TW201739980A - Sewing method of cloth and dual-circle stitch sewing machine capable of sewing a next cloth without performing a troublesome work which leads to a reduction in sewing work efficiency - Google Patents

Abstract

The invention includes a first step for forming a free state on a cut edge of a bent thread cut by a thread cutting device; a second step for directing the cut edge of the bent thread toward a downstream side of a sewing direction of a bent needle 3 and moving the same along the sewing direction; a third step for clipping a front edge of the cut edge of the bent thread; a fourth step for using a half rotation motion of a sewing machine to direct a middle part of the bent thread toward between left and right needles so as to maintain a position in a state of being inhibited from moving in directions except the sewing direction; and a fifth step for setting a position within a working diameter for the bent thread from an input position to a series of the output edge in the subsequent rotation motion. After the fifth step, the cut edge of the bent thread is maintained in the free state so as to perform a predetermined sewing operation. Accordingly, even there is no manual operation using a pair of scissors to cut off the cut edge of the bent thread performed at the end of sewing that may result in low efficiency, bad operation function of cloth, and damage to cloth, it is able to inhibit the remained length of the cut edge of the bent thread independent of the types of thread.

Description

Cloth sewing method and double loop sewing machine

The present invention relates to a sewing method for a cloth comprising a circular cloth and a double loop sewing machine for the sewing, that is, for example, using a double loop sewing machine represented by a double needle pattern of a horizontal cylinder to prevent, for example, a T-shirt Or sutures, such as underwear, first stitching the front and back body fabrics into the end of the loop of the circular fabric, the bottom of the crease stitching, etc., especially for the end of the looper thread that is cut after sewing. Part of the processing technology.

For example, if the bottom of the crease of the circular fabric of the double-needle sewing machine is spliced as an example, the circular fabric is conveyed along the upper surface of the needle in a predetermined sewing direction. a portion (a portion of the overlapping fabric in which the edge portion is folded back toward the back side of the fabric), and a plurality of needles are formed under the needle plate by moving a plurality of needles arranged in parallel in the direction orthogonal to the direction of travel of the sewing. And the plurality of needle loops are captured by the looping of the looper that can advance and retreat between the side of the side of the side of the plurality of stitches and the other side in a direction substantially orthogonal to the direction of travel of the stitching The plurality of needle loops that are captured by the looper thread held by the looper are looped, thereby forming a double loop stitching step on the entire circumference of the sewing portion (the overlap fabric portion) of the circular fabric.

As shown in Figs. 24(A) and (B), the double-loop stitching step as described above is formed. The double-needle stitching sewing machine of the double-needle type has two needles 1a and 1b on the left and right sides, and the like, and the left and right needle threads NTa and NTb (see FIG. 25) are reciprocated up and down with respect to the needle board 2, and traveled with the sewing machine. The direction in which the directions H are orthogonal to each other is arranged in parallel; the looper 3 can hold the looper thread LT (see FIG. 25) to advance and retreat in a direction substantially orthogonal to the upper and lower reciprocating paths of the needles 1a and 1b, and during the movement. The needle stitches NTa' and NTb' (see FIG. 25) formed under the needle plate 2 are captured, and the thread cutting device 4 is provided to extend in and out of the left front of the needle plate 2 and the looper 3 The position P1 and the retracted position P2 located further to the right rear side than the entry and exit position P1 are reciprocally driven to move, and after the predetermined sewing operation is completed, that is, when the sewing is completed, the movement is performed from the retracted position P2 to the in-and-out position P1. The cutting action is performed by looping the needle thread loops NTa' and NTb' by the looper thread LT held by the looper 3, thereby forming a double loop stitching step A of a predetermined length in the sewing fabric W.

The thread cutting device 4 is configured to cut the needle thread portions NTa1, NTb1 and the looper portion LT1 protruding to the back side of the sewing fabric W when the sewing of the double loop stitching step A of the predetermined length of the sewing fabric W is completed. 4 includes: a movable cutter 5, a fixed cutter 6, a clip-on needle thread member 7 made of a leaf spring, and a tension assisting spring 8 for adjusting the clamping force of the clip threading member 7, the clip spring made by the leaf spring The needle thread member 7 is disposed at a lower portion of the movable cutter 5, and elastically sandwiches an end portion of the cut looper portion LT1 between the movable cutter 5 and the movable cutter 5. Further, a reciprocating drive moving mechanism 9 is provided, and the reciprocating drive mechanism 9 straddles the retracting position P2 including the movable cutter 5, the fixed cutter 6, the crimping needle member 7, and the tension auxiliary spring 8 The reciprocating driving movement is performed between the in-and-out position P1, and after the thread cutting device 4 is moved to the in-and-out position P1, only the outer position (in-and-out position) and the needle-dropping position of the movable cutter 5 which is closer to the side of the needle drop position are The drive is reciprocally driven between the outer positions on the other side.

Further, since the reciprocating drive moving mechanism 9 has the same configuration as the reciprocating drive moving mechanism of the double-needle-type transverse cylindrical double-loop sewing machine according to the embodiment of the present invention described below, the corresponding constituent members are denoted by this The same symbols as those of the reciprocating drive moving mechanism described in the embodiment of the invention.

As shown in Figs. 24(A) and (B), the tangential device 4 of the conventional double-loop sewing machine having the basic configuration as described above is formed on the side edge portion of the front end of the movable cutter 5, and is formed in the movable cutter 5 The hook line catching portion 10 that hooks and catches the looper portion LT1 that protrudes to the back side of the sewing fabric W when the outer position of the needle drop position is closer to the other side toward the other side than the other side. And closer to the side edge portion of the base end of the movable cutter 5 than the looper catching portion 10, and the movable cutter 5 is formed toward the adjacent side from the outer position of the movable cutter 5 from the other side of the needle drop position When the external position is moved by the reciprocating drive, the needle thread catching portion 11 that protrudes to the left and right needle thread portions NTa1 and NTb1 on the back side of the sewing fabric W is sequentially caught and caught (for example, refer to the Japanese Utility Bulletin) -32072 bulletin).

Next, the tangential operation of the thread cutting device 4 of the above-described double-loop sewing machine will be described.

First, as shown in Fig. 25(a), at the end of the stitching, the thread cutting device 4 is moved to the outer position which is closer to the needle drop position, that is, the above-described entrance and exit position P1, and thereafter, as shown in Fig. 25(b) Only the movable cutter 5 advances in the direction of the arrow X from the above-described entry and exit position P1 toward the outer position of the needle drop position toward the other side. As shown in FIG. 25(c), the looper catching portion 10 on the distal end side of the movable cutter 5 approaches the front end of the looper 3, and is overlaid on the back side of the sewing fabric W. Immediately after moving the looper portion LT, the movable cutter 5 is moved When the moving direction is reversed, the looper portion LT1 is hooked and caught by the looper catching portion 10. Then, as shown in FIG. 25(d), the movable cutter 5 is moved in the direction of the arrow Y from the outer position closer to the other side of the needle drop position toward the entrance and exit position P1, and the reciprocating drive is moved. The right and left needle thread portions NTa1 and NTb1 that protrude to the back side of the sewing fabric W are hooked and caught by the needle thread catching portion 11. Then, the movable cutter 5 further moves in the direction of the arrow Y, and as shown in FIG. 25(e), the needle thread portions NTa1 and NTb1 captured by the needle thread catching portion 11 and the loophole catching portion 10 are captured. The looper portion LT1 is cut by sliding contact between the respective catching portions 11 and 10 and the fixed cutter 6. Thereafter, as shown in Fig. 25 (f), the needles 1a, 1b are moved above the needle plate 2, and the cut end portion LT2 of the looper thread LT1 held by the looper 3 is elastically held at the front end portion thereof. Between the movable cutter 5 and the crimping needle member 7, it is prepared for sewing. Then, the front end portion of the looper cut end portion LT2 elastically sandwiched between the movable cutter 5 and the clip threading member 7 is elastically moved in the sewing traveling direction H with the movement of the cloth accompanying the start of the next stitching. The movable cutter 5 and the clip threading member 7 are naturally pulled out (released).

In the conventional double-loop sewing machine constructed as described above, the cutting positions of the needle thread portions NTa1, NTb1 and the looper portion LT1 generated by the thread cutting device 4 do not enter into the upper and lower reciprocating paths of the needles 1a, 1b. Since the position where the needle drop position is separated from the position of the right needle 1b is further to the right outer side, the left and right needle thread portions NTa1, NTb1 and the cut end portion LT2 of the looper portion LT1 are line-remaining with a predetermined length. . In particular, the cut end portion LT2 of the looper thread is separated from the needle drop position by the needle end position to the right outer side 1b. Elastically clamped between the movable cutter 5 and the crimping needle thread member 7, the hook thread cutting end portion LT2 does not constitute a part of the stitching A of the double loop stitching at the beginning of the stitching when the next fabric portion is sewn. On the other hand, as shown in Fig. 26, the outer side of the step A is elongated in a whisker shape, thereby causing a decorative defect involving a decrease in the appearance and quality of the sewn product.

In particular, when the looper thread is a thread of a type in which a plurality of filaments are bundled, when cut by a thread cutting device, the cut end portion of the looper thread is dispersed into a plurality of filaments. The plurality of dispersed filaments protrude in different directions on the outer side of the needle step, or are lifted from the cloth surface, so that the appearance is very poor, and further decorative defects are easily caused.

In order to eliminate such a decorative defect, it is conventionally known that the sewing operator performs a manual operation of cutting the cut end portion of the looper thread which is extended from the stitching of the sewing fabric W by using scissors or the like. However, in this case, there is a problem that a complicated manual work is required for the wire cutting every time the sewing of the sewing material is finished, which not only causes the sewing work efficiency to be lowered, but also the work load on the sewing machine. Further, the degree of freedom of the hand of the sewing operator is hindered, and the workability of the cloth is deteriorated, and the sewing cloth is easily damaged by scissors or the like.

The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a workability in which the sewing work efficiency is lowered, the work load is increased, and the workability of the cloth is reduced without cutting the cut end portion of the hook thread using scissors or the like. The simplification of the manual work such as the deterioration of the fabric, the damage of the fabric, and the like, the sewing method of the cloth which is short in the length of the cut end portion of the looper, and the shortness of the appearance, and the double loop sewing machine .

