WO2021184646A1

WO2021184646A1 - Feed lifting rock shaft assembly and sewing machine provided with feed lifting rock shaft assembly

Info

Publication number: WO2021184646A1
Application number: PCT/CN2020/107004
Authority: WO
Inventors: 黄明学; 万义明; 林晓晓; 洪志敏
Original assignee: 杰克缝纫机股份有限公司
Priority date: 2020-03-19
Filing date: 2020-08-05
Publication date: 2021-09-23
Also published as: CN111197202B; CN111197202A

Abstract

A feed lifting rock shaft assembly, comprising a front feed lifting rock shaft (12) and a rear feed lifting rock shaft (18) that are arranged in parallel; the front feed lifting rock shaft is fixedly provided with a front feed lifting rock crank (14), and the rear feed lifting rock shaft is fixedly provided with a rear feed lifting rock crank (16); the front feed lifting rock crank is rotatably connected to a first end of a front feed lifting rock swing plate (20), and the rear feed lifting rock crank is rotatably connected to a first end of a rear feed lifting rock swing plate (21); and a second end of the front feed lifting rock swing plate and a second end of the rear feed lifting rock swing plate are both rotatably connected to one end of a driving device, respectively. After the driving device carries out driving, the included angle between the front feed lifting rock crank and the rear feed lifting rock crank changes so that the front feed lifting rock shaft and the rear feed lifting rock shaft rotate relative one another so as to adjust the height of a feed dog. The present invention also relates to a sewing machine provided with the described feed lifting rock shaft assembly. The feed lifting rock shaft assembly can conveniently and quickly control the height of a feed dog, thereby achieving the function of automatically adjusting the height of the teeth of the feed dog.

Description

Thread lifting shaft component and sewing machine with the thread lifting shaft component

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on March 19, 2020, the application number is 202010196339.9, and the invention title is "a thread-lifting shaft assembly and a sewing machine with the thread-lifting shaft assembly", all of which The content is incorporated in this application by reference.

Technical field

The present invention relates to the technical field of sewing equipment, in particular to a thread lifting shaft assembly and a sewing machine with the thread lifting shaft assembly.

Background technique

As we all know, the sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing materials. The sewing machine usually consists of a feeding device, a base, The transmission and accessories are composed of four parts, and the movement of each mechanism is reasonably coordinated, and the sewing material is stitched together.

In the prior art, for sewing machines, especially lockstitch machines, the horizontal movement direction of the feeding teeth is controlled by the feeding shaft, the vertical movement direction of the feeding teeth is controlled by the lifting shaft, and the phase of the horizontal and vertical directions is controlled by the feeding eccentricity. The wheel decides, and finally forms the elliptical trajectory of the feeding teeth. When the thickness of the sewing fabric changes, in order to achieve a better sewing effect, the height of the teeth needs to be adjusted. Nowadays, conventional sewing machines are complicated to adjust the tooth height and cannot be precisely controlled. When the fabric is placed at the beginning of the seam, the teeth are in a high position and the fabric will hang.

In summary, how to provide a sewing machine that can conveniently and quickly adjust the height of the feeding teeth is a technical problem that those skilled in the art need to think about.

Summary of the invention

The object of the present invention is to provide a thread-lifting shaft assembly and a sewing machine with the thread-lifting shaft assembly, which can conveniently and quickly control the height of the feeding teeth and realize the function of automatically adjusting the height of the feeding teeth.

In order to achieve the above-mentioned object, the present invention provides a tooth lifting shaft assembly, comprising a front tooth lifting shaft and a rear tooth lifting shaft arranged in parallel, the front tooth lifting shaft is fixedly provided with a front tooth lifting crank, and the rear tooth lifting shaft is fixed A rear tooth lifting crank is provided, the front tooth lifting crank is rotatably connected to the first end of the front tooth lifting swing plate, the rear tooth lifting crank is rotatably connected to the first end of the rear tooth lifting swing plate, the front tooth lifting swing plate The second end of the rear tooth lifting swing plate and the second end of the rear tooth lifting swing plate are respectively rotatably connected to one end of the driving device; after being driven by the driving device, both the front tooth lifting crank and the rear tooth lifting crank The included angle between the two is changed so that the front lifting shaft and the rear lifting shaft can rotate relative to each other to adjust the height of the feeding teeth.

