CN1542196B

CN1542196B - Needle thread feeding device of sewing machine

Info

Publication number: CN1542196B
Application number: CN 200410032362
Authority: CN
Inventors: 岩井胜彦; 井上忠德; 草积要
Original assignee: Yamato Sewing Machine Mfg Co Ltd
Current assignee: Yamato Sewing Machine Mfg Co Ltd
Priority date: 2002-05-01
Filing date: 2003-04-30
Publication date: 2010-09-22
Anticipated expiration: 2023-04-30
Also published as: TW200526837A; CN1690285B; JP2003320190A; TW200403370A; CN1455042A; CN100523349C; TW200419027A; CN1690285A; TWI289163B; TWI283275B; TWI283274B; CN1542196A; JP3834754B2

Abstract

To enable a superior sewing to be carried out without producing any poor sewing or reduction in quality of round-shaped raised portion or the like even in the case that a normal usual cloth is applied as an item to be sawn and a soft and expandable raw material cloth such as a micro-fiber cloth is applied. A movable needle thread feeding member 8 arranged at a sewing machine arm segment 1 so as to be reciprocated and oscillated in a vertical direction under a synchronous operation with a vertical reciprocating motion of a needle rod 3 and a needle 5, to cause a needle thread 9 passed through a specified needle thread path 13 and supplied to be descended and guided toward the needle 5 is provided with a needle thread guiding segment 8a having a third needle thread feeding hole 8C for feeding out and guiding a needle thread segment 9a between a first needle thread feeding hole 8A formed at its extremity end and a second needle thread feeding hole 8B formed at a substantial intermediate portion in a longitudinal direction under a state in which it is bent substantially in a V-shape in a downward direction. (C)2004,JPO .

Description

The Sewing machines of band needlework let-off gear(stand)

The present invention is that application number is 03130778.7, the applying date is dividing an application of April 30, denomination of invention in 2003 the needlework let-off gear(stand) that is Sewing machines.

Technical field

The present invention relates to mainly to be applicable to the Sewing machines of the band needlework let-off gear(stand) of spininess flat lock-stitch machine, specifically relate to have Sewing machines as the band needlework let-off gear(stand) of lower member, promptly, comprising: but logically be supported on driving main shaft interlock in the Sewing machines arm, be supported in the shank of the leading section of Sewing machines arm to the above-below direction reciprocating motion with inserting by crank mechanism; Be installed in the pin of this shank bottom; Comprise looper, grey cloth feed mechanism the member of making at interior, as to be contained in Sewing machines base plate leading section; The yarn changing device that the tension force of the needlework of supplying with pin and looper and looper line is adjusted; And the needlework let-off gear(stand) of deriving along with the pumping of above-mentioned shank, to the needlework of supplying with to pin via yarn changing device and location needlework passage.

Background technology

In the Sewing machines of this traditional band needlework let-off gear(stand), in order to keep good thread tension all the time, derivation control device as needlework, for example shown in the Japanese patent laid-open 7-155488 communique, except the movable needlework that oscillating motion up and down reciprocatingly is set in the front of Sewing machines arm etc. are derived the member, the known scheme that also has a kind of upper end that makes shank to stretch out upward, fixing the needlework passage that pumps synchronously with shank in this shank upper part of stretching out from the upper wall portions of Sewing machines arm leading section.

Yet, in the Sewing machines of above-mentioned traditional band needlework let-off gear(stand), for the needlework passage is fixed, because in upper wall portion, therefore be formed with the upper part that makes shank and stretch out the through hole of usefulness upward, not only can take place to invade possibility in the Sewing machines arm from this through hole leakage of oil and dust from the upper wall portions of Sewing machines arm leading section, and, because of the needlework passage that stretches out upward carries out high-speed pumping, be disadvantageous from security aspect for operator etc.In addition, because the length of shank lengthening, and because of the increase of the shank weight that fixedly causes of needlework passage, nature can bring obstruction to the high speed of sewing speed.

