JPH11104386A - Sensing device for sewing start position of circular cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect sewing start position, by injecting water to cloth at a sewing start position in performing one circumference sewing, after providing the circumference sewing for the cloth, detecting that the sewing starting position reaches a sensing position based on flowing of current through a conductive wire, and stopping the driving of a sewing machine. SOLUTION: A reflection type photoelectric tube 5 is installed on the side of a presser foot 3 and on the sewing surface 4 of a sewing machine 1, and detects whether annular cloth exists or not. A sensing part 20 for a sewing starting position in the intermediate position between the presser foot 3 and a blind over edging ruler 10 is formed with conductive wires 27, 28 on the sewing surface 4. The conductive wires 27, 28 are connected with a positive and negative electrode sides, and are kept in a wire disconnection condition not to flow current. In addition, a water injecting pipe 35 is installed on the side under the presser foot 3 and in the sewing surface 4. When the sewing starting position 54 moves toward the presser foot 3 and a water impregnating part 53 comes into contact with the conductive wire 27, 28 sides, current flows, the sewing start position 54 is detected, and driving of the sewing machine stops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensing device which is capable of easily detecting a starting position of sewing when one-round sewing is performed on an annular cloth.

[0002]

2. Description of the Related Art Conventionally, when an appropriate one-round sewing such as a hem pull sewing is performed on a hem of a tubular underwear such as a shirt, as a means for sensing a position of a first sewing start when the one-round sewing is completed, For example, when the number of rotations (number of stitches) of the sewing machine reaches a predetermined number of rotations, this is sensed and the driving of the sewing machine is stopped.

[0003]

However, as described above, when one round sewing is appropriately performed on a tubular fabric, that is, an annular fabric,
In particular, when there are variations in the circumference of the sewing cloth, such as a knitted cloth having a high elasticity, it is difficult to accurately detect the sewing start position via the number of rotations of the sewing machine (the number of stitches). There were many cases.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a water jet pipe 35 on the side of the presser foot 3 of the sewing machine 1 and in the sewing surface 4 and a presser foot. 3 and on the sewing surface 4 with conductive lines 27 and 28
To form the sensing portion 20 at the sewing start position, and further connect the conductive wires 27 and 28 to the plus (+) and minus (-) electrode sides, respectively.
Are not connected to each other, and each is cut off. In order to perform appropriate one-round sewing on the annular cloth 50, first, water is sprayed on the same cloth 50 at a sewing start position 54, and then the appropriate one-round sewing is performed on the same cloth 50. After applying, the sewing start position is
, The drive of the sewing machine 1 is stopped by the current flowing through the conductive wires 27 and 28, so that the sewing start position 54 can be reliably detected, and the one-turn sewing can be accurately performed. Therefore, sewing errors at the time of one-round sewing as in the related art are eliminated, and sewing efficiency and quality are improved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a sewing machine, reference numeral 2 denotes a sewing needle, reference numeral 3 denotes a presser foot, and reference numeral 5 denotes a reflection-type phototube, which is provided on the sewing surface 4 of the sewing machine 1 on the side of the presser foot 3 and has a circular fabric 50 as described later. When inserted into the lower position of the presser foot 3, the presence or absence of the annular fabric 50 is sensed via the photoelectric tube 5, 10 is a ruler for hem pulling, 20 is a sensing portion of a sewing start position, and 35 is a water jet. Pipe.

The skirt pulling ruler 10 provided in front of the presser foot 3 is formed of a bent piece 11 and a sliding piece 12, and is provided on a suitable support shaft 14 so as to be rotatable.
The bent piece 11 is fixed to the lower end of the. Reference numeral 17 denotes an air cylinder rotatably provided on a suitable support shaft 16, which rotatably connects and supports a piston 18 and a rod 15 of the cylinder 17.

Reference numeral 22 denotes an appropriately fixed air cylinder.
The sliding piece 12 is fixed to a piston 23 of the cylinder 22, and the sliding piece 12 is slidably provided in a fixed piece 25 appropriately fixed on the sewing surface 4.

The sensing portion 20 at the sewing start position is provided at an intermediate position between the presser foot 3 and the hem pulling ruler 10, and the sensing portion 20 is provided with a conductive wire 27 provided on the sewing surface 4.
And 28, and 29 is an insulating member provided in the sewing surface 4, to which conductive wires 27 and 28 are fixed, respectively. Note that the sewing start position sensing unit 20 may be provided in front of the hem pulling ruler 10, that is, the hem pulling ruler 10 is provided at a position in front of the presser foot 3, and is further provided at a position forward of the identification rule 10. It is also possible to provide a sensing unit 20 for the sewing start position.

Further, the conductive wires 27 and 28 are connected to the plus (+) and minus (-) electrodes, respectively.
The conductive wires 27 and 28 are not connected to each other, but are disconnected so that no current flows.

The water jet pipe 35 is provided beside the presser foot 3 and in the sewing surface 4. When the annular fabric 50 is detected through the photoelectric tube 5, the water jet pipe 35 is provided. 35 and the sewing machine 1 are respectively driven simultaneously.

When the water injection pipe 35 operates,
The water injection amount of the pipe 35 is 0.001 to 0.010
The range of CC (cubic centimeter) is preferable, and if it is the lower limit or the upper limit of the same range, the water of the water-impregnated portion 53 in the annular fabric 50 evaporates immediately or it takes a long time to evaporate. The fabric may become dirty or deteriorate, which is not preferable.

When the loop cloth 50 is sewn appropriately once, the sewing start position 54 reaches the position of the hem pulling ruler 10, that is, the number of rotations of the sewing machine (the number of stitches) is counted. When an appropriately provided counter reaches a predetermined count number, the air cylinders 17 and 22 are operated to rotate the bent piece 11 to the original upper position and the sliding piece 12 to the original position. The sewing start position 54 is disengaged from the hemming ruler 10 and moves toward the presser foot 3 in a free state.

When the sewing start position 54 moves toward the presser foot 3 in a free state as described above, that is, when the water-impregnated portion 53 comes into contact with the conductive wires 27 and 28,
The current circuit is closed and the current flows, whereby the sewing start position 54 is detected, and the driving of the sewing machine is stopped at the same time. Therefore, one round sewing of the annular fabric 50 is reliably performed.

In the present invention, besides the hem pulling ruler 10 as described above, for example, a ruler for folding the cloth edge in two or the like may be used. Appropriate sewing such as lock sewing may be performed. Further, as the yarn use of the annular fabric 50, for example, a fabric knitted and woven with a highly absorbent natural fiber such as a cotton yarn is preferable, but of course, it can be sufficiently applied to a fabric using synthetic fiber.

Next, the operation will be described. First, a hem portion of a circularly formed shirt, such as a knitted shirt, that is, a fabric edge of a circular fabric 50 is manually folded into a three-folded shape 51, and a hem pulling ruler 10 is formed. When the fabric 50 is inserted into the inside and the tri-folded fabric 50 is inserted under the presser foot 3, the annular fabric 50 is sensed via the reflective photoelectric tube 5.

Next, the water injection pipe 30 is operated through the sensing of the photoelectric tube 5, and as shown in FIG. 4, water is jetted to the side of the presser foot 3 and to the tri-folded portion 51 of the fabric 50, and The impregnated portion 53 is formed, and the sewing machine 1 is further driven at the same time, and as shown in FIG. 5, the hemming stitch 55 is sequentially applied to the trifold 51 of the annular fabric 50.

After that, the tri-folded portion 51 of the annular fabric 50 is subjected to one-round stitching by the hemming stitch 55, and when the sewing start position 54 reaches the position of the hemming ruler 10, ie, the number of rotations of the sewing machine (sewing speed) When a counter appropriately provided to count the number of counts reaches a predetermined count, the air cylinders 17 and 22 are actuated to rotate the bent piece 11 to the original upper position and to slide. The piece 12 is also returned to the original position, so that the sewing start position 54
Moves toward the presser foot 3 in a free state from the skirting ruler 10.

When the sewing start position 54 moves toward the presser foot 3 as described above, the water-impregnated portion 53 sprayed at the position 54 comes into contact with the conductive wires 27 and 28. Then, the current circuit is closed and the current flows, whereby the sewing start position 54 is detected, the driving of the sewing machine is stopped at the same time, and one round sewing of the annular fabric 50 is completed.

[0019]

As described above, the present invention provides the water jet pipe 35 on the side of the presser foot 3 of the sewing machine 1 and in the sewing surface 4, and at the front position of the presser foot 3 and on the sewing surface 4. The conductive lines 27 and 28 are provided to form the sensing portion 20 at the sewing start position. The conductive lines 27 and 28 are connected to the plus (+) and minus (-) electrodes, respectively.
7 and 28 are not connected to each other, but are each in a disconnected state. In order to perform appropriate one-round sewing on the annular fabric 50, first, water is sprayed on the fabric 50 at a sewing start position 54, and then an appropriate After performing one round of sewing, when the sewing start position reaches the position of the sensing unit 20, the conductive wires 27 and 28
Since the drive of the sewing machine 1 is stopped by applying a current to the sewing machine, the sewing start position 54 can be easily detected, and the one-turn sewing can be accurately performed. This eliminates wearing errors and improves sewing efficiency and quality.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of the entire sewing apparatus according to the present invention.

FIG. 2 is a schematic side view of a partial cross section of FIG.

FIG. 3 is a schematic front view showing a partial cross section of a skirting ruler according to the present invention.

FIG. 4 is a schematic perspective view of a tri-fold annular fabric according to the present invention.

FIG. 5 is a schematic perspective view for explaining sewing of a three-folded annular cloth in the present invention.

[Explanation of symbols]

 5 Photoelectric tube 35 Water injection pipe 50 Ring fabric

Claims (1)

[Claims] A sewing surface (4) beside a presser foot (3) of a sewing machine (1).
A water-injecting pipe 35 is provided therein, and conductive wires 27 and 28 are provided on the sewing surface 4 at a position in front of the presser foot 3 to form the sensing portion 20 at the sewing start position.
And 28 are connected to the plus (+) and minus (-) electrodes, respectively, and the conductive wires 27 and 28 are not connected to each other, but are disconnected. First, water is sprayed on the fabric 50 at the sewing start position 54, and then the fabric 50 is subjected to appropriate one-round sewing. After the sewing start position reaches the position of the sensing unit 20, the conductive wires 27 and 28 are connected. An apparatus for detecting a sewing start position of an annular cloth, wherein the sewing machine 1 is configured to stop driving when an electric current flows.