CN105970507A - Thread trimming mechanism of sewing machine - Google Patents
Thread trimming mechanism of sewing machine Download PDFInfo
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- CN105970507A CN105970507A CN201610494020.8A CN201610494020A CN105970507A CN 105970507 A CN105970507 A CN 105970507A CN 201610494020 A CN201610494020 A CN 201610494020A CN 105970507 A CN105970507 A CN 105970507A
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- main
- auxiliary
- crank
- drive shaft
- sewing machine
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread trimming mechanism of a sewing machine. A rotating shaft is arranged in a case of the sewing machine. The thread trimming mechanism comprises a main tool rest, an auxiliary tool rest and a driving mechanism which are arranged in the case, wherein a main moving cutter is mounted on the main tool rest; an auxiliary moving cutter is mounted on the auxiliary tool rest; an output end of the driving mechanism is connected with a main crank and an auxiliary crank, the main crank is connected with the main tool rest, and the auxiliary crank is connected with the auxiliary tool rest; the output end of the driving mechanism performs reciprocating rotation; the driving mechanism drives the main tool rest to perform reciprocating rotation around the rotating shaft through the main crank and drives the auxiliary tool rest to perform reciprocating rotation around the rotating shaft through the auxiliary crank, so that the main moving cutter and the auxiliary moving cutter move face to face to complete close cutting and move back to back to complete resetting. The driving mechanism is adopted to drive the main crank and the auxiliary crank simultaneously so as to drive the main moving cutter and the auxiliary moving cutter to move oppositely around the rotating shaft for engagement, trimming of opposite threads and bottom threads is completed, and the engaged position of trimmed threads is stable.
Description
Technical field
The present invention relates to sewing machine technique field, particularly relate to the thread cutting mechanism of a kind of sewing machine.
Background technology
The trimming structure of existing sewing machine is in below needle plate and the movable blade above rotating shuttle and stationary knife, and stationary knife is fixed
On sewing machine matrix, movable blade is rotated after being driven by drive mechanism, is engaged cut-out in eedle side movable blade with stationary knife and stitches
Line.
The stitching of sewing machine is mutually to be moved by eedle and rotating shuttle and formed, in order to ensure that under normally sewing state, suture is not
Can encounter the trimming edge of a knife, can not affect the motion of eedle and rotating shuttle simultaneously, movable blade and stationary knife are necessary for avoiding moving part fortune
Dynamic scope, stationary knife is fixed on side, eedle center, causes stationary knife and eedle center will leave a segment distance, movable blade and stationary knife
Position and eedle that blade is overlapping the most just have a segment distance, and the position of blade overlap also can be because of the impact of a variety of causes such as installation
And be varied from, so that it is long and unstable to remain the end of a thread after trimming on sewed product, and stay the residual of eedle side
The end of a thread length is unstable.Remain longer the end of a thread on sewed product to need to increase artificial pruning the end of a thread operation；Length is remained on eedle
Unstable the end of a thread can cause eedle to form bad stitching before sewing next time, affects the quality of sewed product.
Summary of the invention
The shortcoming of prior art in view of the above, the technical problem to be solved in the present invention is to provide one to drive same
Main movable blade is made to realize closing the thread cutting mechanism of the sewing machine cut with auxiliary moving knife move toward one another under the effect in dynamic source.
In order to solve above-mentioned technical problem, the present invention provides the thread cutting mechanism of a kind of sewing machine, sets in the casing of sewing machine
Rotary shaft, thread cutting mechanism is had to include: to be arranged at the main carriage in described casing, auxiliary tool head and drive mechanism；Described main carriage
On main movable blade is installed；Auxiliary moving knife is installed on described auxiliary tool head；The outfan of described drive mechanism and main crank and
Auxiliary crank connects, and described main crank is connected with described main carriage, and described auxiliary crank is connected with described auxiliary tool head；Described drive
The outfan reciprocating rotation of motivation structure；Described drive mechanism drives described main carriage around described rotary shaft by described main crank
Reciprocating rotation, described drive mechanism by described auxiliary crank drive described auxiliary tool head around described rotary shaft reciprocating rotation,
Make described main movable blade complete to close with described auxiliary moving knife move toward one another and cut, make described main movable blade opposing with described auxiliary moving knife
Move reset.
Preferably, described drive mechanism includes: revolving part, drives driving element that described revolving part rotates and makes institute
State the resetting-mechanism that revolving part resets；Drive shaft portion is installed on described revolving part, described drive shaft portion and described main crank and
Described auxiliary crank is fixing to be connected.
