion 30125 matched with the second crank abutment protrusion 30131, when the first abutment end 30122 rotates along the first direction (Z-axis direction shown in fig. 2 and 3), the first rotation end 30121 is driven to rotate (with the presser foot shaft 3015 as a rotation center), when the first rotation end 30121 rotates, the first protrusion 30125 and the second crank abutment protrusion 30131 are driven to abut, the first protrusion 30125 pushes the second crank abutment protrusion 30131 to rotate, the second crank abutment protrusion 30131 drives the second crank 3013 to rotate, and because the second crank 3013 is sleeved on the second connection end 30141, the second crank 3013 can drive the presser foot shaft 3014 to rotate (when the presser foot shaft 3015 rotates relative to the presser foot shaft 3015), and drive the presser foot shaft 3014 to rotate or rotate when the presser foot shaft 302 to lower.

With continued reference to fig. 3, in the above-described embodiment of the present application, the first rotation link 301 may further include a presser foot link arm 3016, one end of the presser foot link arm 3016 is vertically connected to the first link end of the presser foot shaft 3014 (the presser foot shaft 3014 extends in the X-axis direction shown in fig. 3, and the presser foot link arm 3016 extends in the Y-axis direction shown in fig. 3), and the other end of the presser foot link arm 3016 is connected to the presser foot 302. When the second crank 3013 drives the presser foot shaft 3014 to rotate, the presser foot shaft 3014 drives the presser foot connecting arm 3016 to be lifted or put down, and the presser foot connecting arm 3016 synchronously drives the presser foot 302 to be lifted or put down.

Referring to fig. 8, fig. 8 is a schematic structural diagram of the first driving plate 3012, the first driving plate 3012 includes a first rotating end 30121 and a first abutting end 30122, the first rotating end 30121 is provided with a first connecting hole 30127 to rotatably connect the first driving plate 3012 and the presser foot shaft 3014, the first abutting end 30122 has an arc-shaped slot 30123, and the first crank 3011 is close to the first abutting end 30122 and abuts against a slot wall of the arc-shaped slot 30123 to drive the first driving plate 3012 to rotate.

Referring to fig. 9, fig. 9 is a schematic structural view of the first crank 3011, the first crank 3011 includes a first crank connecting hole 30111, and the first crank 3011 is sleeved on the driving shaft 201 through the first crank connecting hole 30111. In an embodiment of the present application, the presser foot lifting mechanism 300 may further include a cam follower 304, one end of the cam follower 304 is connected to the first crank 3011, and the other end of the cam follower 304 is configured to abut against the first abutting end 30122; wherein cam follower 304 is proximate first abutment end 30122 and abuts a wall of arcuate slot 30123.

Referring to fig. 10, fig. 10 is an enlarged view of a portion B (the first mating connector 303) in fig. 1; in the embodiment of the present application, the first abutting end 30122 is provided with a second connecting hole 30128, and the presser foot lifting mechanism 300 may further include a first mating connector 303, where the first mating connector 303 is used for mating with the first rotating connector 301, so as to ensure that the first rotating connector 301 can rotate on the housing 100 while the first rotating connector 301 is mounted on the housing 100. The first matching connecting piece 303 comprises a connecting plate 3031, a movable connecting column 3032 and a first connecting bolt 3033, one end of the connecting plate 3031 is rotatably connected to the shell 100 through the first connecting bolt 3033, a plurality of connecting column matching holes are formed in the other end of the connecting plate 3031 at intervals, one end of the movable connecting column 3032 is connected with the connecting column matching holes, and the other end of the movable connecting column 3032 is connected with the second connecting hole 30128; when the first crank 3011 approaches the first abutting end 30122 and drives the first abutting end 30122 to rotate along a first direction (a Z-axis direction shown in fig. 10), the first abutting end 30122 drives the movable connection column 3032 to move, and the movable connection column 3032 drives the other end of the connection plate 3031 to rotate. The first mating connector 303 connects the first drive plate 3012 to the housing 100 while ensuring rotation of the first drive plate 3012.

In the above-described embodiment of the present application, the first mating connector 303 may further include a first return spring 3034, and the first return spring 3034 is disposed at the connection between the first connection bolt 3033 and the connection plate 3031, so that the other end of the connection plate 3031 is returned after completing the rotation.

In the above embodiment of the present application, the presser foot lifting mechanism 300 may further include a limiting member 305, the limiting member 305 is disposed on the housing 100, the limiting member 305 includes a first limiting end 3051 and a second limiting end 3052, the first limiting end 3051 and the second limiting end 3052 are disposed at an interval in the Z-axis direction, the other end of the connecting plate 3031 is located between the first limiting end 3051 and the second limiting end 3052, and when the other end of the connecting plate 3031 swings back and forth in the Z-axis direction, the connecting plate will abut against the first limiting end 3051 and the second limiting end 3052, so as to achieve the purpose of limiting the swinging of the connecting plate 3031.

