CN106894175A - A kind of sewing machine automatic shearing mechanism and sewing machine - Google Patents
A kind of sewing machine automatic shearing mechanism and sewing machine Download PDFInfo
- Publication number
- CN106894175A CN106894175A CN201710215982.XA CN201710215982A CN106894175A CN 106894175 A CN106894175 A CN 106894175A CN 201710215982 A CN201710215982 A CN 201710215982A CN 106894175 A CN106894175 A CN 106894175A
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- China
- Prior art keywords
- trimming
- crank
- sewing machine
- axle
- adjutage
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Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
Abstract
The present invention provides a kind of sewing machine automatic shearing mechanism, including lower axle, it is fixed on the trimming driving cam in lower axle, can be swung around lower axle and with least one moving knife and the moving knife component of a movable knife rack, crank axle, installed in the trimming drive component of crank axle one end, it is fixed on the trimming crank of the crank axle other end, and trimming connecting rod, trimming drive component has the first adjutage, the end of first adjutage is connected with roller, the two ends of trimming connecting rod are hinged with trimming crank and movable knife rack respectively, crank axle and the distance between trimming crank and trimming connecting rod hinge point L1, ratio with lower axle and the distance between movable knife rack and trimming connecting rod hinge point L2 is not less than 2.5, trimming connecting rod is not less than 40 ° to the drive line angle γ of movable knife rack；During trimming, the trimming contact surface of roller and trimming driving cam periphery is engaged.The application simplifies the structure and driving-chain of sewing machine automatic shearing mechanism, reduces the quantity of complex parts in original mechanism, advantageously reduces cost and reduces assembly work.
Description
Technical field
The present invention relates to a kind of sewing device, more particularly to a kind of sewing machine automatic shearing mechanism and sewing machine.
Background technology
At present, be configured with automatic shearing mechanism on sewing machine (particularly flat seam machine), for every time sewing terminate after
Bottom line and upper thread are cut at rotating shuttle.As shown in figure 1, under automatic shearing mechanism generally comprises rotatably in existing sewing machine
Axle 100, the cam 200 being fixed in lower axle 100 shear spool 300 parallel with lower axle 100, swingable trimming crank group
Part 400, the disk 500 positioned at the end of shear spool 300, trimming crank 600, the trimming company for being installed in the other end of shear spool 300
Bar 700, movable knife rack 800, the moving knife 900 being fixed on movable knife rack 800 and the stationary knife being fixed on baseplate of sewing machine lower surface
110, wherein, trimming crank assemblies 400 have the first adjutage 401, the second adjutage 402 and the 3rd adjutage 403, and first prolongs
Semi-girder 401 is used for and cam engagement, realizes power transmission, and the second adjutage 402 is used for and cam engagement, realizes forced resetting,
Sliding block, the circumferential slot for the end disk 500 of shear spool 300 are installed on the 3rd adjutage 403 to be engaged, realize that moment of torsion is passed
Pass.Therefore, the operation principle of above-mentioned automatic shearing mechanism is：As depicted in figs. 1 and 2, it is necessary to during trimming, lower axle 100 drives convex
200 synchronous axial systems are taken turns, drives trimming crank assemblies 400 to swing with the matching relationship of cam 200 by the first adjutage 401, then
Shear spool 300 is driven to swing with the matching relationship of disk 500 by the 3rd adjutage 403；Finally, shear spool 300 is driven to drive
The synchronous hunting of trimming crank 600, trimming crank 600 drives movable knife rack 800 and moving knife 900 to swing by trimming connecting rod 700, makes
Knife 900 is mutually engaged with stationary knife 110 and cuts bottom line and upper thread, realizes automatic shearing.
In addition, in sewing machine normal work, the first adjutage 401 on trimming crank assemblies 400 need to be away from cam
200, therefore trimming crank assemblies 400 can be moved along the axial reciprocating of shear spool 300, so that the 3rd adjutage 403 and trimming
Also need to set sliding pair between the disk 500 of axle 300.Therefore, in above-mentioned sewing machine automatic shearing mechanism, trimming crank assemblies bag
Containing three adjutages, and it is coordinated between shear spool by sliding pair so that automatic shearing mechanism complicated integral structure, to zero
The requirement on machining accuracy of part is higher, high processing costs, and because number of parts is more, assembling inconvenience, man-hour is long.
