CN106868735A - A kind of automatic shearing mechanism and sewing machine - Google Patents
A kind of automatic shearing mechanism and sewing machine Download PDFInfo
- Publication number
- CN106868735A CN106868735A CN201710212222.3A CN201710212222A CN106868735A CN 106868735 A CN106868735 A CN 106868735A CN 201710212222 A CN201710212222 A CN 201710212222A CN 106868735 A CN106868735 A CN 106868735A
- Authority
- CN
- China
- Prior art keywords
- trimming
- crank
- cam
- automatic shearing
- shear spool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2207/00—Use of special elements
- D05D2207/05—Magnetic devices
Abstract
The present invention provides a kind of automatic shearing mechanism, lower axle including rotatable support in baseplate of sewing machine, the trimming driving cam being fixed in lower axle, the moving knife component that can be swung around lower axle, the moving knife component has at least one moving knife, also include the shear spool parallel with lower axle, the trimming cam crank installed in one end of shear spool and be fixed on the trimming crank of the shear spool other end, ball is connected with the trimming cam crank, the trimming crank is connected by drive mechanism with moving knife component；During trimming, the trimming cam contour surface of the ball and trimming driving cam periphery is engaged, the trimming cam crank, shear spool and trimming crank synchronous hunting.The application simplifies the structure of automatic shearing mechanism, by primary transmission moving knife can be driven to be swung around lower axle and is engaged with stationary knife, realize automatic shearing, and compared with prior art, the application simplifies the driving-chain of automatic shearing mechanism, so that reduces cost.
Description
Technical field
The present invention relates to a kind of garment sewing equipment, more particularly to a kind of automatic shearing mechanism and automatic with this
The sewing machine of thread cutting mechanism.
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 depicted in figs. 1 and 2, automatic shearing mechanism generally comprises and can turn in existing sewing machine
Dynamic lower axle 100, the cam 200 being fixed in lower axle 100 the trimming power transmission shaft 300 parallel with lower axle 100, it is fixed on and cuts
Trimming drive component 400 on line power transmission shaft 300 is parallel with lower axle 100 and one end has the trimming cam in driving crank portion
It is crank axle 500, the trimming crank 600 for being fixed on the other end of trimming cam crank axle 500, trimming connecting rod 700, movable knife rack 800, solid
The moving knife 900 being scheduled on movable knife rack 800 and the stationary knife 110 being fixed on baseplate of sewing machine lower surface, wherein, trimming drives
There is the ball being engaged with cam 200 and the drive division being hinged with driving crank portion, trimming connecting rod 700 on component 400
Two ends be hinged with trimming crank 600 and movable knife rack 800 respectively.Therefore, the operation principle of above-mentioned automatic shearing mechanism is：Such as
, it is necessary to during trimming, ball is engaged with cam 200 shown in Fig. 1 to Fig. 3, lower axle 100 with the synchronous axial system of moving cam 200, by rolling
Pearl drives trimming drive component 400 and trimming power transmission shaft 300 to swing with the matching relationship of cam 200, and it is primary transmission；Lead to again
Cross trimming drive component 400 and drive driving crank portion, trimming cam crank axle 500 and trimming with the hinged relationship in driving crank portion
Crank 600 swings, and it is secondary transmission；Finally, trimming crank 600 drives movable knife rack 800 and moving knife by trimming connecting rod 700
900 swing, and moving knife 900 is mutually engaged with stationary knife 110 and cut bottom line and upper thread, realize automatic shearing.It is above-mentioned existing automatic
Thread cutting mechanism driving-chain redundancy, complex structure, and trimming drive component are complicated with trimming cam crank axle part, processing cost
It is high.
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 automatic shearing mechanism, its letter
Change driving-chain, simplify the structure of automatic shearing mechanism.
To achieve the above object, the present invention provides a kind of automatic shearing mechanism, including rotatable support is in baseplate of sewing machine
In lower axle, be fixed in lower axle trimming driving cam, can around lower axle swing moving knife component, moving knife component have at least one
Moving knife, also including the shear spool parallel with lower axle, the trimming cam crank installed in shear spool one end and is fixed on trimming
The trimming crank of the axle other end, is connected with ball on the trimming cam crank, the trimming crank passes through drive mechanism and moves
Knife assembly is connected；During trimming, the trimming cam contour surface of the ball and trimming driving cam periphery is engaged, the trimming
Cam crank, shear spool and trimming crank synchronous hunting.
Further, also including the reseting plate mutually fixed with trimming cam crank, the reseting plate is bent away from trimming cam
One end of handle is provided with forced resetting portion and holds the through hole that shear spool is passed through, and forced resetting driving cam is fixed with the lower axle；
When the end of trimming section on ball moving to trimming cam contour surface, the forced resetting portion neighbour drives convex in forced resetting
Take turns the forced resetting cam contour surface of periphery.
Further, also including power source, the power source is connected by transmission mechanism with trimming cam crank；Trimming
When, power source action drives trimming cam crank along the axial movement of shear spool by transmission mechanism, make the ball with
Trimming cam contour surface is engaged, and the forced resetting portion is located at the outer circumferential side of forced resetting cam contour surface.