Further, described drive shaft portion includes that arranged in parallel and that axial location is fixing main drive shaft and auxiliary are driven
Moving axis, the outfan of described main drive shaft is fixing with described main crank to be connected, and the outfan of described auxiliary drive shaft is auxiliary with described
Help the fixing connection of crank；Described revolving part is sheathed on described auxiliary drive shaft, and described revolving part can be along described process auxiliary drive
Moving axially of axle, when described revolving part is in described transmission station, the outfan of described revolving part is plugged in described master and drives
The input of moving axis.
Further, described main drive shaft be arranged in parallel with described rotary shaft, and described driving element is described for being installed on
Driving cam member in rotary shaft；Described revolving part is provided with driving wheel driven member；When described revolving part is in described transmission work
Position time, described driving wheel driven member is in the side of described driving cam member, described rotary shaft by described driving cam member with
The transmission of described driving wheel driven member, drives described revolving part to rotate around the axis of described main drive shaft.
Further, described resetting-mechanism is reduction torsion spring, described reduction torsion spring include being connected torsion spring body and
Described stop arm, described torsion spring body is sheathed on described main drive shaft, and described stop arm contacts with described main crank, and described
Stop arm drives described main crank to reset.
Further, described resetting-mechanism includes the resetting cam being arranged in described rotary shaft and is arranged at described rotation
Turn the reseting wheel driven member on part；Described rotary shaft, by described resetting cam and the transmission of described reseting wheel driven member, drives
Described revolving part resets.
Further, one end of the body of described main crank is provided with the socket can being sheathed on described main drive shaft
Portion, the free end of described socket part is provided with the first main handle connecting hole, and the body of described main crank is provided with main with described first
The second main handle connecting hole that handle connecting hole is coaxial, main handle securing member sequentially passes through described first main handle connecting hole and described second master
Handle connecting hole, makes described socket part compress described main drive shaft.
Further, the body of described auxiliary crank is provided with the sleeve joint hole that can be sheathed on described auxiliary drive shaft, institute
The side of the body stating auxiliary crank is provided with at least one hole, location connected with described sleeve joint hole；Assisted fasteners penetrates institute
State hole, location, and withstand described auxiliary drive shaft.
Preferably, described main movable blade and described auxiliary moving knife close the underface cutting the eedle that position is in sewing machine.
Preferably, the outer cover of described rotary shaft is provided with axle sleeve, and the lateral surface of described axle sleeve is provided with block, described axle sleeve
On pressing plate is installed；Described main carriage and described auxiliary tool head are sheathed on described axle sleeve successively, and are in described block and institute
State between pressing plate, the spacing between described block and described pressing plate equal to described main carriage and described auxiliary tool head thickness and
Value.
As it has been described above, the thread cutting mechanism of the sewing machine of the present invention, have the advantages that
The present invention uses drive mechanism to simultaneously drive main crank and auxiliary crank, with drive main movable blade with auxiliary moving knife around
Rotary shaft move toward one another simultaneously to be engaged, complete the shearing to upper thread and bottom line, the position making tangent line biting point is stable；Main
Movable blade closes, with auxiliary moving knife, the underface cutting the eedle that position is in sewing machine, the end of a thread remained on sewed product after making trimming
Shorter.
Accompanying drawing explanation
The side perspective structural representation that the thread cutting mechanism of the sewing machine that Fig. 1 is shown as the present embodiment is arranged on base plate.
What the thread cutting mechanism of the sewing machine that Fig. 2 is shown as the present embodiment was arranged on base plate looks up perspective view.
Fig. 3 is shown as the perspective view being provided above eedle of the thread cutting mechanism of the sewing machine of the present embodiment.
Top perspective structural representation when the thread cutting mechanism of the sewing machine that Fig. 4 is shown as the present embodiment is not provided with on base plate
Figure.
Side perspective structural representation when the thread cutting mechanism of the sewing machine that Fig. 5 is shown as the present embodiment is not provided with on base plate
Figure.
Fig. 6 is shown as the structural representation that the main crank of the thread cutting mechanism of the sewing machine of the present embodiment is connected with main drive shaft
Figure.
Fig. 7 is shown as the structure that the auxiliary crank of the thread cutting mechanism of the sewing machine of the present embodiment is connected with auxiliary drive shaft and shows
It is intended to.
