JPH04132584A - Sewing guide device for sewing machine - Google Patents

Abstract

PURPOSE:To enable the positional deviation of a sewn object to be corrected to a predetermined position before sewing and a position of sewing allowance of the sewn object to be adjusted without the manual operation of an operator by horizontally moving a sewn object position correction means and contact releasing means nearly perpendicularly to the cloth feeding direction of the sewn object. CONSTITUTION:When a sewn object 2 is formed with stitches 3, an end of the sewn object 2 is detected by a sensor 5 and a control device, upon receiving the detecting signal, directs a reversible motor 12 to rotate. The reversible motor 12 is properly rotated by the rotational direction to rotate a rotary wheel 8 through a timing belt 11. Namely, the rotary wheel 8 is rotated forward and backward and stopped as the reversible motor 12 is rotated forward and backward and stopped. The sewn object 2 held between a cloth driving wheel 8a and a cloth guide plate 7 is moved by the rotation of the rotary wheel 8. Thus, by properly moving the sewn object 2 perpendicularly to the cloth feeding direction, the positional deviation of the sewn object 2 is corrected to a regular right position before sewing to ensure a predetermined sewing allowance 4.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sewing guide device for a sewing machine, and in particular,
The present invention relates to a sewing guide device for a sewing machine that moves a workpiece and corrects misalignment of the workpiece to a normal position before sewing.

[Prior Art] Conventionally, when sewing with a sewing machine, a sewing guide device for the sewing machine has been used to correct misalignment of the workpiece to the normal position in order to correctly sew the workpiece in the correct position. There is.

As a conventional sewing guide device for this type of sewing machine, the
The technique disclosed in Japanese Patent No. 7-16834 can be mentioned.

This publication states that while the pinion is constantly pressed against the fabric to be sewn, the pinion is rotated in the forward or reverse direction to move the fabric appropriately in a direction perpendicular to the feeding direction of the fabric, thereby positioning the fabric. A technique for correcting this is disclosed. That is, in this sewing machine sewing guide device, an arm having a position regulating pinion at its tip is tilted toward the surface of the workpiece and is swingably supported with respect to the base, and the pinion at the end is attached to the workpiece. The pinion is directly driven by a motor fixed to the end of the arm via a transmission mechanism. The operation of pressing the pinion against the workpiece is as follows:
This is done using an air cylinder that swings the arm, and this air cylinder is also used when setting the object to be sewn.

In addition to the above-mentioned publication, there has been a sewing guide device for sewing machines that can be attached to the sewing machine body and adjust the position Wl, and as a conventional sewing guide device for this type of sewing machine, Utility Model Publication No. 62-4307 The technology published in the publication No. 1 can be cited.

This publication states that one of the mounting members for attaching the sewing guide device for the sewing machine to the sewing machine main body is fixed to the sewing machine main body, and the other of the mounting members is used to hold the cover member of the sewing guide device for the sewing machine so as to be able to move up and down and rotate freely. Accordingly, a technique has been disclosed that deals with the attachment and positioning of a sewing guide device for a sewing machine to a sewing machine main body. Further, in this sewing guide device for a sewing machine, a detection member for detecting the position of the workpiece for adjusting the seam allowance of the workpiece is held by a holding plate slidably inserted into the cover member. . Further, an adjustment mechanism is provided for moving this detection member in a direction intersecting the cloth feeding direction.

[Problems to be Solved by the Invention] In the conventional sewing guide device for a sewing machine as described above, an operator manually attaches it to the sewing machine body and adjusts its position, and it is difficult to replace needles and threads and perform maintenance. Ta. Also,
A worker manually operates an adjustment mechanism to move a detection member that detects the position of the workpiece in a direction intersecting the fabric feeding direction to adjust the seam allowance of the workpiece.

Therefore, it is necessary to move the entire device manually each time the needle or thread is replaced, the sewing guide device for the sewing machine is maintained, or the seam allowance of the sewing material is adjusted.
These tasks were time-consuming and troublesome. In particular, it is unsuitable for use in a sewing machine that sequentially sews objects with different seam allowances one after another. For this reason, it has been desired to automate the movement of sewing guide devices for sewing machines.

Therefore, when sewing with a sewing machine, the present invention is capable of correcting misalignment of the workpiece to a predetermined position before sewing, and adjusting the seam allowance position of the workpiece without manual operation by the operator. It is an object of the present invention to provide a sewing guide device for a sewing machine that can be easily operated.

[Means for Solving the Problems] The sewing guide device for a sewing machine according to the present invention detects a positional shift of the workpiece by the workpiece position correcting means, and in response to this detection, adjusts the position of the workpiece before sewing. At the same time, the contact release means releases the contact state between the workpiece position correction means and the workpiece as necessary, and the movement means releases the workpiece position correction means and the contact release means from the motor. The driving force is used to horizontally move the workpiece in a direction substantially perpendicular to the cloth feeding direction.

[Function] In the present invention, the positional deviation of the object to be sewn is detected, and in response to this detection, the object to be sewn is moved to the normal position before sewing, and the contact state with the object to be sewn is adjusted as necessary. The mechanism for guiding the workpiece is moved horizontally in a direction approximately perpendicular to the cloth feeding direction of the workpiece. In addition to being able to correct the position correctly, the sewing machine sewing guide device can be moved manually by the operator when replacing the needle or thread, performing maintenance work on the sewing machine sewing guide device, or adjusting the seam allowance of the workpiece. It can be done independently.

[Example] Examples of the present invention will be described below.

FIG. 1 is a perspective view showing a sewing guide device for a sewing machine which is an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which the sewing guide device for a sewing machine which is an embodiment of the invention contacts a workpiece. Fig. 3 is a mechanical diagram of a main part of a sewing guide device for a sewing machine, which is an embodiment of the present invention, showing a state in which it is separated from a workpiece to be sewn.

In the figure, a predetermined stitch 3 is formed on the workpiece 2 by repeatedly reciprocating the sewing machine 311 in the −1− downward direction. Normally, the seam 3 is formed keeping a predetermined seam allowance 4 from the end of the workpiece 2. In this sewing guide device for a sewing machine, the end portion of the object 2 to be sewn is constantly sensed by the sensor 5 to detect a positional shift of the object 2 to be sewn. Also,
This sewing guide device for a sewing machine is covered by a cover member 6, and the sensor 5 is disposed on the cover member 6, and a cloth guide plate 7 for guiding the workpiece 2 is disposed at the lower part. It is set up. Then, the cloth guide plate 7 and the rotating wheel 8
Sewing is performed by a sewing machine with the workpiece 2 interposed between the two. The rotating wheel 8 is composed of a cloth driving wheel 8a with anti-slip knurls carved around the periphery, and a pulley 8b that rotates integrally with the cloth driving wheel 8a. It is rotatably supported by the bin 10. The rotating wheel 8 is rotated by a timing belt 11, and this timing belt 11 is connected to a forward/reverse motor 12.
is driven via the pulley 13.

Therefore, the rotating wheel 8 rotates according to the rotational operation of the forward/reverse rotation motor 12. The forward and reverse rotation motor 12 is fixed to the swinging body 9, and the forward and reverse rotation motor 12 is urged downward by a spring 14.

The urging force of the spring 14 is adjusted by a pressure adjuster 15 screwed onto the cover member 6. Further, a motor 16 is disposed on the cover member 6, and a circular cam body 18 is attached to a rotating shaft 17 of the motor 16. The cam body 18 rotates eccentrically about the rotating shaft 17 due to the rotation of the motor 16, so that the rocking body 9 performs a predetermined rocking motion. In response to this rocking motion of the rocking body 9,
Contact and separation between the rotating wheel 8 and the workpiece 2 are alternately repeated. That is, when the contact portion 18a of the cam body 18 is located on the rocking body 9 side, the rotating ring 8 and the workpiece 2 are in contact with each other (see FIG. 2), and the separation portion 18b is located on the rocking body 9 side. When positioned, the rotary wheel 8 and the workpiece 2 are separated from each other (see FIG. 3).

The other end 9b of the rocking body 9 on the opposite rotation wheel 8 side can be pressed by an air cylinder 19 attached to the cover member 6. This air cylinder 19 operates when setting the workpiece 2, etc., and presses the end 9b of the oscillating body 9 downward, thereby moving the rotary ring 8 located at the other end 9a of the oscillating body 9. Push upward. The rocking body 9 is rotatable around a support shaft 2o, and the support shaft 20 fits into the hole 6a of the cover member 6 to support the rocking body 9.

