KR20080014655A - Thread chain tuck mechanism for over lock sewing machine - Google Patents

Abstract

A thread chain tuck mechanism for an over lock sewing machine is provided to construct the entire structure simply with the low cost without using the operating components. A saw tooth groove(5) is formed at a needle plate(2). The saw tooth is engaged with the saw tooth groove and moved forward and backward so that the cloth is transferred toward the sewing advance direction(X) in turn. Needle falling grooves(6,7) including needle falling portions(D1,D2) are formed at the outside edge of the saw tooth groove. Two needle plate claws(8,9) are formed toward the sewing advance direction along the needle falling grooves and support the edge portion of the cloth. A concave hole(11) is formed at the needle plate side wall(2a) and a vacant ring guide groove(12) is formed at the upper surface of the needle plate.

Description

Void sewing machine of the overlock sewing machine {THREAD CHAIN TUCK MECHANISM FOR OVER LOCK SEWING MACHINE}

The present invention relates to an annular sewing apparatus for overlock sewing machines. In detail, when the sewing is finished when the edge of the cloth is closed, the operator continues to hold and move forward, while the operator pulls the cloth forward in the sewing progress direction after sewing is completed, after the sewing is completed. As a result, the sample is drawn out to the front of the needle plate including the needle dropping portion, held in the aforesaid retaining means installed in front of the needle plate, cut off from the cloth, and then sewn into the state held in the state of the holding means. It relates to the sewing machine of the overlock sewing machine which automatically sews into the sewing stitch of the cloth (hereinafter referred to as stitching), and aims at preventing the loosening of the oar of the sewing start, and in particular for the sewing sewing of the two stitches overlock sewing machine To a suitable device.

In this kind of two-needle overlock sewing machine, the needle plate is formed with two needle drop grooves inside and outside including needle drop portions corresponding to each of the two needles in parallel in a direction substantially perpendicular to the sewing progress direction. In addition, two needle plate claws are directed from the front edge of these needle drop grooves to each needle drop groove in the sewing progress direction. These two inner and outer needle plate claws support the fabric portion located between the inner and outer two needle drop grooves at the time of predetermined sewing from below, so that the occurrence of the jump due to the local recess of the fabric portion or the tension of the thread It has the effect of preventing the fabric from locally bulging in the center and deteriorating the finishing feeling, and is effective for obtaining a good sewing finishing feeling.

By the way, in the conjugate stitching device of the 2-needle overlock sewing machine having two needle plate claws inside and outside, when the cloth is pulled to the front (seam proceeding direction rear side) while pulling the cloth forward in the sewing progress direction after sewing completion, In the state of being wound around these needle claws, the widely formed annular exits the needle plate claw, enters the inner needle drop groove, and is pulled straight forward from the front edge of the needle drop of the inner needle drop groove to maintain the vacancy. Since it is held in the means, when two needles reciprocate (one rotation of the sewing machine) to sew the next fabric, the upper looper thread and the lower looper thread pass through the outer needle drop groove and the lower looper (not shown). By the needle thread into the needle drop section of the inner needle drop groove, and then the two needles reciprocate (twice During needle stitching, the outer needle is sewn into the upper looper thread and the lower looper thread and sewed, and as a result, after the second needle stitch, the sewing start end of the next sewing fabric reaches the needle drop portion. There arises a problem that the vacant formed at the end is rounded at the end of the sewing start end of the cloth, and becomes a dumpling shape, so that a predetermined stitch cannot be performed.

This problem is caused by the fact that the upper looper thread and the lower looper thread are wound around the inner needle plate claw formed on the needle plate of the 2-needle overlock sewing machine to form a wide range. As a means of eliminating the occurrence of the above-mentioned problem in accordance with this cause, the inner needle plate when moving and holding the cloth immediately forward while pulling the fabric after sewing is completed, as disclosed in Japanese Unexamined Patent Publication No. 56-28554 The claw is moved forward from the forward position parallel to the outer needle plate claw so that the vacant is formed only on the outer needle plate claw rather than on the inner needle plate claw so that the vacancy is directly forward from the front edge of the needle drop of the outer needle drop groove. It is constructed so that it can be withdrawn, but as disclosed in Japanese Unexamined Patent Publication No. 9-182884, the operation starts when the cloth is pulled and moved to the front while pulling the cloth, and the ball is brought into contact with the ball. Inward of the sewing progress direction outward from the distal end of the outer needle plate claw It has been proposed to install the guide member of gonghwan driven rotary bar for guiding air out.