Further, in the existing automatic shearing mechanism shown in Fig. 1 and Fig. 2, by trimming crank, trimming connecting rod and moving knife
In the trimming executing agency ABCD that frame is constituted, bar between bar AB (as part trimming crank) and bar CD (as part movable knife rack)
Ratio long is：AB/CD ≈ 1.2, bar EF (as the 3rd adjutage), the pivot angle ratio of bar AB and bar CD during trimming
For：ΦAB：Φ CD=1：2.58：3.33, it is clear that the pivot angle of bar bar EF is by trimming crank assemblies and trimming executing agency ABCD
After two grades are amplified, the large-angle slewing motion of moving knife is finally realized, so as to cause automatic shearing mechanism driving-chain redundancy, structure
It is complicated.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of sewing machine automatic thread trimmer
Structure, it simplifies driving-chain, reduces cost, and reduces assembling duration.
To achieve the above object, the present invention provides a kind of sewing machine automatic shearing mechanism, including rotatable support in sewing
Lower axle in machine bottom board, the trimming driving cam being fixed in lower axle, the moving knife component that can be swung around lower axle, the moving knife component
Including at least one movable knife rack moving knife and for installing the moving knife, also including the crank axle parallel with lower axle, install
Trimming drive component in crank axle one end, the trimming crank and trimming connecting rod that are fixed on the crank axle other end, the trimming
Drive component has the first adjutage, and the end of first adjutage is connected with roller, the two ends of the trimming connecting rod respectively with
Trimming crank and movable knife rack are hinged, the crank axle and the distance between trimming crank and trimming connecting rod hinge point L1, same to lower axle
Ratio with the distance between movable knife rack and trimming connecting rod hinge point L2 is not less than 2.5；During trimming, the roller and trimming drive
The trimming contact surface of cam periphery is engaged, the trimming drive component, crank axle and trimming crank synchronous hunting, the trimming
Connecting rod is not less than 40 ° to the drive line angle γ of movable knife rack.
Further, the trimming drive component has the second adjutage, the first adjutage and the second adjutage difference position
At the two ends of trimming drive component, the end of second adjutage is connected with forced resetting pin, is fixed with the lower axle
Forced resetting driving cam；When roller crosses the end of trimming section on trimming contact surface, the forced resetting pin neighbour is in strong
The forced resetting contact surface of reset drives cam periphery processed.
Further, also including power source, the power source is connected by transmission mechanism with trimming drive component；Trimming
When, power source action drives trimming drive component along the axial movement of crank axle by transmission mechanism, make the roller with
Trimming contact surface is engaged, and makes the forced resetting pins position in the outer circumferential side of forced resetting contact surface.
Preferably, the power source be electromagnet, with the mandrel parallel to lower axle, the transmission mechanism include push rod and
Contiguous block, the end of the mandrel is fixed in contiguous block, and one end of the push rod is fixed in contiguous block, the other end of push rod
End face with trimming drive component is abutted against.
Further, the trimming drive component has the driving body being located between the first adjutage and the second adjutage
Portion, is offered along the axially extending chute of crank axle on the driving body, and the crank axle is located in driving body,
And spacer pin is fixed with crank axle, the spacer pin is located in the chute for driving body and can be past along the bearing of trend of chute
Polyslip.
Preferably, it is cased with back-moving spring on the crank axle and is fixed with positioned at back-up ring, the back-up ring is located at trimming crank
And second between adjutage, the two ends of the back-moving spring abut against with the second adjutage and back-up ring respectively.
Preferably, be cased with reduction torsion spring on the crank axle, the two ends of the reduction torsion spring respectively with trimming crank and sewing
Machine bottom board is abutted against.
Further, the trimming crank include separate crank portion and link rod part, one end of the crank portion with
Crank axle is mutually fixed, and the other end of crank portion is mutually fixed with one end of link rod part, the other end of link rod part and the trimming connecting rod
It is hinged.
Preferably, the lower surface of the baseplate of sewing machine is provided with confined planes, end face of the crank portion towards confined planes
On offer accepting hole, built-in limited location pad in the accepting hole, it is described it is spacing pad be engaged with confined planes.
Further, also including being fixed on the stationary knife of baseplate of sewing machine, the moving knife has one, and the movable knife rack has one
It is individual；During trimming, moving knife and stationary knife are engaged.
The application also provides a kind of sewing machine, including baseplate of sewing machine and sewing machine automatic shearing mechanism as described above,
The lower axle and movable knife rack are all installed in rotation in baseplate of sewing machine.
