CN1400349A

CN1400349A - Sewing machine, especially buttonhole-lockstitching sewing machine, with string fastening and cutting device

Info

Publication number: CN1400349A
Application number: CN02123893A
Authority: CN
Inventors: T·埃林豪韦恩; B·波法拉
Original assignee: Duerkopp Adler AG
Current assignee: Durkep Adler Co ltd
Priority date: 2001-07-26
Filing date: 2002-07-08
Publication date: 2003-03-05
Anticipated expiration: 2022-07-08
Also published as: KR100443144B1; CN100365188C; KR20030010538A; DE10136543C1; JP2003053080A; JP3950758B2

Abstract

The sewing machine, especially a buttonhole sewing machine, is provided with needle thread holding scissors (43) having a lower half body (50) with a cutting edge at the end. The needle thread holding scissors also includes an upper half body (54) which has a cutting edge at the end and is attached to the lower half body (50) so as to be rotatable The needle thread holding scissors also includes a clamp jaw (64) to be elastically pressurized against the end part of the upper half body (54) so that the tailpiece of a needle thread (75) is kept to be fastened. The scissors (43) are rotatable between a work position and a side position by a rotation driving part (22). A closure driving part (23) solely rotates the upper half body (54) from an open position to a closed position.

Description

The Sewing machines of the tight and shearing device of the wire clamp of threading with seam is the bonnet lock hole Sewing machines particularly

Technical field

The present invention relates to a kind of Sewing machines, particularly snap close (button) hole Sewing machines (Knopfloch-Naehmaschine) with sewing thread clamping and shearing device.

Background technology

By DE 19722504 C1 (corresponding to US5,931,106) known such one type Sewing machines, particularly bonnet lock hole Sewing machines,

-with a pin that can drive up and down along tracks,

-be with a shuttle,

-be with a sewing product pressure strip, with in the sewing process under pin fixing and guiding sewing product,

--pressure strip has a hole, so that in producing the linear slit process, pin is passed through,

-with a drive unit that is used for the sewing product pressure strip,

-be with a sewing thread to clamp and shearing device,

--it has a sewing thread clamping-cutter, its band

---have the blade in tip region cutter under part,

---one can with respect to part under the cutter around the cutter hinge rotating with the cutter of blade in tip region on part and

---one can flexibly be pressed on the jaw on the tip region of part on the cutter, with clamp fixing the end of a thread of sewing thread, and it

---an occupy work station, be located substantially at least at this position upper knife edge the sewing product pressure strip the hole above,

-band drive unit, so that part turns round with respect to part under the cutter on the cutter,

--from one first deployed position,

The movement locus of pin of---on this position is passed in the admittance opening that is used for sewing thread that forms between the blade,

The tip region of part of---on this position cutter is left jaw,

--arrive one second closing position,

---this position tip region to small part overlapped and

The tip region of the part of---on this position cutter and jaw bite with clamp silk thread and

-band is used for making sewing thread clamping-cutter to be turned back to the device of dodging the position from the operating position of blade on the hole.

The actuation movement that is used for handling sewing thread clamping-cutter in known Sewing machines is drawn from a control cam or from a shuttle wire cutter.This means the control technology association, make that the movement relation of the process optimization on the sewing thread clamping-cutter is not to realize without difficulty.The manufacturing of transmission device, installation and adjustment (expense) are considerable.Because it also is easy to wearing and tearing its complicated structural design.Because in order to realize that drive unit needs numerous parts, this also impairs reliability of operation.Mechanical component need maintain and lubricate in addition.

The objective of the invention is, improve the Sewing machines of this type in this wise, thereby making to reach simplifies and the expense minimizing, and the improvement of operational reliability.

Realize according to the feature of this purpose of the present invention by claim 1.For the present invention importantly, sewing thread clamping-cutter has only two positions to control, and this can realize by two drive units that can control independently of each other, very simple.Can reduce the quantity of required member thus, thereby reduce wear, also have the reduction expense.Cause the raising of operational reliability in addition.Good organization plan is obtained by dependent claims.

