TW202045791A - Round fabric hem sewing machine - Google Patents

Abstract

A round fabric hem sewing machine includes: a sewing machine body which includes a fabric guide, a fabric edge turning guide device, and the like; a fabric edge position adjustment mechanism which includes a fabric gripper gripping the other end side of a fabric; a first fabric edge position detector which detects a one end side edge position of a round fabric; a second fabric edge position detector which is provided at a position on the upstream side in the sewing direction in relation to the first fabric edge position detector and on the left outside of the sewing machine body so as to detect a downstream portion in the vicinity of an end of a hem sewing part; and a controller which adjusts a position of the one end side edge of the round fabric to a predetermined position by driving and moving the fabric edge position adjustment mechanism in a specific direction on the basis of the detection result of the first fabric edge position detector, moves the fabric guide to a position on the left outside of the sewing machine body M on the basis of the detection result of the second fabric edge position detector while continuing hem sewing, and stops the driving of the sewing machine after hemming over a predetermined length thereafter. Accordingly, it is possible to provide a round fabric hem sewing machine capable of aligning a starting.

Description

Edge sewing machine for circular fabric

The present invention relates to an edge sewing machine for circular fabrics, which uses, for example, a double-needle horizontal cylinder double chain stitch sewing machine to place one end edge part of the entire circumference of the bottom swing part of a circular fabric such as a T-shirt on a relatively sewing part The needle drop part is further folded back across the specified width by the fabric end edge folding guide device at the upstream side of the sewing travel direction and overlaps up and down. The sewing part stitches the folded back part that overlaps up and down.

For example, when using a double chain stitch sewing machine to stitch the entire circumference of the bottom hem of a circular fabric such as a T-shirt, it is generally known that under the following conditions, the sewing industry uses both hands to artificially assist the edge stitching, namely , The sewing manufacturer uses the right hand to hold one end of the fabric and guide it to the sewing part of the sewing machine to guide the transmission. On the other hand, use the left hand to gather the other end of the circular fabric together and slightly more than the hem Lift and grasp it upwards, and transfer and guide the other end of the left hand side corresponding to the travel of the edge stitching.

However, as described above, in the case of conventional human assistance, there is a problem that due to external forces such as the weight of the fabric, one end of the circular fabric faces the direction orthogonal to the sewing direction ( Hereinafter, it is described as the left and right direction) displacement, and by this displacement, the position of one edge of the hem part is separated from the predetermined position, so that the hem part is easily shifted from the sewing part of the sewing machine to the left. As a result, the circular fabric is The folding back width of one end part is excessively insufficient, and it is difficult for sewing manufacturers with low proficiency to perform proper edge stitching.

Therefore, conventionally, a sewing machine for edge stitching (flanging stitching) of circular fabrics is proposed, which is located at a position on the upstream side of the sewing traveling direction than the sewing section including the needle drop section, and is provided below the conveying path of the fabric. A conveyor belt with a conveying surface that moves in the left and right directions, and a fabric pressing member is arranged above the conveyor belt. The fabric pressing member has an acting end facing the conveying surface of the conveyor belt across the conveying path of the fabric, and can The up and down driving movement is based on the detection of the fabric end edge of the fabric end detector arranged at the upstream position of the sewing traveling direction than the opposing part of the conveyor belt and the fabric pressing member, and the fabric pressing member is moved up and down to make one end of the fabric Clamped between the working end of the fabric pressing member and the conveyor belt, in this state, by moving the conveyor belt to move the clamping part in the left and right directions, the displacement of the fabric in the left and right directions is automatically corrected, thereby enabling the In the state that the end edge of one end of the lower swing part of the circular fabric is always adjusted to the specified position, the end edge of the one end is fed to the fabric end edge folding guide device to fold back the specified width, and the specified The folded-back part of the width is sent to the sewing part and can be sewn to a predetermined edge (for example, Japanese Patent Laid-Open Publication 2016-116636).

[The problem to be solved by the invention]

According to the edge sewing machine disclosed in the aforementioned Japanese Patent Laid-open Publication No. 2016-116636, the folding width of the bottom hem of a circular fabric can be roughly equalized throughout the entire circumference of the hem, even for a sewing manufacturer with low proficiency The prescribed edge stitching can also be performed appropriately and well.

However, according to the edge sewing machine disclosed in the aforementioned Japanese Patent Laid-open Publication No. 2016-116636, the edge of the edge seam part of the round fabric stitched by the sewing part is folded and stitched in half, so the round fabric before the edge stitching The edge of one end is stronger than the bending strength. Therefore, the edge stitched part of the circular fabric becomes a non-detection state that will not be detected by the fabric end detector. As the fabric pressing member moves downward, the edge stitched part of the circular fabric is clamped to the fabric pressing member Between the acting end and the conveyor belt. In this state, by moving the conveyor belt to move the clamping part in the left and right direction, the displacement in the left and right direction of the edge of the edge seam part of the circular fabric is automatically corrected. As a result, as with the edge of the round fabric before the edge stitching, the edge of the edge stitching portion is fed to the fabric edge folding guide device while the position is adjusted to a predetermined position. Under the condition that the bottom part of the shaped fabric is folded back again, there is a problem that not only the start and end parts of the edge stitching are not aligned on a straight line, but also a part of the bottom part of the circular fabric is partially thickened. Zhou Zhi's processing becomes unsightly.