Referring to fig. 11, fig. 11 is a schematic structural view of a limiting mechanism; in the embodiment of the application, the sewing machine further includes a limiting mechanism 500, the limiting mechanism 500 includes a mounting member 501, a shock-absorbing limiting member 502 and a second connecting bolt 503, the mounting member 501 may be an L-shaped connecting plate, and includes a vertical plate and a transverse plate, and the vertical plate is connected to the housing 100 through the second connecting bolt 503; a second protrusion 30126 is arranged on the first abutting end 30122 of the first driving plate 3012, and the transverse plate is located above the second protrusion 30126 (above the second protrusion 30126 shown in fig. 11) and opposite to the second protrusion 30126; the damping limiting part 502 is arranged on the transverse plate and penetrates through the transverse plate, and the damping limiting part 502 can be a rubber part; when the first abutting end 30122 rotates in a first direction (a Z-axis direction shown in fig. 11), the second protrusion 30126 contacts the shock absorbing limiting part 502, and the shock absorbing limiting part 502 can limit the first abutting end 30122, reduce vibration of the first abutting end 30122, and reduce noise.

Referring to fig. 2, 4 and 6, in the present embodiment, the second rotary joint 401 includes a third crank 4011, a second drive plate 4012, and a shear spool 4013; the third crank 4011 is sleeved on the driving shaft 201, and the driving shaft 201 drives the third crank 4011 to rotate; the second driving plate 4012 is rotatably connected to the housing 100, the second driving plate 4012 comprises a second abutting end 40121 and a second rotating end 40123, the third crank 4011 rotates and is close to the second abutting end 40121 to drive the second abutting end 40121 to rotate, and the second abutting end 40121 drives the second rotating end 40123 to rotate when rotating; one end of the thread cutting spool 4013 is rotatably connected to the second rotating end 40123, and the other end of the thread cutting spool 4013 is connected to a thread trimmer 402.

The second rotary connecting member 401 may further include a second mating connecting member 403, the second mating connecting member 403 includes a fourth connecting bolt 4031 and a spacer 4032, the second driving plate 4012 further includes an intermediate rotary connecting end 40122, the intermediate rotary connecting end 40122 is located between the second abutting end 40121 and the second rotary end 40123, a third connecting hole 40125 is provided on the intermediate rotary connecting end 40122, the intermediate rotary connecting end 40122 is rotatably connected to the housing 100 through the third connecting hole 40125 by the fourth connecting bolt 4031, the spacer 4032 is provided between the fourth connecting bolt 4031 and the intermediate rotary connecting end 40122, and the second driving plate 4012 can rotate with the fourth connecting bolt 4031 as a rotation center.

As shown in fig. 4, when the driving shaft 201 rotates counterclockwise (counterclockwise in fig. 4), the third crank 4011 abuts against the second abutting end 40121 when rotating in the direction a, and drives the second abutting end 40121 to rotate in the direction b; at this time, the second rotating end 40123 is driven by the second abutting end 40121 to rotate in the direction c, and the thread cutting shaft 4013 is rotatably connected to the housing 100, so that when the second rotating end 40123 rotates in the direction c, the thread cutting shaft 4013 rotates in the direction d, and at the same time, the thread cutting blade 402 is driven to rotate in the direction d.

Referring to fig. 12 and 13, fig. 12 is a schematic structural view of the second driving plate, and fig. 13 is a schematic structural view of the rotating fitting; in the above-mentioned embodiment of this application, be provided with on the second rotatory end 40123 and connect logical groove 40124, second rotation connecting piece 401 still includes running fitting piece 4014, and trimming axle 4013 includes trimming sword link end and trimming axle link end 40131, and the trimming sword link end is connected with trimming sword 402, and running fitting piece 4014 rotates with being connected logical groove 40124 and is connected, and trimming axle link end 40131 rotates with second rotatory end 40123 through running fitting piece 4014 and is connected.

The rotating matching piece 4014 comprises a third connecting end and a fourth connecting end, and the third connecting bolt 40142 penetrates through the third connecting end and is connected in the connecting through groove 40124; a fourth connecting hole matched with the connecting end 40131 of the trimming shaft is formed in the fourth connecting end, and the connecting end 40131 of the trimming shaft is connected with the fourth connecting hole; therefore, the second rotating end 40123 drives the third connecting end to rotate, and the fourth connecting end drives the trimming shaft 4013 to rotate.