In order to achieve the above object, the sewing method of the fabric of the first invention is one side. The fabric is conveyed along the upper surface of the needle plate in a predetermined sewing traveling direction, and a plurality of needle loops are formed under the needle plate by moving a plurality of needles arranged side by side in a direction substantially orthogonal to the sewing traveling direction, and borrowing The plurality of needle loops are captured by the entry and exit of the looper that can advance and retreat between the side of the side of the plurality of stitches in the direction of the plurality of stitches and the other side portion and substantially perpendicular to the direction of travel of the stitching. The plurality of needle loops captured by the looper thread held by the looper are looped, thereby forming a double stitch stitching step of the plurality of stitches on the cloth, characterized in that: the first step is to sew When the looper is positioned at the approximate entrance and exit end, the cut end portion of the looper thread that is cut by the thread cutting device disposed at the other side portion of the needle in the direction in which the needle is inserted and connected to the tip end portion of the looper is a free state; a second step of causing the cut end portion of the looper line in the free state to be a downstream side toward the sewing traveling direction of the looper and along a substantially sewing line The third direction is to move to the vicinity of the front end portion of the cut end portion of the looper line on the downstream side of the sewing traveling direction; the fourth step, in order to form an empty loop or the next step Forming a stitch in the cloth to cause the needle and the looper to perform at least a half-rotation operation, thereby guiding a portion of the looper line held near the front end portion to a vicinity of each of the stitches in the parallel direction of the plurality of stitches a set position within a range of the inter-part connection, and is maintained in a state in which the movement of the middle portion of the looper thread from the set position guided thereby is prevented from being moved except the sewing travel direction; and the fifth step, which is continued in the fourth step The needle in the rotation operation of the needle and the looper after the step is from the vicinity of the top dead center and the position of the looper from the vicinity of the entrance and exit end to the position where the needle reaches the vicinity of the bottom dead center and the looper reaches the vicinity of the retraction end. The setting operation position in the range of the rotation operation between the two is released, and the holding of the vicinity of the end portion of the cut end portion of the looper thread is released; after the fifth step, the looper is made The cut-end part remains free state be established while sewing.

Further, in the sewing method of the cloth according to the second aspect of the present invention, the overlapping fabric portion in which the edge portion of the circular fabric is folded back toward the back side of the fabric is conveyed toward the predetermined sewing traveling direction along the upper surface of the needle plate. Forming a plurality of stitch loops under the needle plate by moving a plurality of needles arranged side by side in a direction substantially orthogonal to the direction of travel of the sewing, and by straddle one side of the parallel direction of the plurality of needles Engaging and exiting the looper between the other side portion and the direction orthogonal to the sewing traveling direction to capture the plurality of stitch loops, and capturing the plurality of stitch loops by the looper thread held by the looper a loop of the stitching ring, wherein the stitching step of the double-loop stitching is formed on the entire circumference of the overlapping cloth portion of the circular fabric, wherein the stitching step has a first step, and the looper is substantially in and out after the sewing is completed. At the end, the cut end portion of the looper thread which is cut by the thread cutting device disposed at the other side portion of the needle in the side direction of the needle and connected to the needle end portion of the looper is formed a second step of moving the cut end portion of the looper line in the free state so as to be on the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; And maintaining the vicinity of the front end portion of the cut end portion of the looper thread on the downstream side of the sewing traveling direction; and in the fourth step, the needle and the looper are formed in order to form an empty loop or form a stitch on the next fabric. At least a half-rotation operation is performed to guide a portion of the looper line held in the vicinity of the front end portion to a set position within a range in which the vicinity of each of the stitches in the parallel direction of the plurality of stitches are connected, and a state in which the movement from the set position guided by the middle of the looper line is prevented except for the travel direction of the sewing; and a fifth step of rotating the needle and the looper after the fourth step The needle in the vicinity of the top dead center and the position of the looper from the vicinity of the entrance and exit end to the position where the needle reaches the bottom dead center and the looper reaches the vicinity of the retraction end Setting operation position within a range between the rotational operation, the lifting of said looper thread The cutting end portion is held in the vicinity of the front end portion; after the fifth step, the cut end portion of the hook thread is held in a free state to perform predetermined sewing.

Further, the double-loop stitch sewing machine according to the third aspect of the present invention includes a needle plate that is provided for the cloth and guides the conveyance toward the predetermined sewing traveling direction; the plurality of needles are oriented substantially perpendicular to the traveling direction of the sewing. Parallelly arranged to hold the needle thread and move up and down; the looper, which holds the looper thread, can span between one side of the side of the plurality of stitches and the other side and in a direction substantially orthogonal to the direction of travel of the stitching Performing a forward and backward movement, and capturing a plurality of needle thread loops formed under the needle plate during the entering and exiting operation; and a thread cutting device disposed at the other side of the side of the needle in the parallel direction to cut the looper thread and the needle thread after sewing And a plurality of needle loops captured by the bending needle in and out by the looper thread held by the looper, thereby forming a loop of the double loop stitching on the cloth, and comprising: a moving means for the cut end portion of the looper thread, which is cut by the thread cutting device and connected to the front end portion of the looper when the looper is at the substantially inward and outward end after the sewing is completed The cut end portion of the looper line that is in the free state is moved toward the downstream side in the sewing traveling direction of the looper and along the posture in the substantially sewing traveling direction; the looper holding means can hold And releasing the vicinity of the front end portion of the cut end portion of the looper thread that has been moved to the downstream side in the sewing traveling direction; the looper thread holding member having the looper thread guide portion and the hook thread holding groove portion, and the looper guide portion In order to form an empty loop or form a stitch on the next fabric, the needle and the looper are at least half-rotated, thereby guiding a portion of the looper line held near the front end portion to the side of the plurality of stitches a set position in a range in which the adjacent ends of the needles are connected to each other in the direction, wherein the looper holding groove portion holds the middle portion of the looper line guided by the guide portion to the set position in a direction other than the traveling direction of the movement removing and sewing The state of being blocked; And the control means is configured to rotate the needle and the looper in a state where the middle portion of the looper thread is held by the looper holding member, and the needle is in the vicinity of the top dead center and a bending operation of the bending needle from a position near the entrance end to a position of the rotation operation between the needle reaching the vicinity of the bottom dead center and the bending needle reaching the vicinity of the retracting end, and releasing the holding by the looper holding means; After the control operation of the control means, the cut end portion of the looper thread is held in a free state, and the next fabric is predeterminedly sewn.

Moreover, the double-loop stitching sewing machine according to the fourth aspect of the present invention is a double-loop stitching sewing machine for sewing a circular material, comprising: a needle board for folding back and closing the edge portion of the circular fabric to the back side of the fabric. The overlapping cloth portion is disposed and guided for the conveyance toward the predetermined sewing traveling direction; the plurality of needles are arranged side by side in a direction substantially orthogonal to the sewing traveling direction to hold the needle thread and move up and down; the curved needle holds the looper thread And advancing and retracting between a side portion of the parallel direction of the plurality of needles and the other side portion in a direction substantially orthogonal to the sewing traveling direction, and capturing the needle under the needle plate during the entering and exiting movement a plurality of stitching rings formed; and a tangential device disposed at the other side of the parallel direction of the needle to cut the looper thread and the needle thread after the sewing; and the looper thread held by the looper is The plurality of needle loops captured by the bending needle entering and exiting are looped, thereby forming a double loop stitching step on the entire circumference of the overlapping cloth portion of the circular fabric. The present invention includes a traveling means for the cut end portion of the looper thread, which is cut by the thread cutting device and connected to the thread hole at the tip end portion of the looper when the looper is at the substantially inward and outward end after the sewing is completed. The cut end portion of the meandering thread is moved so as to be on the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; the looper holding means is capable of holding and releasing the movement to a front end portion of the cut end portion of the looper line on the downstream side of the sewing traveling direction a looper holding member having a looper guide portion and a looper thread holding groove portion, wherein the looper guide portion causes the needle and the looper to perform at least a half rotation operation in order to form an empty loop or form a stitch in the next fabric. Thereby, the portion of the looper line held in the vicinity of the front end portion is guided to a set position within a range in which the vicinity of each of the plurality of needles in the parallel direction of the plurality of needles is connected, and the looper holding groove portion is The guiding portion is guided to a state in which the middle portion of the looper line at the set position is kept from being moved away from the movement direction except for the movement direction; and the control means is controlled in such a manner that the middle portion of the looper line is The needle and the looper are rotated in a state in which the looper holding member is held, and the needle is near the top dead center and the looper is near the entrance end to the vicinity of the bottom dead center and the looper The set operation position within the range of the rotational motion between the positions near the retracted end is released by the above-described looper holding means Hold; after the control operation of the control means, the cut end portion of said looper thread holding the free state is carried out a predetermined sewing the fabric to the next.

Further, in the sewing method of the cloth according to the fifth aspect of the present invention, the fabric is conveyed in a predetermined sewing direction along the upper surface of the needle plate, and the plurality of needles arranged in a direction substantially perpendicular to the sewing traveling direction are moved up and down. And forming a plurality of needle loops under the needle plate, and advancing and retracting between a side portion of the side of the plurality of needles and the other side portion in a direction orthogonal to the sewing traveling direction The plurality of needle loops are captured by the bending needles, and the plurality of needle loops captured by the looper thread are looped by the looper thread, thereby forming a double stitch stitching step of the plurality of stitches on the cloth. A first step of cutting a tangent device disposed on the other side portion of the juxtaposed direction of the needle and connecting it to the end of the looper when the looper is at the substantially inward and outward end after the sewing is completed. The cut end portion of the looper thread of the line hole becomes a free state; the second step, which bends the free state The cut end portion of the needle thread is moved so as to be on the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; and in the third step, it is moved to the downstream side of the sewing traveling direction. In the vicinity of the front end portion of the cut end portion of the looper thread, and in the fourth step, the needle and the looper are at least half-rotated in order to form an empty loop or form a stitch in the next fabric, and then the front end portion is near The middle portion of the held looper thread is guided to the position between the needles in the parallel direction of the plurality of needles, and is held in a position other than the direction in which the middle portion of the looper thread is guided from the guide direction. And a fifth step, after the fourth step, after the needle and the looper are rotated, the holding of the vicinity of the front end portion of the cut end portion of the looper is released Forming a double loop stitching step; along with the fifth step, performing a process of sewing the cut end portion of the looper thread into the double loop stitching step.

Further, the double-loop stitch sewing machine according to the sixth aspect of the present invention includes a needle plate that is provided for the cloth and guides conveyance in a traveling direction toward a predetermined sewing direction; the plurality of needles are oriented substantially orthogonal to the traveling direction of the sewing. Parallelly arranged to hold the needle thread and move up and down; the looper, which holds the looper thread, can span between one side of the side of the plurality of stitches and the other side and in a direction substantially orthogonal to the direction of travel of the stitching Performing a forward and backward movement, and capturing a plurality of needle thread loops formed under the needle plate during the entering and exiting operation; and a thread cutting device disposed at the other side of the side of the needle in the parallel direction to cut the looper thread and the needle thread after sewing And the plurality of needle loops captured by the movement of the looper are looped by the looper thread held by the looper, thereby forming a loop of the double loop stitching on the cloth, characterized in that a moving means for the cut end portion of the looper thread, which is cut by the thread cutting device and connected to the front end of the looper when the looper is at the substantially inward and out end after the sewing is completed The line hole of the part becomes a free state The cut end portion of the looper thread is moved so as to be on the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; the looper thread holding means can hold and release the grip to the above sewing a vicinity of a front end portion of the cut end portion of the looper line on the downstream side in the traveling direction; a hook thread holding member having a looper guide portion and a hook thread holding groove portion, wherein the looper guide portion is formed to form an empty loop or Forming a stitch in the cloth, and causing the needle and the looper to perform at least a half-rotation operation, thereby guiding a portion of the looper line held near the front end portion to a position between the stitches at both ends of the plurality of stitches in the parallel direction; The looper thread holding groove portion holds a portion of the looper line guided to the position by the guide portion in a state in which it is prevented from being moved away from the moving direction of the movement and the sewing direction, and a control means that controls the manner of The needle and the looper are rotated in a state where the middle portion of the looper thread is held by the looper thread holding member Thereafter, the stitching by the looper wire holding means is released, and the stitching step of forming the double loop stitching on the next cloth is performed; and the cut end portion of the looper thread is sewn into the control operation accompanying the control means to form the next step. The treatment of the double loop stitching of the cloth.