Description of drawings

By means of accompanying drawing embodiments of the invention are done more detailed explanation below.Accompanying drawing is represented:

Fig. 1 one is used for stitching the rearview of the bonnet lock hole Sewing machines of underwear (Waesche) bonnet lock hole;

Fig. 2 Sewing machines part is pressed the enlarged drawing of observing arrow II among Fig. 1;

The side view of observing arrow III among Fig. 2 is pressed in the zone shown in Fig. 3 Fig. 2;

Zone shown in Fig. 4 Fig. 3 is pressed and is observed arrow IV vertical view among Fig. 3, represents that wherein sewing thread clamping-cutter is arranged in first deployed position of dodging the position;

Fig. 5 one represents wherein that corresponding to the view of Fig. 4 sewing thread clamping-cutter is arranged in second closing position of an operating position;

Zone shown in Fig. 6 Fig. 5 is with respect to turn clockwise 90 ° the cutaway view by subdivision line VI-VI among Fig. 5 of Fig. 5;

Fig. 7 presses the view of observing arrow VII among Fig. 3, the local disconnection;

The view that Fig. 8 part changes to some extent corresponding to the sewing thread clamping-cutter position of Fig. 7;

The partial enlarged drawing of Fig. 9 Fig. 5 wherein is seamed into initial zigzag needle tracking at the end of a thread place;

Figure 10 one represents wherein that corresponding to the view of the bonnet lock hole that has stitched having of Fig. 9 sewing thread clamping-cutter is arranged in second closing position of its operating position, before sewing thread clamping-cutter is carried out its cut-out function;

Figure 11 sewing thread clamping-cutter is by the view when the sewing thread cutting-off process begins of observing arrow XI among Fig. 5;

Figure 12 is corresponding to the view of Figure 11, and wherein sewing thread is cut off, and its end of a thread is clamped.

The specific embodiment

As seen from Figure 1, one makes the needle tracking group Sewing machines of double-lock type stitch sewing machine, and is the bonnet lock hole Sewing machines, and it makees to such an extent that be used for making underwear (Waesche) bonnet lock hole especially, has a horn 1 and a housing shape base plate 2 usually.Can be bearing in the

bearing

5,6 by the arm axle 4 that a drive motors 3 rotations drive in arm 1, it can drive the shank 8 of a band pin 9 that can vertically support movably by a crank mechanism 7 up and down, that is to say in the movement locus driving along a straight line of Z direction.There is unillustrated, a well-known pin oscillatory gearing mechanism in addition,, can produces the zigzag needle tracking that for example is used for the bonnet lock hole linear slit by means of it to produce a pin oscillating motion.

In base plate 2, can support a shuttle (Greifer) 10 with a unillustrated shuttle line supplying rotatably around one 11.Usually draw from arm axle 4 on the synchronized movement of the driving of shuttle 10 and shank 8 ground.The structure example of shuttle 10 and shuttle wire cutter is as carrying out like that with described shown in DE 19722504 C1 (corresponding to US 5,931,106).

Form a panel 12 on base plate 2 upsides under the shank 8, sewing product 13 can guide on this panel and mobile by means of pressure strip 14.For being moved along directions X, pressure strip 14 is provided with a pressure strip drive unit 15.It has a planker 16 that is installed in the horn 1, and it can move at a guide rail 17 upper edge directions Xs.Planker 16 is connected with pressure strip 14 by means of a connecting rod 18.The driving of planker 16 is undertaken by a cog belt drive unit 20 by a stepper motor 19.

There is a sewing thread to clamp and shearing device 21 on shank 8 next doors along the Y direction, also will does detailed explanation below it.It has two can pneumatic loaded piston-

cylinder driver

22,23, and they can load by the

electromagnetic valve

25,26 that is equipped on central control unit 24.

Electromagnetic valve

25,26 is supplied with compressed air by a unillustrated compressed air source by compressed air supply pipe 27.

Drive unit

22,23 is connected with

valve

25,26 by flexible compressed

air input pipe

28,29.

The control of

electromagnetic valve

25,26 is undertaken by corresponding

electric controling line

31,32 by means of a micro-processor control device 30 that belongs to control module 24.Same drive motors 3 and stepper motor 19 are controlled by control

corresponding line

33,34 by control device 30.

Especially as seen from Figure 2, Sewing machines have one be bearing in the horn 1, can be vertically, that is to say the lining depression bar 35 that can move along the Z direction, it drives with common, unillustrated method and carries out.Lining depression bar 35 and shank 8 are arranged in parallel.

