CN1147039A

CN1147039A - Yarn cut-off device for chain stitch sewing machine and its drive

Info

Publication number: CN1147039A
Application number: CN 96106024
Authority: CN
Inventors: 田岛郁夫; 铃木悟; 水口洋一
Original assignee: Tokai Kogyo Sewing Machine Co Ltd
Current assignee: Tokai Kogyo Sewing Machine Co Ltd
Priority date: 1995-03-14
Filing date: 1996-03-14
Publication date: 1997-04-09
Anticipated expiration: 2016-03-14
Also published as: CN1049940C; DE19655324B4

Abstract

The invention relates to a yarn cut-off device of a chain stitch sewing machine, in which the upper part of a gearbox 11 arranged below the sewing machine head is provided with a yarn cut-off device 50. A movable body 53 in the formation of the yarn cut-off device is opposite to a ferrule mechanism 17 arranged on the front of the gearbox, which can be freely installed through the upper surface of the movable body. In addition, in the position that the movable body passes through, the retaining plates 64 in wedge-shaped bending are arranged and corresponded to each ferrule mechanism. After the yarn led out from the ferrule mechanism is cut off through the movable body, when the movable body moves back, the yarn is stretched from the ferrule mechanism along the removed direction. When the ferrule mechanism passes through the retaining plates, the cut-off part of the sewing yarn is hanged between the retaining plates.

Description

The wire-cutting device of chain sitch sewing machine and drive unit thereof

The present invention relates to a kind of by the Sewing needles that drives up and down and the co-operating of the loop taker of the rotation control simultaneously chain sitch sewing machine wire-cutting device that carries out the chain-type stitch sewing with it, in addition, another invention of the application provides a kind of shank of configuration on each of a plurality of sewing machine heads and drive unit that the compress pin carries out the multi-head sewing machine of lifting action of making.

For the wire-cutting device of known chain sitch sewing machine in the past, be disclosed the sort of technology in for example special fair 3-11239 communique.In this communique.By allowing movable body that the top gap of following and loop taker of needle plate does the advance and retreat motion and the co-operating that is fixed on the fixed body below the needle plate, the yarn shut-off mechanism that sewing thread and yarn is cut off.And for other wire-cutting device, then open in the flat 5-239757 communique the spy, disclose that seam is cut off the shape shut-off mechanism and the sewing thread and yarn guide mechanism that cuts off by this shut-off mechanism and will cut off after the maintaining body that keeps of sewing thread and yarn.

The disclosed wire-cutting device of special fair 3-11239 communique does not have the mechanism that the end that will remain in the sewing thread and yarn of loop taker one side after the sewing thread and yarn cut-out remains on preposition.Like this, when sewing, when hanging over sewing thread and yarn on the Sewing needles owing to the rotation of loop taker, move along with the rotation of loop taker the yarn end of this sewing thread and yarn.Thereby, can not apply tension force on the sewing thread and yarn, Sewing needles just can not hang up this sewing thread and yarn well, thereby defectives such as crack can occur.

And the special disclosed wire-cutting device of flat 5-239757 communique of opening has the mechanism that the yarn end that will remain in loop taker one side after yarn cuts off keeps, yet the number that constitutes this mechanism is very many, complex structure, thereby manufacturing expense is high and have a defective of action accuracy difference.

In multi-head sewing machine, the drive unit that allows shank that most sewing machine heads are disposed above each and presser feet carry out lifting action be with the axle that is fixed on machine spindle on needle-bar cam and the revolution of presser feet cam interlock mutually, make shank drive rod and the reciprocating motion in certain scope of presser feet drive rod, thus, make shank and presser feet do lifting action respectively.Like this, changing under the situation that cloth etc. must avoid shank and presser feet, allow with yielding mechanism move, above-mentioned each drive rod is rotated the position of top dead-centre when shank and presser feet being kept out of the way surmount sewing to the top that surpasses above-mentioned preset range.

Yet under shank and the presser feet state after keeping out of the way, if above-mentioned main axis rotation allows each drive rod and phase interlock according to the position of rotation of above-mentioned needle-bar cam and presser feet cam, even shank and presser feet are incomplete, it also can move continuously.Therefore, in multi-head sewing machine, allow under the situation that any sewing machine head stops, must allow the shank of this sewing machine head and presser feet avoid, simultaneously, must allow the continuous action relation of aforementioned machine spindle and each cam cut off by clutch.That is, this clutch must be provided with corresponding to each head of sewing machine, thereby the complicated problem of driving device structure occurs.

The applicant's first invention is in view of the inner above-mentioned defective that exists of above-mentioned conventional art, a kind of scheme that is suitable for addressing these problems has been proposed, its objective is the wire-cutting device that a kind of chain sitch sewing machine is provided, when it is cut off by the yarn shut-off mechanism at the sewing thread and yarn of deriving by loop taker, near its cut-out end, keep body to keep by yarn.Simultaneously, can carry out sewing thread and yarn well reaches the standard grade towards Sewing needles.

Have again, the application's the 2nd invention, its objective is in the multi-head sewing machine that has most sewing machine heads, want the shank and the presser feet of any sewing machine head of ending to keep out of the way action by allowing, can cut off the needle-bar cam in this sewing machine head and the continuous action relation of presser feet cam and shank drive rod and presser feet drive rod, thereby in each sewing machine head, need clutch be set all on each, simplify the structure of drive unit.

In order to address the above problem, realize desired purpose, the application's chain sitch sewing machine wire-cutting device is to carry out under the co-operating by the loop taker that disposes below the Sewing needles that drives up and down and the needle plate in the chain sitch sewing machine that chain-type stitch sews

The movable body that configuration can be advanced and retreat and be moved on above-mentioned loop taker and between the gap below the above-mentioned needle plate,

Allow above-mentioned movable body make the movable body driving mechanism that advance and retreat drive,

Be configured in the below of above-mentioned needle plate, when above-mentioned movable body reciprocating motion and its co-operating, cut off the fixed body of sewing thread and yarn,

After above-mentioned sewing thread and yarn cuts off, by the reciprocating motion action of above-mentioned movable body, the maintenance body that the yarn end that makes above-mentioned sewing thread and yarn after the cut-out be in loop taker one side is held in a predetermined position.

