CN106436072A - Thread trimming mechanism of sewing machine - Google Patents
Thread trimming mechanism of sewing machine Download PDFInfo
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- CN106436072A CN106436072A CN201611075255.XA CN201611075255A CN106436072A CN 106436072 A CN106436072 A CN 106436072A CN 201611075255 A CN201611075255 A CN 201611075255A CN 106436072 A CN106436072 A CN 106436072A
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- lower cutter
- cutter
- thread
- sewing machine
- plate
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/66—Disintegrating fibre-containing textile articles to obtain fibres for re-use
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a thread trimming mechanism of a sewing machine, and belongs to the technical field of machinery. The problem that due to the fact that an existing thread trimming mechanism of a sewing machine is complex in structure, the production cost is high is solved. The thread trimming mechanism comprises an upper cutter and a lower cutter which are arranged on the lower side of a needle plate, the needle plate, the upper cutter and the lower cutter are parallel to one another, a cutting edge is arranged on the upper side of the front end of the lower cutter, and the lower side of the front end of the upper cutter is provided with a cutting portion; a sewing machine workbench is provided with a first driving part which can drive the lower cutter to move front and back relative to the upper cutter, the lower cutter is provided with a thread hooking groove which enables the front end of the lower cutter to be shaped like an inverted hook, a thread inlet through hole is formed in the lower cutter from top to bottom and located between the thread hooking groove and the cutting edge, and an elastic thread clamping sheet is connected to the front end of the upper cutter and located outside the front end of the lower cutter. The thread trimming mechanism has the advantages that upper threads can be clamped and cut off at the beginning of sewing through the two cutters to eliminate a bird nest phenomenon, the upper threads and bottom threads can be cut off together when sewing is finished, and the overall structure of the sewing machine is simplified.
Description
Technical field
The invention belongs to field of mechanical technique, it is related to a kind of sewing machine, particularly a kind of thread cutting mechanism of sewing machine.
Background technology
Existing sewing machine surface thread penetrates in the pin hole of eedle, and bottom line is wrapped on the peg or spindle in rotating shuttle.During sewing, upper thread
Interweave with bottom line and form wire loop and then form required stitching.Typically all can be configured with existing industrial sewing machine special from
Dynamic thread cutting mechanism, needs together to cut off bottom line and upper thread after sewing finishing.Because eedle pin hole side must have one section of face
Line, can form larger Bird's Nest phenomenon in sewing reverse side.Constantly develop with scientific and technological level, the automaticity of sewing machine is more next
Higher, existing industrial sewing machine typically all can be configured with special automatic shearing mechanism, automatic shearing mechanism is divided into
Cut upper thread mechanism and cut bottom line mechanism, cut upper thread mechanism dedicated for cutting upper thread, cut bottom line mechanism dedicated for cutting bottom line, adopt
The automatic shearing mechanism of this mode can lead to that the overall structure of sewing machine is sufficiently complex, and production cost is very high, and practicality is not high.
In order to solve this problem, Chinese patent was once disclosed a kind of thread cutter [application number of sewing machine：
02120318.0], it includes configuration below needle plate, carries out the past of crosscutting eedle lowering position under the driving of impulse motor
The 1st cutting knife that double action is made；Under the driving of pneumatic cylinder the side of eedle lowering position one side formed interval position of readiness with
Carry out the 2nd of reciprocating action between the off-position cutting off suture in sewing finishing by the interoperation of the 1st cutting knife to cut
Knife；Form the initial position of certain distance in the side with eedle lowering position the opposing party and with the 1st cutting knife to the 2nd cutting knife side
The mobile position moving certain distance from initial position, by the interoperation cut-out seam with the first cutting knife after sewing starts
3rd cutting knife of line；And be fixed on the 3rd cutting knife in initial position and move certain distance position on, by with the 1st
When the interoperation of cutting knife starts sewing, the suture of the 1st pin is clamped in the clamp below sewing object.The tangent line of this sewing machine
Suture can be cut off and be utilized clamp to press from both sides suture using the cooperation of the 1st cutting knife and the 3rd cutting knife when sewing starts by device
Handle, using the cooperation of the 1st cutting knife and the 2nd cutting knife, suture can also be cut off after sewing finishing simultaneously.
