JP4025846B2 - Automatic sewing machine detachment detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic sewing machine that feeds a long fabric, such as a curtain, with a belt conveyor or the like, and sews it with a sewing machine. In particular, the folded portion of the fabric end of the fabric is linear inside the end of the fabric main body. The present invention relates to a sew-off detection device that is attached to an automatic sewing machine that sews seam and detects a sew-off of a seam.
[0002]
[Prior art]
For example, when sewing the hem of the curtain, the curtain hem is folded into three windings having a width of about 75 to 120 mm, and the inner portion of the three windings is sewn about 2 mm from the edge of the fabric body. The top part of the curtain (upper side) is sandwiched between fabrics folded in the same width as the interlining, with a width of about 75 to 100 mm, which is made of polyester or the like, and the edge of the fabric itself. Sew the inner part about 2mm from In addition, the celestial part is creased at the position where the hook is to be applied in the subsequent process. As described above, in the case of the curtain, the hem portion and the top portion are sewn in a straight line by about 2 mm inside a folded portion having a width of about 75 to 120 mm as a sewing operation.
[0003]
And when performing the operation | work which sews the folding part of the cloth | dough edge part of cloths including such a curtain linearly inside the edge by the side of the cloth | dough main body with a conventional general sewing machine, The fabric was folded by hand and sent to the sewing machine, and sewing was performed while visually checking the sewing state.
[0004]
On the other hand, an automatic sewing machine has been developed that automates the operation of sewing the folded portion of the fabric end portion of the fabric linearly inside the end edge on the fabric body side. When the automatic sewing machine is used, an operator who operates the sewing machine need only set the cloth fabric to be sewn on the conveyor belt near the entrance of the sewing machine while the set fabric is a conveyor. While being fed by the belt, it is automatically folded into a predetermined shape and sewn by a sewing machine arranged near the exit.
[0005]
[Problems to be solved by the invention]
However, such an automatic sewing machine is usually provided with a conveyor belt before and after the needle position of the sewing machine, and the position of the needle cannot be seen directly from the position of the operator who is setting the fabric. It was difficult to sew while visually checking the condition. Although it is possible to install a reflecting mirror or the like so that the sewing position can be seen, even in such a case, since the operator is busy setting the fabric, the sewing state cannot be sufficiently monitored. For this reason, it has been difficult to find the case where sewing is not performed correctly due to thread breakage, needle breakage, or the like.
[0006]
In particular, when the sewing machine of the automatic sewing machine is a main sewing machine, the bobbin thread wound on the dedicated bobbin is consumed along with the sewing work. With a normal main sewing machine, for example, the curtain is continuously sewn only about 50 m. Can not. The sewing machine does not stop even if the lower thread runs out, and only the upper thread entangles with the fabric as it is, but it still seems to be sewn when viewed from the front side.
[0007]
Therefore, when sewing long fabrics such as curtains, the counter linked with the sewing machine is reset when the bobbin of the lower thread is replaced so that thread breakage does not occur in the middle, and the set distance (or rotation of the sewing machine) When sewing only a few), an alarm has been issued or the sewing machine has been stopped. However, with this method, the consumption distance of the lower thread varies depending on the thickness of the fabric used and the type of thread, and the distance that can be sewn changes. Had to be replaced. The remaining lower thread was unwound from the bobbin and discarded, and then the bobbin had to be wound around again, resulting in a lot of wasted thread and wasted time. In addition, even if measures can be taken for the lower thread, it is difficult to detect if the upper thread breaks, which may be caused by a sewing failure in a sewing machine other than the main sewing machine or a broken needle other than thread breakage. It was difficult to find defective sewing.
[0008]
The present invention has been made in view of the above problems, and is attached to an automatic sewing machine for sewing a fabric such as a curtain, and in particular, the folded portion of the fabric end portion of the fabric is linearly formed inside the end of the fabric main body side. When sewing with the sewing machine is not performed normally, i.e., when the stitches are shifted from the predetermined sewing position, the thread is broken, the thread is consumed, the needle is worn, etc. Another object of the present invention is to provide a sew-off detection device that can automatically detect and detect a sewing failure at an early stage.
