TW201400666A - Cloth sewing method and double-thread chain stitch sewing machine - Google Patents

Abstract

The present invention provides a fabric sewing method and double-thread chain stitch sewing machine, the cloth is fed in the moving direction of sewing along the upper surface of the throat plate, and, at the same time, the two needles retaining the suture and moving vertically form the suture loop under the throat plate. Also, by moving forward the looper which can perform the backward and forward movement in the direction approximately orthogonal to the up-and-down moving path of the needle, the suture loop is catched. The catched suture loop is wound by the looper thread retained by the looper, thus a pin foot of double-thread chain stitches is formed on the cloth. At this moment, the convex suture end portion on the cloth surface when the first needle is sewed at the beginning of sewing is moved and guided in the pressed state by pressing and moving the guiding member toward the downstream side in the moving direction of sewing, thereby sewing the suture end portion into the pin foot of double-thread chain stitches. Therefore, the present sewing method saves the effort to cut the suture end portion protruded from the cloth surface when the first needle is sewed at the beginning of sewing. At the same time, the efficiency of sewing operation and the operational property of cloth are increased, and the damage of cloth is prevented.

Description

Cloth sewing method and double loop sewing machine

The present invention relates to, for example, a double loop sewing machine represented by a horizontal cylinder, such as a T-shirt or an underwear, which is used to suture the front and back sheets to prevent the end of the complete fabric which is processed into a loop shape. A method of sewing a fabric such as a hem of a hem, and a double loop sewing machine used in the sewing.

For example, the double-stitch sewing machine is described as an example of a slanting edge under the complete fabric, and the sewing portion of the complete fabric (the portion of the fabric that folds the end edge toward the back side of the fabric) along the needle plate The upper surface is fed in a predetermined sewing traveling direction, and the needle thread is formed under the needle plate by at least one needle that holds the needle thread and moves up and down, and is substantially orthogonal to the movement path above and below the needle. The thread hook is further captured in the direction of the forward and backward movement, and the captured needle thread is looped with the other thread by the thread hook held by the hook, thereby sewing the cloth. Form a double loop stitch.

In the sewing of the fabric forming the stitches of the double loop stitch as described above, as shown in FIG. 10, the first stitch of the sewing start is performed by the needle 1 passing through the fabric W from above the fabric W and moving below the fabric W. At the time, the front end portion of the needle thread NT protrudes on the surface Wf of the cloth W. As a result, as shown in Fig. 11, the quality is poor, that is, the stitch end portion NTa is protruded and remains in one of the hem circumferences of the T-shirt or the like after the hem of the hem is completed, so that the value of the sewn product is lowered.

In the conventional double-stitch sewing machine, the needle thread end portion NTa which is projected on the surface Wf of the cloth W by the sewing of the sewing first stitch is not mechanically and automatically cut off. s installation. Therefore, for example, as described in Japanese Patent No. 4061424, the needle thread end portion NTa which is projected by the sewing machine operator on the surface of the cloth W is manually cut off by hand.

Therefore, in the prior art, the manual cutting process for cutting the needle thread end portion NTa protruding from the surface Wf of the cloth W by the scissors requires at least several seconds for the skilled operator, which in turn causes the sewing operation to be performed. Reduced efficiency. Further, since the degree of freedom of the operator's hand is lowered by holding the scissors, the operability of the cloth is deteriorated, and there is a problem that the cloth is easily damaged by the operation method of the scissors.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for sewing a cloth and a double loop sewing machine which protrudes and remains on the surface of the cloth by sewing the first stitch of the sewing. The processing of the needle end portion can be labor-saving without requiring labor, and the efficiency of the sewing operation and the operability of the cloth can be improved and the fabric can be prevented from being damaged.

In order to achieve the above object, the sewing method of the fabric according to the first aspect of the invention is characterized in that the fabric is fed in the predetermined sewing traveling direction along the upper surface of the needle plate, and at least one needle is held by the needle thread and moved up and down. Forming a needle thread 下 under the needle plate, and capturing the needle thread 之前 before the thread hook capable of performing the advance and retreat operation in a direction substantially orthogonal to the upward movement path of the needle, the captured needle thread 圏a thread hook line held by the thread hook is looped, thereby forming a double loop stitch on the cloth; the cloth sewing method is characterized in that the first needle of the sewing start is sewn on the surface of the cloth The needle end portion that protrudes upward is guided in a state of being pressed against the downstream side in the sewing traveling direction during the sewing operation after the second stitch, whereby the stitch end portion is sewn into the stitch of the double loop stitch. .

