CN1386925A

CN1386925A - Thread cutting device for sewing machine

Info

Publication number: CN1386925A
Application number: CN02120318A
Authority: CN
Inventors: 坂本真一
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2001-05-23
Filing date: 2002-05-22
Publication date: 2002-12-25
Anticipated expiration: 2022-05-22
Also published as: DE10222759A1; JP2002346266A; CN1277972C; KR20020090143A

Abstract

A thread cutter for a sewing machine is provided with: a first blade 3 reciprocated over the fall position of a sewing needle 15 with a pulse motor 6; a second blade 4 reciprocated with an air cylinder 7 between a standby position separated from one side of the fall position of the sewing needle and a cutting position where the thread is cut in cooperation with the first blade when sewing is completed; a third blade 5 for cutting the thread in cooperation with the first blade when sewing is started between an initial position separated from the other side of the sewing needle fall position and a position after movement by a fixed distance from the initial position in conjunction with the movement of the first blade to the side of the second blade; and a cramp board 51 which is fixed to the third blade and holds the thread for the first stitch when the sewing is started in the lower part of an object to be sewed in cooperation with the first blade between the initial position and the position after movement by a fixed distance.

Description

The thread cutting device of Sewing machines

Technical field

The present invention relates to a kind of thread cutting device of Sewing machines.

Background technology

Traditional Sewing machines is to drive and the eedle of knee-action and the interoperation of rotating shuttle by being sewed machine, make stitch making on the thing to form, when beginning to make, generally be at first to pass the leading section that is set at the eedle on the needle bar that can carry out knee-action under the driving of Sewing machines, form the 1st stitch that eedle is made on the thing by eedle being dropped to make reaching the standard grade.Then, make eedle rise, carry and make thing, eedle is descended and form the 2nd and make stitch, by to eedle and with the driving of the rotating shuttle of eedle interlock, make this eedle carry out perseveration up and down, thereby form successive stitches.

But traditional Sewing machines is before beginning to make, and the front end of reaching the standard grade that is through on the eedle through wires hole is a free end.So, rise from cloth at eedle, when reaching the standard grade by cloth, owing to and cloth between friction form impedance, increased the tension force of reaching the standard grade, so the tension force of reaching the standard grade is increased because of the different condition of the thickness of cloth or woven design density etc.And because this tension force suddenly disappears when the front end of reaching the standard grade is pulled out in cloth, reaching the standard grade forms bounce-back and is pulled to eedle through wires hole direction.Therefore, under the short situation of the length of reaching the standard grade from the eedle through wires hole to the line front end (hereinafter referred to as surplus line), reach the standard grade and in the eedle through wires hole, to come off out.In addition, if increase the length of surplus line for anti-coming off of principal vertical line, then will residual long surplus line at the back side of cloth.

In this case, when occurring reaching the standard grade from situation that eedle comes off, need to be through on the eedle reaching the standard grade once more to make again, and form at the cloth back side under the situation of long surplus line, then must cut off long surplus line by manual operations after making, which kind of situation has all caused the decline of operating efficiency.

And, owing to be to be to make since the 1st pin under the free-ended state at the front end of reaching the standard grade that is through on the eedle, so reaching the standard grade when making beginning can not constitute tension force, only can be after having made several pins to the formation tension force of reaching the standard grade.Thereby the stitch of making that has caused making beginning relaxes the inaesthetic problem of shape.

Summary of the invention

The objective of the invention is to solve the above problems, a kind of thread cutting device of Sewing machines is provided, this thread cutting device can prevent from making beginning suture coming off from the eedle when beginning to make, avoid residual long surplus line on the cloth back side after making simultaneously, and can form the stitch of making attractive in appearance.

In order to solve the above problems, the thread cutting device of the present invention's 1 Sewing machines is characterised in that, comprising:

Dispose the below of the needle plate of making thing 21 that mounting in the above made,

Carry out the 1st cutting knife 3 of the reciprocating action of crosscut eedle 15 lowering positions;

Drive the 1st drive unit (for example, impulse motor 6) that the 1st cutting knife 3 carries out reciprocating action;

And lowering position one side's of described eedle side forms the position of readiness of certain intervals and during in sewing finishing by and the interoperation of described the 1st cutting knife 3 can cut off the 2nd cutting knife 4 that can carry out reciprocating action between the off-position of suture;

Drive the 2nd drive unit (for example, pneumatic cylinder 7) that the 2nd cutting knife carries out reciprocating action;

Form described the 1st cutting knife the moving of the initial position of certain distance and the suture when being used to cut off sewing finishing to described the 2nd cutting knife side in side with lowering position the opposing party of described eedle, from the position that described initial position has moved certain distance, making beginning back by cutting off the 3rd cutting knife 5 of suture with described the 1st cutting knife interoperation;

Be fixed on described the 3rd cutting knife, and described the 1st cutting knife that forms the described initial position of certain distance in the side with lowering position the opposing party of described eedle and cut off suture when being used in sewing finishing is to the mobile position of certain distance of described the 2nd cutting knife side, by with described the 1st cutting knife interoperation, can be clamped in the described thread nipping member (for example, clamp 51) of making the thing below to the suture of the 1st pin of making when beginning; And

Control drives the control device (for example, control part 8) of described each drive unit.

The suture of said here the 1st pin is meant in the break-through of making when beginning and forms the part of surplus line at the part from eedle to front end on the eedle (suture when making beginning) after the sewing finishing of the 1st pin.

According to the present invention 1, control device can make the 1st cutting knife carry out the reciprocating action of crosscut eedle lowering position by the 1st drive unit, by the 2nd drive unit make the 2nd cutting knife and a side's of described eedle lowering position side forms the position of readiness of certain distance and during in sewing finishing by and the interoperation of the 1st cutting knife cut off between the off-position of suture and carry out reciprocating action, make the 3rd cutting knife form described the 1st cutting knife the moving of the initial position of certain distance and the suture when being used to cut off sewing finishing in side to described the 2nd cutting knife side with the opposing party of described eedle lowering position, moved from described initial position on the position of certain distance, cut off the suture after the sewing finishing, described make thing below and in described initial position and described position of having moved certain distance the 1st cutting knife and thread nipping member are clamped to make the suture of the 1st pin when beginning.

That is, the suture in the time of not only can cutting off sewing finishing, but also can clamp the suture of the 1st pin when making beginning in described initial position and described position of having moved certain distance and make the beginning back its cut-out.

Therefore, owing to the suture of the 1st pin of making when beginning can have been avoided coming off from the eedle by clamping positively, make and making making under the state that suture is constituted certain tension force, to make on the thing in the process and forming stitch of when beginning, and after making beginning, be cut to and have suitable length, so it is residual can not form the surplus line of undue length after making.That is, can improve the intensity of making of making when beginning, and can form have a good appearance all make stitch.

The present invention's 2 is based on the thread cutting device of the present invention's 1 Sewing machines, for example Fig. 3, Figure 11 and shown in Figure 12, it is characterized in that: described control device (control part 8) can cut off by the suture of the 1st pin of described thread nipping member clamping by driving the 1st drive unit of described the 1st cutting knife when the later any pin of the 2nd pin of making when beginning is counted.

According to the present invention 2, because when the later any pin of the 2nd pin after making beginning is counted, described control device can be by driving the suture that described the 1st cutting knife cuts off the 1st pin of living by the interoperation clamping of itself and described thread nipping member, so can making when carrying out making under the state that suture is constituted certain tension force from the 2nd pin to described any pin number, can improve and make the stitch aesthetic property from described the 2nd pin to any pin number, that is, can obtain that attractive in appearance passing through make that making of when beginning form make beginning the time stitch.

Thereby, can from start to finish make making on the thing and form the state that the suture of making stitch keeps having certain tension force, can form have a good aesthetic property all make stitch.

In addition and since from the 2nd pin when any pin is counted, can under the state that suture is constituted certain tension force, make, make stitch intensity so can improve when making beginning.

The present invention's 3 is based on the thread cutting device of the present invention's 1 or 2 Sewing machines, it is characterized in that: the Sewing machines that can swing relatively by the above eedle of direction that possesses the balancing point device that makes eedle swing at least and carry a kind of device in the described cloth-feeding device of making thing to be formed in the reciprocating action of described each cutting knife

When the eedle of the 1st pin when the eedle of the 1st pin of making when beginning falls near described the 2nd cutting knife side and when making beginning falls near described the 3rd cutting knife side, described control device is by driving described the 1st cutting knife, with described the 2nd cutting knife near side the 1st pin of making when beginning the eedle lowering position and near described the 3rd cutting knife side make beginning the time the eedle lowering position of the 1st pin respectively at a distance of on equidistant position, the suture of the 1st pin when making described thread nipping member clamp each to make beginning.

According to the present invention 3, because when the eedle of the 1st pin when the eedle of the 1st pin of making when beginning falls near described the 2nd cutting knife side and when making beginning falls near described the 3rd cutting knife side, described control device is by driving described the 1st cutting knife, with described the 2nd cutting knife near side the 1st pin of making when beginning the eedle lowering position and near described the 3rd cutting knife side make beginning the time the eedle lowering position of the 1st pin respectively at a distance of on equidistant position, make described thread nipping member clamp the suture that each makes the 1st pin when beginning, so, can to be formed near described the 2nd cutting knife near the side side and described the 3rd cutting knife make beginning the time the stitch of making make with identical tension force, and, since can be formed near described the 2nd cutting knife near the side side and described the 3rd cutting knife make beginning the time suture be cut to identical length, so the shape can make each that comprise surplus line that the suture when making beginning by cut-out forms make beginning the time is identical.

