CN109554850A - A kind of secret needle short-term head device of sewing and sewing machine - Google Patents

Abstract

The present invention provides a kind of secret needle short-term head device of sewing, including can act on the driving member of cloth feeding mechanism in sewing machine, the card slot being provided on driving member, the short-term head driving source that can be moved to the retainer and driving retainer moved close to or far from card slot direction；When trimming, first drives retainer to close to the movement of the direction of card slot from the short-term head driving source, be connected to retainer in card slot, the thread cutting mechanism in sewing machine executes trimming action again later.The application is when needing trimming, first pass through the movement of short-term head driving source, it is connected to retainer in card slot, therefore during subsequent trimming, cloth feeding mechanism generates the needle gage of 0-0.5mm, the distance between needle falling hole on the needle gage and last needle pin hole to needle plate of last needle is greatly reduced, to remain in the length of baseline the end of a thread on sewing after greatly shortening trimming, the trimming effect for realizing short-term head, effectively improves the performance of sewing machine.

Description

A kind of secret needle short-term head device of sewing and sewing machine

Technical field

The present invention relates to a kind of secret needle short-term head devices of sewing.

The invention further relates to it is a kind of include above-mentioned sewing secret needle short-term head device sewing machine.

Background technique

Currently, sewing machine complete sew execute trimming when, action sequence are as follows: the eedle of sewing machine is since minimum point It moves up, at this point, the trimming driving source in thread cutting mechanism of sewing machine acts (generally trimming electromagnet, which is powered, is attracted), so that trimming Movable blade in mechanism is mobile, starts trimming, is finally matched by movable blade and stationary knife and cut suture.But from the beginning of During executing trimming action to real cutting this trimming of suture, the main shaft of sewing machine is rotary state, so as to drive Eedle moves up, meanwhile, main shaft also drives the cloth feeding mechanism in sewing machine to act, so that sewing machine during above-mentioned trimming In feed dog be in feeding, that is to say, that sewing has moved forward a certain distance during above-mentioned trimming, this section away from From length be the distance between needle falling hole on last needle pin hole to needle plate on sewing, the end of a thread eventually led on sewing can be more This distance out.Therefore, in view shown in FIG. 1, existing sewing machine remains in the baseline on sewing after automatic shearing The length of the end of a thread is H=A+B+C, wherein A is last needle needle gage；B is between needle falling hole on last needle pin hole to needle plate Distance；C be thread cutting mechanism in stationary knife to eedle distance.There is the high-end clothes industry of strict demand to stub for those For, too long suture the end of a thread can largely effect on beauty, so that the requirement of habilimentation is not achieved in sewing machine performance.

Summary of the invention

In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of secret needle short-term head dresses of sewing It sets, can be realized short-term head trimming effect.

To achieve the above object, the present invention provides a kind of secret needle short-term head device of sewing, including can act on sewing The driving member of cloth feeding mechanism in machine, the card slot being provided on driving member, can be to the stop mobile close to or far from card slot direction Part and the short-term head driving source of driving retainer movement；When trimming, first drive retainer to leaning on from the short-term head driving source The direction of nearly card slot is mobile, is connected to retainer in card slot, the thread cutting mechanism in sewing machine executes trimming action again later.

Further, the driving member is the component backstitched in mechanism or needle gage regulating mechanism in sewing machine.

Further, the mechanism that backstitches includes backstitching driving source, being installed in rotation on backstitching in sewing machine case Handle axis, backstitching connecting plate, backstitch connecting rod, be all fixed on and backstitch the reverse crank of Handle axis and send with fixed swing pivot Expect adjuster, switch connecting rod and switch, it is described to backstitch driving source and be connected with the one end for backstitching connecting plate, it is described to backstitch The both ends of connecting rod are connected with the other end and reverse crank for backstitching connecting plate respectively, the both ends of the switch connecting rod respectively with give Material adjuster be connected with switch, the switch for in sewing machine lower axle and cloth pushing shaft be connected；The driving member Connecting plate is backstitched to be described.

Further, the short-term head driving source is connected by transmission component with retainer；The transmission component includes The push plate for being located at driving member and being fixed on the mounting bracket of baseplate of sewing machine and being connected with short-term head driving source, it is described to stop Moving part is the stop pin shaft being movably threaded through in mounting bracket, and the push plate can be with stop pin shaft backwards to the one of driving member End abuts against.