Further, the cover member 6 is attached to the moving member 3 via the mounting member 30.
It is fixed at 1. The moving member 31 can slide along a guide shaft 32, and the guide shaft 32 is attached to a base 33, which is a base.

A pole screw 34 is attached to the base 33 in parallel with the guide shaft 32, and the moving member 31 moves in response to rotation of the pole screw 34. The amount and direction of movement are regulated by the guide shaft 32 and the pole screw 34. Note that this base 33 is fixed to the sewing machine body.

A pulley 35 is attached to the end of the pole screw 34, and is connected to a forward/reverse motor 37 via a timing belt 36.
driving force is transmitted. That is, the timing belt 36 is driven by the rotation of the pulley 38 attached to the rotating shaft of the forward/reverse motor 37, and the pulley 35 and the pole screw 34 are driven.
rotate as one. The rotational speed of the pulley 35 and the pole screw 34 is detected by the encoder 39, and the position of the cover member 6 can be determined from the detection results.

As a result, the position of the cover member 6 may be automatically controlled based on information from the encoder 39.

The sewing guide device for the sewing machine of this embodiment is constructed as described above, and when forming the stitch 3 on the workpiece 2, the sensor 5 detects the end of the workpiece 2, and the detection signal is In response, the control bag M (not shown) gives a rotation instruction to the forward/reverse rotation motor 12. In response to this rotation instruction, the forward/reverse motor 12 rotates as appropriate, and the rotating wheel 8 rotates via the timing belt 11 . That is, the rotating wheel 8 rotates normally, reversely, and stops in response to the normal rotation, reverse rotation, and stop of the forward and reverse rotation motor 12. This rotating wheel 8
Due to this rotation, the workpiece 2 held between the cloth driving wheel 8a and the cloth guide plate 7 moves. Note that the direction of movement of the object 2 to be sewn is perpendicular to the cloth feeding direction of the object 2 to be sewn. In this way, by appropriately moving the workpiece 2 in the direction perpendicular to the cloth feeding direction, the workpiece 2 can be moved before sewing.
The 0 position deviation is corrected to the regular correct position, and a predetermined seam allowance 4 is secured.

Furthermore, when forming the stitches 3 on the object to be sewn 2, a well-known cloth feeding operation is performed by a cloth feeding device (not shown) in synchronization with the reciprocating movement of the needle 1. This cloth feeding device performs a feeding operation in synchronization with the rotation pulse signal of the sewing machine, and at this time, a motor drive control device (not shown) drives the motor 16 in response to the rotation pulse signal of the sewing machine. and,
As the motor 16 rotates, the cam body 18 attached to the rotating shaft 17 of the motor 16 also rotates, and the cam body 1
The oscillating body 9 oscillates due to the rotation of 8, that is, the cam body 18
rotates eccentrically around the rotating shaft 17, and when the contact portion 18a of the cam body 18 is located on the rocking body 9 side, the cam body 1
8 and the rocking body 9 are in a non-contact state, and the end portion 9a of the rocking body 9 swings downward about the support shaft 20 by the urging force of the spring 14. On the other hand, when the detached portion 18b of the cam body 18 is located on the rocking body 9 side, the cam body 18 and the rocking body 9 are in contact, and the rocking body 9 is connected to the spring 14.
The end portion 9a swings upward using the support shaft 20 as a fulcrum against the urging force of. As a result, the contact portion 18a of the cam body 18
is located on the rocking body 9 side, the rotating wheel 8 and the workpiece 2
are in contact with each other, and the rotating ring 8 is pressed against the workpiece 2 (see FIG. 2). On the other hand, when the detached portion 18b of the cam body 18 is located on the rocking body 9 side, the rotating ring 8 and the workpiece 2 are in contact with each other. The contact state with the object to be sewn 2 is released, and the rotary wheel 8 and the object to be sewn 2 are separated from each other (see FIG. 3). In this way, the rocking of the rocking body 9 is synchronized with the rotation of the sewing machine and also with the cloth feeding operation by the cloth feeding device. Therefore, while the workpiece 2 is moving in the cloth feeding direction, the rotating wheel 8 and the workpiece 2
The sewing machine is in a separated state, and the movement of the sewing object 2 in the cloth feeding direction is not hindered by the rotating wheel 8. Further, while the workpiece 2 is moving in the cloth feeding direction or is in a stopped state, the rotating wheel 8 and the workpiece 2 are in contact with each other. The position in the direction perpendicular to the cloth feeding direction is adjusted.

