JP4743682B2 - Sewing machine - Google Patents

Description

  The present invention relates to a sewing machine, and more particularly to a means for setting a long sewing product and feeding it to a sewing machine.

  For example, in the case of curtains with folds made by custom-made, the curtains of the cutting process, the splicing process, the hem sewing process, the length adjusting process, the centering process, the laying process, the ear sewing process, the ironing process, and the fold sewing process are performed. Generally, it is manufactured by a series of processes, finished as a final product, packaged and shipped. Of these, sewing machines that automate sewing in the processes of splicing, hem stitching, centering, and laying are usually sewing machine type sewing machines that run the sewing machine while fixing the fabric. In addition, dedicated machines (drawing machines, hem stitching machines, cored machines, and Tenfu machines) were used for each process. In addition, the sewing machine used in the fold stitching process is a sewing machine fixing type, and the sewing machine used in the ear sewing process is usually a sewing machine fixing type.

However, using a separate sewing machine for each sewing process in curtain production in this way requires a large cost for equipment and requires a large space. Therefore, as a curtain sewing machine that can be shared by multiple sewing operations that have been performed with separate sewing machines, the curtain fabric is held in a plurality of clamps that are slidably mounted on the rail, and the sewing machine feed direction with each clamp A sewing machine-fixed compact curtain sewing machine has been proposed and put into practical use (see, for example, Patent Document 1). This curtain sewing machine can be used for sewing hem stitches, lie down and ear stitches in curtain production if a main sewing machine is used, and can perform centering and laying at once, If an interlock sewing machine is used, it is possible to sew a seam and a core, and it can be used for various sewing operations such as a seam, a hem stitch, a centering, and a bottoming, which have been conventionally performed by a separate sewing machine.
JP 2001-198379 A

  However, a sewing machine that holds curtain fabric, etc., on a plurality of clamps installed on a rail so as to be slidable, moves the clamps in the machine feed direction, and automatically releases the clamps in sequence before the sewing machine. The conventional curtain sewing machine of the fixed type cannot structurally drive the clamp itself, but moves the clamp in the machine feed direction via the curtain fabric by the sewing machine (feed). Therefore, in the case of curtain fabric that is easy to stretch, such as boiled fabric, the fabric is stretched due to the weight and catch of the clamp, and the fabric is sewn in a stretched / shrinked state, resulting in suspension, puckering, etc., and finishing accuracy If the rails are shortened due to the installation space, the curtain fabric is not fully expanded. Since it does not fit, it is necessary to move between the clamps each time it is set to each clamp, and there is a problem that the fabric is displaced from the state where it is set between the clamps, and the fabric is aligned by applying tension. However, since the clamp itself is not driven and moves freely on the rail, tension cannot be applied to the fabric, and there is a problem that it is difficult to set the fabric.

  Therefore, it can be shared by multiple sewing operations, it is easy to set the sewing product, long sewing items can be sewn in a compact space, and work efficiency and finishing accuracy are especially suitable for sewing core tape etc. There was a need to develop a good sewing machine.

According to the present invention, two clamps that can be moved back and forth by a driving means are arranged on the side of a work table in front of the sewing machine, and each clamp has a gripping means for gripping a workpiece and a moving mechanism for moving the gripping means. A holding state in which the gripping means is moved to a work position on the work table by the moving mechanism to hold the sewing product and held on the work table; Can be converted into a state, and one of the clamps has a standing position that stands substantially vertically in a direction away from the work table and a horizontal surface that falls in a direction that is substantially horizontal and substantially perpendicular to the machine feed direction and protrudes onto the work table. A swivel type tape guide that can be converted into a position is provided, and one of the clamps provided with the guide is moved to the work position at the set position of the frontmost part of the work table. Supply the fabric to be sewn to the set position, move the guide to the recumbent position, immerse the guide in the tape, supply the tape, and superimpose the leading end of the tape on the fabric first end at the set position; After holding the overlapped material first end and tape tip on the work table by the gripping means of the clamp, the clamp is moved to the sewing position, and the other end of the fabric is clamped at the set position. The clamp that has been gripped by the gripping means and moved to the sewing position releases the fabric and tape and stops at that position, starts the sewing machine, and feeds the clamp that grips the end of the fabric to the sewing machine. Sewing while moving in the machine feed direction according to the speed, the clamp is released at a predetermined position before the sewing position, returned to the set position, and then reattached to the clamp. It constitutes a sewing machine so as to repeat the operation by gripping the fabric end side sewing while moving the sewing machine feed direction to return to the set position at a predetermined position to the fabric end. Here, the tape means a tape-like or sheet-like long object including a core tape sewn to the top of the curtain.