For the dissatisfied above-mentioned same problem of determining, and realize the desirable purpose another one invention of the present invention be by the Sewing needles that drives up and down be configured in needle plate below loop taker co-operating and carry out having in the Sewing machines of chain-type stitch sewing:

On above-mentioned loop taker and above-mentioned needle plate below the gap in can advance and retreat the action movable body,

The piece driving mechanism that allows above-mentioned movable body advance and retreat drive,

Be configured in the below of above-mentioned needle plate, co-operating with it when above-mentioned movable body reciprocating motion, thus cut off the fixed body of sewing thread and yarn,

After above-mentioned sewing thread and yarn was cut off, by the reciprocating action of above-mentioned movable body, the yarn that the yarn end that makes the above-mentioned sewing thread and yarn that has cut off be in above-mentioned loop taker one side is held in a predetermined position kept body,

Be attached in the above-mentioned movable body, the releasing body that above-mentioned yarn keeps the yarn confining force of body is removed in the reciprocating motion when sewing by above-mentioned movable body.

In order to solve above-mentioned identical problem, another scheme of the present invention of finishing the desired order of the present invention ground is to be undertaken having in the chain sitch sewing machine of chain-type stitch sewing by the Sewing needles that drives up and down and the co-operating that is arranged on the loop taker below the needle plate:

The loop taker supporter of a plurality of above-mentioned loop takers is supported in the below that is configured in above-mentioned needle plate that can slide,

Drive above-mentioned loop taker supporter and slide, the loop taker selection mechanism that a loop taker is placed position, opposite, above-mentioned Sewing machines below,

Be configured in the following gap of top and above-mentioned needle plate of a selecteed above-mentioned loop taker, the movable body of the action of advancing and retreat,

With the movable body driving mechanism of above-mentioned movable body advance and retreat driving,

Be configured in the below of above-mentioned needle plate, in the extensive co-operating and cut off the sewing thread and yarn fixed body with it when former of above-mentioned movable body,

By the reciprocating action of the above-mentioned movable body after the above-mentioned sewing thread and yarn cut-out, and the above-mentioned sewing thread and yarn after will cutting off is in the yarn maintenance body that the yarn end of above-mentioned loop taker one side is held in a predetermined position,

Be attached in the above-mentioned movable body, when making, remove the releasing body that above-mentioned yarn keeps the yarn confining force of body by the reciprocating action of above-mentioned movable body.

In addition, the application's the 2nd invention is a kind of multi-head sewing machine actuating device that has a plurality of sewing machine heads, above-mentioned machine spindle is rotatable above-mentioned each head of sewing machine that connects drivingly, described head of sewing machine is by being fixed on needle-bar cam and the presser feet cam that rotates jointly with this machine spindle on the machine spindle, by reciprocating motion within the specific limits with the interlock of this needle-bar cam and the rotation of presser feet cam, make shank and presser feet make the shank drive rod and the presser feet drive rod of lifting action respectively thus, allow this shank drive rod and presser feet drive rod surpass above-mentioned preset range and rotate upward, thereby the mechanism of keeping out of the way that shank and presser feet are avoided upward constitutes.

In above-mentioned each head of sewing machine, dispose respectively and drive each correspondence and keep out of the way the transmission device of mechanism and allow and allow shank and presser feet keep out of the way in the action with needle-bar cam and the pairing drive rod of presser feet cam in the above-mentioned mechanism of keeping out of the way in each sewing machine head, cut off the structure of mutual continuous action relation.

Fig. 1 is the front view of the 1st invention chain sitch sewing machine;

Fig. 2 is the cutaway view of A-A line among Fig. 1;

Fig. 3 is the amplification front elevation of loop taker supporter and yarn ledger line machine plate;

Fig. 4 is the side view cutaway drawing of Fig. 3;

Fig. 5 is the amplification stereogram of a loop taker supporter part;

Fig. 6 is the key diagram of wire clamp tension force change action;

Fig. 7 is the stereogram of yarn shut-off mechanism;

Fig. 8 is the plane of loop taker supporter and yarn shut-off mechanism;

Fig. 9 is the action specification figure of yarn shut-off mechanism;

Figure 10 is the action specification figure of yarn shut-off mechanism;

Figure 11 is the action specification figure of yarn shut-off mechanism;

Figure 12 is the action specification figure of yarn shut-off mechanism;

Figure 13 is the amplification view that yarn keeps body;

Figure 14 is the front view of indivedual sewing machine heads of the bull formula chain sitch sewing machine of the present invention the 2nd invention;

Figure 15 is the cutaway view of sewing machine head sidepiece;

Figure 16 is the amplification view of sewing machine head;

Figure 17 is the longitudinal sectional view of Figure 16;

Figure 18 is the cutaway view that sewing machine head is seen from the opposite side of Figure 15;

Figure 19 is the cutaway view of the axial sewing machine head of expression lifting;

Figure 20 is the schematic diagram of the pivot point change state of shank drive rod;

Figure 21 is the cutaway view of keeping out of the way state of shank drive rod.

Most preferred embodiment to chain sitch sewing machine wire-cutting device of the present invention describes with reference to the accompanying drawings.Fig. 1 shows for example can carry out the bull formula chain sitch sewing machine that yarn is selected, front one side at the upper frame 1 that constitutes this Sewing machines has for example 2 row's

sewing machine heads

2,2 by predetermined arranged spaced, simultaneously, on each sewing machine head 2, connect respectively and be provided with machine spindle 3, Sewing needles Position Control axle 4 and direction Control Shaft 5.Wherein machine spindle 3 is connected by reductor etc. on the stand-by motor 7 that is arranged at quadrate part behind upper frame 1 left end, by the rotation of this main shaft 3, is configured in Sewing needles 6 on the sewing machine head 2 and is formed up and down reciprocatingly by not shown mechanism and drive.In addition, Sewing needles Position Control axle 4 and direction Control Shaft 5 are driven by the

pulse motor

8,9 of the front that is separately fixed at upper frame 1.Like this, Sewing needles Position Control axle 4 by the stroke height of mechanism controls Sewing needles 6 not shown in the figures, is controlled the direction (pin portion towards) of Sewing machines 6 because of its rotation again by the rotation of direction Control Shaft 5.

As shown in Figure 2 on the lower frame 12 that is positioned at below the sewing machine table 10, the relation with corresponding with each sewing machine head 2 is fixed with gear-box 11,11.Correspondingly with

sewing machine head

2,2 on the front end face of this gear-box 11 be provided with the supporters 13,13 (hereinafter referred to as the loop taker supporter) that 2 rows support aftermentioned loop takers 17.This loop taker supporter the 13, the 13rd is provided with the case shape formed body of a plurality of loop takers 17, and fixing

rectilinear orbit

15,16 clampings of its back side one side and are fixed on the rectilinear orbit 14 that extends about said gear case 11 fronts as shown in Figure 4.Thus,

loop taker supporter

13,13 can slide on the left and right directions of Fig. 1 along this rectilinear orbit 14.