Furthermore, the cover member 6 is attached to the moving member 3 via the mounting member 30.
1, as the movable member 31 and the cover member 6 move, the sensor 5 attached to the cover member 6 also moves together. Therefore, the sensing position of the end of the workpiece 2 by the sensor 5 changes,
As a result, the relative distance between the needle 1 and the sensor 5 changes, and the width of the seam allowance 4 also changes in accordance with this change. In this way, by appropriately changing the position of the sensor 5 by moving the cover member 6, the width dimension of the seam allowance 4 can be adjusted extremely easily. Note that it is not possible to move the cover member 6 while the workpiece 2 is being held between the cloth guide plate 7 and the rotary wheel 8. Therefore, when moving the cover member 6, please use an air cylinder in advance. 19 to operate the rocking body 9.
It is necessary to press the end portion 9b downward to release the contact state between the rotary wheel 8 and the workpiece 2. Furthermore, as the cover member 6 moves, other mechanisms attached to the cover member 6 also move together, so a work area near the needle 1 is secured, and the needle 1 and thread can be replaced. In addition to making the work easier, maintenance work for the sewing guide device for the sewing machine can also be made easier.

Moreover, in this embodiment, the cover member 6 can be moved by driving the forward/reverse motor 37 without manual operation by the operator.

As mentioned above, the sewing guide device for the sewing machine of this embodiment is
The sensor 5 detects the positional deviation of the workpiece 2 at the end of the workpiece 2, and in response to the detection by the sensor 5, the oscillator 9 is moved through the timing belt 11 by driving the forward/reverse motor 12 before sewing. By rotating the rotary wheel 8 of the end portion 9a of the sewing material to move the sewing material 2 to the normal position, and by pressing the end portion 9b of the swinging body 9 with the air cylinder 19, the sewing material is adjusted. A contact release means for releasing the contact state between the sewing object position correcting means and the sewing object 2 as necessary for adjusting the seam allowance 4, etc.; A moving means is provided which horizontally moves the object to be sewn 2 in a direction substantially perpendicular to the cloth feeding direction by rotating the pole screw 34 with a driving force and moving the moving member 31 and the cover member 6.

Then, the positional deviation of the workpiece 2 is detected, and in response to this detection, the workpiece 2 is moved to the normal position before sewing, and the contact with the workpiece 2 is released as necessary. ,
Each mechanism for guiding the sewing material is moved horizontally in a direction substantially perpendicular to the cloth feeding direction of the sewing material using the driving force of the motor.

Therefore, when sewing with a sewing machine, the positional deviation of the workpiece 2 can be corrected to the normal position before sewing, as in the conventional sewing machine. Therefore, sewing can be performed correctly at the regular position of the workpiece 2. Further, unlike in the past, there is no need to manually move the entire device each time the needle 1 or thread is replaced, the sewing guide device for the sewing machine is maintained, or the seam allowance 4 of the workpiece 2 is adjusted. Therefore, the work of replacing the needle 1 and the thread, the maintenance work of the sewing guide device for the sewing machine, or the work of adjusting the width 4 of the object 2 to be sewn is facilitated, and the work efficiency is greatly improved. In particular, if the present invention is used in a sewing machine that successively sews objects having different seam allowances one after another, automation of the sewing work by the sewing machine can be significantly promoted.

Next, another embodiment of this sewing guide device for a sewing machine will be described.

In the above embodiment, the sensor 5 detects the positional deviation of the workpiece 2 at the edge of the workpiece 2 in the workpiece position correction means, but the detection method and the number of sensors 5 can be arbitrarily determined. It is also possible to change it. For example, although a non-contact light-sensitive sensor 5 is normally employed as the sensor 5, it may also be a contact sensor that detects the edge of the object 2 to be sewn. Furthermore, the number of sensors 5 is not limited to one, and a plurality of sensors 5 may be provided to increase detection accuracy and improve reliability of the entire device. The sensor 5 also detects the positional deviation of the workpiece 2 in the above embodiment.
Although the detection is performed using the end portion of the sewing object 2 as a reference, the overlapping position of the objects to be sewn 2 may be used as a reference, and the reference position may be any position. However, a position that is as easy to detect as possible should be selected.