The thread cutting device of the present invention's 4 Sewing machines is, Figure 20 and shown in Figure 21 for example is characterized in that: have and be configured the needle plate of making thing 21 belows that mounting in the above made,

Carry out the 1st cutting knife 3 of the reciprocating action of crosscut eedle lowering position;

And lowering position one side's of described eedle side forms the position of readiness of certain intervals and during in sewing finishing by and the interoperation of described the 1st cutting knife cut off the 2nd cutting knife 4 that carries out reciprocating action between the off-position of suture;

And lowering position the opposing party's of described eedle the side initial position that forms certain distance with making beginning afterwards by and the interoperation of described the 1st cutting knife cut off the 3rd cutting knife 5 that carries out reciprocating action between the off-position of suture;

Drive the 3rd drive unit (for example, impulse motor 9) that the 3rd cutting knife carries out reciprocating action;

Be fixed on described the 3rd cutting knife and be clamped in the described thread nipping member (for example, clamp 51) of making the thing below by suture with the 1st pin of described the 1st cutting knife interoperation when making beginning; And

Control drives the control device (for example, control device 8A) of described each drive unit.

According to the present invention 4, below needle plate by drive described the 3rd drive unit and the 1st drive unit by described control device, described the 1st cutting knife and the thread nipping member that is fixed on described the 3rd cutting knife are moved, the described suture of making the 1st pin in when beginning is clamped in described below of making thing, and after making beginning, cut off the described suture of making when beginning (surplus line), and, by driving the suture after described the 1st drive unit and the 2nd drive unit can make described the 1st cutting knife and the 2nd cutting knife cut-out sewing finishing.

Thereby, when making beginning, can clamp suture earlier and begin again to make, and, can make the surplus line that when making beginning, forms keep suitable length then by cutting off.Like this, can avoid to described suture coming off from the eedle when making thing and beginning to make, simultaneously can residual long surplus line at the back side of cloth, form the stitch made from good appearance.

The present invention's 5 is based on the thread cutting device of the present invention's 4 Sewing machines, it is characterized in that: described control device can be when the later any pin of the 2nd pin of making when beginning be counted by at least one side's who drives described the 1st cutting knife and the 3rd cutting knife drive unit, cut off by the suture of the 1st pin of described thread nipping member clamping.

According to the present invention 5, because when the later any pin of 2nd pin of described control device after making beginning is counted, drive unit by at least one side in described the 1st cutting knife and the 3rd cutting knife, can cut off by with the suture of the 1st pin of the interoperation clamping of described thread nipping member, so making and under the state that suture is constituted certain tension force, to carry out for the time from the 2nd pin to formed the making of described any pin number, thereby can improve the aesthetic property of making stitch from described the 2nd pin to any pin number, that is, can obtain that attractive in appearance passing through make that making of when beginning form make beginning the time make stitch.

The present invention's 6 is based on the thread cutting device of the present invention's 4 or 5 Sewing machines, it is characterized in that: the lowering position of the described eedle of the 1st pin when described control device can be made beginning relatively changes the clip position of making the suture of the 1st pin when beginning by the clamping of the interoperation of described the 1st cutting knife and described thread nipping member.

According to the present invention 6, because the clip position of the suture of the 1st pin the when change of the lowering position of the described eedle of the 1st pin when control device can be made beginning is relatively made beginning by the clamping of the interoperation of described the 1st cutting knife and described thread nipping member is so can freely set the clip position of the suture of described the 1st pin.

Thereby, the clamping of the suture in the time of can forming relatively-stationary suitable location at eedle lowering position and make beginning with the 1st pin of making when beginning.

The present invention's 7 is based on the thread cutting device of the present invention's 4 or 6 described Sewing machiness, it is characterized in that: the Sewing machines that can swing relatively by the above eedle of direction that possesses the balancing point device that makes the swing of described eedle at least and carry a kind of device in the described cloth-feeding device of making thing to be formed in the reciprocating action of described each cutting knife

When the eedle of the 1st pin when the described eedle of the 1st pin of making when beginning falls near described the 2nd cutting knife side and when making beginning falls near described the 3rd cutting knife side, described control device is by driving described the 1st cutting knife and the 3rd cutting knife simultaneously, with described the 2nd cutting knife near side the 1st pin of making when beginning eedle lowering position and near side described the 3rd cutting knife make beginning the time the middle position of eedle lowering position of the 1st pin or the eedle lowering position of the 1st pin when making beginning with described two respectively on the position of equidistance, make described thread nipping member clamp the suture that each makes the 1st pin when beginning.

According to the present invention 7, because when the eedle of the 1st pin when the described eedle of the 1st pin of making when beginning falls near described the 2nd cutting knife side and when making beginning falls near described the 3rd cutting knife side, since described control device with described the 2nd cutting knife near side the 1st pin of making when beginning eedle lowering position and near side described the 3rd cutting knife make beginning the time the middle position of eedle lowering position of the 1st pin or the eedle lowering position of the 1st pin when making beginning respectively apart on the position of equidistance with described two, make described thread nipping member clamp the suture that each makes the 1st pin when beginning, so, can to be formed near described the 2nd cutting knife near the side side and described the 3rd cutting knife make beginning the time the stitch of making make with identical tension force, and, since can be formed near described the 2nd cutting knife near the side side and described the 3rd cutting knife make beginning the time suture be cut to identical length, so the shape can make each that comprise surplus line that the suture when making beginning by cut-out forms make beginning the time is identical.

The present invention's 8 is based on the thread cutting device of the present invention's 1 or 4 Sewing machines, it is characterized in that: in described control device, be provided with at least setting from make begin to the interoperation by described the 1st cutting knife and described the 3rd cutting knife cut off interoperation clamping by described the 1st cutting knife and described thread nipping member make beginning the time the suture of the 1st pin the time the pin number setting device and select a side of the selecting arrangement of this pin number.

According to the present invention 8, because the device by at least one side in described setting device and the described selecting arrangement can determine when making beginning to cutting off the pin number that is clamped in the suture of the 1st pin on the described thread nipping member by the interoperation with described the 1st cutting knife, so can set the time (for example, behind the 2nd pin, behind the 3rd pin etc.) of the suture that cuts off described the 1st pin.

That is, when on making thing, making the formation of stitch, can cut off suture when making beginning in time arbitrarily.

The present invention's 9 is based on the thread cutting device of the present invention's 1 or 4 Sewing machines, it is characterized in that: the off-position of the suture of described control device when the eedle lowering position during sewing finishing changes the cut-out sewing finishing of the interoperation by described the 1st cutting knife and the 2nd cutting knife relatively.

According to the present invention 9, because the off-position of the suture of described control device when the eedle lowering position during sewing finishing changes the cut-out sewing finishing of the interoperation by described the 1st cutting knife and the 2nd cutting knife relatively, so the suture after the position cut-out sewing finishing of eedle lowering position that can be when corresponding sewing finishing.

That is, can after cutting off described sewing finishing, form surplus line with suitable length.

The present invention's 10 is based on the thread cutting device of the present invention's 1,4 or 9 Sewing machines, it is characterized in that: the Sewing machines that can swing relatively by the above eedle of direction that possesses the balancing point device that makes eedle swing at least and carry a kind of device in the described cloth-feeding device of making thing to be formed in the reciprocating action of described each cutting knife

When the eedle during when the described eedle when sewing finishing falls near described the 2nd cutting knife side and in sewing finishing falls near described the 3rd cutting knife side, described control device is by driving described the 1st cutting knife and the 2nd cutting knife simultaneously, with described the 2nd cutting knife near during the sewing finishing of side the eedle lowering position and near described the 3rd cutting knife the middle position of the eedle lowering position the during sewing finishing of side or the eedle lowering position during with described two sewing finishing respectively on the position of equidistance, the suture when cutting off each sewing finishing.

According to the present invention 10, because when the eedle during when described eedle when sewing finishing falls near described the 2nd cutting knife side and in sewing finishing falls near described the 3rd cutting knife side, since described control device with described the 2nd cutting knife near the middle position of eedle lowering position during the sewing finishing of eedle lowering position and near side described the 3rd cutting knife during the sewing finishing of side or the eedle lowering position during with described two sewing finishing respectively apart on the position of equidistance, suture when cutting off each sewing finishing, so, can be cut to identical length by near the suture when being formed on described the 2nd cutting knife near the sewing finishing of the side side and described the 3rd cutting knife, and can make the equal in length of the surplus line that the suture when cutting off sewing finishing forms.

Description of drawings

Fig. 1 is the stereogram of the Sewing machines of the expression Sewing machines thread cutting device that is equipped with the embodiment of the invention 1.

Fig. 2 is the stereogram of Sewing machines thread cutting device main-body structure of thread cutting device of the Sewing machines of presentation graphs 1.

Fig. 3 is the block diagram of control system of the Sewing machines thread cutting device of presentation graphs 1.

