JPS62142582A - Sewn article feeding apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sewing product feeding device used in a sewing machine.

[Conventional technology]

Generally, a sewing machine is provided with a cloth feeding device that feeds cloth in synchronization with the vertical movement of a needle. Industrial sewing machines have various problems that are different from general household sewing machines, so as disclosed in Japanese Patent Publication No. 57-30518, opposing rollers are provided, and one of the rollers is driven by a motor. A driven cloth feeding device has been proposed.

[Problem that the invention seeks to solve]

However, in conventional devices such as and, one roller is driven by a motor, but the other roller is rotated by friction with the fabric, and the roller has inertia, so the feeding of the fabric is difficult. The rotational speeds of the upper and lower rollers do not match when starting and stopping feed, and for this reason, when sewing thin fabrics on industrial sewing machines that feed at high speeds, it is difficult to start feed. This has the disadvantage that the stitches at the time and stop are different from other parts, resulting in uneven stitches.

The present invention has been made to solve these problems, and an object of the present invention is to provide a sewing product feeding device that can uniformly feed a sewing product.

[Means for solving problems]

In order to solve these drawbacks, the present invention provides independent motors for the upper and lower rollers, and allows the number of rotations of these motors to be controlled arbitrarily.

[For production]

The upper and lower rollers are driven simultaneously and independently.

〔Example〕

FIG. 1 is a perspective view showing a schematic configuration of a sewing machine to which the present invention is applied. In the figure, an upper shaft (main shaft) 2 that is rotationally driven by a driving force 1 is provided with a timing belt pulley 3 that rotates integrally with the upper shaft 2, and a timing belt 4 is driven via the timing belt pulley 3. and lower axis 5
The rotation of the upper shaft 2 is transmitted to. By this, gear 1
5.16 rotates, and the rotation is transmitted to the hook 17.

On the other hand, the rotation of the upper shaft 2 is controlled by the crank 6, the balance 7. Connecting rod 8.
9 or the like to the needle bar 10, causing the needle bar 10 to move up and down. Near the needle bar 10 there are rollers 13, 1 for feeding the fabric.
9 are provided facing each other, the lower roller 19 rotates together with the shaft of a pulse motor 18 provided near the roller 19, and the upper roller 13 is configured to be able to move up and down. , are biased downward by a spring (not shown) via the connecting rod 14e. Further, the upper roller 13 is rotationally driven by a pulse motor 11 provided near the upper shaft 2 via a timing belt 12. A needle position sensor 20 generates a signal representing the needle position based on the rotation of the upper shaft 2.

FIG. 2 is a block diagram showing an example of a device that drives the pulse motor 11, 18ft to rotate the rollers 13, 19'i. In this device, when a pedal is stepped on and a pedal switch 30 interlocked with the pedal switch is turned on, a signal for performing a reference operation of the sewing machine is transmitted from a sewing machine control circuit 31 to a signal generating circuit 32ge 32b s needle drive circuit 33.

As a result, the signal generating circuits 32, 32b generate pulse signals for driving the pulse motors 11, 18'fr, and rotate the cloth feeding rollers 13, 19e at the same speed in opposite directions. Then, the needle drive circuit 33 transmits the rotation of the upper shaft 2 to the crank 6 by bringing a clutch (not shown) into contact, thereby enabling the needle bar 10 to move up and down.

Therefore, when the idle feed switch 34 is turned off, the clutch becomes in a non-contact state, and the needle bar 10 does not move and the roller 1
A state is reached in which only rotations 3 and 19 are performed, that is, a state in which only the cloth is fed and no sewing is performed. The feed of the rollers 13 and 19 during sewing is controlled by the needle position sensor 20.
This is done in synchronization with the up and down movement of the hands by signals from the.

Rotation direction switching circuit 35. , 35b is a backward sewing switch 36t--when turned on, the direction of the current supplied to the pulse motors 11, 18 is reversed, thereby the direction of rotation of the pulse motors 11, 1B is reversed, and backward sewing is performed. .

Signal generation circuit 32. ．． The number of pulses generated from 32b is determined by a signal supplied from sewing machine control circuit 31 and a signal supplied from speed control circuit 38, and is synchronized with the vertical movement of the needle. The number of pulses is the same, and the number of pulses is determined by the signal supplied from the sewing machine control circuit 31, but when the differential stitching switch 31 is on, the number of pulses generated from the signal generation circuits 32a and 32b is the same. can be set independently. Therefore, by setting the rotation speeds of the pulse motors 11 and 18 to different values, example 9.8. When sewing a material that is hard and does not deform, such as a heel, and is sewn on a curved surface, the number of revolutions of the upper and lower four wheels can be changed to feed the sewing product in the optimal condition.

〔Effect of the invention〕

As explained above, in this invention, the opposing rollers are driven independently by motors, so the upper roller and the lower roller can be driven simultaneously and independently, which allows for smooth feeding of the sewing material. It has the effect of being able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a schematic configuration of a sewing machine to which the present invention is applied, and FIG. 2 is a block diagram showing an example of a device for driving rollers. 10...Fist/needle L11, 18...War/pulse motor, 12...Timing belt, 13,111Φ...
・Roller, 30...Pedal switch, 34...
Jump feed switch, 3G...Reverse sewing switch, 3T
...Differential sewing switch. Agent Masuo Oiwa 11.18
: Pulsmoke 12: Queen 7゛Bele Y 13.19 i Roller Diagram 2 Procedural Correction (Written spontaneously) May 5, 1986

Claims (1)

[Claims] A roller for feeding the sewing product is provided facing each other in a position close to the needle, a motor is provided for driving the roller for each roller, and the motor is operated at a predetermined speed corresponding to the number of rotations of the sewing machine. a signal generation circuit that generates a driving signal;
A sewing product feeding device comprising a speed control circuit that controls the motor speed difference to an arbitrary value.