Summary of the invention

In view of above-mentioned situation, the objective of the invention is to, following a kind of Sewing machines with the needlework let-off gear(stand) is provided, promptly, can omit the use of needlework passage, make the Sewing machines arm realize closure substantially, the intrusion of leakage of oil and dust can be prevented, and, the high speed of sewing speed can be easily adapted to by realizing the cripeturaization and the lightweight of shank length.

In order to achieve the above object, the Sewing machines of band needlework let-off gear(stand) of the present invention comprises: but logically be supported on driving main shaft interlock in the Sewing machines arm, be supported in the shank of the leading section of Sewing machines arm to the above-below direction reciprocating motion with inserting by crank mechanism; Be installed in the pin of this shank bottom; Be contained in the part of making of the formation looper of leading section of Sewing machines base plate and grey cloth feed mechanism etc.; The yarn changing device that the tension force of the needlework that are supplied in pin and looper and looper line is adjusted; And pumping along with above-mentioned shank, to the needlework let-off gear(stand) of deriving to the needlework of pin supply via yarn changing device and location needlework passage, but described needlework let-off gear(stand) with the reciprocating motion of shank above-below direction be supported in the left part the Sewing machines arm about substantially on the front face in centre position, if the movable needlework with the synchronous interlock of pumping of shank at the reciprocal swing movement of above-below direction are derived member, derive the leading section of member and the cardinal principle pars intermedia of length direction at these movable needlework, formation makes the needlework of deriving and pass through the supply of fixation needlework road from yarn changing device, the 1st needlework leadout hole and the 2nd needlework leadout hole towards the pin decline guiding that is installed in the shank lower end, between the 1st needlework leadout hole and the 2nd needlework leadout hole in described movable needlework derivation member, make the needlework part that remains on this two needlework leadout hole derive the needlework guide part of the 3rd needlework leadout hole of guiding downwards with crooked state if having, its characteristics are, the scope of pumping of described shank is set to: even rise at this shank under the state of top dead-centre, and the scope that does not also stretch out from the upper wall portion of the leading section of Sewing machines arm upward its upper end.

Employing has the present invention of the structure of These characteristics, owing to omitting the needlework passage that uses for the needlework derivation, therefore do not need length with shank to make its upper end and stretch out such degree upward from the upper wall portion of the leading section of Sewing machines arm, by realizing the cripeturaization and the lightweight of shank length, can easily adapt to the high speed of sewing speed.And, upper wall portion at the leading section of Sewing machines arm, though be formed with the hole that the assembling shank is used usually, but this hole is not use fully when generality is made, so it is for example inaccessible with block in advance, just can make the Sewing machines arm realize closure substantially, invade effect in the Sewing machines arm thereby have leakage of oil in the time of to prevent that generality from making and dust.

Other purpose of the present invention and effect thereof can obtain clear and definite in the example of following explanation.

Description of drawings

Fig. 1 is for using the whole front view of three pin flat lock-stitch machines of the present invention.

Fig. 2 is the stereogram of the major part structure of the needlework let-off gear(stand) in the same three pin flat lock-stitch machines of expression.

Fig. 3 is the enlarged front view of the major part of Fig. 2.

Fig. 4 is the amplification left side view of the major part of needlework bearing support.

Fig. 5 derives the front view that member is in lifting position (top dead-centre) state for the movable needlework in the same three pin flat lock-stitch machines of expression.

Fig. 6 derives the front view that member is rocked to down position (bottom dead centre) state for the movable needlework in the same three pin flat lock-stitch machines of expression.

Fig. 7 derives the front view that member is in lifting position (top dead-centre) state for movable needlework in the same three pin flat lock-stitch machines, during needleless line bearing frame.

Fig. 8 derives the front view that member is rocked to down position (bottom dead centre) state for movable needlework in the same three pin flat lock-stitch machines, during needleless line bearing frame.

The specific embodiment

Example of the present invention is described with reference to the accompanying drawings.

Among Fig. 1～Fig. 3, the 1st, the Sewing machines arm, the 2nd, the Sewing machines base plate, supporting shank 3 in the left part of Sewing machines arm 1 (leading section), this shank 3 can move back and forth on above-below direction by known crank mechanism and slotting logical driving main shaft (not shown) interlock that is supported in this Sewing machines arm 1, and at these shank 3 places, in abutting connection with shape be provided with blank feeding pressure mechanism (on business knowing the explanation that the Therefore, omited is detailed).