Drawing reference numeral explanation
100 rotary shafts
110 axle sleeves
111 blocks
112 pressing plates
200 main carriages
210 main movable blade
300 auxiliary tool heads
310 auxiliary moving knife
400 drive mechanisms
410 revolving parts
411 driving wheel driven members
412 projections
421 drive cam member
431 reduction torsion springs
4311 torsion spring bodies
4312 stop arm
4313 stop parts
4314 connecting portions
432 resetting cams
433 reseting wheel driven members
434 cam part connectors
440 drive shaft portions
441 main drive shafts
4411 grooves
4412 limiting sections
442 auxiliary drive shafts
450 main cranks
451 socket parts
452 first main handle connecting holes
453 second main handle connecting holes
460 auxiliary cranks
461 crank pits
462 sleeve joint holes
463 hole, location
470 master connecting-rods
480 bearing pins
10 eedles
20 base plates
Detailed description of the invention
By particular specific embodiment, embodiments of the present invention being described below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
Refer to accompanying drawing.It should be clear that structure depicted in this specification institute accompanying drawings, ratio, size etc., the most only in order to coordinate
Content disclosed in description, understands for those skilled in the art and reads, being not limited to the present invention enforceable
Qualifications, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size,
Do not affect under effect that the present invention can be generated by and the purpose that can reach, all should still fall at disclosed technology contents
In the range of containing.Meanwhile, in this specification cited as " on ", D score, "left", "right", " middle " and " one " etc.
Term, be merely convenient to understanding of narration, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or
Adjust, changing under technology contents without essence, when being also considered as the enforceable category of the present invention.
Embodiment 1
As shown in Fig. 1 to Fig. 5 and Fig. 7, the thread cutting mechanism of the sewing machine of the present embodiment, it is provided with rotation in the casing of sewing machine
Axle 100, thread cutting mechanism includes:
Main carriage 200, auxiliary tool head 300 and the drive mechanism 400 being arranged in described casing；
Main movable blade 210 is installed on main carriage 200；Auxiliary moving knife 310 is installed on auxiliary tool head 300；
The outfan of drive mechanism 400 is connected with main crank 450 and auxiliary crank 460, main crank 450 and main carriage 200
Connecting, auxiliary crank 460 is connected with auxiliary tool head 300；
The outfan reciprocating rotation of drive mechanism 400；Drive mechanism 400 by main crank 450 drive main carriage 200 around
Rotary shaft 100 reciprocating rotation, drive mechanism 400 drives auxiliary tool head 300 reciprocal around rotary shaft 100 by auxiliary crank 460
Rotate, make main movable blade 210 complete to close cut with auxiliary moving knife 310 move toward one another, make main movable blade 210 and assist moving knife 310 phase
Unlucky move reset.
When thread cutting mechanism carries out trimming action, drive mechanism 400 simultaneously drives main crank 450 and auxiliary crank 460 turns over
Certain angle, main crank 450 drives the main movable blade 210 on main carriage 200 to be close to assist moving knife 310, and auxiliary crank 460 drives
Auxiliary moving knife 310 on auxiliary tool head 300 is close to main movable blade 210, completes trimming action；After thread cutting mechanism trimming, drive machine
Structure 400 drives main crank 450 and auxiliary crank 460 to reset after reversely turning over certain angle, and main crank 450 drives main carriage 200
On main movable blade 210 be reset to initial position, auxiliary crank 460 drives the auxiliary moving knife 310 on auxiliary tool head 300 to be reset to
Initial position, completes homing action.
In order to more stably complete trimming action, make the center of rotation axle in main carriage 200 rotation process and rotary shaft 100
Parallel, make the center of rotation axle in auxiliary tool head 300 rotation process parallel with rotary shaft 100.
Drive mechanism 400 includes: revolving part 410, drive revolving part 410 rotate driving element and make revolving part 410
The resetting-mechanism resetted；Drive shaft portion 440, drive shaft portion 440 and main crank 450 and auxiliary crank are installed on revolving part 410
460 fixing connections.Driving element drives revolving part 410 to rotate, revolving part 410 drives main crank 450 He by drive shaft portion 440
Auxiliary crank 460 rotates, and cuts so that main movable blade 210 completes to close with auxiliary moving knife 310 move toward one another；Revolving part 410 is resetting
Resetting under the effect of mechanism, revolving part 410 drives main crank 450 and auxiliary crank 460 to reset, so that main movable blade 210 is with auxiliary
The opposing motion of power-assist cutter 310 completes to reset.
In the present embodiment, drive shaft portion 440 includes the fixing main drive shaft 441 of arranged in parallel and axial location and auxiliary
Helping drive shaft 412, the outfan of main drive shaft 441 is fixing with main crank 450 to be connected, and the outfan of auxiliary drive shaft 412 is with auxiliary
Help the fixing connection of crank 460；Revolving part 410 is sheathed on auxiliary drive shaft 412, and revolving part 410 can be along auxiliary drive shaft 412
Move axially, when revolving part 410 is in transmission station, the outfan of revolving part 410 is plugged in the input of main drive shaft 441
End.Revolving part 410 along auxiliary drive shaft 412 move axially to transmission station after, drive element drives revolving part 410 turns
Dynamic, owing to the axial location of main drive shaft 441 and the axial location of auxiliary drive shaft 412 are the most fixing, revolving part 410 can be simultaneously
Drive auxiliary drive shaft 412 and main drive shaft 441 to rotate, then main drive shaft 441 and auxiliary crank 460 rotate the most simultaneously；Pass through
Main drive shaft 441 and auxiliary drive shaft 412 drive different cranks respectively, it is possible to ensure the stability of transmission.