Can rotate according to each predetermined interval and the easy on and off ground vertical support of moving above-mentioned loop taker 17 (having 6 among the embodiment) along the glide direction of this

loop taker supporter

13,13 on each

loop taker supporter

13,13 upper surface.This loop taker 17 is made of the columnar component according to its position change diameter dimension, as shown in Figure 3 and Figure 4, from the head 17a according to required interval below form spur gear 17b, the below forms axial region 17c again, in addition, upper central at head 17a partly runs through the blind hole 17d that is provided with 6 declines of permission Sewing needles, is formed with the yarn export mouth 17f that is opened on head 17a upper surface simultaneously above the formed yarn through hole of the longitudinal center portion of axial region 17c 17e.And this loop taker 17 applies elastic force downwards all the time by the ring spring 18 that is installed in its bottom.Thus, spur gear 17b remains at the contacted lower position of upper surface 13a, 13a with

loop taker supporter

13,13, in this state as shown in Figure 5, determine the position that the loop taker 17 that matches with the gear of spur gear 17b can not rotate on the alignment pin 27 of the front panel 26 of the front of being fixed in

loop taker supporter

13,13, at this moment yarn export mouth 17f forms proper alignment in the position of 11 fronts, one side from above-mentioned blind hole 17d towards gear-box (back side one side of loop taker supporter).

The leading section centre of each gear-box 11 can support driven wheel 20 by bearing etc. with rotating freely.This driven wheel 20 as shown in the figure, its upper end is formed with the spur gear 20a that is meshed with the spur gear 17b of loop taker 17.Simultaneously, quadrate part is formed with the helical gear 20b with scroll bar function under it.Helical gear 20b engages with the driving helical gear 21 with turbine function of gear-box 11 internal configurations in addition.This driving helical gear 21 is fixed on and connects on the driving shaft 22 that is disposed on each gear-box 11, by the reciprocal rotation of driving shaft 22, by driving helical gear 21 and helical gear 20b driven wheel 20 is back and forth rotated.In addition, driving shaft 22 is connected with the motor shaft of pulse motor 28 on being fixed on lower frame 12.

Front one side of above-mentioned

loop taker supporter

13,13 disposes connecting rod 23 as shown in Figure 1.This connecting rod 23 is fixed on this

loop taker supporter

13,13 by the

connector

24,24 that is fixed on loop taker supporter 13,13 a positive both ends, and its right part is connected and is arranged in the loop taker selection mechanism 25 nearby of framework 12 ends.In addition, loop taker selection mechanism 25 is owing to be to select signal and connecting rod 23 moved on axis direction to drive according to loop taker, thereby two

loop taker supporters

13,13 are moved simultaneously along above-mentioned rectilinear orbit 14.And be supported in the loop taker 17 on each

loop taker supporter

13,13 any one all be configured in relative position, above-mentioned driven wheel the place ahead, thereby finish following function.

Bottom at

loop taker supporter

13,13 has engaged clamp substrate 30 respectively, the female component that this clamp substrate 30 allows its back side one side install is entrenched on the line slideway 31 that is installed on lower frame 12 fronts, and it is being supported at horizontal direction with can move freely.Therefore, as described below, by loop taker selection mechanism 25 in selection when action of carrying out loop taker 17, can move with

loop taker supporter

13,13, in addition, in the front of clamp substrate 30, corresponding direction along approximate horizontal with the number of loop taker 17 is respectively equipped with 6 the 1st wire clamps 32 and the 2nd wire clamp 33.On the 2nd wire clamp 33 therein, with outstanding respectively state configuration the pin of adjusting 35 is arranged in a side of clamping above-mentioned clamp substrate 30 back sides.This adjusting pin 35 is exerted pressure to back side direction all the time by elastomeric elements such as spring not shown in the figures, is provided with in its back side one side and regulates the pin 35 horizontal strip pressing plates of depressing simultaneously 36 with 6.

Above-mentioned pressing plate 36 can support rotatably around round portion center down, and pressing operation is carried out in the rotation of the 1st plane cam 37 by its rear configuration.The 1st plane cam 37 is being that bore is fixed on the rotating shaft 40 that can support with rotating freely corresponding to

carriage

38,38 fixing on each clamp substrate 30 rear lower portion framework 12.And rotating shaft 40 is connected with the motor shaft of pulse motor 41 on being fixed on another carriage 38 (referring to Fig. 4).Therefore, along with the rotation of this pulse motor 41, will regulate pin 35 by the 1st plane cam 37 and pressing plate 36 and be pressed into, thereby remove the tension force that is applied by 33 couples of sewing thread and yarn a of the 2nd wire clamp, simultaneously, owing to removed 35 push sold in this adjustings, and yarn a is applied tension force.In addition, along continuous straight runs is fixed with yarn guide 34 on the central part of above-below direction in front, and the sewing thread and yarn a that is guided by the 2nd wire clamp 33 passes through this yarn guide 34.

In addition, on above-mentioned carriage 38, supporting swing arm 43 swingably, forming wobble drive under the formed cam follower of vertical middle body 45 and the mating reaction that is fixed on the 2nd plane cam 46 on the above-mentioned rotating shaft 40 along it by axle 44.The free end of this swing arm 43 matches with the drive rod 47 that actuating sleeve loop mechanism 17 moves up and down, but be supported on to this drive rod 47 easy on and off motion the front of lower frame 12, its upper end is formed with the pressing part 47a that pushes down loop taker 17 lower ends, in addition, the outstanding pin 48 that is arranged on the bottom be formed at swing arm 43 free-ended mating groove 43a tablings.And swing arm 43 is pressed towards the counter clockwise direction of Fig. 4, thus, makes drive rod 47 press to the below.

In addition, on the top of said gear case 11 yarn shut-off mechanism 50 is installed.This yarn shut-off mechanism 50 setting-in on the mobile guiding section 51 that is formed at gear-box 11 top fore-and-aft directions slide block 52, is fixed with movable body 53 by screw 54 by Len req along fore-and-aft direction in the above.Be formed with tooth bar 52a on the lower surface of this slide block 52, be meshed with gear 56 fixing on the slide block driving shaft 55 of each gear-box 11 internal run-through configuration.Slide block driving shaft 55 is connected with the motor shaft of pulse motor 57 on being fixed on lower frame 12 as shown in Figure 1.Driving by this pulse motor 57 makes slide block 52 front-rear reciprocation movements.In addition, above-mentioned movable body 53 be respectively by the yarn of its leading section induce sheet 53a, form blade 53b, the yarn capture unit 53c of circular arc and between yarn capture unit 53c and blade 53b the formed paragraph 53d of portion constitute.At position of readiness shown in Figure 8, the leading section of movable body 53 retreats into from loop taker 17 and vacates position at interval backward.