Moreover, the sewing method of the cloth according to the second aspect of the present invention is a method of sewing a complete fabric, in which a folded fabric portion is formed by folding an end edge portion of a complete fabric toward a back side of a fabric. Dividing a needle thread 下 under the needle plate by feeding at least one needle that holds the needle thread and moving up and down along the upper surface of the needle plate in a predetermined sewing direction, and by The needle thread 进而 is further captured before the thread hook that performs the advance and retreat operation in the direction in which the needle moves in a direction substantially orthogonal to the upper and lower movement paths, and the captured needle thread 打 is looped by the thread hook line held by the thread hook, thereby a stitch of the double loop stitch is formed on the entire circumference of the overlapping cloth portion of the complete cloth; the sewing method of the cloth is characterized in that the stitching of the first stitch of the sewing is protruded on the surface of the laminated fabric portion The needle thread end portion is guided in a state of being pressed against the downstream side in the sewing traveling direction during the sewing operation after the second stitch, thereby performing the process of sewing the stitch end portion into the stitch of the double loop stitch.

Further, the double-annular sewing machine according to the third aspect of the present invention includes: a needle plate that mounts the cloth and guides the cloth to feed in a predetermined sewing traveling direction; at least one needle that holds the needle thread and moves up and down; and a thread hook Keeping the wire hook line and performing the advancing and retracting action in a direction substantially orthogonal to the upper and lower movement paths of the needle, and capturing the needle thread formed by the needle under the needle plate during the forward movement; and, by the above The needle thread 捕捉 captured by the thread hook before the action of the thread hook is looped by the thread hook line held by the thread hook, thereby forming a double loop stitch on the cloth; the double loop stitch sewing machine is characterized by a needle thread dumping movement guiding member on the lower surface or the upper surface of the needle plate, which is located closer to the upstream side of the sewing traveling direction than the needle above when the sewing start first stitch is sewn, and When the sewing operation is performed after the second stitch, the movement is moved to the downstream side of the upper and lower movement paths of the needle closer to the sewing traveling direction, thereby projecting the first needle of the sewing start on the surface of the cloth. a needle end portion that moves in a collapsed state toward a downstream side of the sewing traveling direction; and an actuator that forcibly moves the needle thread dumping movement guide member closer to the sewing traveling direction than the needle upper and lower movement path The position of the upstream side and the position of the downstream side.

Further, the double-annular sewing machine according to the fourth aspect of the invention is used for a sewer of a complete fabric, comprising: a needle plate on which the end edge portion of the entire fabric is folded toward the back side of the fabric Forming the overlapping cloth portion and guiding the overlapping fabric portion to feed in a predetermined sewing traveling direction; at least one needle holding the needle thread and moving up and down; and a thread hook holding the thread hook line and capable of The forward and backward movement is performed in a direction in which the upper and lower movement paths of the needle are substantially orthogonal, and the needle thread formed by the needle under the needle plate is captured during the forward movement; and the needle thread 捕捉 captured by the forward movement of the thread hook is performed And performing a loop by using a thread hook line held by the hook, thereby forming a double loop stitch on the entire circumference of the overlapping cloth portion of the complete cloth; the double loop sewing machine is characterized by: needle thread dumping a moving guiding member on the lower surface or the upper surface of the needle plate, which is located closer to the upstream side of the sewing traveling direction than the needle above when the sewing first stitch is sewn, and is on the second needle In the subsequent sewing operation, the movement moves to a downstream side of the upper and lower movement paths of the needle closer to the sewing traveling direction, whereby the sewing first stitch is sewn on the surface of the overlapping cloth portion. The protruding needle end portion is guided to move in a collapsed state toward the downstream side in the sewing traveling direction; and an actuator forcibly moving the needle thread dumping movement guide member to be closer to the sewing travel than the needle upper and lower moving path The position on the upstream side of the direction and the position on the downstream side.

According to the sewing method and the double loop sewing machine of the first to fourth inventions having the above-described features, the needle end portion which protrudes on the surface of the cloth at the time of sewing the first stitch is formed. In the sewing operation after the second stitching, the downstream side of the sewing traveling direction is guided by the push-down state, and the needle end portion of the overturned moving guide is sewn into the stitch of the double loop stitch, whereby the operator It is not necessary to take the time to manually cut the needle thread end portion which is projected on the surface of the cloth by sewing the sewing of the first stitch, so that labor saving can be achieved, and the manual cutting can be eliminated. The loss of time leads to an increase in the efficiency of the sewing operation. Moreover, since the operator does not need to hold the scissors, the degree of freedom of the hand is increased, so that the operability of the cloth is improved, and the quality of the sewing product can be improved. Moreover, the situation in which the fabric is damaged by the scissors is almost eliminated, and the effect of suppressing the reduction in the value of the sewn product is exhibited.

In particular, in the case of the hem of the hem, the sling start portion and the end portion of the sew are slightly overlapped when the sling is sewed with the complete fabric as the object of the second invention and the fourth invention. The needle thread end portion which is sewn on the surface of the cloth by the sewing of the stitching start stitching is guided by the sewing operation after the second stitching, and is guided by the downstream side in the sewing traveling direction, and is sewn into the double loop stitch. Since the processing in the stitches is performed, and the sewing operation is temporarily interrupted in the middle of sewing, the hand-held scissors cuts the needle thread end portion and then the sewing operation is started, and the sewing operation may be performed, and the overlapping sewing portion may be included. The hem hem seam is continuously applied to the entire circumference of the entire fabric at one time, thereby exhibiting an effect of eliminating the time loss for the wire processing and further improving the sewing work efficiency.

