JPH02268796A - Sewing device for putting cloth-hem together - Google Patents

Abstract

PURPOSE:To accurately sew both pieces of cloth together even for the cloth with a cutting error or with a different elongation percentage in properties of its surface, by a method wherein tension is applied to the cloth by a tension motor and a feeding roller is so controlled that the tension is kept constant between the motor and presser foot. CONSTITUTION:Both pieces of cloth 11, 12 held by a parallel-holding device (c) are led to the bottom of a presser foot 2 after respectively passed through between controlling rollers 3, 4 and feeding rollers 5, 6 for cloth hem-controlling device (b). A setting value of one tension in this state is set, and a tension motor (m) is driven according to the setting value. The tension between the parallel-holding device (c) and the cloth hem-controlling device (b) is specified by tension sensors 15, 16, and is inputted to a controller and stored. In the above state, when both pieces of the cloth 11, 12 are sewed together, they are separatedly passed through on the controlling rollers 3, 4. At this time, since the other tension is produced between the controlling rollers 3, 4 and the presser foot 2 because of the frictional resistance on the controlling rollers, this tension is specified by tension sensors 9, 10 and inputted to the controller once again. Either the upper cloth-feeding roller 5 or the lower cloth-feeding roller 6, or both of them are driven and controlled by the controller so that the difference between them may be equal to zero.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cloth end seaming device most suitable for use in an automatic sewing machine.

(Prior Art) Fabrics cut for sewing usually have variations in cutting errors and elongation rates of their surface properties. If fabrics with such unevenness are simply sewn together, so-called "sparkling" occurs, and in order to prevent this from occurring, conventional methods relied on manual work by skilled workers.

For example, when sewing fabrics with cutting errors, the fabric is sewn while pulling the middle part of the fabric a little in order to absorb the difference in length. Furthermore, when sewing different types of fabrics with different surface elongation rates, the amount of feed of the upper fabric has to be adjusted based on the characteristics of the fabrics.

(Problems to be solved by the present invention) As mentioned above, in the past, the manual work of skilled workers was relied upon.
There has been a problem in that the quality of the finished sewing varies somewhat depending on the level of skill. Especially since there is a shortage of skilled workers these days,
There is wide variation in the quality of the finished product.

An object of the present invention is to provide a device that can accurately sew fabrics with differences in cutting errors, elongation rates, etc. of surface properties.

(Means for Solving Problems) This invention provides a material edge control device provided near a presser foot of a sewing machine, a material edge control device provided at a position away from the material edge control device, and a material and a tension motor that applies tension to the fabric up to the edge control device, and the fabric edge control device includes a pair of control rollers that control the fabric edge, a pair of feed rollers that control the tension of the fabric edge, and the feed roller. and a pair of second tension sensors that detect the tension of the fabric from the presser foot to the presser metal fitting, and the fabric edge control device includes a pair of first tension sensors that detect the tension between the fabric edge control device and the fabric edge control device. Moreover, it is characterized in that a controller is provided to control the feed roller so that the tension of the cloth between the feed roller and the presser metal fitting becomes the tension set by the tension motor.

(Operation of the present invention) This invention applies tension to cloth using a tension motor, and
The feed roller operates so that the force exerted by the tension motor is maintained all the way to the presser foot of the sewing machine. Therefore, the fabric that reaches the presser metal fitting can be sewn together without any damage.

(Effects of the present invention) According to the device of the present invention, sewing can be performed automatically without any inconveniences such as rashes, resulting in uniform finished stitching and no need for skilled workers. do.

(Embodiment of the present invention) In the embodiment shown in FIG. 1, a is a sewing machine, and is equipped with a sewing machine needle 1 and a presser metal fitting 2.

Reference numeral b denotes a fabric edge control device installed adjacent to the sewing machine a, which includes an upper fabric control roller 3 and a lower fabric control roller 4, and an upper fabric feed roller 5 in contact with these control rollers 3.4. A lower cloth feed roller 6 is provided. A second upper fabric tension sensor 9 and a second lower fabric tension sensor IO are provided on each of the support shafts 7.8 supporting the feed roller 5.6.

A parallel gripping device C is provided at a distance from the cloth edge control device and grips the upper cloth 11 and the lower cloth 12 in parallel. This parallel gripping device C is provided with an upper cloth guide 13 and a lower cloth guide 11, and a first upper cloth tension sensor 15 and a first lower cloth tension sensor 16 for detecting the tension of these canvases l], 12. We are prepared.

m is a tension motor, and upper cloth 1 gripped by parallel gripping device C
This is for applying a set tension to each of the lower cloth 1 and the lower cloth 12.

Therefore, the canvases 11 and 12 gripped by the parallel gripping device C
are guided under the presser clamp 2 through between the control row 3.4 of the fabric edge control device and the feed roller 5.6. Then, while determining the tension setting value at this time,
The tension motor m is driven according to the set value, and the tension from the parallel gripping device C to the cloth edge control device is specified. In addition,
At this time, the set tension of the upper cloth 11 is detected by FUI, and the set tension of the lower cloth 12 is detected by FLI by the first tension sensor 15.16, and these are input as set values to a controller (not shown) and stored. I'll let you.

When the canvas 11.12 is sewn together in the above state, the cloth 11.12 passes through the control roller 3.4. At this time, due to the frictional resistance of the control roller 3.4, the presser metal fitting 2
Tension is generated between the two. So C5 Upper cloth 11 at this time
Let the tension of the lower cloth 12 be FU2, and the tension of the lower cloth 12 be FL2.

The above tensions FU2 and FL2 are measured by the second tension sensor 9, lO
At the same time, the detected tensions FU2 and FL
2 into the above controller. In this controller, the difference between the tension FU2 and the set tension FUI is FU2-F.
UI, difference FL2-F between tension FL2 and set tension FLI
Calculate LI.

After calculating the difference between both tensions in this way, drive either the upper cloth feed roller 5 or the lower cloth feed roller 6, or both, so that the difference between the two becomes zero. Control is performed so that FUI and FL2 = FL1.

”-1-h sent to presser foot 2 of sewing machine a as shown in
11 and the lower rBj12 are always kept at the set values FUI and FLI, so that the sewing I] of both of them will not be tampered with.

[Brief explanation of drawings]

FIG. 1 is a principle diagram showing an embodiment of the present invention. a... Sewing machine, 2... Presser fitting b... I+j end control device, 3.4... Control roller, 5, 6... Feed roller, 9.10... Second tension sensor, C... Parallel gripping device, 15.16... First tension sensor, m.
...Tension motor.

Claims (1)

[Claims] A cloth edge control device installed near the presser foot of the sewing machine, a cloth parallel gripping device installed at a distance from the cloth edge control device, and a tension motor that applies tension to the cloth from the parallel gripping device to the cloth edge control device. The cloth edge control device includes a pair of control rollers that control the cloth edge, a pair of feed rollers that control the tension of the cloth edge, and a pair that detects the tension of the cloth from the feed roller to the presser metal fitting. and a second tension sensor,
Further, the cloth parallel gripping device includes a pair of first tension sensors that detect the tension between the cloth edge control device and the cloth edge control device, and furthermore, the cloth tension between the feed roller and the presser metal fitting is determined by the tension. A fabric end stitching device equipped with a controller that controls the feed roller to achieve the tension set by the motor.