The present invention has been completed in view of the above circumstances, and its purpose is to provide a circular fabric edge sewing machine, which can align the start and end portions of the edge stitching of the bottom hem of the circular fabric on a straight line, and can cover the hem Appropriate and beautifully processed edge stitching is performed all around the part. [Technical means to solve the problem]

In order to achieve the above object, the edge sewing machine for circular fabrics of the present invention is provided with a sewing section having a needle plate for guiding the circular fabric to be conveyed in the sewing traveling direction, and capable of up and down by passing through the needle drop portion formed on the needle plate The movable needle and the fabric pressing metal piece that can be raised and lowered; the fabric end edge folding guide device, which is arranged at the upstream side of the sewing traveling direction than the needle drop part of the sewing part, will make one end of the circular fabric The edge portion is folded down across a predetermined width and the folded portion overlapping up and down is sent and guided toward the sewing portion; and the fabric guide portion is arranged at a position on the upstream side of the sewing traveling direction than the fabric edge folding guide device, having The guiding surface of the fabric end edge sliding contact with one end side edge of the circular fabric guides the one end side edge of the circular fabric to move out of the aforementioned fabric end edge folding guide device; and guide it by folding back from the aforementioned fabric end edge The folded part of the circular fabric guided by the device toward the sewing section is stitched at the sewing section; the edge sewing machine for the circular fabric is characterized by having a fabric end edge position adjustment mechanism, which has a holding device for the other end of the fabric, The other end of the fabric holding tool is arranged on the upstream side of the sewing traveling direction than the needle drop portion and away from the sewing machine body in the direction orthogonal to the sewing traveling direction, and can hold the circular fabric The other end side of the fabric, and the fabric end edge position adjustment mechanism is configured to reciprocate and move the fabric other end holder in a specific direction to place one end edge of the circular fabric in a direction orthogonal to the sewing direction Position adjustment; a first fabric end edge position detector, which is arranged above the fabric guide, to detect the position of one end edge of the circular fabric; a second fabric end edge position detector, which is arranged in comparison with the first The fabric edge position detector is closer to the upstream side of the sewing traveling direction and closer to the lateral outer side of the sewing machine body in the direction orthogonal to the sewing traveling direction than the first fabric edge position detector, and detects the position above The downstream part near the edge of the sewing part of the circular fabric sewn by the sewing part; and the control part, which is based on the detection result of the first fabric edge position detector on the edge position of one end of the circular fabric, The fabric end edge position adjustment mechanism is driven to move in one of the specific directions to adjust the position of the one end side edge position to a predetermined position. On the other hand, the second fabric end edge position detector is based on the The detection result of the downstream part near the edge of the edge seam part of the circular fabric, the edge seam is continuously carried out and the fabric guide part is moved in the direction orthogonal to the sewing direction to close to the lateral outside of the sewing machine body After the specified position, the sewing machine will stop after stitching across the edge of the specified length. [Effects of Invention]

According to the edge sewing machine for circular fabrics of the present invention having the above-mentioned features, for example, when the bottom part of a circular fabric such as a T-shirt is folded in half for edge stitching, the sewing industry will use the right hand to make the sewing part One end of the circular fabric is placed on the needle plate of the sewing machine body and the fabric guide, on the other hand, the other end of the circular fabric is held by the other end holder of the fabric end position adjustment mechanism In this state, the main body of the sewing machine is started to move, whereby one end side edge of the circular fabric sent out in the sewing traveling direction through the fabric guide is in sliding contact with a part of the fabric end edge folding guide device to move to the needle The needle drop part of the board is stitched with the specified edge. In such edge stitching, the edge of one end of the circular fabric will shift in the left and right directions due to external forces such as the weight of the middle of the fabric applied during the conveying movement.

Then, when the position of one end side edge of the circular fabric deviates from the specified position with the displacement in the left and right direction, the fabric edge position adjustment mechanism is operated based on the detection result of the first fabric edge position detector Control to drive and move the holding device at the other end of the fabric toward one of the specific directions. Thereby, the edge of one end of the circular fabric can be automatically adjusted to a predetermined position over its entire length, and the folded width can be kept substantially constant, so that proper and good edge stitching can be always performed.

In addition, when the edge stitching process moves the downstream part near the edge position of the edge stitching part to the above-mentioned fabric guide part, the second fabric edge detector detects the position near the edge of the edge stitching part. Downstream part, and based on the detection result, continue edge stitching and move the fabric guide in the direction orthogonal to the sewing travel direction to a predetermined position on the lateral outside of the sewing machine body, thereby stitching the edge edge The part is aligned in a substantially straight line with the end edge of one end of the circular fabric fed into the sewing part in a half-folded state (the edge stitching terminal part), and it can prevent the edge of the edge stitching part from being based on the above-mentioned second The detection result of a fabric edge position detector is folded back twice, and the whole circumference of the hem part can be processed and beautifully stitched.