Further, the operation of moving the workpiece 2 to the normal position in the workpiece position correcting means is performed by driving the forward/reverse rotation motor 12 via the timing belt 11 at the end 9a of the swinging body 9.
This was realized by rotating the rotary wheel 8 of the machine to move the workpiece 2 to the normal position. It may be configured as follows.

Further, in the above embodiment, the contact release means is described as one in which the end portion 9b of the rocking body 9 is pressed by the air syringe 19, but a cam or a link mechanism, or a hydraulic actuator or the like may also be used. . Further, in order to release the contact state between the sewing object position correcting means and the sewing object 2 as necessary, the operation order is regulated so that the contact release means operates in advance before the forward/reverse rotation motor 37 is driven. For example, if this sewing machine sewing guide device is automated, it is possible to prevent the occurrence of secondary defects such as damage to the workpiece 2, ensure proper continuous operation, and improve the reliability of the entire device. .

In addition, in the above-mentioned embodiment, the moving member 31 and the cover member 6 are moved by rotating the pole screw 34 with the driving force of the forward/reverse motor 37 as a moving means, but the manual operation by the operator It does not matter if it is done automatically using a motor. For example, the moving member 31 and the cover member 6 may be moved by a timing belt drive or a chain drive, or may be moved using a rack and pinion mechanism.

Incidentally, in the above embodiment, the case where the sewing guide device for a sewing machine is mainly used for sewing cloth has been described, but it can of course also be used for a high frequency sewing machine for sewing sheets made of synthetic resin or the like.

[Effects of the Invention] As described above, the sewing guide device for a sewing machine according to the present invention includes a sewing object position correcting means for moving the sewing object to a normal position, and a contacting means for releasing the contact state with the sewing object 2. a release means;
a moving means for moving the sewing object position correcting means and the contact release means using the driving force of a motor, detecting a positional shift of the sewing object, and in response to this detection, adjusting the sewing object position before sewing. At the same time, the contact with the workpiece is released as necessary, and each mechanism for guiding the workpiece is moved approximately in the direction of cloth feeding of the workpiece using the driving force of the motor. The simple structure of horizontal movement in the right angle direction allows correct correction of misalignment of the workpiece when sewing with a sewing machine, allowing the workpiece to be sewn in the correct position, as well as replacing needles and threads, and making it easier for the sewing machine to sew. When performing maintenance work on the sewing machine sewing guide device or adjusting the seam allowance of a workpiece, the sewing machine sewing guide device can be moved without manual operation by the operator, making each of these tasks easier. This improves work efficiency and facilitates the automation of sewing using sewing machines.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a sewing guide device for a sewing machine which is an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which the sewing guide device for a sewing machine which is an embodiment of the invention contacts a workpiece. Fig. 3 is a mechanical diagram of a main part of a sewing guide device for a sewing machine, which is an embodiment of the present invention, showing a state in which it is separated from a workpiece to be sewn. In the figure, needle 2 3: Stitch 4 5: Sensor 7 8: Rotating wheel 8a 9: Oscillating body 11 12: Forward/reverse motor 14 15: Suppression adjuster 16 18: Cam body 20 31: Moving member 32 34: Ball Screw 36: Timing belt 37: Forward/reverse motor Sewn material seam allowance cloth guide plate Cloth portion Driving wheel Timing belt Spring Motor support shaft Guy F axis. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Agent: Patent attorney Takehisa Higuchi and 1 other person

Claims (1)

[Claims] Detecting the positional deviation of the object to be sewn, and according to the detection output,
A workpiece position correcting means for moving the workpiece to a predetermined position before sewing; a contact release means for releasing the contact state between the workpiece position correcting means and the workpiece as necessary; A sewing guide device for a sewing machine, comprising a moving means for horizontally moving the sewing object position correcting means and the contact release means in a direction substantially perpendicular to the cloth feeding direction of the sewing object.