Bottom at described shank 3, by pin folder 43 pins 5 are installed, simultaneously, the scope of pumping of this shank 3 is set at: even arrive in this shank 3 ascending motions under the state of top dead-centre, the scope that does not also stretch out from the upper wall portion 1A of the left part of Sewing machines arm 1 upward its upper end.Take in the parts (on business knowing the explanation that the Therefore, omited is detailed) of the sewing that constitutes needle plate and looper and grey cloth feed mechanism etc. in the left part of Sewing machines base plate 2 again.

The front face in centre position roughly about described Sewing machines arm 1, be provided with as the movable needlework of needlework let-off gear(stand) and derive member 8, these movable needlework are derived member 8 along with deriving the positive and negative driving rotational of axle 6 with the needlework of described driving main shaft interlock, derive pumping synchronously of platform 7 and shank 3 by needlework, on these needlework derivation axle 6 above-below directions (arrow u-d direction), carry out oscillating motion up and down reciprocatingly as fulcrum.Derive the front face of the Sewing machines arm 1 on member 8 right sides at these movable needlework, dispose

location needlework passage

13 and 3 variable needlework passages 17, this location needlework passage 13, with can be respectively to the derivation of 3

needlework

9 and 1 looper line 10 and the frictional resistance of giving carries out 4 yarn changing devices 11 of line tension adjustment derives in 4 lines of guiding, with Set Status 3 needlework 9 are formed to the needlework feeding means 12 one installation that these needlework 9 apply lubricating oil by the back, the structure of 3 variable needlework passages 17 is, 3 needlework 9 after will locating needlework passage 13 by this can be inserted respectively on the line passage installing rack 14 that earthing and location needlework passage 13 fixedly be connected with, by slotted hole 15 and screw 16 can be on above-below direction (arrow u1-d1 direction) respectively freely change of location fix.

Derive preceding (left side) end of member 8 and the roughly pars intermedia of length direction thereof at described movable needlework, make 3 needlework 9 of deriving and being undertaken financial-supply-leading from yarn changing device 11 by location needlework passage 13 and variable needlework passage 17, the needlework that are fixed in up and down centre position roughly of break-through Sewing machines arm 1 left part are derived formed needlework hole 18a on the guide 18, in 3 pins 5 descend each 3 of guiding the 1st, the 2nd

needlework leadout hole

8A, 8B is formed on the sustained height position respectively side by side, derive on member 8 parts at the movable needlework between the 1st needlework leadout hole 8A and the 2nd needlework leadout hole 8B simultaneously, be connected with needlework guide portion 8a integrated, this needlework guide portion 8a is passing through its two needlework leadout hole 8A, about needlework part 9a between 8B bends to downwards roughly under the state of V word shape of symmetry, stagger and form deriving the 3rd needlework leadout hole 8C upper-lower position among 3 of guiding.

Again, position in the way of the needlework feed path between the needlework hole 18a that the 1st needlework leadout hole 8A and the needlework of described movable needlework derivation member 8 front ends are derived guide 18, as shown in Figure 2, setting has the needlework bearing support 19 of 3 needlework support 19a, these 3 needlework support 19a just derive under the state of member 8 (d direction) swing downwards at movable needlework, 3 the needlework part 9b that will be positioned between the 1st needlework leadout hole 8A and the 3rd needlework leadout hole 8C lives with curved position frame upward respectively, this needlework bearing support 19, it is fixing to utilize slotted hole 20 and screw 21 can carry out the upper-lower position change in the upper part of needlework guiding guider 18.3 needlework support 19a of this needlework bearing support 19 as shown in Figure 4, forms right side (looper enters a time side the earliest of needlework ring) for the highest, and middle and left side reduces the stepped shape in area successively.