It should be noted that the rotating fitting 4014 is provided with a fastening connection hole 40141 penetrating through the rotating fitting 4014, and the connection bolt can screw down the rotating fitting 4014 through the fastening connection hole 40141.

Referring to fig. 12, the second abutting end 40121 has a bending plate, and the third crank 4011 is close to the second abutting end 40121 and abuts against the bending plate.

Referring to fig. 4, 6 and 10, in the embodiment of the present application, the wire cutting mechanism 400 further includes a return assembly 404, the return assembly includes a second return spring 4041 and a spring fixing piece 4042, the spring fixing piece 4042 is connected to the housing 100, one end of the second return spring 4041 is connected to the spring fixing piece 4042, the other end of the second return spring 4041 is connected to the rotation mating piece 4014, and specifically, the other end of the second return spring 4041 may be connected to the third connecting bolt 40142. After the thread cutting spool 4013 drives the thread cutting knife 402 to complete the engagement with the fixed knife, the thread cutting spool 4013 can automatically return due to the elastic return action of the second return spring 4041.

Referring to fig. 6 and 14, fig. 14 is a schematic structural view of the third crank; in the embodiment of the application, the third crank 4011 comprises a third crank connecting hole 40111 and a fastening connecting bolt 40112, the third crank 4011 is sleeved on the driving shaft 201 through the third crank connecting hole 40111, and the third crank 4011 is screwed through the fastening connecting bolt 40112, so that the third crank 4011 can rotate along with the rotation of the driving shaft 201. Wire cutting mechanism 400 may further include a rod end ball 405, the rod end ball 405 includes a rod end connector 4051 and a ball 4052, a connecting rod end of the ball 4052 is connected to the third crank 4011 through the rod end connector 4051, and an outer spherical surface of the ball 4052 is close to the second abutting end 40121 and abuts against the bending plate.

In summary, the embodiment of the present application provides a sewing machine, in which a control mechanism is electrically connected to a driving mechanism 200, and is configured to control a driving shaft 201 of the driving mechanism 200 to rotate at a preset speed by a preset angle; the presser foot lifting mechanism 300 comprises a first rotating connecting piece 301, the thread trimming mechanism 400 comprises a second rotating connecting piece 401, one end of the first rotating connecting piece 301 and one end of the second rotating connecting piece 401 are both connected to the driving shaft 201, and one end of the first rotating connecting piece 301 and one end of the second rotating connecting piece 401 are arranged on the driving shaft 201 at intervals along the axial direction of the driving shaft 201; the other end of the first rotating connecting piece 301 is provided with a presser foot 302, the presser foot 302 is positioned above the work table board 101 arranged on the shell 100, and the first rotating connecting piece 301 can drive the presser foot 302 to be close to or far away from the work table board 101 when the driving shaft 201 rotates; the other end of the second rotating connector 401 is provided with a thread trimmer 402, and when the driving shaft 201 rotates, the second rotating connector 401 can drive the thread trimmer 402 to be meshed with a fixed cutter arranged on the working table plate 101. The sewing machine of the embodiment of the application is simple in structure, the presser foot lifting mechanism 300 and the thread cutting mechanism 400 are driven to work simultaneously through the driving mechanism 200, and the rotating angle and the rotating speed of the driving mechanism 200 are set in advance through the control mechanism, so that the response speed of the thread cutting knife 402 is controlled, the arbitrary meshing amount of the thread cutting knife 402 and the fixed knife in the practical range is controlled, and the presser foot 302 is controlled to lift up and descend at any height in the practical range, the accurate matching and quick response of the presser foot action and the thread cutting action are realized, the problem of lagging of the thread cutting action in advance is solved, and the sewing precision and the sewing efficiency are improved.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

In general, terms should be understood at least in part by their use in context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending, at least in part, on the context. Similarly, terms such as "a" or "the" may also be understood to convey a singular use or to convey a plural use, depending, at least in part, on the context.

It should be readily understood that "on 8230; \8230on", "on 82308230;," on 82308230; \823030ja above "and" on 8230; \8230on "in the present disclosure should be interpreted in the broadest manner so that" on 8230; "on not only means" directly on something ", but also includes the meaning of" on something "with intermediate features or layers in between, and" above 8230or "above 8230" \8230 "; not only includes the meaning of" above something "or" above "but also includes the meaning of" above something "or" above "with no intervening features or layers therebetween (i.e., directly on something).