Rear position by above-mentioned loop taker selection mechanism 25 selected loop takers 17 (with the loop taker 17 that is positioned at the relative configuration in driven wheel 20 the place aheads), as Fig. 4 and shown in Figure 7, be provided with the fixed body 58 that roughly is same width dimensions with movable body 53 and sets.On the lower surface of this fixed body 58 owing to the leading section that is fixed in the gripper shoe 60 above the gear-box 11, the lower edge of its leading section forms blade 58a.In addition, below fixed body 58, dispose supporter 61, form leading section insertion that allows movable body 53 and the gap of transfering between its upper surface and the fixed body 58.

In addition, between the rearward end of the leading section of movable body 53 and fixed body 58 as shown in the figure, form the space 63 of required size, in this part, hold yarn and keeping body 62, that is, this yarn keep body 62 by carriage 13b, the 13b at the both ends, the left and right sides that are vertically fixed on

loop taker supporter

13,13 with between this carriage 13b, 13b with about two

gripper shoes

64,64 of required width interval setting constitute.Between two

gripper shoes

64,64, as Fig. 3 and shown in Figure 7, the holding plate 65 of 6 yarn a is installed, each holding plate 65 is set at wideer elastic plate with the head 17a than loop taker 17 and is bent into wedge shape and constitutes, and its peristome is disposed side by side with the state that points to this loop taker 17.When this holding plate 65 of configuration, with the upper end of wedge-like portion and the lower surface formation Elastic Contact of the gripper shoe 64 that is positioned at upside, and it is outer, yarn keeps body 62 to move jointly with

loop taker supporter

13,13 by above-mentioned carriage 13b, 13b when selecting loop taker 17, is configured in the opposite of fixed body 58 back quadrate parts corresponding to 65 of the holding plates of selected loop taker 17.

In addition, on the above-mentioned slide block 52 that movable body 53 is installed, be provided with rectangular frame shape and remove body 66, this releasing body 66 is the position configuration shaped as frame parts on slide block 52 highly to hang down a section than movable body 53, it is positioned at the rear position of the movable body 53 of its framework installed inside, by latch plates 67 fixing above the slide block 52 with this slide block 52 interlock mutually, that is, form recess 66a and recess 66b along its length direction respectively on by needed interval location in a side of long shaped plate that form to remove body 66.In addition, on the latch plate 67 leading section of set lug be formed with can with the protuberance 67a of two

recess

66a, 66b tabling, thereby with recess 66a or recess 66b tabling.Like this, this protuberance 67a is with any one recess 66a, when recess 66b matches, and above-mentioned releasing body 66 is combined as a whole with slide block 52.In this state,, between the

guide plate

68,68 of the both sides of movable body 53 configuration, lead, thereby move with this slide block 52 along with slide block 52 advances corresponding to loop taker 17 or retreats.

On above-mentioned releasing body 66, near the rearward end that forms recess 66a, recess 66b one side, alongst be formed with otch 66c according to needed length.Cooperating the lug 68a that is arranged on above-mentioned guide plate 68 rearward end of a side on this otch 66c, form the mode of swinging of leaving certain distance with the moving direction of slide block 52, like this, when slide block 52 as shown in Figures 7 and 8, when being in position of readiness, the protuberance 67a of latch plate 67 matches with being positioned at the recess 66a that removes body 66 rear sides, and simultaneously, the leading edge of the otch 66c of this releasing body 66 contacts with the lug 68a of guide plate 68.In this state, the front end of movable body 53 is consistent with the front end of removing body 66.In addition, be formed with and roughly become the semicircular wire casing 66d that keeps away removing on body 66 leading sections middle body of broad ways.The upper part of top and

loop taker supporter

13,13 that disposes the gear-box 11 of this yarn shut-off mechanism 50 seals by cover plate 74.In addition, the pairing position, top of the loop taker of having selected 17 is equipped with needle plate 75, is formed with the needle falling hole 76 for Sewing needles 6 break-through on the needle plate 75, with and on every side yarn through hole 77.

In addition, lower position at clamp substrate 30 disposes bobbin frame plate 70 as shown in Figures 1 and 2, supply with on end 6 in the yarn tube 71 of the sewing thread and yarn a of each clamp substrate 30, the yarn a that pulls out from each yarn tube 71 passes above-mentioned the 1st wire clamp the 32, the 2nd wire clamp 33 of wire holding machine plate 30 by yarn guide 72, the yarn guide 73 of yarn guide 34 and

loop taker supporter

13,13 lower ends and importing in each loop taker 17.

Below, the effect of the wire-cutting device of the chain sitch sewing machine of present embodiment is described.At first, be provided with for example different sewing thread and yarn a of all kinds of color in each loop taker 17 of loop taker supporter 13, shown in Figure 12 (b), the yarn a that derives from yarn export mouth 17f forms the state that plate 65 maintains that is held.When under this state, beginning to sew, at first carry out the selection of yarn a (loop taker 17), when selecting, instruct with manually importing by the action bars that does not illustrate among the figure, perhaps according to the automatic command driving pulse motor 41 of program composition, by the rotation of the above-mentioned rotating shaft 40 that is attached thereto, the 1st plane cam 37 and the 2nd plane cam 46 arrive the position of rotation shown in Fig. 6 (a).That is, pressing plate 36 is corresponding with the minimum diameter position of the 1st plane cam 37, and simultaneously, the cam follower 45 of swing arm 43 is corresponding with the minimum diameter position of the 2nd plane cam 46.Thus, the adjusting pin 35 of the 2nd wire clamp 33 is outstanding to the 1st plane cam 37 directions of pushing down pressing plate 36, becomes the state that applies tension force to sewing thread and yarn a.In addition, the free end of swing arm 43 at this moment is owing to be positioned at upper/lower positions, thereby the drive rod 47 that is connected with this swing arm 43 also drops to minimum point, and the set pushing part 47a in the upper end of this drive rod 47 has left the lower end of loop taker 17.Thereby loop taker 17 will be maintained at the down position with the upper surface 13a joint of spur gear 17b and loop taker supporter 13.Simultaneously, than spur gear 17b then with position alignment pin 27 tablings of the front panel 26 that is fixed on this loop taker supporter 13.

