JPH04132585A - Sewing guide device for sewing machine - Google Patents

Abstract

PURPOSE:To enable the positional deviation of a sewn object to be corrected to a regular position before sewing without providing resistance to the direction of cloth feeding operation by providing a contacting and disconnecting means for swinging a sewn object moving means to perform the contact with and disconnection from the sewn object according to the timing of the cloth feeding operation in the sewing. CONSTITUTION:When a contact part 18a of a cam body 18 is located on the swinging body 9 side, a rotary wheel 8 makes contact with a sewn object 2 to be pressed thereto. On the other hand, when a disconnection part 18b of the cam body 18 is located on the swinging body 9 side, the rotary wheel 8 is disconnected from the sewn object 2 releasably. While the swing of the swinging body 9 is synchronized with the rotation of a sewing machine, it is also synchronized with the cloth feeding operation of a cloth feeding device. Thus, while the sewn object 2 is moving in the cloth feeding direction, the rotary wheel 8 is disconnected from the sewn object 2 so that the movement of the sewn object 2 in the cloth feeding direction is not interfered with the rotary wheel 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sewing guide device for a sewing machine, and in particular,
Sewing guide for sewing machines that moves the workpiece and corrects misalignment of the workpiece to the correct position before sewing [Prior art] Traditionally, when sewing with a sewing machine, it has been used to correctly position the workpiece in the correct position. In order to do this, a sewing guide device for a sewing machine is used which corrects the misalignment of the sewing object to the normal position.

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 tip of the arm via a transmission mechanism. Note that the action of pressing the pinion against the workpiece is performed by an air cylinder that swings the arm. Further, this air cylinder is also used when setting a workpiece to be sewn.

[Problems to be Solved by the Invention] In the conventional sewing guide device for a sewing machine as described above, the cloth, which is the object to be sewn, is constantly pressed by the pinion during sewing. Furthermore, in conventional sewing machines, when forming stitches on a material to be sewn, a cloth feeding device normally performs a cloth feeding operation in accordance with the reciprocating movement of the needle, for example, intermittent feeding according to the stitch pitch. was.

Therefore, in the conventional sewing guide device for a sewing machine, the pinion of the sewing guide device for a sewing machine pulls the fabric during this cloth feeding operation, creating resistance during cloth feeding. For this reason, the pitch of the stitches becomes unstable and wrinkles occur in the fabric, which adversely affects the sewing finish, and there has been a desire to improve this problem.

SUMMARY OF THE INVENTION Therefore, the present invention provides a sewing guide device for a sewing machine that is capable of correcting misalignment of a workpiece to the normal position before sewing, and that does not cause resistance to the movement direction of cloth feeding. The challenge is to

[Means for Solving the Problems] A sewing guide device for a sewing machine according to the present invention detects a positional shift of an object to be sewn using a position detecting means, and in response to this detection, moves the object to be sewn using an object moving means. The object to be sewn is brought into contact with the object to be sewn to a proper position before sewing, and the object moving means is swung by the contact/separation means to avoid contact and separation between the object moving means and the object to be sewn. This is done according to the cloth feeding operation at the time.

[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 brought into contact with the object to be sewn and moved to the proper position before sewing, and the object to be sewn is moved to the correct position before sewing. Since contact and separation are made in accordance with the cloth feeding operation during sewing, when sewing with a sewing machine, it is possible to correctly correct misalignment of the workpiece to the correct position before sewing, and also to correct the misalignment of the workpiece to the correct position when sewing with a sewing machine. , the material to be sewn is not pulled, and there is no resistance when feeding the cloth.