According to the sewing method and the double loop sewing machine of the first to fourth inventions having the above-described features, after the predetermined sewing operation (after the sewing is completed), the other side of the plurality of needles is arranged in the side (the lower side) The outer position of the needle position close to the right side is cut by the thread cutting device and connected to the wire hole at the front end portion of the looper to be the cut end portion of the looper line in a free state to the downstream side of the sewing direction of the looper and along The posture of the sewing direction of the sewing direction is substantially moved, and the vicinity of the front end portion of the cut end portion of the moving looper thread is maintained at the shifting position, and then used to form an empty loop or a needle for forming a needle step and a looper for the next fabric. Semi-rotating action The middle portion of the looper line held by the front end portion is guided to a set position within a range connecting the adjacent portions of the needles in the parallel direction of the plurality of needles, and the middle portion of the looper line is formed at the guide position. Keeping in a state of preventing the detachment from moving in a direction other than the traveling direction of the sewing, in the following rotation of the needle and the looper, the needle is from the vicinity of the top dead center to the position near the bottom dead center and the looper is self-in and out. The setting operation position in the range of the rotation operation between the position near the end and the position reaching the vicinity of the retraction end releases the vicinity of the end portion of the cut end portion of the hook line, and thereafter, the hook line is cut off. The end portion is kept in a free state, and the next cloth is sewed in a predetermined state, so that the holding of the vicinity of the front end portion of the cut end portion of the looper thread is released at the stage before the sewing operation of the next cloth, thereby The length of the cut end portion of the looper thread, that is, the line of the looper thread is shortened. Further, by gradually moving the cut end portion of the looper line from the guide holding position in the sewing traveling direction, the looper end can be fixed to the left and right ends of the needle in the parallel direction when the predetermined sewing operation is performed. The largest of the range of the vicinity of the needle thread portion is connected to the outer side of the needle thread portion, that is, the position within the approximate width of the stitch formed by the next sewing operation. Thereby, the remaining length of the cut end portion of the looper thread cut by the thread cutting device can be shortened as much as possible, and the wire end can be fixed at a position within the approximate width of the stitch step, so that even if used as a looper thread, In the case of cutting the looper thread which is dispersed into a plurality of types of filaments, it is also possible to suppress the case where the end of the cut end portion of the looper thread is largely penetrated to the needle with the plurality of filaments dispersed in the plurality of filaments The outer side of the step is extended, or it is lifted from the surface of the cloth, and the appearance is deteriorated to cause poor decoration.

Further, according to the sewing method and the double loop sewing machine of the cloth according to the fifth and sixth aspects of the present invention, the other side of the plurality of stitches is arranged after the predetermined sewing operation (after the stitching is completed). (the outer position of the needle drop position near the right side) is mounted by the tangent a cut end portion of the hook thread that is cut and connected to the wire hole at the front end portion of the looper in a free state is moved toward the downstream side in the sewing traveling direction of the looper and in a posture that is substantially in the traveling direction of the sewing, and is made The cut end portion of the moving looper thread is held at the shifting position near the front end portion, and then used to form an empty loop or a needle for forming a needle step and a looper at the next cloth to perform at least a half rotation operation, thereby maintaining the front end portion The middle portion of the looper thread is guided to a position between the stitches at both ends of the plurality of stitches in the parallel direction, and the middle portion of the looper thread is held at a position to prevent the detachment from moving in a direction other than the travel direction of the sewing. After the rotation of the needle and the looper, the holding of the vicinity of the front end portion of the cut end portion of the looper thread is released, and the stitching of the double loop stitch is formed on the next fabric, thereby cutting the looper thread. The entire end portion of the broken end portion is sequentially detached from the guide holding position between the two ends of the needle in the sewing traveling direction. Thereby, even if the looper thread is cut into a predetermined length state by the thread cutting device, the cut end portion of the looper thread can be guided to the formation portion of the double loop stitching step at the time of the sewing operation of the next fabric, and the stitching can be surely performed. The process of entering the stitching step can eliminate the fact that the portion near the front end of the cut end portion of the looper wire protrudes in a whisker shape toward the outer side of the stitch step.

As described above, according to the first to sixth inventions, the sewing operator does not need to perform the cutting of the cut end portion of the looper thread, for example, using scissors or the like, after the sewing is completed or before the sewing of the next fabric is started. In addition to the cumbersome and labor-intensive manual work, the sewing work efficiency can be improved, the work load on the sewing machine can be reduced, and the freedom of the hand of the sewing operator can be increased, so that the operability of the cloth is improved. In addition, it is also possible to improve the quality of the sewing, and it is also possible to sew the fabric due to damage such as scissors, so that the appearance and quality of the sewn product can be improved.

In particular, as in the second invention and the fourth invention, the circular cloth is used as When the sewing object is stitched at the bottom of the crease, the stitching start portion and the stitching end portion are slightly overlapped and stitched, but at this time, after the stitching from the beginning portion of the stitching is extended to the outside in a whisker shape, the stitching is performed. The cut end portion of the looper thread of a predetermined length is guided to a set position within a range in which the adjacent ends of the needles in the parallel direction are connected, and is sequentially moved away from the guide holding position in the sewing traveling direction. Therefore, the cut end portion of the looper thread can be treated so as to have a shorter length and the end of the thread is fixed within the approximate width of the stitch step, so that it is not necessary to temporarily interrupt the sewing operation during the sewing process, using scissors or the like. The cutting end portion of the needle thread is cut short, and then the suturing operation is started, and the suturing operation is performed in a complicated and time-consuming operation. The overlapping stitching of the stitching end portion can be performed, and the circular cloth can be continuously performed at once. The stitching at the bottom of the crease seam can eliminate the time loss for the treatment of the looper thread, so that the curling of the circular fabric can be performed very efficiently.

In the sewing method of the fabric of the first invention and the second invention, it is preferable that the sewing start portion is formed in a predetermined sewing state in which the cut end portion of the looper thread is kept in a free state after the fifth step. The conveyance amount of the cloth is set to be smaller than the conveyance amount of the cloth at the time of normal sewing.

In this case, since the cut end portion of the looper thread is kept in a free state and the amount of conveyance of the cloth at the time of the predetermined sewing is smaller than usual, the front end of the cut end portion of the looper thread is located at both ends of the parallel direction. In the stitching of the form which is complicatedly intertwined, the residual end of the thread can be restrained from projecting to the right and left of the needle thread portion, and the appearance can be further improved.

Further, in the sewing method of the fabric of the first invention and the second aspect of the invention, preferably, in the fourth step, the portion of the looper thread held near the front end portion is guided to the plurality of needles. Position between the needles at both ends of the parallel direction, and maintain the above-mentioned looper line The movement from the position where it is guided is prevented from being moved except for the direction of travel.

In this case, the middle portion of the looper line is held in the vicinity of the end portion of the looper line, and the position in which the sewing travel direction is sequentially released is sequentially between the needles in the parallel direction, so that the shorter looper thread can be used. The treatment is performed in such a manner that the wire end is fixedly fixed to the position within the width of the stitch formed by the next sewing operation and the projection to the outer side of the stitch is hardly generated.

Further, in the double loop sewing machine according to the third aspect of the present invention, preferably, the moving means of the cut end portion of the hook thread is an air ejection nozzle between the air ejection nozzle and the looper holding means. A looper guide member having a cut end portion that is blown by the air ejected from the air ejecting nozzle to a substantially horizontal posture along a substantially sewing traveling direction is provided on one side. The path through which it passes.

In this case, the cut end portion of the looper thread is blown by the air ejected from the nozzle, so that it can be surely moved to the downstream side in the traveling direction of the looper of the looper regardless of the type of the line, and the air is ejected. Since the nozzle is disposed at a fixed position, the movable portion is not required, so that the structure is simple and the space is small, and it is suitable for being disposed inside the sewing machine bottom plate. Further, by guiding the cut end portion of the looper thread blown by the air through the passage of the looper guide member, the cut end portion of the easily threaded looper wire can be surely corrected to be roughly sewn as planned. The horizontal posture of the direction of travel.

Further, the double-loop stitching sewing machine according to the third invention and the fourth invention may be a double-needle-type horizontal tubular double-loop stitching sewing machine which is applied to the bottom of the crease of the end of the circular fabric, or may be a double-needle pattern. Platform type double loop stitching sewing machine.

Further, in the double loop sewing machine according to the sixth aspect of the invention, it is preferable that the looper guide portion of the hook thread holding member is formed such that the entry and exit end side of the looper is at the highest Or a lowest position and toward the inclined edge of the hook line holding groove portion gradually becoming lower or higher, and guiding the middle portion of the hook line to the middle end of the needle in a state of sliding contact with the inclined edge position.

In this case, by slidingly contacting the intermediate portion of the looper line that is pulled with the looper backward movement and the inclined edge of the looper guide member, the intermediate portion can be surely guided to the two without error. The position between the end pins.

1a, 1b‧‧ needle

2‧‧‧ needle board

3‧‧‧bend needle

3a‧‧‧ front hole

4‧‧‧Thread cutting device

50‧‧‧Air ejection nozzle (moving means for the cut end of the looper)

60‧‧‧Open and closed type clamping mechanism (looper retention means)

70‧‧‧looper guide member

71‧‧‧ pathway

80‧‧‧Hose thread holding member

81‧‧‧Slanted edge (bending line guide)

82‧‧‧bending needle retaining groove

NTa, NTb‧‧ needles

LT‧‧‧bending needle thread

LT1‧‧‧ highlights the cut needle line

LT2‧‧‧ looper end section

Mid section of the LT2a‧‧‧ looper line

The end of the LTe‧‧‧ curved needle thread

M‧‧‧ Double loop sewing machine

W‧‧‧Sewing fabric (circular fabric)

A‧‧‧ Double-loop stitching

H‧‧‧Sewing direction

Fig. 1 is a perspective view showing a state in which the upper surface portion of the bottom plate portion of the sewing machine is removed from the entire double-needle-type rectangular tubular double-loop sewing machine according to the embodiment of the present invention.

Fig. 2 is a perspective view showing the main part of the state in which the arm of the sewing machine is cut off by the horizontal double-loop stitch sewing machine of the same double needle type.

Fig. 3 is a view showing a state in which the tangential device of the horizontal double-loop sewing machine of the same double-needle type is retracted to the retracted position, (A) is a plan view of the main part, and (B) is along the line III-III of Fig. 3(A). Longitudinal section.

Fig. 4 shows a state in which the upper tangential device moves in and out to the in-and-out position and the movable cutter is driven to the leftmost position, (A) is a plan view of the main portion, and (B) is along the IV-IV of Fig. 4(A). Longitudinal section of the line.

Fig. 5 is an exploded perspective view showing the configuration of a reciprocating drive moving mechanism in the same upper thread cutting device.

Fig. 6 is a view showing an example of a stitching structure of a double loop stitching viewed from the back side of a sewn fabric.

Fig. 7 is a view showing another example of the stitching structure of the double loop stitching from the back side of the sewn fabric.

Fig. 8 is a view showing still another example of the stitching structure of the double loop stitching from the back side of the sewn fabric.

Fig. 9 is a view showing still another example of the stitch structure of the double loop stitching from the back side of the sewn fabric.

Fig. 10 is an external perspective view showing a state in which the hem of the crease of the circular fabric is sewn at the first sewing method of the present invention.

FIG. 11 is an enlarged perspective view showing a main part of a state in which the first step of the first sewing method is performed and the state immediately after the completion of the sewing.

FIG. 12 is an enlarged perspective view showing a main portion in a state in which the hooking end portion is moved to the downstream side in the sewing traveling direction of the looper in the state of the second step of the first sewing method.

FIG. 13 is an enlarged perspective view showing a main portion in a state in which the end portion of the looper end portion of the looper end portion which is moved to the downstream side in the sewing traveling direction of the looper is nipped in the state of the third step of the first sewing method.

Fig. 14 is a view showing a state of the third step which is the same as that of Fig. 13, (A) is an enlarged perspective view of a main portion viewed from the sewing traveling direction, and (B) is a view as seen in the direction of the arrow of the line V-V in Fig. 14(A).

Fig. 15 is a view showing a state in which the fourth step of the first sewing method is performed, and the middle portion of the hook line cutting end portion is guided between the left and right needles, and (A) is an enlarged perspective view of the main portion viewed from the sewing traveling direction, ( B) is a view as seen in the direction of the arrow of the line VI-VI of Fig. 15(A).

Fig. 16 shows a state in which the middle portion of the meander line cutting end portion is guided to the left and right needles and enters the holding groove portion after the fourth step of the first sewing method, and (A) is observed from the sewing traveling direction. An enlarged perspective view of the main part, (B) is a view as seen in the direction of the arrow of the line VII-VII of Fig. 16(A).

Fig. 17 is a view showing the state of the fifth step of the first sewing method and the case where the looper enters and exits to the vicinity of the needle drop (A) is an enlarged perspective view of a main portion viewed from the direction in which the sewing is made, and (B) is a view as viewed in the direction of the arrow VIII-VIII of Fig. 17(A).

Fig. 18 is a perspective view showing a main part in a state in which the sewing machine performs one rotation operation from the state of Fig. 17 and the looper reaches the vicinity of the entrance and exit ends.

Fig. 19 is a perspective view showing a state in which the sewing machine further performs one rotation operation from the state of Fig. 18, and the looper reaches the vicinity of the entrance and exit end, and the main portion of the stitch step at this time.

Fig. 20 is a perspective view showing a state in which the sewing machine further performs one rotation operation from the state of Fig. 19, and the looper reaches the vicinity of the entrance and exit end, and the main portion of the stitch step at this time.

Fig. 21 is a perspective view showing a state in which the sewing machine further performs one rotation operation from the state of Fig. 18, and the bending needle reaches the vicinity of the entrance and exit end and the main portion of the stitching at this time.

Fig. 22 is a perspective view showing a state in which the sewing machine further performs one rotation operation from the state of Fig. 21 and the looper reaches the vicinity of the entrance and exit end, and the main part of the stitch step at this time.

Fig. 23 is a view showing the structure of the stitch step of the double loop stitching by the second sewing method from the back side of the sewn fabric.

Fig. 24 is a view showing a state in which the tangential device of the conventional double-loop sewing machine is moved in and out as a whole, and (A) is a plan view of a main portion, and (B) is a longitudinal sectional view taken along line IX-IX of Fig. 21.

25(a) to (f) are perspective views showing the main parts of the tangential operation of the tangential device of the conventional double-loop sewing machine.

Fig. 26 is a view showing an example of a conventional double-loop stitching structure as seen from the back side of a sewn fabric.

Hereinafter, embodiments of the present invention will be described based on the drawings. Furthermore, in this In the embodiment, the same components as those of the conventional double-loop stitching sewing machine will be described with the same reference numerals.

1 is a perspective view showing a state in which the upper surface portion of the bottom plate portion of the sewing machine is removed from the whole of the double-needle type double-loop stitch sewing machine of the present invention, and FIG. 2 is a cut-off sewing machine arm of the double-needle-shaped horizontal double-loop sewing machine. A perspective view of the main part of the state.

The double-needle-type horizontal tubular double-loop sewing machine M-series sewing machine arm portion 21 and the sewing machine bottom plate portion 22 extend substantially parallel to each other from the upper portion and the lower portion of the sewing machine body 20 toward the left side. In the inside of the sewing machine arm portion 21, the sewing machine main shaft and the needles that reciprocate up and down the two needles 1a and 1b (see FIGS. 3 and 4) arranged side by side in the direction substantially perpendicular to the sewing traveling direction are inserted. The drive mechanism, the presser foot drive mechanism that reciprocates the presser foot (not shown) up and down, or the power transmission mechanism of the drive mechanisms, etc., are well known, and thus the description thereof is omitted.

A needle plate 2 having a needle drop groove portion for forming a needle drop position is fixed to an upper surface portion of the sewing machine bottom plate portion 22, and a looper 3 and a tangent line are inserted into the sewing machine bottom plate portion 22 at a lower portion of the needle plate 2 In the device 4, the reciprocating drive moving mechanism 9, and the like, the looper 3 holds the looper thread LT to advance and retreat in a horizontal direction substantially orthogonal to the upper and lower reciprocating paths of the needles 1a and 1b, and the reciprocating drive mechanism 9 causes the thread trimming device The blade edge portion 6e of the fixed cutter 6 of 4 is placed close to the needle plate 2 and the looper 3 as shown in Figs. 4(A) and (B), and is abutted against the collision member 34 described below. The entrance and exit position P1 on the left front side of the stopper member 33 is reciprocally driven to move between the retracted position P2 which is closer to the right rear side than the above-described entry and exit position P1 as shown in FIGS. 3(A) and (B), and is in the tangential device. 4, in the state of moving to the above-described entry and exit position P1, only the outer movable position of the following movable cutter 5 and the needle drop position near the one side (right side) and the other side (left) The outer side of the side) is linearly reciprocally driven to move in the X-Y direction.

The double-needle stitch sewing machine M having the above-described configuration is looped by the needle loops NTa' and NTb' formed under the needle plate 2 by the looper wires LT held by the looper 3, as shown in the figure. 6 to FIG. 9 , a double loop stitching step A having a predetermined length is formed on the sewing fabric W.

The tangential device 4 is configured such that the tangential device 4 can extend over the retracted position P1 that is closer to the needle plate 2 and the looper 3 than the needle plate 2 and the looper 3, and the retracted position P2 that is closer to the right rearward than the entry and exit position P1. The reciprocating drive moves between. Further, the thread cutting device 4 includes a movable cutter 5 for thread cutting, which protrudes to the left and right needle thread portions NTa1, NTb1 and the curved portion on the back side of the sewing fabric W after the completion of the predetermined sewing operation, that is, when the stitching is completed. The needle thread portion LT1 is cut; and the fixed cutter 6 does not enter the range in the lower reciprocating path above the right needle 1b of the left and right needles 1a, 1b at the above-described entrance and exit position P1 and is closest to the needle drop position. The blade portion 6e is disposed. Further, the clip-on needle thread member 7 made of a leaf spring provided in the conventional double-loop stitch sewing machine shown in Fig. 24 and the tension assist spring 8 for adjusting the grip force of the clip-on needle thread member 7 are provided, but these are provided. The clip threading member 7 and the tension assist spring 8 are moved to a position where the cut end portion LT2 of the looper thread LT1 after cutting is not clamped. Therefore, after the sewing is completed, the cut end portion LT2 of the looper thread LT1 cut by the thread cutting device 4 is connected to the thread hole 3a at the front end portion of the looper 3 to be in a free state and sag as shown in FIG. Further, the clip threading member 7 and the thread catching assist spring 8 are moved to a position where the hook thread cutting end portion LT2 is not held, but in order to make the hook thread cut sure, the movable cutter can be moved to maintain the movable cutter 5 is elastically pressurized to a position where the cutter 6 is fixed.

The movable cutter 5 is composed of a strip-shaped plate material that is long in the left-right direction, and is configured The side edge portion of the movable cutter 5 formed of the longer strip-shaped plate material near the front end is formed in the same manner as the conventional movable cutter 5 from the other side of the needle drop position. When the position is moved toward the outer position close to one side, the looper wire catching portion 10 that is hooked and caught by the looper thread portion LT1 on the back side of the above-described sewing fabric W is moved, and is more than the looper thread catching portion 10 The side edge portion of the base end of the movable cutter 5 is formed to be protruded when the movable cutter 5 is moved from the outer position closer to the other side from the needle drop position toward the outer position near the one side. The needle thread catching portion 11 that is hooked and caught by the left and right needle thread portions NTa1 and NTb1 on the back side of the sewing fabric W in this order is located on the side closer to the needle drop position from the above-described entrance and exit position P1 (right side). When the external position is moved to the outer position closer to the other side (left side), the right and left needle thread portions NTb1 and NTa1 captured by the needle thread catching portion 11 and the looper portion captured by the looper line capturing portion 10 are caused. LT1 moves to compare The outer position of the near side (right side) of the needle drop position is closer to the other side (right side), and the needle thread catching portion 11 and the looper catching portion 10 and the edge portion 6e of the fixed cutter 6 are provided. Sliding contact, and cutting them separately.

The reciprocating drive moving mechanism 9 is configured as shown in Figs. 3(A) and (B), Figs. 4(A), (B) and Fig. 5, and the reciprocating drive moving mechanism 9 causes the tangential device 4 to straddle the above-mentioned entrance and exit position P1. Reciprocating drive movement is performed between the retracted position P2 and the outer position and proximity of the movable cutter 5 to the side closer to the needle drop position (right side) in a state where the thread cutting device 4 is moved to the above-described entrance and exit position P1. The outer side of the other side (left side) is linearly reciprocally driven to move in the XY direction.

That is, the movable cutter 5 is fixed to the movable cutter table 24 via the screw 23 on the lower surface of the right end portion thereof. A U-shaped portion is formed at a substantially central portion in the longitudinal direction (left-right direction) of the movable cutter table 24 The slit portion 25 is formed with a pair of long and left pair of slits 26a and 26b along the longitudinal direction of the movable cutter table 24 at the left and right positions across the slit portion 25.

The fixed cutter 6 is disposed on the upper surface of the movable cutter 5, and the cutter table guide 27 is disposed on the lower surface of the right end portion of the fixed cutter 6, and the fixed cutter 6 and the cutter guide 14 are passed through The screw 28 is fixed to the left end of the fixed cutter table 29. The movable cutter table 24 is inserted into the upper surface side of the pair of right and left links 40a, 40b by the bolt 48 inserted through the back surface (lower surface) of the fixed cutter table 29 and the upper surface side of the pair of left and right links 40a, 40b. The flanged cylindrical nuts 31a and 31b at one end are sandwiched by the flanged cylindrical nuts 31a and 31b to allow the one end of the pair of left and right links 40a and 40b to be rotated. It is possible to slide and move in the length range of the pair of right and left slits 26a and 26b in the movable cutter table 24.

The other end portions of the pair of right and left links 40a and 40b are inserted into the flanged sleeves 41a and 41b which are inserted from the upper surface side and allow the rotation of the other end portions of the pair of left and right links 40a and 40b. The screws 42a and 42b are screwed to the apparatus mounting base 30, whereby the movable cutter table 24 and the fixed cutter table 29 are reciprocated in the left-right direction with the swing movement of the pair of left and right links 40a and 40b. Supported by the device mounting station 30.

Further, the flanged sleeve 41b on the right side of the flanged sleeves 41a, 41b is formed in an eccentric cam shape so that the distance between the ends of the right side link 40b can be changed to the left side. The sleeve 41a with the flange of the link 40a is a fine adjustment of the position of the movable cutter 5 of the fulcrum tangential device 4 at the above-described entrance and exit position P1 with respect to the movement start point of the needle drop portion and the looper 3 in the sewing traveling direction.

The fixed cutter table 29 is formed at a position below the left link 40a of the pair of left and right links 40a and 40b, and is screwed to the device mounting base 30 and abuts against the stopper member. Collision member 34 of 33.

Further, in the rear portion of the center portion in the longitudinal direction of the fixed cutter table 29, an engagement projection 36 that abuts and separates from the projection 35 projecting rearward from the left end of the movable cutter table 24 is formed. When the engaging projection 36 abuts against the projection 35, the movable cutter table 24 cannot be separately moved to the right direction. Further, the movable cutter table 24 is screwed to the device mounting base 30, and is elastically applied to the left side in the left direction together with the fixed cutter table 29 via a spring 37 whose one end is elastically contacted with the right end surface of the collision member 34. Pressure.

In the apparatus mounting base 30, a groove 46 into which the fixed cutter table 29 is slidably fitted in the left-right direction is formed, and is fixed to the sewing machine bottom plate portion 22 via a plurality of screws 47 disposed around the periphery. Further, a drive lever 45 is attached to the apparatus mounting base 30, and the drive lever 45 is pivotally connected to a front end portion of the piston 58 of the cylinder (not shown) via a step screw 43, and the shaft 44 can be attached to the apparatus mounting base 30. The center drives the swing in the direction of the arrow ab. The tapered circular portion 45a at the front end of the drive rod 45 is engaged with a U-shaped cutout portion 25 formed at a substantially central portion of the movable cutter table 24.

According to the reciprocating drive moving mechanism 9 configured as described above, as shown in Figs. 3(A) and (B), when the drive lever 45 is driven to swing in the b direction by the extension of the piston 58, the thread trimming device 4 is fixed by the above. The collision member 34 of the cutter table 29 is elastically biased to the left by the spring 37. Therefore, the movable cutter table 24 is moved to the right to abut against the engagement projection 36, thereby resisting the elastic force of the spring 37. The pressure is moved to the right, and the cylindrical nuts 31a, 31b of the pair of left and right links 40a, 40b are moved to the leftmost state in the pair of left and right slits 26a, 26b, and the collision member 34 of the cutter table 29 is fixed. The left end surface is separated from the stopper member 33. In this state, the thread cutting device 4 is located at the retracted position P2, and stands by in an inclined posture that does not hinder the movement of the looper 3.

Then, as shown in Figs. 4(A) and (B), the drive rod 45 is driven to swing in the a direction by the contraction of the piston 58, and the elastic pressing force of the spring 37 interacts to cause the collision of the fixed cutter table 29. Member 34 moves to the left. In the state in which the engaging projection 36 abuts against the projection 35, the tangential device 4 reduces the inclination angle of the tilting posture by the swing of the pair of left and right links 40a and 40b, and moves to the left until the fixed cutting is performed. The left end surface of the collision member 34 of the turret 29 abuts against the stopper member 33. Thereby, the thread cutting device 4 moves to the entrance/exit position P1, and it is a posture orthogonal to the sewing traveling direction.

When the piston 58 is further contracted from this state and the drive lever 45 is driven to swing in the a direction, the engaging projection 36 of the fixed cutter table 29 is held in a state where the fixed cutter table 29 remains in the above-described entrance and exit position P1. Separate from the projection 35 of the movable cutter table 24, the movable cutter table 24 is moved in the left direction (X direction) by the needle drop position of the needle plate 2. That is, only the movable cutter 5 fixed to the movable cutter table 24 is moved leftward between the needle plate 2 and the looper 3 (forward movement). At this time, the movable cutter table 24 and the fixed cutter table 29 are supported by the device mounting table 30 in a state in which the pair of right and left links 40a and 40b are reciprocated in the left-right direction, so that the movable cutter 5 is movable. It is controlled so as to linearly move by the pair of left and right links 40a, 40b.

Then, the drive rod 45 is driven to swing in the b direction by the extension of the piston 58, and the movable cutter 5 is moved to the right (Y direction) from the leftmost position, and is retracted at the entrance and exit position P1. (Repeat movement) to the lower part of the fixed cutter 6 in standby standby. When the piston 58 is further contracted from this state, the thread cutting device 4 moves backward to the retracted position P2 shown in Figs. 3(A) and (B).

In addition to the above-described configuration and device, the double loop seam of the present embodiment The machine M further includes an air ejection nozzle 50 disposed at a position upstream of the sewing traveling direction H of the curved needle 3, and an opening and closing type clamping mechanism 60 disposed downstream of the sewing traveling direction H of the curved needle 3. a side opposite to the air ejection nozzle 50; the hook thread guiding member 70 is disposed above the advancing and retracting operation path of the curved needle 3 and between the air ejection nozzle 50 and the opening and closing type clamping mechanism 60; a looper thread holding member 80 disposed at a downstream side of the looping traveling direction H of the looper 3 and closer to a retreating side of the looper 3 than the opening and closing type gripping mechanism 60; and a control means for controlling the opening and closing The opening and closing operation of the type wire clamping mechanism 60.

Among the above-described constituent elements, the air ejection nozzle 50, the opening and closing type clamping mechanism 60, the hook thread guiding member 70, and the hook thread holding member 80 are housed inside the sewing machine bottom plate portion 22. However, in order to avoid complication due to overlapping of the constituent elements and the respective constituent portions of the reciprocating drive moving mechanism 9, etc., the constituent elements are omitted in FIGS. 1 and 2. The control means is incorporated in a control unit (not shown) for controlling the overall operation of the double loop sewing machine.

The air ejection nozzle 50 functions as a looper shifting means, and when the looper 3 is at the substantially inward and outward end after the sewing is completed, the needle is cut by the thread cutting device 4 and connected to the front end of the looper 3 as shown in FIG. The cut end portion LT2 (described as the looper cut end portion LT2 in the following description) of the looper portion LT1 which is in the free state and which is in the free state is ejected with air, thereby being as shown in FIG. The looper portion cut end portion LT2 is blown by the upper portion of the looper 3 toward the downstream side of the looping travel direction H of the looper 3 to be moved.

The opening and closing type wire clamping mechanism 60 is configured to be openable and closable by a fixing clip 61 and a slide piece 62 that moves far and near with respect to the fixed clip 61 via a cylinder (not shown). and, The opening and closing type thread clamping mechanism 60 functions as a hook thread temporary holding means. As shown in FIG. 13, the closing operation of the fixed clip 61 and the slide piece 62 is temporarily performed by the nozzle 50. The air is nipped in the vicinity of the front end portion of the above-mentioned hook thread cutting end portion LT2 which is blown to the downstream side in the sewing traveling direction H of the looper 3, and is opened by the above-described fixing clip 61 and the above-described slide 62 The action is to release the grip near the end portion of the looper end portion LT2.

Further, the means for temporarily holding the looper thread is not limited to the above-described opening and closing type gripping mechanism 60, and is configured to be capable of forcibly closing the looper end portion LT2 by the opening and closing operation of the fixed clip 61 and the slide 62 Clamp and release the grip. For example, it is also possible to form a looper end portion LT2 by the elastic force of a spring or the like by fixing the clip 61 and the slider 62, and the looper cut end portion LT2 is pulled When the stitching of the sewing start portion of the next fabric is reached, the elastic force against the spring or the like is released from the gripping position to release the grip.

The looper guide member 70 has a passage 71 which passes through the above-mentioned looper end which is blown over the upper portion of the looper 3 by the air ejected from the nozzle 50 as shown in FIG. The portion TL2 is corrected to pass along a substantially horizontal posture that substantially sews the traveling direction H. The upper surface plate portion 72 of the passage 71 in the looper guide member 70 is formed such that it can be visually confirmed whether or not the above-described hook thread cut end portion LT2 is corrected to pass through the passage 71 and substantially horizontally in the substantially sewing direction H. Transparent window. Further, a curved line sliding groove 73 is formed in the right wall portion 74 of the passage 71 in the looper guide member 70, and the hook line sliding groove 73 faces the looper line LT2a in the middle of the looper end portion LT2. When the holding member 80 is guided, the vicinity of the front end portion held by the opening and closing type thread clamping mechanism 60 is slidably guided toward the downstream side in the sewing traveling direction H (see FIGS. 14(B) to 17(B)}.

The looper thread holding member 80 includes a looper thread guide portion 81 that performs a half-rotation operation of the needles 1a, 1b and the looper 3 in order to form an empty loop or form a stitch in the next fabric, thereby being opened by the above-described opening and closing clip The middle portion LT2a of the looper cut end portion LT2 near the tip end portion of the thread mechanism 60 is guided to a substantially central position between the left and right needles 1a and 1b as shown in Figs. 15(A) and 16(A); And the looper thread holding groove portion 82 which guides the middle portion LT2a of the looper thread cutting end portion LT2 substantially at the center position between the left and right needles 1a and 1b by the guide portion 81 as shown in Figs. 16 to 19 The state in which the detachment movement in the other direction than the sewing traveling direction H is prevented is prevented.

More specifically, the hooker thread holding member 80 is formed of a plate-like member having a substantially V-shape as a whole when viewed from the sewing traveling direction H, and the V-shaped opening portion is formed as a middle portion of the looper line LT2a. The receiving guide 83 is received. The looper guide portion 81 is formed by a slanting edge that gradually becomes lower toward the entrance of the looper holding groove portion 82 along the upper side of the receiving guide portion 83 at the position where the entry and exit end of the looper 3 is at the highest position. In the state in which the middle portion LT2a of the meandering thread cut end portion LT2 is in sliding contact with the guide portion 81 formed by the inclined edge, it is guided to a substantially central position between the left and right needles 1a and 1b, and is dropped. And held in the above-mentioned looper wire holding groove portion 82.

The looper holding member 80 is fixed to the needle guard holder before (the downstream) side in the sewing traveling direction H in the pair of needle guards (not shown) before the sewing traveling direction H provided in the sewing machine bottom plate portion 22 90, in order to prevent the above-mentioned left and right needles 1a, 1b from shaking. In the state in which the middle portion LT2a of the hook thread cutting end portion LT2 is held by the hook thread holding groove portion 82 of the hook thread holding member 80, the needles 1a, 1b and the looper 3 are provided via the above-described control means. When the substantially one rotation operation is performed, the opening and closing type thread clamping mechanism 60 is released. After the gripping, the looper end portion LT2 is fixed to the next fabric portion with its front end (line end) by performing a control action in such a manner that the double loop stitching step A is formed for the next fabric portion. The state of the position within the approximate width of the stitch A of the double loop stitching is processed.

Next, a circular object such as a crease portion for a T-shirt, which is a first sewing method of a double-needle type double-barrel double-loop sewing machine M of the double-needle type which is configured as described above, will be described with reference to FIG. 10 to FIG. The sewing action of the bottom seam of the crease of the fabric W.

First, as shown in FIG. 10, the overlapping fabric portion in which the fabric edge portion is folded back toward the back side of the fabric in the crease portion of the circular fabric W is placed on the needle board 2, and thereafter, the circle is formed. The overlapping cloth portion of the cloth W is conveyed toward the predetermined sewing traveling direction H, and the rotation of the sewing machine M is started. The lifting and lowering operation of the left and right needles 1a, 1b, the advancement and retreat operation of the looper 3, and the transfer of the circular fabric W by the rotation of the sewing machine M are carried out via Figs. 25(a) to (e). In the same step, the crease bottom stitching of the stitch A of the double loop stitching is formed on the entire circumference of the overlapping cloth portion of the circular fabric W.

After the sewing (sewing of the bottom of the crease) is completed, the thread cutting portions NTa1, NTb1 and the looper portion LT1 are cut by the thread cutting device 4. At this time, the cutting position is a position that is separated from the needle drop position by not entering the upper and lower reciprocating paths of the needles 1a and 1b, and is located closer to the right side than the right needle 1b, so that the left and right needles are cut off. The cut ends LT2 of the portions NTa1, NTb1 and the looper portion LT1 have a predetermined line residual length.

After the above cutting, the cut left and right needle thread portions NTa1, NTb1 are pulled up to the upper portion within the width of the stitch A, and the stitch A is formed at the appropriate stitching start portion of the next cloth. On the other hand, the looper cut end portion LT2 which is cut and left to have a predetermined length is in this state as shown in Fig. 26, and is larger toward the outer side of the stitch A. Extend.

Therefore, in the first sewing method of the present embodiment, in order to fix the above-described looper end portion LT2 with a short line residual length, it is preferably fixed to the double loop stitch formed at the beginning of the stitching of the next cloth. The processing is performed in such a manner that the position within the approximate width of the stitching is performed, and the step operation as described below is performed.

First step: First, the cut end of the looper end portion LT2 is not clamped to the movable cutter at a position where the front end portion is separated from the needle drop position and is located closer to the right side than the right needle 1b. 5, and between the clip threading member, as shown in Fig. 11, the front end portion is connected to the position of the left needle 1a in a free state connected to the thread hole 3a at the front end portion of the looper 3 at the substantially the entrance end. Sag to the left separation position.

In the second step, the air ejection nozzle 50 is ejected from the air ejection nozzle 50 toward the hook line cutting end portion LT2 in a state where the fixing clip 61 and the slider 62 of the opening and closing type thread clamping mechanism 60 are opened. As shown in FIG. 12, the looper thread cut end portion LT2 is blown by the upper portion of the looper 3 toward the downstream side of the looping travel direction H of the looper 3, and is moved. At this time, the looper wire cutting end portion LT2 which is blown over the upper portion of the looper 3 by the discharge air from the nozzle 50 is guided to the passage 71 of the looper guide member 70 and is caused to Passing through the passage 71, the looper cut end portion LT2 is corrected to a substantially horizontal posture along the substantially sewing travel direction H.

In the third step, the air is ejected from the nozzle 50, and at the same time, the sliding piece 62 of the opening and closing type wire clamping mechanism 60 is slid toward the side of the fixing piece 61, and the two pieces 62 and 61 are closed. As shown in Fig. 13 and Fig. 14, the vicinity of the front end portion of the meander line cut end portion LT2 is sandwiched.

Step 4: In this state, the needles 1a, 1b and the looper 3 are half-rotated by the action of the sewing machine M in order to form an empty loop or form a stitch in the next fabric, as shown in Fig. 15 (A). In the vicinity of the tip end portion, the middle portion LT2a of the looper thread LT1 held by the open/close type gripping mechanism 60 is received by the receiving guide portion 83 of the looper holding member 80 as the looper 3 moves backward. Then, it is guided toward a substantially central position between the left and right needles 1a and 1b in a state of being in sliding contact with the guide portion 81 formed of the inclined edge. At the same time, the vicinity of the front end portion sandwiched by the opening and closing type thread clamping mechanism 60 is slidably guided in the looper sliding groove 73 toward the downstream side in the sewing traveling direction H as shown in Fig. 15(B). By continuing this state, the meander line intermediate portion LT2a guided to the substantially central position between the left and right needles 1a and 1b is dropped and held in the hook line holding groove portion 82 as shown in Fig. 16(A). Further, as shown in Fig. 16(B), the portion near the front end portion held by the opening and closing type thread clamping mechanism 60 is moved to the innermost end portion of the hook line sliding groove 73 (the most downstream portion of the sewing traveling direction H). .

Step 5: Then, when the sewing machine M is actuated to rotate the left and right needles 1a, 1b and the looper 3, and the looper 3 reaches the vicinity of the needle drop (near the middle portion of the left and right needles 1a and 1b), As shown in Fig. 17, the looper 3 pushes up the looper portion of the thread hole 3a close to the front end portion of the looper 3 upward and upward on the rear side of the needles 1a, 1b. Then, the left and right needles 1a, 1b and the looper 3 are rotated by the next action of the sewing machine M, and the looper 3 reaches the position near the entrance and exit end before the entrance and exit ends until the reverse of the entrance and exit ends. As shown in FIG. 18, the slide piece 62 of the open/close type gripping mechanism 60 is slid to the side separated from the fixed piece 61 to rotate the two pieces 62, as shown in FIG. The opening operation is performed to release the grip near the end portion of the looper end portion LT2.

After the fifth step, by making the left and right needles 1a, 1b and the curved needle 3 The rotation operation is performed, and the predetermined sewing for forming the double loop stitching step A for the next cloth is performed. At this time, since the looper-cut end portion LT2 is released from the gripping stage before the predetermined sewing operation, the looper-cut end portion LT2 is used as a looper line formed by the stitching start stitching, and the length thereof is The line of the looper thread becomes shorter. Further, the meander line cutting end portion LT2 is detached from the meander line holding groove portion 82 of the hook thread holding member 80 to be in a free state, and the shorter portion is after the sewing operation of the first needle. The line end LTe of the looper cut end portion LT2 is located within the width of the stitch A of the stitch start portion as shown in FIG.

Thereafter, the predetermined sewing of the next fabric is continued. After the second stitch and subsequent sewing operations, the shorter looper end portion LT2 is also located at the line end LTe as shown in FIG. The state within the width of the stitch A of the stitching start portion.

The stitch step A of the double loop stitching for sewing the next cloth by the operations of the first step to the fifth step and the fifth step is a configuration shown in Figs. 6 to 9 . In the stitch A of any of the configurations shown in FIGS. 6 to 9, the length of the looper end portion LT2, that is, the line of the looper line is short, so that the line end LTe is not large. Extend to the right or left of the stitch A.

The needle step A of the structural form shown in Figs. 6 to 9 is observed in detail, and as a result, the line end LTe of the looper end portion LT2 is extended to the right or left as shown in Fig. 7 or Fig. 8. In the case of the outer side of the needle thread portion, the amount of protrusion is limited to a very small extent, so that it can be extended to the outside of the left and right needle thread portions without accompanying the looper thread cutting end portion LT2 or lifted from the cloth surface. The visual appearance is deteriorated to the extent that the final processing is performed.

In particular, at least one to three stitches at the start of sewing in a predetermined sewing state in which the looper cut end portion LT2 is in a free state after the fifth step is performed. The conveyance amount of the cloth W is set to be smaller than the conveyance amount of the cloth at the time of normal sewing, whereby the distance between the left and right needle thread portions becomes small, and the looper cut end portion LT2 becomes the stitch A of the next fabric. Since the looper thread or the needle thread is pressed, the thread end LTe of the looper thread can be suppressed from extending to the left and right of the needle thread portion, thereby further improving the appearance.

As described above, according to the first sewing method, the remaining length of the looper cut end portion LT2 cut by the thread cutting device 4 can be shortened as much as possible, and the thread end thereof can be fixed at a position within the approximate width of the stitch A. Therefore, even when a looper thread which is dispersed into a plurality of filaments of a plurality of filaments is used as the looper thread, it is possible to suppress the case where the looper end portion LT2 is dispersed in a plurality of filaments. The front end portion (line end) protrudes to a large extent toward the outer side of the stitch A, or is lifted from the cloth surface, and the appearance is deteriorated to cause a decorative defect.

Therefore, according to the first sewing method, the sewing operator does not need to perform the cumbersome and labor-intensive process of cutting the cut end portion LT2 of the looper thread, for example, using scissors or the like, before the sewing is completed or before the sewing of the next fabric is started. In this case, it is possible to improve the sewing work efficiency, and to reduce the work load on the sewing machine, and the degree of freedom of the hand of the sewing operator is increased, so that the operability of the cloth is also improved and the sewing can be improved. In addition, since the fabric W is not sewn by the scissors or the like, the appearance and quality of the sewn product can be improved.

In the case where the circular material W is stitched to the bottom of the crease as the object to be sewn as in the present embodiment, the stitching start portion and the stitching end portion are slightly overlapped, but at this time, at the beginning of the stitching The one needle can be fixed to the stitching end portion LT2 of the lower side of the cloth by the operation of the first to fifth steps, and is fixed to the stitching start portion of the next cloth. The position within the width, so that it is not necessary to temporarily interrupt the sewing operation during the sewing process, and the cutting process is short by holding the scissors, etc., and then the sewing brake is started. Overlap stitching is done. Therefore, the circular material cloth W which can be overlapped and stitched continuously with the end portion of the stitching can be sutured at the bottom of the crease of the entire circumference, and the portion of the looper end portion LT2 for the longer remaining can be eliminated. The processing time is lost, and the sewing work efficiency is further improved, and the decorative condition with better form and appearance can be obtained.

With reference to Fig. 21 and Fig. 22, the crease portion of the T-shirt is formed in the same manner as the first sewing method in the form of the second sewing method using the double-needle-shaped double-loop double-stitch sewing machine M of the above-described embodiment. The sewing operation of the bottom seam of the crease of the circular fabric W will be described.

The first to fourth steps in the second sewing method are the same as those in the first sewing method as shown in FIGS. 11 to 20, and therefore detailed descriptions of the first to fourth steps are omitted, and only the fifth is performed. The step operation will be described later.

Step 5: After the fourth step, when the sewing machine M is actuated, the left and right needles 1a, 1b and the looper 3 are rotated, and the looper 3 reaches the vicinity of the needle drop (near the middle portion of the left and right needles 1a, 1b) Then, the looper 3 pushes up the looper portion of the thread hole 3a close to the front end portion of the looper 3 upward and upward on the back side of the needles 1a, 1b. When the left and right needles 1a, 1b and the looper 3 are rotated by the next sewing machine M, the left and right needles 1a, 1b and the looper 3 are rotated, and the looper 3 reaches the state shown in Fig. 20 near the entrance and exit end. Further, by performing one rotation operation to form the double stitch stitching step A on the next cloth, as shown in Fig. 21, the looper line LT is positioned above the stitch A. That is, if the stitch A is viewed from the back, the hook line LT is located in the stitch A.

Thereafter, the slide piece 62 of the open/close type gripping mechanism 60 is slid to the side separated from the fixed piece 61, and the two pieces 62 and 61 are opened, thereby clamping the vicinity of the front end portion of the hook line cut end portion LT2. Release, to continue the double-loop suture needle for the next fabric The formation of step A.

By continuing the stitching formation by the fifth step, that is, the sewing of the next cloth portion, the looper end portion LT2 from which the gripping has been released is maintained and the middle portion LT2a is dropped and held by the looper wire holding member. In the state in which the looper wire 80 holds the groove portion 82, the looper thread cut end portion LT2 sequentially moves out in the sewing traveling direction H in a state of passing through the looper holding groove portion 82 with the progress of the sewing. Thereby, the looper cut end portion LT2 is subjected to a process of sewing into the stitch step A of the double loop stitching across the entire length thereof as shown in FIG.

As described above, when the crease bottom of the double-loop stitching stitch A of the entire circumference of the overlapping cloth portion of the circular fabric W is stitched, the stitching start portion and the stitching end portion are slightly overlapped and stitched, and at this time, When the stitching of the first stitch is started by stitching, a predetermined length remains on the back surface of the cloth W, and if it is placed in this state, the hooking wire cutting end portion LT2 can be performed by performing the above-described first to fifth steps. The entire length is sewn into the stitching of the stitching start portion of the next fabric portion, and the first to fifth steps are performed by the looper end portion LT2 which protrudes from the stitching step A in a whisker shape. After being in a free state, it is moved to the downstream side of the sewing traveling direction H of the looper 3 and held in the vicinity of the front end portion, and the intermediate portion LT2a is guided to the substantially central portion between the left and right needles 1a and 1b and held. The holding position is sequentially disengaged in the sewing traveling direction H.

Therefore, even in the second sewing method, it is possible to improve the sewing work efficiency without increasing the sewing work efficiency, and the workability of the cloth W is improved, and the sewing quality can be improved. . Further, there is almost no case where the cloth W is damaged by the scissors, and the appearance and quality of the sewn product can be improved.

Furthermore, in the above embodiment, as the hook line cutting end portion LT2 The traveling means for moving to the downstream side of the sewing direction H of the bending needle 3 uses an air ejection nozzle having a simple structure and not occupying a space, and is not limited thereto, and a holding tool for holding the hook thread cutting end portion LT2 may be provided. The hook line cut end portion LT2 is moved by moving the gripping tool to the downstream side of the sewing traveling direction H of the looper 3.

Further, as an operation position for releasing the two pieces 62 and 61 of the opening/closing type thread clamping mechanism 60 and releasing the vicinity of the front end portion of the hook line cutting end portion LT2, the operation position can be set to be reached from the looper 3 The position near the entrance and exit end before the entry and exit end is at any position between the position where the inlet and outlet ends are reversed and then substantially rotated halfway to reach the vicinity of the retraction end, and the operation position is set to be closer to the entry and exit end of the looper 3 The more the nearby position, the shorter the line of the looper line is.

Further, in the above-described embodiment, the hook line holding member 80 is formed of a plate-like member having a substantially V-shape as a whole when viewed from the sewing traveling direction H, and the V-shaped opening portion is formed as a halfway portion of the looper line. The LT 2a receives the guide portion 83, and the guide portion 81 is gradually lowered from the upper side of the receiving guide portion 83 to the upper end of the looper 3 at the entrance end side and toward the entrance of the hook line holding groove portion 82. The above-described case is described, and the above-described case is described as the case where the inclined edge is the reverse gradient, that is, the position where the entrance end side of the looper 3 is at the lowest position and the groove portion 82 is oriented toward the hook line. A slanting edge forming member or the like whose inlet is gradually increased may have a slanting edge that guides the middle portion LT2a of the looper cutting portion LT2 to the left and right needles, and any shape of the plate member may be used. The inclined edge (guide portion) 81 and the hook thread holding groove portion 82 are formed of a wire member.

Further, in the above embodiment, the horizontal cylindrical double-loop stitch sewing machine applied to the double needle type is not limited thereto, and can be applied to a double-needle type double-loop stitch sewing machine, and can also be applied to a plurality of needles of three or more needles. A horizontal cylindrical or platform-shaped double loop stitching sewing machine. its In the case of a sewing machine of a plurality of stitch patterns of three or more, it is preferable to guide the middle portion LT2a of the looper end portion LT2 to the needles at both ends of the parallel direction among the plurality of needles, and it is preferable to hold them. It is guided to the approximate center position of the parallel direction of the plurality of needles and held. Further, when applied to any type of sewing machine, the same effects as those of the above embodiment can be exerted.

1a, 1b‧‧ needle

3‧‧‧bend needle

50‧‧‧Air ejection nozzle (moving means for the cut end of the looper)

70‧‧‧looper guide member

73‧‧‧bending line sliding groove

74‧‧‧Right wall

80‧‧‧Hose thread holding member

81‧‧‧Slanted edge (bending line guide)

82‧‧‧bending needle retaining groove

83‧‧‧ Receiving guide

LT2‧‧‧ looper end section

M‧‧‧ Double loop sewing machine

NTa, NTb‧‧ needles

NTa', NTb'‧‧ needle loop

NTa1, NTb1‧‧‧ Needle Department

Claims (17)

