CN210856587U

CN210856587U - Thread trimming device of sewing machine

Info

Publication number: CN210856587U
Application number: CN201921926452.7U
Authority: CN
Inventors: 孙君
Original assignee: SUZHOU RIHE SEWING EQUIPMENT CO Ltd
Current assignee: SUZHOU RIHE SEWING EQUIPMENT CO Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-06-26
Anticipated expiration: 2029-11-08

Abstract

The utility model relates to a sewing machine thread trimming device, be in including limit seat, fixed setting fixed knife seat, setting on the limit seat are in stationary knife and rotation setting on the fixed knife seat are in on the limit seat can with the stationary knife cooperation realizes the sword that moves of trimming, the stationary knife through first fastener with the fixed knife seat is connected, the stationary knife still through the eccentric pin with the fixed knife seat is connected, the eccentric pin rotates to insert and establishes on the fixed knife seat, the stationary knife cover is established on the eccentric part of eccentric pin, the thread trimming device still including be used for with the eccentric pin with the second fastener of fixed knife seat relatively fixed. The utility model discloses sewing machine thread trimming device is when the assembly stationary knife, fixes a position the stationary knife position with first fastener earlier, rethread eccentric pin regulation stationary knife and move the goodness of fit between the sword, make the light cutting of end of a thread.

Description

Thread trimming device of sewing machine

Technical Field

The utility model relates to a sewing machine, concretely relates to sewing machine trimming device.

Background

A fixed knife in a traditional thread trimming device of a sewing machine is fixed on a fixed knife seat through two bolts, the fixed knife seat is fixedly connected on a base, and a movable knife is rotatably arranged on the base and driven by a driving mechanism to rotate in a reciprocating manner so as to realize the thread trimming function matched between the movable knife and the fixed knife. A sewing machine with a thread cutting device as disclosed in the patent application (application No. 200810005774.8), comprising a movable knife having a thread hooking part at a front end part and performing reciprocating driving movement along a horizontal plane to make the thread hooking part cross across a needle plate to form a needle drop hole; and a fixed knife for transferring the needle thread on the hook part to the side of the needle falling hole of the needle plate by utilizing the shearing action between the fixed knife and the movable knife when the movable knife is driven to move forwards. The friction force between the knife edges of the movable knife and the fixed knife is large, after thread trimming is finished, the knife edge of the movable knife is still in load contact with the fixed knife or the knife edge of the fixed knife, the movable knife and the fixed knife are easy to deform for a long time, and the service life of the knife is shortened. And the fixed knife is fixed through the bolt, and the goodness of fit between the fixed knife and the movable knife is not adjustable.

Disclosure of Invention

The utility model aims to solve the technical problem that a modified sewing machine trimming device is provided.

For solving the technical problem, the utility model discloses a following technical scheme:

the utility model provides a sewing machine thread trimming device, is in including limit seat, fixed setting the stationary knife seat, the setting on the limit seat are in stationary knife and rotation setting on the stationary knife seat are in on the limit seat can with stationary knife cooperation realizes the sword that moves of trimming, the stationary knife through first fastener with the stationary knife seat is connected, the stationary knife still through eccentric round pin with the stationary knife seat is connected, eccentric round pin rotates to insert and establishes on the stationary knife seat, the stationary knife cover is established on the eccentric part of eccentric round pin, the thread trimming device still including be used for with the eccentric round pin with stationary knife seat relatively fixed's second fastener.

According to some implementation aspects of the utility model, the eccentric pin is established including rotating to insert the round pin axial region on the stationary knife seat, certainly a tip of round pin axial region is followed the length direction of round pin axial region extends the formation eccentric portion and fixed the setting are in location portion on the tip of eccentric portion, the stationary knife cover is established on the eccentric portion and by spacing in location portion and stationary knife seat between.

According to some implementation aspects of the utility model, the correspondence of stationary knife seat the through-hole is seted up to the position of eccentric round pin, the eccentric round pin rotates to insert and establishes in the through-hole, the second fastener is the screw, still seted up on the stationary knife seat can with the screw of through-hole intercommunication, the screw is located in the screw just the tip of screw can support tightly the eccentric round pin is in order to incite somebody to action eccentric round pin and stationary knife seat are fixed relatively.

According to some embodiments of the invention, the through-hole extends in a direction perpendicular to the screw hole.

According to some implementation aspects of the utility model, the eccentric pin is located the below of first fastener, through rotating the eccentric pin is in order to adjust the dead knife with move the goodness of fit between the sword.

According to some implementation aspects of the utility model, the stationary knife includes the stationary knife body and by a tip of stationary knife body is buckled and is extended the connecting portion that forms to side, connecting portion pass through first fastener, eccentric round pin with the stationary knife seat is connected.

According to some aspects of the present invention, the movable blade is located below the fixed blade body, and when cutting a thread, the lower surface of the fixed blade body and the upper surface of the movable blade generate a cutting action; and after the thread trimming is finished, the fixed cutter edge is separated from the movable cutter, and the movable cutter edge is separated from the fixed cutter.

According to some implementation aspects of the utility model, move the sword and be the arc, move the link that the sword has the free end and can be connected with other parts, the side that moves the sword sets up the line and colludes, the opening that the line colluded dorsad move the free end of sword, move the orientation of sword the edge has been seted up on the surface of stationary knife body move the line groove of crossing that the length direction of sword extends, the one end of crossing the line groove is sealed, the other end extends to the line colludes.

According to some embodiments of the utility model, move the sword including be curved and one end with linkage segment that other parts are connected, certainly another tip of linkage segment is followed the length direction of linkage segment extends the sword body section that forms and from move the tip of sword body section and follow move the length direction of sword body section and extend the extension section that forms, the tip of extension section does the free end, the line colludes, crosses the wire casing and sets up respectively move sword body section, the upper surface of extension section is less than in the direction of height move the upper surface of sword body section.

According to some implementation aspects of the utility model, the thread trimming device is still including rotating the setting and being in move the blade holder on the side seat, rotate and insert and establish on the side seat and one end with move the fixed moving cutter arbor that sets up of blade holder and be used for the drive move the cutter arbor and do reciprocating rotation's actuating mechanism around its self axial lead, move cutter fixed connection move on the blade holder.

According to some embodiments of the utility model, move the sword axle along the vertical extension of upper and lower direction.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses sewing machine thread trimming device is when the assembly stationary knife, fixes a position the stationary knife position with first fastener earlier, rethread eccentric pin regulation stationary knife and move the goodness of fit between the sword, make the light cutting of end of a thread.

Drawings

Fig. 1 is a schematic perspective view of a thread trimming device of a sewing machine according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a thread trimming device of a sewing machine according to an embodiment of the present invention (the side base is not shown);

FIG. 3 is an exploded view of a thread trimming device of a sewing machine according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of an eccentric pin of a thread trimming device of a sewing machine according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a movable knife of the thread trimming device of the sewing machine according to an embodiment of the present invention;

in the figure: 1. a side seat; 2. moving a knife; 2a, a wire hook; 2b, a wire passing groove; 2c, a connecting section; 2d, moving the blade body section; 2e, an extension section; m, a first surface; n, a second surface; p, a third surface; 3. fixing a cutter; 3a, a fixed cutter body; 3b, a connecting part; 4. A fixed cutter seat; 5. a first fastener; 6. an eccentric pin; 6a, an eccentric part; 6b, a pin shaft part; 6c, a positioning part; 7. a second fastener; 8. a through hole; 9. a movable cutter seat; 10. a movable cutter shaft; 11. a crank; 12. a connecting rod; 13. a trimming swing connecting rod; 14. a trimming cam; 15. and a lower shaft.

Detailed Description

The invention is further described below with reference to the drawings in the specification:

the thread trimming device of the sewing machine shown in fig. 1-5 comprises a side base 1, a fixed cutter seat 4 fixedly arranged on the side base 1, a fixed cutter 3 fixedly arranged on the fixed cutter seat 4, a movable cutter seat 9 rotatably arranged on the side base 1 and a movable cutter 2 with one end fixedly connected to the movable cutter seat 9 and driven to rotate by the rotation of the movable cutter seat 9, wherein the other end of the movable cutter 2 is a free end, and the movable cutter 2 can be matched with the fixed cutter 3 to realize thread trimming.

In this example, the fixed knife 3 is connected with the fixed knife holder 4 through the first fastening piece 5, the fixed knife 3 is further connected with the fixed knife holder 4 through the eccentric pin 6, the eccentric pin 6 is rotatably inserted on the fixed knife holder 4, and the thread trimming device further comprises a second fastening piece 7 for fixing the eccentric pin 6 and the fixed knife holder 4 relatively, so that the fixed knife 3 and the fixed knife holder 4 are relatively fixed. The eccentric pin 6 is positioned below the first fastening piece 5, and the fit degree between the fixed knife 3 and the movable knife 2 is adjusted by rotating the eccentric pin 6. Specifically, the fixed blade 3 includes a fixed blade body 3a and a connecting portion 3b formed by bending and extending one end portion of the fixed blade body 3a to the side, the connecting portion 3b is connected to the fixed blade holder 4 by a first fastening member 5 and an eccentric pin 6, and the first fastening member 5 is a screw.

As shown in fig. 4, the eccentric pin 6 includes a pin shaft portion 6b rotatably inserted in the stationary holder 4, an eccentric portion 6a formed to extend from one end portion of the pin shaft portion 6b in the longitudinal direction of the pin shaft portion 6b, and a positioning portion 6c fixedly provided in the eccentric portion 6 a. The cross section area of the positioning part 6c is larger than that of the eccentric part 6a along the circumferential direction of the eccentric pin 6, the connecting part 3b of the fixed cutter 3 is sleeved on the eccentric part 6a, and the connecting part 3b of the fixed cutter 3 is limited between the positioning part 6c and the fixed cutter seat 4.

Set up through-hole 8 in the position of the corresponding eccentric pin 6 of stationary knife seat 4, the round pin axle part 6b of eccentric pin 6 rotates and inserts and establish in through-hole 8, and second fastener 7 is the screw, still sets up the screw that can communicate with through-hole 8 on stationary knife seat 4, and the screw setting is in the screw and can cooperate with this screw, and the tip of this screw can be used for supporting the round pin axle part 6b of tight eccentric pin 6 in order to fix eccentric pin 6 and stationary knife seat 4 relatively. Specifically, the extending direction of the through hole 8 and the extending direction of the screw hole are perpendicular to each other.

In this embodiment, the movable blade 2 is located below the fixed blade body 3a of the fixed blade 3, and the lower surface of the fixed blade body 3a and the upper surface of the movable blade 2 generate shearing action to cut the thread, specifically, during thread cutting, the friction between the fixed blade body 3a and the lower surface of the movable blade 2 is gradually increased to contact the thread, so that the service life of the fixed blade 3 can be prolonged.

As shown in fig. 5, the movable blade 2 is arc-shaped, the side of the movable blade 2 is provided with a wire hook 2a, the opening of the wire hook 2a faces away from the free end of the movable blade 2, the upper surface of the movable blade 2 is provided with a wire passing groove 2B extending along the length direction of the movable blade 2, one end of the wire passing groove 2B is closed, the other end of the wire passing groove 2B extends to the wire hook 2a, the closed end of the wire passing groove 2B is close to the free end of the movable blade 2, the other end of the wire passing groove is far away from the free end of the movable blade 2, the upper edge of the closed end of the wire passing groove 2B forms a blade edge a of the movable blade 2, the lower edge of the end of the fixed blade body 3a forms a blade edge B of the fixed blade 3, and the wire cutting. Specifically, the movable blade 2 includes an arc-shaped connecting section 2c with one end fixedly connected to the movable blade holder 9, a movable blade body section 2d formed by extending the other end of the connecting section 2c along the length direction of the connecting section 2c, and an extending section 2e formed by extending the end of the automatic blade body section 2d along the length direction of the movable blade body section 2d, the end of the extending section 2e is the free end, the wire hook 2a and the wire passing groove 2b are respectively arranged on the movable blade body section 2d, and the upper surface of the extending section 2e is lower than the upper surface of the movable blade body section 2d in the height direction. When trimming, the trimming action between the blade A of the movable blade 2 and the blade B of the fixed blade 3 is realized; after the trimming is finished, the blade B of the fixed knife 3 is positioned above the extension section 2e, the blade B of the fixed knife 3 is in no-load contact with the movable knife 2, the lower surface of the fixed knife 3 is in contact with the end part of the movable knife body section 2d, the blade a of the movable knife 2 is positioned below the fixed knife body 3a, the blade a of the movable knife 2 is in no-load contact with the fixed knife 3, and the movable knife 2 and the fixed knife 3 are not easy to deform.

In this example, the distance between the cutting edge a of the movable blade 2 and the end of the movable blade body section 2d (the end near the free end) is about 1.5 mm. The upper surface of the movable blade body section 2d comprises a first surface m, a second surface n and a third surface p which are sequentially distributed along the length direction of the movable blade body section 2d, in the height direction, the first surface m is lower than the second surface n, the second surface n is lower than the third surface p, the first surface m and the second surface n are connected through inclined planes respectively, the wire passing groove 2b extends from the first surface m to the third surface p, and two ends of the wire passing groove 2b are respectively located on the first surface m and the third surface p. The upper surface of the extension 2e is lower than the third surface p in the height direction.

The thread trimming device also comprises a movable cutter shaft 10 which is rotatably inserted on the side base 1 and one end of which is fixedly arranged with the movable cutter base 9, and the movable cutter shaft 10 vertically extends along the vertical direction. The thread trimming device also comprises a driving mechanism for driving the movable cutter shaft 10 to reciprocate in the horizontal direction around the axis line of the movable cutter shaft. In this example, the driving mechanism includes a crank 11 connected to the other end of the movable knife shaft 10, a connecting rod 12, a trimming swing connecting rod 13, a trimming cam 14, a lower shaft 15 and a motor for driving the lower shaft 15 to rotate, one end of the crank 11 is fixedly connected to the movable knife shaft 10, the other end is connected to one end of the connecting rod 12, the other end of the connecting rod 12 is connected to one end of the trimming swing connecting rod 13, the other end of the trimming crank connecting rod 13 is arranged on the trimming cam 14, and the trimming cam 14 is fixedly sleeved on the lower shaft 15.

Through the arrangement, compared with the traditional thread trimming device of the sewing machine, the thread trimming device of the sewing machine has the following advantages:

1) due to the structural design of the movable knife and the fixed knife, the matching degree of the fixed knife and the movable knife can be conveniently completed by adjusting the eccentric pin, so that the thread end is easily cut off.

2) The movable knife edge is closer to the needle hole and the needle edge, and the cut tail thread of the upper thread is shorter than the thread end cut by the traditional short thread end machine.

3) Due to the structural design of the movable knife and the fixed knife, the friction between the knife edge of the movable knife and the knife edge of the fixed knife is smaller than that of the traditional short thread end, so that the service life of the cutting edge is longer than that of the traditional cutting edge.

4) The movable knife and the fixed knife are structurally designed, and the movable knife and the fixed knife shear are in no-load contact after the line is cut, so that the movable knife and the fixed knife are not easy to deform. After the traditional short thread end is cut, the movable cutter is in load contact with the fixed cutter, the movable cutter and the fixed cutter are easy to deform for a long time, and the service life of the cutter is shortened.

5) Compare with traditional sewing machine, the lower surface of stationary knife in the thread trimming process in proper order with move the first surface, second surface and the third surface contact of sword body section, so, during the thread trimming, the stationary knife divides three step face with moving the sword contact time to make move sword and stationary knife increase the frictional contact thread trimming gradually, with the life of extension stationary knife.

6) According to the structural design of the movable knife and the fixed knife, after thread trimming is finished, the knife edge of the fixed knife is positioned above the extension section of the movable knife, the knife edge of the movable knife is positioned below the fixed knife, and gaps are respectively reserved between the knife edge of the fixed knife and the movable knife and between the knife edge of the movable knife and the fixed knife, so that no load contact exists, and when the sewing machine does not work, the situation that the knife deforms due to the load contact between the knife edge of the movable knife and the fixed knife and between the knife edge of the fixed knife and the movable knife is avoided.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a sewing machine thread trimming device, is in including limit seat, fixed setting fixed knife seat, setting on the limit seat are in fixed knife and rotation setting on the fixed knife seat are in on the limit seat can with the cooperation of fixed knife realizes the sword that moves of thread trimming, the fixed knife through first fastener with the fixed knife seat is connected its characterized in that: the fixed cutter is further connected with the fixed cutter seat through an eccentric pin, the eccentric pin is rotatably inserted in the fixed cutter seat, the fixed cutter is sleeved on an eccentric portion of the eccentric pin, and the thread trimming device further comprises a second fastening piece used for fixing the eccentric pin and the fixed cutter seat relatively.

2. The thread trimming device of a sewing machine according to claim 1, wherein: the eccentric pin comprises a pin shaft part which is rotatably inserted on the fixed cutter seat, an eccentric part which is formed by extending one end part of the pin shaft part along the length direction of the pin shaft part, and a positioning part which is fixedly arranged on the end part of the eccentric part, and the fixed cutter is sleeved on the eccentric part and is limited between the positioning part and the fixed cutter seat.

3. The thread trimming device of a sewing machine according to claim 1, wherein: the position of the fixed cutter seat corresponding to the eccentric pin is provided with a through hole, the eccentric pin is rotatably inserted in the through hole, the second fastener is a screw, the fixed cutter seat is further provided with a screw hole communicated with the through hole, the screw is positioned in the screw hole, and the end part of the screw can be tightly abutted against the eccentric pin so as to relatively fix the eccentric pin and the fixed cutter seat.

4. The thread trimming device of a sewing machine according to claim 3, wherein: the extending direction of the through hole is vertical to the extending direction of the screw hole.

5. The thread trimming device of a sewing machine according to claim 1, wherein: the eccentric pin is located below the first fastener, and the fit degree between the fixed knife and the movable knife is adjusted by rotating the eccentric pin.

6. The thread trimming device of a sewing machine according to claim 1, wherein: the fixed cutter comprises a fixed cutter body and a connecting part formed by bending and extending one end part of the fixed cutter body to the side, and the connecting part is connected with the fixed cutter seat through the first fastener and the eccentric pin.

7. The thread trimming device of a sewing machine according to claim 6, wherein: the movable knife is positioned below the fixed knife body, and when a thread is cut, the lower surface of the fixed knife body and the upper surface of the movable knife generate a cutting action; and after the thread trimming is finished, the fixed cutter edge is separated from the movable cutter, and the movable cutter edge is separated from the fixed cutter.

8. The thread trimming device of a sewing machine according to claim 6, wherein: the movable knife is arc-shaped, the movable knife is provided with a free end and a connecting end which can be connected with other components, a wire hook is arranged on the side edge of the movable knife, an opening of the wire hook faces away from the free end of the movable knife, a wire passing groove extending along the length direction of the movable knife is formed in the surface of the movable knife facing the fixed knife body, one end of the wire passing groove is sealed, and the other end of the wire passing groove extends to the wire hook.

9. The thread trimming apparatus for sewing machines according to claim 8, wherein: move the sword including be curved and one end with the linkage segment that other parts are connected, certainly another tip of linkage segment is followed the length direction of linkage segment extends the sword body section that forms and certainly move the tip of sword body section and follow the length direction of moving sword body section extends the extension section that forms, the tip of extension section does the free end, the line colludes, crosses the wire casing and sets up respectively move sword body section, the upper surface of extension section is less than in the direction of height the upper surface of moving sword body section.

10. The thread trimming apparatus for a sewing machine according to any one of claims 1 to 9, wherein: the thread trimming device further comprises a movable cutter holder, a movable cutter shaft and a driving mechanism, wherein the movable cutter holder is rotatably arranged on the side holder, the movable cutter shaft is rotatably inserted into the side holder, one end of the movable cutter shaft is fixedly arranged on the movable cutter holder, the driving mechanism is used for driving the movable cutter shaft to rotate around the axis of the movable cutter shaft in a reciprocating mode, and the movable cutter is fixedly connected to the movable cutter holder.