Preferably, the power source be electromagnet, with the mandrel parallel to lower axle, the transmission mechanism include push rod and
Ejector pin, the end of the mandrel is fixed in ejector pin, and one end of the push rod is fixed in ejector pin, the other end and trimming of push rod
The end face of cam crank is abutted against.
Further, offer axially extending keyway on the outer peripheral face of the shear spool, the trimming cam crank with
Shear spool is connected by feather key, and the feather key is located in the keyway of shear spool and can be along the bearing of trend of keyway toward polyslip.
Further, also including the guide pad being fixed on shear spool and the moment of torsion being fixed on trimming cam crank
Transmission block, offers the gathering sill parallel to shear spool on the outer peripheral face of the guide pad, the moment of torsion transmits block towards guiding
One end of block is extended guide part, and the guide part coordinates with gathering sill gap and can be reciprocal along the bearing of trend of gathering sill
Sliding.
Preferably, the trimming cam crank offers D font through holes, and the shear spool is provided with one section of cross section for D
The axle linkage section of font, during the axle linkage section is located in D font through holes, both gaps coordinate.
Preferably, it is cased with back-moving spring on the shear spool and is fixed with positioned at back-up ring, the back-up ring is located at trimming crank
And reseting plate between, the two ends of the back-moving spring abut against with reseting plate and back-up ring respectively.
Preferably, be cased with reduction torsion spring on the shear spool, the two ends of the reduction torsion spring respectively with trimming crank and sewing
Machine bottom board is abutted against.
Further, automatic shearing mechanism is single action knife structure, and now, automatic shearing mechanism also includes being fixed on sewing machine
The stationary knife of base plate, the moving knife has one, and the moving knife component also includes a movable knife rack for being used to install moving knife, the driving machine
Structure includes trimming connecting rod, and the two ends of the trimming connecting rod are hinged with trimming crank and movable knife rack respectively.
Or, automatic shearing mechanism is double acting knife structure, and now, the moving knife has two, is respectively the first moving knife and the
Two moving knife, the moving knife component also includes that one is used to install the first movable knife rack of the first moving knife and for installing the second moving knife
The second movable knife rack, the drive mechanism include parallel the first trimming connecting rod and the second trimming connecting rod, the trimming crank
Have two, be respectively the first trimming crank and the second trimming crank, the two ends of the first trimming connecting rod respectively with the first trimming
Crank and the first movable knife rack are hinged, and the two ends of the second trimming connecting rod are cut with scissors with the second trimming crank and the second movable knife rack respectively
Connect.
Further, the trimming crank include separate crank portion and link rod part, one end of the crank portion with
Shear spool 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 drive mechanism
It is hinged.
Preferably, the crank portion is metallic sintered products, and the link rod part is sheet metal component.
Further, also including a knife rest gland in the form of annular discs, the knife rest gland is enclosed within lower axle and and movable knife rack
Dorsad the end face of trimming crank is abutted against, and the knife rest gland is fixed on baseplate of sewing machine by least one trip bolt, many
Individual trip bolt is radially extended along lower axle.
Further, the lower surface of the baseplate of sewing machine is provided with confined planes, and the trimming crank is towards confined planes
Accepting hole is offered on end face, cushion is built-in with the accepting hole, the cushion is engaged with confined planes.
The present invention also provides a kind of sewing machine, including baseplate of sewing machine and automatic shearing mechanism as described above, it is described under
Axle is rotatably supported in baseplate of sewing machine.
As described above, automatic shearing mechanism of the present invention and sewing machine, have the advantages that：
The application simplifies the structure of automatic shearing mechanism, by primary transmission can drive moving knife around lower axle swing and
Stationary knife is engaged, and realizes automatic shearing, and compared with prior art, the application simplifies the driving-chain of automatic shearing mechanism, so as to drop
Low cost.
Brief description of the drawings
Fig. 1 is the structural representation of automatic shearing mechanism in the prior art.
Fig. 2 is the explosive view of Fig. 1.
Fig. 3 is the schematic diagram of Fig. 1.
Fig. 4 is the structural representation of the automatic shearing mechanism of single action knife structure in the application.
Fig. 5, Fig. 6 are the structural representation after Fig. 4 omits baseplate of sewing machine.
Fig. 7 is the connection diagram of trimming crank and baseplate of sewing machine in Fig. 4.
Fig. 8 is the schematic diagram of trimming cam crank and trimming Axile connection structure embodiment one in the application.
Fig. 9 is the structural representation of reseting plate in Fig. 4.
Figure 10 is the schematic diagram of the automatic shearing mechanism of single action knife structure in the application.
Figure 11 is the structural representation of the automatic shearing mechanism of double acting knife structure in the application.
Figure 12 is the schematic diagram of trimming cam crank and trimming Axile connection structure embodiment two in the application.
Figure 13 is the schematic diagram of trimming cam crank and trimming Axile connection structure embodiment three in the application.
Figure 14 is the structural representation of trimming cam crank in Figure 13.