Fig. 4 is the stereogram that the thread cutting device main body of Fig. 2 Sewing machines behind the needle plate is unloaded in expression.

Fig. 5 is the vertical view of the 1st～the 3rd cutting knife concise and to the point formation partly of expression Sewing machines thread cutting device main body.

Fig. 6 is the partial side view of the concise and to the point formation of expression each cutting knife part shown in Figure 5.

Fig. 7 is that expression is implemented the vertical view that buckle in 4 holes of a routine clasp of Wrapped foot nail button.

Fig. 8 is illustrated in the flow chart that the example that thread cutting device carried out when carrying out Wrapped foot nail button is handled.

Fig. 9 is the partial perspective view of the thread cutting device main body of the expression state that clamps the suture when beginning to stitch button.

Figure 10 is the major part side view of the state of each cutting knife that clamps suture in the presentation graphs 9.

Figure 11 is the partial perspective view of thread cutting device main body of the state of the expression tangent line that carried out beginning stitching button.

The partial side view of the state of the suture of Figure 12 when to be the cut-out of expression among Figure 11 make beginning.

The partial perspective view of the thread cutting device main body of the thread cutting action when Figure 13 is the expression sewing finishing.

The partial perspective view of the thread cutting device main body of the thread cutting action when Figure 14 is the expression sewing finishing.

The partial side view of the suture state of Figure 15 when to be the cut-out of expression among Figure 14 finish to make.

The partial perspective view of the thread cutting device main body of the thread cutting action when Figure 16 is the expression sewing finishing.

Figure 17 be expression clamp clasp left side make beginning the time the partial perspective view of thread cutting device main body of state of suture.

Figure 18 be expression to clasp left side making beginning the time carry out the partial perspective view of thread cutting device main body of the state of tangent line.

Figure 19 is the partial perspective view of the thread cutting device main body of the thread cutting action of expression when finishing the sewing finishing in clasp left side.

Figure 20 is the partial perspective view of thread cutting device main body that expression has been equipped with the thread cutting device of embodiment 2.

Figure 21 is the block diagram of control system of the thread cutting device of expression embodiment 2.

Among the figure: the 1-Wrapped foot nail button sewing machine, 2,2A-thread cutting device main body, 3-the 1st cutting knife, 4-the 2nd cutting knife, 5-the 3rd cutting knife, 6-impulse motor (the 1st drive unit), 7-Pneumatic cylinder device (the 2nd drive unit), 8,8A-control part (control device), 9-impulse motor (the 3rd drive unit), 200, the 200A-thread cutting device.

The specific embodiment

Below, in conjunction with the accompanying drawings, embodiments of the invention are described in detail.

[embodiment 1]

In addition, though the thread cutting device of Sewing machines of the present invention can be assemblied on any Sewing machines, present embodiment is to describe at thread cutting device of the present invention being arranged on the example that monocycle makes in the formula Wrapped foot nail button sewing machine.

The monocycle of present embodiment shown in Figure 1 is made formula Wrapped foot nail button sewing machine machine 1, has by the support portion 11 of configuration Sewing machines thread cutting device main body 2, stands upright on vertical body 12 on these support portion 11 base end parts, is roughly parallel to the Sewing machines framework 10 that transverse arm portion 13 that above-mentioned support portion 11 forwards extends constitutes from the top of this vertical body 12.

The place ahead head 13a of above-mentioned transverse arm portion 13 is provided with the needle bar 16 that has eedle 15 in its bottom.

This needle bar 16 in being arranged on above-mentioned transverse arm portion 13 not shown Sewing machines driving shaft and carry out knee-action under the driving of transmission device up and down by the needle bar of this drive shaft.

In addition, though not shown, this Sewing machines framework 10 is provided with the cloth-feeding device with the presser foot device that keeps sewn object in the clamping clasp and cloth feeding mechanism that presser foot device is moved.

In addition, in above-mentioned support portion 11, below above-mentioned needle bar 16 vertical, be provided with not shown rotating shuttle.The knee-action of the action of this rotating shuttle and above-mentioned needle bar 16 is synchronous.And, make formerly the suture loop that forms after the suture loop that forms and this wire loop constitute mutual hook company by carrying out interoperation with eedle 15.When the falling of each eedle, carry out same hook and connect, connect, form the monocycle of the sewn object that kept by not shown cloth-feeding device is made by forming hook repeatedly.And, during the whereabouts of last pin of making at monocycle, form the action of final hook company headquarters by eedle and rotating shuttle.Then, after final pin fell, eedle rose, and the hook that forms suture connects stitch, by thread cutting device suture is cut off at last.

Not shown cloth-feeding device is driven by drive unit described later 19, and form with the knee-action of eedle and be positioned in making on the thing on the needle plate 21 by being pressed in linkedly, and can be to the fore-and-aft direction of looking from operator's side, just the Y direction moves.

Thread cutting device 200 clamped this remnants line sustainably until after eedle thrusts the cloth stipulated number, like this, when making beginning suture is constituted certain force of strain before the remaining line of beginning is made in cut-out.

Fig. 2～thread cutting device 200 shown in Figure 6, the 1st cutting knife 3 with crosscut needle downing position, the 2nd cutting knife 4, be configured in the opposite of the 2nd cutting knife 4, form the 3rd cutting knife 5 that needle downing position is clipped in the middle, impulse motor (the 1st drive unit) 6 as the drive unit that drives the 1st cutting knife 3, pneumatic cylinder (the 2nd drive unit) 7 as the drive unit that drives the 2nd cutting knife 4, has the thread cutting device main body 2 of carrying the gripper shoe 22 hold the 1st～the 3rd cutting knife 3～5 that can be respectively moves freely in the balancing point direction (directions X) of the left and right directions of looking from operator's side, the driving that reaches by drive units such as control impuls motor 6 and pneumatic cylinders 7 comes the control part 8 of drive controlling thread cutting device main body 2.

Needle plate 21 is fixedly installed in the above-mentioned support portion 11, and is configured between eedle 15 and the not shown rotating shuttle.On needle plate 21, form the eedle of on directions X, swinging by the driving of balancing point device 15 and insert logical slotted hole shape pin hole 211.

In the bottom of this needle plate 21, the device that is provided with driving each cutting knife 3～5 leads, and is fixed with the tabular gripper shoe 22 of impulse motor 6 and Pneumatic cylinder device 7.

As shown in Figure 4, on gripper shoe 22, at a side's of needle downing position side (from the left side side that operator's side is looked) configuration the 2nd cutting knife 4.At the side (from the right side side that operator's side is looked) of opposite side configuration the 3rd cutting knife 5, between the 2nd cutting knife 4 and the 3rd cutting knife 5, dispose the 1st cutting knife 3, and constitute support, and each cutting knife can move on unidirectional directions X each cutting knife.These the 1st～the 3rd cutting knifes 3～5 are configured on the same straight line on the face of overlooking, and are configured in the below of the balancing point track of the eedle 5 that is arranged in the support portion 11.

The 1st cutting knife 3 is set on the leading section 30a of the 1st tabular cutting knife support portion 30 of the long chi that the balancing point direction is extended, and is provided with on the base end part 30b of the 1st cutting knife support portion 30 to the outstanding protrusion tab portion 303 of the decussate direction of the bearing of trend of the 1st cutting knife support portion 30.The slotted hole 30c that on the bearing of trend crossing at right angle direction that is formed on the base end part 30b of protrusion tab portion 303 and the 1st cutting knife support portion 30 with the 1st cutting knife support portion 30, prolongs.

In this slotted hole 30c, embed sliding freely and be arranged on its base end part and be connected swing arm pin 62a on swing arm 62 leading sections on the driving shaft 61 of impulse motor 6.That is, when the driving shaft 61 that makes impulse motor 6 by driving rotated, the leading section of swing arm 62 waved, and it is mobile that the 1st cutting knife support portion 30 is gone up at bearing of trend (directions X) under the guiding of gripper shoe 22.

By moving of the 1st cutting knife support portion 30, make the directions X of the 1st cutting knife 3, promptly freely towards the 3rd cutting knife side and the 2nd cutting knife side shifting at the actual swaying direction of eedle.Like this, make the 1st cutting knife 3 can carry out moving of crosscut eedle 15 needle downing positions.

Above-mentioned the 1st cutting knife 3 comprises having the plate-like body portion 32 that suture imported inboard notch part 31 of its opening towards the 3rd cutting knife 5 sides (right side among Fig. 4), be set on main part 32 bottom surfaces, by the 1st cutting knife 3 is moved to the 3rd cutting knife 5 sides (right direction among Fig. 4), together clamp the clamp portion 33 that is imported into the suture in the described notch part 31 with the clamping plate 51 that are fixed on the 3rd cutting knife 5 belows, and the rear side that is formed on clamp portion 33 moving directions on the main part 32, promptly, by the 1st cutting knife 3 further to the right (the 3rd cutting knife side) move, together cut off the 1st blade 34 of suture with the 3rd cutting knife 5.

The outstanding upward projection 35 of formation forms the 1st blade 34 at the right flank (the 3rd cutting knife side) of this projection 35 and the rising wood of left surface (with the rightabout side of the 3rd cutting knife side) on the left end of notch part 31.