On the lower end of lining depression bar 35, fix a supporting mass 36 with trip bolt 37.Can be fixed on the bearing pin 39 in a pinch rollers 38 on the supporting mass 36 with rotating freely.Be directed downwards when motion pinch rollers 38 at lining depression bar 35 towards base plate 2 and contact with pressure strip support 40, this support one end is installed on the connecting rod 18, and the other end is connected with pressure strip 14 by a connection lever 41.That is to say that when lining depression bar 35 is done described moving downward pressure strip 14 compresses and is fixed on the panel 12 of base plate 2 together with the sewing product 13 that is positioned at below it.In pressure strip 14, be provided with one along the hole 42 that directions X extends, so that pin 9 passes.

On this external horn 1 a bonnet lock hole shearing device can also be set, it is for example by known to DE 19722504 C1 (corresponding to US5,931,106) that mentioned.

Other accompanying drawing sewing thread clamping and shearing device 21 by Fig. 2 and back have a sewing thread clamping-cutter 43, and it can be bearing on the supporting mass 36 pivotally around the axle 45 that a directions X extends under the situation of centre connection single-revolution lever 44.Revolution cutter 43 by pivoted lever 44 can (Fig. 2,3,5) moves to one and dodges position (Fig. 4) from the operating position along the Y direction, or turns around.Make pivoted lever 44 revolutions by means of a lever 46 that is installed on the axle 45, by a drive unit of mentioning 22,23, just device for revolving and driving 22 applies active force to lever 46 again for this reason.This device for revolving and driving 22 is made a piston-cylinder drive unit with the one-sided effect of a piston 47, piston be contained on the supporting mass 36 as the cylinder of drive unit 22 in lever 46 open blind holes 48.Affiliated flexible compressed air input pipe 28 feeds in these blind holes 48.Piston 47 directly leans against on the lever 46.For pivoted lever 44 is resetted, adopt one by one that end is contained on the supporting mass 36 thereby make cutter 43 get back to the operating position, the other end is contained on the cutter 43, makes the back-moving spring 49 of the pretension of coil expander.

Cutter 43 has part 50 under the cutter, on the lower end relative that it is hinged on pivoted lever 44 by means of a fork-shaped supporting arm 51 and a supporting shaft 52 with axle 45, its axis 45 and supporting shaft 52-as seen from Figure 2-in the overlapped setting of Z direction.Part 50 has an additional arm 53 under the cutter, and back-moving spring 49 hangs on the arm.

Part 54 is hinged under the cutter on the part 50 by means of a cutter hinge 55 on one cutter.Cutting off

device

50,54 has a

blade

56,57 respectively in its tip region, they can cut off motion mutually under the situation of carrying out cutting-off process.Has

elongated tip region

58,59 respectively at

blade

56,57 regional internal cutting off devices 50,54.The fastening spring 60 of leaf spring form is made in installation one on part on the cutter 54, and it is connected with cut-out

device

50,54 by means of cutter hinge 55 equally.It can not around cutter hinge 55 with respect to cutter under part 50 revolutions.For this reason it to be contained under the cutter steady pin on the part 50 61 by means of one fixing, this steady pin passes on the cutter that a foot moves big hole 62 on the part 54, and embeds in the slotted hole 63 on the fastening spring 60.Hole 62 on the cutter on the part 54 is big like this, makes that part 54 on the cutter upwards can be with respect to part 50 revolutions under can not rotating cutter in week of necessity.Fastening spring 60 its dorsad steady pin 61, on the end of

tip region

58,59, have a class pawl 64.

As one side by Fig. 4,9,10 on the other hand as seen from Figure 5, part 54 occupies two positions with respect to part under the cutter 50 on the cutter, just a closing position (Fig. 5) and a deployed position (Fig. 4,9,10).That had mentioned is used for making cutter 43 closures as the drive unit 23 of closed drive unit 23, that is to say to make that part 54 is turned back in the closing position shown in Fig. 5 on the cutter.This drive unit also is a kind of one-sided apply piston cylinder driver.Its piston 65 can be on supporting mass 36 one constitutes in the blind hole 66 of cylinder and moves along directions X.Flexible compressed air input pipe 29 also feeds in the blind hole 66.Piston 65 has a guide section that stretches out 67 from blind hole 66, it can move in the stub area of the blind hole dorsad 66 of a bearing 8 that forms in supporting mass 36.On guide section 67-determine a backstop 69 near blind hole 66-by means of a hold-down screw 70.Backstop 69 can move along directions X, and the revolution of part 54 makes cutter 43 closures on being used for when closed drive unit 23 feeds compressed air by cutter.On guide section 67 between bearing 68 and the backstop 69, adorn the compression spring of a pretension, it as piston 65 together with the back-moving spring 71 of backstop 69 movably.Backstop 72 along Y direction fixed-site after backstop 69 movably is screwed on supporting mass 36.