Further, the short-term head driving source is sucker electromagnet, and the sucker electromagnet can be attracted push plate；Or Person, the short-term head driving source are push-pull electromagnet, and the iron core of the push-pull electromagnet is mutually fixed with push plate.

Further, the push plate includes that the plate main part for being sheathed on baseplate of sewing machine, bending are connected on plate main part The plate interconnecting piece at end and bending are connected to the plate pushing part of plate main part lower end, the plate interconnecting piece and short-term head driving source It is connected, the plate pushing part is abutted against with stop pin shaft；It offers in the plate main part and is led along what push plate moving direction extended To slot, the guider screw that baseplate of sewing machine is matched and be fixed on guide groove is equipped in the guide groove.

Further, the mounting bracket has the bracket vertical plate portion extended vertically；It further include pin shaft bracket, the pin Guide through hole is offered in bracing strut, the stop pin shaft is threaded through in guide through hole and is supported by pin shaft bracket；The pin shaft Bracket is installed on bracket vertical plate portion by position adjusting mechanism, and the position adjusting mechanism makes pin shaft bracket in bracket vertical plate It is adjustable above and below installation site in portion.

Further, circlip is fixed on the stop pin shaft and be arranged with reset spring, the two of the reset spring End is abutted against with pin shaft bracket and circlip respectively.

Further, the position adjusting mechanism includes the first connecting hole being provided in bracket vertical plate portion, is provided with The second connecting hole and eccentric screw on pin shaft bracket, the eccentric screw have first matched with the first connecting hole Interconnecting piece and the second connecting portion matched with the second connecting hole, the first connecting portion and second connecting portion eccentric setting.

Further, the pin shaft bracket includes the bracket main body portion for offering the guide through hole, from bracket main body portion Lower end extend downwardly and offer the bracket adjustment portion of second connecting hole and extend from the two sides of bracket main body portion Bearing attachment, each bearing attachment passes through lock-screw and is connected with bracket vertical plate portion.

Further, the stop pin shaft is fixed with the damping between stop pin shaft and push plate close to one end of push plate Cap.

The present invention also provides a kind of sewing machine, secret needle short-term head dress as described above of sewing is installed in the sewing machine It sets.

As described above, the secret needle short-term head device of sewing of the present invention and sewing machine, have below beneficial to effect Fruit:

The application first passes through the movement of short-term head driving source, is connected to retainer in card slot when needing trimming, therefore rear During continuous trimming (in other words during machine spindle drives eedle to move up this since minimum point), cloth feeding mechanism is produced The needle gage of raw 0-0.5mm, greatly reduce on the needle gage and last needle pin hole to needle plate of last needle between needle falling hole away from From to remain in the length of baseline the end of a thread on sewing after greatly shortening trimming, the trimming effect of realization short-term head is effectively mentioned The performance of high sewing machine.

Detailed description of the invention

Fig. 1 be in the prior art trimming when state diagram.

Fig. 2 is the structural schematic diagram of sewing machine in the application.

Fig. 3 is that the structural schematic diagram after sewing machine case is omitted in Fig. 2.

Fig. 4 is to sew secret needle short-term head device and to backstitch the structural schematic diagram of mechanism in the application.

Fig. 5 is the structural schematic diagram that mechanism is backstitched in Fig. 4.

Fig. 6 to Fig. 8 is structural schematic diagram of the secret needle short-term head device under different perspectives of sewing in Fig. 4.(wherein, Fig. 6 In sewing secret needle short-term head device be in original state, the sewing secret needle short-term head device in Fig. 8 is in work shape State.)

Fig. 9 is the explosive view of Fig. 7.

Figure 10 and Figure 11 is the connection schematic diagram in the application between mounting bracket and pin shaft bracket.

Figure 12 to Figure 14 is action timing diagram when sewing secret needle short-term head device work in the application.

State diagram when Figure 15 is thread cutting mechanism trimming under the action of sewing secret needle short-term head device in this application.