Component label instructions
1 baseplate of sewing machine
101 confined planes
2 lower axles
3 driving cams
31 trimming driving cams
32 trimming cam contour surfaces
33 forced resetting driving cams
34 forced resetting cam contour surfaces
35 connectors
4 movable knife racks
41 first movable knife racks
42 second movable knife racks
5 moving knife
51 first moving knife
52 second moving knife
6 stationary knifes
7 shear spools
71 keyways
72 axle linkage sections
8 trimming cam cranks
81 D font through holes
9 trimming cranks
91 crank portions
92 link rod parts
93 accepting holes
94 first trimming cranks
95 second trimming cranks
10 trimming connecting rods
11 balls
12 reseting plates
121 reseting plate bodies
122 left arm portions
123 forced resetting portions
124 through holes
125 right arm portions
126 connection through holes
13 power sources
14 push rods
15 ejector pins
16 feather keys
17 back-moving springs
18 back-up rings
19 reduction torsion springs
20 knife rest glands
21 roller shafts
22 first trimming connecting rods
23 second trimming connecting rods
24 guide pads
241 gathering sills
25 moments of torsion transmit block
251 guide parts
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 automatic shearing mechanism, in sewing machine, particularly flat seam machine, for sewing every time
Bottom line and upper thread are cut after end；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 near one end of head, and lower axle 2 is near tail
One end be right-hand member.As shown in Figures 4 to 6, under the automatic shearing mechanism includes rotatable support in the baseplate of sewing machine 1
Axle 2, the trimming driving cam 31 being fixed in lower axle 2, the moving knife component that can be swung around lower axle 2 trimming parallel with lower axle 2
Axle 7, the trimming cam crank 8 installed in the right-hand member of shear spool 7 and the trimming crank 9 of the left end of shear spool 7 is fixed on, it is described dynamic
Knife assembly includes at least one moving knife 5, and the outer peripheral face of the trimming driving cam 31 is trimming cam contour surface 32, the trimming
The ball 11 for protruding from the left side of trimming cam crank 8 is connected with cam crank 8, the trimming crank 9 passes through drive mechanism
It is connected with moving knife component.
Automatic shearing mechanism can be single action knife structure, as shown in Figures 4 to 6, the automatic shearing mechanism of single action knife structure
Also include being fixed on the stationary knife 6 of baseplate of sewing machine 1, the moving knife 5 has one, and the moving knife component also includes that one is used to install dynamic
The movable knife rack 4 of knife 5, the drive mechanism includes trimming connecting rod 10, the two ends of the trimming connecting rod 10 respectively with trimming crank 9 and
Movable knife rack 4 is hinged by the axial screw that left and right extends.In normal sewing, trimming cam crank 8 is in initial position, this
When, ball 11 is not disposed in the outer circumferential side of trimming driving cam 31, without matching relationship between trimming cam contour surface 32；Sewing knot
Shu Hou, trimming cam crank 8 is moved near the direction of trimming driving cam 31, ball 11 is located at trimming driving cam 31
Outer circumferential side is simultaneously engaged with trimming cam contour surface 32；Now, as shown in Figure 10, lower axle 2 drives trimming driving cam 31 synchronous
Rotate, trimming cam is driven with the matching relationship of ball 11 by the trimming section of trimming cam contour surface 32 in trimming driving cam 31
Crank 8, shear spool 7 and the three's synchronous hunting of trimming crank 9, realize primary transmission；Afterwards, trimming crank 9 directly passes through trimming
Connecting rod 10 drives movable knife rack 4 and moving knife 5 to be swung around lower axle 2, moving knife 5 is mutually stung with stationary knife 6 to the rotation near the direction of stationary knife 6
Close, and then cut bottom line and upper thread at rotating shuttle, complete automatic shearing.
Automatic shearing mechanism can be double acting knife structure, and as shown in figure 11, the moving knife 5 has two, respectively first moves
The moving knife 52 of knife 51 and second, the moving knife component also includes first movable knife rack 41, Yi Jiyong for being used to install the first moving knife 51
In the second movable knife rack 42 for installing the second moving knife 52, the drive mechanism is cut including parallel the first trimming connecting rod 22 and second
Line connecting rod 23, the trimming crank 9 has two, is respectively the first trimming crank 94 and the second trimming crank 95, and described first cuts
The two ends of line connecting rod 22 are hinged with the first trimming crank 94 and the first movable knife rack 41 by the axial screw that left and right extends respectively,
The axle position that the two ends of the second trimming connecting rod 23 are extended with the second trimming crank 95 and the second movable knife rack 42 by left and right respectively
Screw is hinged.In normal sewing, trimming cam crank 8 is in initial position, and now, it is convex that ball 11 is not disposed in trimming driving
The outer circumferential side of wheel 31, without matching relationship between trimming cam contour surface 32；After sewing terminates, trimming cam crank 8 is to close
Trimming driving cam 31 direction movement, make ball 11 be located at trimming driving cam 31 outer circumferential side and with trimming cam contour
Face 32 is engaged；Now, lower axle 2 drives the synchronous axial system of trimming driving cam 31, by trimming cam in trimming driving cam 31
Trimming section and the matching relationship of ball 11 of contoured surface 32 drive trimming cam crank 8, shear spool 7, (i.e. first cuts trimming crank 9
The trimming crank 95 of line crank 94 and second) synchronous hunting, realize primary transmission；Afterwards, the first trimming crank 94 is directly by the
One trimming connecting rod 22 drives the first movable knife rack 41 and the first moving knife 51 to be swung around lower axle 2, and the second trimming crank 95 directly passes through the
Two trimming connecting rod 23 drives the second movable knife rack 42 and the second moving knife 52 to be swung around lower axle 2, makes the first moving knife 51 and the second moving knife 52
It is opposite swing, until occlusion, and then bottom line and upper thread are cut at rotating shuttle, complete automatic shearing.