Optionally, the driving device includes a driving part and a tooth lifting adjustment swing link, and both the front tooth lifting swing plate and the rear tooth lifting swing plate are respectively rotatably connected to one end of the tooth lifting adjustment swing link The tooth-lifting adjustment swing link is connected to the driving part through a transmission device, and when the driving part is driven, the tooth-lifting adjustment swing link swings.

Optionally, the transmission device includes a rocker, a driving connecting rod, and a driving crank. The first position of the driving crank is fixedly connected to the output shaft of the driving part, and the second position of the driving crank is rotatably connected to the driving crank. The first end of the drive link, the second end of the drive link is rotatably connected to the first position of the rocker, and the second position of the rocker is rotatably connected to the tooth lifting adjustment swing link, the The third position of the rocker is rotatably connected to the fixed end.

Optionally, the transmission device is specifically an adjusting eccentric wheel, the output shaft of the driving part is fixed to the eccentric hole of the adjusting eccentric wheel, and the end of the tooth lifting adjusting swing link is connected to the adjusting eccentric wheel. wheel.

Optionally, the first position of the rocker and the third position of the rocker are respectively located at both ends of the rocker, and the second position of the rocker is located at the first position and the third position of the rocker. Between the third position of the rocker.

Optionally, the driving device further includes a bracket, the driving part is mounted on the bracket, and the third position of the rocker is rotatably connected to the bracket.

Optionally, the front lifting crank includes a front locking end and a front extension end, the front locking end is connected to the front extension end, and the front locking end surrounds the front lifting shaft, The front extension end extends along the radially outer side of the front lifting shaft, and/or;

The rear lifting crank includes a rear locking end and a rear extension end, the rear locking end is connected to the rear extension end, the rear locking end is wrapped around the rear lifting shaft, and the rear extension The end extends along the radially outer side of the rear lifting shaft.

Optionally, the front lifting crank is provided with a front through groove extending in the radial direction of the front lifting shaft, and one end of the front lifting swing plate extends into the front through groove and passes along the The axially extending front tooth lifting crank pin of the front tooth lifting shaft rotatably connects the front tooth lifting crank and the front tooth lifting swing plate, and the other end of the front tooth lifting swing plate and the driving device Rotate the connection on one side,

and / or;

The rear tooth lifting crank is provided with a rear through groove extending in the radial direction of the rear tooth lifting shaft, and one end of the rear tooth lifting swing plate extends into the rear through groove and passes along the rear tooth lifting shaft. The axially extending rear tooth lifting crank pin of the shaft rotatably connects the rear tooth lifting crank and the rear tooth lifting swing plate, and the other end of the rear tooth lifting swing plate and the other side of the driving device Rotate the connection.

Optionally, the front lifting shaft and the rear lifting shaft are arranged coaxially, the front lifting crank and the rear lifting crank have the same shape and size, and the two are moving along the front lifting The projection of the axial direction of the tooth shaft shows a herringbone distribution.

The present invention also provides a sewing machine, which includes any one of the above-mentioned shaft assembly.

Compared with the above-mentioned background technology, the tooth lifting shaft assembly provided by the present invention includes a front lifting shaft and a rear lifting shaft, which replaces a lifting shaft in the prior art, and the front lifting shaft is fixed with a front lifting crank. The rear tooth lifting shaft is fixed with a rear tooth lifting crank, the front tooth lifting crank is rotatably connected with a front tooth lifting swing plate, the rear tooth lifting crank is rotatably connected with a rear tooth lifting swing plate, both the front tooth lifting swing plate and the rear tooth lifting swing plate Rotate and connect to the two ends of the driving device respectively; when the driving device is actuated, that is, driven by the driving device, the angle between the front crank and the rear crank changes, that is, the front crank and the rear crank The relative rotation between the two tooth shafts occurs, and the phase angles of the front lifting tooth shaft and the rear lifting tooth shaft are changed, thereby achieving the purpose of adjusting the height of the feeding tooth. In short, in the present application, the gear lifting shaft is set as a split type, and the phases of the front lifting shaft and the rear lifting shaft can be adjusted according to the sewing conditions, thereby controlling the height of the feeding teeth. At the same time, according to actual needs, when placing the fabric, the height of the feeding dog can be lowered below the needle plate to avoid hanging the feeding dog.