In addition, as disclosed in Japanese Patent Laid-Open No. 56-104696, the inner and outer two are positioned at the front position in the sewing progress direction than the front end of the two inner and outer needle plate claws in accordance with the tensile movement of the cloth after the sewing is completed in the sewing progress direction. When the pull is pulled out from the needle plate claw, the ring is slid by the first guide cam surface which engages with the threads forming these rings to assemble these threads, and the grip movement moves to the front of the fabric immediately thereafter. It has also been proposed that the fixed projection for a deflecting deflection having a second guide cam surface guiding into the needle drop groove is formed integrally with the needle plate by being positioned on the same plane as the two needle plate claws.

However, as proposed in Japanese Patent Publication No. 56-28554 or Japanese Patent Application Laid-open No. Hei 9-182884, the movable parts such as a retractable inner needle plate claw or a rotary annular guide are described. In use, not only the drive mechanism of the movable component itself but also a synchronous linkage mechanism for operating the movable component in synchronism with the sewing operation of the sewing machine is required, resulting in a complicated structure and an increase in cost. In addition, foreign matters such as seams are likely to be entangled in the movable parts, and when such foreign matters are entangled, predetermined movements of the movable parts are not performed smoothly and sufficiently, and as a result, the vacancy is rounded at the end of the sewing start end of the cloth and remains. It is impossible to reliably solve the problem of being unable to make a predetermined lock.

In addition, as proposed in Japanese Patent Application Laid-open No. 56-104696, in the case where the fixed projection for a deflection deflection is integrally formed with the needle plate, the structure is much simpler than using the above-described movable parts, and the cost can be reduced. Although it can be planned, the fixed projection for asymmetrical deflection is formed at the same plane position as the inner and outer two needle plate claws, and thus the fabric is sewn between the first guide cam face of the fixed protrusion and the two needle plate claws. It is necessary to form a gap enough to allow the air to pass during the tension movement in the forward direction, so that the leading end of the first guide cam surface is in the sewing forward direction ahead of the tip of the inner needle plate claw. Will be located away. In addition, since the second guide cam surface for guiding and introducing the vacant thread collected in the first guide cam surface into the outer needle drop groove is formed on the rear surface (surface in the sewing progress direction front side) of the fixing projection, 2 In order to be able to perform smooth transition to the guide cam surface smoothly, it is impossible to protrude too much the end of the fixed projection outward.

Therefore, the action of pulling out the vacancy from the needle plate claw and guiding the vacancy into the outer needle drop groove depends on the skill of moving the fabric by the operator after sewing is completed. There was a problem that it is not easy to fall out or the vacancy is not guided well into the outer needle drop groove, which is likely to cause trouble in the lock.

The present invention has been made in view of the above circumstances, and the movable parts are not used at all, and the whole structure can be constituted with a simple structure and low cost, and the effect of drawing out the empty from the needle plate claw and the outside of the empty It is an object of the present invention to provide an overlock sewing machine sewing machine capable of reliably and satisfactorily performing a certain stitching time by ensuring the guiding guide action to the needle drop groove regardless of the skill of the operator.

In order to achieve the above object, the overlock sewing machine sewing machine according to the present invention is formed in parallel to the direction of orthogonal to the sewing progress direction, and the inner and outer two needle drop grooves including the needle drop portion is formed, From the front edge of the needle dropping groove of the two needle dropping grooves, each needle dropping groove is directed toward the front of the sewing progression direction, and the inside and the outside of the two needle dropping grooves are kept to be able to pull out the continuation formed on the fabric. A needle plate provided with a needle plate claw and a needle plate claw are disposed in front of the needle plate claw in the sewing progress direction, and are pulled out of the needle plate claw by moving the cloth after sewing completion in front of the sewing direction in the sewing progress direction. With a vacant holding means for holding vacant points drawn out in front of me and In the annular sewing apparatus of the overlock sewing machine, the start end portion is located on the lower surface side of the needle plate immediately after the needle drop portion of the inner needle drop groove in the sewing advance direction rather than the distal end portion of the inner needle plate claw, and the end portion thereof. The part is located in the front outward direction of the sewing progress direction than the distal end of the outer needle plate claw, and in contact with the annulus at the time of tension pulling movement of the cloth between these distal end and the distal end, this ring is the outer needle. An annular guide member having a guide surface slidably in contact with the outside of the plate claw in a sliding direction is fixed.

According to the present invention having the above-described feature configuration, when the operator pulls the fabric to the front of the sewing progress direction after sewing is completed and moves it to the front, the vacant guide which starts to escape from the needle plate claw according to the tension is guided by the vacant guide. The abutment is brought into contact with the guide surface of the member, and is then guided in sliding contact with the front and outer side of the outer needle plate claw along the guide surface, and the air formed by being wound around the inner and outer two needle plate claws is released from these needle plate claws, After the escaped relief is guided outward to the outside of the front end of the outer needle plate claw, it is guided into the outer needle drop groove to be caught by the leading edge of the needle drop part, and then drawn out to the front immediately from the locking position, Retained in the retaining means. In this state, when two needles reciprocate one time, the upper looper thread and the lower looper thread pass over the inner needle plate claw and enter together with the needle thread into the needle drop of the inner needle drop groove, which causes the next two needles. In the reciprocating motion of the outer needle, the outer looper thread is inserted into the upper looper thread and the lower looper thread so that the vacant stitches do not occur at all. Therefore, during normal sewing, the fabric is stably supported by two inner and outer needle plate claws, and a good sewing finishing feeling can be obtained while eliminating the occurrence of swelling defects of convex form due to skipping sweat or thread tension. Regardless of the presence of the plate claw, it is possible to reliably and smoothly perform a predetermined stitch.

In addition, the tension movement operation of the cloth by the operator is performed by the operator taking out the vacant operation as described above and the relief guiding action toward the outside outward from the outer needle plate claw tip of the ring by simply fixing the vacant guide member on the lower surface side of the needle plate. Since it can be reliably performed irrespective of a skill, compared with using the movable parts as before, the whole apparatus can be comprised simply and compactly, and the cost can be reduced.

In the annular sewing apparatus of the overlock sewing machine according to the present invention, the guide surface of the annular guide member may be formed in a linearly inclined shape by linearly connecting the start end and the end portion thereof, and as described in claim 2, It is preferable to form substantially circular arc shape between the start end and the end. In this case, the ring formed by being wound around the needle plate claw can be easily escaped without deteriorating the stitching state, and the relief guide can be smoothly guided outward from the front end of the outer needle plate claw.

In addition, in the sewing machine of the overlock sewing machine according to the present invention, an outer needle plate claw of the two inner and outer needle plate claws has a distal end that protrudes longer in the sewing direction than the distal end of the inner needle plate claw, and is approximately In addition to being formed in an arc shape, it is preferable that the outer edge portion is gradually inclined inward as it reaches the tip portion, and is formed in a preliminary shape.

Furthermore, in the retraction sewing device for overlock sewing machine according to the present invention, the recirculation guide member may be formed integrally with the needle plate, but is formed as a separate part from the needle plate as described in claim 5, and this separate part It is preferable to set it as the structure which screw-fastens the vacant guide member to the lower surface of a needle plate. In this case, it is possible to use the existing needle plate as it is, without requiring special research for the production of the needle plate, so that it is possible to reduce the manufacturing cost by one layer, and also to change the size and shape of the needle plate in accordance with the type of thread. Other annular guide members can be used interchangeably.

Other effects will be apparent in the description of the following examples.

Advantageous Effects of Invention According to the present invention, the movable parts are not used at all, and the whole structure can be constituted with a simple structure and low cost. There is provided an overlock sewing machine sewing machine capable of assuring irrespective of the operating skill of an operator so that a predetermined lock can always be surely and satisfactorily performed.

Fig. 1 is a schematic plan view of a two-needle overlock sewing machine sewing machine according to the present invention. In Fig. 1, 1 is a cross plate, and the needle plate 2 is fixed to an upper surface of the cross plate 1. have. 3 is an annular retainer (an annular retaining means) provided just in front of the sewing plate 2 in the sewing progress direction X, and the annular retainer 3 presses and holds the annular cutting scalpel and the annular cut after cutting. The holder is provided. On the other hand, since this annular retainer 3 is well-known, the illustration of the specific structure is abbreviate | omitted.