Moreover, it goes without saying that in the alignment of the above-mentioned edge stitching start end portion and the edge stitching end portion, after the edge stitching of a predetermined length is continued after the positional alignment is completed, the driving of the sewing machine is stopped and the operation is switched. In the manual sewing state, the following effect can be exerted, that is, the edge stitching distance of manual sewing can be shortened as much as possible, so that the position of the beginning and end portions of edge stitching can be easily and reliably aligned.

In the edge sewing machine of the circular fabric of the present invention, it is preferable to be constructed in such a way that it is located on the upstream side of the sewing traveling direction compared with the second fabric edge position detector and compared with the first fabric edge The detector is closer to the lateral outer side of the sewing machine body in the direction orthogonal to the sewing travel direction, and a third fabric edge detector is arranged to detect the position of the edge of one end of the circular fabric. When the edge detector detects the edge of one end of the circular fabric, the control unit adjusts the position of the edge of one end of the circular fabric to the non-detection position of the third fabric edge position detector, The fabric end edge position adjustment mechanism is driven to move in the other direction of the specific direction. In this case, when the sewing manufacturer manually places one end of the circular fabric as the sewing part on the needle plate and the fabric guide of the sewing machine body, the end edge of one end of the circular fabric covers the third When the position detection method of the fabric edge position detector is installed, the fabric edge position adjustment mechanism based on the detection result of the third fabric edge position detector is controlled to make the other end of the fabric holder face Drive movement in the other direction of the specified direction. Thereby, the position of one end side edge of the circular fabric is automatically adjusted to the non-detection position of the third fabric end edge position detector, and one end side edge of the circular fabric is from the third fabric end edge position detector The vicinity moves obliquely toward the detection area of the first fabric end edge position detector. By this oblique movement, wrinkles or curls on one end side of the circular fabric can be suppressed, and the edges can be sewn. Better processing.

In addition, in the circular fabric edge sewing machine of the present invention, it is preferable that the fabric guide portion is on the upstream side of the sewing traveling direction than the third fabric end edge detector and is larger than the third fabric end The edge detector is located closer to the laterally outer side of the sewing machine body in the direction orthogonal to the sewing traveling direction, and is provided with a fabric guide member that is in sliding contact with the edge of the circular fabric edge seam and the edge The edge stitched edge is moved and guided toward the second fabric edge position detector. In this case, after the start end of the edge stitching portion reaches the fabric guide portion, the edge of the edge stitching portion is brought into sliding contact with the fabric guide member and moved and guided toward the second fabric edge position detector, By this, it can be reliably detected that the starting end of the edge of the edge stitching part has reached the predetermined position, and the drive of the sewing machine can be stopped and switched to the manual sewing state of the operator with good timing, and the edge can be performed more reliably and stably. Align the start and end positions of the edge stitching.

Furthermore, in the edge sewing machine of the circular fabric of the present invention, it is preferable that an air ejection device is provided in the fabric guide portion, and the air ejection device is adjusted to a predetermined position near one end edge of the circular fabric Air is blown out, and one end edge of the circular fabric is pressed against the fabric end edge guide surface of the fabric guide. In this case, the position of the circular fabric is automatically adjusted to a predetermined position near the end of the circular fabric by the motion control of the above-mentioned fabric edge position adjustment mechanism based on the detection result of the first fabric edge position detector Air is ejected, and the edge of the circular fabric can be kept in the position after the automatic position adjustment, so that the width of the back folded part (folded back width) can be uniform throughout the entire circumference of the hem.

In addition, in the circular fabric edge sewing machine of the present invention, it is preferable that an air ejection device is provided in the fabric guide portion, and the air ejection device adjusts an end edge of the circular fabric by interacting with the fabric edge position adjustment mechanism. The air is ejected in conjunction with the position adjustment action of the position of the fabric, and the end edge of the circular fabric is pressed against the fabric edge guide surface side of the fabric guide. In this case, it is possible to spray air toward one end edge of the circular fabric in conjunction with the position adjustment operation of the fabric end edge position adjustment mechanism based on the detection result of the first fabric edge position detector. Stably adjust the position of one end of the circular fabric to the specified position.

In addition, in the circular fabric edge sewing machine of the present invention, the fabric edge position adjustment mechanism is configured to be based on the detection result of the first fabric edge position detector on the edge position of one end of the circular fabric The other end of the fabric holding device is driven to move in the up-down direction or the up-and-down oblique direction. This configuration is preferable in terms of space and operability. However, in addition to this, the other end holding device of the fabric may be configured to be relative to the sewing machine. The main body drives and moves in the horizontal direction away from and close to each other. Furthermore, it can also be configured that the other end holder of the fabric is synchronized with the sewing operation of the sewing machine body and can be driven to rotate around a vertical or substantially vertical axis. In this case, when edge stitching is performed on the entire circumference of the bottom swing portion of the circular fabric, the circular shape held by the holding device at the other end of the circular fabric can be made corresponding to the rotational movement used for the entire circumference sewing on one end side of the circular fabric The other end of the fabric automatically rotates, which can reduce the load applied to the sewing part due to the twisting of the two ends of the fabric, so that better edge stitching can be performed.