[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 a workpiece 2 by repeatedly reciprocating a sewing machine needle 1 in the vertical direction. Normally, the seam 3 is a predetermined seam allowance 4 from the end of the workpiece 2.
It is formed by keeping the With this sewing machine sewing guide device,
The end of the object 2 to be sewn is constantly sensed by a sensor 5 to detect positional scratches on the object 2 to be sewn. Further, this sewing guide device for the 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 material to be sewn 2 is provided at the lower part. is installed. Then, sewing is performed by the sewing machine with the workpiece 2 interposed between the cloth guide plate 7 and the rotary wheel 8. The rotating wheel 8 is composed of a cloth driven wheel 8a with anti-slip knurls carved around its periphery, and a pulley 8b that rotates integrally with the cloth driven wheel 8a. It is rotatably supported by a pin 10. The rotating wheel 8 is rotated by a belt 11, and this belt 11 is driven via a pulley 13 by a forward/reverse motor 12. 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. Spring 1
The biasing force 4 is generated by a suppression adjuster 15 screwed onto the cover member 6.
Adjusted by Also, the cover member 6 includes a motor 16.
A circular cam body 18 is mounted on the rotating shaft 17 of the motor 16.

Then, this cam body 18 is rotated by the rotation of the motor 16 to rotate the rotation shaft 1.
By rotating eccentrically about 7, the rocking body 9 performs a predetermined rocking motion. In response to the swinging motion of the swinging body 9, contact and separation between the rotary 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 side opposite to the rotation shaft 8 is in a state where it can be pressed by an air cylinder 19 attached to the cover member 6. This air cylinder 19 is activated when the workpiece 2 is set, and by pressing the end 9b of the swinging body 9 downward, the rotating ring 8 located at the other end 9a of the swinging body 9 is moved upward. Push up.

The rocking body 9 is rotatable around a support shaft 20, and the support shaft 20 fits into the hole 6a of the cover member 6 to support the rocking body 9.

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, a control device (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 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. Due to this rotation of the rotary wheel 8, the workpiece 2 held between the cloth section 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 manner, by appropriately moving the workpiece 2 in a direction perpendicular to the cloth feeding direction, the misalignment of the workpiece 2 is corrected to the correct position before sewing, 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 rotation of 8 causes the oscillating body 9 to oscillate. 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
When is located on the rocking body 9 side, the rotary wheel 8 and the workpiece 2 are in contact with each other, and the rotary ring 8 is pressed against the workpiece 2 (see FIG. 2). On the other hand, the detachment portion 18 of the cam body 18
When b is located on the rocking body 9 side, the contact state between the rotary wheel 8 and the workpiece 2 is released, and the rotary wheel 8 and the workpiece 2 are separated (see FIG. 3). In this way, the rocking body 9
The swinging 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 are separated from each other, and the rotating wheel 8 prevents the workpiece 2 from moving in the cloth feeding direction. You won't be disappointed. Further, while the movement of the workpiece 2 in the cloth feeding direction is in a stopped state, the rotating wheel 8 and the workpiece 2 are in contact with each other, and at this time, the rotation of the cloth section driving wheel 8a causes the workpiece to be sewn. The position of No. 2 in the direction perpendicular to the cloth feeding direction is adjusted.

As mentioned above, the sewing guide device for the sewing machine of this embodiment is
A sensor 5 functioning as a position detection means for detecting a positional shift of the workpiece 2 at an end of the workpiece 2;
and the fabric driving wheel 8 of the rotating wheel 8 located at the end 9a of the rocking body 9.
a, and in response to the detection by the sensor 5, the rotating wheel 8 of the end 9a of the oscillator 9 is rotated via the belt 11 by the drive of the forward/reverse motor 12 before sewing, and the object 2 is sewn.
a sewing object moving means for moving the sewing material to a normal position; Contact and separation between the fabric part drive wheel 8a of the rotating wheel 8 and the workpiece 2 in accordance with the fabric feeding operation during sewing.
It is equipped with a means of escape.

Then, the positional shift of the workpiece 2 is detected, and in response to this detection, the workpiece 2 is brought into contact with the workpiece 2 and moved to the normal position before sewing, and the workpiece 2 is brought into contact with the workpiece 2. and detachment are performed in accordance with the cloth feeding operation during sewing.