The sewing machine provided by the present invention has the above-mentioned beneficial effects, which will not be repeated here.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings may be obtained according to the provided drawings without creative work.

Figure 1 is a front view of a sewing machine with a tooth-lifting shaft assembly provided by an embodiment of the present invention;

Figure 2 is a bottom view of a sewing machine with a pivot assembly provided by an embodiment of the present invention;

FIG. 3 is a structural diagram of a first specific implementation of a tooth lifting shaft assembly provided by an embodiment of the present invention; FIG.

Figure 4 is an exploded view of the first specific implementation of the tooth lifting shaft assembly provided by the embodiment of the present invention;

Figure 5 is an exploded view of the driving device in Figure 4;

Figure 6 is a structural diagram of the rocker in Figure 5;

7 is a schematic diagram of the first specific implementation of the tooth lifting shaft assembly provided by the embodiment of the present invention when the feeding tooth is at the highest point;

8 is a schematic diagram of the first specific implementation of the tooth lifting shaft assembly provided by the embodiment of the present invention when the feeding tooth is at the lowest point;

FIG. 9 is a structural diagram of a second specific implementation of the tooth lifting shaft assembly provided by the embodiment of the present invention;

Fig. 10 is an exploded view of the second specific implementation of the tooth lifting shaft assembly provided by the embodiment of the present invention.

in:

Upper shaft 1, driving part 2, feeding assembly 3, lifting shaft assembly 4, feeding swing plate seat assembly 5, feeding shaft 6, lifting fork crank 7, feeding eccentric 8, lifting connecting rod 9, feeding connecting rod 10. Rear crank 11, front lift shaft 12, front lift shaft sleeve 13, front lift crank 14, lift adjustment pin 15, rear lift crank 16, rear lift shaft sleeve 17, rear lift shaft 18. Front lifting crank pin 19, front lifting swing plate 20, rear lifting swing plate 21, rear lifting crank pin 22, lifting adjustment swing link 24, swing link pin 25, rocker 26, first Connecting hole 261, second connecting hole 262, third connecting hole 263, connecting rod pin 27, axial connecting piece 28, driving connecting rod 29, driving crank 30, bracket 31, feed dog 32, needle plate 33, adjusting eccentric wheel 301.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Example one:

An embodiment of the present invention provides a tooth lifting shaft assembly, as shown in Figures 1 to 4 of the specification, including a front lifting shaft 12 and a rear lifting shaft 18, and the front lifting shaft 12 and the rear lifting shaft 18 are arranged in parallel . One end of the feeding shaft 6 is fixedly connected to the feeding assembly 3, and the other end of the feeding shaft 6 is fixedly connected to the feeding swing plate seat assembly 5.

The feeding assembly 3 is used to control the movement trajectory of the feeding teeth 32, the lifting spindle assembly 4 is used to complete the lifting phase adjustment, and the feeding swing plate seat assembly 5 completes the feeding phase change. The key improvement part of this application is the lifting spindle assembly 4.

With reference to the prior art, it can be known that the feeding eccentric 8 is fixed on the upper shaft 1, one end of the lifting link 9 is rotatably connected to the feeding eccentric 8, and the other end of the lifting link 9 is rotatably connected to the crank 11 after lifting the teeth. One end of the feeding link 10 is rotatably connected to the feeding eccentric 8, and the other end of the feeding link 10 is rotatably connected to the feeding swing plate seat assembly 5; of course, the lifting link 9 and the feeding link 10 are respectively rotatably connected to the feeding eccentric 8 different positions.

The fork type crank 7 is fixed on the front lifting shaft 12, the rear crank 11 is fixed on the rear lifting shaft 18, the front lifting shaft 12 and the front lifting crank 14 are fixedly connected, and the rear lifting shaft is fixed. 18 and the rear lifting crank 16 are fixedly connected, the front lifting crank 14 is rotatably connected to the first end of the front lifting swing plate 20, and the rear lifting crank 16 is rotatably connected to the first end of the rear lifting swing plate 21.

The second end of the front lifting swing plate 20 and the second end of the rear lifting swing plate 21 are connected by a driving device, and one end of the driving device is respectively connected to the front lifting swing plate 20 and the rear lifting swing plate 21, that is, through The driving device connects the front lifting swing plate 20 and the rear lifting swing plate 21. Obviously, it can be considered that the front lifting spindle 12 and the rear lifting spindle 18 are connected by the driving device. Among them, the second end of the front lifting swing plate 20 and the second end of the rear lifting swing plate 21 can be respectively arranged on both sides of the driving device, and both can also be arranged on one side of the driving device or the second end of the driving device. Inside.

Driven by the driving device, the angle between the front crank 14 and the rear crank 16 changes, that is, the relative rotation between the front crank 12 and the rear crank 18 changes the phase angle of the two , So as to adjust the height of the feeding teeth 32, as shown in Fig. 7 and Fig. 8 of the specification.

For the driving device, it can use stepper motors, piston cylinders, servo motors and other power and cases to provide power, and can achieve power transmission through transmission mechanisms such as timing belts, gear transmissions, worm gears, and so on.

With reference to Figures 4 to 8 of the specification, the driving device includes a driving part 2 and a tooth-lifting adjustment swing link 24. The driving part 2 can be configured as a stepping motor, a piston cylinder, a servo motor, and the like. The swing connecting rod 24 and the driving part 2 can be connected by a timing belt, gear transmission, worm gear and other transmission devices to realize power transmission. The front crank 14 and the rear crank 16 are respectively located at the crank Adjust both sides of one end of the swing link 24.

Obviously, the second end of the front lifting swing plate 20 and the second end of the rear lifting swing plate 21 are respectively rotatably connected to one end of the lifting adjustment swing link 24, and the second end of the front lifting swing plate 20 and Both the second ends of the rear tooth lifting swing plate 21 may be located on both sides of the tooth lifting adjustment swing link 24, or on the same side.

The front lifting crank 14 can be fixed to the end of the front lifting shaft 12, the rear lifting crank 16 can be fixed to the end of the rear lifting shaft 18, and the front lifting crank 14 and the rear lifting crank 16 are arranged adjacent to each other. That is, the front lifting crank 14 and the rear lifting crank 16 are respectively located on both sides of one end of the lifting adjusting swing link 24.

When the swing link 24 for adjusting the tooth lifting moves under the action of the driving part 2, it simultaneously drives the front lifting swing plate 20 and the rear lifting swing plate 21 to move, thereby driving the front lifting crank 14 and the rear lifting crank 16 to adjust The angle between the front lifting crank 14 and the rear lifting crank 16 changes the phase angle between the front lifting spindle 12 and the rear lifting spindle 18, thereby adjusting the height of the feeding teeth 32.

The transmission device includes a rocker 26, a driving connecting rod 29 and a driving crank 30. The first position of the driving crank 30 is fixedly connected with the output shaft of the driving part 2. When the driving part 2 moves, the output shaft rotates, driving the driving crank 30 to rotate synchronously .

The second position of the driving crank 30 is rotatably connected to the first end of the driving link 29, the second end of the driving link 29 is rotatably connected to the first position of the rocker 26, and the second position of the rocker 26 is rotatably connected to the lifting and adjusting swing The third position of the connecting rod 24 and the rocker 26 is rotatably connected to the fixed end.

Obviously, when the output shaft of the driving part 2 rotates, the drive crank 30 rotates and swings, which drives the drive link 29 to swing, and then drives the rocker 26 to swing, and finally realizes the movement of the swing link 24 for adjusting the teeth lifting and adjusting the front teeth lifting crank The included angle between 14 and the rear crank 16.

The first position of the rocker 26 and the third position of the rocker 26 are respectively located at two ends of the rocker 26, and the second position of the rocker 26 is located between the first position of the rocker 26 and the third position of the rocker 26. As shown in Fig. 6 of the specification, the first connecting hole 261 is used to insert the connecting rod pin 27, the connecting rod pin 27 rotationally connects the rocker 26 and the driving connecting rod 29, and the second connecting hole 262 is used to insert the swing connecting rod pin 25 to swing. The connecting rod pin 25 rotatably connects the rocker 26 and the tooth lifting adjustment swing link 24. The third connecting hole 263 is used for inserting the axial connection member 28, and the axial connection member 28 rotatably connects the rocker 26 to the fixed end.