Component label instructions

10 driving members

101 card slots

20 retainers

201 stop pin shafts

30 short-term head driving sources

40 backstitch mechanism

401 backstitch driving source

402 backstitch Handle axis

403 backstitch connecting plate

404 backstitch connecting rod

405 reverse cranks

406 feed regulators

407 switch connecting rods

408 switch

409 backstitch spanner

410 backstitch adjusting bolt

411 springs for governor

412 spring carrier arms

50 mounting brackets

501 bracket vertical plate portions

502 first connecting holes

503 support level plate portions

504 containers

505 sliding slots

60 push plates

601 plate main parts

602 plate interconnecting pieces

603 plate pushing parts

604 guide grooves

70 guider screws

80 pin shaft brackets

801 guide through hole

802 second connecting holes

803 bracket main body portions

804 bracket adjustment portions

805 bearing attachments

806 guiding extensions

90 circlips

110 reset springs

120 lock-screws

130 damping caps

140 eccentric screws

150 electromagnet stents

160 limit plates

170 sewing machine cases

180 baseplate of sewing machine

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 is understood other advantages and efficacy of the present invention easily.

It should be clear that structure, ratio, size etc. that this specification attached drawing is drawn, only to cooperate specification revealed interior Hold, so that those skilled in the art understands and reads, is not intended to limit the invention enforceable qualifications, therefore does 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 not influencing the present invention Under raw effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents can cover.Together When, cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, be merely convenient to chat It states clearly, rather than to limit the scope of the invention, relativeness is altered or modified, and is changing technology without essence It inside holds, when being also considered as the enforceable scope of the present invention.

The application provides a kind of sewing machine, the sewing secret needle short-term head device being especially to provide in one kind sewing machine, Realize the trimming effect of short-term head.For convenient for describing, in following embodiments, all directions are defined as follows: by main shaft in sewing machine Axial direction be defined as left and right directions, and main shaft towards the direction of head be left direction, towards the direction right direction of tail, therefore left and right Direction is the length direction of sewing machine simultaneously；The width direction of sewing machine is defined as front-rear direction, and is sent when sewing machine sewing The direction that cloth tooth drives sewing mobile is front direction；The short transverse of sewing machine is defined as up and down direction.

As shown in Fig. 2 to Fig. 9, the secret needle short-term head device of sewing provided by the present application includes that can act in sewing machine The driving member 10 of cloth feeding mechanism, can move the card slot 101 being provided on driving member 10 to close to or far from 101 direction of card slot Retainer 20 and the mobile short-term head driving source 30 of driving retainer 20.When not needing trimming in sewing process, short-term head Driving source 30 is failure to actuate, and retainer 20 is away from driving member 10, does not abut against with card slot 101, therefore retainer 20 does not pass through transmission For part 10 to cloth feeding mechanism transmitting forces, the cloth feeding mechanism in sewing machine sews sewing with default needle gage.Sewing terminates to need to cut When line, first drives retainer 20 to close to the movement of the direction of card slot 101 from short-term head driving source 30, retainer 20 is made to be connected to card In slot 101, the thread cutting mechanism in sewing machine executes trimming action again later；During trimming or say in machine spindle During driving eedle to move up this since minimum point, since retainer 20 is connected in card slot 101, between retainer 20 plays The effect of limit is connect, therefore retainer 20 transmits position-limiting action to cloth feeding mechanism by driving member 10, so that cloth feeding mechanism is in trimming It does not execute the work feed movement for transferring sewing forward or the sewing for transferring micro distance forward in the process, that is, generates the needle of 0-0.5mm Away from, the distance between needle falling hole on last needle pin hole to needle plate is greatly reduced on the needle gage and sewing of last needle, thus The length for remaining in baseline the end of a thread on sewing after trimming is greatly shortened, the trimming effect of short-term head is realized, effectively improves sewing The performance of machine.