Afterwards, by not from operating grip make loop taker selection mechanism 25 actions by the instruction of manual input or according to the automatic command of program, by connecting rod 23 loop taker supporter 13 is slided and drives, thereby select loop taker 17.In case this selection release, shown in the direction of arrow of Fig. 6 (b), the rotating shaft 40 of pulse motor 41 counterclockwise drives rotation, and the cam follower 45 of swing arm 43 moves to the maximum gauge position of the 2nd plane cam 46.Be accompanied by this move, swing arm 43 clockwise directions rotate, and drive rod 47 is moved upward simultaneously, and thus, the pushing part 47a by the upper end shifts loop taker 17 onto selected position.Like this,, move to the outside of the spur gear 17b of loop taker 17, thereby be meshed with the spur gear 20a of the set above-mentioned driven wheel 20 of gear-box 11 leading sections from above-mentioned alignment pin 27 as Fig. 4 and shown in Figure 5.In addition, Fig. 3 is the loop taker 17 that the 3rd position on loop taker supporter the right selected in expression, the state that this spur gear 17b is meshed with driven wheel 20a.

In this state, in a single day move the starting switch (not shown) on the operating grip position of ON to, since the driving of the spindle motor 7 that is provided with on the upper frame 1, main shaft 3 rotations, and Sewing machines 6 is descended.In the moment of its arrival predetermined down position that descends, by driving helical gear 21 and driven wheel 20 loop taker 17 rotations are driven, on Sewing needles 6, hang up yarn.In case the action of reaching the standard grade of this 1st Sewing needles ends, the pulse motor 57 of yarn shut-off mechanism 50 just drives, and slide block driving shaft 55 is pressed the counter clockwise direction rotation of Fig. 4, thus, as shown in Figure 8, the slide block 52 that is in position of readiness moves to left (near the direction of loop taker 17).In addition, when this slide block 52 moves, owing to remove the recess 66a of body 66 and the protuberance 67a tabling of latch plate 67, along with moving of this slide block 52, movable body 53 moves with removing body 66 one, like this, the front end of releasing body 66 as shown in Figure 9, by be pressed in holding plate 65 above, thereby removed the maintenance of yarn a, and the driving of pulse motor 57 also stops.The Sewing needles 6 that has been disengaged yarn a moves upward, and guides this yarn a into top, and in the moment that the yarn end that is kept by holding plate 65 is transferred to from holding plate 65, pulse motor 57 drives round about and makes slide block 52 turn back to position of readiness.In addition, as shown in figure 13, thus when the front end of removing body 66 presses the maintenance of removing yarn a above the holding plate 65, be formed with and keep away wire casing 65d owing to remove the front end of body 66, thereby the yarn a on the holding plate 65 can not pushed, thereby positively sewing thread and yarn is decontroled.

When the operation that the sewing thread and yarn a (loop taker 17) that selects is made finishes, at first loop taker 17 is dropped to by under the position.That is, the driving by pulse motor 41 makes rotating shaft 40 rotate around the clockwise direction of Fig. 4, cam follower 45 is moved to the minimum diameter place of above-mentioned the 2nd plane cam 46.Thus, be depressed with the drive rod 47 of these cam follower 45 interlocks, the loop taker 17 that is boosted by this bar 47 drops to lower position.

Then, drive the pulse motor 57 of yarn shut-off mechanism 50, slide block driving shaft 55 is along the counter clockwise direction rotation of Fig. 4, and thus, the movable body 53 that is in position of readiness moves to left, arrives the most outstanding position and carries out predetermined actions.After its action was finished, this pulse motor 57 drove in the other direction, yarn a was cut off and carry out the maintenance action of yarn ends portion to the return action of position of readiness by movable body 53.This a succession of process is described to Figure 12 by Fig. 8, and by the driving of above-mentioned pulse motor 57, slide block 52 moves to the direction near loop taker 17.At the initial stage of this action, as previously mentioned, removing on the recess 66a of body 66 because chimeric the protuberance 67a of latch plate 67, thereby movable body 53 is mobile with removing body 66, as shown in Figure 9, removes the front end of body 66 and is pressing holding plate 65, in the moment that arrives the holding position of removing yarn a, the trailing edge of removing the above-mentioned otch 66c of body 66 contacts with lug 68a, and henceforth, movable body 53 moves on latch plate 67.And in a single day the sewing thread and yarn a that pulls out between the yarn export mouth 17f of the needle falling hole 76 of needle plate 75 and loop taker 17 passes the gap between fixed body 58 and the supporter 61 owing to induce cooperating of sheet 53a with the yarn of progressive movable body 53 and release to foreign side, as shown in figure 10, arrive moment of extrusion position at movable body 53, sewing thread and yarn a induces sheet 53a to enter the yarn capture unit 53c of movable body 53 from yarn.

Then, movable body 53 retreats towards position of readiness, retreats along with this, and sewing thread and yarn a catches part 53c by yarn and stretches towards fixed body 58.As shown in figure 11, produce by blade 53b and fixed body 58 and interfere and sewing thread and yarn a is cut off.When cutting off, movable body 53 is subjected to the reclinate power from fixed body 58, and supporter 61 has then prevented this bending, thereby has guaranteed cut-out.In addition, movable body 53 allows above-mentioned releasing body 66 move the process that moves to the position that this sewing thread and yarn a is cut off by this fixed body 58 from the most outstanding position of catching sewing thread and yarn a, is returned to the position at initial stage.Promptly, when movable body 53 retreated in the position from Figure 10, the teat 67a of latch plate 67 and the recess 66a tabling of removing body 66 removed body 66 from this time and retreat jointly with movable body 53, with till tab 68a contacts, retreat into original position up to the leading edge of the otch 66c that removes body 66.

In addition, movable body 53 then continues to retreat after releasing body 66 is returned to original position, as shown in figure 12, in the moment identical with being returned to position of readiness the teat 67a of latch plate 67 being entrenched in removes among the set above-mentioned recess 66a of body 66 back quadrate parts, this movable body 53 is by cutting off in the process that retreats at sewing thread and yarn a the most at last with the co-operating of fixed body 58, the yarn end of making yarn a of loop taker 17 1 sides is passed between the paragraph part 53d and fixed body 58 lower ends of movable body 53, when getting back to the position of readiness of movable body 53, shown in Figure 12 (b), the sewing thread and yarn a of loop taker 17 1 sides is owing to the elastic force of holding plate 65 is maintained between holding plate 65 and the upper support plate 64.Afterwards, by the slide of loop taker supporter 13, carry out repeatedly from selecting a series of action till loop taker 17 begins to cut off to yarn, thereby can carry out the polychrome sewing versicolor sewing thread and yarn a (loop taker 17).

In addition, after the selection of loop taker 17 action, shown in Fig. 6 (b), when loop taker 17 is placed the position, continue to rotate rotating shaft 40, shown in Fig. 6 (c), the maximum gauge position of the 1st plane cam 37 and pressing plate 36 are corresponding and be rotated.Thus, the adjusting pin 35 of the 2nd wire clamp 33 is pressed into, thereby removes the tension force that the sewing thread and yarn a to the 2nd wire clamp 33 applies.Therefore, by the rotation of rotating shaft 40, after loop taker 17 is located at upper position, the rotation once more by rotating shaft 40 or do not rotate, just can select and revolve the tension force that is added on the sewing thread and yarn a, thereby can access and enclose seam or the corresponding separately suitable wire clamp of chain seam.

