CN111197203B

CN111197203B - Feed lifting thread trimming assembly and sewing machine with feed lifting thread trimming assembly

Info

Publication number: CN111197203B
Application number: CN202010196368.5A
Authority: CN
Inventors: 黄明学; 万义明; 林晓晓; 洪志敏
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2021-07-30
Anticipated expiration: 2040-03-19
Also published as: CN111197203A; WO2021184647A1

Abstract

The invention discloses a feed lifting tooth thread trimming assembly and a sewing machine with the feed lifting tooth thread trimming assembly, wherein the feed lifting tooth thread trimming assembly comprises a driving part, a front feed lifting tooth shaft and a rear feed lifting tooth shaft which are arranged in parallel, a front feed lifting tooth crank is fixedly arranged on the front feed lifting tooth shaft, a rear feed lifting tooth crank is fixedly arranged on the rear feed lifting tooth shaft, the front feed lifting tooth crank is rotationally connected with a first end of a front feed lifting tooth swinging plate, and the rear feed lifting tooth crank is rotationally connected with a first end of a rear feed lifting tooth swinging plate; the driving part is connected with a tooth lifting driving device and a trimming driving device, and the second end of the front tooth lifting swing plate and the second end of the rear tooth lifting swing plate are respectively connected with one end of the tooth lifting driving device in a rotating way; after being driven by the driving part, the height of the feeding tooth is adjusted; the trimming driving device is connected with the trimming driving part; after being driven by the driving part, the trimming driving part can synchronously rotate with the trimming cam so as to realize trimming. The tooth lifting and thread trimming component can conveniently and quickly control the height of the feeding teeth, can realize the linkage of tooth lifting and thread trimming operation, and can improve the production efficiency and reduce the complexity of the structure.

Description

Feed lifting thread trimming assembly and sewing machine with feed lifting thread trimming assembly

Technical Field

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

Background

As is known, a sewing machine is a machine for forming one or more stitches on a material to be sewn, by means of one or more sewing threads, to interlace or sew up one or more layers of the material, and is generally composed of four parts, a feeding device, a machine base, a transmission and accessories, which cooperate reasonably through the movements of the various parts, to operate cyclically, to sew up the material.

In the prior art, for a sewing machine, particularly a flat sewing machine, the horizontal movement direction of a feeding tooth is controlled by a feeding shaft, the vertical movement direction of the feeding tooth is controlled by a feed lifting tooth shaft, and the phase position between the horizontal direction and the vertical direction is determined by a feeding eccentric wheel, so that an elliptic track of the feeding tooth is finally formed. When the thickness of the sewing cloth changes, the height of the teeth needs to be adjusted to achieve a better sewing effect. The conventional sewing machine at present is complicated in adjusting the height of teeth and cannot be accurately controlled. When cloth is placed in the seam, the teeth are in a high position, and the cloth can be hung.

Meanwhile, for the thread trimming operation, the thread end is often longer after the thread trimming, which is not beneficial to improving the production quality.

In summary, it is a technical problem to be considered by those skilled in the art how to provide a sewing machine capable of conveniently and quickly realizing the linkage of the tooth lifting operation and the thread cutting operation.

Disclosure of Invention

The invention aims to provide a feed lifting tooth thread trimming assembly and a sewing machine with the feed lifting tooth thread trimming assembly, which can conveniently and quickly control the height of a feed feeding tooth, realize the linkage of feed lifting tooth and thread trimming operation, improve the production efficiency and reduce the complexity of the structure.

In order to achieve the purpose, the invention provides a feed lifting tooth thread trimming assembly, which comprises a driving part, a front feed lifting tooth shaft and a rear feed lifting tooth shaft, wherein the front feed lifting tooth shaft and the rear feed lifting tooth shaft are arranged in parallel;

the driving part is connected with a tooth lifting driving device and a trimming driving device, and the second end of the front tooth lifting swing plate and the second end of the rear tooth lifting swing plate are respectively connected with one end of the tooth lifting driving device in a rotating way; after the front feed lifting die is driven by the driving part, an included angle between the front feed lifting die crank and the rear feed lifting die crank is changed, so that the front feed lifting die shaft and the rear feed lifting die shaft rotate relatively to adjust the height of the feed feeding die;

the trimming driving device is connected with the trimming driving part; after being driven by the driving part, the trimming driving part can synchronously rotate with the trimming cam so as to realize trimming.

Optionally, the lifting tooth driving device includes a lifting tooth adjusting swing connecting rod, the second end of the front lifting tooth swing plate and the second end of the rear lifting tooth swing plate are respectively and rotatably connected to one end of the lifting tooth adjusting swing connecting rod, the lifting tooth adjusting swing connecting rod is connected to the driving portion through a transmission device, and when the driving portion is driven, the lifting tooth adjusting swing connecting rod swings.

Optionally, the trimming driving device comprises a ball, a swinging portion and a transmission portion, the ball is fixedly arranged on the trimming driving portion, the transmission portion is connected with the swinging portion, when the swinging portion moves for a preset angle under the action of an output shaft of the driving portion, the swinging portion triggers the transmission portion to move, and the ball abuts against the trimming cam under the action of the movement of the transmission portion so that the ball and the trimming cam rotate synchronously.

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

Optionally, the trimming driving part is fixedly arranged on the trimming driving shaft, the swinging part is specifically a rotary crank, the conducting part is specifically a special-shaped rod, the special-shaped rod comprises a trimming inclined plane and an equidistant plane which are positioned on the same plane, and the end part of the special-shaped rod is rotatably connected with the rotary crank; the trimming inclined plane and the equidistant plane can be selectively contacted with the trimming driving shaft;

when the trimming inclined plane is contacted with the trimming driving shaft, the ball is propped against the trimming cam so as to enable the ball and the trimming cam to synchronously rotate.