As described above, sewing machine automatic shearing mechanism of the present invention and sewing machine, have the advantages that：
The application simplifies the structure and driving-chain of sewing machine automatic shearing mechanism, reduces the number of complex parts in original mechanism
Amount, advantageously reduces cost, improves efficiency of assembling and reduces assembly work.
Brief description of the drawings
Fig. 1 is the structural representation of sewing machine automatic shearing mechanism in the prior art.
Fig. 2 is the schematic diagram of Fig. 1.
Fig. 3 is the structural representation of sewing machine automatic shearing mechanism in the application.
Fig. 4 and Fig. 5 is the structural representation after omission baseplate of sewing machine in Fig. 3.
Fig. 6 is the connection diagram in Fig. 3 between trimming crank and baseplate of sewing machine.
Fig. 7 is the structural representation of trimming drive component in Fig. 3.
Fig. 8 is the structural representation of Fig. 3 cams.
Fig. 9 and Figure 10 is the schematic diagram of sewing machine automatic shearing mechanism in the application, wherein, Fig. 9 is trimming state, Figure 10
It is reset state.
Component label instructions
1 baseplate of sewing machine
101 confined planes
2 lower axles
3 driving cams
31 trimming driving cams
32 trimming contact surfaces
33 forced resetting driving cams
34 forced resetting contact surfaces
35 connectors
4 movable knife racks
5 moving knife
6 stationary knifes
7 crank axles
8 trimming drive components
81 first adjutages
82 rollers
83 second adjutages
84 forced resetting pins
85 drive body
86 chutes
87 spacer pins
88 roller shafts
9 trimming cranks
91 crank portions
92 link rod parts
10 trimming connecting rods
11 power sources
12 push rods
13 contiguous blocks
14 back-moving springs
15 back-up rings
16 reduction torsion springs
17 spacing pads
18 fixed mounts
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages of the invention and effect easily.
It should be clear that this specification accompanying drawing structure, ratio, size for being painted etc., are only used to coordinate interior disclosed in specification
Hold, so that those skilled in the art understands and reads, be not limited to enforceable qualifications of the invention, therefore do not have skill
Essential meaning in art, the modification of any structure, the change of proportionate relationship or the adjustment of size can be produced the present invention is not influenceed
Under raw effect and the purpose to be reached, all should still fall in the range of disclosed technology contents can be covered.Together
When, in this specification it is cited such as " on ", D score, "left", "right", the term of " centre " and " ", be merely convenient to chat
State clearly, and be not used to limit enforceable scope of the invention, being altered or modified for its relativeness is changing technology without essence
Inside hold, when being also considered as enforceable category of the invention.
The application provides a kind of sewing machine automatic shearing mechanism, in sewing machine, particularly flat seam machine, for every
Secondary sewing cuts bottom line and upper thread after terminating；For ease of description, by sewing machine, in sewing, the moving direction of cloth is defined as
Front direction, therefore the bearing of trend of lower axle 2 is left and right directions in sewing machine, and lower axle 2 is left end, lower axle 2 near one end of head
It is right-hand member near one end of tail.As shown in Figures 3 to 5, the sewing machine automatic shearing mechanism includes rotatable support in seam
Thread the lower axle 2 in machine bottom board 1, be fixed in lower axle 2 trimming driving cam 31, in baseplate of sewing machine 1 and can be under
It is the moving knife component crank axle 7 parallel with lower axle 2 that axle 2 swings, the trimming drive component 8 installed in the right-hand member of crank axle 7, solid
Be scheduled on the trimming crank 9 and trimming connecting rod 10 of the left end of crank axle 7, the moving knife component include at least one moving knife 5 and
Movable knife rack 4 for installing the moving knife 5, therefore the quantity of movable knife rack 4 is equal with the quantity of moving knife 5, movable knife rack 4 is arranged on sewing
Can swing in machine bottom board and around lower axle 2, the outer peripheral face of the trimming driving cam 31 is trimming contact surface 32, and the trimming drives
The right-hand member of component 8 has the first adjutage 81, and first adjutage 81 is connected with away from the end of crank axle 7 and protrude to the left the
The roller 82 of the left side of one adjutage 81, the two ends of the trimming connecting rod 10 are respectively with trimming crank 9 and movable knife rack 4 by left and right
The axial screw of extension is hinged, and the crank axle 7 is L1 with the distance between trimming crank 9 and the pin joint of trimming connecting rod 10,
The lower axle 2 is L2 with the distance between movable knife rack 4 and the pin joint of trimming connecting rod 10, L1 and L2 ratios L1/L2 is not less than 2.5；
During trimming, the trimming contact surface 32 of the roller 82 and the periphery of trimming driving cam 31 is engaged, the trimming drive component 8,
Crank axle 7 and the synchronous hunting of trimming crank 9, the trimming connecting rod 10 are not less than 40 ° to the drive line angle γ of movable knife rack 4.