As shown in FIG. 2, the needle plate 2 is provided with a tooth groove 5 through which the teeth 4 (see FIG. 1), which sequentially transmit the cloth K toward the sewing progress direction X, move in and out. It is. In the position near the outer edge of the tooth groove 5, needle drop portions D1 and D2 are included in correspondence with two needles (not shown) provided in parallel in a direction substantially perpendicular to the sewing progress direction X. The needle drop grooves 6 and 7 are formed, and the needle drop grooves 6 and 7 are followed from the front edges of the needle drop portions D1 and D2 of the needle drop grooves 6 and 7. Two needle plate claws 8 and 9, which are directed toward the sewing progress direction X, are formed. The inner and outer two needle plate claws 8 and 9 support the edge-hiding portion of the cloth K, and the sewing end E of the cloth K passes through the needle drop portions D1 and D2. After sewing is completed, it maintains so that the ring (C) which is formed continuously to the sewing end (E) of the said cloth (K) can be taken out. In addition, a recess 11 for inserting a cloth trimming scalpel 10 (see FIG. 1) into the needle plate side wall portion 2a behind the needle drop grooves 8 and 9 in the sewing progress direction X is provided. And an annular guide groove 12 is formed on the upper surface of the needle plate 2 portion behind the bottom wall surface of the concave hole 11 in the sewing progress direction X in a state parallel to the sewing progress direction X. It is.

Outer needle plate claws (9) of the inner and outer needle plate claws (8, 9) have a front end portion (9a) longer in the sewing progress direction (X) than the front end portion (8a) of the inner needle plate claws (8). It protrudes and is formed in the shape of an arc, and the outer edge part 9b is gradually inclined inward as it reaches the tip part 9a so that the extraction of the ring C can be melt | dissolved, and it is formed in a predecessor shape. In addition, the leading edge 7e of the needle drop portion D2 of the outer needle drop groove 7 has a sewing line claw 9 side with respect to a parallel line connecting the two needle drop portions D1 and D2 in the sewing progress direction. (X) It is formed in the inclined edge located behind.

A thin plate made of a needle plate 2 and a separate part on the lower surface of the needle plate 2 located in the sewing forward direction X in front of the tip portions 8a and 9a of the inner and outer needle plate claws 8 and 9. The annular guide member 13 is fastened and fixed through the screw 16. The annular guide member 13 has a needle drop portion of the inner needle drop groove 6 whose front end portion 14a is just in front of the sewing advance direction X than the front end portion 8a of the inner needle plate claw 8 ( Immediately after D1), its end portion 14b is located outward in the sewing advance direction X than the front end portion 9a of the outer needle plate claw 9, and these start end portions 14a and end portions 14b are positioned. ) Pull out the needle plate claws (8, 9) when the fabric (K) after the sewing completion is pulled and moved to the front of the needle drop portions (D1, D2) while pulling in the sewing advance direction (X). An annular guide surface 14 that is curved in an arc shape is formed so that the annular ring C, which has begun to exit, abuts and guides the annular ring C by sliding contact outward from the front end portion 9a of the outer needle plate claw 9. It is.

Next, the operation | movement of the conjugate sewing apparatus of the 2-needle overlock sewing machine of the said structure is demonstrated, referring FIG. 5, FIG.

In the state where the end of sewing E of the cloth K passes through the needle drop portions D1 and D2 and the predetermined sublimation is completed, the end of sewing E of the cloth K is illustrated as shown in FIG. 5. A ring (C) is formed widely in the state wound around the inner and outer needle plate claws (8, 9).

Subsequently, when the operator grasps the cloth K and pulls it toward the sewing progress direction X, while the operator grasps and moves it as shown by the arrow Z toward the front of the needle dropping portions D1 and D2, The annulus C wound around the inner and outer needle plate claws 8 and 9 starts to escape from these needle plate claws 8 and 9, and the substantially circular arc annular guide surface 14 of the annular guide member 13 is formed. Abuts against the starting end 14a of the c), and is then guided in sliding contact along the guide surface 14 toward the front outward so as to be reliefably moved forward outward than the front end 9a of the outer needle plate claw 9. The ring C reliably escapes from the needle plate claws 8 and 9. Subsequently, the exit ring C is extended and guided into the outer needle drop groove 7 while being extended, and is caught by the inclined leading edge 7e of the needle drop portion D2 of the outer needle drop groove 7. As shown in FIG. 6, it pulls out immediately from the latching position, and is hold | maintained in the annular retainer 3 (refer FIG. 1) just before the needle drop part D1, D2.

At this time, the annulus C is kept outward from the extension lines of the needle drop portions D1 and D2 while the part is cut and kept in the extended state, so that when the two needles reciprocate, the upper looper thread and the lower portion The looper thread passes over the inner needle plate claw 8 and enters the needle drop portion D1 of the inner needle drop groove 6 together with the needle thread, which causes the outer needle during the reciprocating motion of the next two needles. The ball is sewn into this upper looper thread and the lower looper thread to sew the air. As a result, the phenomenon that the voids formed during the second sewing stitch until the sewing start end of the next sewing cloth reaches the needle dropping portions D1 and D2 is rounded at the end of the sewing start end of the cloth to form a dumpling shape. Since it does not occur at all, it is possible to reliably and smoothly sew the ring (C) to the beginning of the sewing of the next sewing cloth.

As described above, only the fixed guide member 13 is fixed to the lower surface side of the needle plate 2, so that the whole apparatus can be configured in a simple and compact structure as compared to using the movable parts as in the prior art. Although the reduction can be achieved, the above-mentioned extraction operation of the annular C and the relief guide operation of the annular C to the front outward than the distal end 9a of the outer needle plate claw 9 are operated. It can be performed reliably regardless of the skill of the movement operation of the cloth, and the predetermined stitching can be performed reliably and smoothly.

In addition, in the said embodiment, it demonstrated that the guide surface 14 of the said annular guide member 13 was formed in substantially circular arc shape, In addition, the straight line which connected linearly between the start end part 14a and the termination part 14b in addition to this is explained. Any shape may be used as long as it exhibits a function of guiding the annular C such as one formed in an inclined shape to the front outer portion than the tip portion 9a of the outer needle plate claw 9.

1 is a schematic plan view of a two-needle overlock sewing machine sewing apparatus according to the present invention.

FIG. 2 is a plan view of a needle plate that is a main part of FIG. 1. FIG.

3 is an enlarged side view of the main portion of FIG. 2.

4 is an enlarged cross-sectional view taken along the line Y-Y of FIG.

5 is a plan view of the main portion showing a state in which the vacancy is formed.

It is a top view of the principal part which showed the maintenance state of the vacancy when the cloth after sewing completion was pulled forward just in the sewing progress direction.

Claims (5)

Parallel to the sewing progress direction in a direction orthogonal to each other, the inner and outer two needle drop grooves including the needle drop portion is formed, and the needle drop grooves from the front edge of the needle drop portion of the two inner and outer needle drop grooves to follow each needle drop groove. Needle plate claws which are directed toward the front of the sewing progress direction to hold the vacant formed continuously on the cloth at the time of sewing completion, and the needle plate provided in front of the sewing progress direction more than this needle plate. The overlock sewing machine is provided with an annular retaining means arranged to hold the retracted cloth pulled out of the needle plate claw and pulled straight forward while pulling the cloth after sewing completion in the sewing progress direction. In the avoicing sewing device, On the lower surface side of the needle plate, the starting end thereof is positioned immediately after the needle dropping portion of the inner needle dropping groove in front of the sewing progressing direction rather than the distal end of the inner needle plate claw, and the end portion thereof is located in the sewing progressing direction than the distal end of the outer needle plate claw. An annular guide member positioned forwardly outward and having a guide surface that abuts the annulus during sliding of the cloth between the start end and the end and guides the annular sliding sliding contact outwardly of the outer needle plate claw. The sewing machine of the overlock sewing machine, characterized in that is fixed. The over-stitching sewing machine according to claim 1, wherein the guide surface of the annular guide member is formed in a substantially arc shape between the start end and the end. An annular sewing apparatus for overlock sewing machines according to claim 1, wherein the guide surface of the annular guide member is formed in a linearly inclined shape by connecting the starting end portion and the end portion in a linear manner. The needle plate claw on the outer side of the two needle plate claws of the inside and outside of the needle plate claw protrudes longer in the sewing advance direction than the tip portion of the inner needle plate claw, and is formed in an arc shape. An overlock sewing machine sewing machine, characterized in that the outer edge portion is gradually inclined inwardly and is formed in a sharp shape as it reaches the tip portion. 2. The annular sewing device of an overlock sewing machine according to claim 1, wherein the annular guide member is formed as a separate part from the needle plate, and the annular guide member of the separate part is screwed to the lower surface of the needle plate. .

Images