Although the thread cutter of above-mentioned sewing machine has been provided simultaneously with when sewing starts by suture cut-out and in sewing knot
The function of after bundle, suture being cut off, but in place of it still has some shortcomings：For suture being cut off when sewing starts
Be the 1st cutting knife and the 3rd cutting knife, be the 1st cutting knife and the 2nd cutting knife for cut off suture after sewing finishing, and the 1st cut
Knife, the 2nd cutting knife and the 3rd cutting knife are required for configuring special driving means again and are operated alone, and this results in sewing machine
Overall structure still complex, and parts excessively make whole sewing machine production cost still higher.
Content of the invention
The purpose of the present invention is to there are the problems referred to above for existing technology it is proposed that a kind of thread cutting mechanism of sewing machine, institute
Technical problem to be solved is how to realize clamping and cutting off upper thread to eliminate Bird's Nest phenomenon when sewing starts using two knives
And together cut off upper thread and bottom line in sewing finishing, to simplify the overall structure of sewing machine.
The purpose of the present invention can be realized by following technical proposal：
A kind of thread cutting mechanism of sewing machine, including the upper cutter on the downside of the needle plate being arranged on sewing machine table and incision
Knife, needle plate, upper cutter and lower cutter are parallel, are provided with cutting edge on the upside of described lower cutter front end, on the downside of described upper cutter front end
There is cutting part, described sewing machine table is provided with the actuator that lower cutter can be driven to move forward and backward with respect to upper cutter
One, described lower cutter has and hooks wire casing and hook wire casing to make the front end of lower cutter to be in barb-like it is characterised in that described lower cutter
On be provided with the entrance hole running through and entrance hole from the top down and be located at and hook between wire casing and cutting edge, the front end of described upper cutter is connected with
Has resilient thread tension disc, described thread tension disc is located at outside the front end of lower cutter, and the incision described in when lower cutter moves forward
The front end of thread tension disc and upper cutter upwardly and can be made thread tension disc and the cutting part of upper cutter front end be pressed in incision by knife front end
On the upper side of knife.
Upper thread can be clamped when sewing starts and cut off and by upper thread after sewing finishing by this thread cutting mechanism of sewing machine
Together cut off with bottom line.When sewing starts, lower cutter is controlled to move forward to the entrance hole on lower cutter by actuator one
The underface of the pin hole on needle plate, so when eedle drives upper thread to pass through pin hole, upper thread can drop into inlet wire in the hole,
Then actuator one controls lower cutter retraction.Because the front end of lower cutter when lower cutter moves forward is by thread tension disc and upper cutter
Front end upwardly and makes thread tension disc and the cutting part of upper cutter front end be pressed on the upper side of lower cutter, therefore when lower cutter returns
During contracting, the upper side of lower cutter is the cutting part movement that against thread tension disc and upper cutter, and upper thread can be clipped in lower cutter by thread tension disc
Upper side on, and when the cutting edge that lower cutter bounces back on lower cutter is staggered with the cutting part of upper cutter, upper thread is cut off,
Upper thread after cut-off is still clipped on the upper side of lower cutter by thread tension disc, sewing reverse side no Bird's Nest phenomenon.In sewing finishing
Afterwards, control lower cutter to move forward again by actuator one, and bottom line and upper thread are hooked in wire casing simultaneously, then drive
Part one controls lower cutter retraction, and equally when the cutting edge that lower cutter bounces back on lower cutter is staggered with the cutting part of upper cutter
By the cutting part of upper cutter, bottom line and upper thread are cut off simultaneously.
This thread cutting mechanism of sewing machine passes through to arrange entrance hole between the hook wire casing on lower cutter and cutting edge, using entrance hole
Cooperation with the thread tension disc being connected to upper cutter front end makes upper cutter and lower cutter possess bottom line and upper thread in sewing finishing
The function of together cutting off is simultaneously but also with clamping upper thread when sewing starts and the function cut off is such that it is able to greatly simplify
The overall structure of sewing machine, and thus reduce the production cost of whole sewing machine.