Further, the sewing machine can be single action knife structure, or double acting knife structure.When sewing machine is using single
During the structure of moving knife, the sewing machine automatic shearing mechanism also includes the stationary knife 6 being fixed on the lower surface of baseplate of sewing machine 1, institute
It is one to state moving knife 5, and movable knife rack 4 is one；During trimming, moving knife 5 is engaged with stationary knife 6.When sewing machine is using the structure of double acting knife
When, the moving knife 5 is two, and movable knife rack 4 is two, and two moving knife 5 are individually fixed on a movable knife rack 4, such as；Application number
Short-term head double shear mechanism or Application No. disclosed in 201610473636.7 Chinese invention application specification
The thread cutting mechanism of the sewing machine disclosed in 201610494020.8 Chinese invention application specification；Now, two movable knife racks 4 can
The trimming crank 9 by being fixed on crank axle 7 drives swing respectively, therefore trimming crank 9 also has two；During trimming, two moving knife 5
Mutually it is engaged.Following examples launch narration all by taking the sewing machine automatic shearing mechanism of single action knife structure as an example.
The schematic diagram of the sewing machine automatic shearing mechanism of single action knife structure as shown in Figure 9 and Figure 10, in Fig. 9 or Figure 10, A pairs
Crank axle 7 is should be, G corresponds to roller 82, and D corresponds to lower axle 2, and AG corresponds to the first adjutage 81, and AB corresponds to trimming crank
9, BC correspond to trimming connecting rod 10, and CDE corresponds to movable knife rack 4, and trimming crank 9, trimming connecting rod 10 and movable knife rack 4 constitute four bar machines
Structure ABCD, for performing trimming, therefore, B is the pin joint of trimming crank 9 and trimming connecting rod 10, C be trimming connecting rod 10 with it is dynamic
The pin joint of knife rest 4, therefore crank axle 7 described above is with the distance between trimming crank 9 and the pin joint of trimming connecting rod 10 L1
It is the length of bar AB in Fig. 9 or Figure 10, lower axle 2 described above and the distance between movable knife rack 4 and the pin joint of trimming connecting rod 10
L2 is the length of bar CD in Fig. 9 or Figure 10, trimming connecting rod 10 described above the drive line angle γ of movable knife rack 4 is Fig. 9 or
Bar BC is to the drive line angle of bar CD in Figure 10, it can thus be appreciated that：In the schematic diagram of sewing machine automatic shearing mechanism, both bar AB and bar CD
Between bar it is long be not less than 2.5 than AB/CD, bar BC is not less than 40 ° to the drive line angle γ of bar CD, so as to four-bar mechanism ABCD's
Parameter is optimized, and is the large angle pendulum for being capable of achieving bar CD by primary transmission, and then simplify sewing machine automatic shearing mechanism
Driving-chain.
In the present embodiment, the trimming contact surface 32 of the periphery of trimming driving cam 31 include it is the first be sequentially connected wait cut
Line segment, trimming section and reset section.In normal sewing, trimming drive component 8 is in initial position, and now, roller 82 is not disposed in
Without matching relationship between the outer circumferential side of trimming driving cam 31, with trimming contact surface 32；After sewing terminates, trimming drive component 8
Moved near the direction of trimming driving cam 31, drive the first adjutage 81 and roller 82 synchronously to convex near trimming driving
Wheel 31 direction movement, make roller 82 be located at trimming driving cam 31 outer circumferential side and with trimming contact surface 32 treat trimming section
It is in contact；Now, as shown in Fig. 4, Fig. 5 and Fig. 9, lower axle 2 drives the synchronous axial system of trimming driving cam 31, is driven by trimming convex
The trimming section of trimming contact surface 32 drives trimming drive component 8, crank axle 7 and trimming crank with the matching relationship of roller 82 on wheel 31
9 three's synchronous huntings, trimming crank 9 directly drives movable knife rack 4 and moving knife 5 to be swung around lower axle 2 by trimming connecting rod 10, by one
The large angle pendulum of moving knife 5 is realized in level transmission, moving knife 5 is mutually engaged with stationary knife 6 to the rotation near the direction of stationary knife 6, Jin Er
Bottom line and upper thread are cut at rotating shuttle, completes automatic shearing.Compared with prior art, the application greatly simplifies sewing machine automatic shearing
The driving-chain of line mechanism, simplifies the structure of sewing machine automatic shearing mechanism, cancels baroque part in the prior art, reduces
The quantity of complex parts in original mechanism, namely the processing technology requirement of each part in sewing machine automatic shearing mechanism is reduced,
So as to advantageously reduce cost, improve efficiency of assembling, the overall processing for reducing assembly work, reducing sewing machine automatic shearing mechanism
Cost, and then reduce the production cost of whole sewing machine.