Further, driving member 10 is the component backstitched in mechanism 40 or needle gage regulating mechanism in sewing machine, the portion Part can act on cloth feeding mechanism in sewing machine, metering needle away from size, and the trimming effect of short-term head can be realized.The present embodiment In, driving member 10 is the component backstitched in mechanism 40 in sewing machine, for example backstitches connecting plate to backstitch in mechanism 40 403.Backstitch the preferred structure of mechanism 40 are as follows: as shown in Figure 4 and Figure 5, backstitching mechanism 40 includes backstitching driving source 401, can be rotated Ground is mounted on backstitching Handle axis 402, being articulated with sewing machine case 170 and generally L-shaped backstitch in sewing machine case 170 Connecting plate 403 backstitches connecting rod 404, is all fixed on the reverse crank 405 for backstitching Handle axis 402 and feed regulator 406, switching Device connecting rod 407 and switch 408；The hinge joint composition for backstitching connecting plate 403 and sewing machine case 170 backstitches connecting plate 403 Fixation swing pivot；Backstitching driving source 401 is push-pull electromagnet, backstitches rear end and the company of backstitching of the iron core of driving source 401 The posterior end of fishplate bar 403 is hinged, and the preceding upper end for backstitching connecting plate 403 is hinged with the lower end for backstitching connecting rod 404, backstitches connecting rod 404 Upper end and reverse crank 405 it is hinged, the upper and lower ends of switch connecting rod 407 respectively with feed regulator 406 and switch 408 Hingedly, switch 408 be used for in sewing machine lower axle and cloth pushing shaft be connected.It is fixed in addition, backstitching mechanism 40 and also having Backstitch 402 right end of Handle axis and some be located at outside sewing machine case 170 backstitch spanner 409, with sewing machine case 170 It is threadedly coupled and what front and back extended backstitches adjusting bolt 410 and spring for governor 411；Backstitch adjust bolt 410 front end with The rear end face of feed regulator 406 abuts, and rotation backstitches when adjusting bolt 410 it while can move forward or move back, to adjust feeding Adjuster 406 and the angle for backstitching Handle axis 402；The upper and lower ends of spring for governor 411 respectively with feed regulator 406 and solid Spring carrier arm 412 due to sewing machine case 170 is connected.When needing to backstitch, the energization of driving source 401 is backstitched, driving is backstitched The iron core in source 401, which is attracted, to be moved forward, and drive backstitches connecting plate 403 and fixes swing pivot rotation around it, and then passes through the company of backstitching The drive of bar 404 reverse crank 405 backstitches Handle axis 402 and 406 three of feed regulator rotation, and feed regulator 406 passes through again Switch connecting rod 407 drives switch 408 to rotate, and switch 408 acts on the cloth feeding mechanism in sewing machine, so that sewing function Enough realize backstitches.Therefore, this application involves the work of sewing secret needle short-term head device when, be that short-term head driving source 30 is dynamic first Make, be located at retainer 20 in card slot 101, is to backstitch the movement of driving source 401 again later, so that backstitching mechanism 40 acts on work feed Mechanism, retainer 20 can limit cloth feeding mechanism by backstitching mechanism 40 at this time.

Further, as shown in Figures 6 to 9, short-term head driving source 30 is connected by transmission component with retainer 20；It passes Dynamic component includes being located at the mounting bracket 50 for backstitching at connecting plate 403 and being fixed on baseplate of sewing machine 180 and driving with short-term head The connected push plate 60 in dynamic source 30, retainer 20 are movably to be threaded through in mounting bracket 50 and control the stop pin shaft extended 201；The right end that push plate 60 can backstitch backwards connecting plate 403 with stop pin shaft 201 abuts against, and the driving of short-term head driving source 30 pushes away Plate 60 moves to left, therefore push plate 60 can drive stop pin shaft 201 to be moved to the left to close to the direction for backstitching connecting plate 403, until stop The left end of pin shaft 201 is located in the card slot 101 for backstitching connecting plate 403.Short-term head driving source 30 can select sucker electromagnet, then The energization of sucker electromagnet can be attracted push plate 60, be moved to the left push plate 60, and when sucker electromagnet is not powered on, sucker electromagnetism The space for allowing push plate 60 to be moved to the left is formed between iron and push plate 60.Alternatively, push-and-pull also can be selected in short-term head driving source 30 Formula electromagnet, then the right end of the iron core of push-pull electromagnet is fixed with 60 phase of push plate, push-pull electromagnet be powered after its iron core to Left retraction, and then push plate 60 is driven to be moved to the left.Therefore, in the state that short-term head driving source 30 is not powered on, is failure to actuate, such as scheme Shown in 6, stop pin shaft 201 is away from and backstitches connecting plate 403, not in the card slot 101 for backstitching connecting plate 403, stop pin shaft 201 It will not be by backstitching mechanism 40 to cloth feeding mechanism transmission force；In the state that short-term head driving source 30 is powered, acts, short-term head is driven Dynamic source 30 drives stop pin shaft 201 to be moved to the left by push plate 60, is connected to the left end of stop pin shaft 201 and backstitches connecting plate In card slot 101 on 403, as shown in figure 8, then stop pin shaft 201 can limit cloth feeding mechanism by backstitching mechanism 40.Short-term head drives Electromagnet stent 150 is fixed on by screw in dynamic source 30, and electromagnet stent 150 is fixed on baseplate of sewing machine 180 by screw.