Use has three pin flat lock-stitch machines of the needlework let-off gear(stand) of said structure, when making common general blank, thickness according to the thickness of making blank and needlework 9, the factor of retractility etc., in advance variable needlework passage 17 is carried out the position adjustment of above-below direction (arrow u1-d1 direction), make the length of needlework feed path accord with the derived quantity of 3 needlework 9, promptly, the state that the length of the needlework feed path the when length of the needlework feed path when rising to top dead-centre by adjusting to shank 3 drops to bottom dead centre with shank 3 equates substantially uses, deriving by yarn changing device 11, frictional resistance is adjusted to 3 needlework 9 keeping suitable line tension quilt derivation afterwards guiding, derive the order of the needlework hole 18a of guide 18 according to the 2nd needlework leadout hole 8B → the 3rd needlework leadout hole 8C → the 1st needlework leadout hole 8A → needlework of location needlework passage 13 → variable needlework passage 17 → movable needlework derivation member 8 and carry out break-through, towards the direction decline guiding of 3 pins 5.

Under this state, in case shank 3 and pin 5 carry out actuation movement up and down reciprocatingly, then movable needlework derive member 8 with its synchronously, needlework derived axle 6 carry out the oscillating traverse motion of above-below direction (arrow u-d direction) as the center, keep line tension and the suture form that forms by yarn changing device 11 on one side well, on one side the derived quantity of needlework 9 is suitably controlled, to guarantee not making 3 needlework 9 take place to relax or do not apply excessive tension force, how thick no matter make blank has, and all can requirement according to the rules make.

On the other hand, resemble microfiber quality and so on, making by organizing very soft and when being rich in the blank that the raw material of retractility form, in order to make the needlework of supplying with by location needlework passage 13 and variable needlework passage 17 9, derive the 2nd needlework leadout hole 8B that forms on the member 8 according to movable needlework, the order of the 3rd needlework leadout hole 8C and the 1st needlework leadout hole 8A is passed through, the needlework hole 18a that derives guide 18 via needlework is to pin 5 guiding that descends, owing to will remain on the total length lengthening that these movable needlework are derived needlework 9 parts on the member 8, and make this length needlework 9 parts become V word shape by the downward general curved of the 3rd needlework leadout hole 8C midway, so will guarantee do not make line tension make the suitable value of fault by the derivation frictional resistance that yarn changing device 11 is given needlework 9, and, make movable needlework derive the mobile interlock of decline of member 8 and shank 3 and pin 5, from lifting position oscillating motion shown in Figure 5 to down position shown in Figure 6 the time, can adopt following 3 kinds of methods, promptly, (a) will derive the distance L increase gradually downwards of the 1st needlework leadout hole 8A of member 8 front ends from variable needlework passage 17 to movable needlework, (b) from the 2nd needlework leadout hole 8B to the needlework part 9a of the 3rd needlework leadout hole 8C posture that gradually changes downwards, making the needlework that overcome the derivation frictional resistance of being given by yarn changing device 11 derive power f strengthens downwards gradually, (c) deriving member 8 at movable needlework is rocked to than the down position of Fig. 6 slightly during the top position, needlework part 9b between the 3rd needlework leadout hole 8C and the 1st needlework leadout hole 8A is lived by the needlework support 19a frame of needlework bearing support 19, under this state, along with movable needlework derivation member 8 is rocked to the down position of Fig. 6 and is changed curved position upward by the needlework part 9b that frame is lived, the needlework that overcome the derivation frictional resistance of being given by yarn changing device 11 by further enhancing are derived power f, and the needlework derived quantity is increased downwards gradually.

Like this, because the derived quantity that movable needlework are derived 8 pairs of needlework 9 of member is to increase gradually downwards, therefore, even resemble microfiber quality and so on, will be by organizing very soft and being rich in blank that the raw material of retractility form as the occasion of making object, also can make pin 5 connect blanks and needlework part when arriving bottom dead centre and make pin 5 connect blank and needlework part when top dead-centre rises from bottom dead centre, under the state of not strained, can have slackness slightly by brute force, during the blank feeding, the stitching of being lived by the claw hook of needle plate is successfully deviate from from pawl, and, when pin 5 connects blank from the top, needlework thrust downwards in the blank part that connects the position or when pin 5 when extract the below of blank, needlework and the looper line stranded with it are thrown off and are raised the overtighten power that is caused in the blank at position and can be eliminated, and can avoid the making that the position forms semi-conical of blank and the reduction of the sewing quality of protuberance etc.