Like this, wire-cutting device according to the 1st the described chain sitch sewing machine of invention, after sewing thread and yarn is cut off, maintenance to the remaining sewing thread and yarn of a side of loop taker can obtain by number of parts and easy structure seldom, thereby the reduction manufacturing cost reaches the effect that improves the reliability of moving simultaneously.In addition,, the hold mode of yarn can be removed smoothly by removing body in when sewing, after sewing in obstacle can not appear just, and carried out reposefully.In addition, by on each loop taker of loop taker support, using diverse sewing thread and yarn, just can carry out the composite embroidery of different yarns kind.

Below, lift an illustrated embodiments with reference to accompanying drawing drive unit with the multi-head sewing machines of 2 inventions is described.And the following examples are the drive units of the present invention that are applicable in the bull chain sitch sewing machine.

Shown in Figure 14-17, in sewing machine arm 10, be penetrated with a machine spindle 12, these machine spindle 12 common sewing machine arms that connect other sewing machine heads not shown in the figures, by drive source (not shown) such as motors, drive to a direction rotation, in addition, on the axle of sewing machine arm 10 inner machine spindles 12, be fixed with as shown in figure 16 needle-bar cam 14, sleeve cam 16 and presser feet cam 18 respectively.

Its left and right directions substantial middle position on above-mentioned sewing machine arm 10 forms revolving hollow spindle 20 cylindraceous along supporting of can rotating freely of its rotation.In this rotation is empty on spools 20 the inner peripheral surface, for example Figure 15 is indicated, the shank 22 that can carry out lifting action is installed, Sewing needles 23 is installed on the bottom of this shank 22, simultaneously on periphery wall, be fixed with shank base 24 cylindraceous the upper end of shank 22.This shank base 24 can carry out lifting action with the shank 22 of being guided by the inner peripheral surface on above-mentioned revolving hollow spindle 20 tops.In addition, revolving hollow spindle 20 and shank 22 form the mode of can one rotating along axis direction by this shank base 24.

Dispose sleeve base 26 on the outer peripheral face of above-mentioned revolving hollow spindle 20 bottoms, this sleeve base 26 can form the structure that moves up and down by the guiding of the inner peripheral surface of pilot sleeve 28 fixing on the above-mentioned sewing machine arm 10.This sleeve base 26 also form can with the structure of revolving hollow spindle 20 in same axis direction rotation.In addition, on sleeve base 26 bottoms, be combined with sleeve 27.

As Figure 14 and shown in Figure 15, be fixed with gear 21 on the outer peripheral face of the empty axle 20 of above-mentioned rotation, in addition, the interior bottom portion of sewing machine arm 10 is shown in Figure 15 and 17, be fixed with motor 30, the above driven wheel 32 of this motor 30 combines with the gear 21 of above-mentioned revolving hollow spindle, like this, when sewing (during chain-type stitch sewing embroidery), driving by above-mentioned motor 30, turnbarrel hollow shaft 20 rotates around axis, phase interlock therewith, above-mentioned shank 22 (Sewing needles 23) and sleeve 27 just be controlled in the corresponding direction of Sewing machines direction of advance on.

Shown in Figure 14 and 17, be fixed with the right side axis of guide 40 of above-mentioned revolving hollow spindle 20 (or shank 22) on the above-mentioned sewing machine arm 10.Can be supported with shank Lift Part 42 and

sleeve Lift Part

45,46 up or down respectively on this axis of guide 40.

Above-mentioned shank Lift Part 42 is exerted pressure downwards by spring 44 set on its top axis of guide 40, and its pressure acts on the shank drive rod 70 as the back is illustrated.In addition, as Figure 14 and shown in Figure 17, be formed with forked pawl 43 on the Lift Part 42, the loop hook groove that forms on the outer peripheral face of this pawl 43 and above-mentioned shank base 24 matches.Therefore, Lift Part 42 is in case driven up and down by the axis of guide 40, interlock with it, and above-mentioned shank is then made lifting action with Sewing needles 23.

Figure 18 is the cutaway view of the sewing machine head seen from the opposite side of Figure 15.From figure, find out clearly, above-mentioned sleeve Lift Part the 45, the 46th, separated parts by the elastic force of mutual set spring 49, form the relation of a body action up and down all the time.In addition, this

Lift Part

45,46 is pressed towards the below by the elastic force of the spring 48 of top configuration, on the sleeve drive rod 76 that will illustrate after this pressure acts on.And on the above-mentioned Lift Part 46, be formed with the pawl 47 that the cannelure that forms on the periphery wall with above-mentioned sleeve base 26 matches as shown in figure 14.Like this, in a single

day Lift Part

45,46 is driven up and down by the axis of guide 40, and interlock makes above-mentioned sleeve 27 make lifting action therewith.

As Figure 14 and shown in Figure 17, the left side of above-mentioned revolving hollow spindle 20 (perhaps shank 22) can be supported with lifting shaft 50 up or down on above-mentioned sewing machine arm 10.Be fixed with the cleat 51 that has lever pin 52 on the upper end of this lifting shaft 50, be fixed with the base portion of presser feet 54 simultaneously on the periphery wall of lifting shaft 50 lower ends.At this, above-mentioned " presser feet " is the notion of a common name also having sleeve or only having under the situation of sleeve.

Figure 19 is the cutaway view of the sewing machine head of above-mentioned lifting shaft 50 peripheries of expression.Can find out obviously that from figure lifting shaft 50 carries out knee-action having limited it under the state of its revolution rotation rotation with respect to sewing machine arm 10, by drawing, makes above-mentioned presser feet 54 make lifting action.In addition, be provided with spring 56 between the root of presser feet 54 and the sewing machine arm 10 on the axle of lifting shaft 50, below all the time this lifting shaft 50 being pressed to by the elastic force of this spring 56.Like this, this, acts on the presser feet drive rod 80 by above-mentioned lever pin 52 as following will the explanation to the power that presses down.

Mainly by Figure 15 and shown in Figure 17, can support the both ends of wanting the back shaft 60 of main shaft 12 configured in parallel with sewing on the above-mentioned sewing arm 10 with rotating freely, as shown in figure 17, can be supported with shank drive rod 70, sleeve drive rod 76 and presser feet drive rod 80 respectively on the axle of this back shaft 60 with rotating freely.On the above-mentioned back shaft 60, as Figure 15 and shown in Figure 17, be fixed with gear 62, this gear 62 is meshed with the driven wheel 66 of motor 64 on being fixed on sewing machine arm 10.Therefore, by this motor 64, can control around the rotation of axis back shaft 60.In addition, this motor 64 also has the function of the adjuster of keeping out of the way mechanism 90 that the back will illustrate concurrently.