As shown in Fig. 2, Fig. 8 and Fig. 9, push plate 60 includes the plate main part 601 for being sheathed on baseplate of sewing machine 180, bending company Connect in 601 upper end of plate main part and the plate interconnecting piece 602 and bending that extend forward be connected to 601 lower end of plate main part and to The plate pushing part 603 of lower extension, plate main part 601 is in the U-shape being open towards the right side, plate interconnecting piece 602 and short-term head driving source 30 It is connected, plate pushing part 603 is located at the right side of stop pin shaft 201, be used for and the right end of stop pin shaft 201 abuts against.Plate main part The guide groove 604 extended along 60 moving direction of push plate or so is offered in 601, is equipped with and 604 phase of guide groove in guide groove 604 Push plate 60 is connected to baseplate of sewing machine 180 by cooperation and the guider screw 70 for being fixed on baseplate of sewing machine 180, guider screw 70, Preferable guiding role is played to the movement of push plate 60 in the lateral direction simultaneously.Meanwhile guider screw 70 can be with push plate 60 The right end of upper guide groove 604 abuts；When short-term head driving source 30 power-off after push plate 60 move right reset when, pass through guider screw 70 limit the reset position of push plate 60 with the abutting of 604 right end cell wall of guide groove, guarantee the accuracy that push plate 60 resets.In addition, Mounting bracket 50 is L-shaped, and mounting bracket 50 has horizontal-extending support level plate portion 503 and the bracket extended vertically perpendicular Straight plate part 501；The container 504 of 601 lower half portion of plate main part in accommodating push plate 60 is offered in support level plate portion 503, Container 504 runs through support level plate portion 503 to the left.It is installed on the lower end surface in the support level plate portion 503 of mounting bracket 50 Limit plate 160, some is located at the lower end of plate main part 601 limit plate 160, therefore limit plate 160 is for limiting push plate 60 Movement in the up-down direction.More preferably, (i.e. the axle position of this section is long among guider screw 70 for the axle position height of guider screw 70 Degree) it is bigger than the intermediate altitude size (spacing i.e. between two parts up and down of plate main part 601) of push plate 60, so that push plate 60 It is easy to reach the size requirement cooperated with baseplate of sewing machine 180, the requirement to 60 intermediate altitude size of push plate is reduced with this, into And the difficulty of processing of push plate 60 is reduced, avoid technique from wasting.

As shown in Figures 6 to 9, secret needle short-term head device of sewing further includes the pin shaft branch for being used to support stop pin shaft 201 Frame 80, the guide through hole 801 of left and right perforation is offered in pin shaft bracket 80, and stop pin shaft 201 can movably be threaded through and lead Into through-hole 801.More preferably, pin shaft bracket 80 is installed on the bracket vertical plate portion of mounting bracket 50 by position adjusting mechanism 501, position adjusting mechanism keeps pin shaft bracket 80 adjustable above and below the installation site in bracket vertical plate portion 501, stops to adjust The upper and lower position of dynamic pin shaft 201, to adjust the company of backstitching after stop pin shaft 201 is connected in the card slot 101 for backstitch connecting plate 403 The turned position of fishplate bar 403, and then the size in trimming process mid-cut is adjusted, realize the needle gage of 0-0.5mm during trimming. The preferred structure of position adjusting mechanism are as follows: as shown in Figure 10 and Figure 11, position adjusting mechanism includes being provided with bracket vertical plate portion The first connecting hole 502 on 501, the second connecting hole 802 and eccentric screw 140 being provided on pin shaft bracket 80, eccentric spiral shell The second company that nail 140 has the first connecting portion matched with the first connecting hole 502 and matches with the second connecting hole 802 Socket part, first connecting portion and second connecting portion eccentric setting.When needle gage size when adjusting trimming, eccentric screw need to be only rotated 140, operation is very easy.More preferably, it is carried to make pin shaft bracket 80 be able to bear the bigger impact of stop pin shaft 201 Lotus, pin shaft bracket 80 preferably use following structures: pin shaft bracket 80 include offer guide through hole 801 bracket main body portion 803, The bracket adjustment portion 804 of the second connecting hole 802 is extended downwardly and offered from the lower end of bracket main body portion 803 and from bracket The bearing attachment 805 that the front and rear sides of main part 803 are extended along the longitudinal direction respectively, each bearing attachment 805 are logical Lock-screw 120 is crossed to be connected with bracket vertical plate portion 501.In addition, pin shaft bracket 80 is on the left side of bracket main body portion 803 Equipped with guiding extension 806 outstanding to the left, to improve pin shaft bracket 80 to the guiding performance of stop pin shaft 201, and stop can be made Pin shaft 201 bears bigger shock loading.