The roller 82 can be fixed state, or the state of rolling, and the present embodiment is preferably using rolling
Son 82 is the state for rolling, it is possible to decrease frictional force when roller 82 coordinates with trimming contact surface 32 between the two；Now, such as Fig. 7
Shown, the end of the first adjutage 81 of the trimming drive component 8 is fixed with the roller shaft 88 of one or so extension, the roller
82 are rotationally enclosed within roller shaft 88 and positioned at the left side of the first adjutage 81.
Preferably, as shown in Figure 4 and Figure 5, reduction torsion spring 16 is cased with the crank axle 7, the two ends of the reduction torsion spring 16
Abutted against with trimming crank 9 and baseplate of sewing machine 1 respectively；Had no progeny when by suture scissors, answering on roller 82 and trimming contact surface 32
Position section be engaged, trimming crank 9 resets in the presence of reduction torsion spring 16, by trimming connecting rod 10 drive movable knife rack 4, moving knife 5,
Crank axle 7 and trimming drive component 8 reset.
Further, as shown in Fig. 4 and Fig. 5, Fig. 7, Fig. 9 and Figure 10, the left end of the trimming drive component 8 has second
Adjutage 83, second adjutage 83 is connected with forced resetting pin 84 away from the end of crank axle 7, the forced resetting pin 84 to
The right side protrudes from the right side of the second adjutage 83, and forced resetting driving cam 33 is fixed with the lower axle 2, and the forced resetting drives
The outer peripheral face of moving cam 33 is forced resetting contact surface 34.During trimming, when trimming drive component 8 is near trimming driving cam 31
Direction move when, trimming drive component 8 can also drive the second adjutage 83 and forced resetting pin 84 synchronously near pressure
The direction movement of reset drives cam 33, makes forced resetting pin 84 be located at the outer circumferential side of forced resetting contact surface 34；When the He of moving knife 5
When stationary knife 6 is mutually engaged, cuts suture, also as roller 82 crosses the tie point of trimming section and reset section on trimming contact surface 32
When, the neighbour of forced resetting pin 84 is in forced resetting contact surface 34.Under normal circumstances, trimming crank 9, movable knife rack 4, moving knife 5, crank
Axle 7 and trimming drive component 8 are realized automatically reseting by the reduction torsion spring 16 being enclosed within crank axle 7, therefore trimming drive component 8 is same
When also drive the second adjutage 83 and forced resetting pin 84 to reset, after reset, forced resetting pin 84 and forced resetting driving cam
Gap between 33 becomes big, is insufficient to allow forced resetting pin 84 to be engaged with forced resetting contact surface 34, therefore by resetting
In the case that torsion spring 16 realizes normal reset, forced resetting pin 84 does not work.But, because card line or other reasonses cause again
When position torsion spring 16 can not make moving knife 5 and stationary knife 6 be separated, then movable knife rack 4, trimming crank 9, crank axle 7, trimming drive component 8
With forced resetting pin 84 all without normal reset, now, the still neighbour of forced resetting pin 84 in forced resetting contact surface 34, therefore under
When axle 2 drives forced resetting 33 synchronous axial system of driving cam, by the matching of forced resetting pin 84 and forced resetting contact surface 34
Close and drive forced resetting pin 84 and the second adjutage 83 to act, and then cause that trimming drive component 8 resets, so as to drive crank axle
7th, trimming crank 9, movable knife rack 4 and the forced resetting of moving knife 5, force moving knife 5 to be separated with stationary knife 6, it is ensured that automatic shearing next time
Can be normally carried out.
Preferably, as shown in figure 8, the trimming driving cam 31 and forced resetting driving cam 33 pass through the phase of connector 35
, respectively positioned at the right side and left side of connector 35, trimming drives for connection, trimming driving cam 31 and forced resetting driving cam 33
Cam 31, connector 35 and forced resetting driving cam 33 are processed into a single piece, and the single piece is defined as into driving cam 3.