  In this sewing machine, the material to be sewn is supplied to the set position, supplied to the guide provided on one of the clamps, supplied with the tape, the tip of the tape is superimposed on the initial end of the material, and gripped by the gripping means on the work table. The clamp is moved to the sewing position, the end of the fabric is held by the gripping means of the other clamp at the set position, and the clamp that has moved to the sewing position releases the workpiece being sewn. With the sewing machine stopped at that position, the sewing machine is started and the clamp that grips the end of the fabric is sewn while moving it in the machine feed direction in accordance with the machine feed speed, and the clamp is moved to a predetermined position before the sewing position. Release the grip and return to the set position in the retracted state. Sewing while holding the material end side again in the clamp and moving it in the machine feed direction, set at the predetermined position. The operation of returning at repeated until the workpiece end. At this time, the clamp for gripping the dough end side grips the dough at the set position, and then adjusts to the feed speed of the sewing machine by the driving means. Therefore, the conveyor of the feed conveyor (stucking conveyor) installed beside the sewing machine The cloth is moved in the sewing direction in accordance with the speed, and the cloth moves together with the clamp in synchronization with the sewing speed. For this reason, even stretchable fabrics such as boiled fabric do not become stretched or shrunk due to the weight or catch of the clamp, and there is no occurrence of fishing, puckering, etc., and tape sewing with good finishing accuracy can be performed. it can.

  Also, even when the work table is shorter than the fabric length or width, the clamp that grips the fabric end side holds the fabric end side, moves it in the machine feed direction, and sews it back to the set position at the predetermined position. By repeating the above, it is possible to continuously perform sewing with good finishing accuracy without deviation until the end of the fabric. Therefore, it is possible to sew a tape on a long fabric with high accuracy in a compact space.

  Further, this sewing machine can be positioned easily by applying an appropriate tension to the fabric when the fabric end is held by the clamp at the set position and held on the work table.

  In addition, since the clamp of this sewing machine only reciprocates linearly, it is possible to automate the gripping operation by an air type or the like. When setting the cloth or cloth and tape at the set position, the aligned cloth or cloth and tape are aligned. Can be gripped by automatically operating the gripping means without moving the clamp, and the setting of the sewing product becomes much easier.

  And when this sewing machine sets a to-be-sewn product, it can be easily aligned by the operator standing in front of the direction of advance of the machine feed.

  This sewing machine is suitable for performing curtain centering sewing using, for example, an interlock sewing machine.

The sewing machine according to the present invention can easily set a sewing product, can sew a long sewing product in a compact space, has high work efficiency, and good finishing accuracy. And it can be shared by a plurality of sewing operations. The sewing machine of this invention is easy to cloth and a set of tapes is workpiece, can sew the workpiece elongated in a compact space, good working efficiency, good finishing accuracy, in particular, It is suitable for performing curtain core sewing using an interlock sewing machine.

  1 to 4 show a sewing machine as an example of an embodiment of the present invention. 1 is a plan view, FIG. 2 is a front view, FIG. 3 is a left side view, FIG. 4 is a detailed view of a chuck portion on a clamp ((a) is a plan view, (b) is a front view, and (c) is a left side). Is a plan view).

  The sewing machine shown in this example is particularly suitable as a center machine for curtain sewing. Here, the case where it uses as a centering machine is demonstrated. However, it can also be used for purse stitching, hem stitching, bowing and ear stitching.

  This sewing machine (centering machine) has a sewing machine base 2 on which a sewing machine (interlock sewing machine) 1 is mounted, and a work table 3 is arranged in front of the sewing machine in connection with the sewing machine base 2. . Then, on the left side of the work table 3 as viewed from the front, a transport conveyor 4 having a length of about 2 m for moving the entire fabric in the sewing machine direction is disposed. A space 5 is provided between the conveyor 4 and the work table 3. The space 5 can be arbitrarily set according to the position of the conveyor 4.

  A presser bar 6 is provided above the transport conveyor 4 for pressing the cloth that is the sewing object. The presser bar 6 can be moved up and down by a presser lifting cylinder 7.

  On the right side of the work table 3, two rails (LM guides) 8 on the rail and 9 on the bottom of the rail are installed in parallel along the sewing machine feed direction. One upper clamp 10 is slidably arranged, and one lower clamp 11 is arranged on the lower rail 9 slidably back and forth.

  Each of the upper clamp 10 and lower clamp 11 has an automatic chuck 12 (gripping means) that is operated by air, and the chuck 12 is moved to a work position on the work table 3 to grip the cloth. Elevating and lowering and moving left and right sliding so as to be convertible between a holding state held on the work table 3 and a retracted state in which the holding state is released and the other clamp is retracted at a retracted position that does not interfere with the forward / backward sliding movement It has a left / right slide mechanism 13 (moving mechanism).

  Although not shown, a timing belt is disposed on the back of the sewing machine in parallel with the rail 8 and a timing belt is disposed in parallel with the rail 9 and the clamp upper 10 and the timing belt are respectively disposed on the timing belt and the timing belt. The lower clamp 11 is connected. The upper drive means 16 and the lower drive means 17 composed of servo motors are installed above and below the frontmost part of the work table 3 (right side in the front view). The clamp drive system is configured such that the upper clamp 10 and the lower clamp 11 slide on the upper rail 8 and the lower rail 9 via the upper belt 14 and the lower timing belt 15, respectively. In the clamp drive system, although not shown, an origin position sensor and an origin position sensor are disposed at the frontmost part on the back side, and an advance limit sensor and an advance limit sensor are disposed at a position immediately before the sewing machine. .

  Also, on the left side of the sewing machine 1, a feed conveyor (also referred to as a scraping conveyor) 22 is arranged to feed (scratch) the first end of the fabric to the sewing-needle presser and to press and feed the fabric being sewn. A leading roller 23 is disposed behind the sewing machine 1. In addition, a cloth detection sensor (not shown) is disposed inside the sewing machine 1 in front of the sewing needle.

  A laser marker 25 for irradiating the inter-needle position is arranged above the work table 3 as a mark for alignment when setting the fabric.

  In addition, an end detection sensor 26 that detects the end of the cloth is disposed at the foremost cloth setting position S (see FIG. 1) of the work table 3.

  The upper clamp 10, which is one of the clamps of the sewing machine, is substantially horizontal and substantially perpendicular to the sewing machine feed direction with the standing position standing substantially vertically in the direction away from the work table 3 as shown in FIG. 4. A turning type tape guide 27 that can be converted into a recumbent position that tilts in the direction of protruding onto the work table, and a drive means 28 constituted by a servo motor that turns the tape guide 27 to turn are provided.

  A tape stand 29 and an intermediate tape guide 30 are arranged above the work table 3.

  Next, a series of operation patterns (1) to (10) for feeding the fabric when the centering operation is actually performed by the curtain sewing machine (centering machine) will be described with reference to FIG.

  (1) When an operation button or an operation foot switch (not shown) is pressed, the chuck 12 on the upper clamp 10 in the set position (origin position) S is moved up and down by the lifting / lowering slide mechanism 13. It is automatically arranged on the work table 3.

  (2) The cloth to be sewn W is supplied to the set position S, the tape guide 27 is moved to the recumbent position, the core tape T (tape) is supplied under the tape guide 27, and the tip of the core tape T is At the set position S, it is overlapped with the first end of the fabric, and the centering sewing position is matched with the irradiation position of the laser marker 25. At this time, the worker M is standing in front of the traveling direction of the fabric (see FIG. 1). Therefore, alignment is easy.

  (3) In this state, the pneumatic chuck 12 is operated to hold the overlapped material initial end and core tape tip and hold them on the work table 3. At that time, the position of the upper clamp 10 is fixed, and the chuck 12 is automatically operated by operating a switch (not shown) or the like. Then, the fabric is set between the conveyor 4 and the presser bar 6 so that the line of the first end of the fabric is aligned with the remaining portion of the fabric W, and the presser bar is pressed by pressing a presser lifting / lowering button (not shown). 6 is lowered. At this time, in order to prevent the fabric W from shifting due to its own weight, the fabric W may be slightly slackened in the space 5 between the work table 3 and the transport conveyor 4. In this state, by pressing an operation button or an operation foot switch (not shown), the upper clamp 10 holding the leading edge of the fabric and the leading end of the core tape is driven by the upper drive 16 and moves in the machine feed direction. . At that time, the conveyor 4 is also activated at the same time and conveys the fabric W at the same speed as the upper clamp 10. Therefore, the entire fabric W moves in the sewing machine feeding direction.

  (4) When the initial end of the fabric W comes before the sewing machine 1, a signal is sent under the forward limit sensor, and the upper clamp 10 and the conveyor 4 are automatically stopped. Then, the feed conveyor (scraping conveyor) 22 disposed on the left side of the sewing machine 1 is lowered, and the presser bar 6 is automatically raised.