Hereinafter, an embodiment of the present invention will be described based on the drawings. Figure 1 is a schematic perspective view of the entire circular fabric edge sewing machine using a double needle horizontal cylindrical double chain stitch sewing machine as the sewing machine body according to the embodiment of the present invention, and Figure 2 is an enlarged perspective view of the main parts of the above edge sewing machine. Figure 3 is an enlarged perspective view of the main part of the edge sewing machine, Figure 4 is an enlarged perspective view showing the main part of the detailed structure of the fabric guide of the edge sewing machine, and Figures 5 to 7 show the circular fabric facing the edge An enlarged perspective view of the main parts of the sewing machine in the setting state, the folding and guiding action state of one end edge of the circular fabric, and the state of moving the edge of the edge stitching part. Furthermore, in the following description, "up and down", "left and right" and "front and back" indicated by arrows in FIG. 2 are used. Here, "front" refers to the side close to the sewing manufacturer, "back" refers to the side away from the sewing manufacturer, and "left and right" refers to the left and right when viewed from the front.

As shown in Fig. 1, in the above-mentioned double needle type horizontal cylindrical double chain stitch sewing machine M, the sewing machine arm 2 and the sewing machine head 3 extend substantially parallel to each other from the upper and lower parts of the sewing machine leg column 1 toward the left side. Inside the sewing machine arm 2, there are assembled: sewing machine main shaft; needle drive mechanism, which makes the two needles 4, 4 (refer to Fig. 2) on the left and right, which are arranged side by side in a direction substantially orthogonal to the sewing travel direction Y, on the top and bottom Reciprocating motion; the fabric pressing metal piece 5; and the pressing metal piece lifting drive mechanism that drives the pressing metal piece 5 up and down, and the power transmission mechanism to the drive mechanisms, etc.; but the drive mechanism and power transmission mechanism have been It is well-known, so the illustration and detailed description are omitted.

On the upper surface of the sewing machine head 3, a needle plate 6 that guides the circular fabric to be conveyed in the sewing travel direction Y is fixed, and a needle drop portion serving as a needle drop position is formed on the needle plate 6. In the sewing machine head 3 at the lower part of the needle plate 6, there are assembled conveying teeth for downward conveying of the fabric W which is placed on the needle plate 6 and which is intermittently forcibly transferred along the sewing travel direction Y. , And holding the thread hook thread and can perform forward and backward movements in the left and right directions approximately orthogonal to the up and down reciprocating path of the needles 4, 4, and the needles 4, 4 are captured and formed under the needle plate 6 during the movement of movement. Thread hook, thread cutting device, etc. of a needle thread loop. Here, the structure or operation of the conveying teeth, thread hooks, thread cutting device, and thread hook advance and retreat mechanism for downward conveying of the fabric are well known, so the illustration and detailed description are omitted.

In the horizontal cylindrical double chain stitch sewing machine M, a fabric end edge folding guide device 7 is provided at a position (front position) on the upstream side (front position) in the sewing travel direction Y from the needle drop position of the needle plate 6 described above. As clearly shown in Figure 2, the fabric folding guide device 7 is configured to include a guide plate 71 arranged in front of the needle drop portion and a ruler body 72 that is bent into a substantially U-shape in front view to feed it toward the needle drop position. One end of the circular fabric W (refer to Figures 5 to 7) is folded back down with a fixed width, and after overlapping with the lower side of the rest of the fabric, the end edge of the folded back part is aligned with the above-mentioned rule The curved inner surface (fabric end edge guide surface) of the ruler body 72 is in sliding contact and guides the movement toward the sewing part including the needles 4, 4, the fabric pressing metal piece 5, the needle plate 6, and the like.

In the aforementioned fabric end edge folding guide device 7, a plurality of air pipes 73 for guiding high-pressure air from an air supply source (not shown) are arranged side by side in the front-rear direction. Among them, the high-pressure air supplied to the air piping 73 at the front position is sprayed to the left in front of the guide plate 71 and the ruler body 72, and the sprayed high-pressure air is blown to the edge We of one end of the fabric W, by The end edge We of one end of the circular fabric W is folded back downwards, so as to assist the introduction between the guide plate 71 and the ruler body 72.

The high-pressure air supplied to the remaining air pipe 73 is sprayed from the inner side of the ruler body 72 along the lower surface of the guide plate 71, and the end edge of the fabric W overlapping the lower surface of the guide plate 71 is moved to the left. The force acts to overlap the other part of the fabric with a width corresponding to the length of the guide plate 71, and the circular fabric W in a state of overlapping with a fixed width is fed to the needle drop position for stitching.

The horizontal cylindrical double chain stitch sewing machine M is provided with a fabric guide 8 at a position (front position) on the upstream side (front position) of the sewing travel direction Y than the fabric end edge folding guide device 7 described above. The fabric guide 8 has a circular fabric The fabric end edge guide surface 8A, which is in sliding contact with one end side edge We of the W, guides one end side edge We of the circular fabric W toward the aforementioned fabric end edge folding guide device 7 to move. The fabric guide 8 is provided with: first to third fabric end edge position detectors 10A, 10B, 10C; air ejection pipes 13A, 13B, 13C as first to third air ejection devices; and a lower fabric guide The member 8B is in sliding contact with the end edge WSe of the edge stitched portion WS, and guides the edge of the edge stitched portion WSe toward the second fabric end edge position detector 10B.

As shown in Figure 2, the fabric guide 8 has four support plates 82, 88, 89, 90 fixedly connected to each other along the sewing travel direction Y, wherein a fabric bracket 85 is installed on the support plate 82, and the support plate 88 Fabric brackets 83 and 84 are installed on it. A support rod 81 extending from the support plate 88 in the right lateral direction orthogonal to the sewing progress direction Y is slidably movably pierced and supported by the fixed slider portion 86, and a connecting plate 87 is fixed at the end, and the connecting plate 87 The above is connected with the needle cylinder which is not shown in the figure. Thereby, the said fabric guide part 8 is comprised so that it may drive-move in the left-right direction L-R via a forward-moving needle cylinder. The support plate 82 is a flat plate that is installed in a vertical posture with the support rod 81. The left side surface of the support plate 88 to which the fabric brackets 83 and 84 are mounted is formed on the fabric edge guide surface 8A. The fabric brackets 83, 84, 85 include round pipes or round rod members that are bent into a Japanese character shape like "つ". As described above, the fabric bracket 85 is mounted on the support such that the curved part of the front end extends to the left. The plate 82, the fabric support 83 is installed on the support plate 88 in such a way that the above-mentioned one end passes through the support plate 88 from the support plate 82, and the bending part of the front end of the other end extends to the left. The fabric support 84 extends to the left with the bending part It is installed on the support plate 88 mentioned above. In addition, the lower fabric guide member 8B is attached to the support plate 90 of the fabric guide 8.

The fabric support 83 is arranged along the lower edge near the lower edge of the support plate 82 that is inclined downward in the front. The fabric bracket 84 has a narrower width and a shorter size than the fabric bracket 83, and is arranged at a position close to the upper side of the fabric bracket 83 so as to be stored inside. In addition, the fabric support 85 is wider and longer than the fabric support 83, and is arranged to be away from the front and upper sides of the fabric support 83. The upper edge portion 85a of the fabric support 85 is formed in an inclined posture that is positioned rearward as it goes to the right.

The first air ejection pipe 13A provided in the fabric guide 8 has the function of adjusting one end of the circular fabric W to a predetermined position by the following fabric end edge position adjustment mechanism H (refer to FIG. 1). Air is ejected from the vicinity of the fabric portion, and one end side edge We of the circular fabric W is pressed and held on the fabric guide surface 8A. The second air ejection pipe 13B has a function of ejecting air in conjunction with the position adjustment operation of the end edge portion We of the circular fabric W by the aforementioned fabric end position adjusting mechanism H, thereby assisting in performing the circular fabric W The position of one end edge We pressed against the fabric end edge guide surface 8A of the fabric guide 8 is adjusted. In addition, the third air ejection pipe 13C has a function of intermittently ejecting air toward one end side edge of the placed circular fabric W, and correcting the end side portion of the circular fabric W due to the weight of the fabric. The resulting flexure, wrinkle or curl. These air ejection pipes 13A, 13B, and 13C are connected to an air supply source (not shown) via an air pipe (not shown).

In addition, the first fabric end edge position detector 10A provided in the fabric guide 8 is installed at the upper position of the fabric guide 8 to detect the position of the edge We at one end of the circular fabric W. The second fabric edge position detector 10B is arranged on the upstream side of the sewing travel direction Y than the first fabric edge position detector 10A, and on the left side of the sewing machine body than the first fabric edge position detector 10A The position of the horizontal outer side is to detect the downstream part near the edge position of the edge seam part WS of the circular fabric W sewn by the sewing part. In addition, the third fabric edge position detector 10C is arranged on the upstream side of the sewing traveling direction Y than the second fabric edge position detector 10B, and is closer to the sewing machine body than the first fabric edge position detector 10A. The position of the left side and the outer side, which detects the position of the edge We of one end of the circular fabric W.

The double-needle double chain stitch sewing machine M as the main body of the sewing machine with the above-mentioned structure is provided with a fabric end edge position adjustment mechanism H which is different from the sewing machine M. As shown in Figure 1, the fabric end edge position adjustment mechanism H has the other end holding device 14 of the fabric, which is arranged at the upstream of the sewing travel direction Y than the needle drop portion of the needle plate 6 of the sewing machine M. Side, and a position away from the sewing machine M to the left and laterally outside in a direction substantially orthogonal to the sewing travel direction Y, including the other end that can hold the circular fabric W sewn by the sewing machine M, which is opposite to one end One pair of holding pieces, and one pair of holding parts of the holding tool 14 at the other end of the fabric can be opened and closed. In addition, the fabric other end holder 14 is configured to adjust the position of one end side edge of the circular fabric W in the left-right direction orthogonal to the sewing traveling direction Y by including a stepping motor and gears. The drive unit 15 such as the bar and pinion can reciprocate in the vertical tilt direction (specific direction). Based on the detection result of the first fabric edge position detector 10A, it is driven and moved diagonally downward via the control unit, And based on the detection result of the third fabric edge position detector 10C, the movement control is driven diagonally upward via the control section. The fabric end edge position adjustment mechanism H is fixedly installed on the same sewing machine table as the double needle double chain stitch sewing machine M of the sewing machine body via the stand 16.

Next, referring to FIGS. 5 to 7 on one side, and on the other side, the edge of the circular fabric with the double needle horizontal cylindrical double chain stitch sewing machine M of this embodiment and the fabric end edge position adjusting mechanism H constructed as described above The sewing operation of edge stitching the edge part of the round fabric W such as the bottom part of the T-shirt with the edge sewing machine will be described.

Before sewing starts, the other end holder 14 of the fabric end edge position adjustment mechanism H is positioned in the middle of the upward and downward inclined reciprocating movement path, and the other end portion Wb of the circular fabric W is inserted into the other end holder 14 of the fabric The pair of holding pieces is stopped between the pair of holding pieces, thereby holding the other end Wb of the above-mentioned circular fabric W. In this state, as shown in FIG. The end edge portion We is introduced into the above-mentioned fabric folding guide device 7, and one end edge portion of the circular fabric W is folded back to the back side of the fabric and overlapped, and the folded fabric portion (sewn portion) is placed on the needle plate 6 . After that, the pressing metal member 5 is driven down, and the edge portion We on the upstream side in the sewing traveling direction Y is placed at a predetermined position of the fabric guide 8.

In this state, the horizontal cylindrical double chain stitch sewing machine M is started to rotate, whereby one end of the circular fabric W is supported by the fabric holders 83, 84, and 85 of the fabric guide 8 and sent out. , The guide plate 71 of the fabric folding guide device 7 and the ruler body 72 are introduced, and the edge portion of the one end side is folded back toward the back side of the fabric and overlapped. Then, the fold-back portion of the circular fabric W that is overlapped up and down acts on the fabric downward conveying tooth on the bottom surface of the fold-back amount, and the pressing metal member 5 acts on the upper surface to intermittently force the sewing in the direction of travel Y. It is transferred, and a series of sewing operations such as the up and down movement of the left and right needles 4 and 4 accompanying the rotation of the sewing machine M, the advance and retreat movement of the hook, etc., are performed on the entire circumference of the sewing part of the circular fabric W (overlapping fabric part) Edge stitching forming a double chain stitch.

When sewing the edges as described above, the fabric holders 83, 84, 85 of the fabric guide 8 are supported and sent out to move to the edge position of one of the ends of the circular fabric W of the fabric folding guide device 7. The central part of the circular fabric located between the sewing machine M and the fabric end edge position adjustment mechanism H is displaced in the left-right direction by external forces such as its own weight.

In this case, according to the edge sewing machine of this embodiment, the edge position of one end of the circular fabric W is always monitored by the first fabric edge position detector 10A, based on being sent to the fabric edge folding guide device 7 The detection operation of one end side edge We of the circular fabric W shifted to the left and away from the detection range (projection light receiving range) of the first fabric edge position detector 10A, and the position of the fabric edge is adjusted The holding tool 14 at the other end of the fabric of the mechanism H is driven and moved obliquely downward.

Thereby, the position of one end side edge We of the circular fabric W can be automatically adjusted to a predetermined position over its entire length, and the folding width of the one end side edge We can be kept substantially constant, so that appropriate and Good edge stitching.

Then, when the edge stitching progresses and the downstream part near the position of the edge WSe of the edge stitching moves to the fabric guide member 8B below the fabric guide 8, the edge WSe of the edge stitch is in sliding contact with the fabric guide member 8B While moving, the downstream portion near the edge position of the edge stitching portion is detected by the second fabric edge detector 10B, and based on the detection result, the edge stitching is continued and the fabric guide portion 8 is routed through the omitted illustration. Move the needle cylinder to a predetermined position on the left side of the sewing machine body in the left and right direction LR, so that the beginning end of the edge stitching part and one end of the circular fabric fed into the sewing part in a half-folded state The edge (the end of the edge stitching part) is aligned in a substantially straight line, and the edge of the edge stitching part can be prevented from being folded back again based on the detection result of the first fabric edge position detector 10A. , So that it can perform beautiful edge stitching throughout the entire circumference of the hem.