That is, when being formed in the 1st cutting knife 3 and moving to the right side, can cut off suture by interoperation with the 3rd cutting knife 5, when moving to the left side, the structure that together suture is cut off with the 2nd cutting knife 4.

The 2nd cutting knife 4 is positioned at the position (initial position) that the side (being the left side of the 1st cutting knife 3) with needle downing position is separated here, constitute by the long chi shape parts that on the balancing point direction, extend configuration, on leading section 4a, have suture guide to the inboard notch part 41, be formed on being used in these notch part 41 1 side's edge portions and separate the separated time portion 42 of cut suture and be formed on the 2nd blade 43 on all lower edge in the notch part 41.

The 2nd blade 43 makes the circle-shaped edge part of notch part 41 form the state that tilts downwards.

And, the thickness that formation makes this leading section 4a below the leading section 4a of the 2nd cutting knife 4 is towards the front end inclined plane of attenuation gradually, when the 1st cutting knife 3 moves to from left side that operator's side is looked, the 1st blade 34 of the 1st cutting knife 3 be formed on the vertical lower that part on projection 35 left surfaces can easily enter into the leading section 4a of described the 2nd cutting knife 4.Like this, by making the 1st cutting knife 3, make the 1st blade 34 of the 1st cutting knife 3 can be breaking at the suture that notch part 41 captures by interoperation with the 2nd blade 43 to the 2nd cutting knife 4 side shiftings.In addition, the 2nd cutting knife 4 by inserting the shank 71 in the yarn guide channel 221 lead in gripper shoe 22 and fix the connecting plate 72 of this shank 71, is that the pneumatic cylinder connecting rod 7a formation of directions X be connected with the advance and retreat direction at base end part 4b.The driving that this pneumatic cylinder connecting rod 7a is advanced and retreat by pneumatic cylinder 7, the driving by pneumatic cylinder 7 make the 2nd cutting knife 4, and (leftward position of looking from operator's side) moves horizontally to directions X from a side's of position of readiness needle downing position side.That is, the 2nd cutting knife 4 side (left side) from needle downing position under the effect of pneumatic cylinder 7 moves horizontally to the 3rd cutting knife 5 sides (right side of needle downing position).

The 3rd cutting knife 5 is tabular for long chi, is configured in the opposing party's of eedle 15 needle downing positions side, specifically is to be positioned at the position (initial position) relative with the 2nd cutting knife 4 that needle downing position is clipped in the middle.

Leading section 5a is positioned at the position on the leading section 4a opposite of the 2nd cutting knife 4, and forms the opening towards the 2nd cutting knife 4 sides on this leading section 5a, and forms the 3rd blade 52 and form the notch part 53 that above-below direction is communicated with on the inboard part of inner edge.

This notch part 53 constitutes the introduction part that suture is imported the 3rd blade 52, can capture the derivative suture of the inserting hole (suture when making beginning: the part that forms the surplus line when making beginning) from eedle 15 front ends thus internally.

In addition, below the 3rd cutting knife 5 and with the opposite of the 3rd cutting knife 5, clamp 51 is set with forming certain distance, between the 3rd cutting knife 5 and clamp 51, can insert the main part 32 of the 1st cutting knife 3.At this moment, the interval between the leading section of the 3rd cutting knife 5 and clamp 51 is slightly less than the thickness of the 1st cutting knife 3 main parts 32 at above-below direction, be formed in make the 1st cutting knife 3 main parts 32 below, when promptly clamp portion 33 inserts between the two, be in contact with one another with clamp 51.Thus, constitute the 1st cutting knife 3, catch, and it directly is inserted between the 3rd cutting knife 5 and the clamp 51 with constant state at the cut suture in notch part 31 places of main part 32 in the process of the 3rd cutting knife 5 side shiftings.After being inserted between the 3rd cutting knife 5 and the clamp 51, the clamp portion 33 that is formed on main part 32 bottom surfaces slides on clamp 51, with clamp 51 suture that captures at notch part 31 is remained under the state that is held.

When further making main part 32 to the 3rd cutting knife 5 side shiftings from this state, the suture that is caught in is imported in the notch part 53 of the 3rd cutting knife 5 and is captured once more, and the suture that is caught in this notch part 53 is directed to the 3rd blade 52.Then, the suture that is directed to the 3rd blade 52 cuts off suture by the 1st blade 34 above the projection 35 that is set at main part 32 and the interoperation of the 3rd blade 52.Suture cuts off lasting always maintained state from being clamped to by the 3rd blade 52 of the 1st blade 34 of the 1st cutting knife and the 3rd cutting knife 5 with clamp 51 by clamp portion 33.

The 3rd cutting knife 5 and clamp 51 are fixed on the 1st cutting knife support portion 30 and coexist on the straight line, and are configured on the rectangular tabular clamp platform 55 of the face of overlooking of leading section 30a side of the 1st cutting knife support portion 30.

Clamp platform 55 can be constituted binding by web 56 on the leading section 30a that is erected at the 1st cutting knife support portion 30 and the 1st cutting knife support portion 30 to being configured on the gripper shoe 22 with the 1st cutting knife support portion 30 same directions with moving freely.

On the central portion of clamp platform 55, be formed on the moving direction of the 1st cutting knife support portion 30, i.e. the slotted hole 551 that extends of directions X, the following outstanding chimeric pin 561 that faces down of chimeric leading section 56a from web 56 in this slotted hole 551.

Promptly, formation moves to the rightmost side of looking from operator's side by the leading section 56a that moves the web 56 that carries out driven action with the 1st cutting knife support portion 30, make the chimeric pin 561 of web 56 touch the right side ora terminalis 551a of slotted hole 551, and further move to the right side of looking from operator's side, clamp platform 55 is moved to the right side of looking from operator's side.Thereupon, the 3rd cutting knife 5 and clamp 51 are also moved to the right.

In addition, when the 1st cutting knife support portion 30 when the left side of looking from operator's side is mobile, clamp platform 55 moves in slotted hole 551 but does not touch under the situation of left side ora terminalis 51b at the chimeric pin 561 of web 56 and is not moved, and when touching left side ora terminalis 551b, and it is further under the situation about moving to the left side of looking, driven to the left from operator's side.Thereby also make the 3rd cutting knife 5 and clamp 51 carry out driven.

In addition, be provided with at interval on the clamp platform 55 with the claw 231/232 that is arranged on the hook 23 on the gripper shoe 22 constitute chimeric 2 by fitting portion 552/553.

The hook main part 233 that hook 23 is comprised has in the side of clamp platform 55 and is parallel to arm 233a, the 233b that extends about moving direction (X) direction of clamp platform 55, is respectively equipped with claw 231/232 on the leading section of arm 233a, the 233b of this hook main part 233.

The supporting pin 25 of hook main part 233 by central authorities is rotated and is connected freely on the gripper shoe 22, form under the chimeric situation at the claw 231 in left side and by fitting portion 552, restriction clamp platform 55 moves to the left side of looking from operator's side, the claw 232 on right side with formed under the chimeric situation by fitting portion 553, restriction clamp platform 55 moves to the right side of looking from operator's side.At this moment, the claw of a side with formed under the chimeric state by fitting portion, the claw of opposite side is positioned at the position, side of clamp platform 55, and can be to an a side opposite side shifting chimeric with the formation of clamp platform.

And latch hook 23 leans claw 231,232 in clamp platform 55 1 sides by the elasticity part 26 of helical spring etc.

And the thread cutting device 200 of Sewing machines has the control part 8 of the thread cutting action of each cutting knife 3～5 of control.In addition, this control part 8 is gone back the control device for sewing-machine of dual-purpose for the driving of control cloth-feeding device and balancing point device etc. in the drive controlling of carrying out thread cutting device 200, and making of Sewing machines of team controlled.

Control part 8 shown in Figure 3 has CPU (Central Processing Unit) 81, ROM (Read Only memory) 82, RAM (Random Access Memory) 83, each

drive circuit

84,85,86,87,88 and starts pedal 89, guidance panel 90, by system bus various piece is constituted and can carry out the connection that data transmit mutually.

CPU81 carries out the processing of all control of control part and various data according to being stored in control program among the ROM82 and control data and the signal by starting pedal 89 and guidance panel 90 inputs etc.RAM83 is the memory storage that is used to the working region etc. as CPU81, is used for temporarily preserving the stored contents of ROM82 or the operation result of CPU81.

Drive circuit 84 is connected to motor of sewing machine 17, controls the driving of motor of sewing machine 17 according to the operation result of CPU81.In addition, under the driving of motor of sewing machine 17, make eedle 15 carry out knee-action, make not shown rotating shuttle rotation, thereby on sewn object, make.

Drive circuit 85 is connected to the impulse motor (the 1st drive unit) 6 of thread cutting device main body 2, according to the operation result drive controlling impulse motor 6 of CPU81.Promptly, make swing arm 62 swings by driving pulse motor 6, slided along with the moving of the 1st cutting knife support portion 30 in the 1st cutting knife support portion 30, the 1st cutting knife 3 is moved, and the 3rd cutting knife 5 and clamp 51 are moved by the 1st cutting knife support portion 30, web 56 and clamp platform 55.

Realize control by controlling moving of the 1st cutting knife 3 and clamp platform 55 in this wise to the off-position of the clip position of line and line.Specifically, driving by paired pulses motor 6, can realize the suture maintenance to the 1st pin of thread cutting device main body 2, the control that the suture behind the 1st pin cut off, promptly made the cut-out of the surplus line when beginning, and by the 1st cutting knife 3 is moved, itself and the 2nd cutting knife 4 are together moved, and the suture when finishing to make cuts off.

Drive circuit 86 is connected to the pneumatic cylinder (the 2nd drive unit) 7 of thread cutting device main body 2, according to the operation result of CPU81 pneumatic cylinder 7 is carried out drive controlling, the action that the pneumatic cylinder connecting rod 7a of this pneumatic cylinder 7 is advanced and retreat.Like this, the 2nd cutting knife 4 that is connected pneumatic cylinder connecting rod 7a is moved freely on directions X, move by together move the cut-out that can realize line with the 1st cutting knife 3.

Drive circuit 87 is connected to and drives the drive unit 18 that is set at the not shown balancing point device on the Sewing machines framework 10, controls the balancing point action of balancing point device according to the operation result of CPU81.In addition, control the balancing point action of this balancing point device, make eedle 15 each arrival carry out balancing point when making the thing top position.

Drive circuit 88 is connected to and drives the drive unit 19 be set at the not shown cloth-feeding device on the Sewing machines framework 10, according to the operation result of CPU81 cloth-feeding device is carried out drive controlling.Driving by 19 pairs of cloth-feeding devices of drive unit is synchronously carried out with the driving of the needle bar of the knee-action of being controlled by CPU81.

Start pedal 89 and be used for the control of makers-up Sewing machines, have pedal and the action of this pedal converted to the signal of telecommunication and output to the sensor of CPU81, by the trample operation of makers-up to pedal, variously make instruction to what control Sewing machines rotation stopped to wait and output to CPU81, thereby to motor of sewing machine 17.That is, the makers-up starts Sewing machines by depressing pedal.

Guidance panel 90 outputs to CPU81 to operation signal when button etc. is pressed.And can import information about making by this guidance panel 90, CPU81 carries out calculation process according to this information.By this guidance panel 90, the pin number of making after the beginning that can carry out when cutting off by the suture of the 1st pin of the clamp portion 33 of thread cutting device main body 2 and clamp 51 clampings is set, and can output to CPU81 to the content of setting.Thus, can easily set the time that the suture made after the beginning cuts off as requested.In addition, also can be in guidance panel 90, preestablish that a lot of is selectable makes pin number after the beginning when the suture of the 1st pin that cut-out is held, by therefrom selecting, set.

By selectable a plurality of setting value is set like this, the makers-up can select in a plurality of pin numbers that set in advance.

And, by this guidance panel 90, can also carry out the action indicative of settings (for example sewing speed, the setting of variously making figure, making the various stitch datas etc. of the pin number of figure and sewing condition etc.) of Sewing machines and drive the setting that the action indication (for example balancing point amplitude) of the drive unit 18 of balancing point device waits, and can output to CPU81 to the content of setting.

An example as guidance panel 90, for example can be formed on the guidance panel 90 selection key is set, by pressing this selection key, can set the shape of making of the clasp that is sewn on the sewn object, making pin number after the beginning certainly in the time of maybe can being set in the suture that cuts off the 1st pin that is held.And also can show the pin number, change this numerical value, utilize the numerical value that shows to carry out the pin number and set by pressing options button with 7 n segment display ns.

When the pin when the cut-out imported by guidance panel 90 after beginning made in word was counted, CPU81 was according to reading the tangent line program from the operation signal of guidance panel 90 inputs from ROM82.According to this tangent line program motor of sewing machine 17, impulse motor 6 pneumatic cylinders 7 and drive

unit

18,19 are controlled.Thereby, can when the selecteed pin after making beginning of arrival is counted, cut off suture.

Below, in conjunction with Fig. 7～Figure 19 the action of above-mentioned thread cutting device 200 is described.Here, mainly to describing carrying out no cross spider four holes button shown in Figure 7 processing when making by Wrapped foot nail button sewing machine with thread cutting device 200.

The order that four holes button shown in Figure 7 is made is, at first, eedle is positioned on the button hole position of right upper portion, make needle bar 16 carry out the pin action that falls of knee-action by driving Sewing machines, be needled into the 1st, when extracting then, the driving by cloth-feeding device makes makes thing and moves to the Y direction, make eedle 15 drop to the bottom right button hole then, carry out such action repeatedly.Then after the sewing finishing of the button hole of right side row, eedle 15 is put the button hole position in left side by the balancing point device, similarly under the driving of needle bar and cloth-feeding device, drop in lower-left, the upper left button hole with the number of times of regulation by making eedle 15, carry out making of left column button hole.

In addition, in the explanation of the flow chart of Fig. 8, make, make calling left button hole by making of eedle 15 being dropped to carried out in the button hole about the left side calling right button hole by making of making that eedle 15 drops to that the right side carried out in the button hole up and down.

Thread cutting device 200 in the Sewing machines of making in this wise is by beginning making of each row of the left and right sides and action during sewing finishing, carries out the suture clamping when the 1st pin and line cuts off and the suture during in sewing finishing cuts off.

At first, when connecting the Sewing machines power supply, (in flow chart, represent) with " when inserting power supply ", promptly, when liking to make beginning, thread cutting device 200 at first makes each cutting knife 3～5 of thread cutting device main body 2 form the state (holding state) that is positioned at origin position as shown in Figure 4 according to the origin position release command of control part 8.

At this moment, as the concrete processing example of an example of thread cutting device 200, for example, as the processing of former point retrieval No.1 shown in Figure 8 represented, when needle bar stopped at the summit, impulse motor 6 was retrieved the action of origin position, by returning pneumatic cylinder 7, carry out the origin position retrieval.In the processing of origin position retrieval No.2, make impulse motor 6 rotations make thread nipping member (specifically being the following and clamp of the 1st cutting knife 3) move to assigned position for 25.5 ° then.Then, in the processing of former point retrieval No.3, turn back to origin position for-25.5 ° by making impulse motor 6 rotations.The clamp on＜button right side 〉

Then, Sewing machines drops to eedle in the upper right button hole of four holes button, promptly, carried out the 1st pin that the clasp on right side makes when making at eedle, make impulse motor 6 rotation predetermined angulars (in the processing of the right button hole No.1 of Fig. 8, being 20 ° for example), make the 1st cutting knife 3 to the direction of arrow by swing arm 62, that is, and to the 3rd cutting knife 5 side shiftings (with reference to Fig. 9).So as shown in figure 10, the 1st cutting knife main part 32 is inserted into when notch part 31 carries out capture line between the 3rd cutting knife 5 and the clamp 51, constitute by the following clamp portion 33 and the clamp position to line of clamp 51.In addition, when this gripping action, pneumatic cylinder connecting rod 7a is the state that is pulled, and promptly is positioned at the leftmost side of looking from operator's side.In addition, in Fig. 9, be illustrated in the Sewing machines thread cutting device main body of pulling down under needle plate and gripper shoe 22 states.＜to the cut-out of the suture of making when beginning on clasp right side 〉

Thread cutting device 200 clamps under the state of line at the clamp portion 33 and the clamp 51 that are arranged on the 1st cutting knife 3 bottom surfaces, after having made 2～3 pins, by further making the angle of impulse motor 6 rotation regulations, make the 1st cutting knife 3 further to the 3rd cutting knife 5 side shiftings (with reference to Figure 11) by swing arm the 62, the 1st cutting knife support portion 300.So, the 1st cutting knife main part 32 further inserts between the 3rd cutting knife and the clamp 51, and catch sutures at the notch part 53 of the 3rd cutting knife 5, and by making the 1st blade 34 that is arranged on the 1st cutting knife main part 32 tops to above-mentioned the 3rd cutting knife 5 side shiftings, with the interoperation of the 3rd cutting knife under suture is cut off.(with reference to Figure 12).

For example, processing shown in Figure 8 is the processing of the No.2 of right button hole, when being 270 ° of the 4th pin in the needle bar position, by making impulse motor 6 rotations 5.5, the 1st cutting knife 3 and the 3rd cutting knife 5 is cut off suture.Thereby the long line for the unnecessary length that forms when making beginning is cut to suitable length.＜to the cut-out of the suture after the sewing finishing on clasp right side 〉

As shown in figure 13, after sewing finishing, make pneumatic cylinder connecting rod 7a outstanding, make the 2nd cutting knife 4, make impulse motor 6 rotations simultaneously, the 1st cutting knife 3 is moved to the left side of looking from operator's side to the 3rd cutting knife 5 side shiftings by driving pneumatic cylinder 7.Like this, when driving above-mentioned pneumatic cylinder 7, the 2nd cutting knife 4 moves to the direction of arrow (the 3rd cutting knife side), a side of hooking the suture that is hooked by not shown rotating shuttle by the separated time portion 42 on the leading section 4a that is arranged on the 2nd cutting knife 4.Then, deliver to the 2nd blade 43 of the 2nd cutting knife 4.What for example Fig. 8 was represented is the processing of right button hole No.3, and during position when being positioned at last pin in the needle bar position and finishing, control part 8 makes-39 ° of impulse motor 6 rotations, drives pneumatic cylinder 7 simultaneously and makes pneumatic cylinder connecting rod 7a outstanding.

And, as shown in figure 14,, make the 1st cutting knife 3 be pulled back to the left side of looking from operator's side by the driving of impulse motor 6, form moving to the direction of arrow.

Like this, as shown in figure 15, the 1st cutting knife 3 moves to the 2nd cutting knife 4 sides of catching the suture of a side that needs cut-out at notch part 41, overlapping with the following formation of the 2nd cutting knife 4, the suture that is captured by the 2nd cutting knife 4 is cut off (processing of right button hole No.3 shown in Figure 8) by the 1st blade 34 of projection 35 right flanks of the 2nd blade 43 of the 2nd cutting knife 4 and the 1st cutting knife 3.

Then, as shown in figure 16, the 2nd cutting knife 4 is moved to the direction of arrow (from the left side that the operator looks), turn back to and go back original position, and the 1st cutting knife 3 is also moved to same direction by driving pulse motor 6 by retracting pneumatic cylinder 7.

When the left side of looking from operator's side was mobile, after the 1st cutting knife 3 had moved certain distance, the clamp platform 55 that is attached on the 1st cutting knife 3 by web 56 also moved to equidirectional the 1st cutting knife 3 by swing arm 62.That is, though clamp platform 55 be fixed by hook institute 23, by moving of web 56, the claw 231 of hook lock 23 be disengaged by the chimerism of fitting portion 552, clamp platform 55 can be moved.

Carry out making of clasp left side from this position.The clamp in＜clasp left side 〉

The gripping action in clasp left side and effect are identical with the gripping action on above-mentioned clasp right side, but because in the former action, the leftward position of the position that clamp platform 55 is configured when being located at the gripping action on clasp right side, so be fixed on the left side of the position of the position of the 3rd cutting knife 5 on this clamp platform 55 and clamp 51 when being positioned at the hardships and dangers action on clasp right side, that is, be positioned near the needle downing position of the eedle 15 of balancing point left.Like this, the 1st cutting knife 3 is that benchmark moves with the position of the 3rd cutting knife 5 and clamp 51.

Concrete is, as shown in figure 17, pin being dropped on four holes at Sewing machines buckles in the upper left button hole, when promptly the 1st pin that carries out making in the clasp left side at eedle is made, 6 rotations of driving pulse motor, carrying out the left side of clasp right side when making relatively, make the 1st cutting knife 3 to the direction of arrow, i.e. the 3rd cutting knife 5 side shiftings by swing arm 62 and the 1st cutting knife support portion 30.Thus, identical with making of above-mentioned clasp right side, the 1st cutting knife main part 32 is inserted between the 3rd cutting knife 5 and the clamp 51 when notch part 31 carries out capture line, carries out clamping by following clamp portion 33 with 51 pairs of lines of clamp.In addition, in the process of this gripping action, the state that pneumatic cylinder 7 maintenances are return promptly is positioned at the leftmost side of looking from operator's side.

In conjunction with the concrete flow chart of handling Fig. 8 of example of expression, when control part 8 is 270 ° on the 1st pin in the needle bar position, the rotation that impulse motor 6 beginnings are 19.5 °, make the 1st cutting knife 3 to the 3rd cutting knife 5 side shiftings by swing arm 62 and the 1st cutting knife support portion 30, clamp line by following clamp portion 33 and clamp 51.＜clasp left side make beginning the time tangent line

Thread cutting device 200 is online to be set under the state of clamp portion 33 on the bottom surface of the 1st cutting knife 3 and clamp 51 clampings, after having made 2～3 pins, by further making the angle of impulse motor 6 rotation regulation, make the 1st cutting knife by swing arm 62 and the 1st cutting knife support portion 30 further to the 3rd cutting knife 5 side shiftings (with reference to Figure 18).So, in the 1st cutting knife main part 32 further is inserted between the 3rd cutting knife 5 and the clamp 51, when the notch part 53 of the 3rd cutting knife 5 catches line, by making the 1st blade 34 that is arranged on the 1st cutting knife main part 32 tops, together suture is cut off with the 3rd cutting knife 5 to described the 3rd cutting knife 5 side shiftings.

For example handle in the flow chart of Fig. 8 of example in expression, the processing of the left button hole No.5 that makes as clasp when being 270 ° of the 4th pin in the needle bar position, by making impulse motor 6 rotations 3, being cut off by the 1st cutting knife 3 and the 3rd cutting knife 5 and to be made the suture of beginning.Can form surplus line by cutting off the unnecessary length part of the surplus line that when making beginning, generates like this with suitable length.

Here, after having carried out making the tangent line of beginning,, clamp platform 55 is moved in order to prepare making thereafter.That is, make the state after moving identical with state shown in Figure 9.As for example shown in the processing of the left button hole No.6 of Fig. 8 of this processing, when the needle bar position be the 6th pin 270 the time, control part 8 makes 16.5 ° of impulse motor 6 rotations, by swing arm 62 and the 1st cutting knife support portion 30 web 56 is moved to the right side of looking from operator's side, remove the claw 232 of hook lock 23 and, the 3rd cutting knife 5 and the clamp 51 that are arranged on the clamp platform 55 are moved to the right by the chimerism of fitting portion 553.The tangent line of the sewing finishing in＜clasp left side 〉

This action is identical with the thread cutting action of the sewing finishing on above-mentioned clasp right side, but owing to do not need to make clamp platform 55 to making side shifting, so that the 1st cutting knife 3 moves to the left with less stroke when the thread cutting action of the sewing finishing on clasp right side, carry out tangent line (with reference to Figure 19).

For example, as the processing of the left button hole No.7 of Fig. 8, during position when the needle bar position is positioned at last pin and finishes, control part 8 drives pneumatic cylinder 7 makes pneumatic cylinder connecting rod 7a outstanding, make the 2nd cutting knife 4 to the 3rd cutting knife 5 side shiftings, make-25.5 ° of impulse motor 6 rotations simultaneously, the 1st cutting knife 3 is moved to the left side of looking from operator's side.

Concrete is that after above-mentioned pneumatic cylinder 7 was driven, the 2nd cutting knife 4 moved to the direction of arrow (the 3rd cutting knife side), a side of being hooked the suture that is hooked by not shown rotating shuttle by the separated time portion 42 on the leading section 4a that is arranged on the 2nd cutting knife 4.Deliver to the 2nd blade 43 of the 2nd cutting knife 4 then.Then, by the moving of the 1st cutting knife 3 under the driving of impulse motor 6 to the direction of arrow, as shown in Figure 15, make 2nd cutting knife 4 side shiftings of the 1st cutting knife 3, form following overlapping state with the 2nd cutting knife 4 to the suture that captures a cut side at notch part 41.Like this, the suture that is captured by the 2nd cutting knife 4 is cut off by the 1st blade 34 of projection 35 right flanks of the 2nd blade 43 of the 2nd cutting knife 4 and the 1st cutting knife 3.

By returning pneumatic cylinder connecting rod 7a, the 2nd cutting knife 4 is moved to the left side of looking from operator's side then, turn back to original position.Clamp during＜kinking pin 〉

The processing of kinking pin No.8 as shown in Figure 8 is such, is positioned at 270 o'clock of the 1st pin in the needle bar position, and control part 8 begins to make impulse motor 6 to carry out 20 ° rotation.The control part 8 control pneumatic cylinder connecting rod 7a of this moment are the state of returning.Carry out 20 ° rotation by impulse motor 6, make the distance of the 1st cutting knife 3, form line by the hold mode of clamp portion 33 and clamp 51 clampings to the 3rd cutting knife 4 side shiftings regulation.The tangent line of making beginning during＜kinking pin 〉

The tangent line of making beginning of the thread cutting device 200 when the kinking pin is made is handled and is handled identical with the tangent line of making beginning on above-mentioned clasp right side.Promptly, the processing of kinking pin No.9 as shown in Figure 8 is such, when being positioned at 270 ° of the 4th pin in the needle bar position, control part 8 is by making 5.5 ° of impulse motor 6 rotations, and by the 1st cutting knife 3 is further moved to the 3rd cutting knife volume, make clamp portion 33 slip on clamp 51, the 3rd blade 52 by the 1st blade 34 of the 1st cutting knife 3 and the 3rd cutting knife 5 under the online state that is held cuts off suture.Thereby can make the redundance that when beginning form and make surplus line keep suitable length by being breaking at.Tangent line during sewing finishing that＜kinking pin is made 〉

Thread cutting action identical (with reference to Figure 19) during the sewing finishing on this action and above-mentioned clasp right side, but owing to do not need to make clamp platform 55 to move to the left, so, move to the left by making the 1st cutting knife 3 little stroke with the time than the thread cutting action of the sewing finishing on clasp right side, carry out tangent line.

Concrete is, the processing of kinking pin No.10 as shown in Figure 8 is such, during position when being positioned at last pin in the needle bar position and finishing, control part 8 drives pneumatic cylinder 7 makes pneumatic cylinder connecting rod 7a outstanding, make the 2nd cutting knife 4 to the 3rd cutting knife 5 side shiftings, make-25.5 ° of impulse motor 6 rotations simultaneously, the 1st cutting knife 3 is moved to the left side of looking from operator's side.