Further, the concrete operations of the size of trimming process mid-cut are adjusted by above-mentioned position adjusting mechanism are as follows: 1, It adjusts bolt 410 manually and turns to the position of required needle gage (0-0.5mm) backstitching, such as: 0 needle gage, 0.1mm needle gage, 0.5mm Needle gage etc., at this point, the position for backstitching connecting plate 403 is exactly corresponding required needle gage position；2, push stop pin shaft 201 to most manually Left end, while unscrewing lock-screw 120；3, rotation eccentric screw 140 makes stop pin shaft 201 and backstitches the card on connecting plate 403 Slot 101 contacts；4, lock-screw 120, fixed entire pin shaft bracket 80 are tightened, the position of such stop pin shaft 21 is exactly corresponding institute Need the position of needle gage.In subsequent trimming, short-term head driving source 30 be first powered actuation, so that stop pin shaft 201 is connected to the company of backstitching In the card slot 101 of fishplate bar 403, the energization of driving source 401 is backstitched later and is attracted, makes to backstitch the rotation of connecting plate 403, backstitches connecting plate The needle gage that 403 turned position generates is the corresponding required needle gage adjusted, to realize the needle gage of 0-0.5mm during trimming. Therefore, the upper and lower position of stop pin shaft 201 is adjusted by eccentric screw 140 by the application, to carry out needle gage adjusting, operates non- It is often convenient, and eccentric screw 140 can also make entire pin shaft bracket 80 be able to bear shock loading up and down, improve stability.

As shown in Figures 6 to 9, circlip 90 is fixed on stop pin shaft 201 and is arranged with reset spring 110, reset bullet The left and right ends of spring 110 are abutted against with pin shaft bracket 80 and circlip 90 respectively.Push plate 60 is driven when short-term head driving source 30 is powered After being moved to the left, reset spring 110 is compressed；Therefore after the power-off of short-term head driving source 30, energy under the action of reset spring 110 Enough push plate 60 and stop pin shaft 201 is driven to move right, reset.Meanwhile stop pin shaft 201 is fixed with close to the right end of push plate 60 Damping cap 130 between stop pin shaft 201 and push plate 60, by damping cap 130 can reduce to the left push push plate 60 and Push plate 60 moves right the noise in reseting procedure.

In the above-mentioned sewing machine for being equipped with secret needle short-term head device of sewing, short-term head driving source 30 backstitches driving source 401 All it is connected with the electronic control module in sewing machine with the trimming driving source in thread cutting mechanism, is automatically controlled with realizing.