In the present invention, main crank 450 and auxiliary crank 460 can also be connected in turn on main drive shaft 441, and this structure is also
It is capable of simultaneously driving main crank 450 and auxiliary crank 460 rotates, be not described in detail here.
Main drive shaft 441 be arranged in parallel with rotary shaft 100, and driving element is the driving cam being installed in rotary shaft 100
Part 421；Revolving part 410 is provided with driving wheel driven member 411；When revolving part 410 is in transmission station, driving wheel driven member
411 are in the sides driving cam member 421, rotary shaft 100 by driving cam member 421 and the transmission of driving wheel driven member 411,
Revolving part 410 is driven to rotate around the axis of main drive shaft 441.In the present embodiment, driving wheel driven member 411 is ball.
The axial location of rotary shaft 100 is fixed, and rotary shaft 100 rotates counterclockwise (in terms of Fig. 3), makes driving cam member 421
Rotate counterclockwise, after driving cam member 421 to contact with driving wheel driven member 411, drive driving wheel driven member 411, revolving part 410
Axis around auxiliary drive shaft 412 rotates clockwise, then auxiliary drive shaft 412 and main drive shaft 441 are just along with revolving part
410 rotate clockwise, by the reasonable in design cam curve driving cam member 421, it is possible to obtain suitably rotational angle.Auxiliary
Help drive shaft 412 and the rotational angle of main drive shaft 441, make on the main movable blade 210 on main carriage 200 and auxiliary tool head 300
Auxiliary moving knife 310 around rotary shaft 100 turn to be engaged trimming position.
In the present embodiment, motor-driven rotation axle 100 rotates, and the driving cam member 421 in rotary shaft 100 drives revolving part
410；In the present invention, it is also possible to drive element drives revolving part 410 by electric magnet, motor, cylinder or other axle construction etc.
Rotate, be not described in detail here.
In the present embodiment, the outfan of revolving part 410 is provided with projection 412, and the input of main drive shaft 441 is provided with confession
The groove 4411 that projection 412 inserts, has rotating shuttle owing to connecting in rotary shaft 100, so, before trimming, the output of revolving part 410
End separates with the input of main drive shaft 441, when needs trimming, promotes axial along auxiliary drive shaft 412 of revolving part 410
Mobile to transmission station, projection 412 is inserted in groove 4411, makes revolving part 410 be connected with main drive shaft 441.
Resetting-mechanism is reduction torsion spring 431, and reduction torsion spring 431 includes be connected torsion spring body 4311 and stop arm 4312,
Torsion spring body 4311 is sheathed on main drive shaft 441, and stop arm 4312 contacts with main crank 450, and stop arm 4312 drives main
Crank 450 resets.During main crank 450 rotates clockwise around main drive shaft 441, main crank 450 and stop arm 4312
Contact and main crank 450 promote stop arm 4312 to reverse, and after main crank 450 has rotated, the reply of stop arm 4312 is tried hard to recommend
Dynamic main crank 450 rotates counterclockwise, and main crank 450 realizes resetting, and main crank 450 rotates while resetting, and passes through revolving part
410, auxiliary drive shaft 412 transmission, makes auxiliary crank 460 rotate counterclockwise, it is achieved reset.
In the present embodiment, stop arm 4312 includes that the stop part 4313 be arrangeding in parallel with main crank 450, stop part 4313 lead to
Cross connecting portion 4314 to be connected with torsion spring body 4311；Stop part 4313 contacts with main crank 450, under normal sewing state, and resistance
Stopper 4313 has barrier force to main crank 450, makes main carriage 200 and auxiliary tool head 300 stable at initial position, main movable blade
210 and auxiliary moving knife 310 lay respectively at the both sides of axis of eedle 10, now, sewing machine is normally sewed.
Due to when reduction torsion spring 431 uses it may happen that fault, it is impossible to drive main crank 450 to reset, so, this enforcement
The thread cutting mechanism of the sewing machine of example is additionally provided with another resetting-mechanism, and resetting-mechanism includes the reset being arranged in rotary shaft 100
Cam 432 and the reseting wheel driven member 433 being arranged on revolving part 410；Rotary shaft 100 is by resetting cam 432 and reseting wheel
The transmission of driven member 433, drives revolving part 410 to reset.By the cam curve of resetting cam 432 reasonable in design, rotary shaft
100 drive resetting cams 432 to rotate counterclockwise, then resetting cam 432 with can be after reseting wheel driven member 433 contacts, resetting cam
432 drive reseting wheel driven member 433 to rotate counterclockwise suitable angle around the axis of auxiliary drive shaft 412, make reseting wheel
Driven member 433 drives revolving part 410 to rotate counterclockwise realization reset, then revolving part 410 drives main crank 450 and auxiliary song simultaneously
Handle 460 resets.In the present embodiment, reseting wheel driven member 433 is return pin.
In the present embodiment, resetting cam 432 is convex with driving by the cam part connector 434 being arranged in rotary shaft 100
Gear member 421 connects, and resetting cam 432, cam part connector 422 and driving cam member 421 constitute cam pack.
Main crank 450 is connected with main carriage 200 by master driver；Master driver is master connecting-rod 470, master connecting-rod 470
One end is hinged with main crank 450, and the other end of master connecting-rod 470 is hinged with main carriage 200, master connecting-rod 470 and the hinge of main crank 450
Spindle, master connecting-rod 470 are parallel to each other with jointed shaft, the rotary shaft 100 of main carriage 200.
Auxiliary crank 460 is connected with auxiliary tool head 300 by accessory drive part；Accessory drive part is bearing pin 480, auxiliary song
Handle 460 is provided with crank pit 461, and crank pit 461, the other end of bearing pin 480 and auxiliary tool head 300 are inserted in one end of bearing pin 480
Connecting, bearing pin 480 is parallel with rotary shaft 100.
When thread cutting mechanism carries out trimming action, rotary shaft 100 rotates counterclockwise certain angle, makes driving cam member 421 inverse
Hour hands rotate (in terms of Fig. 3), drive cam member 421 to drive driving wheel driven member 411 and revolving part 410 around auxiliary drive shaft
The axis of 412 rotates clockwise, then auxiliary drive shaft 412 and main drive shaft 441 all rotate clockwise, and main drive shaft 441 leads to
Cross main crank 450 and master connecting-rod 470 drives main carriage 200 to rotate around rotary shaft 100, so that being fixed on main carriage 200
Main movable blade 210 be close to assist moving knife 310；Auxiliary drive shaft 412 is by auxiliary crank 460 and bearing pin 480 band dynamic auxiliary cutter
Frame 300 rotates around rotary shaft 100, so that the auxiliary moving knife 310 being fixed on auxiliary tool head 300 is close to main movable blade 210,
Complete trimming action；
After thread cutting mechanism trimming, after resetting-mechanism drives main crank 450 and auxiliary crank 460 to turn over certain angle counterclockwise
Resetting, main drive shaft 441 drives main carriage 200 to rotate around rotary shaft 100, so that being fixed on operator by master connecting-rod 470
Main movable blade 210 on frame 200 is away from auxiliary moving knife 310 and is retracted into initial position；Auxiliary drive shaft 412 is by bearing pin 480
Auxiliary tool head 300 is driven to rotate around rotary shaft 100, so that the auxiliary moving knife 310 being fixed on auxiliary tool head 300 is away from master
Movable blade 210 is also retracted into initial position, completes homing action.
In the present invention, accessory drive part may be used without connecting rod, is not described in detail here.
As shown in Figure 6, one end of the body of main crank 450 is provided with the socket part can being sheathed on main drive shaft 441
451, the free end of socket part 451 is provided with the first main handle connecting hole 452, and the body of main crank 450 is provided with and described first
The second main handle connecting hole 453 that main handle connecting hole 452 is coaxial, main handle securing member sequentially passes through the first main handle connecting hole 452 and institute
State the second main handle connecting hole 453, make socket part 451 compress main drive shaft 441.In the present embodiment, the second main handle connecting hole 453 is
Screwed hole, main handle securing member is screw.
Before main handle securing member is installed, socket part 451 can rotate relative to main drive shaft 441, makes the body of main crank 450
And the angle change between the axis of main drive shaft 441, after main crank 450 is turned to correct position, main handle securing member
Sequentially pass through the first main handle connecting hole 452 and described second main handle connecting hole 453, make socket part 451 compress main drive shaft 441,
Now, the free end of socket part 451 is connected by main handle securing member with the body of main crank 450, and socket part 451 will not be relative to
Main drive shaft 441 rotates.
As it is shown in fig. 7, the body of auxiliary crank 460 is provided with the sleeve joint hole 462 that can be sheathed on auxiliary drive shaft 442, auxiliary
The side helping the body of crank 460 is provided with at least one hole, location 463 connected with sleeve joint hole 462, and assisted fasteners penetrates
Hole, described location 463, and withstand auxiliary drive shaft 442.
Before assisted fasteners is installed, auxiliary crank 460 can rotate relative to auxiliary drive shaft 442, makes auxiliary crank 460
And the angle change between the axis of auxiliary drive shaft 412, after auxiliary crank 460 is turned to correct position, auxiliary is tight
Firmware penetrates hole, described location 463, and auxiliary drive shaft 442 is withstood in the end of assisted fasteners, and now, auxiliary crank 460 is with auxiliary
Helping drive shaft 442 to be fastenedly connected, auxiliary crank 460 will not rotate relative to auxiliary drive shaft 442.In the present embodiment, position hole
463 is screwed hole, and assisted fasteners is screw.
As shown in Figures 1 to 5, when the present invention installs, by adjusting in body and the main drive shaft 441 of main crank 450
Angle between axis, adjusts the angle between auxiliary crank 460 and the axis of auxiliary drive shaft 412, can make main movable blade
210 with auxiliary moving knife 310 close the underface cutting the eedle 10 that position is in sewing machine.This structure can guarantee that sewed product after trimming
Upper residual the end of a thread is shorter, and after solving sewing trimming, sewed product manually prunes the end of a thread operation, can make eedle 10 after trimming simultaneously
Side residual stub is more stable, it is ensured that next time plays the aesthetics of suture mark.
In the present invention, the center of rotation of main carriage 200 and the center of rotation of auxiliary tool head 300 may be at same axis,
Can also be on the not coaxial line that is parallel to each other.
In the present embodiment, rotary shaft 100, main drive shaft 441 and auxiliary drive shaft 412 are installed on the base plate 20 of casing,
One end away from main drive shaft 441 of main crank 450 is provided with limiting section 4412, under normal sewing state, and main carriage 200 He
Auxiliary tool head 300 is in initial position, and the stop part 4313 of reduction torsion spring 431 is to applying the barrier force of main crank 450 simultaneously, main
The limiting section 4412 of crank 450 withstands base plate 20, makes main carriage 200 and auxiliary tool head 300 stable at initial position, so that main
Movable blade 210 and auxiliary moving knife 310 lay respectively at the both sides of the axis of eedle 10, and sewing machine can normally be sewed.
The outer cover of rotary shaft 100 is provided with axle sleeve 110, and rotary shaft 100 can rotate relative to axle sleeve 110, outside axle sleeve 110
Side is provided with block 111, and one end of axle sleeve 110 is provided with pressing plate 112；Main carriage 200 and auxiliary tool head 300 are the most sheathed
On axle sleeve 110, and main carriage 200 and auxiliary tool head 300 are between block 111 and pressing plate 112；Block 111 and pressing plate 112
Between spacing equal to main carriage 200 be added with the thickness of auxiliary tool head 300 and value.Main carriage 200 and auxiliary tool head 300 can
Rotating relative to axle sleeve 110, main carriage 200 and auxiliary tool head 300 are played position-limiting action by block 111 and pressing plate 112, it is to avoid main
Axial displacement is there is in knife rest 200 and auxiliary tool head 300 in rotation process.
In the present embodiment, main carriage 200 closer to driving cam member 421, in the present invention, is led compared with auxiliary tool head 300
The order that knife rest 200 and auxiliary tool head 300 are installed in rotary shaft 100 is commutative.
The present invention also provides for a kind of sewing machine, and sewing machine uses the thread cutting mechanism of sewing machine to complete cutting of upper thread and bottom line
Cut.
The present invention uses drive mechanism 400 to simultaneously drive main crank 450 and auxiliary crank 460, makes main movable blade 210 with auxiliary
Power-assist cutter 310 is engaged around rotary shaft 100 move toward one another simultaneously, completes the shearing to upper thread and bottom line, makes tangent position
Do not affected by other factors such as installations, it is ensured that the position of tangent line biting point is stable.Main movable blade 210 and auxiliary moving knife 310
Closing the underface cutting the eedle 10 that position is in sewing machine, the end of a thread remained on sewed product after making trimming is shorter.
To sum up, the present embodiment effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The principle of above-described embodiment only illustrative the present embodiment and effect thereof, not for limiting the present embodiment.Appoint
Above-described embodiment all can be modified under the spirit and the scope of the present embodiment or change by what those skilled in the art
Become.Therefore, art has usually intellectual such as thinking with technology without departing from the spirit disclosed in the present embodiment
Think that lower all completed equivalences are modified or change, must be contained by the claim of the present embodiment.
Claims (10)
1. a thread cutting mechanism for sewing machine, is provided with rotary shaft (100), it is characterised in that thread cutting mechanism in the casing of sewing machine
Including:
Main carriage (200), auxiliary tool head (300) and the drive mechanism (400) being arranged in described casing；
Main movable blade (210) is installed on described main carriage (200)；Described auxiliary tool head is provided with auxiliary moving knife on (300)
(310)；
The outfan of described drive mechanism (400) is connected with main crank (450) and auxiliary crank (460), described main crank (450)
Being connected with described main carriage (200), described auxiliary crank (460) is connected with described auxiliary tool head (300)；
The outfan reciprocating rotation of described drive mechanism (400)；Described drive mechanism (400) is carried by described main crank (450)
Dynamic described main carriage (200) is around described rotary shaft (100) reciprocating rotation, and described drive mechanism (400) is by described auxiliary song
Handle (460) drive described auxiliary tool head (300) around described rotary shaft (100) reciprocating rotation, make described main movable blade (210) with
Described auxiliary moving knife (310) move toward one another completes to close cuts, and makes described main movable blade (210) opposing with described auxiliary moving knife (310)
Move reset.
The thread cutting mechanism of sewing machine the most according to claim 1, it is characterised in that: described drive mechanism (400) including: rotates
Part (410), drive the driving element that described revolving part (410) rotates and the reset machine making described revolving part (410) reset
Structure；Drive shaft portion (440) is installed on described revolving part (410), described drive shaft portion (440) and described main crank (450) and
Described auxiliary crank (460) is fixing to be connected.
The thread cutting mechanism of sewing machine the most according to claim 2, it is characterised in that:
Described drive shaft portion (440) includes arranged in parallel and that axial location is fixing main drive shaft (441) and process auxiliary drive
Axle (442), the outfan of described main drive shaft (441) is fixing with described main crank (450) to be connected, described auxiliary drive shaft
(442) outfan is fixing with described auxiliary crank (460) to be connected；Described revolving part (410) is sheathed on described auxiliary drive shaft
(442) on, described revolving part (410) can moving axially along described auxiliary drive shaft (442), when described revolving part (410)
When being in described transmission station, the outfan of described revolving part (410) is plugged in the input of described main drive shaft (441).
The thread cutting mechanism of sewing machine the most according to claim 3, it is characterised in that:
Described main drive shaft (441) be arranged in parallel with described rotary shaft (100), and described driving element is for being installed on described rotary shaft
(100) the driving cam member (421) on；Described revolving part (410) is provided with driving wheel driven member (411)；
When described revolving part (410) is in described transmission station, described driving wheel driven member (411) is in described driving cam
The side of part (421), described rotary shaft (100) is by described driving cam member (421) and described driving wheel driven member (411)
Transmission, drives described revolving part (410) to rotate around the axis of described main drive shaft (441).
The thread cutting mechanism of sewing machine the most according to claim 3, it is characterised in that: described resetting-mechanism is reduction torsion spring
(431), described reduction torsion spring (431) includes be connected torsion spring body (4311) and stop arm (4312), described torsion spring body
(4311) being sheathed on described main drive shaft (441), described stop arm (4312) contacts with described main crank (450), and described
Stop arm (4312) drives described main crank (450) to reset.
The thread cutting mechanism of sewing machine the most according to claim 3, it is characterised in that: described resetting-mechanism includes being arranged at described
Resetting cam (432) in rotary shaft (100) and the reseting wheel driven member (433) being arranged on described revolving part (410)；Described
Rotary shaft (100), by described resetting cam (432) and the transmission of described reseting wheel driven member (433), drives described revolving part
(410) reset.
The thread cutting mechanism of sewing machine the most according to claim 3, it is characterised in that: the one of the body of described main crank (450)
End is provided with the socket part (451) can being sheathed on described main drive shaft (441), and the free end of described socket part (451) sets
Having the first main handle connecting hole (452), the body of described main crank (450) is provided with same with described first main handle connecting hole (452)
Second main handle connecting hole (453) of axle, main handle securing member sequentially passes through described first main handle connecting hole (452) and described second master
Handle connecting hole (453), makes described socket part (451) compress described main drive shaft (441).
The thread cutting mechanism of sewing machine the most according to claim 3, it is characterised in that: on the body of described auxiliary crank (460)
It is provided with the sleeve joint hole (462) that can be sheathed on described auxiliary drive shaft (442), on the side of the body of described auxiliary crank (460)
It is provided with at least one hole, location (463) connected with described sleeve joint hole (462)；Assisted fasteners penetrates hole, described location (463),
And withstand described auxiliary drive shaft (442).
The thread cutting mechanism of sewing machine the most according to claim 1, it is characterised in that: described main movable blade (210) is auxiliary with described
Power-assist cutter (310) close the underface cutting the eedle (10) that position is in sewing machine.
The thread cutting mechanism of sewing machine the most according to claim 1, it is characterised in that: the outside of described rotary shaft (100) is sheathed
Having axle sleeve (110), the lateral surface of described axle sleeve (110) to be provided with block (111), described axle sleeve is provided with pressing plate on (110)
(112)；Described main carriage (200) and described auxiliary tool head (300) are sheathed on described axle sleeve (110) successively, and are in described
Between block (111) and described pressing plate (112), the spacing between described block (111) and described pressing plate (112) is equal to described master
The thickness of knife rest (200) and described auxiliary tool head (300) and value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610494020.8A CN105970507B (en) | 2016-06-24 | 2016-06-24 | The thread cutting mechanism of sewing machine |
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| CN201610494020.8A CN105970507B (en) | 2016-06-24 | 2016-06-24 | The thread cutting mechanism of sewing machine |
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| CN105970507A true CN105970507A (en) | 2016-09-28 |
| CN105970507B CN105970507B (en) | 2019-01-25 |
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| CN201610494020.8A Active CN105970507B (en) | 2016-06-24 | 2016-06-24 | The thread cutting mechanism of sewing machine |
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| CN106835527A (en) * | 2017-04-01 | 2017-06-13 | 杰克缝纫机股份有限公司 | A kind of sewing machine automatic shearing mechanism and sewing machine |
| CN106894175A (en) * | 2017-04-01 | 2017-06-27 | 杰克缝纫机股份有限公司 | A kind of sewing machine automatic shearing mechanism and sewing machine |
| CN106948103A (en) * | 2017-04-01 | 2017-07-14 | 杰克缝纫机股份有限公司 | A kind of thread shearing device of sewing machine and sewing machine |
| CN107022856A (en) * | 2017-06-15 | 2017-08-08 | 浙江美机缝纫机有限公司 | The driving of sewing machine and thread cutting mechanism |
| CN107119394A (en) * | 2017-06-23 | 2017-09-01 | 西安标准工业股份有限公司 | The thread cutting mechanism of double-crank driving |
| CN107268202A (en) * | 2017-08-11 | 2017-10-20 | 杰克缝纫机股份有限公司 | The thread cutting mechanism of sewing machine |
| CN109234929A (en) * | 2018-12-03 | 2019-01-18 | 浙江美机缝纫机有限公司 | A kind of thread cutting mechanism and sewing machine of sewing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106835527A (en) * | 2017-04-01 | 2017-06-13 | 杰克缝纫机股份有限公司 | A kind of sewing machine automatic shearing mechanism and sewing machine |
| CN106894175A (en) * | 2017-04-01 | 2017-06-27 | 杰克缝纫机股份有限公司 | A kind of sewing machine automatic shearing mechanism and sewing machine |
| CN106948103A (en) * | 2017-04-01 | 2017-07-14 | 杰克缝纫机股份有限公司 | A kind of thread shearing device of sewing machine and sewing machine |
| CN106835527B (en) * | 2017-04-01 | 2019-05-07 | 杰克缝纫机股份有限公司 | A kind of sewing machine automatic shearing mechanism and sewing machine |
| CN106948103B (en) * | 2017-04-01 | 2019-12-17 | 杰克缝纫机股份有限公司 | Thread trimming device of sewing machine and sewing machine |
| CN106894175B (en) * | 2017-04-01 | 2020-01-31 | 杰克缝纫机股份有限公司 | automatic thread trimming mechanism of sewing machine and sewing machine |
| CN107022856A (en) * | 2017-06-15 | 2017-08-08 | 浙江美机缝纫机有限公司 | The driving of sewing machine and thread cutting mechanism |
| CN107119394A (en) * | 2017-06-23 | 2017-09-01 | 西安标准工业股份有限公司 | The thread cutting mechanism of double-crank driving |
| CN107268202A (en) * | 2017-08-11 | 2017-10-20 | 杰克缝纫机股份有限公司 | The thread cutting mechanism of sewing machine |
| CN109234929A (en) * | 2018-12-03 | 2019-01-18 | 浙江美机缝纫机有限公司 | A kind of thread cutting mechanism and sewing machine of sewing machine |
| CN109234929B (en) * | 2018-12-03 | 2024-04-09 | 美机科技集团有限公司 | Thread cutting mechanism of sewing machine and sewing machine |
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Address after: 318010 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |