TW201839204A - Fabric holding device of sewing machine avoiding the application of an excessive load due to positional deviation or twisting to the sewing portion, or the occurrence of a deviation in the fabric feeding speed - Google Patents

Abstract

The present invention provides a fabric holding device of a sewing machine, the fabric holding device of a sewing machine is a fabric holding device attached to a sewing machine including a needle plate, a needle, and a fabric press metal movable up/down. At a position further on an upstream side in a sewing advance direction than a needle location part of the needle plate and separated laterally outward from a sewing machine body in a direction substabtially orthogonal to the sewing advance direction, a fabric holding tool capable of holding another end portion side of the fabric is provided by being supported by a fixing frame, so that the fabric holding tool can drive and rotate around a specific shaft center or can drive and move in the sewing advance direction while being synchronized and interlocked with a sewing operation of one end portion of the fabric, thereby mechanically exerting an assisting function by a left hand of a sewing operator, thereby avoiding application of a surplus load on a sewing place due to positional deviation and twist, and avoiding occurrence of unevenness in fabric feeding speed, irrespective of a skill level of the sewing operator.

Description

   Cloth holding device of sewing machine   

The present invention relates to a cloth holding device attached to various sewing machines. In detail, for example, a cloth holding device suitable for a case where a double-cylinder-type horizontal cylindrical double chain sewing machine is used to hem the entire edge of a round fabric such as a T-shirt to prevent sewing Loose threads, or hem the skirt by folding the edges in half instead of loops, but in the state of being unfolded into a piece of fabric, or using a hemming sewing machine to lap the entire overlap of one end of a round fabric, Or instead of looping, the skirt is folded into a piece of cloth, and its edges are folded in half to be sewn. In the following description, it is assumed that each of the above-mentioned sewings is collectively expressed as a hemming sewing.

For example, as shown in FIG. 8, when a double chain stitch sewing machine M is used to hem a round fabric W such as a T-shirt, a sewing operator has conventionally held the edge portion Wa of one end side with his right hand to guide Lead to the sewing section S of the sewing machine M and guide the feed. On the other hand, use the left hand to gather the other end portion Wb of the round cloth W to hold it slightly upwards to the edge portion Wa, and The other end portion Wb on the left-hand side is rotated in the direction indicated by the arrow by cooperating with the hem sewing before advancing, thereby assisting the hem sewing.

In addition, as shown in FIG. 9, when the double chain stitch sewing machine M is used to fold the skirt into a piece of cloth W instead of being looped, the edge portion Wa is folded in half and the seam is sewn. In the past, The sewing operator holds the edge portion Wa at one end side with his right hand, guides it to the sewing portion S of the sewing machine M, and guides the feed. On the other hand, the other end portion Wb of the cloth W is moved to the opposite side with his left hand. The edge portion Wa is lifted slightly upward, and it is grasped lightly, and the other end portion Wb on the left-hand side is guided in the direction indicated by the arrow by cooperating with the advancement of the hem sewing to assist the hem sewing.

As described above, in the past, the sewing operator used his left hand to hold the edge portion Wa which is the sewing portion of the fabric W on the opposite side to the other end portion Wb of the fabric, and raised it to be slightly closer to the edge edge portion Wa. The feeling of the upper side is matched with the feeding of the other end portion Wb in accordance with the advance of the hem sewing, so that the double end is used so that the load caused by the weight of the fabric W or the twist of the middle portion of the fabric is not applied to the edge portion Wa. Assisting sewing by hand. As a result, the edge portion Wa is prevented from shifting to the left from the sewing portion S of the sewing machine M, the middle portion of the fabric W is twisted, or the feed cannot be performed at a precise speed in the sewing advance direction. This enables precise and good hem sewing.

However, as described above, in order to prevent the positional deviation of the sewing area or the twist of the fabric, or to perform the left-hand operation (auxiliary function) to maintain the fabric feed speed in the sewing advance direction without deviation, the sewing operation The personnel must be familiar with a relatively high level of proficiency. If it is a sewing operator with low proficiency, there are problems such as the position of the edge part being offset from the sewing part of the sewing machine when the hem is sewn, or the middle part of the fabric torsion. Or, it is further difficult to assist so that there is no deviation in the feeding speed of the fabric in the sewing advance direction, and it is impossible to perform accurate and good hemming sewing.

The present invention has been made in view of the above-mentioned actual circumstances, and an object thereof is to provide a cloth holding device for a sewing machine which can mechanically exert a left-hand auxiliary function of a sewing operator and Irrespective of the proficiency, it is possible to avoid applying excessive load to the sewing part due to position shift or torsion, or to cause deviation in the feed speed of the fabric, thereby performing accurate and good hemming sewing.

In order to achieve the above object, the cloth holding device of the sewing machine of the present invention is characterized in that it is a cloth holding device attached to the sewing machine, and the above sewing machine includes a needle plate for setting one end of the cloth and guiding the cloth to a predetermined sewing direction. Feeding in the direction; the needle is configured to be movable up and down by the needle drop portion formed on the needle plate; and the cloth presser foot can be raised and lowered; it is closer to the upstream side of the sewing advance direction than the needle drop portion. And at a position which is away from the sewing machine body in a direction substantially orthogonal to the sewing advancing direction from the sewing machine body to the laterally outward direction, a cloth-end grip is provided on the fixed frame to hold the other end side of the cloth, and the cloth end The gripper is configured to be driven to rotate around a specific axis in synchronization with the sewing action at one end of the fabric, or to be driven to move in the sewing advance direction.

According to the cloth holding device of the sewing machine of the present invention having the above-mentioned characteristics, for example, when the edge of a round cloth such as a T-shirt or a piece of skirt cloth is put in an unfolded state, the edge is folded in half and folded. In the case of side sewing, one end of the fabric that becomes the sewing site is set on the needle plate by using the right hand of the sewing operator. On the other hand, the other end of the fabric can be held by the fabric end holder and can be used for sewing. Before starting, keep the other end of the fabric on the upstream side of the sewing advance direction than the needle drop section and move away from the sewing machine body in the lateral direction. In addition, by starting with the operation of the sewing machine, the cloth-end grip that holds the other end of the cloth is synchronized with the sewing action of the one end of the cloth to be driven to rotate around a specific axis or to move in the sewing forward direction. , It is possible to avoid as much as possible the excessive load caused by the weight of the cloth or the twist of the middle of the cloth or the deviation of the feed rate of the cloth to the edge portion that becomes the sewing part during the predetermined sewing operation. That is, the left-hand operation (assistance function) of the sewing worker can be mechanically completed by the cloth end grip. Therefore, it is possible to avoid unreasonable load on the sewing part of the fabric due to positional deviation or torsion as much as possible regardless of the proficiency of the sewing operator, and to avoid deviations in the feeding speed of the fabric as much as possible, and it is possible to perform accurate And good hem sewing and other effects.

In the cloth holding device of the sewing machine of the present invention, the sewing machine to be applied may be any of a sewing machine for hemming sewing, a double chain sewing machine, or a hemming sewing machine, and the sewing machine for hemming sewing includes the needle plate described above. , The needle, and the presser foot, the needle plate is used to set an overlapped portion formed by folding back one end of the fabric and guide the feeding of the overlapped portion to the sewing advance direction; the double chain stitch sewing machine is provided with: The needle plate is used to set an overlapped portion formed by folding back one end of a round fabric and guide the feed of the overlapped portion to the sewing advance direction; a plurality of needles are connected with the sewing advance direction Arranged side by side in a generally orthogonal direction; and a thread hook that holds the thread hook and can be in the direction of sewing advance within the range between one side and the other side of the juxtaposed direction of the plurality of needles The forward and backward movements are performed in a generally orthogonal direction. During the forward movement, the plurality of needles capture a plurality of needle thread loops formed under the needle plate. A double chain stitch is formed on the entire circumference of the overlapping portion of one end of the round cloth. The stitch sewing machine includes the needle plate for setting the overlap formed by folding back one end of the round cloth. Part, and guides the feed of the overlapped part in the sewing advance direction; a needle, which holds the needle thread, and is configured to be movable up and down by a needle drop portion formed on the needle plate; and a thread hook, which holds The hook is threaded, and is configured to form a seam-stitched seam mark on the entire periphery of the overlapping portion of one end of the round cloth by a sewing action.

In addition, a double chain stitch sewing machine configured to form a double chain stitch on the entire circumference of the overlapping portion of one end of the round cloth and a hem is formed on the entire periphery of the overlapping portion of the round cloth. In the case where a round-shaped cloth sewing machine for sewing a round object constituted by sewing seam marks is used as an application object, the cloth end grip is preferably configured to be driven and rotated around a vertical or substantially vertical axis.

In this case, the other end portion of the cloth held by the cloth end gripper can be used for full-circle sewing of one end of the cloth when the seam marks are formed on the entire circumference of the overlapping portion of the round cloth end portion. By rotating and rotating, it is possible to more surely reduce the load applied to the sewing portion due to the twist of the two ends of the fabric.

Moreover, in the cloth holding device of the sewing machine of the present invention, the cloth end holding tool is preferably composed of a pair of holding pieces that can be driven to open and close through a cylinder.

In this case, the other end portion of the fabric can be reliably held by a pair of gripping pieces that are driven to be opened and closed firmly, for example, by simply holding the other end portion of the fabric in a hooked state. Compared to the situation, the desired auxiliary function using the cloth-end grip can be achieved reliably and stably.

Further, in the cloth holding device of the sewing machine of the present invention, the cloth end holding device is preferably configured to be driven to rotate about one axis or less around the axis in synchronization with the sewing operation of the sewing machine, and to rotate with the other end of the cloth After the lifting of the part is released, the cloth presser foot rotates in a direction opposite to the rotation in association with the raising of the cloth presser foot, and automatically returns to the origin.

In this case, the cloth-end grip that holds the other end of the cloth is synchronized with the sewing motion of the sewing machine to rotate around a specific axis for 1 turn or less, so that no unnecessary load is applied to the cloth sewing part. Without twisting the fabric due to excessive rotation, and after the sewing action, the fabric end holder after the release of the other end of the fabric is released can be automatically restored to the sewing start in conjunction with the rise of the fabric presser foot The previous state (return to the origin), and you can quickly prepare for the next sewing.

Furthermore, in the cloth holding device of the sewing machine of the present invention, it is preferable that the cloth holding device is supported to be adjustable in position with respect to the fixed frame in an up-down direction and a direction substantially orthogonal to a sewing advance direction, respectively.

In this case, according to the size of the fabric to be sewn, especially the length from the end of the fabric to the other end, or the shape and weight of the fabric, the position of the grip on the fabric end is in the up-down direction and advancing with the sewing. The position is adjusted in a direction orthogonal to the direction, so that regardless of the size, shape, and weight of the fabric as the sewing object, it can be held without applying an excessive load to the sewing portion at one end. The other end of the fabric reliably supports the sewing operation.

1‧‧‧ needle

2‧‧‧ Needle plate

4‧‧‧ fabric presser foot

5‧‧‧ Feeding teeth for bottom feed

6‧‧‧ Cloth end grip

6A, 6B ‧‧‧ a pair of holding pieces

7‧‧‧ Stepping motor for rotation of cloth end grip

9‧‧‧ fixed frame

M‧‧‧Double Chain Sewing Machine

H‧‧‧ Cloth holding device

W‧‧‧ Sewing fabric (round fabric)

Wa‧‧‧ Sewing part on one side

Wb‧‧‧ the other end

Y‧‧‧ Direction of sewing

FIG. 1 is an overall perspective view of a double-cylinder double-cylinder double chain stitch sewing machine of the embodiment of the present invention and a cloth holding device attached to the sewing machine.

Fig. 2 is an overall front view of the sewing machine and the cloth holding device.

Fig. 3 is an overall plan view of the sewing machine and the cloth holding device.

Fig. 4 is an overall left side view of the sewing machine and the cloth holding device.

FIG. 5 is a diagram viewed along arrow A of FIG. 3.

FIG. 6 is a view viewed along arrow B of FIG. 2.

FIG. 7 is an overall perspective view showing a state of holding the fabric when the folded edge of the round fabric is sewn.

FIG. 8 is an overall perspective view explaining the auxiliary state of a cloth end portion when sewing a conventional round cloth cloth at the time of hemming.

FIG. 9 is an overall perspective view explaining the auxiliary state of the end of the cloth when the conventional unfolded cloth is folded and sewn.

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

FIG. 1 is an overall perspective view of a two-needle-type horizontal cylindrical double chain stitch sewing machine and a cloth holding device attached to the sewing machine according to an embodiment of the present invention, and FIGS. 2 to 4 are the entire front of the sewing machine and the cloth holding device. FIG. 5 is a view viewed along arrow A in FIG. 3, and FIG. 6 is a view viewed along arrow B in FIG. 2.

The above-mentioned two-needle horizontal cylindrical double chain stitch sewing machine M is provided with a sewing machine arm portion 21 and a sewing machine base portion 22 extending substantially parallel to each other from the upper portion and the lower portion of the sewing machine body 20 toward the left side. A needle drive mechanism that assembles a main shaft of the sewing machine and a left and right two needles 1, 1 (see Fig. 2) arranged side by side in a direction substantially orthogonal to the sewing advance direction Y is assembled inside the sewing machine arm portion 21, The cloth presser foot 4, the presser foot lifting driving mechanism for driving the presser foot 4 up and down, or the power transmission mechanism for each of these driving mechanisms, etc., but such driving mechanisms or power transmission mechanisms are well known, so The illustration and detailed description are omitted.

A needle plate 2 having a needle drop portion forming a needle drop position is fixed to the upper surface portion of the sewing machine base portion 22, and the following components and the like are assembled in the sewing machine base portion 22 below the needle plate 2, namely: The feed teeth 5 for cloth lower feeding force the cloth W provided on the needle plate 2 to be intermittently and forcibly moved in the sewing advance direction Y. The thread hook retains the thread of the hook and is in contact with the needles 1 and 1 described above. The up and down reciprocating motion path can be moved forward and backward in the left-right direction, which captures the two needle thread loops formed by the needles 1 and 1 under the needle plate 2 during the forward motion; and a thread cutting device. Here, since the configuration or operation of the thread hook, the thread trimming device, and the mechanism for advancing and retracting the thread hook are well known, illustrations and detailed descriptions are omitted.

The double chain stitch sewing machine M of the two-needle style with the above configuration is provided with a cloth holding device H which is independent of the sewing machine M. The cloth holding device H is disposed on the upstream side of the sewing advance direction Y from the needle drop portion of the needle plate 2 in the sewing machine M described above and leftward from the sewing machine body 20 in a direction substantially orthogonal to the sewing advance direction Y. The laterally outward position is provided with a cloth end gripper 6 that can hold the other end side opposite to one end of the cloth W sewn by the sewing machine M described above; a stepping motor 7 that makes the Cloth end grip 6 is driven to rotate around the axis in the vertical direction; and a fixed frame 9 is fixed to support the horizontal abutment 8 where the cloth end grip 6 and the stepping motor 7 are arranged in a vertical position relationship. .

The above-mentioned cloth-side gripper 6 is as shown clearly in FIGS. 5 and 6, and is formed by a plate-shaped fixed gripping piece 6A and swinging around a horizontal axis by a telescopic movement through a cylinder (not shown). The movable holding piece 6B is configured to be driven to open and close freely with respect to the fixed holding piece 6A. The cloth-end grip 6 composed of the pair of grip pieces 6A and 6B is configured in such a manner that the solenoid valve that controls the supply of air to the cylinder is switched to one direction by receiving the sewing end signal of the sewing machine M The air cylinder is contracted, so that the movable holding piece 6B is driven to open relative to the fixed holding piece 6A to release the grip of the cloth end, and the moving piece 15a of the limit switch 15 installed on the horizontal base 8 is released. A pressing operation is performed to switch the solenoid valve to the opposite direction to extend the cylinder, so that the movable holding piece 6B is driven to close with respect to the fixed holding piece 6A to hold the cloth end.

The cloth end holder 6 is driven by the stepping motor 7 which is started by receiving the operation start signal of the sewing machine M, and rotates around the vertical axis in the state of being synchronized with the sewing operation of the sewing machine M. Rotation in the direction of arrow R in FIG. 6. The driving rotation of the cloth-end grip 6 about the above-mentioned axis is set to one rotation (360 degrees) or less.

In addition, a switch pressing cam that rotates integrally with the cloth-side gripper 6 around the axis in the vertical direction is fixed to a portion of the output shaft of the stepping motor 7 immediately below the horizontal base 8. 10, and in a position corresponding to the rotation trajectory of the end portion before the switch pressing cam 10, the cloth end holding tool 6 before the sewing start causes the cloth end holding tool 6 to hold the cloth end portion, that is, the cloth The origin position of the end grip 6 is provided with a switch operating piece 11a for limiting the switch 11 for stopping the operation of the stepping motor 7. According to the above-mentioned configuration, the cloth-side holding tool 6 is configured in such a manner that the stepping motor 7 linked to the raising of the cloth presser 4 after the grip on the cloth-side is released is rotated in the opposite direction. The reverse direction of the above rotation, that is, the rotation in the direction of arrow L in FIG. 6 is accompanied by the rotation. At the time when the switch pressing cam 10 contacts the switch operating piece 11a to limit the pressing operation of the switch 11, the stepping motor 7 is reversed. The rotation is stopped so that the cloth-end grip 6 is automatically returned to the origin.

In addition, a slide frame 14 that can be slidably moved and fixed in the sewing advance direction Y of the sewing machine M through the long hole 12 and the fixture 13 is continuously provided at the front end of the fixed frame 9. The slide frame 14 is fixedly supported by the slide frame 14. The above-mentioned horizontal abutment 8. Although the fixing frame 9 is not shown in the figure, it is configured to be movable and fixed in the vertical direction and the direction X substantially orthogonal to the sewing advance direction Y. With this configuration, the cloth end grip 6 is supported with respect to the fixed frame 9 in an up-down direction, a sewing advance direction Y, and a direction X substantially orthogonal to the sewing advance direction Y, and is supported to be adjustable in position.

By adopting such a structure, the position of the holding end of the cloth end can be adjusted in the vertical direction and according to the size of the cloth to be sewn, in particular, the length dimension from one end of the cloth to the other end, the shape of the cloth, and the weight. Adjust the position in a direction approximately orthogonal to the sewing advance direction. Regardless of the size, shape, and weight of the fabric as the sewing object, hold it in a state where no excessive load is applied to the sewing part at one end. The other end of the fabric is held to assist the sewing operation.

Next, referring to FIG. 7, the circular needle-shaped double chain stitch sewing machine M and the fabric holding device H of the double needle style of the present embodiment configured as described above are used to perform round objects such as the edge of the T-shirt. The sewing operation of the hemming of the fabric W will be described.

First, in a state where the cloth presser foot 4 is driven up, and a pair of holding pieces 6A and 6B are driven to be opened at the cloth end holding tool 6 of the cloth holding device H, the position will be The cloth part (sewing part) Wa of one end side edge of the round cloth W is folded and overlapped to the back side of the cloth, and the cloth part (sewing part) Wa is set on the needle plate 2. Then, the presser foot 4 is driven to lower, and On the other hand, the other end portion Wb of the round cloth W is inserted between the pair of holding pieces 6A and 6B of one of the cloth-end holding tools 6 in the cloth holding device H, and the limit switch 15 is manually adjusted. The moving piece 15a performs a pressing operation, and the movable holding piece 6B is driven to open relative to the fixed holding piece 6A by the extension action of the air cylinder to hold the other end portion Wb of the round cloth W.

In this state, by starting the rotation operation of the horizontal cylindrical double chain sewing machine M, the sewing portion Wa of the round cloth W is applied by the cloth feed feed teeth 5 acting on the lower surface of the sewing portion Wa. A series of sewing operations, such as intermittently forcibly moving the presser foot 4 acting on the upper surface toward the sewing advance direction Y, and the left and right needles 1, 1 moving up and down along with the rotation of the sewing machine M, and the thread hook moving forward and backward The operation is performed, and hemming is performed on the entire circumference of the sewing portion (overlapping portion) Wa of the round fabric W to form a double chain stitch.

During the sewing of the hemming edge as described above, the cloth end grip 6 holding the other end portion Wb of the round cloth W is a step that moves in synchronization with the sewing action of the side edge portion Wa of one end of the cloth. The motor 7 is driven to rotate and rotates about the axis in the vertical direction in the direction of arrow R in FIG. 6. As much as possible, it is possible to avoid an unnecessary load due to the weight of the cloth or the twist of the middle of the cloth to the edge portion Wa which becomes the sewing part during a predetermined sewing operation due to the rotation of the cloth end gripper 6, or due to This load causes a deviation in the cloth feed speed in the sewing advance direction Y. With this, the cloth end holding tool 6 of the cloth holding device H mechanically completes the left hand operation (auxiliary function) of a sewing operator who is familiar with the same sewing, and has nothing to do with the proficiency of the sewing operator. It does not apply unnecessary load to the sewing part of the round cloth W due to position shift or torsion, nor does it perform accurate and good hem sewing without deviation in the feed speed of the cloth.

Furthermore, at the time point when the predetermined hemming of the double chain seam is completed at the entire circumference of one end portion Wa of the round cloth W, and the thread cutting by the thread trimming device is completed, the cloth end is held One of the pair of holding pieces 6A, 6B is driven to open and the grip of the other end portion Wb of the round cloth W is released, and the cloth presser foot 4 is driven to rise, so that the hemmed sewing can be completed in this state. The round cloth W is reset from the sewing machine M.

In addition, the stepping motor 7 rotates in reverse in conjunction with the raising of the cloth presser foot 4, so that the cloth end grip 6 rotates in the reverse direction of the arrow L in FIG. The switch pressing cam 10 that rotates integrally with the holder 6 contacts the switch actuating piece 11a to press the limit switch 11. As a result, the reverse rotation of the stepping motor 7 stops, and the cloth end holder 6 When the holding pieces 6A and 6B are opened, they automatically return to the original position and stop, and they can quickly prepare for the next sewing.

In addition, in the above-mentioned embodiment, it has been described that the other end portion Wb of the round cloth W is held by the cloth end holding tool 6, and the cloth end holding tool 6 and The other end portion Wb of the gripped fabric is rotated around the vertical axis in synchronization with the sewing action, and is exerted if the edge portion Wa which becomes the sewing portion is not caused by the weight of the fabric or the twist of the middle portion of the fabric. Extra load, or auxiliary functions that do not cause a deviation in the cloth feed speed in the sewing advance direction Y due to the load, but of course, other than this, of course, a double chain sewing machine can be used as shown in FIG. 9 M, when the skirt is unfolded into a piece of cloth W, and the edge portion Wa is folded in half to sew, the other end portion Wb of the cloth W is set to The end of the sewing part Wa is lifted slightly upward, so that the cloth end grip 6 is held, and the cloth end grip 6 is guided in the sewing advance direction in accordance with the advance of the hem sewing, and the hem is displayed. Sewing auxiliary function .

In addition, the sewing machine with the cloth end holding device of the present invention is not limited to the above-mentioned multi-needle-type horizontal cylindrical double chain stitch sewing machine, but it can also form a hemming edge on the entire periphery of the overlapping portion on one end side of the round cloth. Sewing seam stitch sewing machine.

Furthermore, in the above-mentioned embodiment, a person who is set to receive the sewing end signal of the sewing machine M and automatically performs the grip release operation of the cloth-end grip 6 is described, but it may be configured to be operated by pressing a button Perform the grip release operation.

Furthermore, in the embodiment described above, the cloth end holder 6 is constituted by a fixed holding piece 6A and a movable holding piece 6B that can be driven to open and close with respect to the fixed holding piece 6A. In order to drive the opening and closing by swinging a pair of holding pieces far and near each other, a pair of spring-shaped pieces may be used.

Claims (7)

    A cloth holding device for a sewing machine is characterized in that it is attached to the sewing machine. The sewing machine includes: a needle plate which is provided at one end of the cloth and guides the feed in a predetermined sewing advance direction; the needle is used to pass through The needle drop portion formed on the needle plate is configured to be movable up and down; and the cloth presser foot can be raised and lowered; it is closer to the upstream side of the sewing advance direction than the needle drop portion and is substantially orthogonal to the sewing advance direction A position away from the sewing machine body toward the lateral direction in the direction is supported on a fixed frame by a cloth-end grip that is capable of gripping the other end side of the cloth, and the cloth-end grip is structured to be compatible with the cloth. The sewing operation at one end is driven to rotate around a specific axis in synchronization with the sewing operation or to move in the sewing advance direction.         For example, the cloth holding device of a sewing machine for which the scope of the patent application is item 1, wherein the sewing machine is provided with the needle plate, the needle, and the presser foot for the seam sewing of the hem, and the needle plate is used to set one end of the cloth. The overlapped portion formed by folding back and guided the overlapped portion to feed in the sewing advance direction.         For example, the cloth holding device of a sewing machine for which the scope of the patent application is item 1 or 2, wherein the cloth end holding device is composed of a pair of holding pieces that can be driven to open and close freely through a cylinder.         For example, the cloth holding device of a sewing machine for which the scope of the patent application is item 1 or 2, wherein the cloth end holding device is configured as follows: in synchronization with the sewing operation of the sewing machine, it is driven to rotate about 1 axis or less around the above-mentioned axis in synchronization with After the grip on the other end of the cloth is released, the raising of the cloth presser foot rotates in a direction opposite to the rotation in association with the raising of the cloth presser foot, and automatically returns to the origin.         For example, the cloth holding device of a sewing machine for which the scope of patent application is item 1 or 2, wherein the cloth end holding device is adjustable relative to the fixed frame in an up-down direction and a direction substantially orthogonal to the sewing advance direction. stand by.         For example, the cloth holding device of a sewing machine for which the scope of patent application is item 1, wherein the above-mentioned sewing machine is a double chain stitch sewing machine as follows, which is provided with the above-mentioned needle plate for setting an overlapping portion formed by folding back one end of a round cloth. And guide the feed of the overlapped portion to the sewing advance direction; a plurality of needles, which are arranged side by side in a direction substantially orthogonal to the sewing advance direction; and a thread hook, which holds the thread hook line, and can cover the above The forward and backward movement is performed in a direction approximately orthogonal to the sewing advance direction within a range between one side and the other side of the plurality of needles in a juxtaposed direction, and the plurality of needles are captured under the needle plate during the forward movement. Formed a plurality of needle thread loops; and is configured to form a double chain stitch seam on the entire circumference of the overlapping portion of one end of the cloth of the round object by a sewing action, and the cloth end holding device can be wound vertically or approximately vertically The axis is driven to rotate.         For example, the cloth holding device of a sewing machine for which the scope of patent application is item 1, wherein the above-mentioned sewing machine is a lock-stitched sewing machine, which is provided with the above-mentioned needle plate, which is used to set an overlapping part formed by folding back one end of a round cloth. Guide the feed of the overlapped portion in the sewing advance direction; a needle that holds the needle thread and is configured to be movable up and down so as to pass through the needle drop portion formed on the needle plate; and a thread hook that holds the thread hook thread; and a constitution In order to form a seam-stitched seam mark on the entire circumference of the overlapping portion of one end of the cloth of the round object by a sewing action; and the cloth-end holding device is configured to be driven and rotated around a vertical or substantially vertical axis.