In above-mentioned thread cutting mechanism of sewing machine, described thread tension disc is connected on the upside of the front end of upper cutter, described folder
The front end of line piece has the crimping curving downward and to outside upper cutter front end.
The front end of thread tension disc is curved downward and to the external formation in upper cutter front end crimping, crimping is just provided with elasticity,
When lower cutter stretches out, the crimping of thread tension disc is upwardly made crimping produce deformation by the front end of lower cutter, so exists
Lower cutter stretches out on the upper side that rear crimping can be pressed in lower cutter under the elastic force effect of itself, then when upper thread drops into down
The inlet wire in the hole of cutting knife when lower cutter bounces back, crimping upper thread will be clipped on the upper side of lower cutter naturally.Logical
Cross and such be designed to realize clamping and cutting when sewing starts using lower cutter and upper cutter in this thread cutting mechanism of sewing machine
Section line and together cut off upper thread and bottom line in sewing finishing, with simplify sewing machine overall structure while it is ensured that face
The clamping of line remains able to normally realize.
In above-mentioned thread cutting mechanism of sewing machine, the downside of described needle plate has a resigning groove, described thread tension disc position
In resigning groove.
When lower cutter stretches out or bounces back and so that the upper side of lower cutter front end and the bottom surface of the crimping of thread tension disc is contacted
When, the upper side of lower cutter front end can by the crimping of thread tension disc upwardly, by arranging resigning groove in the downside of needle plate,
Resigning groove can provide enough deformation spaces for crimping, so that crimping can successfully deform upon upper thread
It is clipped on the upper side of lower cutter.
In above-mentioned thread cutting mechanism of sewing machine, described sewing machine table is fixed with motor mounting plate, described
Actuator one includes the motor being fixed on motor mounting plate, and the output shaft of motor is perpendicular with motor mounting plate,
It is provided with crank and connecting rod, one end of described crank is defeated with motor between the output shaft of described motor and lower cutter
Shaft is connected, and the other end of crank is hinged with one end of connecting rod, and the other end of connecting rod is connected with the rear end of lower cutter, described
Motor mounting plate on be fixed with first sensor, be connected on the upside of one end that described crank is connected with the output shaft of motor
There is detection plate, the height of detection plate is higher than first sensor, and motor drives lower cutter to move forward to when sewing starts
Described detection plate is just right with first sensor.
One end of crank is connected with the output shaft of motor, then the output shaft rotation of motor can drive crank
Swing, and the other end due to crank and one end of connecting rod are hinged, the other end of connecting rod is connected with the rear end of lower cutter, because
This will drive lower cutter to move forward and backward after crank-swinging by connecting rod, thus controlling stretching out and retraction of lower cutter.Logical
The first sensor crossed on motor mounting plate is connected inspection with being connected on the upside of one end that crank is connected with the output shaft of motor
Drafting board matches, so that lower cutter can accurately move the underface of the pin hole being located on needle plate to entrance hole when starting to sew,
So that it is guaranteed that upper thread can drop into inlet wire in the hole exactly being excised, this is also for this thread cutting mechanism of sewing machine of guarantee
Can realize cutting and in sewing finishing upper thread by upper thread when sewing starts merely with lower cutter and upper cutter simultaneously
Cut off with bottom line.
In above-mentioned thread cutting mechanism of sewing machine, the downside of described needle plate is fixed with location-plate, and location-plate has out
If to the locating slot of location-plate two end faces, upper cutter and lower cutter are respectively positioned in locating slot, under the described front end of location-plate
Side is connected with spring leaf, and spring leaf is fixed with felt, and felt is located at the lower section of lower cutter and felt is contacted with lower cutter.
When after sewing finishing, bottom line and upper thread are together cut off, remaining bottom line remains the hook wire casing positioned at lower cutter
Interior, and due to being connected with spring leaf on the downside of the front end of location-plate, spring leaf is fixed with felt and felt is located at lower cutter
Lower section and contact with lower cutter, then when lower cutter bounces back to remaining bottom line and felt surface phase with remaining bottom line
During contact, remaining bottom line will be bonded on felt, thus realizing the clamping to bottom line.Using such structure, it is also mainly
In order to this sewing machine trimming to be realized when sewing starts by upper thread cut-out and in seam merely with upper cutter and lower cutter simultaneously
Additionally it is possible to ensure that bottom line can normally be pressed from both sides after being cut off while the function that upper thread and bottom line are together cut off after terminating by system
Live it is ensured that next time sewing when can smoothly with upper thread interweave formation wire loop, it is to avoid bouncing pilotage phenomenon appearance.
Compared with prior art, this thread cutting mechanism of sewing machine passes through to arrange entrance hole on lower cutter and before upper cutter
End connect thread tension disc so that upper cutter and lower cutter possess after sewing finishing by upper thread with while bottom line shearing function again
Possesses the function of upper thread being cut off when sewing starts, this also means that this thread cutting mechanism of sewing machine only passes through two cutting knifes just
It is integrated with when sewing starts simultaneously and upper thread is clamped and cuts off and after sewing finishing, upper thread and bottom line are cut off simultaneously and pressed from both sides
Live the function of bottom line, this be designed to simplify the overall structure of sewing machine well, and thus also can reduce well
The production cost of whole sewing machine.In addition, this thread cutting mechanism of sewing machine passes through to connect thread tension disc, thread tension disc in the front end of upper cutter
Front end there is the crimping curving downward and to outside lower cutter front end, using crimping and lower cutter upper side cooperation in sewing
During beginning, upper thread is clamped, so that this thread cutting mechanism of sewing machine is cut cutting when sewing and starting after the function of upper thread and sewing finishing
The function of bottom line and upper thread still possesses due function while being integrated into upper cutter with lower cutter.
Brief description
Fig. 1 is schematic diagram when this thread cutting mechanism of sewing machine is arranged on sewing machine table.
Fig. 2 is the schematic diagram of this thread cutting mechanism of sewing machine.
Fig. 3 is the schematic diagram of another angle of this thread cutting mechanism of sewing machine.
Fig. 4 is the partial enlarged drawing in Fig. 3.
Fig. 5 is the optical cable of this thread cutting mechanism of sewing machine.
Fig. 6 is the exploded view between upper cutter in this thread cutting mechanism of sewing machine, lower cutter and location-plate.
Fig. 7 is the structural representation of lower cutter in this thread cutting mechanism of sewing machine.
Fig. 8 is the structural representation of upper cutter in this thread cutting mechanism of sewing machine.
Fig. 9 be this thread cutting mechanism of sewing machine lower cutter stretches out when sewing starts after upward view.
Figure 10 is the top view of Fig. 9.
Figure 11 is upward view after lower cutter stretches out after sewing finishing for this thread cutting mechanism of sewing machine.
In figure, 1, workbench；2nd, needle plate；2a, resigning groove；3rd, upper cutter；3a, cutting part；3a1, stress surface；3b, limit
Position hole；3c, connecting portion；4th, lower cutter；4a, cutting edge；4b, hook wire casing；4c, entrance hole；4d, facet；4e, clamp face；4f, lead
To face；5th, location-plate；5a, locating slot；5b, connecting hole；5c, spacing breach；6th, thread tension disc；6a, crimping；7th, spring leaf；8、
Felt；9th, motor mounting plate；10th, motor；11st, crank；12nd, pull bar；12a, union joint；13rd, fixed plate；14th, the first biography
Sensor；15th, second sensor；16th, detection plate；17th, motor；18th, connecting rod；18a, plush copper.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 5, a kind of thread cutting mechanism of sewing machine, the needle plate 2 on sewing machine table 1
Downside, it includes being arranged at upper cutter 3 and the lower cutter 4 of needle plate 2 downside, lower cutter 4 be located at upper cutter 3 lower section and on cut
Knife 3 is resisted against on lower cutter 4, and needle plate 2, upper cutter 3 and lower cutter 4 are parallel, has convex downwards on the downside of the front end of upper cutter 3
The cutting part 3a going out, has cutting edge 4a on the upside of the front end of lower cutter 4.The workbench 1 of sewing machine is provided with actuator one and drives
Part two, actuator one is connected with lower cutter 4, and actuator two is connected with upper cutter 3, can make incision under the drive of actuator one
Knife 4 is moved forward or rearward, and upper cutter 3 can be made under the drive of actuator two to be moved forward or rearward.
As shown in Fig. 6, Fig. 7 and Fig. 8, lower cutter 4 has hook wire casing 4b, hook wire casing 4b and make the front end of lower cutter 4 to be in
Barb-like, lower cutter 4 is provided with the entrance hole 4c running through, and entrance hole 4c is located at the cutting edge 4a of lower cutter 4 and hooks between wire casing 4b.
The upside of lower cutter 4 front end has facet 4d, clamp face 4e and spigot surface 4f back to front successively, and facet 4d is by inlet wire
Tilt on lower cutter 4 at the 4c of hole all the way up compared to cutting edge 4a closer at the position of lower cutter 4 leading section, clamp face 4e
Faced forward extension by inclination, spigot surface 4f is downward-sloping by clamp face 4e, the bottom of the cutting part 3a of upper cutter 3 has and guiding
Face 4f incline direction identical stress surface 3a1.
As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the downside of needle plate 2 is fixed with location-plate 5, location-plate 5 has and opens up
To the locating slot 5a of location-plate 5 two end faces, upper cutter 3 and lower cutter 4 are respectively positioned in locating slot 5a.On the front end of upper cutter 3
Side is connected with thread tension disc 6, and the front end of thread tension disc 6 has the crimping 6a outside the front end curving downward and to upper cutter 3, needle plate 2
Downside has resigning groove 2a, and thread tension disc 6 is located in resigning groove 2a, when lower cutter 4 retraction makes the facet on lower cutter 4
When 4d is contacted with the crimping 6a of thread tension disc 6, facet 4d can be by the clamp of thread tension disc 6 during lower cutter 4 retraction
Upwardly, and the setting of the groove 2a that steps down then can just ensure that the crimping 6a of thread tension disc 6 has enough deformation to portion 6a
Space.It is connected with spring leaf 7 on the downside of the front end of location-plate 5, spring leaf 7 is fixed with felt 8, felt 8 is located under lower cutter 4
Side and felt 8 is contacted with lower cutter 4.
As shown in Figure 1, Figure 2, shown in Fig. 3 and Fig. 5, sewing machine table 1 has installation with location-plate 5 position corresponding section
Groove, location-plate 5 is located in mounting groove.It is additionally provided with motor mounting plate 9 at needle plate 2, actuator one wraps on sewing machine table 1
Include the motor 10 being fixed on motor mounting plate 9, the output shaft of motor 10 is perpendicular with motor mounting plate 9, drive
Crank 11 is connected with the output shaft of motor 10.One end of crank 11 is connected with the output shaft of motor 10, crank 11 another
One end is connected with a pull bar 12 and this end of crank 11 is hinged with one end of pull bar 12, and the other end of pull bar 12 is located at sewing machine
Lower section in mounting groove on workbench 1 and positioned at location-plate 5, and at this end of pull bar 12, there is the union joint raising up
12a, union joint 12a is cylindrical, and the diapire of the locating slot 5a on location-plate 5 is provided with connecting hole that run through and elongated
5b, upper cutter 3 is provided with spacing hole 3b that run through and elongated, after union joint 12a passes through connecting hole 5b and lower cutter 4
Hold and be located in the spacing hole 3b of upper cutter 3.Upper cutter 3 arranges spacing hole 3b, is primarily used to the movement to lower cutter 4
Stroke carries out spacing, prevents lower cutter 4 mobile excessively, in addition, being further fixed on the fixed plate in circular arc on motor mounting plate 9
13, first sensor 14 and second sensor 15, crank 11 and motor 10 are respectively fixed with the two ends of fixed plate 13
It is connected with fan-shaped detection plate 16 on the upside of connected one end, the height of detection plate 16 is higher than the height of sensor, when sewing is opened
During the beginning, lower cutter 4 with first sensor 14 is mutually just moving forward to detection plate 16 on crank 11 under the drive of motor 10
Right, and second sensor 15 is then used for the retraction of lower cutter 4 is formed to be controlled, lower cutter 4 bounce back to detection plate 16 with
Second sensor 15 just pair when control motor 10 to quit work.
As shown in Figure 1, Figure 2, Fig. 3 and Fig. 5, actuator two includes the driving cylinder 17 being fixed on motor mounting plate 9, drive gas
The piston rod of cylinder 17 is paralleled with motor mounting plate 9, and the end of the piston rod of driving cylinder 17 is connected with connecting rod 18.Connecting rod 18 wraps
Include section and the vertical section perpendicular with section anyhow anyhow, the vertical section phase of the end of the piston rod of driving cylinder 17 and connecting rod 18
Connect, the section anyhow of connecting rod 18 is located in the mounting groove of sewing machine table 1 and is located at the lower section of location-plate 5.Location-plate 5 sidepiece
There is spacing breach 5c being connected with locating slot 5a, the middle part side of upper cutter 3 has outwardly connecting portion 3c, connect
Portion 3c is located in spacing breach 5c, the section anyhow of connecting rod 18 with have on the upside of the other end that vertical section is connected cylindrical convex
Head 18a, plush copper 18a be located at spacing breach 5c in and plush copper 18a end pass through upper cutter 3 connecting portion 3c, by setting limit
Position breach 5c can limit to the shift motion of upper cutter 3, it is to avoid upper cutter 3 is excessively mobile, and leads to not and incision
Knife 4 matches to carry out normal trimming.
This thread cutting mechanism of sewing machine can be cut off and in sewing finishing upper thread by upper thread and bottom line when sewing starts
Cut off simultaneously.It is such for opening and cutting off the detailed process of upper thread during seam：As shown in Figure 9 and Figure 10, when sewing starts, upper cutter 3
Remain stationary as, the output shaft rotation of motor 10 simultaneously drives crank 11 to produce swing, by the cooperation of crank 11 and pull bar 12
Make the detection lug that lower cutter 4 extend out on crank 11 with respect to the front end of upper cutter 3 just right with first sensor 14, this is at present
Entrance hole 4c on cutting knife 4 is located just at the underface of the pin hole on needle plate 2, so, when upper thread is passed through pin hole by eedle
Taking to can be so that upper thread be located in the entrance hole 4c on lower cutter 4 during needle plate 2 downside.During lower cutter 4 stretches out,
The crimping 6a of thread tension disc 6 and the front end of upper cutter 3 is made to be squeezed upwards in the presence of the spigot surface 4f of lower cutter 4 front end
Pressure, under the elastic force effect of itself, the crimping 6a of the thread tension disc 6 and cutting part 3a of upper cutter 3 can be pressed in lower cutter 4 afterwards
On upper side.Then the output shaft of motor 10 rotates backward so that lower cutter 4 bounces back, during lower cutter 4 retraction,
Because the crimping 6a of the thread tension disc 6 and cutting part 3a of upper cutter 3 is attached on the upper side of lower cutter 4 all the time, therefore upper thread
It is clipped on the upper side of lower cutter 4 by crimping 6a, and bounce back to cutting edge 4a and the upper cutter 3 on lower cutter 4 in lower cutter 4
When cutting part 3a is staggered, upper thread is cut off by lower cutter 4.
It is such for stopping cutting off upper thread and the detailed process of bottom line during seam：As shown in figure 11, after sewing finishing, drive electricity
Machine 10 passes through crank 11 and controls lower cutter 4 to move forward with the cooperation of connecting rod 18, and the piston rod of driving cylinder 17 stretches out and passes through
Connecting rod 18 drives upper cutter 3 to move forward, and the distance of lower cutter 4 movement is greater than the distance of upper cutter 3 movement.Due to incision
Knife 4 is provided with hook wire casing 4b, therefore can together hook into upper thread and bottom line in wire casing 4b after lower cutter 4 forward movement,
Then motor 10 controls lower cutter 4 to bounce back, when lower cutter 4 bounces back to cutting edge 4a on lower cutter 4 on upper cutter 3
During cutting part 3a, upper thread is just together cut off with bottom line.After upper thread is cut off with bottom line, remaining bottom in sewing machine table 1
Line is still hooked in the hook wire casing 4b on lower cutter 4, and the piston rod of driving cylinder 17 bounces back and drives upper cutter 3 to bounce back to initially
Position, lower cutter 4 then bounces back to initial position under the drive of motor 10.It is provided with block due at the front end of location-plate 5
The felt 8 of shape, when therefore at lower cutter 4 moves to felt 8, the bottom line being caught on by hook wire casing 4b will be bonded on felt 8.
It is noted herein that, during cut-out upper thread and bottom line, upper cutter 3 is also moved forward a certain distance and be mainly
In order to the end of a thread is cut shorter.
This thread cutting mechanism of sewing machine passes through to arrange entrance hole 4c on lower cutter 4 and connects clamp in the front end of upper cutter 3
Piece 6 so that upper cutter 3 and lower cutter 4 possess after sewing finishing by upper thread with while bottom line shearing function but also with
The function of clamping upper thread when sewing starts and cut off, this also means that this thread cutting mechanism of sewing machine only passes through two cutting knifes just
It is integrated with when sewing starts simultaneously and upper thread is clamped and cuts off and after sewing finishing, upper thread and bottom line are cut off simultaneously simultaneously
Clamp the function of bottom line, this design simplifies the overall structure of sewing machine well, and thus also can reduce well
The production cost of whole sewing machine.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (5)
1. a kind of thread cutting mechanism of sewing machine, including the upper cutter (3) on the downside of the needle plate (2) being arranged on sewing machine table (1)
With lower cutter (4), needle plate (2), upper cutter (3) and lower cutter (4) be parallel, is provided with sword on the upside of described lower cutter (4) front end
Mouth (4a), has cutting part (3a), described sewing machine table (1) is provided with and can drive on the downside of described upper cutter (3) front end
The actuator one that lower cutter (4) moves forward and backward with respect to upper cutter (3), described lower cutter (4) has hook wire casing (4b) and hooks
Wire casing (4b) makes the front end of lower cutter (4) run through it is characterised in that being provided with from the top down on described lower cutter (4) in barb-like
Entrance hole (4c) and entrance hole (4c) be located at and hook between wire casing (4b) and cutting edge (4a), the connection of the front end of described upper cutter (3)
There is the resilient thread tension disc of tool (6), described thread tension disc (6) is located at outside the front end of lower cutter (4), and when lower cutter (4) is to reach
Lower cutter (4) front end described in when dynamic can by the front end of thread tension disc (6) and upper cutter (3) upwardly and make thread tension disc (6) and
The cutting part (3a) of upper cutter (3) front end is pressed on the upper side of lower cutter (4).
2. thread cutting mechanism of sewing machine according to claim 1 is it is characterised in that described thread tension disc (6) is connected to and cuts
On the upside of the front end of knife (3), the front end of described thread tension disc (6) has the crimping curving downward and to outside upper cutter (3) front end
(6a).
3. thread cutting mechanism of sewing machine according to claim 2 is it is characterised in that the downside of described needle plate (2) has allows
Position groove (2a), described thread tension disc (6) is located in resigning groove (2a).
4. the thread cutting mechanism of sewing machine according to claim 1 or 2 or 3 is it is characterised in that described sewing machine table
(1) it is fixed with motor mounting plate (9) on, described actuator one includes the motor being fixed on motor mounting plate (9)
(10), the output shaft of motor (10) is perpendicular with motor mounting plate (9), the described output shaft of motor (10) with
It is provided with crank (11) and connecting rod (12), one end of described crank (11) and the output shaft phase of motor (10) between cutting knife (4)
Connect, the other end of crank (11) is hinged with one end of connecting rod (12), the rear end of the other end of connecting rod (12) and lower cutter (4)
Connect, described motor mounting plate (9) is fixed with first sensor (14), described crank (11) and motor (10)
It is connected with detection plate (16), the height of detection plate (16) is higher than first sensor (14), works as seam on the upside of one end that output shaft is connected
When system starts, motor (10) drives lower cutter (4) with first sensor (14) just moving forward to described detection plate (16)
Right.