Above-mentioned shank drive rod 70 as shown in figure 15, its roughly mid portion be supported on the eccentric part 61 of back shaft 60, by can change the pivot point of shank drive rod 70 to the rotation of this back shaft 60 control.In addition, the roller 72 of an end setting of shank drive rod 70 matches with the cam path of above-mentioned needle-bar cam 14, and simultaneously, the other end of this bar 70 is connected with above-mentioned shank Lift Part 42 by attaching parts 74.Like this, needle-bar cam 14 rotates jointly with above-mentioned machine spindle 12, interlock therewith, and 70 reciprocating motions of shank drive rod, shank Lift Part 42 is driven up and down by the above-mentioned axis of guide 40.

Above-mentioned sleeve drive rod 76, as shown in figure 18, its roughly mid portion be supported on the above-mentioned back shaft 60.Roller 78 set on one end of this sleeve drive rod 76 matches with the cam path of above-mentioned sleeve cam 16, and simultaneously, the other end is connected with above-mentioned sleeve Lift Part 45 by attaching parts 79.Therefore, sleeve driving cam and machine spindle 12 rotate jointly, are attached thereto movingly, and sleeve drive rod 76 is reciprocating, and two

Lift Parts

45,46 of sleeve move up and down under the driving of the axis of guide 40.

In addition, above-mentioned presser feet drive rod 80 as shown in figure 19, its substantial middle partly is supported on the back shaft 60, like this, the set roller 82 of one side end of this presser feet drive rod 80 contacts with the outer peripheral face of above-mentioned compress cam, in addition, set another roller 84 of the other end with respect to the lever pin 52 of above-mentioned lifting shaft 50 from side contacts down.

On the above-mentioned needle-bar cam 54 and sleeve cam 16 that constitute by the flute profile cam,, be formed with notch 14a, the 16a of the part of opening that makes cam path respectively as Figure 15 and shown in Figure 180.And above-mentioned shank drive rod 70 acts on the above-mentioned shank Lift Part 42, apply elastic force by spring 44, in addition, sleeve drive rod 76 acts on two

Lift Parts

45,46 of sleeve, apply elastic force by spring 48, thus, the roller 72,78 on the

drive rod

70,76 is in the position in the cam path all the time at notch 14a, the 16a place of needle-bar cam 14 and sleeve cam 16.In addition, compress bar 80 acts on the lifting shaft 50, applies elastic force by spring 56, therefore, be that roller 82 is on one side contacted with the outer peripheral face of splenium cam 80 all the time, and the roller 84 of another side contacts with above-mentioned lever pin 52.

Below, the mechanism 90 of keeping out of the way that above-mentioned shank 22, sleeve 27 and presser feet 54 are kept out of the way upward describes.As Figure 15,18 and shown in Figure 19, can be supported with camshaft 92 on the above-mentioned sewing machine arm 10 with machine spindle 12 and above-mentioned back shaft 60 configured in parallel with rotating freely.On the axle of this camshaft 92, be fixed with two and keep out of the way cam 94,95.In addition, be formed with

outstanding protuberance

71,77,81 on above-mentioned shank drive rod 70, sleeve drive rod 76 and the presser feet drive rod 80 respectively downwards.One side keep out of the way cam 94 as shown in Figure 5, can contact with the protuberance 71 of shank drive rod 70, opposite side keep out of the way cam 95, as Figure 18 and shown in Figure 19, can contact with the

protuberance

77,81 of sleeve drive rod 76 and presser feet drive rod 80 respectively.

As Figure 15 and shown in Figure 17, be fixed with gear 96 on the above-mentioned camshaft 92, this gear 96 is meshed with the gear 62 of above-mentioned back shaft 60.Like this, by the driving of above-mentioned motor 64, the camshaft 92 that passes back shaft 60 rotations is rotated control with moving back wall cam 94,55.In addition, as Figure 14, Figure 16 and shown in Figure 17, an end of above-mentioned back shaft 60 is provided with angle detector 68.Can detect the anglec of rotation of back shaft 60 and camshaft 92 by this angle detector 68.

Below, the effect of the drive unit of this structure is described.

At first when sewing (chain-type stitch sewing embroidery),, needle-bar cam 14, sleeve cam 16 and presser feet cam 18 are rotated jointly by the driving of above-mentioned machine spindle 12.With this needle-bar cam 14 mutually interlock shank drive rod 70 between solid line shown in Figure 15 and imaginary line, move back and forth, along with the knee-action of above-mentioned shank Lift Part 42, above-mentioned shank 22 drives with Sewing needles 23 1 liftings.

In addition, by the rotation of sleeve cam 16, the reciprocating motion between solid line shown in Figure 180 and imaginary line A1 of above-mentioned sleeve drive rod 76, along with the knee-action of above-mentioned

sleeve Lift Part

45,46, above-mentioned sleeve 27 liftings drive.In addition, by the rotation of presser feet cam 18, the reciprocating motion between the solid line of Figure 19 and imaginary line B1 of above-mentioned presser feet drive rod 80 can be crossed above-mentioned lifting shaft 50 and presser feet 54 liftings are driven.Above-mentioned shank 22 (Sewing needles 23) and sleeve 27, carry out direction control by the driving that drives parallel above-mentioned motor 30 with lifting separately corresponding to the sewing direction of advance, thus, with the co-operating of loop taker (not shown) under carry out the chain-type stitch sewing.

On the above-mentioned shank drive rod 70, the driving by above-mentioned motor 64 changes pivot point just as described, thus, the rotation top dead-centre of this shank drive rod 70 can be set in solid line shown in Figure 20 and the optional position between the imaginary line.Thus, can carry out the change of the lifting travel of above-mentioned shank 22.

At this moment, the rotation of above-mentioned back shaft 60 control can stop at the predetermined position of rotation of above-mentioned machine spindle.In addition, by the driving of above-mentioned motor 64, the above-mentioned camshaft 92 of keeping out of the way mechanism 90 also rotates, and by drawing, the above-mentioned

cam

94,95 of keeping out of the way just can not contact with the

protuberance

71,77,81 of

drive rod

70,76,80.

Below, when carrying out the replacement of cloth, keep out of the way the situation that mechanism 90 keeps out of the way shank 22, sleeve 27 and presser feet 54 and illustrated by above-mentioned.In this case, above-mentioned machine spindle stops at preposition, that is, notch portion 14a, the 16a of above-mentioned needle-bar cam 14 and sleeve cam 14 stops at roller 72, the 78 corresponding positions with shank drive rod 70 and sleeve drive rod 76.

At this, above-mentioned motor 64 drives, and makes above-mentioned camshaft 92 rotations, will keep out of the

way cam

94,95 towards solid line position rotation shown in Figure 21.Thus, above-mentioned shank drive rod 70 is pressed in keeping out of the way on the cam 94 of a side with its protuberance 71, shown in the solid line of Figure 21, surpasses the top rotation of rotating range when sewing.In addition, keeping out of the way on the

protuberance

77,81 that cam 95 is pressed in sleeve drive rod 76 and presser feet drive rod 80 respectively of opposite side, sleeve drive rod 76 is shown in the imaginary line A2 of Figure 18, and presser feet drive rod 80 surpasses the top rotation of rotating range respectively towards when sewing shown in the imaginary line B2 of Figure 19.Consequently, above-mentioned shank 22, sleeve 27 and presser feet 54 are kept out of the way the top position of top dead-centre when surpassing sewing respectively.

The roller 72,78 of shank drive rod 70 and sleeve drive rod 76 is shown in the imaginary line A2 of the solid line of Figure 21 and Figure 18 when moving back wall above-mentioned, and notch 14a, the 16a by needle-bar cam 14 and pin pump cam 16 jumps out outside the cam path respectively.In addition, the roller 82 of compress drive rod 80, shown in the imaginary line B2 of Figure 19, leave from the periphery of compress cam 18, like this, when keeping out of the way, the continuous action relation between machine spindle 12 (needle-bar cam 14, sleeve cam 16 and presser feet cam 18) and each drive

rod

70,76,80 is cut off.

Like this, if carry out multi-head sewing machine any sewing machine head keep out of the way operation, then begin the driving of machine spindle 12 again, just the shank 22 of these sewing machine heads, sleeve 27 and press angle 54 not liftings to drive are in dormant state.

In addition, when keeping out of the way, needle-bar cam 14, sleeve cam 16 and presser feet cam 18 are cut off with the continuous action relation of each

bar

70,76,80, this has relaxed greatly towards the rotation quantitative limitation of each

drive rod

70,76,80 tops, thereby above-mentioned shank 22, sleeve 27 and presser feet 54 can be kept out of the way enough height.

According to the 2nd invention, carry out the action of keeping out of the way of the shank of any sewing machine head of multi-head sewing machine and presser feet, since the needle-bar cam of its sewing machine head and presser feet cam drive with shank and the presser feet drive rod between continuous action relation be cut off, just can carry out on each of each sewing machine head, not being provided with any one sewing machine head of termination under the situation of clutch thus.Thereby make the designs simplification of drive unit.

Claims

1, a kind of wire-cutting device of chain sitch sewing machine, it carries out the chain-type stitch sewing by the Sewing needles (6) that drives up and down with the co-operating of the loop taker (17) of needle plate (75) below configuration, it is characterized in that it has:

Dispose the movable body (53) of the action of can advancing and retreat on above-mentioned loop taker (17) and between the gap below the above-mentioned needle plate (75);

Allow above-mentioned movable body (53) make the movable body driving mechanism (52,56) that advance and retreat drive;

Be configured in the below of above-mentioned needle plate (75), when above-mentioned movable body (53) reciprocating motion and its co-operating, the fixed body (58) that cuts off sewing thread and yarn (a);

After above-mentioned sewing thread and yarn (a) cuts off, by the reciprocating motion action of above-mentioned movable body (53), the maintenance body (62) that the yarn end that makes above-mentioned sewing thread and yarn (a) after the cut-out be in loop taker (17) one sides is held in a predetermined position.

2, a kind of wire-cutting device of chain sitch sewing machine, it carries out the chain-type stitch sewing by the Sewing needles (6) that drives up and down with the co-operating of the loop taker (17) of needle plate (75) below configuration, it is characterized in that it has:

After above-mentioned sewing thread and yarn (a) cuts off, by the reciprocating motion action of above-mentioned movable body (53), the maintenance body (62) that the yarn end that makes above-mentioned sewing thread and yarn (a) after the cut-out be in loop taker (17) one sides is held in a predetermined position;

Be attached in the movable body (53), the reciprocating cutter of living by above-mentioned movable body (53) when sewing is removed the releasing body (66) that above-mentioned yarn keeps the confining force of body (62).

3, a kind of wire-cutting device of chain sitch sewing machine, it carries out the chain-type stitch sewing by the Sewing needles (6) that drives up and down with the co-operating of the loop taker (17) of needle plate (75) below configuration, it is characterized in that it has:

The loop taker supporter (13) of a plurality of above-mentioned loop takers (17) is supported in the below that is configured in above-mentioned needle plate (75) that can slide;

Drive above-mentioned loop taker supporter (13) and slide, a loop taker (17) is placed the loop taker selection mechanism (25) of position, opposite, above-mentioned Sewing needles (6) below;

Be configured in the following gap of top and above-mentioned needle plate (75) of a selecteed above-mentioned loop taker (17) movable body (53) of the action of advancing and retreat;

4, the wire-cutting device of chain sitch sewing machine as claimed in claim 3 is characterized in that:

Supplying with to above-mentioned each topping stand (17) on the path of yarn (a), be provided with the wire clamp (33) that applies required tension force by the elastic force of spring to yarn (a), simultaneously, have the governing mechanism of tension (36,37) that the spring force of this wire clamp (33) can be regulated at least in two stages.

5, a kind of drive unit of multi-head sewing machine, go up and the needle-bar cam (14) and the presser feet cam (18) of the common rotation of this machine spindle (12) by machine spindle (12) by being fixed on for described a plurality of head of sewing machine, by reciprocating motion within the specific limits with the interlock of this needle-bar cam (14) and presser feet cam (18) rotation, make shank (22) and presser feet (54) make the shank drive rod (70) and the presser feet drive rod (80) of lifting action respectively thus, allowing this shank drive rod (70) and presser feet drive rod (80) surpass above-mentioned preset range rotates upward, thereby the mechanism (90) of keeping out of the way that shank (22) and presser feet (54) are avoided upward constitutes, and it is characterized in that:

In above-mentioned each head of sewing machine, dispose respectively and drive each correspondence and keep out of the way the transmission device (64) of mechanism (90) and allow and allow shank (22) and presser feet (54) keep out of the way in the action with needle-bar cam (14) and the pairing drive rod of presser feet cam (18) (70,80) in the above-mentioned mechanism (90) of keeping out of the way in each sewing machine head, cut off the structure of mutual continuous action relation.