Compared with prior art, the application can drive the moving knife 51 of moving knife 5 or first and the second moving knife by primary transmission
52 swing, and simplify the driving-chain of automatic shearing mechanism, simplify the structure of automatic shearing mechanism, cancel complex structure in the prior art
Part, namely reduce each part in automatic shearing mechanism processing technology requirement so that reduce automatic shearing mechanism plus
Work cost, and then reduce the production cost of whole sewing machine.
The ball 11 can be fixed state, or the state of rolling, and the present embodiment is preferably using rolling
Pearl 11 is the state for rolling, it is possible to decrease frictional force when ball 11 coordinates with trimming cam contour surface 32 between the two；Now, such as
Shown in Fig. 8, the roller shaft 21 of one or so extension is fixed with the trimming cam crank 8, the ball 11 is rotationally enclosed within
On roller shaft 21 and positioned at the left side of trimming cam crank 8.Following examples are all with the sewing machine automatic shearing of single action knife structure
Launch narration as a example by mechanism.
Preferably, the radius in the trimming cam contour surface 32 with trimming section, trimming section gradually increases, therefore trimming section
End for trimming cam contour surface 32 peak；In addition, as shown in Figure 5 and Figure 6, being cased with resetting on the shear spool 7 and turning round
Spring 19, the two ends of the reduction torsion spring 19 abut against with trimming crank 9 and baseplate of sewing machine 1 respectively；When ball 11 and trimming cam
When trimming section on contoured surface 32 is engaged, moving knife 5 is rotated near the direction of stationary knife 6, performs trimming action；When by suture
After cutting, after ball 11 crosses the peak of trimming cam contour surface 32, trimming crank 9 is multiple in the presence of reduction torsion spring 19
Position, drives movable knife rack 4, moving knife 5, shear spool 7 and trimming cam crank 8 to reset by trimming connecting rod 10.
Further, as shown in Fig. 5 and Fig. 6 and Fig. 8 and Fig. 9, automatic shearing mechanism also includes reseting plate 12, and this is answered
Bit slice 12 is located at the left end side of trimming cam crank 8, and reseting plate 12 is generally concave, its reset for including the straight extension in left and right
Piece body 121 and the left arm portion 122 and right arm portion 125 that are located at the two ends of reseting plate body 121 or so, right arm portion 125
Rear and front end at all offer connection through hole 126, reseting plate 12 is at connection through hole 126 by screw and trimming cam crank
8 mutually fix, so as to reseting plate 12 is integrally fastened into trimming cam crank 8；There is the He of forced resetting portion 123 in left arm portion 122
Hold the through hole 124 that shear spool 7 is passed through, forced resetting driving cam 33 is fixed with lower axle 2, the forced resetting driving cam 33
Outer peripheral face is forced resetting cam contour surface 34.During trimming, when trimming cam crank 8 is near the direction of trimming driving cam 31
When mobile, trimming cam crank 8 drives reseting plate 12 to be moved near the direction of forced resetting driving cam 33, makes reseting plate 12
On forced resetting portion 123 be located at forced resetting cam contour surface 34 outer circumferential side；Mutually be engaged with stationary knife 6 when moving knife 5, by suture
During cutting, also as ball 11 cross trimming cam contour surface 32 peak in other words conj.or perhaps ball 11 move to trimming cam wheel
In profile surface 32 during the end of trimming section, the neighbour of forced resetting portion 123 is in forced resetting cam contour surface 34.Under normal circumstances, cut
Line crank 9, movable knife rack 4, moving knife 5, shear spool 7 and trimming cam crank 8 are realized by the reduction torsion spring 19 being enclosed within shear spool 7
Automatically reset, therefore trimming cam crank 8 also drives reseting plate 12 to reset simultaneously, after reset, forced resetting portion 123 on reseting plate 12
Become big with the gap between forced resetting driving cam 33, be insufficient to allow forced resetting portion 123 and forced resetting cam contour surface
34 are engaged, therefore in the case where normal reset is realized by reduction torsion spring 19, forced resetting portion 123 does not work.But,
Due to when card line or other reasonses cause the reduction torsion spring 19 moving knife 5 and stationary knife 6 can not be made to be separated, then movable knife rack 4, trimming crank
9th, shear spool 7, trimming cam crank 8 and reseting plate 12 be all without normal reset, now, the still neighbour of forced resetting portion 123 in
Forced resetting cam contour surface 34, therefore during drive forced resetting 33 synchronous axial system of driving cam of lower axle 2, by forced resetting portion
123 and the driving forced resetting piece 12 that is engaged of forced resetting cam contour surface 34 act, and then cause that reseting plate 12 resets, from
And trimming cam crank 8, shear spool 7, trimming crank 9, movable knife rack 4 and the forced resetting of moving knife 5 are driven, force moving knife 5 and stationary knife 6
It is separated, it is ensured that automatic shearing can be normally carried out next time.More preferably, as shown in figure 8, in the right arm portion 125 of reseting plate 12
Two connection through holes 126 be mounting hole, it can finely tune fixed position of the reseting plate 12 relative to trimming cam crank 8, from
And position of the forced resetting portion 123 relative to forced resetting driving cam 33 is finely tuned, namely adjustment ball 11 crosses trimming cam
The gap during peak of contoured surface 32, between forced resetting portion 123 and forced resetting cam contour surface 34.
Preferably, as shown in Figure 5 and Figure 6, the trimming driving cam 31 and forced resetting driving cam 33 are by connection
Part 35 is connected, and trimming driving cam 31 and forced resetting driving cam 33 are cut respectively positioned at the right side and left side of connector 35
Line driving cam 31, connector 35 and forced resetting driving cam 33 are processed into a single piece, and the single piece is defined as to drive
Cam 3.
In the present embodiment, the trimming cam crank 8 can be moved along the axial linear reciprocation of shear spool 7, so that ball 11
It is engaged with trimming cam contour surface 32 or is separated and makes forced resetting portion 123 close with forced resetting cam contour surface 34
Or away from guide effect can be played with being engaged for shear spool 7 by the through hole 124 in the left arm portion 122 of reseting plate 12.This
When, as shown in Figure 5 and Figure 6, automatic shearing mechanism also includes power source 13, and the power source 13 is by transmission mechanism and trimming cam
Crank 8 is connected；During trimming, power source 13 is acted, and trimming cam crank 8 is driven along the axial direction of shear spool 7 by transmission mechanism
It is moved to the left, the ball 11 is engaged with trimming cam contour surface 32, and be located at the forced resetting portion 123 and forces multiple
The outer circumferential side of position cam contour surface 34.Back-moving spring 17 is also cased with the shear spool 7 and is fixed with positioned at back-up ring 18, it is described
Back-up ring 18 is located between trimming crank 9 and reseting plate 12, the two ends of the back-moving spring 17 respectively with reseting plate 12 and back-up ring 18
Abut against；After trimming terminates, power source 13 is resetted, and reseting plate 12 and trimming cam crank 8 are made by the elastic force of back-moving spring 17
Move right, reset.
Preferably, the power source 13 be electromagnet, with the mandrel parallel to lower axle 2, the transmission mechanism includes top
Bar 14 and ejector pin 15, the left part of the mandrel are fixed in ejector pin 15, and the right-hand member of the push rod 14 is fixed in ejector pin 15, top
The left end of bar 14 is abutted against with the right side of trimming cam crank 8.During trimming, electromagnet is powered, and the iron core of electromagnet is in magnetic force
It is retracted to the left near the ferromagnetic direction of electromagnetism under effect, therefore the mandrel of electromagnet stretches out to the left, drives ejector pin 15 and push rod
14 are synchronously moved to the left, and then promote trimming cam crank 8 to be moved to the left.In order to realize that trimming cam crank 8 is moved left and right
When guiding and trimming cam crank 8 and shear spool 7 between moment of torsion transmission, trimming cam crank 8 has with shear spool 7
Two kinds of embodiments：Embodiment one, as shown in figure 8, offering axially extending keyway 71, institute on the outer peripheral face of the shear spool 7
State trimming cam crank 8 to be connected by feather key 16 with shear spool 7, the feather key 16 is located in the keyway 71 of shear spool 7 and can
Along the bearing of trend of keyway 71 freely toward polyslip, the mutual cooperation of feather key 16 and keyway 71 is used to realize trimming cam crank 8
Transmitted relative to the moment of torsion between the axial slip of shear spool 7 and trimming cam crank 8 and shear spool 7.Due in embodiment one
The assembling of feather key 16 needs to be carried out in the inner circumferential side of trimming cam crank 8, and it is very inconvenient to assemble, and trimming cam crank 8 needs
The extra keyway for starting to accommodate feather key 16, causes trimming cam crank 8 to process inconvenience.
To improve the assembling convenience of trimming cam crank 8 and shear spool 7, the application also provides a kind of trimming cam crank
8 with the embodiment two of the attachment structure of shear spool 7, as shown in figure 12, the also guide pad including being tightly fixed on shear spool 7
24 and it is fixed on moment of torsion on trimming cam crank 8 by two radial screws and transmits block 25, the guide pad 24 is located at and cuts
The left side of line cam crank 8, offers the gathering sill 241 of left and right insertion on the outer peripheral face of guide pad 24, the moment of torsion transmits block
25 are provided with the guide part 251 that extends to the left towards the left end of guide pad 24, the guide part 251 coordinates with the gap of gathering sill 241,
And can be along the bearing of trend of gathering sill 241 toward polyslip.When push rod 14 promotes trimming cam crank 8 and moment of torsion transmission block 25 together
When being moved to the left, being coordinated by the gap of guide part 251 and gathering sill 241 can play preferable guide effect；When trimming drives
When cam 31 drives trimming cam crank 8 and moment of torsion transmission block 25 to swing together by ball 11, by guide part 251 and guiding
The gap of groove 241 coordinates can drive guide pad 24 to be swung with moment of torsion transmission block 25, and then drive shear spool 7 with trimming cam
Crank 8 swings together, realizes that axial movement is oriented to and moment of torsion transmission.In the embodiment two, trimming cam crank 8 and guide pad 24
The through hole being engaged with shear spool 7 need to be only opened up, and trimming cam crank 8 transmits block 25 and leads with moment of torsion transmission block 25, moment of torsion
All carried out in the outside of trimming cam crank 8 to the assembling of block 24, therefore assemble very convenient, easy to operate, each part also easily adds
Work, assembly precision is high.
Or, trimming cam crank 8 can also use following embodiments three with the attachment structure of shear spool 7：Such as Figure 13 and
Shown in Figure 14, the connection through hole of left and right insertion is offered in trimming cam crank 8, the connection through hole for it is non-circular, with least
One section of planar portions, therefore connection through hole can be square, prismatic, polygon, D fonts etc.；The shear spool 7 is provided with one section of axle and connects
Section 72 is connect, this section of cross section of axle linkage section 72 is adapted with the shape for being connected through hole and coordinates with via clearance is connected, so that
Realize that trimming cam crank 8 is slided relative to axle linkage section 72 and can rotated with moving axis linkage section 72.More preferably, it is described to cut
Line cam crank 8 offers D fonts through hole 81, the cross section of the axle linkage section 72 on shear spool 7 also for D fonts and with D fonts
The gap of through hole 81 coordinates.
Simplify design of part, reduces cost in order to further, as shown in figure 5 and figure 7, by the automatic shearing of single action knife structure
Trimming crank 9 in mechanism resolves into separate crank portion 91 and link rod part 92, one end and the phase of shear spool 7 of crank portion 91
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, connecting rod
The other end in portion 92 is hinged with the trimming connecting rod 10.Or, as shown in figure 11, by the automatic shearing mechanism of double acting knife structure
In the first trimming crank 94 resolve into separate crank portion 91 and link rod part 92, one end and the shear spool 7 of crank portion 91
Mutually 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 the first trimming crank
94, the other end of link rod part 92 is hinged with the first trimming connecting rod 22.After by the split of trimming crank 9, its crank portion 91 can be simplified
With the structure of link rod part 92, and crank portion 91 can be made to use metallic sintered products, link rod part 92 is used sheet metal component, reduce part into
This.As shown in fig. 7, the lower surface of the baseplate of sewing machine 1 is provided with confined planes 101, the face of crank portion 91 of the trimming crank 9
Accepting hole 93 is offered on end face to confined planes 101, the cushion being made up of rubber, the bullet are built-in with the accepting hole 93
Property pad is engaged with confined planes 101, and the initial position of movable knife rack 4 and moving knife 5 is limited with this.
As shown in Figure 5 and Figure 6, automatic shearing mechanism also includes a knife rest gland 20 in the form of annular discs, the knife rest gland
20 are enclosed within lower axle 2 and are abutted against with the left side of the dorsad trimming crank 9 of movable knife rack 4, for pushing down movable knife rack 4；Due to automatic
Thread cutting mechanism structure simplifies, therefore may be such that knife rest gland 20 is fixed on baseplate of sewing machine 1 by least one trip bolt, described
Trip bolt is radially extended along lower axle 2, and taking up room for automatic shearing mechanism is reduced with this；In the present embodiment, due to knife
Frame gland 20 only serves position-limiting action, the axial force very little suffered by it, and the risk of the abjection of knife rest gland 20 is also just smaller, therefore is used for
The trip bolt of immovable support gland 20 and baseplate of sewing machine 1 one and only one.
The operation principle of the single action knife automatic shearing mechanism with said structure is as follows：Under original state, electromagnet power-off,
The iron core of electromagnet is the state stretched out to the right, and trimming cam crank 8 is located at the right side of driving cam 3, and ball 11 is convex with trimming
Wheel contoured surface 32 is separated, and moving knife 5 is separated with stationary knife 6.During trimming, electromagnet is powered, and mandrel is moved to the left, by ejector pin 15
Trimming cam crank 8 is promoted to overcome the pressure of back-moving spring 17 to be moved to the left with push rod 14, back-moving spring 17 is compressed, ball 11
Positioned at the outer circumferential side of trimming driving cam 31；Lower axle 2 drives the synchronous axial system of driving cam 3, makes ball 11 and trimming cam contour
The trimming section in face 32 is engaged, so as to drive trimming cam crank 8 to swing, trimming cam crank 8 drives shear spool 7 and trimming bent
The synchronous hunting of handle 9, trimming crank 9 drives movable knife rack 4 and moving knife 5 to be swung around lower axle 2 by trimming connecting rod 10, by bottom line and upper thread
Cut.Lower axle 2 drives driving cam 3 to continue synchronous axial system, and ball 11 crosses the peak of trimming cam contour surface 32, electromagnet
Power-off, back-moving spring 17 causes that reseting plate 12 and trimming cam crank 8 reset；Reduction torsion spring 19 makes trimming crank 9, moving knife simultaneously
Frame 4, moving knife 5, shear spool 7, trimming cam crank 8 reset, or reseting plate 12 makes trimming crank 9, moving knife when card line
Frame 4, moving knife 5, shear spool 7, trimming cam crank Final 8 system reset.So far, a trimming circulation is completed.
The application also provides a kind of sewing machine, including baseplate of sewing machine 1 and automatic shearing mechanism as described above, it is described under
Axle 2 is rotatably supported in baseplate of sewing machine 1.
In sum, 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 (16)
1. a kind of lower axle (2) of the automatic shearing mechanism, including rotatable support in baseplate of sewing machine (1), lower axle (2) is fixed on
On trimming driving cam (31) and the moving knife component that can be swung around lower axle (2), the moving knife component has at least one dynamic
Knife (5), it is characterised in that：Also include that the shear spool (7) parallel with lower axle (2), the trimming installed in shear spool (7) one end are convex
Wheel crank (8) and the trimming crank (9) of shear spool (7) other end is fixed on, is connected with the trimming cam crank (8)
Ball (11), the trimming crank (9) is connected by drive mechanism with moving knife component；During trimming, the ball (11) and cut
The trimming cam contour surface (32) of line driving cam (31) periphery is engaged, the trimming cam crank (8), shear spool (7) and
Trimming crank (9) synchronous hunting.
2. automatic shearing mechanism according to claim 1, it is characterised in that：Also include mutually solid with trimming cam crank (8)
Fixed reseting plate (12), the reseting plate (12) is provided with forced resetting portion (123) and holds away from one end of trimming cam crank (8)
The through hole (124) that shear spool (7) is passed through, forced resetting driving cam (33) is fixed with the lower axle (2)；When ball (11) fortune
When moving to trimming cam contour surface (32) end of trimming section, forced resetting portion (123) neighbour drives in forced resetting
The forced resetting cam contour surface (34) of cam (33) periphery.
3. automatic shearing mechanism according to claim 2, it is characterised in that：Also include power source (13), the power source
(13) it is connected with trimming cam crank (8) by transmission mechanism；During trimming, power source (13) action, by driver
Structure drives trimming cam crank (8) along the axial movement of shear spool (7), makes the ball (11) and trimming cam contour surface (32)
It is engaged, and makes the forced resetting portion (123) positioned at the outer circumferential side of forced resetting cam contour surface (34).
4. automatic shearing mechanism according to claim 3, it is characterised in that：The power source (13) is electromagnet, has
Parallel to the mandrel of lower axle (2), the transmission mechanism includes push rod (14) and ejector pin (15), and the end of the mandrel is fixed on top
In pin (15), one end of the push rod (14) is fixed in ejector pin (15), the other end and the trimming cam crank (8) of push rod (14)
End face abut against.
5. automatic shearing mechanism according to claim 3, it is characterised in that：Opened up on the outer peripheral face of the shear spool (7)
There is axially extending keyway (71), the trimming cam crank (8) is connected with shear spool (7) by feather key (16), the cunning
Key (16) is in the keyway (71) of shear spool (7) and can be along the bearing of trend of keyway (71) toward polyslip.
6. automatic shearing mechanism according to claim 3, it is characterised in that：Also include being fixed on leading on shear spool (7)
Block (25) is transmitted to block (24) and the moment of torsion being fixed on trimming cam crank (8), on the outer peripheral face of the guide pad (24)
The gathering sill (241) parallel to shear spool (7) is offered, the moment of torsion transmits block (25) and extends towards one end of guide pad (24)
Go out to have guide part (251), the guide part (251) coordinates with gathering sill (241) gap and can be along the extension of gathering sill (241)
Direction is toward polyslip.
7. automatic shearing mechanism according to claim 3, it is characterised in that：The trimming cam crank (8) offers D words
Shape through hole (81), the shear spool (7) is provided with the axle linkage section (72) that one section of cross section is D fonts, the axle linkage section
(72) in being located in D fonts through hole (81), both gaps coordinate.
8. automatic shearing mechanism according to claim 2, it is characterised in that：Back-moving spring is cased with the shear spool (7)
(17) and it is fixed with positioned at back-up ring (18), the back-up ring (18) is described multiple between trimming crank (9) and reseting plate (12)
The two ends of position spring (17) abut against with reseting plate (12) and back-up ring (18) respectively.
9. automatic shearing mechanism according to claim 1, it is characterised in that：Reduction torsion spring is cased with the shear spool (7)
(19), the two ends of the reduction torsion spring (19) abut against with trimming crank (9) and baseplate of sewing machine (1) respectively.
10. automatic shearing mechanism according to claim 1, it is characterised in that：Also include being fixed on baseplate of sewing machine (1)
Stationary knife (6), the moving knife (5) has one, and the moving knife component also includes a movable knife rack (4) for being used to install moving knife (5), described
Drive mechanism includes trimming connecting rod (10), and the two ends of the trimming connecting rod (10) are cut with scissors with trimming crank (9) and movable knife rack (4) respectively
Connect.
11. automatic shearing mechanisms according to claim 1, it is characterised in that：The moving knife (5) has two, is respectively the
One moving knife (51) and the second moving knife (52), the moving knife component also include first movable knife rack for being used to install the first moving knife (51)
(41) and for second movable knife rack (42) of the second moving knife of installation (52), the drive mechanism is cut including parallel first
Line connecting rod (22) and the second trimming connecting rod (23), the trimming crank (9) have two, are respectively the first trimming crank (94) and the
Two trimming cranks (95), the two ends of the first trimming connecting rod (22) respectively with the first trimming crank (94) and the first movable knife rack
(41) it is hinged, the two ends of the second trimming connecting rod (23) are cut with scissors with the second trimming crank (95) and the second movable knife rack (42) respectively
Connect.
The 12. automatic shearing mechanism according to claim 1 or 10 or 11, it is characterised in that：The trimming crank (9) includes
Separate crank portion (91) and link rod part (92), one end and the shear spool (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 and the drive mechanism of link rod part (92) are hinged.
13. automatic shearing mechanisms according to claim 12, it is characterised in that：The crank portion (91) is powder metallurgy
Part, the link rod part (92) is sheet metal component.
14. automatic shearing mechanisms according to claim 1, it is characterised in that：Also include a knife rest gland in the form of annular discs
(20), the knife rest gland (20) is enclosed within lower axle (2) and is abutted against with the end face of movable knife rack (4) dorsad trimming crank (9),
The knife rest gland (20) is fixed on baseplate of sewing machine (1) by least one trip bolt, and multiple trip bolts are along lower axle (2)
Radially extend.
15. automatic shearing mechanisms according to claim 1, it is characterised in that：On the lower surface of the baseplate of sewing machine (1)
It is provided with confined planes (101), the trimming crank (9) is towards offering accepting hole (93), the collecting on the end face of confined planes (101)
Cushion is built-in with hole (93), the cushion is engaged with confined planes (101).
A kind of 16. sewing machines, including baseplate of sewing machine (1), it is characterised in that：Also include as described in claim any one of 1-15
Automatic shearing mechanism, the lower axle (2) is rotatably supported in baseplate of sewing machine (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212222.3A CN106868735B (en) | 2017-04-01 | 2017-04-01 | Automatic thread trimming mechanism and sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212222.3A CN106868735B (en) | 2017-04-01 | 2017-04-01 | Automatic thread trimming mechanism and sewing machine |
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| Publication Number | Publication Date |
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| CN106868735A true CN106868735A (en) | 2017-06-20 |
| CN106868735B CN106868735B (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710212222.3A Active CN106868735B (en) | 2017-04-01 | 2017-04-01 | Automatic thread trimming mechanism and sewing machine |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108193390A (en) * | 2018-03-21 | 2018-06-22 | 杰克缝纫机股份有限公司 | Trimming drive component, thread cutting mechanism and 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 |
| CN108796856A (en) * | 2018-06-08 | 2018-11-13 | 杰克缝纫机股份有限公司 | Sewing machine automatic shearing mechanism |
| CN109234930A (en) * | 2018-12-03 | 2019-01-18 | 浙江美机缝纫机有限公司 | A kind of the automatic shearing mechanism and sewing machine 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 |
| CN110468520A (en) * | 2018-05-10 | 2019-11-19 | 天津宝盈电脑机械有限公司 | A kind of independent driving shuttle mechanism |
| CN113026231A (en) * | 2021-03-15 | 2021-06-25 | 拓卡奔马机电科技有限公司 | Rotary hook cutter thread trimming device and sewing machine |
| CN116497532A (en) * | 2023-06-28 | 2023-07-28 | 江苏长海消防装备有限公司 | Sewing machine thread cutting mechanism for processing firefighting gloves |
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|---|---|---|---|---|
| CN108193390A (en) * | 2018-03-21 | 2018-06-22 | 杰克缝纫机股份有限公司 | Trimming drive component, thread cutting mechanism and 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 |
| CN110468520A (en) * | 2018-05-10 | 2019-11-19 | 天津宝盈电脑机械有限公司 | A kind of independent driving shuttle mechanism |
| CN108796856A (en) * | 2018-06-08 | 2018-11-13 | 杰克缝纫机股份有限公司 | Sewing machine automatic shearing mechanism |
| CN108796856B (en) * | 2018-06-08 | 2020-10-02 | 杰克缝纫机股份有限公司 | Automatic thread trimming mechanism of sewing machine |
| CN109234930A (en) * | 2018-12-03 | 2019-01-18 | 浙江美机缝纫机有限公司 | A kind of the automatic shearing mechanism and sewing machine 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 |
| CN113026231A (en) * | 2021-03-15 | 2021-06-25 | 拓卡奔马机电科技有限公司 | Rotary hook cutter thread trimming device and sewing machine |
| CN113026231B (en) * | 2021-03-15 | 2022-11-29 | 拓卡奔马机电科技有限公司 | Rotary hook cutter thread trimming device and sewing machine |
| CN116497532A (en) * | 2023-06-28 | 2023-07-28 | 江苏长海消防装备有限公司 | Sewing machine thread cutting mechanism for processing firefighting gloves |
| CN116497532B (en) * | 2023-06-28 | 2023-08-29 | 江苏长海消防装备有限公司 | Sewing machine thread cutting mechanism for processing firefighting gloves |
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