Referring to Fig. 5 of the specification, the driving part 2 can be installed on the bracket 31, and the bracket 31 is provided with a mounting hole. The shaft connector 28 cooperates with the mounting hole to connect the rocker 26 to the bracket 31 in rotation.

The front lifting crank 14 includes a front locking end and a front extension end. The front locking end and the front extension end are connected. The front locking end surrounds the front lifting shaft 12, and the front extension end is along the radial direction of the front lifting shaft 12 Extending from the outside, the front lifting shaft 12 can also be provided with a front lifting shaft sleeve 13 which can be arranged on the bottom plate of the sewing machine.

The front lifting crank 14 can be integrally arranged. After bending, a front locking end and a front extension end are formed. The front locking end and the front lifting shaft 12 can be locked by screws, etc. The front extension end is used to swing with the front lifting teeth The plate 20 is connected in rotation.

Obviously, the front extension end and the end of the front lifting swing plate 20 should be provided with a rotating shaft hole, so that the front lifting crank pin 19 penetrates the rotating shaft hole to realize the rotation between the front lifting crank 14 and the front lifting swing plate 20 connect.

Similar to the front lifting crank 14, the rear lifting crank 16 includes a rear locking end and a rear extension end. The rear locking end and the rear extension end are connected, and the rear locking end is wrapped around the rear lifting shaft 18, and the rear extension end It extends along the radially outer side of the rear lifting shaft 18. The rear lifting shaft 18 may also be provided with a rear lifting shaft sleeve 17, and the rear lifting shaft sleeve 17 may be provided on the bottom plate of the sewing machine.

The rear tooth lifting crank 16 can be integrally arranged. After bending, a rear locking end and a rear extension end are formed. The rear locking end and the rear lifting shaft 18 can be locked by screws or the like, and the rear extension end is used to swing with the rear lifting tooth The plate 21 is connected in rotation.

Obviously, the rear extension end and the end of the rear tooth lifting swing plate 21 should obviously also be provided with a shaft hole, so that the rear tooth lifting crank pin 22 penetrates the shaft hole to realize the difference between the rear tooth lifting crank 16 and the rear tooth lifting swing plate 21 Rotating connection between.

On the above basis, the front extension end of the front lifting crank 14 may be provided with a front through groove, which extends along the radial direction of the front lifting shaft 12, and one end of the front lifting swing plate 20 extends into the front through groove. The tooth-lifting crank pin 19 extends axially along the front tooth-lifting shaft 12 and passes through a front through groove to rotatably connect the front-lifting swing plate 20 and the front extension end of the front tooth-lifting crank 14.

The other end of the front lifting swing plate 20 and the lifting adjusting swing link 24 can be rotatably connected by the lifting adjusting pin 15.

The rear extension end of the rear tooth lifting crank 16 can be provided with a rear through groove, which extends along the radial direction of the rear lifting shaft 18, one end of the rear lifting swing plate 21 extends into the rear through groove, and the rear lifting crank pin 22 It extends axially along the rear tooth-lifting shaft 18 and passes through a rear through groove to rotatably connect the rear tooth-lifting swing plate 21 and the rear extension end of the rear tooth-lifting crank 16.

The other end of the rear tooth lifting swing plate 21 and the tooth lifting adjusting swing link 24 can be rotatably connected by the tooth lifting adjusting pin 15.

It can be seen that the arrangement of the front lifting crank 14, the front lifting crank pin 19 and the front lifting swing plate 20 is similar to the rear lifting crank 16, the rear lifting swing plate 21 and the rear lifting crank pin 22. The way the person is set up.

The front lifting shaft 12 and the rear lifting shaft 18 can be arranged coaxially. The shape and size of the front lifting crank 14 and the rear lifting crank 16 are the same, and the projections of the two in the axial direction of the front lifting shaft 12 The top is herringbone distribution.

In the normal sewing state, the driving part 2 is energized and locked, and the rocker 26 is fixed in a position at this time, and the feeding dog 32 is at the highest point as an example. At this time, the mechanism state is shown in FIG. 7. In this state, the front lifting swing plate 20 and the rear lifting swing plate 21 are in a straight line, and the angle between the front lifting crank 14 and the rear lifting crank 16 is the largest.