In driving cam 3, connector 35 is fixed on lower axle 2 by multiple screws being radially arranged along lower axle 2, and then by driving cam 3
Overall fixed and lower axle 2, is conducive to save space, is easy to assembling.
In the present embodiment, the trimming drive component 8 can be moved along the axial linear reciprocation of crank axle 7, so that roller 82
Be engaged with trimming contact surface 32 or separated and make forced resetting pin 84 and forced resetting contact surface 34 close or remote from.This
When, as shown in Figure 4 and Figure 5, sewing machine automatic shearing mechanism also includes power source 11, and the power source 11 passes through transmission mechanism and cuts
Line drive component 8 is connected；During trimming, power source 11 is acted, and trimming drive component 8 is driven along crank axle 7 by transmission mechanism
Axial direction be moved to the left, the roller 82 is engaged with trimming contact surface 32, and make the forced resetting pin 84 be located at force
The outer circumferential side of reset contact surface 34.Back-moving spring 14 is also cased with the crank axle 7 and is fixed with positioned at back-up ring 15, the gear
Circle 15 is located between the adjutage 83 of trimming crank 9 and second, the two ends of the back-moving spring 14 respectively with the second adjutage 83 and
Back-up ring 15 is abutted against；After trimming terminates, power source 11 resets, and the second adjutage 83 is moved right by the elastic force of back-moving spring 14
It is dynamic, and then drive trimming drive component 8 move right, reset.
Preferably, the power source 11 be electromagnet, with the mandrel parallel to lower axle 2, electromagnet passes through fixed mount 18
On the lower surface of baseplate of sewing machine 1, the transmission mechanism includes push rod 12 and contiguous block 13, and the left end of the mandrel is consolidated
It is scheduled in contiguous block 13, the right-hand member of the push rod 12 is fixed in contiguous block 13, left end and the trimming drive component 8 of push rod 12
The right side of the first adjutage 81 abuts against.During trimming, electromagnet is powered, and the iron core of electromagnet is electric to being close under magneticaction
The ferromagnetic direction of magnetic is retracted to the left, therefore the mandrel of electromagnet stretches out to the left, drives contiguous block 13 and push rod 12 synchronously to the left
It is mobile, and then promote trimming drive component 8 to be moved to the left.For guiding when realizing that trimming drive component 8 is moved left and right and
The transmission of moment of torsion between trimming drive component 8 and crank axle 7, as shown in figure 5 and figure 7, the trimming drive component 8 have be located at
Driving body 85 between first adjutage 81 and the second adjutage 83, drives and offered along crank axle 7 on body 85
Axially extending chute 86, the crank axle 7 is located in driving body 85, and fixes limited on the outer peripheral face of crank axle 7
Position pin 87, the spacer pin 87 is located in the chute 86 for driving body 85 and can be along the bearing of trend of chute 86 toward polyslip.
Simplify design of part, reduces cost in order to further, as shown in Figure 5 and Figure 6, trimming crank 9 is resolved into mutually
Independent two splits：Split one, crank portion 91；Split two, link rod part 92.Wherein, one end of crank portion 91 is mutually solid with crank axle 7
Fixed, the other end of crank portion 91 is mutually fixed by two screws with one end of link rod part 92, is assembled into trimming crank 9, link rod part
92 other end is hinged with the trimming connecting rod 10.After by the split of trimming crank 9, its crank portion 91 and link rod part 92 can be simplified
Structure, reduce cost of parts.As shown in fig. 6, the lower surface of the baseplate of sewing machine 1 is provided with confined planes 101, the trimming
The crank portion 91 of crank 9 is built-in with what is be made up of rubber towards accepting hole is offered on the end face of confined planes 101 in the accepting hole
Spacing pad 17, the spacing pad 17 is engaged with confined planes 101, and the initial position of movable knife rack 4 and moving knife 5 is limited with this.