A method for sewing a fabric, wherein the fabric is conveyed in a predetermined sewing direction along a surface of the needle board, and the needle is moved up and down by a plurality of needles arranged side by side in a direction substantially orthogonal to the traveling direction of the sewing. Forming a plurality of stitch loops, and bending the needles by advancing and retracting between one side of the side of the plurality of stitches and the other side and in a direction substantially orthogonal to the direction of travel of the stitching Inserting and capturing the plurality of needle loops, and looping the plurality of needle loops captured by the looper thread held by the looper, thereby forming a double stitch stitching step of the plurality of stitches on the cloth, wherein In the first step, when the looper is positioned at the substantially inward and outward end after the sewing is completed, the thread cutting device disposed on the other side portion of the needle in the side of the needle is cut and connected to the line of the end portion of the looper The cut end portion of the looper of the hole is in a free state; and in the second step, the cut end portion of the looper line in the free state is made to be sewn toward the looper The downstream side of the direction moves along the posture of the substantially continuous traveling direction; and the third step maintains the vicinity of the front end portion of the cut end portion of the looper line that has moved to the downstream side in the sewing traveling direction; In order to form an empty loop or form a stitch in the next fabric, the needle and the looper are at least half-rotated, thereby guiding a portion of the looper line held near the front end portion to the plurality of needles. a set position in a range in which the adjacent ends of the needles in the parallel direction are connected to each other, and is maintained in a state in which the movement of the middle portion of the looper thread from the set position guided thereby is prohibited except for the traveling direction of the sewing; a fifth step of the rotation of the needle and the looper after the fourth step The setting operation position in the range of the rotation motion between the position of the needle from the vicinity of the top dead center and the position of the looper from the vicinity of the entrance end to the vicinity of the bottom dead center and the position where the looper reaches the vicinity of the retraction end is released The cutting end portion of the looper wire is held in the vicinity of the front end portion; and after the fifth step, the cut end portion of the looper thread is held in a free state to perform predetermined sewing. The method of sewing a fabric according to the first aspect of the invention, wherein the conveying amount of the cloth at the beginning of the sewing in the predetermined sewing is performed while the cut end portion of the looper thread is kept in a free state after the fifth step It is less than the amount of cloth that is usually sewn. The method of sewing a fabric according to the first aspect of the invention, wherein, in the fourth step, the middle portion of the looper thread held near the front end portion is guided to the end of the plurality of stitches in the parallel direction The position is maintained in a state in which the movement from the position where the middle portion of the looper thread is guided is not blocked except for the traveling direction of the sewing. A method for sewing a cloth, which is formed by transferring the edge portion of the circular fabric to the back side of the fabric and folding it back along the upper surface of the needle plate in a predetermined sewing direction. a plurality of needles arranged side by side in a direction orthogonal to the direction of travel are moved up and down to form a plurality of needle loops under the needle plate, and by one side and the other side of the side of the plurality of needles And inserting and closing the looper in the direction orthogonal to the sewing traveling direction to capture the plurality of stitch loops, and the plurality of stitch loops captured by the looper held by the looper are sleeved a loop for forming a double loop stitching step on the entire circumference of the overlapping cloth portion of the circular fabric, characterized in that: the first step: when the looper is at the substantially inward and out end after the sewing is completed, a tangential device disposed at the other side of the parallel direction of the needle is cut and connected to the front end portion of the looper The cut end portion of the looper thread of the thread hole is in a free state; and in the second step, the cut end portion of the looper thread in the free state is formed to be downstream of the sewing direction of the looper in the sewing direction, and is substantially sewed In the third step, the method moves to the vicinity of the front end portion of the cut end portion of the looper line on the downstream side of the sewing traveling direction; the fourth step, in order to form an empty loop or a lower portion Forming a stitch in the cloth to cause the needle and the looper to perform at least a half-rotation operation, thereby guiding a portion of the looper line held near the front end portion to each of the stitches in the parallel direction of the plurality of stitches a set position within a range of the connection between the adjacent portions, and is maintained in a state in which the movement of the middle portion of the looper thread from the set position guided thereby is prohibited except for the traveling direction of the sewing; and the fifth step, which is continued The needle in the rotation operation of the needle and the looper after the 4th step is from the position near the top dead center and the looper is near the entrance and exit end to the point where the needle reaches the bottom dead center And the set operation position in the range of the rotation operation between the position where the looper reaches the vicinity of the retraction end, and the holding of the vicinity of the end portion of the cut end portion of the looper line is released; after the fifth step, the bend is made The cut end portion of the needle thread is kept in a free state for predetermined sewing. The method for sewing a fabric according to the fourth aspect of the invention, wherein the conveying amount of the cloth at the beginning of the sewing in the predetermined sewing in which the cut end portion of the looper thread is kept in a free state after the fifth step is set It is less than the amount of cloth that is usually sewn. The sewing method of the fabric of claim 4, wherein in the fourth step, the middle portion of the looper thread held near the front end portion is guided to the plurality of needles The position between the needles at both ends of the parallel direction is maintained in a state in which the movement from the position where the middle portion of the looper thread is guided is not blocked except for the traveling direction of the sewing. A double-loop stitching sewing machine comprising: a needle plate for guiding a cloth and guiding the conveyance toward a predetermined sewing traveling direction; and a plurality of needles arranged in parallel in a direction substantially orthogonal to the sewing traveling direction, and maintaining The needle thread moves up and down; the looper maintains the looper thread and can advance and retreat between one side of the side of the plurality of stitches and the other side and in a direction substantially orthogonal to the direction of travel of the stitching. And capturing a plurality of needle thread loops formed under the needle plate during the feeding operation; and tangential device disposed at the other side of the parallel direction of the needle to cut the looper thread and the needle thread after the sewing; The looper thread held by the looper performs a loop on the plurality of stitch loops captured by the looping movement of the looper, thereby forming a double loop stitching step on the cloth, and is characterized in that: the looper is cut a moving means for the broken end portion, which is cut by the tangential device and connected to the front end portion of the curved needle when the curved needle is at the substantially inward and outward end after the sewing is completed The cut end portion of the looper thread in the free state is moved toward the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; the looper thread holding means can be held and released The meander line holding member has a looper guide portion and a looper thread holding groove portion, and the looper guide portion is formed to be empty in the vicinity of the front end portion of the cut end portion of the looper line on the downstream side in the sewing traveling direction. Forming a stitch in the ring or causing the needle and the looper to perform at least a half-rotation operation, thereby guiding the middle portion of the looper thread held near the front end portion to two of the plurality of stitches in the parallel direction a set position in a range in which the end portions of the end pins are connected to each other, wherein the hook thread holding groove portion guides the looper line from the guide portion to the set position The middle portion is maintained in a state in which it is prevented from moving away from the moving direction of the sewing process, and the control means is controlled such that the portion of the looper line is held by the looper holding member, and the above The needle and the looper perform a rotation operation between the needle from the position near the top dead center and the position of the looper near the entrance end to the position where the needle reaches the bottom dead center and the looper reaches the vicinity of the retraction end The set operation position in the range is released by the looper holding means; after the control operation of the control means, the cut end portion of the looper thread is held in a free state, and the next fabric is predeterminedly sewn. The double-loop stitching sewing machine according to claim 7, wherein the moving means of the cut end portion of the looper thread is an air ejection nozzle, and the looper guiding member is disposed between the air ejection nozzle and the looper thread holding means The looper guide member has a passage for correcting the cut end portion of the looper thread blown by the air ejected from the air discharge nozzle to pass through a substantially horizontal posture substantially in the traveling direction of the sewing. The double-loop stitching sewing machine according to the seventh aspect of the invention, wherein the looper thread holding member is disposed such that the looper guide portion is located between the stitches at both ends of the plurality of stitches in the parallel direction. A double-loop stitching sewing machine for sewing a circular material fabric, comprising: a needle plate for arranging the overlapping fabric portion in which the edge portion of the circular fabric is folded back to the back side of the fabric; Guided in the direction of travel; a plurality of needles arranged in parallel in a direction substantially perpendicular to the direction of travel of the sewing, holding the needle thread and moving up and down; the looper, which holds the looper thread, can span the juxtaposition of the plurality of needles Advancing and retreating between one side of the direction and the other side and in a direction substantially orthogonal to the direction of travel of the sewing, and capturing during entering and exiting a plurality of needle thread loops formed by the needle under the needle plate; and a thread cutting device disposed at the other side of the needle in the parallel direction to cut the looper thread and the needle thread after the sewing; the bend held by the looper The needle thread is looped on the plurality of needle loops captured by the movement of the looper, thereby forming a double loop stitching step on the entire circumference of the overlapping cloth portion of the circular fabric, and is characterized in that: a moving means for the cut end portion of the looper thread, wherein the looper is cut by the thread cutting device and is connected to the thread hole at the tip end portion of the looper to be in a free state after the sewing is completed. The cut end portion is moved so as to be on the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; the looper thread holding means can hold and release the grip to the above-mentioned sewing traveling direction a vicinity of a front end portion of the cut end portion of the looper thread on the downstream side; a looper thread holding member having a looper thread guide portion and a looper thread holding groove portion, The needle thread guiding portion guides the needle and the looper at least in a half-rotation operation in order to form an empty loop or form a stitch in the next fabric, thereby guiding a portion of the looper thread held near the front end portion to the plurality of needles a set position in a range in which the adjacent ends of the needles in the parallel direction are connected to each other, wherein the looper holding groove portion holds the middle portion of the looper line guided to the set position by the guide portion to be moved away from the movement a state in which the direction is blocked, and a control means that controls the needle and the looper to rotate in a state in which the middle portion of the looper thread is held by the looper holding member The setting operation position in the range of the rotation operation between the position near the top dead center and the position of the looper from the vicinity of the entrance end to the vicinity of the bottom dead center and the position where the looper reaches the vicinity of the retraction end is released from the above The maintenance of the looper holding means; After the control operation of the control means, the cut end portion of the looper thread is held in a free state, and the next fabric is predeterminedly sewn. The double-loop stitch sewing machine for sewing a circular material fabric according to claim 10, wherein the moving means of the cut end portion of the looper thread is an air ejection nozzle between the air ejection nozzle and the looper holding means A looper guide member having a cut end portion that is blown by the air ejected from the air ejecting nozzle to a substantially horizontal posture along a substantially sewing traveling direction is provided on one side. The path through which it passes. The double loop sewing machine according to claim 10, wherein the looper thread holding member is disposed such that the looper guide portion is located between the stitches at both ends of the plurality of stitches in the parallel direction. A double-loop stitching sewing machine according to the seventh or tenth aspect of the patent application, wherein the sewing machine to be used is a double-needle-type horizontal cylindrical double-loop sewing machine. A method for sewing a fabric, wherein the fabric is conveyed in a predetermined sewing direction along a surface of the needle board, and the needle is moved up and down by a plurality of needles arranged side by side in a direction substantially orthogonal to the traveling direction of the sewing. a plurality of needle loops are formed under the loop, and the looper can be moved forward and backward by a direction between one side of the side of the plurality of stitches and the other side and in a direction orthogonal to the direction of travel of the stitching And capturing the plurality of needle loops, and looping the plurality of needle loops captured by the looper thread held by the looper, thereby forming a double stitch stitching step of the plurality of stitches on the cloth, wherein In the first step, when the looper is positioned at the substantially inward and outward end after the sewing is completed, the thread cutting device disposed at the other side portion of the needle in the side of the needle is cut and connected to the thread hole of the tip end portion of the looper. The cut end portion of the looper thread is in a free state; In the second step, the cut end portion of the looper line in the free state is moved toward the downstream side in the sewing traveling direction of the looper and in a posture substantially parallel to the traveling direction; the third step is to maintain Moving to the vicinity of the front end portion of the cut end portion of the looper line on the downstream side of the sewing traveling direction; and in the fourth step, the needle and the looper are at least formed in order to form an empty loop or form a stitch in the next fabric After the half-rotation operation, the portion of the looper line held in the vicinity of the front end portion is guided to a position between the needles in the parallel direction of the plurality of needles, and is held in the middle of the looper line. a state in which the movement is prevented except for the sewing traveling direction; and a fifth step, after the fourth step, after the rotation of the needle and the looper is performed, the cut end portion of the looper is released a step of forming a double loop stitching on the next cloth while holding the vicinity of the front end; along with the fifth step, sewing the cut end portion of the looper thread into the double loop stitch Stitch in the process. A double-loop stitching sewing machine comprising: a needle plate for guiding a cloth and guiding conveyance toward a predetermined sewing traveling direction; and a plurality of needles arranged in parallel in a direction substantially orthogonal to the sewing traveling direction to hold the needle thread and Moving up and down; the looper, which holds the looper thread, can advance and retreat between one side of the side of the plurality of stitches in the side of the plurality of stitches and the other side and in a direction orthogonal to the direction of travel of the stitching, and enters and exits During operation, the plurality of needle loops formed under the needle plate are captured; and a thread cutting device is disposed on the other side of the parallel direction of the needle to cut the looper thread and the needle thread after the sewing; Keep the looper thread pair by the above bend The plurality of needle loops captured by the needle insertion and closing operation are looped to form a loop of the double loop stitching on the cloth, and the method includes a moving means of the cut end portion of the looper thread, after the sewing is completed When the looper is positioned at the substantially inward and outward end, the bent end of the looper is cut by the thread cutting device and connected to the threaded hole at the tip end portion of the looper, and the cut end portion of the looper thread is in a free running direction. The downstream side moves along a posture that substantially sews the traveling direction; the looper holding means holds and releases the vicinity of the front end portion of the cut end portion of the looper line that has been moved to the downstream side of the sewing traveling direction a looper thread holding member having a looper thread guiding portion and a looper thread holding groove portion, wherein the looper thread guiding portion causes the needle and the looper to perform at least a half rotation after forming a loop for forming an empty loop or forming a stitch on the next fabric And guiding a portion of the looper line held near the front end portion to a position between the stitches at both ends of the plurality of stitches in the parallel direction, The looper thread holding groove portion holds a portion of the looper line guided to the position by the guide portion in a state in which it is prevented from being moved away from the movement direction of the movement and the sewing direction; and a control means that is controlled in such a manner that a state in which the middle portion of the looper thread is held by the looper holding member, and after the needle and the looper are rotated, the needle loop holding means is released, and the loop of the double loop stitching is formed on the next fabric; The process of sewing the cut end portion of the looper thread into the stitching step of the double loop stitching of the next fabric in accordance with the control operation of the above control means is performed. The double-loop stitching sewing machine of claim 15, wherein the moving means of the cut end portion of the looper thread is an air ejection nozzle, and the looper guiding member is disposed between the air ejection nozzle and the looper thread holding means The looper guide member has a side to be self-sufficient The cut end portion of the looper line of the air blown by the air discharge nozzle is corrected to a passage that passes through the substantially horizontal posture in the direction in which the sewing is substantially performed. The double-loop stitching sewing machine according to the fifteenth aspect of the invention, wherein the looper thread guiding portion of the looper thread holding member is configured such that the inlet and outlet end sides of the looper are at the highest or lowest position and are oriented toward the hook line retaining groove portion. The inclined edge of the entrance gradually becomes lower or higher, and the portion of the meandering thread is guided to the position between the two ends of the needle in a state of being in sliding contact with the inclined edge.