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 correct position on the object 2 to be sewn. Moreover, unlike the conventional sewing machine, the sewing guide device for the sewing machine does not pull the fabric, which is the object to be sewn 2, during the cloth feeding operation, and does not create resistance during cloth feeding. Therefore, the material to be sewn 2 is properly fed by the cloth feeding operation, the pitch of the stitches 3 is stabilized, wrinkles can be prevented from occurring in the material to be sewn 2, and the sewing finish is improved.

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

In the above embodiment, the case where the sensor 5 is used as the position detecting means has been described. This sensor 5 is normally a non-contact light-sensitive sensor, but it may also be a contact sensor that detects the edge of the object 2 to be sewn. Also, this sensor 5
The number of sensors is not limited to one, and a plurality of sensors may be provided to improve detection accuracy and reliability of the entire device.

In the above embodiment, the sensor 5 detects the positional deviation of the object to be sewn 2 based on the edge of the object to be sewn 2, but it is now possible to detect the positional deviation of the object to be sewn 2 based on the overlapping position of the object to be sewn 2. It may be any position as long as it can serve as a reference position. However, a position that is as easy to detect as possible should be selected.

Further, in the above embodiment, the article to be sewn is moved by pressing the article to be sewn 2 with the cloth driving wheel 8a of the rotary wheel 8 as the means for moving the article to be sewn. Alternatively, the belt 11 may be used to move the sewing object 2 by pressing the belt 11 . Further, in the above embodiment, one piece of workpiece moving means is disposed on the upper surface side of the workpiece 2, but a plurality of workpiece moving means may be used, and their arrangement position is also different from the workpiece 2. It is not limited to the upper surface side, but may be the lower surface side.

Furthermore, in the above embodiment, a circular cam body 18 with an eccentric rotation center is rotated as the contact/separation means to swing the rocking body 9, but the shape of this cam body 18 is similar to that of the seam 3. In view of the relationship with the pitch, that is, the cloth feeding speed, the shape may be, for example, a substantially triangular so-called rice ball shape. Further, in the above embodiment, the cam body 18 is connected to the support shaft 20 of the rocking body 9.
The cam body 18 is disposed on the rocking body 9'' on the side opposite to the rotating wheel 8, but this cam body 18 is placed on the rocking body 9 between the support shaft 20 and the rotating wheel 8.
It may also be arranged so that the cam body 18 pushes up the rocking body 9 from below to swing the rocking body 9.

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 of the present invention includes a position detection means for detecting the positional deviation of the workpiece, and a workpiece moving means for moving the workpiece to the normal position. , is equipped with a contact/detachment means for contacting and separating from the workpiece, detects the positional deviation of the workpiece, and, in response to this detection, contacts the workpiece to correct the workpiece before sewing. By moving the workpiece to the position of The object can be sewn in the correct position, and the object to be sewn is not pulled during cloth feeding, so there is no resistance during cloth feeding, so the pitch of the stitches is stable, and the object is more easily sewn. This prevents wrinkles from forming and improves the sewing finish.

20: Support shaft It is.

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

[Brief explanation of the drawing]

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, when it is separated from a workpiece to be sewn. In the figure, 2: Sewing object 5 8: Rotating wheel 8a 9: Oscillating body 11 12: Forward and reverse rotation motor 15 16: Motor 18 Sensor cloth part driving wheel timing belt suppression adjuster cam body

Claims (1)

[Scope of Claims] Position detection means for detecting a positional shift of the workpiece, and a position detecting means that contacts the workpiece to position the workpiece in a predetermined position before sewing, according to a detection output of the position detection means. A sewing object moving means for moving the sewing object, and a contact/separation means for swinging the sewing object moving means to bring into contact with and detach from the sewing object in accordance with the timing of a cloth feeding operation during sewing. A sewing guide device for a sewing machine, which is characterized by: