CN100366812C

CN100366812C - Buttonhole sewing machine

Info

Publication number: CN100366812C
Application number: CNB021513171A
Authority: CN
Inventors: 坂井克秋
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2001-11-19
Filing date: 2002-11-15
Publication date: 2008-02-06
Anticipated expiration: 2022-11-15
Also published as: JP3779912B2; KR20030041791A; JP2003154184A; KR100915282B1; CN1420224A

Abstract

To surely perform sewing to a next buttonholing stitch by holding/ cutting a lower thread so that the length of the end of the thread can be shortened as little as possible. In a sewing machine 10 for buttonholing provided with a fabric feed stage 13, looper base 31, needle plate 32 having a needle hole 32b, turning mechanism 15 for turning the looper base 31, lower thread cutter 30 for cutting the lower thread after the end of sewing, and lower thread holding means for holding the lower thread to be cut, the lower thread holding means is composed of a lower thread guiding face 32f of the needle plate 32 and a lower thread pressing member 27, and the lower thread is cut closely to the lower thread holding means. On the needle plate 32, an opening part 32c is provided while being opened in one direction continuously from the needle hole 32b. Further, a guide means composed of the turning mechanism 15 and the fabric feed stage 13 is provided for guiding the lower thread so that the lower thread can be led out of the opening part 32c and held by the lower thread holding means after the end of sewing.

Description

Sewing machine for binding buttonhole

Technical field

The present invention relates to make the sewing machine for binding buttonhole that forms the buttonhole needle tracking, particularly relate to the cut-out and the maintenance of its bottom line by chain type.

Background technology

In the past, the start-up operation by Sewing machines form buttonhole and around this buttonhole by chain type make form the buttonhole needle tracking sewing machine for binding buttonhole for well-known.In sewing machine for binding buttonhole so, the eedle that is installed with upper thread makes the rotating shuttle action that is installed with bottom line when moving up and down and waving, and forms needle tracking by both co-operating around buttonhole.

In sewing machine for binding buttonhole, open as described in flat 9-225166 number bulletin as the spy of Japan, be provided with after the lock seaming needle tracking forms rotating shuttle with process bottom line (rotating shuttle line) cut-out that is connected between the cloth after the end of a thread of rotating shuttle side is remained to the mechanism that next time lockstitches a border.In the sewing machine for binding buttonhole described in the above-mentioned bulletin, on needle plate, formed gathering sill, it is after the buttonhole needle tracking forms, processing cloth on the needle plate is carried to the direction of regulation, and with this from the processing cloth, bottom line that to be the terminal handle of buttonhole needle tracking be connected with rotating shuttle under the needle plate is directed in the above-mentioned gathering sill, and keeping under the state of this bottom line, and cut off bottom line in position near the end of buttonhole needle tracking by the maintaining part of being located at the needle plate rearward end.The end of a thread of the rotating shuttle side that keeps by above-mentioned maintaining part, its when making beginning next time, its along with because of the carrying out of buttonhole the conveying of cloth, its quilt is sewed up in the buttonhole needle tracking.

But the bottom line of above-mentioned bulletin cuts off following problem in the maintaining body:

(1) in order with moving of the processing cloth on the needle plate bottom line to be directed in the gathering sill, it must be sent the processing cloth quite long distance and bottom line be pulled out very long from rotating shuttle before cut off bottom line.So bottom line is pulled out very longly, except the waste bottom line, its end of a thread that must be sewed up buttonhole needle tracking next time is also very long, or forms the ugly needle tracking of outward appearance, or exposes the end of a thread from buttonhole needle tracking formation portion, thereby reduces its commodity value.

(2) bottom line that keeps with above-mentioned maintaining part, it is sewed up in the buttonhole needle tracking gradually along with the carrying out of buttonhole next time, and deviates from from maintaining part immediately.The bottom line of deviating from from maintaining part, its relative gathering sill is the free state of having been opened from the top of gathering sill, it is sewed up under the state of deviating from from buttonhole needle tracking formation portion easily, and forms when deviating from after the buttonhole needle tracking, the operation that need cut off with the end of a thread that handgrip exposes.

In addition, in lock circle eye Sewing machines, owing to be the structure that rotates synchronously at circle eye eedle and needle plate, so in case as described in (1), its end of a thread that must sew up is very long, then reaches rotating part because of the end of a thread, and when changing needle plate direction with respect to cloth when rotated, it is deviate from from needle tracking easily.

(3) position of the gathering sill on the needle plate, it is in order to guide the end of a thread reliably and to sew up in the buttonhole needle tracking, is set at the needle downing position (interior pin) of buttonhole side and between needle downing position (outer pin) position in buttonhole distally.

But, in sewing machine for binding buttonhole, as everyone knows, the way that penetrates interstitial wire between upper thread and bottom line is arranged.Be used among buttonhole needle tracking guiding interstitial wire and be formed at interstitial wire hole on the needle plate, in it is formed between pin and the outer pin.That is, the interstitial wire hole, it is formed on almost identical with the gathering sill of above-mentioned bulletin position, so needle plate of tape guide groove so, it can not be used to sew up the lock seaming of interstitial wire.

In addition, as the device for cutting lower thread of sewing machine for binding buttonhole, opening on 2001-232086 number bulletin the spy as everyone knows also has record.This announces the device for cutting lower thread of the above, and it is set on the cloth pushing table of carrying the processing cloth.It is after finishing the buttonhole needle tracking and cloth pushing table being delivered to the origin position of regulation, the structure that under the buttonhole needle tracking end of processing cloth bottom line is cut off.

But,,, bother very much so, then need to adjust or change the position of part in addition that constitutes device for cutting lower thread if the length of buttonhole needle tracking changes because this device for cutting lower thread is fixed on the cloth pushing table.In other words, have to the seam calipers is decided to be certain-length.

The objective of the invention is to: on sewing machine for binding buttonhole,, also can sew up buttonhole needle tracking next time reliably even the end of a thread length of the bottom line that residues in the rotating shuttle side after cutting off is short again with bottom line cut-out holding device.

And other purpose is, needn't adjust or change the part in addition of device for cutting lower thread, and it is can corresponding various seams long, and, can have nothing to do with having or not interstitial wire, make the parts generalization.

Summary of the invention

In order to address the above problem, the present invention's 1 described invention, shown in Fig. 1～8 figure, have: rotatably be located on the sewing machine arm (arm 14b), and supporting is passed the eedle (eedle 18) of upper thread and is moved up and down, and make eedle replace the pin that falls from buttonhole outside needle downing position far away and near inboard needle downing position on the cloth being formed at processing, and balancing point direction is in accordance with regulations carried out the shank of balancing point motion, be located on the Sewing machines support (support 12), and transfer the cloth feeding mechanism (cloth pushing table 13) of processing cloth at least to a direction vertical with above-mentioned balancing point direction, in the face of above-mentioned shank rotatably is located on the Sewing machines support, and have with above-mentioned shank co-operating and rotating shuttle (the left-handed shuttle 6 of bottom line on the above-mentioned upper thread, dextrorotation shuttle 5) rotating shuttle seat (31), formed the needle plate (32) that comprises above-mentioned inboard needle downing position and 2 pin holes of outside needle downing position (32b) being positioned on the rotating shuttle seat to be provided with above the rotating shuttle, when buttonhole, make the rotating mechanism (rotating mechanism 15) of shank and rotating shuttle seat rotation, the device for cutting lower thread (device for cutting lower thread 30) that after the buttonhole needle tracking finishes, the bottom line that is connected with the processing cloth from rotating shuttle is cut off, the bottom line that maintenance links to each other with rotating shuttle before cutting off with above-mentioned device for cutting lower thread, and after cutting off when buttonhole next time with above-mentioned cloth feeding mechanism the handover of processing cloth, and keep the end of a thread to be sewed up bottom line maintaining body among the needle tracking naturally, it is characterized in that: around buttonhole (H), form on the sewing machine for binding buttonhole (10) of buttonhole needle tracking (W), its bottom line maintaining body be arranged on needle plate around, on needle plate, be provided with the bottom line the end of a thread that has cut off import in the buttonhole needle tracking that forms next time the bottom line guide part and from pin hole continuously to the peristome (32c) of side's opening, has guide, it is after buttonhole finishes, and before bottom line cuts off, with the rotation of described rotating shuttle seat explicitly from rotating shuttle pass pin hole and be connected on the processing cloth bottom line according to draw from described peristome and by the mode of described bottom line maintaining body maintenance by the channeling conduct of described bottom line guide part.

1 described invention according to the present invention, it is after buttonhole finishes, the bottom line that passes pin hole from rotating shuttle and be connected on the processing cloth is drawn guiding with guide from the peristome of needle plate, and remain on the bottom line maintaining body of being located at around the needle plate, and under this state with device for cutting lower thread the bottom line cut-out between rotating shuttle and processing cloth.

Promptly, needn't as above-mentioned spy open flat 9-225166 number the bulletin as described in, for guiding bottom line in gathering sill is sent quite long distance to the processing cloth before cutting off bottom line, and just bottom line is directed to needle plate bottom line maintaining body on every side from pin hole through peristome, so needn't as above-mentioned bulletin, draw long.

Thereby, can under extremely short state, cut off the bottom line that is connected with the processing cloth from rotating shuttle with device for cutting lower thread.In a word, residue in the end of a thread of processing cloth side, it can be short to the distance from the terminal point of buttonhole needle tracking to needle plate, and, kept by the bottom line maintaining body, can shorten to the end of a thread that residues in rotating shuttle one side the distance of needle plate.Therefore, the end of a thread that is sewed up when buttonhole next time is short, can be not ugly, and can sew up reliably.

In addition, reduced waste owing to the bottom line amount of drawing is little.

In addition, " transfer the processing cloth to a direction vertical at least ", be meant it also can is the meaning of the structure that can move to other direction with above-mentioned balancing point direction about the what is called of cloth feeding mechanism.

And, the bottom line maintaining body, its can be located at needle plate around, but also can be, or the tabular parts that can clamp bottom line are installed on needle plate particularly the distortion that is provided with of needle plate.

Or, also can constitute by needle plate and other parts as described in the claim 2.

Promptly, 1 described sewing machine for binding buttonhole according to the present invention, it is characterized in that of the present invention's 2 described inventions: the bottom line maintaining body is by being located on the needle plate, and the bottom line the end of a thread that has cut off imported the bottom line guide part (bottom line spigot surface 32f) in the buttonhole needle tracking that forms next time and bottom line presser feet parts (bottom line presser feet 27) that bottom line is pressed on the above-mentioned bottom line guide part constitute.

2 described inventions according to the present invention owing to be to use by bottom line presser feet parts bottom line is pressed in mode on the bottom line guide part the bottom line clamping, and when the buttonhole of next time by bottom line guide part guiding, can sew up reliably in the buttonhole needle tracking.In addition, if needle plate do little, and it is close to form the pin hole and the bottom line guide part of position of needle tracking, also can continue the end of a thread done one's utmost to remain to sew up needle tracking reliably, can't deviate from from needle tracking.

In addition, the bottom line maintaining body is except keeping, and the also double guiding parts of doing is so can make simplifying the structure of this part.

2 described sewing machine for binding buttonhole according to the present invention, the present invention's 3 described inventions, it is characterized in that: bottom line presser feet parts, it is driven by the driving mechanism shared with the bottom line shut-off mechanism (upper thread cuts off driving mechanism 60), and bottom line is pressed on the bottom line guide part.

3 described inventions according to the present invention, because bottom line presser feet parts, it is by being driven with the shared driving mechanism of bottom line shut-off mechanism, so can simplify the structure of integral body.In addition, because drive source is same, hardly can deviation so press bottom line and cut once regulating synchronously of bottom line.

2 or 3 described sewing machine for binding buttonhole according to the present invention, the present invention's 4 described inventions, it has: cut off the surface thread cut-off device (surface thread cut-off device 7) of upper thread and the upper thread cut-out drive unit (60) of drive surface wire cutter later at the buttonhole that is through with, it is characterized in that:

At least a side of bottom line shut-off mechanism and bottom line presser feet parts, it is driven by surface thread cut-off device.

3 described inventions according to the present invention are because at least one side of bottom line shut-off mechanism and bottom line presser feet parts driven by surface thread cut-off device, so can simplify the structure of integral body.

Any one described sewing machine for binding buttonhole of 2～4 according to the present invention, the present invention's 5 described inventions is characterized in that: it has can adjust bottom line guide part and bottom line presser feet parts for keeping the guiding mechanism (dogbolt 21 and nut 22) of the close minimum range of bottom line.

5 described inventions according to the present invention, owing to can adjust bottom line guide part and bottom line presser feet parts with guiding mechanism is to keep the close minimum range of bottom line, and can reach and confining force is met be held the thickness of bottom line or suitableization of character, so can be because of not deviating from making when beginning bottom line a little less than the confining force, or by force bottom line be cut off because of confining force on the contrary.In addition, from another viewpoint, the power in the time of also can adjusting the handing-over of bottom line guide part and bottom line presser feet parts, and can prevent when bottom line keeps the impact that it applies the needle plate of vitals.

Any one described sewing machine for binding buttonhole of 1～5 according to the present invention, the present invention's 6 described inventions, it is characterized in that: above-mentioned guide, it is made of above-mentioned rotating mechanism and above-mentioned cloth feeding mechanism, and after buttonhole, at first the processing cloth is transported to the peristome of needle plate, with rotating mechanism needle plate is rotated together with the rotating shuttle seat then, in order to be directed to the bottom line maintaining body pass pin hole and the bottom line that is connected of processing cloth outer circumference surface from above-mentioned rotating shuttle along needle plate with cloth feeding mechanism.

6 described inventions according to the present invention because it at first is directed to the bottom line that passes pin hole peristome, with rotating mechanism needle plate is rotated then with cloth feeding mechanism, and relatively guide bottom line and are directed on the bottom line maintaining body along the outer circumference surface of needle plate.In other words, needn't establish new mechanism in addition for guide but utilize the existing mechanism that is located on the sewing machine for binding buttonhole, thus with special-purpose mechanism be set compare its cost-saved and space.

And, suitably control the cloth feed amount of cloth feeding mechanism, it can change the amount of drawing of bottom line, consequently, can select to process the bottom line remaining lengths of cloth side, also can suitably change its free degree height to a certain extent.

In addition, the action of work feed and rotation, it also can only be used for the guiding of bottom line.And, also can utilize action of starting to next buttonhole, at this moment, on the time this point, do not need to be used for the actuation time of the guiding of bottom line, its efficient height yet.

Any one described sewing machine for binding buttonhole of 1～6 according to the present invention, the present invention's 7 described inventions are characterised in that: the bottom line maintaining body, it is set between the straight line of the inboard needle downing position that connects in the pin hole and outside needle downing position and the plane consistent location of the above-below direction vertical with this straight line.

7 described inventions according to the present invention, the bottom line maintaining body, because it is set between the straight line of the inboard needle downing position that connects in the pin hole and outside needle downing position and the plane consistent location of the above-below direction vertical with this straight line, so bottom line with the maintenance of bottom line maintaining body, it is led between inboard needle downing position and the outside needle downing position when buttonhole begins naturally, and is sewed up in the needle tracking reliably.

Any one described sewing machine for binding buttonhole of 1～7 according to the present invention, the present invention's 8 described inventions are characterised in that: the bottom line maintaining body, it is located at the below of pin hole.

8 described inventions according to the present invention because the bottom line maintaining body is located at the below of pin hole, so on needle plate, be formed for passing the hole of interstitial wire easily, can with whether need interstitial wire irrespectively to make the part generalization.

Any one described sewing machine for binding buttonhole of 1～8 according to the present invention, the present invention's 9 described inventions are characterised in that above-mentioned bottom line shut-off mechanism, it and transfer the processing cloth with cloth feeding mechanism before, cuts off bottom line after having kept bottom line with the bottom line maintaining body.

9 described inventions according to the present invention, because bottom line shut-off mechanism, it is after having kept bottom line with the bottom line maintaining body, and transfer the processing cloth with cloth feeding mechanism before cutting off with the bottom line that the processing cloth is connected from rotating shuttle, so not can as above-mentioned spy hold flat 9-225166 draw as described in announcing from rotating shuttle with process the long bottom line that cloth is connected.Thereby, the bottom line shut-off mechanism, it is in following bottom line cut-out that links to each other with the processing cloth from rotating shuttle of the state of doing one's utmost to shorten.That is, residue in the end of a thread of processing cloth side, it be the distance from the terminal point of buttonhole needle tracking to needle plate, and is kept by the bottom line maintaining body, that is to say that the end of a thread that residues in the rotating shuttle side has shortened to the length that arrives needle plate.Therefore, the end of a thread that is sewed up when next buttonhole is very short, can be good-looking, and can sew up reliably.

In addition, because the amount of drawing of bottom line is few, so reduced the waste of machine line.

Any one described sewing machine for binding buttonhole of 1～9 according to the present invention, the present invention's 10 described inventions are characterised in that: above-mentioned bottom line shut-off mechanism, it is arranged on the rotating shuttle seat.

10 described inventions according to the present invention, because the bottom line shut-off mechanism is arranged on the rotating shuttle seat, so off-position is fixed, the bottom line shut-off mechanism can be long irrelevant with seam, needn't be according to stitching the long part of regulating replacing bottom line shut-off mechanism etc., be not subjected to make the buttonhole of drift to the fixing restriction of button seam length.

Description of drawings

Fig. 1 is a sewing machine for binding buttonhole exemplary plot of the present invention, (a) is overall perspective view, (b) is the local side profile of support portion.

Fig. 2 is the structural plan figure that upper thread cuts off driving mechanism.

Fig. 3 is the device for cutting lower thread front plan view.

Fig. 4 is the side view of the device for cutting lower thread of Fig. 3.

Fig. 5 be from the device for cutting lower thread plane.

Fig. 6 is the stereogram of needle plate parts.

The control program figure of the sewing machine for binding buttonhole of Fig. 7 Fig. 1.

Fig. 8 is the action sequence diagram of the device for cutting lower thread of Fig. 3.

Fig. 9 is the hookup of Fig. 8.

The detailed plan view of the device for cutting lower thread of seeing from above when Figure 10 is Fig. 8 (c).

The detailed plan view of the device for cutting lower thread of seeing from above when Figure 11 is Fig. 8 (d).

The detailed plan view of the device for cutting lower thread of seeing from above when Figure 12 is Fig. 8 (e).

Figure 13 is before bottom line cuts off, and the bottom line of device for cutting lower thread cuts off the 2nd latch of tool arm and the state diagram that the rotating shuttle seat is abutted against.

Among the figure: 5-dextrorotation shuttle, the left-handed shuttle of 6-, 7-surface thread cut-off device (upper thread shut-off mechanism), the 10-sewing machine for binding buttonhole, 11-shank, 12-support portion (Sewing machines support), 14b-arm (sewing machine arm), 15-rotating mechanism (whirligig), 18-Sewing needles (eedle), 13-cloth pushing table (cloth feeding mechanism), 20-line cutting knife, 21-dogbolt (guiding mechanism), 22-nut (guiding mechanism), 24-bottom line presser feet mount pad, 26-bottom line cutter arm, 26d-protruding pin, 27-bottom line presser feet (pressing the bottom line parts), 27a-bottom line pressure surface, 30-device for cutting lower thread, 31-rotating shuttle seat, the 32-needle plate, the 32c-peristome, 32d-lower corner, 32e-periphery, 32f-bottom line spigot surface (bottom line guide part), the 60-upper thread cuts off driving mechanism, 69-tangent line actuating arm, and 86-machine line cuts off displacement cylinder, 78-upper thread cutting knife, the 81-Spindle Motor, W-buttonhole needle tracking, H-buttonhole.

The specific embodiment

Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Sewing machine for binding buttonhole of the present invention 10 shown in Figure 1 (below, abbreviate Sewing machines 10 as), it is a Sewing machines of controlling, use the chain-type stitch buttonhole automatically.Sewing machines 10, it can form various buttonhole needle trackings with the method for selecting figure.At this, for example around buttonhole H that the line part h2 by drop-shaped circle eye h1 and linearity shown in Fig. 9 (b) constitutes, it forms needle tracking W that lockstitches a border.Lock seaming needle tracking W, its by the circle eye seam w2 of portion, the left side seam w3 of portion around the right side seam w1 of portion, the circle eye h1, and straight line reinforce the seam w4 of portion and constitute.

The Sewing machines 10 of Fig. 1, it mainly has: the support portion 12 of slightly rectangular case shape, the vertical main body section 14a that erects from the rear portion of support portion 12, forwards stretch out the arm 14b of setting from vertical main body section 14a, it is carried on the sewing machine table (not shown) by lower cover 16.In the front portion of arm 14b, be provided with and can move up and down and direction (directions X of Fig. 1 (a)) balancing point motion to the left and right, have the shank 11 of the eedle 18 that passes upper thread in its bottom.

In addition, Sewing machines 10, also have the guidance panel 90 that is used for operating personnel and carries out various settings, and control Sewing machines 10-series makes the control device 110 (with reference to Fig. 7) of action.

In not shown arm 14b, be provided with along axle in the fore-and-aft direction extension.In addition, in support portion 12, be provided with the lower shaft that extends along fore-and-aft direction.To go up axle by synchronous belt and connect, and drive its synchronous rotation with Spindle Motor 81 with lower shaft.

Above-mentioned shank 11, it is by driving mechanism and needle vibrating mechanism and the last axle binding up and down of the not shown shank in the arm 14b.And, needle vibrating mechanism, it is identical with the well-known mechanism that sewing machine for binding buttonhole possessed in the past that mechanically adjusts the balancing point amplitude, the Therefore, omited explanation.In a word, the balancing point amplitude of this embodiment its be that machinery is adjusted and can be given first setting.

In support portion 12,, shank 11 has left-handed shuttle 6 that passes bottom line and the rotating shuttle seat 31 of assisting the dextrorotation shuttle 5 of left-handed shuttle 6 in the face of being provided with.Left and right

sides rotating shuttle

6,5, it links by not shown driving mechanism and lower shaft.Shank 11 and rotating shuttle seat 31, itself and in the past the same synchronization action of Sewing machines, and on upper thread, forms the needle tracking of lockstitching a border rolling off the production line by both co-operatings.

And, shank 11 and rotating shuttle seat 31, it links with the rotating mechanism (whirligig) 15 with rotation motor (rotation impulse motor) 84 and synchronous belt, and be the center rotation synchronously with vertical rotating shaft, and, around the drops eye h1 of buttonhole H, form radial needle tracking (the circle eye seam w2 of portion) with this.

On support portion 12, be provided with the processing cloth is located cloth pushing table (cloth feeding mechanism) 13 on it.Above the cloth pushing table 13, be provided with the presser feet 2 of pushing down the processing cloth in the both sides that should form buttonhole at this.

Cloth pushing table 13, its integral body is the casing of thin rectangular shape, and with X-axis motor 82 and the Y-axis motor 83 be located in the support portion 12, and by the control of CPU113, direction (directions X) and fore-and-aft direction (Y direction) are mobile to the left and right can to make it.

Be located at this cloth pushing table 13 under the state of origin position of regulation, and the formation of the buttonhole on the processing cloth that is carried in the above give allocation about, be provided with the cutting knife that is relatively fixed (not shown) and hold cutter platform 4.

Hold cutter platform 4 and be located at the rear of shank 11, and in the face of the support portion 12 of holding cutter platform 4, be provided with fixed cutting tool.Hold cutter platform 4, its 85 in cloth motor (impulse motor) of cutting of being located at its top drives up and down.

When making, at first, drive at origin position and to cut cloth motor 85, and make and hold cutter platform 4 and descend, and a processing cloth that is positioned to hold between cutter platform 4 and the fixed cutting tool is cut, and form buttonhole (being the circle buttonhole) H at this to fixed cutting tool.

Then, drive cloth pushing table 13 with the operation of starting switch 92 (Fig. 7), move it origin position the place ahead make the starting position, promptly handle be carried on processing cloth on the cloth pushing table 13 move to Sewing needles 18 under.Lock seaming around the buttonhole H, it is according to the bottom from the right side seam w1 of portion, via the circle eye seam w2 of portion, be sewn to the left side seam w3 of portion, is that the order that straight line is reinforced the seam w4 of portion is made at last.For by so the order make, cloth pushing table 13 begins to move from the above-mentioned starting position of making of Y direction, and the summit (leading section of circle buttonhole h1) that forwards moves to buttonhole H over against the state of Sewing needles, rearward turns back to and makes sewing finishing position much at one, starting position then.

Make an end, cloth pushing table 13 returns origin position with regard to controlled from the sewing finishing position.And during in the present embodiment processing cloth location, cloth pushing table 13 has moved to the position location of regulation.

In Sewing machines 10, on above-mentioned rotating shuttle seat 31, be provided with the surface thread cut-off device 7 and the device for cutting lower thread 30 that cut off upper thread and bottom line respectively.As described later, on Sewing machines 10, after sewing finishing, and cloth pushing table began before origin position moves, and cut off upper threads with surface thread cut-off device 7, and in position in the way of initial point, cut off bottom lines with device for cutting lower thread 30.

In the present invention, about surface thread cut-off device 7, because it is made of its detailed description of Therefore, omited well-known structure.But, cut off as the bottom line of feature of the present invention and to load 30, because it has utilized the drive source shared with surface thread cut-off device 7, so, at the following driving mechanism that surface thread cut-off device 7 at first is described.

The surface thread cut-off device 7 of upper thread shut-off mechanism, as shown in Figure 2, it is by upper thread cutting knife 78 grades of rotating shuttle seat 31 tops and cut off driving mechanism 60 along the upper thread of fore-and-aft direction configuration constitute in support portion 12.

Make the upper thread of upper thread cutting knife 78 actions cut off movement arm 78a, it can be installed on the installing component 31a that is fixed on the rotating shuttle seat 31 flexibly rotatably around the axle parallel with the fore-and-aft direction of Sewing machines 10.Cut off the top of movement arm 78a at this upper thread and fixing upper thread cutting knife 78.On Fig. 2,, only roughly represent support portion 12 with double dot dash line for simplifying device for cutting lower thread 30.

Cut off on the movement arm 78a at upper thread, hang with the end of not shown movement arm, and apply the pulling force that rotates to prescribed direction with spring, and make upper thread cutting knife 78 be positioned at the cut-out standby position of regulation with this movement arm with spring.In addition, upper thread cuts off the rotating fulcrum of movement arm 78a, and it is a central rotating shaft 42 described later.

On upper thread cut-out movement arm 78a, be provided with protuberance 78c, protuberance 78c resists above-mentioned movement arm and rotates to the direction opposite with prescribed direction with the upper thread cut-out movement arm 78a that spring tension uses upper thread cut-out driving mechanism 60 to push downwards, and cuts off action with this upper thread that carries out upper thread cutting knife 78.

Upper thread cuts off driving mechanism 60, its by thread cutting action cylinder 86, tangent line connecting rod 61, tangent line driving shaft 64, and cut off actuating arm 69 and constitute.

The root of thread cutting action cylinder 86, it can be supported on rotationally flexibly with

limit screw

66a, 66a and be fixed on the displacement cylinder carriage 66 in the support portion 12.And thread cutting action cylinder 86 can make to be installed on its anterior connecting rod 86a advance and retreat, and the overhang of connecting rod 86a is generally definite value.

At the leading section of connecting rod 86a, by displacement cylinder toggle 67, the end with the tangent line connecting rod 61 that slightly forms T word shape links rotationally.Can be bearing in the pars intermedia of tangent line connecting rod 61 rotationally in the support portion 12 flexibly with rotating shaft 61a.And, can link the other end of tangent line connecting rod 61 with the tangent line driving shaft 64 that almost extends along the vertical direction rotationally flexibly.Be provided with tangent line actuating arm 69 in the upper end of tangent line driving shaft 64.And when rotating shuttle seat 31 was positioned at the rotational angle of 180 degree, tangent line actuating arm 69 and upper thread were cut 78 protuberance 78c and are overlapped up and down, and if the protrudent pin 26d that bottom line described later cuts off loading 30 when 0 spends overlaps with tangent line actuating arm 69.

Cut off driving mechanism 60 according to upper thread, when the tangent line driving shaft 64 with the drive force of thread cutting action cylinder 86 moves up and down, cut off actuating arm 69 and move.

That is, as shown in Figure 2, under thread cutting action cylinder 86 closing state, connecting rod 86a is extended, and at this moment, cuts off the halted state that actuating arm 69 is in top dead-centre.In addition, in case connect thread cutting action cylinder 86, then connecting rod 86a is drawn back, and because of tangent line connecting rod 61 moves cut-out actuating arm 69 downwards to anticlockwise rotation, and be in the state that stops at bottom dead centre.Then cut off actuating arm 69 and downwards push protuberance 78c if rotating shuttle seat 31 is positioned at the position of turnback this moment, and be positioned at upper thread cutting knife 78 actions of cutting off standby position, and upper thread is cut off.Make thread cutting action cylinder 86 be in closing state once more, then cut off actuating arm 69 and move, and upper thread cutting knife 78 returns the cut-out standby position because of above-mentioned movement arm with the pulling force of spring to top dead-centre.

If rotating shuttle seat 31 is positioned at 0 degree turned position, then cuts off actuating arm 69 and drive device for cutting lower thread 30, and carry out bottom line and cut off.Will be to this in aftermentioned.

Below, the device for cutting lower thread 30 of bottom line shut-off mechanism is described.

At first, with reference to Fig. 3～Fig. 6 its structure is described.

Device for cutting lower thread 30, it is set on the rotating shuttle seat 31, is made of bottom line cutting knife 20 and bottom line presser feet 27, and is making the back near between left-handed shuttle 6 and processing cloth bottom line being cut off near the needle plate 32.Left-handed shuttle 6, it is fixed on the rotating shuttle mount pad 6a shown in Figure 4, and passes bottom line.In addition, this rotating shuttle mount pad 6a, it is to be the structure of a spot wobble with central rotating shaft 42 described later on the plane perpendicular to Fig. 4 drawing.Therefore, left-handed shuttle 6, it does the reciprocating motion of regulation below needle plate in making.And, above-mentioned dextrorotation shuttle 5, its also with the synchronously reciprocating motion of left-handed shuttle 6, and auxiliary passing of the action of the bottom line of left-handed shuttle 6 around the upper thread that passes eedle 18.

Bottom line cutting knife 20, it slightly is hook-shaped, and its radicle is fixed on the bottom line cutter arm 26 with limit screw, and moves simultaneously with bottom line cutter arm 26.

A side of the leading section of bottom line cutting knife 20, be the blade part 20a that cuts off bottom line.The 20b of the portion that dodges (Fig. 5) of the polishing that even the opposing party is the contact bottom line also not to be cut off.

Bottom line cutter arm 26, it is by fixing bottom line cutting knife 20 and crooked slightly halfway principal part 26a, extending to the right side of Fig. 3 from principal part 26a, and in bolt hole (not shown), insert the 1st dogbolt 33 the 26b of bolt support sector, extend to the left from principal part 26a, and the 26c of pin support sector that is fixing rearward outstanding protruding pin 26d constitutes.

The bottom of principal part 26a,, it is by can being installed in rotationally flexibly on the central rotating shaft 42 that is inserted on the installing component 31a, and be the center rotation with it.

The 1st dogbolt 33 of the 26b of bolt support sector, it is screwed into ormal weight in the screw of the 26b of bolt support sector, and its lower face 33a and rotating shuttle seat 31 are abutted against.And, in the middle of the 26b of bolt support sector, hang the end that bottom line cuts off spring 25 (Fig. 3 only represents a part, and all the other dot), the other end that this bottom line cuts off spring 25 is hung on the rotating shuttle seat.Bottom line cutter arm 26, usually cut off spring 25 by bottom line and apply clockwise pulling force to Fig. 3, and under original state, the lower face 33a of its 1st dogbolt 33 stops at the state that is abutted against with rotating shuttle seat 31, and cuts bottom line cutting knife 20 and dodge and do not hinder the position of making.That is, from the height (H1) of the 1st outstanding downwards dogbolt 33 of the 26b of bolt support sector, it has determined the initial position of bottom line cutter arm 26.

When the turned position of rotating shuttle seat 31 is 0 when spending, the protruding pin 26d of the pin 26c of support sector, it overlaps (Fig. 4) with above-mentioned cut-out actuating arm 69.

On the 26c of pin support sector, be screwed into the 2nd dogbolt 34, and its lower face 34a highlights from the 26c of pin support sector with measuring up/down perforation in accordance with regulations.When cutting off bottom line, the turned position of rotating shuttle seat 31 is 0 degree, and in a single day pushes protruding pin 26d with the decline of cutting off actuating arm 69, and then bottom line cutter arm 26 just overcomes bottom line cut-out spring 25, is driven by the counter clockwise direction to Fig. 3.At this moment, the lower face 34a of the 2nd dogbolt 34 just in time is abutted against with rotating shuttle seat 31, and it can not be rotated to counter clockwise direction again.So from the 26c of the pin support sector length of the 2nd outstanding dogbolt 34 downwards, it is that bottom line cutting knife 20 is used for cutting off reliably the necessary rotation distance of bottom line, and, do not determined the action final position of bottom line cutter arm 26 with not making waste motion.

In part shown in the inner face oblique line of principal part 26a, be smooth recessed concave surface 26e.Form side (following, the claim concave side) 26f of this concave surface 26e, when its counter clockwise direction in bottom line cutter arm 26 is rotated, but be abutted against with the bolt 36 of coaxial rotation, and by to same direction pushing.

Across needle plate 32 described later, in the face of bottom line cutting knife 20 is provided with bottom line presser feet 27.Bottom line presser feet 27, as shown in Figure 6, it is that the bottom line press surface 27a that is formed on the leading section 27f is pressed in the bottom line spigot surface 32f of needle plate 32 upward in order to keep the device of bottom line.

Bottom line presser feet 27, part is being inserted bottom line presser feet pin 28 in the central.The two ends of this bottom line presser feet pin 28 are supported on the bottom line presser feet mount pad 24, therefore, bottom line presser feet 27, it can be that rotate at the center with bottom line presser feet pin 28 with respect to bottom line presser feet mount pad 24.Bottom line presser feet mount pad 24, it is for to see that from the rear slightly being square sees semi-triangular shape from the side.

In addition, below bottom line presser feet mount pad 24, be provided with bottom line presser feet back-moving spring 23, and this bottom line presser feet back-moving spring 23, it is abutted against with bottom line presser feet mount pad 24 and rotating shuttle seat 31, even and apply and make direction bottom line presser feet mount pad 24 pressure of opening to expansion to rotating shuttle seat 31 directions between the two.

On the side of bottom line presser feet mount pad 24, be drilled with screw 24a (Fig. 5), and in this screw 24a, pass dogbolt 21.The side 31b of the front end of dogbolt 21 and installing component 31a is abutted against.Change the amount of being screwed into of 21 couples of screw 24a of dogbolt, in order to the distance of change with the side 31b of installing component 31a, therefore, the distance of above-mentioned leading section 27f and needle plate 32 is that the center changes with central rotating shaft 42 just.Specifically, be to adjust dogbolt 21, in order to the distance of holding bottom line with suitable trying hard to keep according to the bottom line spigot surface 32f of the bottom line press surface 27a of adjustment bottom line presser feets 27 such as the thickness of bottom line or characteristic and needle plate 32, and under this state fastening nut 22, and fixing dogbolt 21.That is, dogbolt 21 and nut 22 have constituted guiding mechanism of the present invention.

In addition, as mentioned above, bottom line presser feet mount pad 24 and bottom line presser feet 27, it is to apply to the pressure of pressing close to bottom line spigot surface 32f direction with 23 pairs of bottom line press surfaces of bottom line presser feet back-moving spring 27a.But dogbolt 21 is abutted against with the side 31b of installing component 31a, pushes to needle plate 32 sides in order to prevent bottom line presser feet 27 again.That is, also can be described as the method for adjusting with guiding mechanism, prevent that bottom line presser feet 27 from giving the intense impact of needle plate 32.

In addition,, can be roughly 0mm when for example wanting firmly to keep bottom line, when bottom line is quite thick, keep the distance of this bottom line thickness to get final product about the distance of bottom line presser feet 27 with bottom line spigot surface 32f.

Bottom line presser feet 27, its leading section 27f, in the centre to the above-mentioned bottom line spigot surface 32f of needle plate 32 bending.The details of leading section 27f remains aftermentioned.

The bottom 27g of bottom line presser feet 27, the opening that it has formed two forks reverse U shapes separately passes latch 29 (Fig. 3 and Fig. 4) in this opening.The head of latch 29 leans on mutually with bottom 27g as shown in Figure 3, and its opposing party's front end is fixed on the bottom line presser feet mount pad 24.And, around the axle of latch 29 bottom line presser feet spring 40 has been installed in the inboard of bottom 27g.With this bottom line presser feet spring 40 the bottom 27g of bottom line presser feet 27 is rearward swung, and with the side 32h (the shade display part of Fig. 6) of foot's 38 sides of this needle plate 32, push in the face of the side 32h of the triangle tapering 27c of leading section 27f to side 27d.Thereby, with bottom line presser feet spring 40 pushing bottom 27g, and be abutted against with the head inner face of latch 29, so bottom line presser feet 27 its bottom 27g can not continue rearward to swing, and make dividing potential drop side 32h only to side 27d.

In addition, side 32h and the enlarged drawing that side 27d is abutted against state on Figure 11 (b), have been shown.

The inboard of bottom line presser feet mount pad 24, it extends to the below of bolt 37, and becomes extension 24c.On extension 24c, overlap, and feeding through to bottom line with its formation size, to cut off the bottom line presser feet fulcrum block 35 of flat board of lower inside of principal part 26a of arm 26 overlapping, and extension 24c and bottom line presser feet fulcrum block 35, comes down to be fixed together with screw 36.And, on extension 24c, formed the vertical slotted hole that is used to pass screw 36, and, be fixed with screw 36 having regulated under the state of extension 24c (bottom line presser feet mount pad 24) with respect to the height and position of bottom line presser feet fulcrum block 35.

In the bottom of bottom line presser feet fulcrum block 35, pass above-mentioned central rotating shaft 42, and bottom line presser feet fulcrum block 35 and bottom line presser feet mount pad 24 are that the center can be rotated flexibly with central rotating shaft 42.

Above-mentioned concave side 26f, its in bottom line cutter arm 26 when counter clockwise direction is rotated, bottom line presser feet fulcrum block 35 and bottom line presser feet mount pad 24 push screw 36 together, and with this make bottom line presser feet mount pad 24, to be bottom line presser feet 27 counterclockwise rotate for middle mind-set with central rotating shaft 42.

Needle plate 32, as shown in Figure 6, it has the pin hole 32b that passes eedle 18, and is supported by the foot 38 that central authorities have formed screw 38a.Needle plate 32, it is fixed on the installing component 31a by the screw on the screw 38a.

Pin hole 32b, its be made into when lock seaming eedle 18 can be in pin hole 32b the shape of growing crosswise of balancing point.Fig. 5 is the interior needle downing position figure of pin hole 32b that represents with some P1, some P2.When making, some P1 is the inboard needle downing position near buttonhole, and some P2 is from buttonhole outside needle downing position far away (with reference to Fig. 9 (d)).And the particular location with respect to pin hole 32b of some P1, some P2 can suitably change.

32b is continuous with pin hole, and the part of needle plate 32 is formed peristome 32c with cutting away.And the pin hole 32b from Fig. 6 forms the edge part 32e of left hand circular-arc, and its lower corner 32d (part shown in the thick line) chamfering and grinding.As described later, before the cut-out after making, bottom line, its relatively from peristome 32c come out and along lower corner 32d towards bottom line spigot surface 32f, this moment is because lower corner 32d be circular, and is polished, so that bottom line can not drawn redundance ground is mobile glidingly.

In foot 38, it is narrower and form continuous bottom line spigot surface (bottom line guide part) 32f below needle plate 32 on its side that the top of screw 38a is formed width.This bottom line spigot surface 32f, be and be formed at the mechanism of the bottom line after clamping is cut off between the bottom line press surface 27a on the leading section 27f of bottom line presser feet 27.That is to say that bottom line spigot surface 32f and bottom line presser feet 27 have constituted bottom line maintaining body of the present invention.

Bottom line spigot surface 32f, it is arranged in the plane of the centre of the inboard needle downing position P1 of connection and outside needle downing position P2 straight line in the pin hole 32b and the above-below direction vertical with this straight line.Be maintained at the bottom line on the bottom line maintaining body, it is almost consistent with above-mentioned plane, is directed to naturally to sew up in the lock seaming needle tracking when making beginning.

And, on the leading section 27f of bottom line presser feet 27, formed the raised face 27b that also protrudes than bottom line press surface 27a.This raised face 27b, its with form at the top of foot 38 rear side have the trailing flank 32g face of step to contact with bottom line spigot surface 32f.And as mentioned above, on leading section 27f on, form the triangle tapering 27c of triangle taper.This triangle tapering 27c to side 27d, its side 32h with the edge part 32e of needle plate 32 contacts.

Between bottom line spigot surface 32f and bottom line press surface 27a during the clamping bottom line, raised face 27b and trailing flank 32g, it contacts with side 32h respectively with to side 27d, with this bottom line is escaped.

Shown in Figure 7 is the control device 110 of Sewing machines 10.

Control device 110 shown in Figure 7, it is by formations such as ROM (Read Only Memory) 111, RAM (Random Access Memory) 112, CPU (Central Processing Unit) 113, EEPROM (Electrically Erasable and Programmable Read Only Memory) 115.

Control device 110 is connected with guidance panel 90, starting switch 92 by interface 114, and, with Spindle Motor 81, X-axis motor 82, Y-axis motor 83, rotation motor 84, cut various actuators such as cloth motor 85, thread cutting action cylinder 86 and be connected.

In addition, at interface 114 and Spindle Motor 81, X-axis motor 82, Y-axis motor 83, rotation motor 84, cut and be useful on Spindle Motor driver circuit 81a, the X-axis motor driver circuit 82a, Y-axis motor driver circuit 83a, the rotation motor driver circuit 84a that drive each motor between the cloth motor 85, cut cloth motor driver circuit 85a, and thread cutting action cylinder driving electromagnetic valve 86a is arranged between interface 114 and thread cutting action cylinder 86.

And, on control device 110, connecting X-axis origin sensor 82b, the Y-axis origin sensor 83b, the rotation origin sensor 84b that are used to detect X-axis motor 82, Y-axis motor 83, rotation motor 84, cut each origin position of cloth motor 85, cutting cloth origin sensor 85b by interface 114.

In ROM111, solidified and be used to control Spindle Motor 81, X-axis motor 82, Y-axis motor 83, rotation motor 84, cut various actuators such as cloth motor 85, thread cutting action cylinder 86 and carry out control program and the control data that buttonhole is made.

EEPROM115, it is to have stored a plurality of graph datas, and also stores this numerical value when having changed the data items numerical value in the graph data by guidance panel 90.In addition, RAM112, when it has various handle in making as the function of the temporary transient memory that uses.So-called graph data for example is meant, necessary a series of setting data during the formation buttonhole needle tracking of seam length, pin number etc.

CPU113, just according to control program and the control data of ROM111, and control comprises Qie Bu, makes, and upper thread cuts off, bottom line cuts off processing a series of processing relevant with buttonhole from starting switch 92 input enabling signals for it.

That is, CPU113, it uses the rotation of the Spindle Motor driver circuit 81a drive controlling Spindle Motor 81 that connects by interface 114.Spindle Motor 81, the axle of going up that it drives eedle 18 up and down and drives left and right sides balancing point, and with eedle 18 co-operatings and form the rotary shuttle mechanism of needle tracking.

In addition, CPU113, it uses X-axis motor driver circuit 82a, Y-axis motor driver circuit 83a one side drive controlling X-axis motor 82, the Y-axis motor 83 that connects by interface 114, on one side to prescribed direction driving cloth pushing table 13.

And, CPU113, it is with passing through the rotation motor driver circuit 84a drive controlling rotation motor 84 that interface 114 connects.Make eedle 18 and rotating shuttle seat 31 rotate (rotation) with this rotation motor 84, and around circle eye h1, form the circle eye needle tracking w2 of portion (with reference to Fig. 9 (b)) of radial needle tracking.

In addition, CPU113, it uses the cloth motor driver circuit 85a drive controlling of cutting that connects by interface 114 to cut cloth motor 85 and make and hold cutter platform 4 and move up and down.

In addition, CPU113, the time point that it is stipulated after sewing finishing drives electromagnetic valve 86a with the thread cutting action cylinder that connects by interface 114 and drives thread cutting action cylinder 86.

In above-mentioned a series of processing, CPU113, it detects on one side X-axis origin sensor 82b, Y-axis origin sensor 83b, rotation origin sensor 84b respectively, cuts the state of cloth origin sensor 85b, drives X-axis motor 82, Y-axis motor 83, rotation motor 84 on one side, cuts cloth motor 85, and with this control the moving of cloth pushing table 13, shank 11 and rotating shuttle seat 31 the anglec of rotation, hold the down position of cutter platform 4 etc.

Below, with reference to Fig. 3, Fig. 4 and Fig. 8～Figure 13, be the action that the center explanation has the Sewing machines 10 of said structure with device for cutting lower thread 30.Among Fig. 8 and Fig. 9, the buttonhole needle tracking W that expression is formed on the processing cloth S (Fig. 4) is overlapping with the parts of processing needle plate 32 grades under the cloth S.And with dashed lines and stain are represented the bottom line T, particularly stain that derive from left-handed shuttle 6, and its expression and needle plate 32 are roughly in the position of the bottom line of sustained height.And omit the upper thread that links to each other with eedle 18 from buttonhole needle tracking W.

Buttonhole H and buttonhole needle tracking W make, and it ends at straight line and reinforces making of seam W4.At this moment, shown in Fig. 8 (a), it is parallel that the length direction of the pin hole 32b of needle plate 32 and straight line are reinforced the balancing point direction of seam W4, and the turned position that is in rotating shuttle seat 31 is the states of 270 degree.The bottom line cutting knife 20 of this moment, the leading section 27f of bottom line presser feet 27, rotating shuttle 6 concern as shown in the figure with the position of needle plate 32.It is the state of Fig. 3.The bottom line press surface 27a of the bottom line spigot surface 32f of needle plate 32 and bottom line presser feet 27 is a contact condition.

Then, drive rotating mechanisms 15 with rotation motor 84, and rotating shuttle seat 31 is to returning 90 degree clockwise, its position of rotation is 1 80 degree.At this moment, the bottom line T in the pin hole 32b, it moves on to the being seen position, rear of peristome 32c.On the position of rotation of these 180 degree, drive thread cutting action cylinder 86 and cut off upper thread with upper thread cutting knife 78.

Then, drive Y-axis motor 83, in order to the rearward mobile predetermined distance of cloth pushing table 13 (is equivalent to the distance from pin hole 32b to peristome 32c, for example about 4mm), as Fig. 8 (c) or shown in Figure 10, the bottom line T continuous with the sewing finishing position of buttonhole needle tracking W also moves, and arrives peristome 32c.As shown in figure 10, the protruding pin 26d of bottom line cutter arm 26 is positioned at and tangent line actuating arm 69 antipodal positions.In addition, near the white point the needle plate 32 of Figure 10～Figure 12, the bottom line T during its expression preceding state.

Subsequently, the position of rotation with 0 degree is that the target rotation drives rotating shuttle seat 31.Therefore, needle plate 32 arrives the bottom line T of peristome 32c to clockwise rotating, and as Fig. 8 (d) and shown in Figure 11, its one side contacts with the lower corner 32d of the edge part 32e of needle plate 32, to opposite counter clockwise direction guided on one side.

Then, as Fig. 8 (e) and shown in Figure 12, position of rotation is 0 degree, and bottom line T arrives the position between the bottom line press surface 27a of the bottom line spigot surface 32f enter needle plate 32 and bottom line presser feet 27.Fig. 4 of front be the state of the position of rotation of this 0 degree, and the protruding pin 26d of bottom line cutter arm 26 is positioned at the below of tangent line actuating arm 69.So, utilize the motion guiding bottom line of rotating mechanism 15 and cloth pushing table 13, it is a guide of the present invention.

Action when its expression rotating shuttle seat 31 of dotted line A, the B of Fig. 4, C rotates with respect to the bottom line T of needle plate 32.That is, on Fig. 8 (a) and (b), bottom line T such as dotted line A are shown in the pin hole 32b.Subsequently, under the state of Fig. 8 after cloth pushing table 13 moves (c), shown in dotted line B, it arrives peristome 32c.And because of needle plate 32 rotates the state that 180 degree are in Fig. 8 (e), this moment, then shown in the dotted line C of Fig. 4, it covered the only way which must be passed of bottom line cutting knife 20.

Fig. 8 (e) drives thread cutting action cylinder 86 cut-out actuating arm 69 is descended, and protrudent pin 26 is pressed to the below afterwards.Overcome the pulling force that bottom line cuts off spring 25 with this, and to make bottom line cutter arm 26 and bottom line cutting knife 20 be that the center begins the counter clockwise direction rotation to Fig. 3 with central rotating shaft 42 simultaneously.At this moment, bottom line is not dodged with the 20b of the portion that dodges of bottom line cutting knife 20 slips over with cutting off.

And on the way, with the concave side 26f pressure bolt 36 of bottom line cutter arm 26 inboards, and bottom line presser feet 27 is that middle mind-set equidirectional rotates with bottom line presser feet mount pad 24 with central rotating shaft 42 also.Therefore, shown in Fig. 8 (f), the blade part 20a of bottom line cutting knife 20 crosses over bottom line T fully, and the leading section 27f of bottom line presser feet 27 also leaves slightly from needle plate 32.Stop at the bottom line of bottom line presser feet 27 and needle plate 32 contact portions, its be in as shown in Figure 6 with bottom line spigot surface 32f state of contact.The spinning movement of bottom line cutter arm 26 (bottom line cutting knife 20) and bottom line presser feet 27, as shown in figure 13, it stops at the position that the 2nd dogbolt 34 and rotating shuttle 31 are abutted against.

In addition, bottom line presser feet 27, as mentioned above, the pressure that its leading section 27f has been applied to needle plate 32 by bottom line presser feet spring 40, but owing to carried out not excessive restriction with latch 29, so, leading section 27f is no more than the ledge that forms circular-arc edge part 32e.

Tangent line actuating arm 69 just returns upward in case thread cutting action cylinder 86 recovers.Therefore, bottom line cutting knife 20 and bottom line cutter arm 26 are subjected to the pulling force that bottom line cuts off spring 25, and bottom line presser feet 27 and bottom line presser feet mount pad 24 are subjected to the pressure of bottom line presser feet back-moving spring 23, the beginning homing action.

When the homing action, because bottom line presser feet 27, its leading section 27f is subjected to the pressure of bottom line presser feet spring 40 to needle plate 32, thus above-mentioned triangle tapering 27c to side 27d, it contact mobile on one side on one side with the edge part 32e of needle plate 32.Bottom line presser feet 27 1 turns back to the position that the side 31b of dogbolt 21 and installing component 31a is abutted against, and then bottom line press surface 27a just pushes down the bottom line T that passes across bottom line spigot surface 32f, and uses both clampings.At this moment, raised face 27b and trailing flank 32g, side 27d and side 32h are abutted against respectively mutually, do not allow escaping of bottom line T.

After clamping bottom line T with bottom line spigot surface 32f and bottom line press surface 27a, the blade part 20a of bottom line cutting knife 20 cuts off bottom line T at once, and returns initial position shown in Fig. 9 (a).

When making beginning next time, at first, drive and cut cloth motor 85 and form buttonhole H at the origin position of cloth pushing table 13, then, cloth pushing table 13 is forwards delivered to the sewing position of regulation, shown in Fig. 9 (c), and begin to make from right side seam W1.The bottom line T that links to each other with left-handed shuttle 6 that was cut off after making last time and keeps, because the spigot surface of using bottom line spigot surface 32f and bottom line press surface 27a formation is between the inboard needle downing position and outside needle downing position of pin hole 32b, so along with needle plate 32 relatively rearward moves, shown in Fig. 9 (d), be cut off after making last time and the bottom line T that links to each other with left-handed shuttle 6 that keeps is just sewed up in the needle tracking naturally.

In addition, in Fig. 9 (c), (d), the position of the eedle during white point is represented to make, and omitted the bottom line of supplying with from left-handed shuttle 6 that is used to make.

According to above-mentioned Sewing machines 10, it is behind the buttonhole that is through with, at first with cloth pushing table 13 passing from left-handed shuttle 6 and processing the bottom line T that cloth S is connected and be directed to peristome 32c, make needle plate 32 rotation with rotating mechanism 15 then, and relatively guide to bottom line spigot surface 32f along the lower corner 32d of needle plate 32 peripheries.Before transferring the processing cloth with cloth pushing table 13, device for cutting lower thread 30 cuts off the bottom line that the bottom line press surface 27a with bottom line spigot surface 32f and bottom line presser feet 27 keeps in its vicinity.

That is,, draw long line as described in the flat 9-225166 bulletin so needn't open as above-mentioned spy because bottom line T is directed into the bottom line spigot surface 32f at needle plate 32 rear portions from pin hole 32b through peristome 32c.

Thereby, residuing in the end of a thread of processing cloth side after cutting off, it is the distance from the terminal point of buttonhole needle tracking to needle plate 32 just, and is held in the bottom line maintaining body, promptly can shorten to the end of a thread that residues in rotating shuttle 6 sides the length of needle plate 32.Therefore, because the end of a thread that is sewed up when lockstitching a border has been lacked next time, so not ugly.

In addition, owing to device for cutting lower thread 30 is arranged on the rotating shuttle seat 31, so can bottom line be cut off at assigned position with respect to buttonhole needle tracking position.What is called is with respect to the off-position of the assigned position of buttonhole needle tracking position, be meant that the bottom line shut-off mechanism is long irrelevant with seam, do not need according to seam longly regulate the part of changing the bottom line shut-off mechanism etc., also not made length can not surpass the restriction of prescribed limit, and can make the buttonhole needle tracking of drift.

And, because of the waste of the little machine line of the amount of drawing of bottom line also few.

Because the end of a thread is short, with the bottom line press surface 27a of bottom line presser feet 27 bottom line is pressed in and remains on that bottom line spigot surface 32f goes up and bottom line spigot surface 32f has been located in the plane of the centre of the inboard needle downing position P1 of connection and outside needle downing position P2 straight line in the pin hole 32b and the above-below direction vertical with this straight line again, so bottom line sews up in the needle tracking of lockstitching a border making to be directed to naturally when beginning next time.

In addition, needle plate do very little, and, bottom line press surface 27a and the bottom line spigot surface 32f relative with it are made the maximum length of permission in the direction of pin hole 32b, make to be positioned at the close pin hole 32b of the pin hole 32b that forms the needle tracking position, so sustainable maintenance just sews up the end of a thread fully.

In addition, with the method for suitably controlling the conveying capacity of cloth pushing table 13, can select to process the bottom line remaining lengths of cloth S side, and also can suitably do certain change, so free degree height.

And, owing to utilize cloth pushing table 13 and the rotating mechanism guiding bottom line that just is located at originally on the sewing machine for binding buttonhole, so if the mechanism special-purpose with guiding is set compares its cost-saved and space.

In addition, before cut-out, promptly bottom line from processing cloth S to rotating shuttle 6 connect can not free movable state under owing at first kept bottom line, so can keep reliably.And, under the state that keeps certain tension force, cut off bottom line, so can cut off bottom line reliably.

Because bottom line presser feet 27 and bottom line cutting knife 20, be by cutting off the shared drive mechanism of driving mechanism 60, so can simplify whole structure with upper thread.And because drive source is same, if the clamping of once regulating bottom line then with cut off bottom line do not have deviation synchronously.

In addition, owing to use the guiding mechanism that constitutes by dogbolt 21 and nut 22, can adjust the minimum range of bottom line presser feet 27 near bottom line spigot surface 32f, so can be according to the thickness and the character of bottom line, reach suitableization of confining force, so can not deviate from, or cross because of confining force on the contrary and break bottom line by force because of bottom line a little less than the confining force.In addition, on the other hand, the power when it also can regulate the contact of 27 pairs of bottom line spigot surfaces of bottom line presser feet 32f, and when the maintenance of bottom line, prevent impact that strength member needle plate 32 is applied.

Because bottom line spigot surface 32f, it is arranged on the below of pin hole 32b, thus can form almost with needle plate on pin hole 32b in the conplane hole that is used for by interstitial wire, for example can form hole in the position shown in the symbol R of Fig. 6 by interstitial wire.Thereby, can with whether want interstitial wire irrespectively to make the part generalization.

And, the present invention, it is not limited to the foregoing description.

For example, in the present embodiment, be that the bottom line shut-off mechanism is located on the rotating shuttle, except shortening from rotating shuttle and the end of a thread that the processing cloth links to each other, also needn't be according to the long structure of changing bottom line shut-off mechanism part of regulating of seam, but if only be used to shorten the end of a thread that links to each other with the processing cloth from rotating shuttle, its bottom line shut-off mechanism is not limited to above-mentioned structure.Promptly, can when the bottom line maintaining body keeps the processing cloth, bottom line not drawn long yet, even for example above-mentioned spy of bottom line shut-off mechanism drives the described bottom line shut-off mechanism that is fixed on the cloth pushing table of bulletin 2001-232086 number, also can be before bottom line keeps back handover processing cloth, with the method that drives the bottom line shut-off mechanism, shortening is also cut off the end of a thread that is connected with the processing cloth from rotating shuttle.

In addition, also be applicable to form and the difform reinforcing seam of the foregoing description, or do not have the sewing machine for binding buttonhole of the buttonhole needle tracking of reinforcing seam, and also be applicable to the Sewing machines that around the straight buttonhole that is not the circle eye, carries out buttonhole.

In addition, in above-mentioned, be after keeping, to cut off bottom line immediately, still, can certainly just not keep the back just to cut off, but before the processing cloth, cutting off bottom line.

In addition, in the foregoing description, be to keep cutting off the structure of back bottom line with the bottom line press surface 27a of the bottom line spigot surface 32f of needle plate and bottom line presser feet, but also can be provided with and holding member that leaf spring constitutes at the rear portion of needle plate.According to so constructing the not above-mentioned bottom line presser feet 27 of needs, make structure simpler.

In addition, with the structure of the lower corner 32d guiding bottom line of the edge part 32e of needle plate 32, also can be the bottom line that the peristome 32c from needle plate 32 is drawn to the outside of needle plate 32, along the structure of the miscellaneous part guiding of installing component 31a etc.

1 described the present invention according to the present invention can after the buttonhole needle tracking finishes, use guide From rotating shuttle by pin hole and the bottom line that is connected of processing cloth, draw from the peristome of needle plate, And remain on the bottom line maintaining body of being located at around the needle plate, and under this state, be breaking at bottom line and revolve Cut off bottom line between shuttle and the processing cloth. That is to say, only bottom line is guided to via peristome from pin hole Bottom line maintaining body around the needle plate is so needn't draw as described in above-mentioned Unexamined Patent 9-225166 bulletin Go out so long.

Thereby, use the bottom line shut-off mechanism, can do one's utmost to shorten the bottom line that is connected with the processing cloth from rotating shuttle State under cut off bottom line. That is, residue in the end of a thread of processing cloth side, its can be from the lock seaming needle tracking to The degree of the distance of needle plate, and can shorten to the length of needle plate. Therefore, when next buttonhole by In having shortened the end of a thread of sewing up and can be not ugly, and can sew up reliably the end of a thread.

And, because of the few waste that reduces line of the amount of drawing of bottom line.

2 described the present invention according to the present invention are owing to be pressed in bottom line to bottom line with the bottom line pressing component So method clamping bottom line on the guide part, and leading with guide part when buttonhole next time is can Sew up needle tracking by ground. And, if needle plate do very little, then the bottom line guide part approach to form the needle tracking position The pin hole of putting can continue to keep to sew up fully the end of a thread of the limit of needle tracking, can not deviate from from needle tracking.

Therefore, the bottom line maintaining body is except keeping, and so the double usefulness of doing guiding parts also is can letter Change this section construction.

3 described the present invention according to the present invention, bottom line presser feet parts are because it is cut off with bottom line The driving mechanism that mechanism shares drives, so can simplify whole structure. In addition, owing to drive Moving source is same, thus behind the Primary regulation bottom line presser feet with cut off bottom line do not have synchronously a deviation.

4 described the present invention according to the present invention are because bottom line shut-off mechanism and bottom line presser feet parts are extremely Rare one is cut off driving mechanism by upper thread and drives, so can simplify whole structure.

5 described the present invention according to the present invention are owing to can adjust the bottom line guide part with guiding mechanism Part and bottom line presser feet parts be used for to keep the minimum approach distance of bottom line, and can be according to the bottom line that keeps Thickness and character reach the rationalization of confining force, so can be because not taking off when making beginning a little less than the confining force End of a year or month line, or cross because of confining force on the contrary and cut off by force bottom line. In addition, on the other hand, it can Pressure when contacting with the bottom line guiding parts to adjust bottom line presser feet parts, and can be anti-when keeping bottom line The needle plate that ends strength member applies impact.

6 described the present invention according to the present invention are because it at first passes pin hole with cloth feeding mechanism handle Bottom line is directed to peristome, with rotating mechanism needle plate is rotated then, and relatively along the cylindrical of needle plate Side face guiding bottom line also is directed on the bottom line maintaining body. In other words, needn't establish in addition for guide New mechanism but utilize the existing mechanism that is located on the sewing machine for binding buttonhole, thus with arrange special-purpose Mechanism compares, its cost-saved and space.

And, suitably control the cloth feed amount of cloth feeding mechanism, it can change the amount of drawing of bottom line, its The result is, bottom line remaining lengths that can Choice and process cloth side also can suitably change to a certain extent, Its free degree height.

7 described inventions according to the present invention, the bottom line maintaining body is because it is arranged on connecting needle Between inboard needle downing position in the hole and the straight line of outside needle downing position and the upper and lower vertical with this straight line To consistent position, plane, so the bottom line that keeps with the bottom line maintaining body, it begins at buttonhole In time, led between inboard needle downing position and the outside needle downing position naturally, and sewed up needle tracking reliably In.

8 described inventions according to the present invention, because the bottom line maintaining body is located at the below of pin hole, So on needle plate, be formed for easily passing the hole of interstitial wire, can with whether need interstitial wire irrespectively Make the part generalization.

9 described inventions according to the present invention, because the bottom line shut-off mechanism, it is keeping machine with bottom line Structure has kept after the bottom line, and transfer the processing cloth with cloth feeding mechanism before from rotating shuttle and processing cloth The bottom line that material connects cuts off, thus can as draw as described in the above-mentioned Unexamined Patent 9-225166 bulletin from The long bottom line that rotating shuttle is connected with the processing cloth. Thereby, bottom line shut-off mechanism, the shape that it is doing one's utmost to shorten Lower bottom line cut-out that links to each other with the processing cloth from rotating shuttle of attitude. That is, residue in the end of a thread of processing cloth side, It is the distance from the terminal point of buttonhole needle tracking to needle plate, and is kept by the bottom line maintaining body, also The end of a thread that residues in other words the rotating shuttle side has shortened to the length of needle plate. Therefore, at next buttonhole The time the end of a thread of being sewed up very short, can be good-looking, and can sew up reliably.

10 described inventions according to the present invention are because the bottom line shut-off mechanism is arranged on the rotating shuttle seat institute Fix with off-position, the bottom line shut-off mechanism can be long irrelevant with seam, needn't regulate more according to seam is long The part of line cut-off machine structure etc. that refoots is not subjected to can make the fixing restriction of button seam length freely long The buttonhole of degree.

Claims

1. sewing machine for binding buttonhole has:

Rotatably be located on the sewing machine arm, and supporting is passed the eedle of upper thread and is moved up and down, and make eedle replace the pin that falls from buttonhole outside needle downing position far away with near inboard needle downing position on the cloth being formed at processing, and balancing point direction in accordance with regulations carry out shank that balancing point moves,

Be located on the Sewing machines support, and at least to a direction vertical with described balancing point direction transfer the processing cloth cloth feeding mechanism,

Rotatably be located in the face of described shank on the Sewing machines support and have with described shank co-operating and the rotating shuttle seat of the rotating shuttle of bottom line on the described upper thread,

Be positioned on the rotating shuttle seat be provided with above the rotating shuttle formed the needle plate that comprises described inboard needle downing position and 2 pin holes of outside needle downing position,

When buttonhole, make shank and rotating shuttle seat the rotation rotating mechanism,

The device for cutting lower thread that after the buttonhole needle tracking finishes, the bottom line that is connected between rotating shuttle and the processing cloth is cut off,

The bottom line that maintenance links to each other with rotating shuttle before cutting off with described device for cutting lower thread, and the handover of when cutting off later buttonhole next time, processing cloth with described cloth feeding mechanism handle, and keep the end of a thread to be sewed up bottom line maintaining body among the needle tracking naturally, it is characterized in that:

Buttonhole around form on the sewing machine for binding buttonhole of buttonhole needle tracking, its bottom line maintaining body be arranged on needle plate around,

On needle plate, be provided with the bottom line the end of a thread that has cut off import in the buttonhole needle tracking that forms next time the bottom line guide part and from pin hole continuously to the peristome of side's opening,

And has a guide, it is after buttonhole finishes, and before bottom line cuts off, with the rotation of described rotating shuttle seat explicitly from rotating shuttle pass pin hole and be connected on the processing cloth bottom line according to draw from described peristome and by the mode of described bottom line maintaining body maintenance by the channeling conduct of described bottom line guide part.

2. sewing machine for binding buttonhole according to claim 1 is characterized in that: have bottom line presser feet parts, it is located on the described rotating mechanism, and bottom line is pressed on the described bottom line guide part.

3. sewing machine for binding buttonhole according to claim 2 is characterized in that:

Bottom line presser feet parts are driven with the shared driving mechanism of device for cutting lower thread, and bottom line is pressed on the bottom line guide part.

4. according to claim 2 or 3 described sewing machine for binding buttonhole, it is characterized in that:

Have: cut off the surface thread cut-off device of upper thread and the upper thread cut-out drive unit of drive surface wire cutter later at the buttonhole that is through with,

At least a side of device for cutting lower thread and bottom line presser feet parts, it is driven by surface thread cut-off device.

5. according to claim 2 or 3 described sewing machine for binding buttonhole, it is characterized in that: it has can adjust bottom line guide part and bottom line presser feet parts for keeping the guiding mechanism of the close minimum range of bottom line.

6. sewing machine for binding buttonhole according to claim 1 and 2, it is characterized in that: described guide is made of described rotating mechanism and described cloth feeding mechanism, and after buttonhole, at first the processing cloth is transported to the peristome of needle plate, with rotating mechanism needle plate is rotated together with the rotating shuttle seat then, passing pin hole from described rotating shuttle and processing bottom line that cloth is connected outer circumference surface and be directed to the bottom line maintaining body along needle plate with cloth feeding mechanism.

7. sewing machine for binding buttonhole according to claim 1 and 2 is characterized in that: the bottom line maintaining body is set between the straight line of the inboard needle downing position that connects in the pin hole and outside needle downing position and the plane consistent location of the above-below direction vertical with this straight line.

8. sewing machine for binding buttonhole according to claim 1 and 2 is characterized in that: the bottom line maintaining body is located at the below of pin hole.

9. sewing machine for binding buttonhole according to claim 1 and 2 is characterized in that: described device for cutting lower thread and cut off bottom line transfer the processing cloth with cloth feeding mechanism before after having kept bottom line with the bottom line maintaining body.

10. sewing machine for binding buttonhole according to claim 1 and 2 is characterized in that:

Described device for cutting lower thread, it is arranged on the rotating shuttle seat.