Thus, the suture that is captured by the 2nd cutting knife 4 is cut off by the 1st blade 34 of the left surface of the projection 35 of the 2nd blade 43 of the 1st cutting knife 4 and the 1st cutting knife 3.

Like this, just, having finished the Wrapped foot nail button of 1 circulation of 4 holes buttons makes.

Thread cutting device 200 according to the Sewing machines of above-mentioned formation, owing to clamp the suture made when beginning (remaining in the surplus line of making below the thing when making thing thrusting at first) so after the making of the 1st pin with the clamp 51 of the clamp portion 33 of the 1st cutting knife 3 of thread cutting device main body 2 and the 3rd cutting knife 5 sides, when eedle was extracted from make thing, line can not come off.

In addition, owing to can be carried out making of the 2nd, the 3rd pin under the state of clamp portion 33 and clamp 51 maintenances by the suture when making beginning, so can make the suture when making beginning form certain force of strain, can under the state that from start to finish keeps certain tension force, make, can be made into attractive in appearance making finished product and can improve the intensity of making.

And, owing to the suture when beginning is made in the cut-out of the position of regulation by the 1st cutting knife 3 and the 3rd cutting knife 5, so, removed the unnecessary length part of surplus line, and can make surplus line have certain length.

Since constitute a reciprocating action by the 1st cutting knife 3 make tangent line when beginning and sewing finishing respectively toward action and double action the time tangent line, so with traditional different, do not need thread cutting action is each time carried out a reciprocating action, thus time that can be under reach.

In the above embodiments 1, it is the ratchet wheel device that has hook lock 23 by use, formation is driven the action of the clamp platform 55 of fixing the 3rd cutting knife 5 and clamp 51 by the same drive source that is used to drive the 1st cutting knife 3, but be not limited thereto, also can constitute with the 1st cutting knife 3 and use different drive sources respectively.The following describes an example wherein.[embodiment 2]

Below, in conjunction with Figure 20 and Figure 21 the thread cutting device of embodiment 2 is described.

The difference of the thread cutting device of present embodiment 2 and thread cutting device 200 is, the impulse motor 6 that the 3rd cutting knife 5 can't help to drive the drive source of the 1st cutting knife 3 drives, but by independently drive source driving, other formation is identical with thread cutting device 200, and carries out same action.Therefore, only the difference that constitutes is described below, use same-sign and identical title, and omit explanation for same component part.

The thread cutting device 200A of embodiment 2 passes through to drive thread cutting device main body 2A by control part 8A (with reference to Figure 21), the suture in the time of can not only cutting off sewing finishing, and cut off the surplus line of making when beginning with can keeping specific length.And, before the surplus line of thread cutting device main body 2A when beginning is made in cut-out, this surplus line can be remained to eedle and thrust after the stipulated number of cloth.

As Figure 20 and shown in Figure 21, it is (identical with needle plate 21 that the thread cutting device 200A of embodiment 2 and the thread cutting device 200 of embodiment 1 similarly have a needle plate, and omission diagram), the 1st cutting knife 3, the 2nd cutting knife 4, the 3rd cutting knife 5, drive the impulse motor 6 of the 1st cutting knife 3, drive the pneumatic cylinder 7 of the 2nd cutting knife 4, also have as the impulse motor 9 of the 3rd drive unit that drives the 3rd cutting knife 5 in addition etc., and have by the balancing point direction (directions X) to the left and right directions of looking respectively and move thread cutting device main body 2A and the control impuls motor 6 that the 1st～the 3rd cutting knife 3～5 freely constitutes from operator's side, 9 and the control part 8A of the driving of pneumatic cylinder 7.

In the formation of the 1st～the 3rd cutting knife 3～5, different except being driven independently at the 3rd cutting knife 5 and clamp 51 on this point, other configuration relation is respectively with above-mentioned identical.That is, dispose the 2nd cutting knife 4 in a side's of the needle downing position of needle plate side respectively, dispose the 3rd cutting knife 5 on the opposite of described the 2nd cutting knife 4 in the opposing party's of needle downing position side, in addition configuration the 1st cutting knife 3 between the 2nd cutting knife 4 and the 3rd cutting knife 5.

The 3rd cutting knife 5 is fixed on along on the leading section 96a of long chi shape the 3rd cutting knife gripper shoe 96 of the extending direction configuration of the 1st cutting knife support portion 30.The 3rd cutting knife gripper shoe 96 can be moved freely on directions X, on this leading section 96a, except the 3rd cutting knife 5, also be fixed with simultaneously the below that is configured in the 3rd cutting knife 5 with the interval of regulation and the substantially parallel clamp 51 of described the 3rd cutting knife 5.

On the base end part 96b of the 3rd cutting knife gripper shoe 96, be formed with the right angle orientation of the moving direction of the 3rd cutting knife gripper shoe 96 on prolong and the slotted hole 96c that is communicated with at above-below direction.The chimeric pin 97 that is entrenched in this slotted hole 96c moves freely along inner edge portion, and this chimeric pin 97 is set on the leading section 98a of swing arm 98.

The base end part 98b of swing arm 98 is connected on the rotating shaft 9a of impulse motor 9, driving by impulse motor 9 makes rotating shaft 9a rotation, this rotation forms the leading section 98a of swing arm 98 and swings/pass through the swing of this leading section 98a, the chimeric pin 97 that is arranged on this leading section 98a is moved in slotted hole 96c, by this action, it is cofree mobile to make the 3rd cutting knife gripper shoe 96 be formed on directions X.

Control part 8A is on the basis of the control part 8 with CPU81, ROM82, RAM83, each

drive circuit

84,85,86,87,88 and startup pedal 89 and guidance panel 90, also have and be connected with impulse motor 9, be used for this impulse motor 9 being carried out the drive circuit 95 of drive controlling, be formed in by system bus and can carry out the connection that data transmit between the various piece according to the operation result of CPU81.

Control part 8A controls the action of the 1st of thread cutting device main body 2～the 3rd cutting knife 3～5 by impulse motor (the 1st drive unit) 6, pneumatic cylinder (the 2nd drive unit) 7 and the impulse motor (the 3rd drive unit) 9 of drive controlling thread cutting device main body 2.That is,, make swing arm 62 swing, slided in the 1st cutting knife support portion 30, and, be that the 1st cutting knife 3 moves along with the moving of the 1st cutting knife support portion 30 by driving pulse motor 6.

In addition, control part 8A makes the pneumatic cylinder connecting rod 7a action of advancing and retreat by driving pneumatic cylinder 7, make the 2nd cutting knife that is connected with pneumatic cylinder connecting rod 7a on directions X mobile freely, and the thread cutting action when carrying out sewing finishing jointly with the 1st cutting knife 3.

And control part 8A is by driving pulse motor 9, can make the clamp platform 55 that is connected with this impulse motor 9 move to assigned position on the directions X.By moving of this clamp platform 55, can make the 3rd cutting knife 5 and clamp 51 move to the position of regulation, thereby can realize freely setting the clamp position of carrying out with the 1st cutting knife 3 and tangent position.Concrete is, driving by impulse motor 6,9, thread cutting device main body 2 can be carried out the suture maintenance of the 1st pin, the suture behind the 1st pin cuts off, promptly, can be when the surplus line of making when beginning cuts off, driving pulse motor 6 and pneumatic cylinder 7, the tangent line when making the 1st cutting knife 3 and the 2nd cutting knife 4 carry out sewing finishing jointly.

In addition, according to above-mentioned thread cutting device 200A, since make the clamp position in when beginning and tangent position can by control part 8A respectively paired pulses motor 6,9 independently drive to determine, so carry out quantitative rotation by driving pulse motor 9, can carry out the setting of optional position to the position of the 3rd cutting knife 5 and clamp 51, and, by driving pulse motor 6 the 1st cutting knife 3 is moved, can clamp the suture (suture of the 1st pin) of making when beginning in described position arbitrarily or at the suture when the state incision breaking joint system that clamps line begins.

And, tangent line that also can be when sewing finishing is carried out in the position arbitrarily.That is, needle downing position that can corresponding eedle carries out clamp and tangent line at suitable position.

In addition, the above embodiments are explanations that the Sewing machines with balancing point device is carried out as the installation main body, but also can use by drive unit foot device are moved on directions X, make eedle form the device of relative swing.In addition, above-mentioned explanation is at Sewing machines thread cutting device of the present invention is arranged on the explanation of Wrapped foot nail button sewing machine, but also is applicable to any Sewing machines that cuts off the suture of making beginning and sewing finishing.

And, in above embodiment, illustrated that 6 conducts of use impulse motor drive the drive units of the 1st cutting knife 3, use drive units, use impulse motor 9 the situations as the drive unit that drive 3rd cutting knife 5 of pneumatic cylinder 7 as driving the 2nd cutting knife 4, but the invention is not restricted to this, carry out above-mentioned action as long as can drive each cutting knife, for example, also can replace impulse motor and use servo motor etc., or replace pneumatic cylinder and use oil hydraulic cylinder, electromagnetic valve and Direct Action Type line motor etc.

In addition, as long as can make each parts carry out above-mentioned action, also can be shape etc. arbitrarily for shape of the driving conducting parts of each cutting knife 3～5 etc., also can carry out suitable change naturally for other concrete formations etc. in addition.In addition, the thread cutting device of present embodiment is not only applicable to Wrapped foot nail button sewing machine, this Sewing machines also is not limited only to make four holes button, and the thread cutting device of present embodiment is making applicable to clasp with 2 and 2 above button holes and specialshaped button (ShankButton) etc. also.

According to the present invention 1 because the suture not only can cut off sewing finishing the time, and can At the seam that clamps the 1st pin of making when beginning from initial position to the position that moves to certain distance So line, and can cutting off suture after making beginning is by guaranteeing to make when beginning The clamping that the suture of the 1st pin can not come off from eedle, can be when making beginning make the time, Under the state that line is consisted of certain tension force, form stitch making thing, and owing to making The tangent line that only keeps suitable length after the beginning is not so can residual unnecessary length after making Surplus line. That is, both improved the intensity of making of making the beginning and improved also that to make stitch all Aesthetic property.

According to the present invention 2, not only can obtain and the present invention's 1 identical effect, and can Suture is consisted of carry out under the state of tension force when making to any pin is formed since the 2nd pin Make, thereby can improve the stitch of making from described the 2nd pin to any pin number, that is, and by seam The aesthetic property of making stitch of making beginning of making making of beginning and forming.

Thus, can be to from start to finish consisting of certain tension force at the suture of making thing and form stitch, What make the product of finishing that are made of the stitch that forms all has a good aesthetic property. In addition, because When making beginning, just making the process from the 2nd pin to the Arbitrary Digit pin can consist of line Make under the state of some tension, so can improve the intensity of making stitch.

According to the present invention 3, not only can obtain and the present invention's 1 or 2 same effects, and Can also be formed on identical tension force near the 2nd cutting knife side with near the seam of the 3rd cutting knife side When beginning system make making of stitch, and can be formed on approach described the 2nd cutting knife side with Suture when beginning near making of described the 3rd cutting knife side is cut to equal length, so by cutting Suture when breaking joint system begins can make that to comprise each shape of making beginning that forms surplus line identical.

According to the present invention 4, can clamp earlier line and begin again to make making when beginning, and And by after making beginning, suture being cut off, the surplus line that forms when making beginning is kept Suitable length, thus line can not come off from eedle when making thing and begin to make, And on the back side of cloth, can not form the residual of long surplus line, can form and to have good appearance Make stitch.

According to the present invention 5, not only can obtain and the present invention's 4 same effects, and, can Under the state that line is consisted of tension force, carry out when making to any pin is formed since the 2nd pin Make, thereby can improve the stitch of making from described the 2nd pin to any pin number, that is, and by seam The aesthetic property of making stitch of making beginning of making making of beginning and forming can be to making on the thing The suture that forms stitch from start to finish consists of certain tension force, makes by finishing that the stitch that forms consists of Product all have a good aesthetic property. In addition, because from the 2nd pin making to the Arbitrary Digit pin In the journey, can under the state that line is consisted of some tension, make, make stitch so can improve Intensity.

According to the present invention 6, not only can obtain and the present invention's 4 or 5 same effects, and But the clip position of the suture of free setting the 1st pin can be made the falling of the 1st pin in when beginning relatively The pin position clamps the suture of making when beginning in the suitable position that can really fix.

According to the present invention 7, not only can obtain and the present invention's 4 or 6 same effects, and Can also be formed on identical tension force near the 2nd cutting knife side with near the seam of the 3rd cutting knife side When beginning system make making of stitch, and can be formed on approach described the 2nd cutting knife side with Suture when beginning near making of described the 3rd cutting knife side is cut to equal length, so by cutting Suture when breaking joint system begins can make that to comprise each shape of making beginning that forms surplus line identical.

According to the present invention 8, not only can obtain and the present invention's 1 or 4 same effects, and Can set the tangent line time (such as behind the 2nd pin, behind the 3rd pin etc.) of the 1st pin.

According to the present invention 9, not only can obtain and the present invention's 1 or 4 same effects, and Since by control device relatively the needle downing position change of the eedle during sewing finishing by the 1st cutting knife And the off-position of the suture of the 2nd cutting knife when jointly cutting off sewing finishing, so can make in correspondence Suture when the position of the needle downing position during end cuts off sewing finishing can make described after being cut off Surplus line during sewing finishing has suitable length.

According to the present invention 10, not only can obtain and the present invention's 1,4 or 9 same effects, And can be being formed near described the 2nd cutting knife side with near the knot of making of described the 3rd cutting knife side Suture during bundle is cut to equal length, can the suture when cutting off sewing finishing forms to have phase Surplus line with length.

Claims

1. the thread cutting device of a Sewing machines is characterized in that: comprises being configured in the needle plate below,

Carry out the 1st cutting knife of the reciprocating action of crosscut eedle lowering position;

Drive the 1st drive unit that the 1st cutting knife carries out reciprocating action;

And lowering position one side's of described eedle side forms the position of readiness of certain intervals and during in sewing finishing by and the interoperation of described the 1st cutting knife can cut off the 2nd cutting knife that can carry out reciprocating action between the off-position of suture;

Drive the 2nd drive unit that the 2nd cutting knife carries out reciprocating action;

Form described the 1st cutting knife the moving of the initial position of certain distance and the suture when being used to cut off sewing finishing to described the 2nd cutting knife side in side with lowering position the opposing party of described eedle, from the position that described initial position moves a certain distance, making beginning back by cutting off the 3rd cutting knife of suture with described the 1st cutting knife interoperation;

Be fixed on described the 3rd cutting knife, and described the 1st cutting knife that forms the described initial position of certain distance in the side with lowering position the opposing party of described eedle and cut off suture when being used in sewing finishing is to the mobile position of certain distance of described the 2nd cutting knife side, by with described the 1st cutting knife interoperation, can be clamped in the described thread nipping member of making the thing below to the suture of the 1st pin of making when beginning; And

Control drives the control device of described each drive unit.

2. the thread cutting device of Sewing machines according to claim 1, it is characterized in that: described control device can cut off by the suture of the 1st pin of described thread nipping member clamping by driving the 1st drive unit of described the 1st cutting knife when the later any pin of the 2nd pin of making when beginning is counted.

3. the thread cutting device of Sewing machines according to claim 1 and 2, it is characterized in that: the Sewing machines that can swing relatively by the above eedle of direction that possesses the balancing point device that makes eedle swing at least and carry a kind of device in the described cloth-feeding device of making thing to be formed in the reciprocating action of described each cutting knife

4. the thread cutting device of a Sewing machines is characterized in that: has and is configured the needle plate below of making thing that mounting in the above made,

And lowering position one side's of described eedle side forms the position of readiness of certain intervals and during in sewing finishing by and the interoperation of described the 1st cutting knife cut off the 2nd cutting knife that carries out reciprocating action between the off-position of suture;

And lowering position the opposing party's of described eedle the side initial position that forms certain distance with making beginning afterwards by and the interoperation of described the 1st cutting knife cut off the 3rd cutting knife that carries out reciprocating action between the off-position of suture;

Drive the 3rd drive unit that the 3rd cutting knife carries out reciprocating action;

Be fixed on described the 3rd cutting knife and be clamped in the described thread nipping member of making the thing below by suture with the 1st pin of described the 1st cutting knife interoperation when making beginning; And

Control drives the control device of described each drive unit.

5. the thread cutting device of Sewing machines according to claim 4, it is characterized in that: described control device can be when the later any pin of the 2nd pin of making when beginning be counted by at least one side's who drives described the 1st cutting knife and the 3rd cutting knife drive unit, cut off suture by the 1st pin of described thread nipping member clamping.

6. according to the thread cutting device of claim 4 or 5 described Sewing machiness, it is characterized in that: the clip position of the suture of the 1st pin when the lowering position change of the described eedle of the 1st pin when described control device can be made beginning is relatively made beginning by the clamping of the interoperation of described the 1st cutting knife and described thread nipping member.

7. according to the thread cutting device of claim 4 or 6 described Sewing machiness, it is characterized in that: the Sewing machines that can swing relatively by the above eedle of direction that possesses the balancing point device that makes the swing of described eedle at least and carry a kind of device in the described cloth-feeding device of making thing to be formed in the reciprocating action of described each cutting knife

8. according to the thread cutting device of claim 1 or 4 described Sewing machiness, it is characterized in that: in described control device, be provided with at least setting from make begin to the interoperation by described the 1st cutting knife and described the 3rd cutting knife cut off interoperation clamping by described the 1st cutting knife and described thread nipping member make beginning the time the suture of the 1st pin the time the pin number setting device and select a side of the selecting arrangement of this pin number.

9. according to the thread cutting device of claim 1 or 4 described Sewing machiness, it is characterized in that: the off-position of the suture of described control device when the eedle lowering position during sewing finishing changes the cut-out sewing finishing of the interoperation by described the 1st cutting knife and the 2nd cutting knife relatively.

10. according to the thread cutting device of claim 1,4 or 9 described Sewing machiness, it is characterized in that: the Sewing machines that can swing relatively by the above eedle of direction that possesses the balancing point device that makes eedle swing at least and carry a kind of device in the described cloth-feeding device of making thing to be formed in the reciprocating action of described each cutting knife