The operation principle of above-mentioned sewing machine automatic shearing mechanism is as follows：Under original state, electromagnet power-off, the iron of electromagnet
Core is the state stretched out to the right, and trimming drive component 8 is located at the right side of driving cam 3, roller 82 and the phase of trimming contact surface 32 point
From moving knife 5 is separated with stationary knife 6.During trimming, electromagnet is powered, and mandrel is moved to the left, and is promoted by fixed block and push rod 12 and cut
Line drive component 8 overcomes the pressure of back-moving spring 14 to be moved to the left, and back-moving spring 14 is compressed, and it is convex that roller 82 is located at trimming driving
Wheel 31 outer circumferential side and with trimming contact surface 32 treat trimming section be in contact；Lower axle 2 drives the synchronous axial system of driving cam 3, makes rolling
Son 82 is engaged with the trimming section of trimming contact surface 32, so as to drive trimming drive component 8 to swing, trimming drive component 8 passes through
Spacer pin 87 drives crank axle 7 and the synchronous hunting of trimming crank 9, trimming crank 9 to impart power to move by trimming connecting rod 10
Knife rest 4, it is final to drive movable knife rack 4 and moving knife 5 to be swung near the direction of stationary knife 6 around lower axle 2, until bottom line and upper thread are cut
It is disconnected.Lower axle 2 drives driving cam 3 to continue synchronous axial system, roller 82 is engaged with the reset section of trimming contact surface 32, resets and turns round
Spring 16 makes trimming crank 9, movable knife rack 4, moving knife 5, crank axle 7, trimming drive component 8 reset, until spacing on trimming crank 9
Pad 17 leans on jail with the confined planes 101 on baseplate of sewing machine 1.After trimming terminates, electromagnet power-off, mandrel moves right reset,
Cause that trimming drive component 8 resets in the presence of the elastic force of back-moving spring 14, roller 82 is separated with trimming contact surface 32.So far,
Complete a trimming circulation.
The application also provides a kind of sewing machine, including baseplate of sewing machine 1 and sewing machine automatic shearing mechanism as described above,
The lower axle 2 and movable knife rack 4 are all installed in rotation in baseplate of sewing machine 1.
In sum, the application is optimized to the sewing machine automatic shearing mechanism in sewing machine, particularly to sewing
The parameter of the screw body ABCD in machine automatic shearing mechanism for performing trimming optimizes design, simplifies driving-chain, is easy to
Assembling, reduces assembly work；Meanwhile, the application also cancels the structures such as shear spool, sliding block, the sliding pair in original mechanism, all adopts
Coordinated with lower-cost pin type, therefore reduce the quantity of complex parts in sewing machine automatic shearing mechanism, production cost is big
It is big to reduce.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (11)
1. a kind of lower axle (2) of the sewing machine automatic shearing mechanism, including rotatable support in baseplate of sewing machine (1), it is fixed on
Trimming driving cam (31) in lower axle (2) and the moving knife component that can be swung around lower axle (2), the moving knife component are included extremely
A few movable knife rack (4) moving knife (5) and for installing the moving knife (5), it is characterised in that：Also include and lower axle (2) phase
Parallel crank axle (7), the trimming drive component (8) installed in crank axle (7) one end, it is fixed on crank axle (7) other end
Trimming crank (9) and trimming connecting rod (10), the trimming drive component (8) with the first adjutage (81), this first extend
The end of arm (81) is connected with roller (82), the two ends of the trimming connecting rod (10) respectively with trimming crank (9) and movable knife rack (4)
It is hinged, the crank axle (7) and the distance between trimming crank (9) and trimming connecting rod (10) pin joint L1, same to lower axle (2) and moves
The ratio of the distance between knife rest (4) and trimming connecting rod (10) pin joint L2 is not less than 2.5；During trimming, the roller (82) and
The trimming contact surface (32) of trimming driving cam (31) periphery is engaged, and the trimming drive component (8), crank axle (7) and cuts
Line crank (9) synchronous hunting, the trimming connecting rod (10) is not less than 40 ° to the drive line angle γ of movable knife rack (4).
2. sewing machine automatic shearing mechanism according to claim 1, it is characterised in that：Trimming drive component (8) tool
There is the second adjutage (83), the first adjutage (81) and the second adjutage (83) are respectively positioned at the two ends of trimming drive component (8)
Place, the end of second adjutage (83) is connected with forced resetting pin (84), and forced resetting drive is fixed with the lower axle (2)
Moving cam (33)；When roller (82) crosses the end of trimming section on trimming contact surface (32), the forced resetting pin (84) is near
Adjacent to the forced resetting contact surface (34) of forced resetting driving cam (33) periphery.
3. sewing machine automatic shearing mechanism according to claim 2, it is characterised in that：Also include power source (11), this is moved
Power source (11) is connected by transmission mechanism with trimming drive component (8)；During trimming, power source (11) action, by passing
Motivation structure drives trimming drive component (8) along the axial movement of crank axle (7), makes the roller (82) and trimming contact surface (32)
It is engaged, and makes the forced resetting pin (84) positioned at the outer circumferential side of forced resetting contact surface (34).