  (5) The chuck 12 of the other clamp (under the clamp 11) is automatically arranged on the work table 3 by the lifting / lowering and right / left slide mechanism 13 at the set position S.

  (6) In this state, the fabric W is pulled forward, and is positioned in the same manner as the first end of the fabric in a lightly tensioned state. Hold on.

  (7) The cloth W between the upper clamp 10 and the lower clamp 11 is aligned with the laser marker line as a mark, and a presser lift button (not shown) is pressed to lower the presser bar 6. Then, a driving button or a driving foot switch (not shown) is pressed. Then, the chuck 12 on the upper clamp 10 stopped in front of the sewing machine 1 automatically releases the grip and releases the fabric W and the core tape T.

  (8) And while the upper clamp 10 is stopped at that position, the sewing machine 1, the feed conveyor (scratching conveyor) 22, the transport conveyor 4, and the lower clamp 11 are activated to grip the end side of the fabric W. The lower clamp 11 is driven by the lower drive means 17 and moves in the machine feed direction in accordance with the machine feed speed. The conveyor 4 also conveys the fabric W at the same speed as the lower clamp 11 and the sewing machine 1 cores the fabric W on the fabric W. T is sewn. During sewing, the fabric W moves in synchronism with the sewing machine feed speed, and is further uniformly pulled by the leading roller 23 arranged on the machine feed direction side. Therefore, the fabric W and the core tape T after sewing do not sag, and stable sewing is possible.

  (9) When the lower clamp 11 comes to the front of the sewing machine 1 (before the sewing position), the sewing machine 1, the feed conveyor (scratching conveyor) 22, the conveyor 4 and the lower clamp 11 are automatically stopped by the advance limit sensor. . Then, the lower clamp 11 is released from gripping at a predetermined position before the sewing position and moves in the anti-sewing machine feeding direction.

  (10) Then, the lower clamp 11 stops at the set position S and is automatically placed on the work table 3 so that the next cloth can be set immediately. In this state, the lower end side of the cloth 11 is held again by the clamp 11 and the operations (7) and after are repeated until the end of the cloth.

  By the way, the distance from the clamp advance limit position to the set position S is, for example, 800 mm (this distance can be changed as appropriate), and in this case, the length (length) of the fabric W varies depending on the application. If the operation of (10) is repeated to the end, the end of the fabric W does not always come to the set position. Therefore, in the sewing machine of this embodiment, the end of the fabric is detected by the end detection sensor 26 arranged in the work table 3 at the set position S, and the end of the fabric is always fed automatically so that the end of the fabric automatically stops at the set position S. I try to move to a pattern.

  Next, operation patterns (1) to (9) for feeding the dough end will be described with reference to FIG.

  (1) When the end of the cloth is detected by the end detection sensor 26 while the lower end of the clamp 11 is moving in the sewing machine feed direction while gripping the end of the cloth, the sewing machine 1, the feed conveyor (rake conveyor) 22, the transport conveyor 4, Each of the lower clamps 11 automatically stops.

  (2) Then, the lower clamp 11 is released from the grip and moves in the anti-sewing machine feed direction.

  (3) The lower clamp 11 is automatically placed on the work table 3. Here, the core tape T is cut in accordance with the length up to the end of the fabric, and is stacked on the end of the fabric.

  (4) In this state, the chuck 12 under the clamp 11 is operated to grip the overlapped material end and core tape end, and hold them on the work table 3. At that time, the position of the lower clamp 11 is fixed, and the chuck 12 is automatically operated by an operation of a switch (not shown) or the like. In this state, when an operation button or an operation foot switch (not shown) is pressed, the sewing machine 1, the feed conveyor (scraping conveyor) 22, the transport conveyor 4, and the lower clamp 11 are activated, respectively, and the end of the fabric and the core The lower clamp 11 that holds the end of the tape is driven by the lower drive means 17 and moves in the sewing feed direction in accordance with the sewing feed speed. The conveyor 4 also conveys the fabric W at the same speed as the lower clamp 11.

  (5) When the lower clamp 11 comes to the front of the sewing machine 1 (before the sewing position), the sewing machine 1, the feed conveyor (scraping conveyor) 22, the transport conveyor 4 and the lower clamp 11 are automatically set on the advance limit sensor. Stop.

  (6) Then, the upper clamp 10 opens the tape guide and escapes from the work table 3.

  (7) Then, the upper clamp 10 moves in the anti-sewing direction in the retracted state.