Optionally, the tip of dysmorphism pole is equipped with the section of bending, and the section of bending includes the mounting panel that two intervals set up, and coaxial spacing hole is seted up to two mounting panels, and the spacing groove is seted up to rotary crank's tip, and the both ends of spacer pin cooperate with two spacing holes respectively, and spacer pin and spacing groove cooperation to make dysmorphism pole and rotary crank rotate to be connected.

Optionally, the transmission device is embodied as an adjusting eccentric wheel, an output shaft of the driving part is fixedly arranged in an eccentric hole of the adjusting eccentric wheel, and the end part of the lifting tooth adjusting swing connecting rod is rotatably connected to the adjusting eccentric wheel;

the swinging part is specifically a trimming lever, the first end of the trimming lever is rotatably connected to the fixed position, and the second end of the trimming lever is in sliding fit with the adjusting eccentric wheel;

the conducting part is arranged at a position far away from the second end of the trimming lever, when the eccentric wheel is adjusted to rotate by a preset angle, the trimming lever rotates, and under the driving of the trimming lever, the conducting part pushes the trimming driving part to enable the ball and the trimming cam to be abutted.

Optionally, the trimming mechanism further comprises a trimming support, the trimming lever is rotatably connected to the trimming support, the trimming support is further provided with a return spring, the return spring is sleeved on a lever limiting pin fixed on the trimming support, and the return spring is located at an included angle between the trimming lever and the conducting part so that the trimming lever is reset to a position where the trimming driving part is not pushed; the trimming driving part is connected with the elastic part so as to reset the trimming driving part to a position which is not pushed by the conducting part.

Optionally, the front feed lifting rock crank comprises a front locking end and a front extension end, the front locking end is connected with the front extension end, the front locking end wraps around the front feed lifting rock shaft, and/or the front extension end extends along the radial outer side of the front feed lifting rock shaft;

the rear feed lifting crank comprises a rear locking end and a rear extension end, the rear locking end is connected with the rear extension end, the rear locking end wraps the rear feed lifting shaft, and the rear extension end extends along the radial outer side of the rear feed lifting shaft.

The invention also provides a sewing machine which comprises the tooth lifting thread trimming assembly.

Compared with the background technology, the tooth lifting thread trimming assembly provided by the invention utilizes the driving part to drive the tooth lifting driving device and the thread trimming driving device to move, so that the height of a feeding tooth is adjusted and thread trimming is performed; specifically, the lifting tooth thread trimming assembly replaces a lifting tooth shaft in the prior art with a front lifting tooth shaft and a rear lifting tooth shaft which are arranged in parallel, the front lifting tooth shaft is fixedly provided with a front lifting tooth crank, the rear lifting tooth shaft is fixedly provided with a rear lifting tooth crank, the front lifting tooth crank is rotatably connected with a first end of a front lifting tooth swinging plate, the rear lifting tooth crank is rotatably connected with a first end of a rear lifting tooth swinging plate, and a second end of the front lifting tooth swinging plate and a second end of the rear lifting tooth swinging plate are respectively rotatably connected with one end of a lifting tooth driving device; after the feed lifting tooth driving device is driven by the driving part to act, the included angle between the front feed lifting tooth crank and the rear feed lifting tooth crank is changed, namely the front feed lifting tooth shaft and the rear feed lifting tooth shaft rotate relatively, and the phase angle between the front feed lifting tooth shaft and the rear feed lifting tooth shaft is changed, so that the purpose of adjusting the height of the feed lifting tooth is achieved. In short, this application sets up the feed lifting teeth axle into split type, and preceding feed lifting teeth axle and back feed lifting teeth axle two parallel arrangement also can coaxial setting, and preceding feed lifting teeth axle can be adjusted according to the sewing operating mode with the phase place of back feed lifting teeth axle to the height of control pay-off tooth. It can be seen that according to actual needs, the height of the feeding teeth can be lowered below the needle plate when cloth is placed, and cloth hanging of the feeding teeth is avoided. Meanwhile, after the thread trimming driving device is driven by the driving part to act, the synchronous rotation of the thread trimming driving part and the thread trimming cam can be realized, and then the thread trimming operation is completed. By the arrangement, the height of the feeding teeth can be adjusted and the thread trimming action can be completed by using the single power source of the driving part, so that the production efficiency is improved, and the structural complexity is reduced.

The sewing machine provided by the invention has the beneficial effects, and the details are not repeated herein.

Drawings

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

FIG. 1 is a front view of a sewing machine having a feed lifting thread trimming assembly according to an embodiment of the present invention;

FIG. 2 is a bottom view of a sewing machine having a feed lifting assembly in accordance with an embodiment of the present invention;

FIG. 3 is a block diagram of a tooth lifting driving device of a first tooth lifting thread trimming assembly according to an embodiment of the present invention;

FIG. 4 is an exploded view of a first tooth lifting drive mechanism of a tooth lifting wire cutting assembly according to an embodiment of the present invention;

FIG. 5 is a partial exploded view of FIG. 4;

FIG. 6 is a view of the structure of the rocker of FIG. 5;

fig. 7 is a schematic view of a tooth lifting driving device of a first tooth lifting thread trimming assembly provided by an embodiment of the invention when a feeding tooth is at the highest point;

FIG. 8 is a schematic view of a tooth lifting driving device of a first tooth lifting thread trimming assembly provided by an embodiment of the invention when a feed tooth is at the lowest point;

fig. 9 is a schematic view of a thread trimming driving device of a first tooth lifting thread trimming assembly provided by an embodiment of the invention when a feeding tooth is at the lowest point;

fig. 10 is a schematic structural view of the shaped bar of fig. 9;

fig. 11 is a functional section diagram of a driving part of a first tooth lifting thread trimming assembly provided by an embodiment of the invention in a rotating process;

FIGS. 12-14 are schematic views of a first tooth lifting wire cutting assembly according to an embodiment of the present invention in different functional states;

FIG. 15 is a schematic view of a second tooth lifting thread trimming assembly according to an embodiment of the present invention;

FIG. 16 is an exploded view of a second tooth lifting drive mechanism of a tooth lifting wire cutting assembly in accordance with an embodiment of the present invention;

FIG. 17 is an exploded view of a wire cutting drive assembly of a second tooth lifting wire cutting assembly in accordance with an embodiment of the present invention;

FIG. 18 is a partial exploded view of FIG. 17;

FIG. 19 is a functional block diagram of a driving part of a second tooth lifting thread trimming assembly according to an embodiment of the present invention during rotation;

fig. 20-22 are schematic views of a second tooth lifting thread trimming assembly provided in accordance with an embodiment of the present invention in different functional states.

Wherein:

an upper shaft 1, a driving part 2, a feeding component 3, a feed lifting shaft component 4, a trimming component 5, a trimming driving device 501, a feeding shaft 6, a feed lifting fork type crank 7, a feeding eccentric wheel 8, a feed lifting connecting rod 9, a feeding connecting rod 10, a lifting tooth rear crank 11, a front lifting tooth shaft 12, a front lifting tooth shaft sleeve 13, a front lifting tooth crank 14, a lifting tooth adjusting pin 15, a rear lifting tooth crank 16, a rear lifting tooth shaft sleeve 17, a rear lifting tooth shaft 18, a front lifting tooth crank pin 19, a front lifting tooth swinging plate 20, a rear lifting tooth swinging plate 21, a rear lifting tooth crank pin 22, a lifting tooth adjusting swinging connecting rod 24, a swinging connecting rod pin 25, a rocker 26, a first connecting hole 261, a second connecting hole 262, a third connecting hole 263, a connecting rod pin 27, a shaft position connecting piece 28, a driving connecting rod 29, a driving crank 30, a bracket 31, a feed lifting tooth 32, a needle plate 33, an adjusting eccentric wheel 301, a feed lifting tooth,

A rotary crank 001, a special-shaped rod 002, a limit pin 003, a trimming inclined plane 0021, an equidistant plane 0022, a mounting plate 0023, a limit hole 0024, a limit groove 0011,

The thread trimming device comprises a thread trimming driving shaft 01, a thread trimming cam 05, an elastic part 06, a thread trimming driving part 07, a thread trimming driving abutting surface 08, a pushing end 09, a ball 022, a return spring 023, a thread trimming lever 024, a rolling part 025, a lever limiting pin 026, a lever shaft position screw 027 and a thread trimming bracket 028.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The first embodiment is as follows:

the tooth lifting thread trimming assembly provided by the embodiment of the invention, as shown in the accompanying drawings 1 to 14 in the specification, comprises a driving part 2, a front tooth lifting shaft 12 and a rear tooth lifting shaft 18, wherein the driving part 2 is connected with a tooth lifting driving device and a thread trimming driving device 501.

The front feed lifting tooth shaft 12 and the rear feed lifting tooth shaft 18 are arranged in parallel, one end of the feed shaft 6 is fixedly connected with the feed assembly 3, and the other end of the feed shaft 6 is fixedly connected with the feed swing plate seat assembly. The feeding assembly 3 is used for completing the motion track control of the feeding tooth 32, the feed lifting tooth shaft assembly 4 is used for completing the phase adjustment of the feed lifting tooth, and the feed swinging plate base assembly is used for completing the phase change of the feed.

As known in the prior art, the feeding eccentric wheel 8 is fixed on the upper shaft 1, one end of the feed lifting tooth connecting rod 9 is rotatably connected to the feeding eccentric wheel 8, and the other end of the feed lifting tooth connecting rod 9 is rotatably connected to the feed lifting tooth rear crank 11. One end of a feeding connecting rod 10 is rotatably connected to the feeding eccentric wheel 8, and the other end of the feeding connecting rod 10 is rotatably connected to the feeding swing plate seat assembly; of course, the feed cam 8 and the feed connecting rod 9 are each rotatably connected to a different position of the feed eccentric 8.

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

In the present application, the second end of the front swing plate 20 and the second end of the rear swing plate 21 are respectively connected to one end of the lifting tooth driving device in a rotating manner, that is, the front swing plate 20 and the rear swing plate 21 are connected by the lifting tooth driving device, and it is obviously conceivable that the front lifting tooth shaft 12 and the rear lifting tooth shaft 18 are connected by the lifting tooth driving device.

Through the driving of the driving part 2, the feed dog driving device acts, so that the included angle between the front feed dog crank 14 and the rear feed dog crank 16 is changed, namely the front feed dog shaft 12 and the rear feed dog shaft 18 rotate relatively, the phase angle between the front feed dog crank and the rear feed dog shaft is changed, and the height of the feed dog 32 is adjusted, as shown in the attached figures 7 and 8 in the specification.

Meanwhile, the driving part 2 drives the trimming driving device to act, so that the trimming driving part 07 can rotate synchronously with the trimming cam 05 to realize trimming. Consistent with the prior art, the trimming cam 05 is fixedly arranged on the lower shaft, the trimming driving part 07 is fixedly arranged on the trimming driving shaft 01, the lower shaft drives the trimming cam 05 to rotate, when the trimming driving part 07 and the trimming cam 05 synchronously rotate, the trimming driving shaft 01 rotates, and the trimming assembly 5 can complete trimming operation.

For the driving part 2, power such as a stepping motor, a piston cylinder, a servo motor and the like can be adopted to provide power with the case, and the power can be transmitted through a transmission mechanism such as a synchronous belt, gear transmission, a worm gear and the like.

Referring to the description and the accompanying drawings of fig. 4 to 8, the driving part 2 may include a feed lifting adjusting swing link 24, the feed lifting adjusting swing link 24 and the driving part 2 may be connected through a synchronous belt, a gear transmission, a worm gear and the like to transmit power, and the front feed lifting crank 14 and the rear feed lifting crank 16 are respectively located at two sides of one end of the feed lifting adjusting swing link 24.

The front feed lifting rock crank 14 may be fixed to the end of the front feed lifting rock shaft 12 and the rear feed lifting rock crank 16 may be fixed to the end of the rear feed lifting rock shaft 18, and in this embodiment, the front feed lifting rock crank 14 and the rear feed lifting rock crank 16 are preferably disposed adjacent to each other, that is, the front feed lifting rock crank 14 and the rear feed lifting rock crank 16 are respectively disposed on both sides of one end of the feed lifting rock adjusting swing link 24.

When the feed dog adjusting swing connecting rod 24 moves under the action of the driving part 2, the feed dog adjusting swing connecting rod simultaneously drives the front feed dog swing plate 20 and the rear feed dog swing plate 21 to move, further drives the front feed dog crank 14 and the rear feed dog crank 16, adjusts the included angle between the front feed dog crank 14 and the rear feed dog crank 16, changes the phase angle between the front feed dog shaft 12 and the rear feed dog shaft 18, and accordingly adjusts the height of the feed dog 32. The transmission device comprises a rocker 26, a driving connecting rod 29 and a driving crank 30, wherein a first position of the driving crank 30 is fixedly connected with an output shaft of the driving part 2, and when the driving part 2 moves, the output shaft rotates to drive 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 connecting rod 29, the second end of the driving connecting rod 29 is rotatably connected to the first position of the rocking rod 26, the second position of the rocking rod 26 is rotatably connected to the tooth lifting adjusting swing connecting rod 24, and the third position of the rocking rod 26 is rotatably connected to the fixed end.

Obviously, when the output shaft of the driving part 2 rotates, the driving crank 30 rotates and swings, which drives the driving connecting rod 29 to swing and further drives the rocker 26 to swing, and finally realizes the motion of the feed lifting adjusting swing connecting rod 24 and adjusts the included angle between the front feed lifting crank 14 and the rear feed lifting crank 16.

The first position of rocker 26 and the third position of rocker 26 are located at opposite ends of rocker 26, respectively, and the second position of rocker 26 is located between the first position of rocker 26 and the third position of rocker 26.

As shown in fig. 6, the first connection hole 261 is used for inserting the link pin 27, the link pin 27 rotatably connects the rocking bar 26 and the driving link 29, the second connection hole 262 is used for inserting the rocking link pin 25, the rocking link pin 25 rotatably connects the rocking bar 26 and the tooth lifting adjusting rocking link 24, the third connection hole 263 is used for inserting the shaft connecting member 28, and the shaft connecting member 28 rotatably connects the rocking bar 26 to the fixed end.

Referring to fig. 5 of the drawings, the driving part 2 is mounted on a bracket 31, the bracket 31 is provided with a mounting hole, and the shaft connecting piece 28 is matched with the mounting hole to rotatably connect the rocker 26 to the bracket 31.

The front feed lifting rock shaft crank 14 comprises a front locking end and a front extension end, the front locking end is connected with the front extension end, the front locking end is wrapped on the front feed lifting rock shaft 12, the front extension end extends along the radial outer side of the front feed lifting rock shaft 12, the front feed lifting rock shaft 12 can be further provided with a front feed lifting rock shaft sleeve 13, and the front feed lifting rock shaft sleeve 13 can be arranged on a bottom plate of the sewing machine.

The front feed lifting rock crank 14 can be integrally arranged and bent to form a front locking end and a front extension end, the front locking end and the front feed lifting rock shaft 12 can be locked through screws and the like, and the front extension end is rotatably connected with the front feed lifting rock swinging plate 20. The front extension end and the end of the front feed dog oscillating plate 20 are obviously provided with a rotating shaft hole, so that the front feed dog crank pin 19 penetrates through the rotating shaft hole to realize the rotating connection between the front feed dog crank 14 and the front feed dog oscillating plate 20.

Similar to the front feed dog crank 14, the rear feed dog crank 16 includes a rear locking end connected to a rear extension end that wraps around the rear feed dog shaft 18 and extends radially outward of the rear feed dog shaft 18. The rear feed lifting handle shaft 18 can also be provided with a rear feed lifting handle shaft sleeve 17, and the rear feed lifting handle shaft sleeve 17 can be arranged on a bottom plate of the sewing machine. The rear feed lifting rock shaft crank 16 can be integrally arranged and bent to form a rear locking end and a rear extension end, the rear locking end and the rear feed lifting rock shaft 18 can be locked through screws and the like, and the rear extension end is rotatably connected with the rear feed lifting rock swinging plate 21.

Obviously, the rear extension end and the end of the rear feed dog swing plate 21 should also be provided with a rotating shaft hole, so that the rear feed dog crank pin 22 penetrates through the rotating shaft hole to realize the rotating connection between the rear feed dog crank 16 and the rear feed dog swing plate 21.

On the basis, a front through groove can be formed in the front extending end of the front feed lifting rock crank 14, the front through groove extends along the radial direction of the front feed lifting rock shaft 12, one end of the front feed lifting rock swinging plate 20 extends into the front through groove, the front feed lifting rock crank pin 19 extends along the axial direction of the front feed lifting rock shaft 12 and penetrates through the front through groove, and the front feed lifting rock swinging plate 20 is rotatably connected with the front extending end of the front feed lifting rock crank 14.

The other end of the front lifting tooth swinging plate 20 and the lifting tooth adjusting swinging connecting rod 24 can be rotatably connected through a lifting tooth adjusting pin 15. The rear extension end of the rear feed lifting crank 16 can be provided with a rear through groove, the rear through groove extends along the radial direction of the rear feed lifting shaft 18, one end of the rear feed lifting swing plate 21 extends into the rear through groove, the rear feed lifting crank pin 22 extends axially along the rear feed lifting shaft 18 and penetrates through the rear through groove, and the rear feed lifting swing plate 21 is rotatably connected with the rear extension end of the rear feed lifting crank 16. The other end of the rear lifting tooth swinging plate 21 and the lifting tooth adjusting swinging connecting rod 24 can be rotatably connected through a lifting tooth adjusting pin 15.

It can be seen that the front feed dog crank 14, front feed dog crank pin 19 and front feed dog wobble plate 20 are arranged in a similar manner to the rear feed dog crank 16, rear feed dog wobble plate 21 and rear feed dog crank pin 22.

In this embodiment, it is preferable that the front feed lifting rock shaft 12 and the rear feed lifting rock shaft 18 are coaxially arranged, and the front feed lifting rock crank 14 and the rear feed lifting rock crank 16 have the same shape and size and are distributed in a herringbone shape on the projection along the axial direction of the front feed lifting rock shaft 12.

In a normal sewing state, the driving part 2 is electrically locked, and the rocker 26 is fixed at a position at the moment, which is exemplified by the feeding tooth 32 being at the highest point, and the mechanism state is shown in fig. 7. In this state, the front feed dog oscillating plate 20 and the rear feed dog oscillating plate 21 are aligned on a straight line, and the angle between the front feed dog crank 14 and the rear feed dog crank 16 is the largest.

When the upper shaft 1 drives the feeding eccentric wheel 8 to rotate, the feed lifting tooth rear crank 11 is driven to swing through the feed lifting tooth connecting rod 9, the swinging action of the feed lifting tooth rear crank 11 is transmitted to the drive rear feed lifting tooth crank 16 through the rear feed lifting tooth shaft 18, so that the rear feed lifting tooth crank 16 swings, the front feed lifting tooth crank 14 is driven to swing with the same swing amplitude through the front feed lifting tooth swinging plate 20, the rear feed lifting tooth swinging plate 21 and the feed lifting tooth adjusting swinging connecting rod 24, and the front feed lifting tooth crank 14 drives the feed lifting tooth fork type crank 7 to swing through the front feed lifting tooth shaft 12, so that the feeding tooth can reciprocate in the vertical direction.

The power of the feeding eccentric wheel 8 finally drives the feeding tooth 32 to reciprocate in the horizontal direction through the feeding connecting rod 10, the feeding swing plate seat component and the feeding shaft 6, and finally the sewing motion track of the feeding tooth 32 is realized.

When the presser foot is lifted to place sewing cloth before sewing is started, the driving part 2 rotates clockwise, and the mechanism is in a state that the feeding tooth is at the lowest point, as shown in the attached figure 8 of the specification. In this state, the feed dog 32 is located below the needle plate 33, and the situation that the teeth hang the cloth does not occur in the cloth placing process. When the sewing working condition changes and the height of the feeding tooth 32 needs to be adjusted, the driving crank 30 rotates clockwise and can stop in the included angle range corresponding to the accompanying drawings of fig. 8 and 7, when the driving crank 30 stops at different positions, the phase included angles between the front feed lifting crank 14 and the rear feed lifting crank 16 are different (compare the accompanying drawings of fig. 7 and 8), the larger the phase angle is, the higher the height of the corresponding feeding tooth 32 is, and the smaller the phase angle is, the lower the height of the corresponding feeding tooth 32 is, so that the height adjustment of the feeding tooth 32 is realized.

Another important improvement part of this application is trimming drive 501, and trimming drive 501 can include ball 022, swinging part and conduction portion, and ball 022 sets firmly in trimming drive 07, and the conduction portion links to each other with the swinging part, and when drive portion 2 drives, then the swinging part can take place the motion. When the swinging part moves for a preset angle under the action of the output shaft of the driving part 2, the swinging part triggers the transmission part to move, the transmission part acts on the ball 022, and the ball 022 offsets with the trimming cam 05, so that the ball 022 and the trimming cam 05 synchronously rotate.

Trimming drive shaft 01 and the common parallel arrangement of lower shaft, under initial condition, can set up certain axial interval between ball 022 and trimming cam 05 between the two, when the output shaft of drive division 2 is rotatory, then can drive the swing portion and take place the swing, utilize the swing portion to trigger the motion of conduction portion, conduction portion transmits effort to ball 022 for ball 022 is along axial motion, for offset with trimming cam 05, realize ball 022 and trimming cam 05 synchronous revolution.

It can be seen that the main function of both the transmission part and the swing part is to convert the rotary motion of the output shaft of the driving part 2 into axial motion, and the specific arrangement mode of both the transmission part and the swing part can be various, and only a limited number of preferred specific embodiments are given herein.

As shown in the accompanying

drawings

2, 9 to 14 of the specification, the swinging part is specifically a rotary crank 001, the conduction part is specifically a special-shaped rod 002, the special-shaped rod 002 comprises a trimming inclined plane 0021 and an equidistant plane 0022 which are positioned on the same plane, and the end part of the special-shaped rod 002 is rotatably connected with the rotary crank 001; both the shear slope 0021 and the equidistant surface 0022 are selectively in contact with the shear drive shaft 01.

Under the normal sewing state, the equidistant surface 0022 is contacted with the thread cutting driving shaft 01, the ball 022 is not contacted with the thread cutting cam 05 at the moment, and the position relation of the feeding tooth 32 and the needle plate surface is shown in the attached figure 13 of the specification.

When the trimming operation is needed, the trimming inclined plane 0021 is in contact with the trimming driving shaft 01, and the trimming driving shaft 01 moves along the axial direction at the moment to drive the trimming driving part 07 and the ball 022 to move along the axial direction, so that the ball 022 is abutted to the trimming cam 05, and the ball 022 and the trimming cam 05 rotate synchronously.

Like description attached drawing 9 and 10, the tip of special-shaped pole 002 is equipped with the section of bending, and the section of bending includes the mounting panel 0023 that two intervals set up, and coaxial spacing hole 0024 is seted up to two mounting panels 0023, and spacing groove 0011 is seted up to the tip of rotary crank 001, and the both ends of spacer pin 003 cooperate with two spacing holes 0024 respectively, and spacer pin 003 and spacing groove 0011 cooperation to make special-shaped pole 002 and rotary crank 001 rotate and connect.

When a main controller of the sewing machine receives a thread cutting signal, an output shaft of the driving part 2 rotates anticlockwise (taking the direction shown in the attached drawing 11 of the specification as an example), the rotary crank 001 rotates anticlockwise, a limiting groove 0011 of the rotary crank 001 drives the limiting pin 003 and the special-shaped rod 002 to move towards the right, the thread cutting inclined plane 0021 props against the end part of the thread cutting driving shaft 01, the thread cutting driving shaft is driven to move leftwards (shown in the attached drawing 14 of the specification), the thread cutting driving part 07 and the ball 022 are driven to move leftwards, the ball 022 abuts against the thread cutting cam 05, and the thread cutting cam 05 drives the thread cutting assembly 5 to complete thread cutting after rotating.

After trimming is completed, the output shaft of the driving part 2 rotates clockwise to drive the special-shaped rod 002 to move leftwards, the trimming driving shaft 01 resets and enters the equidistant surface 0022, the end part of the trimming driving shaft 01 cannot be in contact with the trimming inclined surface 0021 (shown in the attached drawing 12 and the attached drawing 13 in the specification) in the tooth height adjusting interval and the lower supply interval, namely tooth lifting and lower supply actions cannot influence trimming, and finally two functions of tooth lifting and trimming driven by the driving part 2 are achieved.

Example two:

different from the previous embodiment, the driving part 2 can directly realize the change of the included angle between the front feed lifting rock shaft crank 14 and the rear feed lifting rock shaft crank 16 by adjusting the eccentric wheel 301; specifically, the output shaft of the driving part 2 is fixedly arranged in an eccentric hole of the adjusting eccentric wheel 301, and the end part of the lifting tooth adjusting swing connecting rod 24 is fixedly arranged on the side edge of the adjusting eccentric wheel 301.

When the driving part 2 moves, the output shaft of the driving part 2 rotates to drive the adjusting eccentric wheel 301 to rotate, and since the eccentric hole of the adjusting eccentric wheel 301 is fixedly connected with the output shaft of the driving part 2, when the adjusting eccentric wheel 301 rotates, the side edge of the adjusting eccentric wheel 301 does not rotate around the fixed shaft, but swings, so that the tooth lifting adjusting swing connecting rod 24 swings, thereby changing the included angle between the front tooth lifting crank 14 and the rear tooth lifting crank 16, so that the front tooth lifting shaft 12 and the rear tooth lifting shaft 18 rotate relatively, as shown in fig. 15 and 16 in the specification.

Besides, the front extending end of the front feed dog crank 14 may not be provided with a front through groove, the front feed dog oscillating plate 20 is located at one side of the front extending end of the front feed dog crank 14, and the front feed dog crank 14 and the front feed dog oscillating plate 20 can be rotationally connected by using the front feed dog crank pin 19, as shown in fig. 15 and 16 in the specification.

Similarly, the rotational connection between the rear feed dog crank 16 and the rear feed dog swing plate 21 can refer to the above-mentioned different forms, and will not be described in detail herein.

Regarding the specific arrangement of the trimming driving device 501, as shown in fig. 17 and 18 in the specification, since the adjusting eccentric 301 is adopted in the second embodiment instead of the link mechanism in the first embodiment, the trimming driving device 501 should be modified accordingly.

The swinging part is specifically a trimming lever 024, a first end of the trimming lever 024 is rotatably connected to a fixed position, and a second end of the trimming lever 024 is in sliding fit with the adjusting eccentric wheel 301; the conduction portion is arranged at a position far away from the second end of the trimming lever 024, when the eccentric wheel 301 is adjusted to rotate by a preset angle, the trimming lever 024 rotates, and the conduction portion pushes the trimming driving portion 07 under the driving of the trimming lever 024, so that the ball 022 is abutted to the trimming cam 05.

A first end of the thread trimming lever 024 is rotatably connected to the bracket 31, and a second end of the thread trimming lever 024 may be provided with a rolling portion 025, and the rolling portion 025 is configured to be in rolling engagement with a side edge of the adjusting eccentric 301.

The conduction portion can be specifically for being the promotion end 09 that bends, promotion end 09 and trimming lever 024 both can be integrated into one piece, are V style of calligraphy on the whole, and the tip of promotion end 09 is used for leaning on with the trimming drive that is located trimming drive portion 07 tip and leans on face 08, and the side edge that the trimming drive leaned on face 08 sets up ball 022. The trimming driving part 07, the trimming driving abutting surface 08 and the ball 022 may be integrally formed.

The end surface of the trimming drive abutting surface 08 is larger than the cross section of the trimming drive part 07 to increase the contact area of the pushing end 09, and the trimming drive abutting surface 08 is located in the radial direction of the trimming drive shaft 01.

Under the normal sewing state, the output shaft of the driving part 2 is positioned in the tooth height adjusting region shown in the attached figure 19 of the specification, and the height of the feeding tooth 32 can be controlled by the parameters of the main controller of the sewing machine; when the tooth height needs to be increased, the output shaft of the driving part 2 rotates clockwise, and the adjusting eccentric wheel 301 drives the lifting tooth adjusting swing connecting rod 24 to move.

Taking the example that the feed dog is adjusted from the lower position to the highest position, the quadrilateral shape formed by the front feed dog crank 14, the front feed dog swinging plate 20, the rear feed dog swinging plate 21 and the rear feed dog crank 16 is changed, the included angle formed by the front feed dog crank 14 and the rear feed dog crank 16 is in the maximum state, as shown in the attached drawing 21 in the specification, at this time, the phase angle between the front feed dog shaft 12 and the rear feed dog shaft 18 is maximum, and after the motion state is transmitted through the feed assembly 3, the feed dog 32 can reach the highest position, as shown in the attached drawing 21 in the specification.

When the presser foot lifting action is started, the output shaft of the driving part 2 is positioned in a tooth height (height of the feeding tooth 32) rapid descending interval shown in the specification attached figure 19, the output shaft of the driving part 2 rotates clockwise, the adjusting eccentric wheel 301 drives the lifting tooth adjusting swing connecting rod 24 to move, an included angle formed by the front lifting tooth crank 14 and the rear lifting tooth crank 16 is rapidly reduced, as shown in the specification attached figure 20, the phase angle between the front lifting tooth shaft 12 and the rear lifting tooth shaft 18 is minimum, after the motion state is transmitted through the feeding assembly 3, the feeding tooth 32 is positioned below a needle plate surface, as shown in the specification attached figure 20, the sewing cloth can be replaced or moved, and the defect that the feeding tooth 32 hangs cloth is avoided.

When a thread cutting action is required, the output shaft of the driving part 2 rotates anticlockwise, the output shaft rotates from the tooth height adjusting interval to the thread cutting interval, the adjusting eccentric wheel 301 drives the tooth lifting adjusting swing connecting rod 24 to move, the quadrilateral shape formed by the front tooth lifting crank 14, the front tooth lifting swing plate 20, the rear tooth lifting swing plate 21 and the rear tooth lifting crank 16 changes, the included angle formed by the front tooth lifting crank 14 and the rear tooth lifting crank 16 is firstly increased to the state shown in the attached drawing 21 of the specification and then changed to the state shown in the attached drawing 22 of the specification, and the height of the feed tooth 32 is reduced to be close to the plane of the needle plate. After the included angle between the front feed lifting crank 14 and the rear feed lifting crank 16 passes through a maximum angle, the eccentric wheel 301 is adjusted to drive the rolling portion 025, the rolling portion 025 drives the thread trimming lever 024 to rotate anticlockwise around the lever shaft position screw 027, after the thread trimming lever 024 is contacted with the thread trimming driving abutting surface 08, the thread trimming driving portion 07 moves left along the axial direction of the thread trimming driving shaft 01, at the moment, the ball 022 drives the thread trimming driving portion 07 to rotate under the driving of the thread trimming cam 05, and finally the thread trimming assembly 5 is driven to complete thread trimming.

Referring to the specification, fig. 17 and 18, the tooth lifting thread trimming assembly further includes a thread trimming bracket 028, the thread trimming bracket 028 can be fixed on the bracket 31, the thread trimming lever 024 is rotatably connected to the thread trimming bracket 028, the return spring 023 is sleeved on a lever limit pin 026 fixed on the thread trimming bracket 028, and the return spring 023 is located at a included angle between the thread trimming lever 024 and the conducting part, so that the thread trimming lever 024 is reset to a position where the thread trimming driving part 07 is not pushed; the thread cutting driving portion 07 and the elastic portion 06 are connected to return the thread cutting driving portion 07 to a position not pushed by the thread cutting lever 024.

Taking the orientation shown in fig. 18 in the specification as an example, the upper surface of the trimming support 028 is provided with a first hole on the left side and a second hole on the right side, the trimming lever 024 is provided with a first through hole and a second through hole, and the lever shaft position screw 027 sequentially penetrates through the first through hole of the trimming lever 024 and the first hole of the trimming support 028 from top to bottom, so that the trimming lever 024 can rotate around the lever shaft position screw 027. The rolling part 025 is rotatably connected to the second through hole of the thread trimming lever 024, and the rolling part 025 can rotate relative to the thread trimming lever 024 to reduce the abrasion of the rolling part 025. The second hole of the trimming support 028 is fixedly connected with the lever limit pin 026, and the reset spring 023 can be set to be a torsion spring and other parts.

Elastic part 06 and the face 08 that supports that the trimming drives are located the both ends of trimming drive part 07 respectively, when the push end 09 promotes trimming drive part 07 along the axial displacement of trimming drive shaft 01, elastic part 06 is compressed, the left end of elastic part 06 can support on fixed position, when trimming drive part 07 does not receive the impetus of push end 09, then the elastic force release of elastic part 06, with trimming drive part 07, the trimming drives supports to support on face 08 and ball 022 three resets to the position that is not promoted by push end 09.

Continuing with the above-described operation process as an example, when the trimming operation is performed, the feeding tooth 32 is in a lower state, which can further reduce the length of the trimming thread end, after the trimming operation is completed, the output shaft of the driving part 2 rotates clockwise to enter the tooth height adjusting region, and is reset under the action of the elastic part 06, and the trimming lever 024 is reset under the action of the reset spring 023 and abuts against the lever limit pin 026.

Example three:

the invention provides a sewing machine with a tooth lifting thread trimming assembly, which comprises the tooth lifting thread trimming assembly described in the first embodiment and the second embodiment; other parts of the sewing machine can be referred to the prior art and are not expanded herein.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The above detailed description is provided for the feed lifting thread trimming assembly and the sewing machine having the feed lifting thread trimming assembly provided by the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The tooth lifting thread trimming assembly comprises a driving part (2) and is characterized by further comprising a front tooth lifting shaft (12) and a rear tooth lifting shaft (18) which are arranged in parallel, wherein a front tooth lifting crank (14) is fixedly arranged on the front tooth lifting shaft (12), a rear tooth lifting crank (16) is fixedly arranged on the rear tooth lifting shaft (18), the front tooth lifting crank (14) is rotatably connected with a first end of a front tooth lifting swing plate (20), and the rear tooth lifting crank (16) is rotatably connected with a first end of a rear tooth lifting swing plate (21);

the driving part (2) is connected with a lifting tooth driving device and a trimming wire driving device, and the second end of the front lifting tooth swinging plate (20) and the second end of the rear lifting tooth swinging plate (21) are respectively connected with one end of the lifting tooth driving device in a rotating way; after being driven by the driving part (2), an included angle between the front feed lifting rock shaft crank (14) and the rear feed lifting rock shaft crank (16) is changed, so that the front feed lifting rock shaft (12) and the rear feed lifting rock shaft (18) rotate relatively to adjust the height of the feed lifting rock;

the trimming driving device is connected with the trimming driving part (07); after the driving part (2) drives, the trimming driving part (07) can synchronously rotate with the trimming cam (05) to realize trimming.

2. The tooth lifting thread trimming assembly according to claim 1, wherein the tooth lifting driving device comprises a tooth lifting adjusting swing connecting rod (24), the second end of the front tooth lifting swing plate (20) and the second end of the rear tooth lifting swing plate (21) are both rotatably connected to one end of the tooth lifting adjusting swing connecting rod (24), the tooth lifting adjusting swing connecting rod (24) is connected with the driving part (2) through a transmission device, and the tooth lifting adjusting swing connecting rod (24) swings when the driving part (2) is driven.

3. The tooth lifting wire cutting assembly according to claim 2, characterized in that the wire cutting driving device comprises a ball (022), a swinging portion and a conduction portion, the ball (022) is fixedly arranged on the wire cutting driving portion (07), the conduction portion is connected with the swinging portion, when the swinging portion moves for a preset angle under the action of an output shaft of the driving portion (2), the swinging portion triggers the conduction portion to move, and the ball (022) abuts against the wire cutting cam (05) under the action of the conduction portion so as to enable the ball (022) and the wire cutting cam (05) to rotate synchronously.

4. The tooth lifting thread cutting assembly according to claim 3, wherein the transmission device comprises a rocker (26), a driving connecting rod (29) and a driving crank (30), a first position of the driving crank (30) is fixedly connected with an output shaft of the driving part (2), a second position of the driving crank (30) is rotatably connected with a first end of the driving connecting rod (29), a second end of the driving connecting rod (29) is rotatably connected with a first position of the rocker (26), a second position of the rocker (26) is rotatably connected with the tooth lifting adjusting swing connecting rod (24), and a third position of the rocker (26) is rotatably connected with a fixed end.

5. The tooth lifting thread trimming assembly according to claim 4, wherein the thread trimming driving part (07) is fixedly arranged on a thread trimming driving shaft (01), the swinging part is specifically a rotating crank (001), the conducting part is specifically a profiled rod (002), the profiled rod (002) comprises a thread trimming inclined plane (0021) and an equidistant plane (0022) which are positioned on the same plane, and the end part of the profiled rod (002) is rotatably connected with the rotating crank (001); both the shear slope (0021) and the equidistant surface (0022) are selectively in contact with the shear drive shaft (01);

when the trimming inclined plane (0021) is contacted with the trimming driving shaft (01), the ball (022) is abutted against the trimming cam (05), so that the ball (022) and the trimming cam (05) synchronously rotate.

6. The tooth lifting thread trimming assembly according to claim 5, wherein the end of the special-shaped rod (002) is provided with a bending section, the bending section comprises two mounting plates (0023) which are arranged at intervals, the two mounting plates (0023) are provided with coaxial limiting holes (0024), the end of the rotating crank (001) is provided with a limiting groove (0011), two ends of a limiting pin (003) are respectively matched with the two limiting holes (0024), and the limiting pin (003) is matched with the limiting groove (0011) so as to rotatably connect the special-shaped rod (002) and the rotating crank (001).

7. The tooth lifting thread cutting assembly according to claim 3, characterized in that the transmission device is embodied as an adjusting eccentric (301), an output shaft of the driving part (2) is fixedly arranged in an eccentric hole of the adjusting eccentric (301), and an end of the tooth lifting adjusting swing connecting rod (24) is rotatably connected to the adjusting eccentric (301);

the swing part is specifically a trimming lever (024), a first end of the trimming lever (024) is rotatably connected to a fixed position, and a second end of the trimming lever (024) is in sliding fit with the adjusting eccentric wheel (301);

the conduction portion is arranged on the position far away from the second end of the trimming lever (024), when the adjusting eccentric wheel (301) rotates for a preset angle, the trimming lever (024) rotates, and under the driving of the trimming lever (024), the conduction portion pushes the trimming driving portion (07) so that the ball (022) and the trimming cam (05) are abutted.

8. The tooth lifting thread trimming assembly according to claim 7, further comprising a thread trimming bracket (028), wherein the thread trimming lever (024) is rotatably connected with the thread trimming bracket (028), the thread trimming bracket (028) is provided with a lever limiting pin (026), the lever limiting pin (026) is sleeved with a return spring (023), and the return spring (023) is positioned at a included angle between the thread trimming lever (024) and the conducting part so as to enable the thread trimming lever (024) to be returned to a position of not pushing the thread trimming driving part (07); the trimming driving part (07) is connected with the elastic part (06) so that the trimming driving part (07) is reset to a position where the trimming driving part is not pushed by the conduction part.

9. The feed lifting mechanism according to any one of claims 1 to 8, wherein the front feed lifting crank (14) comprises a front locking end and a front extension end, the front locking end is connected with the front extension end, the front locking end is wrapped around the front feed lifting shaft (12), and the front extension end extends along the radial outer side of the front feed lifting shaft (12) and/or;

the rear feed lifting crank (16) comprises a rear locking end and a rear extension end, the rear locking end is connected with the rear extension end, the rear locking end is wrapped around the rear feed lifting shaft (18), and the rear extension end extends along the radial outer side of the rear feed lifting shaft (18).

10. A sewing machine comprising the feed lifting thread trimming assembly of any one of claims 1 to 9.