When the upper shaft 1 drives the feeding eccentric 8 to rotate, the tooth-lifting connecting rod 9 drives the tooth-lifting crank 11 to swing, and the swinging action of the tooth-lifting crank 11 is transmitted to the driving rear-lifting crank 16 through the rear-lifting shaft 18, so that The rear tooth-lifting crank 16 swings, and the front tooth-lifting swing plate 20, the rear-tooth-lifting swing plate 21 and the tooth-lifting adjustment swing link 24 drive the front-tooth-lifting crank 14 to swing at the same swing amplitude, and the front-tooth-lifting crank 14 passes the front tooth-lifting The shaft 12 drives the tooth-lifting fork-shaped crank 7 to swing to realize the reciprocating movement of the feeding tooth in the vertical direction.

The power of the feeding eccentric wheel 8 passes through the feeding connecting rod 10, the feeding swing plate seat assembly 5 and the feeding shaft 6, and finally drives the feeding dog 32 to reciprocate in the horizontal direction, and finally realizes the sewing movement track of the feeding dog 32.

Before sewing starts, when the presser foot is raised to place the sewing cloth, the driving part 2 rotates clockwise, and the mechanism is in the state where the feeding teeth are at the lowest point, as shown in Fig. 8 of the manual. In this state, the feed dog 32 is under the needle plate 33, and the cloth will not be caught by the teeth during the cloth placement process.

When the sewing conditions change and the height of the feeding dog 32 needs to be adjusted, the drive crank 30 rotates clockwise and can stop within the angle range corresponding to FIG. 8 and FIG. 7. When the drive crank 30 stops at a different position, The phase angle between the front lifting crank 14 and the rear lifting crank 16 is different (compare Fig. 7 and Fig. 8). The larger the phase angle, the higher the height of the feed dog 32, and the smaller the phase angle is. The lower the height of the feeding dog 32 is, so that the height adjustment of the feeding dog 32 is realized.

Embodiment two:

The difference from the first embodiment above is that the driving part 2 can directly adjust the eccentric wheel 301 to realize the change of the included angle between the front lifting crank 14 and the rear lifting crank 16; specifically, the output shaft of the driving part 2 is fixed. The eccentric hole is provided in the adjusting eccentric wheel 301, and the end of the tooth lifting adjusting swing link 24 is connected to the adjusting eccentric wheel 301.

When the driving part 2 moves, the output shaft of the driving part 2 rotates, driving the adjustment eccentric 301 to rotate. Since the eccentric hole of the adjustment eccentric 301 is fixedly connected with the output shaft of the driving part 2, when the adjustment eccentric 301 rotates, the adjustment The side edge of the eccentric wheel 301 does not rotate around a fixed axis, but will swing, thereby driving the lifting adjustment swing link 24 to swing, thereby changing the angle between the front lifting crank 14 and the rear lifting crank 16 , So that the front lifting shaft 12 and the rear lifting shaft 18 are relatively rotated, as shown in FIG. 9 and FIG. 10 of the specification.

In addition, the front extension end of the front lifting crank 14 may not be provided with a front through groove. The front lifting swing plate 20 is located on one side of the front extension end of the front lifting crank 14. The front lifting crank pin 19 can also be used to achieve the front The rotation connection of the tooth lifting crank 14 and the front tooth lifting swing plate 20 is as shown in FIG. 9 and FIG. 10 of the specification.

Similarly, the rotational connection between the rear-lifting crank 16 and the rear-lifting swing plate 21 can refer to the above-mentioned different forms, which will not be repeated here.

Embodiment three:

The present invention provides a sewing machine with a thread lifting shaft assembly, which includes the thread lifting shaft assembly described in the first and second embodiments; other parts of the sewing machine can refer to the prior art, and will not be expanded herein.

It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any such existence between these entities. The actual relationship or order.