Moreover, it goes without saying that during the process of aligning the starting end of the edge stitching part WS and the end part of the edge stitching part WS, after the positional alignment is completed, the edge stitching of a predetermined length is continued, Stop the sewing machine drive and switch to the manual sewing state of the operator. This can shorten the edge stitching distance of manual sewing as much as possible. Although it is manual, the beginning and end of the edge stitching can be carried out reliably, easily and quickly. The position is aligned.

In particular, as in the present embodiment, the first to third air ejection pipes 13A, 13B, and 13C are provided in the fabric guide 8 so that the pressure of one end side edge We of the circular fabric W toward the fabric guide surface 8A can be exerted. Retaining function, assisting the position adjustment action of pressing one end edge portion We of the circular fabric W against the fabric end edge guide surface 8A of the fabric guiding portion 8, correcting the end side portion of the circular fabric W due to the weight of the fabric, etc. The function of bending, wrinkling or crimping is generated, so that the required edge stitching can be performed more reliably and appropriately.

Furthermore, in the above embodiment, the fabric other end holding tool 14 of the fabric end edge position adjustment mechanism H is configured to be capable of reciprocating driving movement in the up-and-down oblique direction, but the following form may also be adopted, namely, It is configured to be capable of reciprocating driving movement in the vertical and vertical directions, and is configured to be capable of reciprocating driving movement in the horizontal direction.

In addition, as a sewing machine with the aforementioned fabric end edge position adjustment mechanism H, it is not limited to the aforementioned multi-needle horizontal cylindrical double chain stitch sewing machine, and it can also be used to form a hemming stitch on the entire circumference of the overlapping portion of one end of the circular fabric The stitching sewing machine.

Furthermore, in the above embodiment, the fabric other end holder 14 of the fabric end edge position adjustment mechanism H is described to be configured so that a pair of holding pieces can be opened and closed freely. However, the pair of holding pieces may be moved away from each other to approach The ground swings to drive opening and closing, and it can also be in the form of a pair of springs.

1: Sewing machine leg post 2: Sewing machine arm 3: Sewing machine head 4: needle 5: Fabric pressing metal parts 6: Needle plate 7: Fabric end edge folding guide device 8: Fabric guide 8A: Fabric edge guide surface 8B: Lower fabric guide member 10A: The first fabric edge position detector 10B: The second fabric edge position detector 10C: The third fabric edge position detector 13A: First air ejection pipe 13B: Second air ejection pipe 13C: The third air outlet pipe 14: Holder at the other end of the fabric 15: Drive 16: stand 71: guide board 72: Ruler Body 73: Air piping 81: support rod 82: support plate 83: Fabric bracket 84: Fabric bracket 85: Fabric bracket 85a: (of the fabric support) upper part 86: fixed slider 87: Link plate 88: support plate 89: support plate 90: support plate M: Double chain stitch sewing machine (sewing machine body) H: Fabric end edge position adjustment mechanism W: Round fabric We: one end side of the round fabric WS: Edge seam WSe: Edge of edge stitching Y: sewing direction

[Fig. 1] It is a schematic perspective view of a circular fabric edge sewing machine based on a double-needle horizontal cylinder double chain stitch sewing machine according to an embodiment of the present invention. [Figure 2] is an enlarged perspective view of the main parts of the above-mentioned edge sewing machine, namely the fabric guide and the fabric end edge folding guide device. [Figure 3] is a perspective view of the main part of the above edge sewing machine in a further enlarged state. [Fig. 4] An enlarged perspective view showing the main part of the detailed structure of the fabric guide of the edge sewing machine. [Figure 5] A perspective view showing the main part of the state where the circular fabric is placed on the edge sewing machine. [Figure 6] An enlarged perspective view of the main part of the folding-back guiding action state of one end of the circular fabric of the above-mentioned edge sewing machine viewed from the front. [Fig. 7] An enlarged perspective view of the main part of the state when the end edge of the edge stitching part of the circular fabric of the above edge sewing machine moves to the fabric guide part, viewed from the front.

1: Sewing machine leg post

2: Sewing machine arm

3: Sewing machine head

14: Holder at the other end of the fabric

15: Drive

16: stand

M: Double chain stitch sewing machine (sewing machine body)

H: Fabric end edge position adjustment mechanism

Claims (9)