4. sewing machine automatic shearing mechanism according to claim 3, it is characterised in that：The power source (11) is electromagnetism
Iron, with the mandrel parallel to lower axle (2), the transmission mechanism includes push rod (12) and contiguous block (13), the end of the mandrel
Portion is fixed in contiguous block (13), and one end of the push rod (12) is fixed in contiguous block (13), the other end of push rod (12) with
The end face of trimming drive component (8) is abutted against.
5. sewing machine automatic shearing mechanism according to claim 2, it is characterised in that：Trimming drive component (8) tool
There is the driving body (85) between the first adjutage (81) and the second adjutage (83), opened on the driving body (85)
It is provided with along the axially extending chute (86) of crank axle (7), the crank axle (7) is located in driving body (85), and it is bent
Spacer pin (87) is fixed with arbor (7), the spacer pin (87) positioned at drive body (85) chute (86) in and can be along cunning
The bearing of trend of groove (86) is toward polyslip.
6. sewing machine automatic shearing mechanism according to claim 2, it is characterised in that：It is cased with the crank axle (7) multiple
Position spring (14) is simultaneously fixed with positioned at back-up ring (15), the back-up ring (15) positioned at trimming crank (9) and the second adjutage (83) it
Between, the two ends of the back-moving spring (14) abut against with the second adjutage (83) and back-up ring (15) respectively.
7. sewing machine automatic shearing mechanism according to claim 1, it is characterised in that：It is cased with the crank axle (7) multiple
Position torsion spring (16), the two ends of the reduction torsion spring (16) abut against with trimming crank (9) and baseplate of sewing machine (1) respectively.
8. sewing machine automatic shearing mechanism according to claim 1, it is characterised in that：The trimming crank (9) is including phase
Mutual independent crank portion (91) and link rod part (92), one end and the crank axle (7) of the crank portion (91) are mutually fixed, crank portion
(91) the other end is mutually fixed with the one end of link rod part (92), and the other end of link rod part (92) mutually cuts with scissors with the trimming connecting rod (10)
Connect.
9. sewing machine automatic shearing mechanism according to claim 8, it is characterised in that：Under the baseplate of sewing machine (1)
End face is provided with confined planes (101), the crank portion (91) towards offering accepting hole on the end face of confined planes (101), the receipts
Hold built-in limited location pad (17) in hole, the spacing pad (17) is engaged with confined planes (101).
10. sewing machine automatic shearing mechanism according to claim 1, it is characterised in that：Also include being fixed on sewing machine bottom
The stationary knife (6) of plate (1), the moving knife (5) has one, and the movable knife rack (4) has one；During trimming, moving knife (5) and stationary knife (6)
Occlusion.
A kind of 11. sewing machines, including baseplate of sewing machine (1), it is characterised in that：Also include as described in claim any one of 1-10
Sewing machine automatic shearing mechanism, the lower axle (2) and movable knife rack (4) are all installed in rotation in baseplate of sewing machine (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710215982.XA CN106894175B (en) | 2017-04-01 | 2017-04-01 | automatic thread trimming mechanism of sewing machine and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710215982.XA CN106894175B (en) | 2017-04-01 | 2017-04-01 | automatic thread trimming mechanism of sewing machine and sewing machine |
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| Publication Number | Publication Date |
|---|---|
| CN106894175A true CN106894175A (en) | 2017-06-27 |
| CN106894175B CN106894175B (en) | 2020-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710215982.XA Active CN106894175B (en) | 2017-04-01 | 2017-04-01 | automatic thread trimming mechanism of sewing machine and sewing machine |
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| Country | Link |
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| CN (1) | CN106894175B (en) |
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| 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 |
| CN108385293A (en) * | 2018-03-21 | 2018-08-10 | 杰克缝纫机股份有限公司 | Trimming drive component, thread cutting mechanism and 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 |
| CN113026222A (en) * | 2021-03-24 | 2021-06-25 | 浙江沪龙科技股份有限公司 | Sewing machine |
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| US6694903B1 (en) * | 2002-12-16 | 2004-02-24 | Ching Chi Machine Co., Ltd. | Knife track adjustment structure of thread cutter of sewing machine |
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| 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 |
| CN108385293A (en) * | 2018-03-21 | 2018-08-10 | 杰克缝纫机股份有限公司 | Trimming drive component, thread cutting mechanism and 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 | Publication date |
|---|---|
| CN106894175B (en) | 2020-01-31 |
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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. |