In the sewing method of the cloth according to the first aspect of the invention and the second aspect of the invention, it is preferable that the needle thread end portion which is projected on the surface of the cloth when the first stitch is started to be stitched is formed with a plurality of stitches forming the stitch. The process of sewing the stitches of the double loop stitch in parallel or substantially parallel.

In this case, the stitching portion that is sewn to the back side of the cloth is sewn into the stitches of the double loop stitch in parallel or substantially parallel with the plurality of stitches forming the stitches, so that even when viewed from the back side of the cloth The stitching of the stitches is also very small, so that the quality of the seams with better appearance can be obtained.

Further, in the double-stitch sewing machine according to the third aspect of the invention, it is preferable that the needle threading movement guiding member is disposed before the sewing traveling direction provided on the lower surface or the upper surface of the needle plate. a strip-shaped member that is slidably supported in the sewing traveling direction along the lower surface or the upper surface of the needle plate, and a pair of up-and-down direction through-hole portions and a needle thread over-pressure portion are formed; The pair of up-and-down direction through-hole portions are slidably moved closer to the upstream side in the sewing traveling direction than the needle upper-lower moving path, and are slidably moved closer to the sewing direction than the needle upper-lower moving path. When the downstream side of the direction is in contact with the needle drop portion of the needle plate and the cloth feeding tooth outlet groove, the needle thread crushing portion is located between the pair of through hole portions and is upstream from the sewing traveling direction Position When moving to the position on the downstream side, it abuts against the needle end portion on the surface of the cloth, and the needle end portion is pressed against the downstream side in the sewing traveling direction.

In this case, the needle-like tilting movement guiding member may be constituted by the strip-shaped member which is long in the traveling direction of the sewing, and the guide member may be provided in the vicinity of the front and rear ends in the traveling direction by sewing on the lower surface or the upper surface of the needle plate. Further, the needle thread tilting movement guide member is stably and smoothly slidably moved in the sewing traveling direction, and is switched to the pair of through hole portions at the sewing start stitching operation and the sewing operation after the second stitching. In either of the state in which the needle drop portion and the cloth feed tooth are in communication with each other, the needle thread tilting movement guide member does not hinder the movement of the cloth feed tooth and the movement of the needle up and down. The state in which the predetermined sewing operation is always performed normally is performed, and on the other hand, the process of sewing the needle thread end portion protruding from the surface of the cloth to the stitch is performed.

Further, in the double-stitch sewing machine according to the third aspect of the invention, it is preferable that the needle threading movement guide member is configured to be in the line of the thread hook line cutting blade mechanism. At the timing when the hook wire holding portion is detached, the needle thread tilting movement guide member is forcibly moved from the position on the upstream side in the sewing traveling direction toward the downstream side.

In this case, the needle end portion that protrudes on the surface of the cloth is guided by the overturned movement when the needle is moved in the overwhelming state toward the downstream side in the sewing traveling direction during the sewing operation after the second stitch. The end portion is easy to sew the end portions of the wire hooks into the stitches together, and the end portions of the wire hooks are prevented from being largely exposed from the stitches toward the side, so that a better appearance of the seam product can be obtained.

Further, in the double loop sewing machine according to the third invention and the fourth aspect of the invention, the sewing machine to be used is preferably a double needle type horizontal cylindrical double loop sewing machine, but a single needle type horizontal cylindrical double ring may be used. Sewing machine, single or double needle double loop sewing machine other than horizontal cylinder, or platform type double loop sewing machine as the target sewing machine.

Further, in the double needle type horizontal cylindrical double loop sewing machine, preferably the above The abutting edge portion of the needle thread overturning portion in the needle threading movement guiding member is formed in a substantially arc shape, and the substantially arc shape follows the center portion from the both sides in the width direction. Gradually located on the upstream side of the sewing travel direction.

In this case, when the needle thread tilting movement guide member slides toward the downstream side of the sewing traveling direction Y and the two needle thread end portions are overwhelmed by the needle thread overturning portion, the two needle thread end portions are substantially arc-shaped. Since the edge portions are abutted and displaced in the direction in which they approach each other, the two needle thread end portions that are overwhelmed can be sewn and processed beautifully and beautifully within the width of the stitches of the double loop stitches.

The other features of the present invention and the effects corresponding thereto can be clearly understood from the embodiments described below.

1‧‧ needle

2‧‧‧ line hook

3‧‧‧ needle board

3a‧‧‧Needle section

3b, 3c‧‧‧ cloth feeding teeth

4‧‧‧Fixed metal parts

5‧‧‧Needle Dumping Mobile Guide

6‧‧‧Cylinder (actuator)

7‧‧‧Sliding guides

8‧‧‧With plate members

8a, 8b‧‧‧through hole

8c‧‧‧Needle overwhelming

8d‧‧‧Stop Department

8e‧‧‧After the edge

9‧‧‧Wire hook cutting mechanism

12‧‧‧ needle stick

13‧‧‧needle mounting tools

A‧‧‧ stitches

B‧‧‧Sewing machine table

C‧‧‧Sewing machine arm

D‧‧‧Sewing machine main body

M‧‧‧Double loop sewing machine

NT‧‧‧Needle

NTa‧‧‧Needle end section

NTb‧‧‧Needle

LT‧‧‧ hook line

LTa‧‧‧ wire hook end section

W‧‧‧Complete fabric

Wf‧‧‧ surface

Y‧‧‧Sewing direction

Fig. 1 is a perspective view showing the overall appearance of a horizontal cylindrical double loop sewing machine according to an embodiment of the present invention.

Fig. 2 is an enlarged perspective view showing the main part of the configuration of the peripheral portion of the needle plate in the same horizontal cylindrical double-loop sewing machine.

Fig. 3 is a perspective view showing the configuration of a needle plate in the same horizontal cylindrical double-loop sewing machine as seen from the back side of the needle plate.

Fig. 4 is a partially broken perspective view showing the main part of the sewing operation state of the sewing start first stitch of the same horizontal cylindrical double-loop sewing machine.

Fig. 5 is a partially broken enlarged perspective view showing a main part of a state immediately after the sewing operation of the sewing first stitch of the same horizontal cylindrical double-loop sewing machine.

6 is a partially broken enlarged perspective view showing a main portion of a state in which the needle threading movement guide member is moved to the downstream side in the sewing traveling direction immediately after the sewing operation of the first stitch of the sewing machine of the same horizontal cylindrical double-loop sewing machine is completed. .

Figure 7 is a view showing the first stitch action for stitch formation in the same horizontal cylindrical double-loop sewing machine. An enlarged perspective view of the main part.

Fig. 8 is an enlarged perspective view showing the main part of the operation of the second round of the stitching situation of the same horizontal cylindrical double-loop sewing machine.

Fig. 9 is a bottom plan view showing the configuration of the stitches of the double loop stitch formed on the back surface of the cloth.

Fig. 10 is a perspective view showing a main part of a state in which a needle end portion which is convexly protruded from the surface of the cloth by sewing the first stitch of the sewing machine.

Fig. 11 is a front view showing a state in which the hem of the complete fabric such as a T-shirt is completed.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a perspective view showing an overall appearance of a horizontal cylindrical double-loop sewing machine according to an embodiment of the present invention, and Fig. 2 is an enlarged perspective view showing a main part of a configuration of a peripheral portion of the needle plate in the horizontal cylindrical double-annular sewing machine, Fig. 3 A perspective view of the configuration of the needle plate in the horizontal cylindrical double loop sewing machine is viewed from the back side of the needle plate.

As shown in Fig. 1, the horizontal cylindrical double-loop sewing machine M of the present embodiment is used for sewing a complete fabric W such as a t-shirt under the T-shirt, and the sewing machine arm portion C and the sewing machine table portion B are from the main body of the sewing machine. The upper and lower positions of D are extended to the left in a substantially parallel shape. As shown in Fig. 2, the horizontal cylindrical double-stitch sewing machine M includes two needles 1 that reciprocate in the up-and-down direction while holding the needle thread NT, and a thread hook 2 that holds the thread hook line LT in relation to the needle 1 advance and retreat operation in the direction in which the upper and lower movement paths are orthogonal; the needle plate 3; the fixed metal member 4 (refer to FIG. 1); the cloth advancement to the teeth and the rear feed tooth (so that the illustration is omitted); the line hook line is cut The cutting blade mechanism 9 is used to cut the wire hook line LT at the end of sewing and hold the wire hook end portion LTa between the cutting wires; and the needle thread below to move the guiding member 5.

The needle 1 is attached to the lower end portion of the needle bar 12 that moves up and down in conjunction with the rotation of the sewing machine main shaft (not shown) in the sewing machine arm portion C via the needle attachment tool 13 to rise and decline.

The hook 2 performs the advance and retreat (leftward and rightward) operations in a direction substantially orthogonal to the upper and lower movement paths of the needle 1 via the action of the hook drive mechanism.

The needle plate 3 is attached to the upper surface of the sewing machine table portion B, and as shown in Fig. 1, the overlapping cloth portion is formed by folding the cloth edge portion toward the back side of the cloth under the entire cloth W. And guiding the superimposed cloth portion of the complete fabric W to feed in a predetermined sewing direction Y.

As shown in FIG. 2 and FIG. 3, the needle plate 3 is formed with a needle drop portion 3a through which the two needles 1 pass, and a cloth feed forward tooth and a feed groove for the cloth feed teeth 3b, 3c. The culling grooves 3b and 3c repeatedly perform the following operations to intermittently and forcibly feed the entire fabric W in the sewing traveling direction Y, which is projected on the needle plate 3 to move in the sewing traveling direction Y, and The detachment into the needle plate 3 is performed in a direction opposite to the sewing traveling direction Y.

The horizontal cylindrical double loop sewing machine sewn the laminated fabric portion of the complete fabric W placed on the needle board 3 by the raising and lowering action of the needle 1 and the forward and backward movement of the thread hook 2. The complete fabric W is pressed against the needle plate 3 by the fixing metal member 4, and the movement of the cloth disposed inside the sewing machine table B is advanced to the teeth and the rear feeding teeth, as indicated by an arrow Y in FIG. The feed movement is performed in the sewing travel direction.

The above-described needle bar 12, the wire hook drive mechanism, and the drive mechanism for the cloth feed teeth are known mechanisms that operate in synchronization with each other by a drive from a sewing machine spindle (not shown). The needle 1 holds the needle thread NT, and passes through the overlapping fabric portion of the complete fabric W to reach below the needle plate 3 during the stop of the feed of the complete fabric W, and then rises to come out over the complete fabric W. . The wire hook 2 holds the wire hook line LT, and advances with the start of the engagement needle 1, and catches the ring NTb of the needle thread NT formed under the needle plate 3. The complete cloth W is fed when the needle 1 is raised. The needle 1 passes through the complete cloth W that has been fed by the feed, and then descends, catches the line hook line LT held by the thread hook 2 in the backward movement, and loops the needle thread 圏NTb by the captured line hook line LT. double The loop sewing machine M repeatedly performs the above actions to form a double loop stitch on the pendulum under the complete cloth W.

In the horizontal cylindrical double-stitch sewing machine M as described above, the lower surface of the needle plate 3 is provided with a needle thread tilting movement guiding member 5 and a cylinder 6 as an actuator, which is forcibly The needle thread dumping movement guide member 5 is moved to a position closer to the upstream end side of the sewing traveling direction Y than the upper end side of the needle 1 and the downstream end side.

As shown in Fig. 3, the needle threading tilting guide member 5 is constituted by a strip-shaped member 8 which is fixed by the lower surface of the needle plate 3 before and after the sewing traveling direction Y. The sliding guides 7, 7 are supported on the lower surface of the needle plate 3 in a reciprocating sliding direction in the sewing traveling direction Y. In the strip-shaped member 8, a pair of through-hole portions 8a, 8b are formed in parallel in the sliding direction, and the pair of through-hole portions 8a, 8b are slidably moved to the upstream of the sewing traveling direction Y by the strip-shaped member 8 When the side and the sliding movement are moved to the downstream side of the sewing traveling direction Y, respectively, the needle dropping portion 3a of the needle plate 3 and the cloth feeding tooth outlet groove 3b are communicated with each other, and the pair of through hole portions 8a, A needle thread overturning portion 8c is formed between 8b. Further, a stopper portion 8d is formed at an upstream end of the belt-shaped member 8 in the sewing traveling direction Y, and when the belt-like member 8 is slidably moved to the downstream side in the sewing traveling direction Y, the stopper portion 8d and the above One of the sliding guides 7, 7 abuts, causing it to stop further sliding movement toward the downstream side.

The strip-shaped member 8 constituting the needle thread tilting movement guide member 5 is configured to be slidably moved to the upstream side of the sewing traveling direction Y via the air cylinder 6 at the time of sewing the sewing first stitch, and In the position, the needle thread overcending portion 8c abuts against the needle thread end portion NTa on the surface of the complete cloth W at the time of sewing of the sewing start first needle. Then, when the strip-shaped member 8 is slidably moved toward the downstream side in the sewing traveling direction Y via the air cylinder 6 before the sewing operation of the second stitch, the needle thread protruding from the surface of the complete fabric W by the needle thread overturning portion 8c The end portion NTa is guided in a collapsed state toward the downstream side of the sewing traveling direction Y.

The needle thread end portion 8c of the above-described strip-like member 8 is for the needle end portion The abutting edge portion 8e of the NTa is formed in a substantially arc shape, which is gradually located on the upstream side in the sewing traveling direction Y as the both sides in the width direction travel toward the center portion. Thereby, when the strip-shaped member 8 is slidably moved to the downstream side of the sewing traveling direction Y and the two needle thread end portions NTa are overwhelmed by the needle thread crimping portion 8c, the two needle thread end portions NTa are substantially arc-shaped. The edge portions 8e are displaced in the direction in which they approach each other.

Next, the following operation will be described with reference to FIGS. 4 to 8 , which is an operation of swaying and sewing a complete fabric W such as a lower portion of a T-shirt under the use of the horizontal cylindrical double-loop sewing machine M having the above-described configuration.

As shown in FIG. 3 and FIG. 4, the strip-shaped member 8 constituting the needle thread tilting movement guide member 5 is slidably moved to the upstream side in the sewing traveling direction Y via the air cylinder 6 as shown in FIGS. 3 and 4 .

In this state, the needle 1 passes through the overlapping fabric portion of the complete fabric W and passes through the needle drop portion 3a of the needle plate 3 and one of the strip-like members 8 through the hole portion 8a to reach the needle plate 3, and thereafter rises. In the state where the sewing is started, the stitching operation of the first stitch is performed. Thereby, the needle thread 圏NTb is formed under the needle plate 3, and the needle thread end portion NTa is convexly left on the surface Wf of the entire cloth W, which is in the strip-like member 8 constituting the needle thread tilting movement guiding member 5. The abutting edge portion 8e of the needle thread crushing portion 8c abuts. Further, with the start of the engagement of the needle 1, the entire fabric W is fed in the sewing traveling direction Y by the feed teeth of the front and rear, and the thread hook 2 advances to capture the needle thread 圏NTb formed under the needle plate 3.

Then, as shown in FIG. 5, when the wire hook 2 is advanced to a predetermined position and the wire end portion LTa of the wire hooking wire LT is detached from the wire hook wire holding portion of the wire hook cutting blade mechanism 9, the frame is formed. The strip-shaped member 8 of the needle thread dumping movement guide member 5 is slidably moved from the upstream side of the sewing traveling direction Y toward the downstream side by the air cylinder 6.

As shown in Fig. 6, by the sliding movement of the strip-shaped member 8 toward the downstream side in the sewing traveling direction Y, the sewing operation of the first stitch during the sewing start is kept intact. The needle end portion NTa that abuts against the abutting edge portion 8e of the needle thread crushing portion 8c of the plate-like member 8 on the surface Wf of the cloth W is downstream of the sewing traveling direction Y by the abutting edge portion 8e. The side moves in a collapsed state.

When the abutting edge portion 8e is substantially arc-shaped, the two needle end portions NTa are displaced toward each other along the substantially arc-shaped abutting edge portion 8e. . Further, in a state in which the strip-shaped member 8 is slidably moved to the downstream side in the sewing traveling direction Y, the other through-hole portion 8b of the strip-shaped member 8 is also attached to the needle-drop portion 3a of the needle plate 3 and the cloth feeding tooth. When the hair supply groove 3 is connected, it does not become an obstacle to the movement of the subsequent feeding teeth of the cloth and the movement of the needle up and down. Therefore, the sewing operation after the second stitch can be normally performed.

Next, as shown in FIG. 7 and FIG. 8 , the sewing operation of the second stitch is performed by the ascending and descending movement of the needle 1 , the advance and retreat movement of the thread hook 2 , and the feeding of the front and rear feed teeth to the complete fabric. action. With the sewing operation after the second stitch, the needle thread 圏NTb caught by the hook 2 is sequentially looped by the hook line LT to perform double loop stitching.

Then, as shown in FIG. 9, after the sewing operation of the first stitch is completed, the two needle thread end portions NTa that are guided in the overwhelming state are moved toward the downstream side of the sewing traveling direction Y by the needle threading movement guide member 5. It is subjected to the treatment in the stitch A of the double loop stitch. At this time, the sewing process is performed in parallel or substantially parallel with the stitch A of the double loop stitch in a state in which the two needle thread end portions NTa are close to each other. Further, the wire hook end portion LTa is also subjected to the process of sewing into the stitch A together with the needle end portion NTa of the overturning movement guide.

By the above action, the hem flange of the double loop stitch A is formed on the entire circumference of the folded fabric portion of the complete fabric W, and the stitching of the first stitch is started at the hem of the hem. The needle end portion NTa protruding on the surface Wf of the cloth W is subjected to the process of sewing the stitch A of the double loop stitch before the sewing of the second stitch, whereby the operator does not need to take the time to manually cut the scissors. In addition, the labor can be reduced, and the time loss for manual cutting can be eliminated, and the efficiency of the sewing operation can be improved. Again, due to the operator The person does not need to hold the scissors, so the degree of freedom of the hand is increased, so that the operability of the cloth W is improved, and the quality of the seam product can be improved. Further, there is almost no case where the cloth W is damaged by the scissors, and the reduction in the value of the sewn product can be suppressed.

In particular, as in the case of the present embodiment, when the hem of the hem is performed with the complete fabric W as the object to be sewn, the sewing start portion and the end portion of the sewing are slightly overlapped, and at this time, since sewing can be started The needle thread end portion NTa which is sewn on the surface of the cloth W by the first stitch is pushed and guided by the downstream side of the sewing traveling direction Y with the sewing operation after the second stitch, and the stitch stitched into the double loop stitch is performed. In the process of A, it is not necessary to temporarily interrupt the sewing operation in the middle of sewing, and the hand-held scissors manually cuts the needle thread end portion NTa and then starts the sewing operation to perform the overlapping sewing, which may include the overlapping sewing of the sewing end portion. At the same time, the hem of the entire fabric W is continuously creased. Thereby, the time loss for the processing of the needle thread end portion NTa can be eliminated, and the sewing work efficiency can be further improved.

Further, since the stitch end portion NTa is sewn into the stitch A in parallel or substantially parallel with the respective stitches NTb, even when viewed from the back side of the cloth W, the stitching of the stitches is extremely small, and the appearance can be obtained. The quality of the finished product is better.

Further, when the needle thread end portion NTa protruding from the surface Wf of the cloth W is moved in the overwhelming state toward the downstream side of the sewing traveling direction Y during the sewing operation after the second stitch, the overwhelming movement can be performed by the overwhelming movement. The needle end portion NTa is guided so that the wire hook end portion LTa is also pressed together and sewn into the stitch A, and the line hook end portion LTa is prevented from being largely exposed from the stitch A toward the side, so that a better appearance can be obtained. Sewing product quality.

Although the embodiment of the present invention has been described above, the present invention is not limited to the double-circle type double-circle sewing machine M applied to the double-needle type, even if it is applied to a single-needle type double-stitch sewing machine other than the horizontal cylindrical shape or The platform type double loop sewing machine can also exert the same effects as the above embodiment.

Further, in the above-described embodiment, as the needle threading tilting guide member 5, a strip-shaped member 8 having a configuration in which the lower surface of the needle plate 3 is slidably movable in the sewing traveling direction Y and the sliding movement is used In the direction, one pair of through-hole portions 8a and 8b that communicate with the needle-drop portion 3a of the needle plate 3 and the cloth feed-tooth slot 3b are formed in parallel, and between the pair of through-hole portions 8a and 8b. The needle thread overturning portion 8c is formed; however, the present invention is not limited thereto, and any one of the needle thread end portions NTa protruding from the surface of the cloth W may be moved in an overwhelming state toward the downstream side of the sewing traveling direction Y. Composition.

Further, in the above embodiment, the needle thread tilting movement guide member 5 is provided on the lower surface of the needle plate 3, but may be provided on the upper surface of the needle plate 3.

Further, as the actuator that forcibly moves the needle threading movement guide member 5 to the position on the upstream side in the sewing traveling direction A and the position on the downstream side, the cylinder 6 is used in the above embodiment, but the invention is not limited thereto. It is also possible to use an electromagnetic solenoid or a fluid cylinder other than an air cylinder.

1‧‧ needle

4‧‧‧Fixed metal parts

12‧‧‧ needle stick

13‧‧‧needle mounting tools

B‧‧‧Sewing machine table

C‧‧‧Sewing machine arm

D‧‧‧Sewing machine main body

M‧‧‧Double loop sewing machine

W‧‧‧Complete fabric

Claims (11)