Part 54 has the arm 73 of the bending of a band draw pin 74 on the cutter.For cutter 43 is closed be incorporated under the situation that closed drive unit 23 correspondingly loads backstop 69 act on this draw pin and on the cutter part 54 from being turned back to the closing position shown in Fig. 5 in the deployed position shown in Fig. 4.Cutter 43 be turned back to from the operating position shown in Fig. 5 shown in Fig. 4 dodge the position time draw pin 74 contact with the backstop 72 of fixed-site, make thus that part 54 is turned back to its deployed position again on the cutter.

Operation principle is as follows:

Sewing product clamps or is pressed between pressure strip 14 and the panel 12 after sewing product 13 being placed on panel 12 and making pressure strip 14 drop on the sewing product 13 by means of lining depression bar 35.These hour hands 9 are positioned at pressure strip 14 tops.Sewing thread 75 by pin 9 guiding extends to

tip region

58,59 directions of cutter 43, and cutter 43 is in the closure state in the operating position, as shown in Figure 5.In addition as seen from Figure 5, the cutter 43-that schematically illustrates out there is with respect to after the sewing system device throughput direction that distributes along directions X-the be positioned at pin 9.That is to say that throughput direction can be interferes with pin 9.

Along with starting of Sewing machines, that is to say beginning along with the sewing process, carry out first needle tracking 76 in a zigzag, as schematically illustrating among Fig. 9.Because pressure strip 14 moves along the directions X average rate along the feed motion sewing product 13 of directions X.Thus at the end of a thread 78 lap seams (Uebernaeht) that produce first sewing thread 75 that extends to the

tip region

58,59 of cutter 43 from the pinprick 77 of pin 9 during needle tracking 76 in a zigzag needle tracking 76 in a zigzag.Because sewing product 13 is also pulled out along directions X along the end of a thread 78 that moves of directions X, makes it also overlapping with zigzag needle tracking 76 actually.Before the end of a thread 78 and zigzag needle tracking 76 complete lap seams, control device 30 impels device for revolving and driving 22 startings, and piston 47 is shifted out from blind hole 48, makes cutter 43 integral body be turned back to it again in the position of dodging shown in Fig. 9 thus.The draw pin 74 of part 54 contacts with the backstop 72 of fixed-site on the cutter when this gyration, makes simultaneously thus that part 54 is turned back to its deployed position by Fig. 9 on the cutter.Because movably backstop 69 is pressed the retracted position of Fig. 3 at it, so can realize this opening movement.In Fig. 9 expression during this period with the end of a thread 78 of zigzag needle tracking 76 complete lap seams.Bonnet lock hole linear slit 79 is made by another zigzag needle tracking 76 of generation and two reinforcing linear slits (Naht-riegel) 80,81 and is finished now, as shown in Figure 10.Before linear slit be about to stop, make device for revolving and driving 22 releases, make open cutter 43 dodge the back-moving spring 49 of position by tensioning and be turned back to its operating position, as shown in Figure 10 from it by control device 30.At this moment the process of sewing can be moved to end, because pin 9 can be passed in the admittance opening 56a that forms between the

blade

56,57 of part 54 on the part 50 and cutter under the cutter.Blade 57-is with respect to directions X-be positioned at a side of pin 9, and blade 56 is positioned at the opposite side of pin 9.

Finish in the sewing process, after just Sewing machines was shut down, the compressed air by closed drive unit 23 loaded and cuts off sewing thread 75, made on the cutter part 54 arrive its closing positions by backstop 69 movably thus, as shown in Figure 5.Because cutter 43 is in the zone in the hole 42 of extremely thin pressure strip 14, the cut-out of sewing thread 75 is with very little distance, and the 0.5mm place carries out about sewing product 13 top.Obtain cutting off program with clamping process by Figure 11 and 12, wherein Figure 11 represents that sewing thread 75 cut off when not long ago closing course began, and Figure 12 represents to have the cutter 43 of closure of the end of a thread 78 of the sewing thread 75 of clamping.

If rise now and will produce another bonnet lock hole linear slit 79, sewing product 13 is moved with respect to pin 9 along directions X, the end of a thread 78 of sewing thread 75 is arranged in the opposite direction with respect to sewing product 13, thus-as already mentioned like that-it can clearly be covered and lap seam by first zigzag needle tracking 76.Therefore the end of a thread is arranged along directions X, that is to say, dodges the position if cutter 43 is turned back to from the operating position, and it just no longer reverses so, and cutter 43 is opened.

Claims

1. Sewing machines, particularly bonnet lock hole Sewing machines,

-with a pin (9) that can drive up and down along tracks,

-be with a shuttle (10),

-be with a sewing product pressure strip (14), in the sewing process, fixing and to guide sewing product (13) in the below of pin (9),

--it has one and be used for hole (42) that pin (9) is passed through when producing linear slit (79),

-with a drive unit (15) that is used for sewing product pressure strip (14),

-be with a sewing thread to clamp and shearing device (21),

--it has a sewing thread clamping-cutter (43), its band

---one has part (50) under the cutter of a blade (56) in tip region (58),

---one in tip region (59), have a blade (57) can around a cutter hinge (55) with respect to the rotating cutter of part under the cutter (50) on part (54) and

---be provided with one can flexibly be pressed on the jaw (64) on the tip region (59) of part on the cutter (54), with clamp fixing the end of a thread (78) of sewing thread (75), and it

---occupy one, the operating position was located substantially on the top in the hole (42) on the sewing product pressure strip (14) at least at this position upper knife edge (56,57),

-band is used for making part on the cutter (54) with respect to the rotating drive unit of part under the cutter (50),

--from one first deployed position,

---pass an admittance opening (56a) that is used for sewing thread (75) that between blade (56,57), forms at the movement locus of pin (9) on this position,

---and on this position cutter the cusp field (59) of part (54) leave jaw (64),

--enter one second closing position,

---this position tip region (58,59) overlap at least mutually and

The tip region (59) of the part (54) of---on this position cutter and jaw (64) clamp chimeric and

-band is used for making sewing thread clamping-cutter (43) to be turned back to the device of dodging the position from the operating position of blade (56,57) on hole (42),

It is characterized by:

The rotating drive unit of part on the cutter (54) is made only be used for making part on the cutter (54) to be turned back to the closed drive unit (23) of the closed second place from open primary importance, this drive unit acts on the part on the cutter (54) by means of a backstop (69) that movably is used for closed amputation device (43), and be used for that the rotating drive unit of sewing thread clamping-cutter (43) (15) is made and only be used for that cutter (43) is turned back to from the operating position device for revolving and driving (22) of dodging the position, wherein be provided with the backstop (72) of a fixed-site, part on the cutter (54) contacts with this backstop being turned back to from the operating position when dodging the position, here the backstop of fixed-site (72) is provided with in this wise, make that part on the cutter (54) contacts with this backstop when the tip region (59) of part on the cutter (54) is left pin (9).

2. by the described Sewing machines of claim 1, it is characterized by: device for revolving and driving (22) and/or closed drive unit (23) are made can pneumatic loaded piston cylinder driver.

3. by the described Sewing machines of claim 2, it is characterized by: at least one piston-cylinder drive unit is made one-sided effect.

4. by the described Sewing machines of claim 1, it is characterized by: be turned back to the operating position and be provided with a back-moving spring (49) from dodging the position in order to make cutter (43).

5. by the described Sewing machines of claim 1, it is characterized by: be provided with a back-moving spring (71) that is used for making backstop (69) movably to return.

6. by the described Sewing machines of claim 1, it is characterized by: part on the cutter (54) is provided with a draw pin (74), and it leans against movably on the backstop (69) on the one hand, leans against on the other hand on the backstop (72) of fixed-site.

7. by the described Sewing machines of claim 1, it is characterized by: sewing thread clamping-cutter (43) is installed on the supporting mass (36), and drive unit (22,23) is made on the supporting mass (36).

8. by the described Sewing machines of claim 2, it is characterized by: piston-cylinder drive unit is made in the supporting mass.