By taking short-term head driving source 30 selects sucker electromagnet as an example, the working principle for secret needle short-term head device of sewing is chatted It states as follows: when not needing trimming, i.e., under the original state for secret needle short-term head device of sewing, as shown in figure 12, sucker electromagnetism Iron is in off-position, and push plate 60 is located at the right end in its stroke range, and the plate pushing part 603 of 60 lower end of push plate, which is connected to, to be subtracted The right end of cap 130 is shaken, stop pin shaft 201 is not moved to the left, therefore the left end of stop pin shaft 201 is not located at and backstitches on connecting plate 403 In card slot 101 on end face, stop pin shaft 201 will not generate limit to connecting plate 403 is backstitched, and sewing machine is with default needle gage along seam Or it backstitches.When needing trimming and realizing short-term head effect, the operation panel first passed through in sewing machine opens short-term greatest service energy；Work as knot When beam sewing starts trimming, post legged pedal, then the governor in sewing machine generates signal and is input in electronic control module, automatically controlled mould Block first controls the energization of sucker electromagnet after receiving signal, then sucker electromagnet, which is powered, generates magnetic force, is attracted push plate 60, makes push plate 60 are moved to the left, and push plate 60 pushes stop pin shaft 201 to be moved to the left, stop pin shaft 201 be moved to the left that push plate 60 moved away from From then the left end of stop pin shaft 201 and the cell wall of the card slot 101 backstitched on connecting plate 403 abut against, as shown in figure 13.Later, Electronic control module in sewing machine controls again backstitches electromagnet energization, and the iron core for backstitching electromagnet, which is pulled along, backstitches connecting plate 403, It is started turning so that backstitching connecting plate 403, but due to the limit of stop pin shaft 201, prevent backstitching connecting plate 403 from upward again It rotates, backstitch the rotation that connecting plate 403 is limited, and backstitches connecting plate 403 and can only generate the needle gage of 0-0.5mm, such as Figure 14 institute Show.The 1-2 needle finally, the electric control module controls spindle motor in sewing machine is walked, then in electric control module controls thread cutting mechanism Purl function is realized in the movement of trimming driving source, in this way last needle, and during trimming, since stop pin shaft 201 abuts Connecting plate 403 is backstitched, limit indirectly is generated to cloth feeding mechanism by backstitching mechanism 40, therefore the cloth feed amount of feed dog work feed forward is The needle gage of 0-0.5mm.Further, by Fig. 1 and Figure 15 comparison it is found that the application will by secret needle short-term head device of sewing Distance A and distance B in Fig. 1 are reduced into the needle gage of 0-0.5mm, thus the application finally by the A+B in Fig. 1 this segment length substantially Degree ground is reduced into D this segment length in Figure 15, D=0-1mm so that be equipped with this application involves sewing secret needle short-term head fill The length for setting the baseline the end of a thread remained on sewing after trimming is D+C, to remain on sewing after greatly shortening trimming The length of baseline the end of a thread reaches the short-term head, effectively improves the performance of sewing machine.

In conclusion this application involves sewing secret needle short-term head device have the advantage that

1, when short-term head driving source 30 selects sucker electromagnet, push plate 60 is realized in sucker electromagnetic actuation push plate 60 It moves to left, for short-term head driving source 30 selects push-pull electromagnet, sucker electromagnet is smaller in volume, occupied space Less, increased structure slot milling can be wanted to be subsequent, and cost is lower.

2, the application uses the control method limited indirectly, makes to backstitch the switch 408 in mechanism 40 and is constantly in zero Needle gage position, limit control is small to the change of part original in sewing machine indirectly, and does not tie up the installation position of other parts It sets, does not also need sewing machine case 170 and baseplate of sewing machine 180 being designed to parts peculiar, to improve versatility.

3, short-term head driving source 30 → push plate, 60 → latch is used between short-term head driving source 30 and stop pin shaft 201 The driving of axis 201, rather than the driving of short-term head 30 → stop of driving source pin shaft 201 can avoid stop pin shaft 201 directly to short The impact of the end of a thread driving source 30 improves the service life of short-term head driving source 30.

4, the application overall volume is smaller, and cost is lower, and installation and debugging are also more convenient.

So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.

The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as At all equivalent modifications or change, should be covered by the claims of the present invention.

Claims (12)

1. a kind of secret needle short-term head device of sewing, it is characterised in that: the biography including can act on cloth feeding mechanism in sewing machine Moving part (10), can stop the card slot (101) being provided on driving member (10) to close to or far from card slot (101) direction is mobile Moving part (20) and the short-term head driving source (30) of driving retainer (20) movement；When trimming, first by the short-term head driving source (30) driving retainer (20) is mobile to the direction close to card slot (101), is connected to retainer (20) in card slot (101), it The thread cutting mechanism in sewing machine executes trimming action again afterwards.

2. the secret needle short-term head device of sewing according to claim 1, it is characterised in that: the driving member (10) is sewing A component in mechanism (40) or needle gage regulating mechanism is backstitched in machine.