A sewing method for a cloth, which feeds a fabric along a surface of a needle plate in a predetermined sewing traveling direction, and forms a needle thread under the needle plate by at least one needle that holds the needle thread and moves up and down. And capturing the needle thread 之前 before the thread hook capable of performing the advance and retreat motion in a direction substantially orthogonal to the upward movement path of the needle, the captured needle thread 线 being held by the thread hook of the thread hook Performing a looping, thereby forming a double loop stitch on the cloth; the sewing method of the cloth is characterized in that the stitch end portion protruding on the surface of the cloth when the sewing first stitch is sewn is At the time of the sewing operation after the second stitch, the downstream side of the sewing traveling direction is guided by the push-down state, whereby the stitch end portion is subjected to the process of sewing the stitch of the double loop stitch. The sewing method of the fabric of claim 1, wherein the needle thread end portion is sewn into the stitch of the double loop stitch in parallel or substantially parallel with the plurality of needle stitches forming the stitch. A method for sewing a fabric, which is a method for sewing a complete fabric, wherein a folded fabric portion is formed by folding an end edge portion of a complete fabric toward a back side of the fabric, and is sewn along the upper surface of the needle plate. Feeding in the traveling direction, forming a needle thread under the needle plate by at least one needle holding the needle thread and moving up and down, and performing the advance and retreat action in a direction substantially orthogonal to the movement path of the needle above and below the needle The thread hook is further captured before the thread hook, and the captured needle thread is looped by the thread hook line held by the thread hook, thereby forming a double on the entire circumference of the overlapping cloth portion of the complete cloth. The stitching method of the loop; the sewing method of the fabric is characterized in that the stitch end portion protruding on the surface of the overlapping fabric portion at the time of sewing the first stitch of the sewing is performed at the sewing operation after the second stitch The downstream side in the traveling direction of the sewing is guided in an overwhelming state, whereby the needle thread end portion is subjected to a process of sewing into the stitch of the double loop stitch. The sewing method of the fabric of claim 3, wherein the needle thread end is The process of sewing into the stitches of the double loop stitch in parallel or substantially parallel with the stitch thread forming the stitch. A double loop sewing machine comprising: a needle board that carries a cloth and guides the cloth to feed in a predetermined sewing traveling direction; at least one needle that holds the needle thread and moves up and down; and a thread hook that holds the thread hook And performing a forward and backward movement in a direction substantially orthogonal to the upper and lower movement paths of the needle, and capturing a needle thread formed by the needle under the needle plate during the forward movement; and, the forward movement by the thread hook And the stitching thread caught by the thread hook is looped by the thread hook line held by the thread hook, thereby forming a double loop stitch on the cloth; the double loop sewing machine is characterized by: needle thread tilting movement a guiding member on the lower surface or the upper surface of the needle plate, which is located on the upstream side of the above-mentioned needle upper and lower movement path closer to the sewing traveling direction when the sewing first stitch is sewn, and after the second needle When the sewing operation is performed, the movement is moved to a downstream side of the upper and lower movement paths of the needle, and the needle thread end protruding on the surface of the cloth at the time of sewing the first needle is sewn. a portion that moves in a collapsed state toward a downstream side of the sewing traveling direction; and an actuator that forcibly moves the needle thread dumping movement guide member to an upstream side of the needle upper and lower moving path closer to the sewing traveling direction The position and the position on the downstream side. The double-stitch sewing machine of claim 5, wherein the needle threading movement guiding member is a guide member disposed near a rear end portion before a sewing traveling direction provided on a lower surface or an upper surface of the needle plate. a strip-shaped member that is slidably supported in the sewing traveling direction along the lower surface or the upper surface of the needle plate is formed with a pair of up-and-down direction through-hole portions and a needle thread over-pressure portion; When the sliding portion is moved to be closer to the upstream side of the sewing traveling direction than the upper and lower moving paths of the needle, and when the sliding movement is closer to the downstream side of the sewing traveling direction than the needle upper and lower moving paths, the needle plate is The needle drop portion and the cloth feeding tooth are connected by a slot; the needle thread overturning portion is located in the pair of through holes And when the position from the upstream side of the sewing traveling direction moves toward the downstream side, the needle end portion abuts on the surface of the cloth is abutted, and the needle end portion is overwhelmed toward the downstream side of the sewing traveling direction. . A double loop sewing machine for sewing a complete fabric, comprising: a needle board for placing a folded fabric portion which folds the end edge portion of the complete fabric toward the back side of the fabric and guides The laminated fabric portion is fed in a predetermined sewing traveling direction; at least one needle holds the needle thread and moves up and down; and a thread hook that holds the thread hook line and can be substantially orthogonal to the upper and lower movement paths of the needle Performing an advance and retreat operation on the upper side, and capturing the needle thread 形成 formed by the needle under the needle plate during the forward movement; and the thread hook 捕捉 captured by the thread hook forward movement using the thread hook held by the thread hook Performing a looping, thereby forming a double loop stitch on the entire circumference of the overlapping cloth portion of the complete cloth; the double loop sewing machine is characterized by: a needle thread tilting movement guiding member at the needle board On the lower surface or the upper surface, at the time of sewing the first needle of the sewing start, it is located on the upstream side of the upper and lower movement paths of the needle and closer to the sewing traveling direction, and moves during the sewing operation after the second stitch. The needle thread end portion protruding on the surface of the overlapping cloth portion is downstream of the sewing traveling direction when the stitching upper stitching path is closer to the downstream side of the sewing traveling direction. The side moves in a collapsed state; and an actuator forcibly moves the needle threading movement guiding member to a position closer to the upstream side of the sewing traveling direction than the needle upper and lower moving path and the downstream side. The double-stitch sewing machine according to claim 7, wherein the needle threading movement guiding member is a guide member disposed near a rear end portion before a sewing traveling direction provided on a lower surface or an upper surface of the needle plate. a strip-shaped member that is slidably supported in the sewing traveling direction along the lower surface or the upper surface of the needle plate is formed with a pair of up-and-down direction through-hole portions and a needle thread over-pressure portion; The hole portion is slidably moved to be closer to the upstream side of the sewing traveling direction than the above-mentioned needle upper and lower moving path, and is slidably moved to the above When the needle upper and lower moving paths are closer to the downstream side in the sewing traveling direction, the needle dropping portion and the cloth feeding tooth are connected to the outlet groove; the needle thread pressing portion is located between the pair of through holes; When moving from the position on the upstream side of the above-described sewing traveling direction to the position on the downstream side, it abuts against the needle end portion on the surface of the cloth, and the needle end portion is pressed against the downstream side in the sewing traveling direction. The double loop sewing machine according to claim 5, wherein the needle threading movement guiding member is configured to hold the thread hook line in the blade thread cutting blade mechanism in the thread hook line. At the timing when the portion is detached, the needle threading movement guide member is forcibly moved from the position on the upstream side in the sewing traveling direction toward the downstream side. The double loop sewing machine of the fifth or seventh aspect of the patent application, wherein the sewing machine as the object is a double-needle type horizontal cylindrical double loop sewing machine. The double loop sewing machine according to claim 10, wherein the needle thread overturning portion of the needle thread tilting movement guiding member is formed in a substantially arc shape with respect to the abutting edge portion of the needle thread end portion, and the substantially arc shape is As the two sides from the width direction travel toward the center portion, they are gradually located on the upstream side in the sewing traveling direction.