CN206438278U - A kind of thread cutting mechanism and sewing machine - Google Patents
A kind of thread cutting mechanism and sewing machine Download PDFInfo
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- CN206438278U CN206438278U CN201720088863.8U CN201720088863U CN206438278U CN 206438278 U CN206438278 U CN 206438278U CN 201720088863 U CN201720088863 U CN 201720088863U CN 206438278 U CN206438278 U CN 206438278U
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- knife rest
- motion
- lower axle
- knife
- motion knife
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Abstract
The utility model belongs to sewing device technical field, refers in particular to a kind of thread cutting mechanism and sewing machine.One of which thread cutting mechanism, including lower axle, in lower outer shaft sleeve provided with motion knife rest, are provided with knife one, motion knife rest is connected with clutch, and clutch makes motion knife rest connect or separate with lower axle by power part driving on motion knife rest；During connection, motion knife rest is rotated together with lower axle, and knife one realizes rotation trimming action with knife two；During separation, lower axle is rotated, and motion knife rest is not rotated.The utility model drives motion knife rest and lower axle synchronous rotary to follow rotating shuttle to rotate a circle and then realize with stationary knife to rotate the action of trimming by clutch, it is to avoid the dependence in existing structure to trimming cam.The motion process of trimming is simplified, and simplifies the structure of whole cutting facility, the reliability of trimming function is high.
Description
Technical field
The utility model belongs to sewing device technical field, refers in particular to a kind of thread cutting mechanism and sewing machine.
Background technology
Sewing machine needs to carry out trimming after every completion once sewing operation, that is, will connect between eedle and sewing
Suture is cut.Traditional sewing machine does not have trimming function in itself, it is necessary to which operating personnel complete trimming action using scissors etc..Pin
The defect existed to artificial trimming, research staff adds trimming function on sewing machine.Such cutting facility includes fixation
Stationary knife on casing, and reciprocating moving knife.Its operation principle is：When progress sewing needs trimming
Wait, drive an arrangement of clutch to carry out cutting facility and sewing machine main motion mechanism by drive device (such as electromagnet, cylinder)
Connection, by the cam with given shape on main motion mechanism (upper axle, lower axle, feed lifting rock shaft etc.), by main motion
The motion of mechanism is delivered in the moving knife drive mechanism of cutting facility according to certain sequential relationship, makes moving knife drive mechanism on demand
Time for wanting, track motion, move the line for needing to cut at stationary knife to by the action such as separated time, bracing wire with moving knife, two edges of a knife
Trimming is realized in occlusion.Complete after trimming action, moving knife drive mechanism resets to original position under the effect such as cam or spring, prepares
Trimming next time.Cutting facility and so on carries out each trimming action.With the enhancing of research and development ability, on sewing machine
Cutting facility pass through long-run development and improvement, be more reliably achieved trimming function；But there are still defect：This is cut
Line apparatus needs the complicated cam parts in a track, and relies on cam locus shape higher, it is necessary to which the accuracy of track is come
Ensure the reliability of trimming function.
The content of the invention
The purpose of this utility model is to provide a kind of structure and trimming action simplifies, the trimming that the reliability of trimming function is high
Mechanism and sewing machine.
What the utility model was realized in：
One of purpose of the present utility model is to provide a kind of thread cutting mechanism, including lower axle, in lower outer shaft sleeve provided with fortune
Movable knife rack, is provided with knife one on motion knife rest, and motion knife rest is connected with clutch, and clutch is made by power part driving
Motion knife rest is connected or separated with lower axle；During connection, motion knife rest is rotated together with lower axle, and knife one realizes rotation trimming with knife two
Action；During separation, lower axle is rotated, and motion knife rest is not rotated；
The clutch includes the drive shaft being arranged on chassis backplane in the mounting hole of relevant position, drive shaft energy
Moved in mounting hole to rotating shuttle direction or away from rotating shuttle direction, the head of drive shaft is provided with shift fork, one end of shift fork and fortune
Movable knife rack is connected, the afterbody connection power part of drive shaft, and taper external gear is provided with the lower axle of motion knife rest side,
The motion knife rest is provided with taper internal gear close to one end of taper external gear, and shift fork promotes motion knife rest to be moved to rotating shuttle direction
It is dynamic, the taper external gear on motion knife rest is realized that motion knife rest is synchronous with lower axle with the taper internal gear engagement on motion knife rest
Rotate, resetting-mechanism is provided with the driving shaft, and drive shaft is connected with power part.
In a kind of above-mentioned sewing machine, the lower outer shaft sleeve is provided with lower axle protheca, and motion knife rest is set in lower axle protheca
Outside, one end of shift fork is set on motion knife rest.
In a kind of above-mentioned thread cutting mechanism, motion knife rest hole is provided with the chassis backplane, motion knife rest is arranged on
On motion knife rest hole and outside the head stretching motion knife rest hole of motion knife rest, the outer wall of knife rest is moved with moving the interior of knife rest hole
Wall is connected, and one end of shift fork is connected on the head of motion knife rest.
In a kind of above-mentioned thread cutting mechanism, the motion knife rest includes tool-post structure one and tool-post structure two, tool-post structure one
Include the main body being set in outside lower axle or lower axle protheca, convex annular edge is provided with one end of main body, knife rest two is arranged and solid
Outside the main body for being scheduled on tool-post structure one, the mounting seat of knife one is provided with tool-post structure two, the taper internal gear is located at tool-post structure two
On, the annular groove for installing shift fork is formed between tool-post structure two and convex annular edge.
In a kind of above-mentioned thread cutting mechanism, the resetting-mechanism is the tail of power part, power part and drive shaft
Portion is connected by joint, drives motion knife rest, clutch to reset by power part；
In a kind of above-mentioned thread cutting mechanism, the resetting-mechanism is back-moving spring, the tail end and power part of drive shaft
Contact connection, catch is provided with tail end, and one end of back-moving spring is held out against on catch, the other end is held out against on chassis backplane,
When power part power disappears, motion knife rest, clutch is driven to reset by back-moving spring.
In a kind of above-mentioned thread cutting mechanism, the knife one includes the installation portion being connected with motion knife rest, in installation portion
Side be provided with blade body, blade body and the L-shaped structure of installation portion are provided with point of a knife in the front end of blade body, after
End is provided with cutting edge.
In a kind of above-mentioned thread cutting mechanism, the knife two is stationary knife or moving knife.
In a kind of above-mentioned thread cutting mechanism, when the motion knife rest is connected with lower axle, motion knife rest is together with lower axle
360 ° of rotations.
Another purpose of the present utility model is to provide a kind of sewing machine, including a kind of above-mentioned thread cutting mechanism.
The advantage that the utility model is protruded compared with prior art is：
The utility model by clutch drive motion knife rest and lower axle synchronous rotary follow rotating shuttle rotate a circle and then
The action of rotation trimming is realized with stationary knife, it is to avoid the dependence in existing structure to trimming cam.Simplify being moved through for trimming
Journey, and the structure of whole cutting facility is simplified, the reliability of trimming function is high.
Brief description of the drawings
Fig. 1 is schematic diagram when motion knife rest of the present utility model is not connected with taper external gear；
Fig. 2 is schematic diagram when motion knife rest of the present utility model is connected with taper external gear；
Fig. 3 is schematic diagram of the present utility model；
Fig. 4 is the schematic diagram of the utility model knife one；
Fig. 5 is the schematic diagram of the tool-post structure two of the utility model motion knife rest；
Fig. 6 is the simplified schematic diagram of the tool-post structure one of the utility model motion knife rest；
Fig. 7 is the schematic diagram of taper external gear of the present utility model；
Fig. 8 is the simplified schematic diagram that motion knife rest of the present utility model is connected on chassis backplane；
Fig. 9 is shift fork of the present utility model and the schematic diagram of drive shaft.
In figure：1st, lower axle；2nd, knife rest is moved；3rd, moving knife；4th, knife two；5th, chassis backplane；6th, drive shaft；7th, shift fork；8th, bore
Shape external gear；9th, taper internal gear；10th, lower axle protheca；11st, tool-post structure one；12nd, tool-post structure two；13rd, main body；14th, convex annular
Edge；15th, the mounting seat of knife one；16th, back-moving spring；17th, catch；18th, electromagnet；19th, installation portion；20th, blade body；21st, point of a knife；
22nd, cutting edge；23rd, bracing wire groove；24th, eedle.
Embodiment
The utility model is further described with specific embodiment below, referring to Fig. 1-9：
Rotating shuttle is provided with a kind of thread cutting mechanism, including lower axle 1, lower axle 1.Motion knife rest 2 is arranged with outside lower axle 1,
Be provided with knife one on motion knife rest 2, the present embodiment is set as moving knife 3, motion knife rest 2 is connected with clutch, clutch by
Power part driving motion knife rest 2 is rotated or is separated together with lower axle 1, with reference to when, motion knife rest 2 rotated together with lower axle 1,
Moving knife 3 realizes rotation trimming action with knife 24, and wherein knife 24 can be stationary knife or moving knife.When knife 24 is stationary knife,
It is arranged on by screw on chassis backplane 5, is that the rotation of moving knife 3 is engaged completion trimming action with stationary knife by knife one；It is used as moving knife
When, on another knife rest, the band rotation of moving knife 24 is moved by the knife rest completion trimming action is engaged with knife one.Separation
When, lower axle 1 is rotated, and motion knife rest 2 is not rotated, i.e., acted without trimming.
The utility model is departing from the trimming cam in existing structure, and the action rotated a circle using the main motion of lower axle 1 is complete
Into a trimming process, from initial position, rotate a circle, be eventually returned to initial position, complete a trimming.It can realize
The simplification of motion process, and the part of cutting facility is simplified, more reliably realize sewing machine trimming.
Specifically, clutch described in the utility model includes the installation for being arranged on relevant position on chassis backplane 5
Drive shaft 6 in hole, drive shaft 6 can be in mounting hole to rotating shuttle direction or away from the movement of rotating shuttle direction, and the head of drive shaft 6 is set
Shift fork 7 is equipped with, one end of shift fork 7 is connected with motion knife rest 2, the afterbody connection power part of drive shaft 6, positioned at motion knife rest 2
It is provided with taper external gear 8, the inner hole wall of the one end of the motion knife rest 2 close to taper external gear 8 and sets in the lower axle 1 of side
Taper internal gear 9 is equipped with, shift fork 7 promotes motion knife rest 2 to be moved to rotating shuttle direction, makes taper external gear 8 with moving on knife rest 2
Motion knife rest 2 and the synchronous axial system of lower axle 1 are realized in the engagement connection of taper internal gear 9, and resetting-mechanism is provided with drive shaft 6, and
Drive shaft 6 is connected with power part.
Shift fork 7 is integral type structure with drive shaft 6 or is fixedly connected by modes such as screw, welding.
According to actual design situation, lower axle protheca 10 is arranged with outside the lower axle 1, motion knife rest 2 is set in lower axle protheca
Outside 10, one end of shift fork 7 is set on motion knife rest 2.
In addition, being provided with motion knife rest hole on the chassis backplane 5, motion knife rest 2 is arranged on motion knife rest hole and transported
The head of movable knife rack 2 is stretched out outside motion knife rest hole, and the outer wall for moving knife rest 2 is connected with the inwall in motion knife rest hole, shift fork 7
One end is connected on the head of motion knife rest 2.
Specifically, the motion knife rest 2 includes tool-post structure 1 and tool-post structure 2 12, and tool-post structure 1, which includes, to be arranged
Main body 13 outside lower axle 1 or lower axle protheca 10, convex annular is provided with one end of main body 13 along 14, tool-post structure 2 12 is arranged simultaneously
It is fixed on outside the main body 13 of tool-post structure 1, the mounting seat 15 of knife one is provided with tool-post structure 2 12, and set on tool-post structure 2 12
Taper internal gear 9 is equipped with, tool-post structure 2 12 and convex annular are formed with the annular groove for installing shift fork 7 along between 14.This reality
The outer cylinder for applying the main body 13 of example is step surface, includes two different diameters.
Certainly, motion knife rest 2 can also be integral structure, be provided with annular groove on motion knife rest 2, the annular is recessed
Groove is used to install shift fork 7.
After trimming is completed, motion knife rest 2, clutch are required to reset, due to clutch of the present utility model not
Interfering movement knife rest 2 is around lower axle protheca 10 or rotatable around its axis, and therefore, the resetting-mechanism can select to drive drive shaft 6
Mobile power part, that is to say, that resetting-mechanism is power part.Power part can be connected with drive shaft 6 by joint
Connect, drive motion knife rest 2, clutch to reset when being resetted by power part.
Certainly, resetting-mechanism can also be back-moving spring 16.Now, the tail end of the drive shaft 6 is used with power part
Contact connection.The tail end of drive shaft 6 is provided with catch 17, to facilitate installation, the catch 17 of the present embodiment is from card
Spring or the baffle plate with stud, are screwed onto on the end face of drive shaft 6 by stud.One end of back-moving spring 16 is held out against in catch 17
The upper, other end is held out against on chassis backplane 5, when power part power disappears, driven by back-moving spring 16 move knife rest 2, from
Close reset.
Power part described in the utility model can select electromagnet 18 or cylinder or motor etc..The present embodiment selects electromagnetism
Iron 18.Electromagnet 18 is fixed on chassis backplane 5 by mounting bracket.
The utility model uses rotation trimming, therefore, and traditional moving knife can not be applied to this structure.The knife one is wrapped
The installation portion 19 being connected with motion knife rest 2 is included, blade body 20, blade body 20 and peace are provided with the side of installation portion 19
The L-shaped structure in dress portion 19, point of a knife 21 is provided with the front end of blade body 20, and rear end is provided with cutting edge 22.Bracing wire for convenience,
The front side of cutting edge 22 is provided with bracing wire groove 23.
Two strip gab grooves are provided with installation portion 19 of the present utility model, are provided with and bar in the mounting seat 15 of knife one
The one-to-one mounting hole of shape open slot, knife one is screwed onto in mounting hole by screw to be fixed in the mounting seat 15 of knife one, regulation
The position that position of the screw in strip gab groove can be engaged with fine-adjustment cutter one with knife 24.
The taper internal gear 9 of motion knife rest 2 described in the utility model is motion knife rest 2 when being combined with taper external gear 8
Positioned at anterior station, motion knife rest 2 separates luck movable knife rack 2 positioned at rear portion station with taper external gear 8 after resetting.
Another purpose of the present utility model is to provide a kind of sewing machine, including above-mentioned thread cutting mechanism.
Operation principle of the present utility model：
When need not carry out trimming, after the shift fork 7 of motion knife rest 2 and clutch is located in the presence of back-moving spring 16
Taper internal gear 9 on portion's station motion knife rest 2 is not contacted with taper external gear 8, and taper external gear 8 rotates together with lower axle 1,
Motion knife rest 2 is not driven to rotate together.
When control system receives trimming order, before rotating shuttle goes to trimming angle, control system is sent out to power part
Signal, power part starts, and drives drive shaft 6 anteriorly to move.
When now, from the clutch of shifting fork structure, shift fork 7 drives motion knife rest 2 to be moved to anterior station；
Engaged in taper internal gear 9 with taper external gear 8, taper external gear 8 is with motion knife rest 2 as rotating shuttle turns together
Dynamic, the moving knife 3 on motion knife rest 2 is rotated around lower axle 1 centrally along rotating shuttle direction of rotation, and point of a knife 21 passes through the line of upper thread
Ring, bracing wire groove 23 is with upper thread while with bottom line to stationary knife (knife 2 4) movement, when the cutting edge 22 and stationary knife of the moving knife with line
During the cutting edge occlusion of (knife 2 4), line is cut off, trimming action is completed.
After line is cut off, taper external gear 8 is rotated further with motion knife rest 2, until eedle 24 is stopping the stopping of pin position, is moved
Knife 3 returns to stop position, waits next trimming operation.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Claims (10)
1. a kind of thread cutting mechanism, including lower axle (1), it is characterised in that：Motion knife rest (2) is arranged with outside lower axle (1), in motion
Knife one is provided with knife rest (2), motion knife rest (2) is connected with clutch, clutch makes motion knife by power part driving
Frame (2) is connected or separated with lower axle (1)；During connection, motion knife rest (2) is rotated together with lower axle (1), and knife one is real with knife two (4)
Now rotation trimming action；During separation, lower axle (1) is rotated, and motion knife rest (2) is not rotated；
The clutch includes the drive shaft (6) being arranged on chassis backplane (5) in the mounting hole of relevant position, drive shaft
(6) can be in mounting hole to rotating shuttle direction or away from the movement of rotating shuttle direction, the head of drive shaft (6) is provided with shift fork (7), shift fork
(7) one end is connected with motion knife rest (2), the afterbody connection power part of drive shaft (6), positioned at motion knife rest (2) side
Taper external gear (8) is provided with lower axle (1), the motion knife rest (2) is provided with taper close to one end of taper external gear (8)
Internal gear (9), shift fork (7) promotes motion knife rest (2) to be moved to rotating shuttle direction, makes taper external gear (8) with moving on knife rest (2)
Taper internal gear (9) engagement realize motion knife rest (2) with lower axle (1) synchronous axial system, be provided with reset machine in drive shaft (6)
Structure, and drive shaft (6) is connected with power part.
2. a kind of thread cutting mechanism according to claim 1, it is characterised in that：Lower axle protheca is arranged with outside the lower axle (1)
(10), motion knife rest (2) is set in lower axle protheca (10) outside, and one end of shift fork (7) is set on motion knife rest (2).
3. a kind of thread cutting mechanism according to claim 1, it is characterised in that：Motion is provided with the chassis backplane (5)
Knife rest hole, motion knife rest (2) is arranged on motion knife rest hole and outside the head stretching motion knife rest hole of motion knife rest (2), fortune
The outer wall of movable knife rack (2) is connected with the inwall in motion knife rest hole, and one end of shift fork (7) is connected on the head of motion knife rest (2).
4. a kind of thread cutting mechanism according to claim any one of 1-3, it is characterised in that：The motion knife rest (2) includes
There are tool-post structure one (11) and tool-post structure two (12), tool-post structure one (11), which includes, is set in lower axle (1) or lower axle protheca (10) outside
Main body (13), convex annular is provided with one end of main body (13) along (14), tool-post structure two (12) is arranged and is fixed on tool-post structure
The main body (13) of one (11) outside, is provided with the mounting seat of knife one (15) on tool-post structure two (12), and the taper internal gear (9) is located at
On tool-post structure two (12), the annular groove that tool-post structure two (12) and convex annular are used for installing shift fork (7) along being formed between (14).
5. a kind of thread cutting mechanism according to claim 1, it is characterised in that：The resetting-mechanism is power part, is moved
Power part is connected with the afterbody of drive shaft (6) by joint, drives motion knife rest (2), clutch to reset by power part.
6. a kind of thread cutting mechanism according to claim 1, it is characterised in that：The resetting-mechanism is back-moving spring (16),
The tail end of drive shaft (6) contacts connection with power part, and tail end is provided with catch (17), and one end of back-moving spring (16) is held out against
On catch (17), the other end hold out against on chassis backplane (5), when power part power disappears, by back-moving spring (16) band
Dynamic motion knife rest (2), clutch reset.
7. a kind of thread cutting mechanism according to claim 1, it is characterised in that：The knife one includes and motion knife rest (2)
The installation portion (19) of connection, blade body (20), blade body (20) and installation portion are provided with the side of installation portion (19)
(19) L-shaped structure, point of a knife (21) is provided with the front end of blade body (20), and rear end is provided with cutting edge (22).
8. a kind of thread cutting mechanism according to claim 1, it is characterised in that：The knife two (4) is stationary knife or moving knife.
9. a kind of thread cutting mechanism according to claim 1, it is characterised in that：The motion knife rest (2) is connected with lower axle (1)
When, motion knife rest (2) 360 ° of rotations together with lower axle (1).
10. a kind of sewing machine, it is characterised in that：Including a kind of thread cutting mechanism as described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720088863.8U CN206438278U (en) | 2017-01-20 | 2017-01-20 | A kind of thread cutting mechanism and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720088863.8U CN206438278U (en) | 2017-01-20 | 2017-01-20 | A kind of thread cutting mechanism and sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206438278U true CN206438278U (en) | 2017-08-25 |
Family
ID=59636737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720088863.8U Active CN206438278U (en) | 2017-01-20 | 2017-01-20 | A kind of thread cutting mechanism and sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206438278U (en) |
-
2017
- 2017-01-20 CN CN201720088863.8U patent/CN206438278U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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| CP03 | Change of name, title or address |
Address after: 318000 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. |