3. the secret needle short-term head device of sewing according to claim 2, it is characterised in that: the mechanism (40) that backstitches includes It backstitches driving source (401), be installed in rotation on backstitching Handle axis (402), there is fixed swing in sewing machine case (170) Fulcrum backstitch connecting plate (403), backstitch connecting rod (404), be all fixed on the reverse crank (405) for backstitching Handle axis (402) and Feed regulator (406), switch connecting rod (407) and switch (408), it is described to backstitch driving source (401) and connect with backstitching One end of plate (403) is connected, the both ends for backstitching connecting rod (404) respectively with the other end and reversion that backstitch connecting plate (403) Crank (405) be connected, the both ends of the switch connecting rod (407) respectively with feed regulator (406) and switch (408) phase Even, the switch (408) be used for in sewing machine lower axle and cloth pushing shaft be connected；The driving member (10) is fallen described in being It stitches connecting plate (403).

4. the secret needle short-term head device of sewing according to claim 1, it is characterised in that: the short-term head driving source (30) It is connected by transmission component with retainer (20)；The transmission component includes being located at driving member (10) and being fixed on sewing machine The mounting bracket (50) of bottom plate (180) and the push plate (60) being connected with short-term head driving source (30), the retainer (20) are The stop pin shaft (201) being movably threaded through in mounting bracket (50), the push plate (60) can carry on the back with stop pin shaft (201) It is abutted against to one end of driving member (10).

5. the secret needle short-term head device of sewing according to claim 4, it is characterised in that: the short-term head driving source (30) For sucker electromagnet, the sucker electromagnet can be attracted push plate (60)；Alternatively, the short-term head driving source (30) is plug-type The iron core of electromagnet, the push-pull electromagnet is connected with push plate (60).

6. the secret needle short-term head device of sewing according to claim 4, it is characterised in that: the push plate (60) includes being arranged In the plate main part (601) of baseplate of sewing machine (180), bending be connected to plate main part (601) upper end plate interconnecting piece (602), And bending is connected to the plate pushing part (603) of plate main part (601) lower end, the plate interconnecting piece (602) and short-term head drive Source (30) is connected, and the plate pushing part (603) abuts against with stop pin shaft (201)；Edge is offered in the plate main part (601) The guide groove (604) that push plate (60) moving direction extends, be equipped in the guide groove (604) matched with guide groove (604), And it is fixed on the guider screw (70) of baseplate of sewing machine (180).

7. the secret needle short-term head device of sewing according to claim 4, it is characterised in that: the mounting bracket (50) has The bracket vertical plate portion (501) extended vertically；Further include pin shaft bracket (80), it is logical that guiding is offered in the pin shaft bracket (80) Hole (801), the stop pin shaft (201) are threaded through in guide through hole (801) and are supported by pin shaft bracket (80)；The pin shaft Bracket (80) is installed on bracket vertical plate portion (501) by position adjusting mechanism, and the position adjusting mechanism makes pin shaft bracket (80) adjustable above and below the installation site on bracket vertical plate portion (501).

8. the secret needle short-term head device of sewing according to claim 7, it is characterised in that: on the stop pin shaft (201) Be fixed with circlip (90) and be arranged with reset spring (110), the both ends of the reset spring (110) respectively with pin shaft bracket (80) it is abutted against with circlip (90).

9. the secret needle short-term head device of sewing according to claim 7, it is characterised in that: the position adjusting mechanism includes The first connecting hole (502) being provided on bracket vertical plate portion (501), the second connecting hole being provided on pin shaft bracket (80) (802) and eccentric screw (140), the eccentric screw (140) have match with the first connecting hole (502) first to connect Socket part and the second connecting portion matched with the second connecting hole (802), the first connecting portion are set with second connecting portion bias It sets.

10. the secret needle short-term head device of sewing according to claim 9, it is characterised in that: pin shaft bracket (80) packet Include and offer the bracket main body portion (803) of the guide through hole (801), extended downwardly from the lower end of bracket main body portion (803) and It offers the bracket adjustment portion (804) of second connecting hole (802) and extends from the two sides of bracket main body portion (803) Bearing attachment (805), each bearing attachment (805) pass through lock-screw (120) and bracket vertical plate portion (501) phase Connection.

11. the secret needle short-term head device of sewing according to claim 4, it is characterised in that: the stop pin shaft (201) is leaned on One end of nearly push plate (60) is fixed with the damping cap (130) between stop pin shaft (201) and push plate (60).

12. a kind of sewing machine, it is characterised in that: be equipped with the described in any item sewing machines of claim 1-11 in the sewing machine Close needle short-term head device.