5. the thread cutting mechanism of sewing machine according to claim 1 or 2 or 3 is it is characterised in that the downside of described needle plate (2)
It is fixed with location-plate (5), location-plate (5) has the locating slot (5a) opening up to location-plate (5) two end faces, upper cutter (3)
And lower cutter (4) is respectively positioned in locating slot (5a), on the downside of the described front end of location-plate (5), it is connected with spring leaf (7), spring leaf
(7) it is fixed with felt (8) on, felt (8) is located at the lower section of lower cutter (4) and felt (8) is contacted with lower cutter (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075255.XA CN106436072B (en) | 2016-11-29 | 2016-11-29 | Thread cutting mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611075255.XA CN106436072B (en) | 2016-11-29 | 2016-11-29 | Thread cutting mechanism of sewing machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938192A (en) * | 2017-12-26 | 2018-04-20 | 方琳 | Cut the control method of bottom line device, sewing machine and sewing machine |
| CN108442051A (en) * | 2018-03-31 | 2018-08-24 | 宁波舒普机电股份有限公司 | A kind of trimming thread ends control mechanism of sewing machine |
| CN109234928A (en) * | 2018-11-14 | 2019-01-18 | 杰克缝纫机股份有限公司 | A kind of thread cutting mechanism and sewing machine |
| CN109868574A (en) * | 2019-04-09 | 2019-06-11 | 拓卡奔马机电科技有限公司 | A kind of double acting knife cutting facility of sewing machine and method |
| CN111020903A (en) * | 2019-12-17 | 2020-04-17 | 杰克缝纫机股份有限公司 | Seam-making thread trimming mechanism and method thereof |
| CN112226928A (en) * | 2020-11-11 | 2021-01-15 | 东莞市钰腾机械科技有限公司 | Sew with long stitches cutting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107938192A (en) * | 2017-12-26 | 2018-04-20 | 方琳 | Cut the control method of bottom line device, sewing machine and sewing machine |
| CN108442051A (en) * | 2018-03-31 | 2018-08-24 | 宁波舒普机电股份有限公司 | A kind of trimming thread ends control mechanism of sewing machine |
| CN109234928A (en) * | 2018-11-14 | 2019-01-18 | 杰克缝纫机股份有限公司 | A kind of thread cutting mechanism and sewing machine |
| CN109868574A (en) * | 2019-04-09 | 2019-06-11 | 拓卡奔马机电科技有限公司 | A kind of double acting knife cutting facility of sewing machine and method |
| CN109868574B (en) * | 2019-04-09 | 2024-03-01 | 拓卡奔马机电科技有限公司 | Double-acting knife thread cutting device and method for sewing machine |
| CN111020903A (en) * | 2019-12-17 | 2020-04-17 | 杰克缝纫机股份有限公司 | Seam-making thread trimming mechanism and method thereof |
| CN111020903B (en) * | 2019-12-17 | 2021-08-24 | 杰克缝纫机股份有限公司 | Seam-making thread trimming mechanism and method thereof |
| CN112226928A (en) * | 2020-11-11 | 2021-01-15 | 东莞市钰腾机械科技有限公司 | Sew with long stitches cutting device |
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Effective date of registration: 20200927 Address after: 198 Xinggang East Road, Damaiyu street, Yuhuan City, Taizhou City, Zhejiang Province Applicant after: ZOJE SEWING MACHINE Co.,Ltd. Address before: 317604, Taizhou, Zhejiang province Yuhuan County barley island Street Hing Tung Road, No. 198 Applicant before: ZOJE SEWING MACHINE Co.,Ltd. Applicant before: ZHEJIANG JOYEE SEWING MACHINE Co.,Ltd. Applicant before: ZHEJIANG BSM SEWING MACHINE Co.,Ltd. |
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