Again, 3 needlework support 19a of needlework bearing support 19, be arranged on position in the way of the needlework feed path between the needlework hole 18a of the 1st needlework leadout hole 8A that described movable needlework derive member 8 front ends and needlework derivation guide 18, because 3 needlework support 19a as shown in Figure 4, be to become right side (looper enters a time side the earliest of needlework ring) for the highest, middle and left side reduces the stepped shape in area successively, so even looper resembles the wire loop of left side slack-off constantly to entering of 3 needlework ring being formed at blank below, the slackness that also can guarantee 3 needlework 9 when movable needlework are derived member 8 arrival down positions is impartial substantially, when making the blank of the tissue softness that resembles microfiber quality and so on, can prevent from reliably also to make that the position forms semi-conical and the reduction of the sewing quality of protuberance etc.

Above-mentioned example is described the structure that needlework bearing support 19 is set, as shown in Figure 7 and Figure 8, in not being provided with three pin flat lock-stitch machines of needlework bearing support 19, also can rely on the effect of the (a) and (b) of having stated, by making movable needlework derive member 8 derived quantity of needlework is strengthened gradually, can prevent that the sewing quality when making the blank of the tissue softness that resembles microfiber quality and so on from reducing.

Again, above-mentioned example is described the example of the spininess flat lock-stitch machine that is applied to three pins etc., also is applicable to double-thread overlock sewing machine certainly.

Shown in the arrow u2-d2 of Fig. 3, preferably movable needlework are derived the needlework guide portion 8a that has the 3rd needlework leadout hole 8C in the member 8, but adopt movable relatively needlework to derive the fixing structure of member 8 above-below direction free positions change.In this occasion, utilize the upper-lower position change of needlework guide portion 8a, up-down adjustment is carried out in the position of the 3rd needlework leadout hole 8C, can further increase the control range that movable needlework are derived member along with the derived quantity of oscillating motion up and down reciprocatingly.

Claims

1. Sewing machines with the needlework let-off gear(stand) comprises: but logically be supported on driving main shaft interlock in the Sewing machines arm, be supported in the shank of the leading section of Sewing machines arm to the above-below direction reciprocating motion with inserting by crank mechanism; Be installed in the pin of this shank bottom; Be contained in the part of making of the formation looper of leading section of Sewing machines base plate and grey cloth feed mechanism etc.; The yarn changing device that the tension force of the needlework that are supplied in pin and looper and looper line is adjusted; And the needlework let-off gear(stand) of deriving along with the pumping of described shank, to the needlework of supplying with to pin via yarn changing device and location needlework passage,

But described needlework let-off gear(stand) with the reciprocating motion of shank above-below direction be supported in the left part the Sewing machines arm about substantially on the front face in centre position, if the movable needlework with the synchronous interlock of pumping of shank at the reciprocal swing movement of above-below direction are derived member, derive the leading section of member and the cardinal principle pars intermedia of length direction at these movable needlework, formation makes the needlework of deriving and pass through the supply of fixation needlework road from yarn changing device, the 1st needlework leadout hole and the 2nd needlework leadout hole towards the pin decline guiding that is installed in the shank lower end, between the 1st needlework leadout hole and the 2nd needlework leadout hole in described movable needlework derivation member, make the needlework part that remains on this two needlework leadout hole derive the needlework guide part of the 3rd needlework leadout hole of guiding downwards with crooked state if having

It is characterized in that,

The scope of pumping of described shank is set to: even rise at this shank under the state of top dead-centre, and the scope that does not also stretch out from the upper wall portion of the leading section of Sewing machines arm upward its upper end.

2. the Sewing machines of band needlework let-off gear(stand) as claimed in claim 1 is characterized in that, the Sewing machines of applicable object is spininess flat lock-stitch machine or double-thread overlock sewing machine.