Furthermore, spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's illustrated relationship to another element or feature. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly as well.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A sewing machine is characterized by comprising a shell, a control mechanism, a driving mechanism, a presser foot lifting mechanism and a thread trimming mechanism, wherein the control mechanism, the driving mechanism, the presser foot lifting mechanism and the thread trimming mechanism are arranged on the shell;

the control mechanism is electrically connected with the driving mechanism and is used for controlling a driving shaft of the driving mechanism to rotate at a preset speed by a preset angle;

the presser foot lifting mechanism comprises a first rotating connecting piece, the thread cutting mechanism comprises a second rotating connecting piece, one end of the first rotating connecting piece and one end of the second rotating connecting piece are both connected to the driving shaft, and one end of the first rotating connecting piece and one end of the second rotating connecting piece are arranged on the driving shaft at intervals along the axial direction of the driving shaft;

the other end of the first rotating connecting piece is provided with a presser foot, the shell comprises a working table plate, the presser foot is positioned above the working table plate, and the first rotating connecting piece drives the presser foot to be close to or far away from the working table plate;

the other end of the second rotating connecting piece is provided with a thread cutter, the working table plate is provided with a fixed cutter, and the second rotating connecting piece drives the thread cutter to be meshed with the fixed cutter.

2. The sewing machine of claim 1, wherein the first rotational connection comprises a first crank, a first drive plate, a second crank, a presser foot shaft, and a presser foot bushing;

the first crank is connected to the driving shaft, the first driving plate comprises a first abutting end, the first abutting end is movably connected to the shell, and the driving shaft drives the first crank to be close to the first abutting end and drives the first abutting end to rotate;

the presser foot shaft sleeve is fixedly connected to the shell, the presser foot shaft is arranged in the presser foot shaft sleeve, a first connecting end and a second connecting end of the presser foot shaft respectively penetrate out of the presser foot shaft sleeve, and the first connecting end is connected with the presser foot;

the first driving plate further comprises a first rotating end, the first rotating end is provided with a first connecting hole matched with the second connecting end, and the first rotating end rotates around the presser foot shaft;

the second crank is connected the second link, just it is protruding to be provided with the second crank butt on the second crank, first rotation end be provided with the protruding matched with first arch of second crank butt.

3. The sewing machine of claim 2, wherein the second rotational connection comprises a third crank, a second drive plate, and a shear spool;

the third crank is connected to the driving shaft, the second driving plate is rotatably connected to the shell and comprises a second abutting end and a second rotating end, and the driving shaft drives the third crank to be close to the second abutting end and drives the second abutting end to rotate;

one end of the thread cutting shaft is rotatably connected with the second rotating end, and the other end of the thread cutting shaft is connected with the thread cutter.

4. The sewing machine of claim 3, wherein the second rotating end is provided with a connecting through slot, the second rotating connector further comprising a rotating fitting, and one end of the shear wire shaft is rotatably connected with the second rotating end through the rotating fitting;

the rotation fitting piece comprises a third connecting end and a fourth connecting end, the third connecting end is connected in the connecting through groove, the fourth connecting end is provided with a fourth connecting hole matched with one end of the thread cutting shaft, the second rotating end drives the third connecting end to rotate, and meanwhile, the fourth connecting end drives the thread cutting shaft to rotate.

5. The sewing machine of claim 4, wherein the thread trimming mechanism further comprises a second return spring, one end of the second return spring being connected to the housing, the other end of the second return spring being connected to the third connecting end.

6. The sewing machine of claim 2, further comprising a limiting mechanism, wherein the limiting mechanism comprises an installation member and a shock-absorbing limiting member, the installation member is disposed on the housing, the shock-absorbing limiting member is disposed on the installation member, and the shock-absorbing limiting member is opposite to the first abutting end.

7. The sewing machine of claim 2, wherein the first abutment end has an arcuate slot, and the first crank is proximate the first abutment end and abuts a slot wall of the arcuate slot.

8. The sewing machine of claim 7, wherein the first rotational connection further comprises a cam follower having one end connected to the first crank and another end adjacent the first abutting end and abutting a wall of the arcuate slot.

9. The sewing machine of claim 3, wherein the second drive plate further comprises an intermediate rotation connection end, the intermediate rotation connection end being located between the second abutting end and the second rotating end, wherein a third connection hole is provided in the intermediate rotation connection end, wherein a second connection bolt connects the second drive plate to the housing through the third connection hole, and wherein the second drive plate is rotatable about the second connection bolt;

the second abutting end is provided with a bending plate, and the third crank is close to the second abutting end and abuts against the bending plate.

10. The sewing machine of claim 9, wherein the second rotational connection further comprises a rod end ball, a connection rod end of the rod end ball is connected to the third crank, and an outer spherical surface of the rod end ball is adjacent to the first abutting end and abuts against the bending plate.

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