An edge sewing machine for circular fabrics, with: The sewing part has a needle plate that guides the circular fabric to be conveyed in the sewing travel direction, a needle that can be moved up and down by the needle drop formed on the needle plate, and a fabric pressing metal piece that can be raised and lowered; The fabric end edge folding guide device is arranged at a position on the upstream side of the sewing traveling direction than the needle drop part of the sewing part, so that one end edge of the circular fabric spans a predetermined width and is folded back down and overlapped up and down. Send out guide toward the sewing part; and The fabric guide part is arranged at a position on the upstream side of the sewing traveling direction than the above-mentioned fabric end edge folding guide device, and has a fabric end edge guide surface that is in sliding contact with one end side edge of the circular fabric to guide the circular fabric The side edge of one end part moves toward the forwarding movement of the guiding device for folding back the fabric edge; and The folded part of the circular fabric that is fed and guided from the fabric end edge folding guide device toward the sewing part is stitched on the sewing part. The edge sewing machine for the circular fabric is characterized by: The fabric end edge position adjustment mechanism, which has the other end holding device of the fabric, the other end holding device of the fabric is arranged on the upstream side of the sewing traveling direction than the needle drop portion and facing the sewing machine body in the direction orthogonal to the sewing traveling direction The position of the lateral outer side of the fabric can hold the other end side of the circular fabric, and the fabric end edge position adjustment mechanism is configured to be able to reciprocate and move the fabric other end holder in a specific direction to hold the circular fabric One end edge is placed in a direction orthogonal to the sewing direction for position adjustment; A first fabric end edge position detector, which is arranged above the fabric guide portion, and detects the edge position of one end of the circular fabric; The second fabric edge position detector is arranged on the upstream side of the sewing traveling direction than the first fabric edge position detector and perpendicular to the sewing traveling direction than the first fabric edge position detector A position closer to the lateral outer side of the sewing machine body in the direction, detecting the downstream part near the edge of the sewing part of the circular fabric sewn in the sewing part; and The control section adjusts the position of the one end side edge of the circular fabric to a predetermined position based on the detection result of the first fabric edge position detector on the end edge position of the round fabric. The edge position adjustment mechanism is driven to move in one of the above-mentioned specific directions. On the other hand, based on the detection result of the second fabric edge position detector on the downstream part near the edge position of the edge seam part of the circular fabric, it continues to perform Edge stitching and moving the above-mentioned fabric guide in a direction orthogonal to the sewing travel direction to a predetermined position close to the lateral outer side of the sewing machine body, and then passing the edge stitching spanning a predetermined length to stop the sewing machine driving. For example, the edge sewing machine for circular fabrics in claim 1, which is composed of: On the upstream side of the sewing traveling direction than the second fabric edge position detector, and on the laterally outer side of the sewing machine body in the direction orthogonal to the sewing traveling direction than the first fabric edge detector , Is equipped with a third fabric end edge detector for detecting the position of one end side edge of the circular fabric, and when the third fabric end edge detector detects one end side edge of the circular fabric, the control section will The position of one end side edge of the circular fabric is adjusted to the non-detection position of the third fabric edge position detector, and the fabric end edge position adjustment mechanism is driven to move in the other direction of the specific direction. Such as the edge sewing machine of circular fabric of claim 1 or 2, in which, The fabric guide portion is on the upstream side of the sewing travel direction than the third fabric edge detector, and closer to the main body of the sewing machine than the third fabric edge detector in the direction orthogonal to the sewing traveling direction. A fabric guide member is provided at a laterally outer position. The fabric guide member slides in contact with the edge of the circular fabric edge stitching portion and guides the edge stitching edge to move toward the second fabric edge position detector. Such as the edge sewing machine of circular fabric of claim 1, in which, An air ejection device is provided on the fabric guide portion. The air ejection device ejects air near one end edge of the circular fabric whose position is adjusted to a predetermined position, thereby directing one end edge of the circular fabric toward the fabric guide portion. The guide surface of the fabric end is pressed against. Such as the edge sewing machine of circular fabric of claim 1, in which, An air ejection device is provided on the fabric guide portion, and the air ejection device ejects air in conjunction with the position adjustment action of the fabric end edge position adjustment mechanism to adjust the position of one end edge of the circular fabric, thereby removing one end of the circular fabric. The edge portion presses against the fabric edge guide surface side of the fabric guide portion. Such as the circular fabric edge sewing machine of claim 4, of which, An air ejection device is provided on the fabric guide portion, and the air ejection device ejects air in conjunction with the position adjustment action of the fabric end edge position adjustment mechanism to adjust the position of one end edge of the circular fabric, thereby removing one end of the circular fabric. The edge portion presses against the fabric edge guide surface side of the fabric guide portion. Edge sewing machine for circular fabrics of any one of 4, 5 and 6, in which: An air ejection device for curl correction is arranged in the fabric guide portion. The air ejection device for curl correction intermittently blows air toward one end side edge of the circular fabric before reaching the fabric guide portion to correct the The crimp produced by one end of a circular fabric. Edge sewing machine for circular fabrics in any of 2, 4, of which, The fabric end edge position adjustment mechanism is configured to drive the other end holder of the fabric in the up-down direction or the up-and-down direction based on the detection result of the first fabric end edge position detector on the end side edge position of the circular fabric mobile. Such as the circular fabric edge sewing machine of claim 7, in which, The fabric end edge position adjustment mechanism is configured to drive the other end holder of the fabric in the up-down direction or the up-and-down direction based on the detection result of the first fabric end edge position detector on the end side edge position of the circular fabric mobile.

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