[0009]
[Means for Solving the Problems]
The automatic sewing machine sewing detection device according to the present invention is attached to an automatic sewing machine that linearly sews a fabric folded portion of a fabric such as a curtain on the inside edge of the fabric main body, and detects a seam disengagement. This is a sewing disengagement detecting device that is provided so as to come into contact with a seam that moves as a result of sewing, and that includes a contact that detects the disengagement by detaching from the locus of the seam.
[0010]
The sewn-off detection device is installed so that the contact comes into contact with the seam that moves as the sewing is performed, and detects the sewn-off by moving out of the locus of the seam. For this reason, when sewing fabrics such as curtains with an automatic sewing machine, especially when the folded portion of the fabric end of the fabric is sewed linearly inside the edge of the fabric body, sewing with the sewing machine is performed normally. It is possible to automatically detect a sewing disengagement when it is not detected and to detect a sewing failure at an early stage, and can be used to issue an alarm to the operator or automatically stop the sewing machine.
[0011]
In particular, the contact is urged by the urging means so that the contact is parallel or substantially parallel to the fabric surface of the fabric sewing portion and is movable in a direction perpendicular to the sewing machine traveling direction, and comes into contact with the seam from the fabric body side. It is good to be. By doing so, the contactor can be inserted from the fabric body side into the inside of the edge that slightly opened outside the seam of the sewing part that has been sewn by folding the fabric, and can be brought into contact with the seam easily. In addition to being able to make stable contact with the moving seam, if the sewing machine is not sewn correctly due to bobbin thread breakage etc., the contact will be pushed beyond the locus of the seam, and this will be detected and the sewing will be disengaged. Can be reliably detected.
[0012]
For example, a spring is suitable as the biasing means. In addition, a pneumatic cylinder or the like may be used.
[0013]
In addition, the sewing-separation detecting device includes an actuator capable of forcibly moving the contactor against the urging force of the urging means so as to be separated from the fabric seam and retracted to the fabric body side. Is good. By doing so, the contactor can be moved away from the fabric body side after the seam is formed by moving the contactor away from the sewing start, and the contactor can be moved away from the fabric body side to prevent false detection. You can
[0014]
For example, a pneumatic cylinder is suitable as the actuator. In addition, a solenoid or the like may be used.
[0015]
Further, the contact is preferably plate-shaped, has a spring force, and is installed so as to press the fabric surface by the spring force. By doing so, it can be smoothly inserted in contact with the fabric surface from the fabric body side to the inside of the edge that slightly opened outside the seam of the sewing part, and can be easily brought into contact with the seam. Accordingly, it is possible to prevent the seam from being lifted in a direction away from the moving seam and to stably contact the seam.
[0016]
The contact may move in parallel to the fabric surface of the fabric sewing portion and in a direction perpendicular to the sewing machine traveling direction, for example, by swinging in parallel with the fabric surface of the fabric sewing portion.
[0017]
More specifically, the contact is supported by, for example, a swing arm that can swing in parallel with the fabric surface of the fabric sewing portion, and the swing arm serves as the first biasing means. And the contact itself can be swung in a direction perpendicular to the fabric surface of the fabric sewing portion, and may be urged by the second urging means in a direction contacting the fabric surface. .
[0018]
In this case, the contactor itself can swing in a direction perpendicular to the fabric surface of the fabric sewing portion, and is biased by the second urging means in the direction in contact with the fabric surface, so that various thicknesses of the fabric can be obtained. It is also possible to cope with the change in thickness at the seam portion when sewing the joined fabric. For example, in the case of a curtain, it is common to take a crease and attach a hook and hang it on a window or the like, and in that case, it is made of a cloth having a width of 2 to 3 times the width of the suspended window or the like. However, the width of the fabric is about 1 m to 1.5 m, while the width of the window is 1 m to 4 m. For this reason, curtain fabrics are often produced as wide fabrics by joining together the original fabrics. Therefore, the contact is difficult to use for sewing a wide range of products such as curtains unless the joint of the fabric can pass through. In such a case, as described above, it is necessary for the contactor itself to be able to swing in the direction perpendicular to the fabric surface of the fabric sewing portion and to be urged by the second urging means in the direction in contact with the fabric surface. is there. In the case of curtains, as described above, both the three-winding part of the hem part and the sewing part of the interlining of the top part are sewn at a portion of about 2 mm from the end of the folded part, and therefore have similar contacts. It is possible to detect an unsewn portion with a detection device.