  (8) Then, a driving button or a driving foot switch (not shown) is pressed. Then, the chuck 12 under the clamp 11 stopped in front of the sewing machine 1 automatically releases the grip and releases the fabric W and the core tape T.

  (9) The upper clamp 10 returns to the set position S, the lower clamp 11 remains stopped at the forward limit position, and the sewing machine 1, the feed conveyor (rake conveyor) 22, and the transfer conveyor 4 are activated. 1, the tape T is sewn to the end of the fabric W.

  When the sewing is completed to the end of the cloth, the sewing machine, the feed conveyor (rake conveyor) 22 and the conveyor 4 are automatically stopped in response to a signal from a cloth detection sensor (not shown) arranged in front of the sewing needle. A thread trimming knife (not shown) attached to the sewing machine 1 performs thread trimming. Then, the presser bar 6 rises and the lower clamp 11 returns to the retracted state at the set position. This completes one sewing (centering) operation.

  Then, when performing the sewing (core alignment) operation continuously, the upper clamp 10 and the lower clamp 11 return to the state of (1) in FIG. 5 while the end of the cloth is being sewn in the previous sewing. The next dough can be set and work efficiently and continuously.

  In the above description, the rail has been described with a configuration in which the rails are arranged in two upper and lower stages. However, the rail arrangement is not limited to two upper and lower stages, and the rails may be arranged in a horizontal direction or arranged in steps. Various configurations can be employed for the arrangement of the clamps and the arrangement of the rails so that each clamp moves in a circular motion.

  Moreover, this example is a case where it is used as a centering machine, but the sewing machine of the present invention is not limited to a core tape, but also a shade curtain shade tape (ring tape, tack tape), magic tape (registered trademark), It can be used to sew various tapes such as gather tapes, and can also be used to sew tape-like long objects in various applications. The sewing machine of the present invention can also be used for curtain splicing, hem stitching, bowing, and ear stitching. Do not use the tape guide or install it when using for splicing, hem stitching, bowing, and ear stitching.

The top view of the sewing machine of an example of this embodiment of the invention, It is a front view of the sewing machine shown in FIG. It is a left view of the sewing machine shown in FIG. It is a figure which shows the detailed structure of the chuck | zipper part on the clamp of the sewing machine shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is a left view. It is explanatory drawing of a series of operation | movement patterns of cloth feeding of the sewing machine shown in FIG. It is explanatory drawing of the operation | movement pattern of the fabric end feeding of the sewing machine shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Sewing machine stand 3 Work table 4 Conveyor 5 Space 6 Presser bar 7 Presser lifting cylinder 8 Rail upper 9 Rail lower 10 Clamp upper 11 Clamp lower 12 Material gripping means 13 Lifting and right and left slide mechanism 16 Driving means upper 17 Driving means lower 22 Feeding conveyor (rake conveyor)
23 Leading roller 25 Laser marker 26 End detection sensor 27 Tape guide 28 Drive means 29 Tape stand 30 Intermediate tape guide

Claims (1)

Two clamps that can be moved back and forth by driving means are arranged on the side of the work table in front of the sewing machine.
Each clamp has a gripping means for gripping the workpiece and a moving mechanism for moving the gripping means, and the gripping means is moved to a work position on the work table by the movement mechanism to grip the work to be sewn. It can be converted into a holding state to be held on, and a saving state in which the holding state is released and saved at a saving position,
One clamp has a turn that can be converted into a standing position that stands substantially vertically in a direction away from the work table and a recumbent position that is substantially horizontal and substantially perpendicular to the feed direction of the sewing machine and tilts in a direction protruding onto the work table. A tape guide of the type is provided,
The clamp provided with the tape guide is moved to the work position at the set position of the frontmost part of the work table, the fabric to be sewn is supplied to the set position, and the tape guide is moved to the recumbent position. The tape is supplied under the guide, and the leading end of the tape is superimposed on the initial end of the fabric at the set position, and the overlapped initial fabric end and the leading end of the tape are gripped by the gripping means of the clamp on the work table. After that, the clamp is moved to the sewing position, the fabric end side is gripped by the gripping means of the other clamp at the set position, and the clamp that has moved to the sewing position releases the grip of the fabric and tape. However, with the machine stopped at that position, start the sewing machine and move the clamp that grips the material end side in the machine feed direction according to the machine feed speed. The clamp is released at a predetermined position before the sewing position and returned to the set position, and the clamp is held at the predetermined position by holding the material end side again and moving it in the machine feed direction. A sewing machine characterized in that the operation of returning to the position is repeated until the end of the fabric.

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