The above is a detailed introduction to the thread lifting shaft assembly and the sewing machine provided with the thread lifting shaft assembly provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A tooth-lifting shaft assembly, characterized by comprising a front tooth-lifting shaft (12) and a rear tooth-lifting shaft (18) arranged in parallel, and the front tooth-lifting shaft (12) is fixedly provided with a front tooth-lifting crank (14) , The rear tooth lifting shaft (18) is fixedly provided with a rear tooth lifting crank (16), the front tooth lifting crank (14) is rotatably connected to the first end of the front tooth lifting swing plate (20), and the rear tooth lifting The crank (16) is rotatably connected to the first end of the rear swinging plate (21), the second end of the front swinging plate (20) and the second end of the rear swinging plate (21) One end connected to the driving device is respectively rotated; after being driven by the driving device, the angle between the front crank (14) and the rear crank (16) is changed, so that the front The tooth lifting shaft (12) and the rear tooth lifting shaft (18) rotate relative to each other to adjust the height of the feeding teeth.
The tooth-lifting shaft assembly according to claim 1, characterized in that the driving device comprises a driving part (2) and a tooth-lifting adjustment swing link (24), the front tooth-lifting swing plate (20) and the The two rear tooth lifting swing plates (21) are respectively rotatably connected to one end of the tooth lifting adjusting swing link (24), and the tooth lifting adjusting swing link (24) is connected to the driving part (2) through a transmission device , When the driving part (2) is driven, the tooth lifting adjusting swing link (24) swings.
The tooth lifting shaft assembly according to claim 2, characterized in that the transmission device comprises a rocker (26), a driving connecting rod (29) and a driving crank (30), the first of the driving crank (30) The position is fixedly connected with the output shaft of the driving part (2), the second position of the driving crank (30) is rotatably connected to the first end of the driving connecting rod (29), and the driving connecting rod (29) The second end of the rocker (26) is rotatably connected to the first position of the rocker (26), and the second position of the rocker (26) is rotatably connected to the tooth lifting adjustment swing link (24), the rocker (26) The third position is rotatably connected to the fixed end.
The tooth lifting shaft assembly according to claim 2, wherein the transmission device is specifically an adjusting eccentric wheel (301), and the output shaft of the driving part (2) is fixed to the adjusting eccentric wheel (301) The end of the tooth lifting adjusting swing link (24) is connected to the adjusting eccentric hole (301).
The tooth-lifting shaft assembly according to claim 3, wherein the first position of the rocker (26) and the third position of the rocker (26) are respectively located at two positions of the rocker (26). At the end, the second position of the rocker (26) is located between the first position of the rocker (26) and the third position of the rocker.
The tooth lifting shaft assembly according to claim 5, characterized in that the driving device further comprises a bracket (31), the driving part (2) is mounted on the bracket (31), and the rocker (26) The third position is rotatably connected to the bracket (31).
The lifting shaft assembly according to any one of claims 1-6, wherein the front lifting crank (14) comprises a front locking end and a front extension end, the front locking end and the front extension end The extension ends are connected, the front locking end wraps around the front lifting shaft (12), and the front extension end extends along the radial outside of the front lifting shaft (12), and/or;

The rear lifting crank (16) includes a rear locking end and a rear extension end, the rear locking end is connected to the rear extension end, and the rear locking end is wrapped around the rear lifting shaft (18). ), the rear extension end extends along the radially outer side of the rear lifting shaft (18).
The lifting shaft assembly according to claim 7, wherein the front lifting crank (14) is provided with a front through groove extending along the radial direction of the front lifting shaft (12), and the front lifting One end of the tooth swinging plate (20) extends into the front through groove, and the front tooth lifting crank ( 14) Rotatingly connected with the front tooth lifting swing plate (20), and the other end of the front tooth lifting swing plate (20) is rotationally connected with one side of the driving device,

and / or;

The rear tooth lifting crank (16) is provided with a rear through groove extending in the radial direction of the rear tooth lifting shaft (18), and one end of the rear tooth lifting swing plate (21) extends into the rear through groove , And rotate both the rear tooth lifting crank (16) and the rear tooth lifting swing plate (21) through the rear tooth lifting crank pin (22) extending along the axial direction of the rear tooth lifting shaft (18) Connected, the other end of the rear tooth lifting swing plate (21) is rotatably connected with the other side of the driving device.
The tooth lifting shaft assembly according to claim 8, wherein the front tooth lifting shaft (12) and the rear tooth lifting shaft (18) are coaxially arranged, and the front tooth lifting crank (14) and the rear tooth lifting shaft (18) are coaxially arranged. The shape and size of the two tooth lifting cranks (16) described later are the same, and the two are distributed in a herringbone shape on the projection along the axial direction of the front tooth lifting shaft (12).
A sewing machine, characterized by comprising the tooth lifting shaft assembly according to any one of claims 1-9.