[0019]
In this case, the detachment detecting device includes a proximity switch that detects an approach caused by the swing of the swing arm, and detects that the contact has deviated from the locus of the seam by the proximity switch. It's okay.
[0020]
Further, the contact is moved in a direction substantially parallel to the fabric surface of the fabric sewing portion and at a right angle with respect to the sewing machine traveling direction by rotating on a rotation locus having the fabric surface of the fabric sewing portion as a tangential direction. There may be. More specifically, the contact in that case is supported by, for example, a rotating arm that rotates about a central axis parallel to the fabric surface of the fabric sewing portion, and the rotating arm is a first biasing means. The contact itself can swing in a direction substantially perpendicular to the fabric surface of the fabric sewing portion, and is urged by the second urging device in a direction in contact with the fabric surface. It may be. In this case, the sewn-off detection device includes a proximity switch that detects an approach due to an approaching rotation caused by a rotation of a protrusion on the radially extending portion of the rotating arm, and the contact switch causes the contact to be connected to the seam. It may detect that it deviates from the locus.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
1 to 5 show an unsewing detecting device for an automatic sewing machine according to an example of an embodiment of the present invention. 1 is a single perspective view, FIG. 2 is a plan view of the automatic sewing machine attached to the automatic sewing machine, FIG. 3 is a side view of the automatic sewing machine attached to the automatic sewing machine, and FIG. 4 is a front view of the automatic sewing machine attached to the automatic sewing machine. 5 is an operation explanatory diagram.
[0023]
1 to 5, reference numeral 1 denotes a detachment detection device. 2 is a sewing machine of an automatic sewing machine, 3 is a table, 4 and 5 are belt conveyors, 6 is a frame, 7 is a belt presser roller, and 8 is a fabric presser roller. 10 indicates the needle position of the sewing machine 2.
[0024]
The sewn-off detection device 1 is arranged in front of the sewing machine 2 of the automatic sewing machine (front of the sewing machine traveling direction), and from the needle position 10 when viewed from the sewing machine traveling direction (direction from right to left in FIG. 2). A mounting bracket 11 attached to the frame 6 of the automatic sewing machine on the right side, and a fixed arm extending substantially horizontally from the rear end side (the right end side in FIG. 2) of the mounting bracket 11 to the left side from the needle position 10 when viewed from the machine traveling direction. 12, a swing arm 14 supported by a support shaft 13 substantially perpendicular to the fixed arm 12 and swingable in a substantially horizontal plane parallel to the surface of the table 3, and the swing arm 14 up and down The upper end of the oscillating arm 14 is constrained in the width direction of the oscillating arm 14 and movably moved in the longitudinal direction, and is supported by a substantially horizontal support shaft 16 in the longitudinal direction of the oscillating arm 14. Supporting arm capable of swinging in a substantially vertical plane including the axis 17, a spatula-shaped plate-like contact 18 fixed to the support arm 17 and capable of swinging integrally with the support arm 17 in a direction perpendicular to the surface of the table 3, and standing on the swing arm 14. The first spring 20 (first urging means) that is stretched between the pin 19 and the mounting bracket 11 and urges the swing arm 14 toward the mounting bracket 11, and stands on the upper end of the support arm 17. The second pin 21 is stretched between the pin 21 provided and the pin 22 inserted into the swing arm 14, and biases the contact 18 against the surface of the table 3 via the support arm 17. The spring 23 (second biasing means) and the swing arm 14 were fixed to the mounting bracket 11 so as to be able to forcibly move in the direction perpendicular to the sewing machine traveling direction against the biasing force of the first spring 20. Needle position 10 from the pneumatic cylinder 24 and the front end side of the mounting bracket 11 (left end side in FIG. 2) when viewed from the direction of sewing machine travel A sensor bracket 25 that extends substantially horizontally to the left side, and a proximity switch 27 that is attached to the sensor bracket 25 and detects the movement of the contactor 18 toward the mounting bracket 11 beyond a predetermined position by a protrusion 26 on the swing arm 14 It consists of and.
[0025]
As shown in FIG. 2 to FIG. 4, the sewing detachment detecting device 1 is attached to a frame 6 of an automatic sewing machine by a mounting bracket 11. When the cloth folding portion of the fabric such as a curtain is sewed linearly inside the edge of the fabric main body by the automatic sewing machine, the contact 18 comes into contact with the seam that moves along with the sewing, and the seam A slip-off is detected by deviating from the locus. FIG. 5 shows the operation. In FIG. 5, 30 is a curtain fabric, 30a is a folded portion on the hem or top side, and 30b is a fabric body. Reference numeral 31 denotes a joint portion of the fabric, and 32 denotes a perforation.
[0026]
The curtain fabric 30 advances in the arrow direction (sewing machine traveling direction) in FIG. Then, the contact 18 is retracted to the fabric main body 30b side as shown in FIG. 5 (a) by operating the pneumatic cylinder 24 and pushing the swing arm 14 at the position where the curtain fabric 30 starts. Extruded into position.
[0027]
When the seam 3 comes, the pneumatic cylinder 24 moves backward, and the swing arm 14 is pulled by the first spring 20, so that the contact 18 is folded over as shown in FIG. It enters through the gap at the end of the sewing part) and contacts the seam 32.
[0028]
When the joint portion 31 of the curtain fabric 30 comes, the contact 18 is pushed upward by the thickness of the joint portion 31 as shown in FIG. 5C, and is bent by its own spring action. It swings against the biasing force of the spring 23 and lifts up substantially vertically to pass the joint portion 31.
[0029]
If thread breakage or the like occurs during sewing, the contact 18 is detached from the perforation 32 and pulled by the first spring 20 when a portion that is not properly sewn due to the thread breakage or the like comes. As shown in FIG. 5 (d), it goes into the folded portion 30a. Then, the proximity switch 27 works to detect a thread break.
[0030]
The first spring 20 may be replaced with a pneumatic cylinder or the like, and the second spring 23 may be replaced with a pneumatic cylinder or the like. The pneumatic cylinder 24 may use a solenoid or the like instead.
[0031]
Further, the contact 18 may be one that moves in parallel instead of swinging, and may be one that is rotated by a disk.
[0032]
Further, in the above-described sewing disengagement detecting device 1, the swing arm 14 is supported by a support shaft that is substantially perpendicular to the fixed arm 12, and can be swung by the swing arm 14 by a substantially horizontal support shaft 16. The contact arm 18 is fixed to the support arm 17, the contact 18 is fixed to the support arm 17, and the swing arm 14 swings in a substantially horizontal plane along the fabric surface, so that the contact 18 follows the fabric surface. However, as another example of the embodiment, for example, a rotary arm is supported by a substantially horizontal support shaft on a fixed arm, and the rotary arm Further, a support arm is supported so as to be swingable by a substantially horizontal support shaft whose direction is changed by approximately 90 °, a contact is fixed to the support arm, and the rotating arm is centered on a central axis parallel to the fabric surface. By rotating the contact surface with the fabric surface in a rotation locus with the fabric surface as a tangential direction. Or it may be moved to a direction perpendicular to parallel and sewing direction of travel. In that case, instead of the first spring 20 (first urging means) for urging the swing arm 14 toward the mounting bracket 11 in the above embodiment, the contact of the rotating arm approaches the seam. A spring that urges to rotate in the direction is provided as the first urging means, and instead of the pneumatic cylinder 24 (actuator) that pushes the swing arm 14, the rotation arm is forcibly rotated in the direction in which the contact retracts. Provide an actuator (pneumatic cylinder, etc.) that can be used. Further, in place of the proximity switch 27 for detecting the protrusion on the swing arm 14, a proximity switch for detecting the approach due to the rotation of the protrusion on the radially extending extension of the rotating arm is provided.
[0033]
In the above embodiment, the case where the sewing needle is vertical has been described as an example. However, the sewing-off detection device of the present invention can also be applied to a horizontal sewing machine. When the sewing needle is a horizontal sewing machine, the contact is not horizontal, for example, is vertically contacted with the perforation from above.
[0034]
Moreover, in the said embodiment, although demonstrated centering on sewing of curtain cloth, it cannot be overemphasized that this invention is applicable also to sewing of cloth other than curtain cloth.
[0035]
【The invention's effect】
As is apparent from the above description, the sewn-off detection device of the present invention is attached to an automatic sewing machine that sews fabric such as curtains, and in particular, the folded portion of the fabric end of the fabric is the inner edge of the fabric main body side. When sewing in a straight line, it is possible to detect a sewing failure at an early stage by automatically detecting the sewing failure when sewing is not performed normally, regardless of whether it is a vertical sewing machine or a horizontal sewing machine. it can.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a single unit of a sewing detachment detecting device of an automatic sewing machine as an example of an embodiment of the present invention.
FIG. 2 is a plan view of a state in which a sewing detachment detecting device for an automatic sewing machine as an example of an embodiment of the present invention is attached to the automatic sewing machine.
FIG. 3 is a side view of an automatic sewing machine seizing detection apparatus as an example of an embodiment of the present invention attached to the automatic sewing machine.
FIG. 4 is a front view of an automatic sewing machine as an example of an embodiment of the present invention, in a state in which the automatic sewing machine is attached to the automatic sewing machine.
FIGS. 5A and 5B are operation explanatory views (a), (b), (c) and (d) of a sewing detachment detecting device for an automatic sewing machine as an example of an embodiment of the present invention;
[Explanation of symbols]
1 Sewing-off detection device 2 Sewing machine 3 Table
10 stitch positions
11 Mounting bracket
12 Fixed arm
13 Spindle
14 Swing arm
15 holes
16 Spindle
17 Support arm
18 Contact
20 First spring (first biasing means)
23 Second spring (second biasing means)
24 Pneumatic cylinder
26 Protrusions
27 Proximity switch
30 curtain fabric
30a Folding part
30b Fabric body
31 Seam
32 seams

Claims (12)

A sewing-off detection device that is attached to an automatic sewing machine that linearly sews the fabric folded portion of the fabric on the inner edge of the fabric body side, and detects a seam disengagement,
An automatic sewing machine seizing detection apparatus, comprising a contact that is installed so as to come into contact with a seam that moves as a result of sewing and that detects a seismic disengagement by deviating from the locus of the seam. The contact is parallel or substantially parallel to the fabric surface of the fabric sewing portion and is movable in a direction perpendicular to the sewing machine traveling direction, and is biased by a biasing means so as to contact the seam from the fabric body side. The sewing-separation detecting device for an automatic sewing machine according to claim 1. The automatic sewing machine detachment detecting device according to claim 1 or 2, wherein a spring is used as the urging means. 4. An actuator capable of forcibly moving the contact member against the urging force of the urging means so as to be separated from the seam of the fabric and retracted to the fabric body side. Detachment detection device for an automatic sewing machine as described in 1. 5. The sewing-separation detecting device for an automatic sewing machine according to claim 4, wherein a pneumatic cylinder is used as the actuator. The automatic contact according to any one of claims 2, 3, 4 and 5, wherein the contact is plate-shaped, has a spring force, and is installed so as to hold the fabric surface by the spring force. Sewing machine slippage detection device. 7. The contact according to claim 6, wherein the contact moves in parallel to the fabric surface of the fabric sewing portion and in a direction perpendicular to the sewing machine traveling direction by swinging in parallel with the fabric surface of the fabric sewing portion. Automatic sewing machine sewing detection device. The contact is supported by a swing arm that can swing in parallel with the fabric surface of the fabric sewing portion, and the swing arm is urged by the urging means as the first urging means. 8. The automatic sewing according to claim 7, wherein the sewing machine itself is swingable in a direction perpendicular to the fabric surface of the fabric sewing portion, and is urged by the second urging means in a direction in contact with the fabric surface. Machine sewing detection device. 9. The automatic sewing machine according to claim 8, further comprising a proximity switch that detects an approach caused by swinging of the swing arm, wherein the proximity switch detects that the contact has deviated from a locus of a seam. Sewing detection device. The contactor moves in a direction substantially parallel to the fabric surface of the fabric sewing portion and perpendicular to the sewing machine traveling direction by rotating along a rotation locus having the fabric surface of the fabric sewing portion as a tangential direction. The automatic sewing machine seizure detection device according to claim 6. The contact is supported by a rotating arm that rotates about a central axis parallel to the fabric surface of the fabric sewing portion, and the rotating arm is urged by the urging means as the first urging means. The contact element itself is swingable in a direction substantially perpendicular to the fabric surface of the fabric sewing portion, and is urged by the second urging means in a direction in contact with the fabric surface. Detachment detection device for an automatic sewing machine as described in 1. A proximity switch that detects an approach due to an approaching rotation caused by a rotation of a protrusion on a radially extending extension of the rotating arm, and the proximity switch detects that the contact has deviated from a locus of a seam; An automatic sewing machine seizure detection device according to claim 11.

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