JPS61206478A - Apparatus for guiding article to be sewn of sewing machine - 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 workpiece guide device for a sewing machine for forming a seam while maintaining a predetermined distance from the edge of a workpiece, particularly a sewing cloth. Regarding.

[Conventional technology and problems]

A first example of a conventional guide device will be explained based on FIG. 8. In order to form a seam A along the edge at a distance R from the edge 1a of the cloth 1, a gear 2 having an axis of rotation parallel to the feeding direction is pressed onto the cloth 1 in front of the sewing needle, and a light emitter 3. A sensor 5 equipped with a photoreceptor 4 detects the edge 1a. Then, a seam A is formed at a seam position that is moved forward in the cloth feeding direction by the cloth feeding means at the middle seam part of the cloth 1. However, in this conventional example, the gear 2 rotates to act on the cloth 1 in a direction perpendicular to the feeding direction.Next, as a second conventional example, a guiding device shown in Japanese Patent Publication No. 1276-1980 is used. be. In this method, a guide edge is provided on a predetermined feed line where the edge of the cloth is to be placed, the direction of the roller is fixed in the direction where the extension line in the rotational direction intersects with the guide and edge, and the roller is supported so as to be freely rotatable. When the fabric is fed by the fabric feeding device of the sewing machine, the roller that presses the fabric also rotates, moving toward the guide edge, which is the direction of rotation of the roller relative to the fabric. A feeding force of is applied, so that the fabric is guided in the feeding direction along the guide edge.

However, with this device, if the fabric is thin and soft, the fabric will bend and wrinkle when pressed against the guide edge, making it impossible to form stitches at predetermined intervals from the edge.

・ In addition, when the edge of the fabric is not straight but has steep irregularities, the edge of the fabric is detected by a non-contact sensor, and a roller is used to guide the fabric, and this roller is moved to one side or the other with the center in the fabric feeding direction. This is an attempt to change and control the direction of the other direction.

[For production]

With this configuration, the roller that presses the cloth is rotated by the cloth feeding action, and the rotation direction of this rotating roller, which changes according to the detection signal of the cloth detection means, causes the cloth to be rotated in one direction perpendicular to the feeding direction or in the other direction perpendicular to the feeding direction. Feed force is applied in the other direction,
The cloth is sewn always keeping a distance of one wax from the edge.

〔Example〕

An embodiment of this laochie will be explained based on FIGS. 1 to 6.

Incidentally, the same part as the conventional example is provided with the base 12 spaced apart to one side from the cloth feeding line passing through the body 25 having the same reference numeral. At one end of this base 12 (right end in Figure 3) is a table 1.
A holding portion 13 having a U-shaped vertical cross section is provided at a distance above the upper surface of the holding portion 13 .

The other end of the base 12 is fixed to the machine frame and in the cloth feeding direction: lX
^ Shi No. 7 Freedom 1 9 IP
'6'+ l ff fFil lih n
T base t-rr zu- yuki + , supports rotatably a 5-shaped oscillating body 15, and a pressing spring 20 is mounted on the support shaft 14 between the oscillating body 15 and the upper horizontal plate portion.
Wrap it around. A needle drop point 1 is located at the tip of one arm of the oscillating body 15.
It is usually located on the cloth feeding line passing through 6 and along the cloth feeding direction.
- supports the roller 10 in a freely rotatable manner; One end of the connecting link 18 is rotatably supported at the tip of the other arm 17 of the rocking body 15, and the torque rotates the crank arm 19 to move the connecting link 1B back and forth, and the rocking body 15 rotates the support shaft 14. The rotation axis (rotation direction) can be changed so that the roller 10 rotates around the cloth feeding direction in one direction or the other. Figures 2 and 3). 21', QZ v'f-'7'#
11 K"?,-"PIEf,:""'1 Press the upper cloth 1 between the upper surface and the roller 0, and place it on the lower surface of the 1st plate 21 and the lower surface of the sewing machine table 11] Roll 1 of the aj cross guide device
A standing plate 12b is provided at the center of the lifting base 12, and a piston 23 is rotatably supported at the upper end of the standing plate 12b.
A horizontal support shaft 24 is provided at the rear end of the cylinder 22 which is integrated with the piston 23.
is rotatably supported, and both ends of the support shaft 24 are connected to the machine frame 12.
(The sewing machine table 11 is supported horizontally on i. Here,
When the piston 23 is pulled into the cylinder 22, it pulls the base 12 upward through the standing plate 12b, so the base 12 rotates upward around the support shaft 12a, and the roller 0 moves upward from the middle plate 21. evacuate to. When the piston 23 is extended and the base 12 is pushed down via the standing plate 12b, the roller 0 supported by the base 12 descends and the upper fabric 1
, and presses the cloth 1. Reference numeral 25 denotes a sensing body for detecting the edge of the cloth 1, and the sensing body 25 for the upper cloth and the sensing body for the lower cloth are arranged vertically opposite to each other via a reflecting plate 26 having reflective surfaces formed on the upper and lower sides. . The detection body 25 includes two sets of a light emitter and a light receiver. Each light emitting body and light receiving body are provided with a reflecting plate 26.
The detection light from the emitter is not reflected by the photoreceptor at the detection point, x.

If cloth 1 is thrown over Y, the detection light of the light emitter (total light) will be detected by the photoreceptor, and if there is an edge of the cloth at the detection point, the detection light will be reduced to the photoreceptor compared to when it is totally reflected. Light is detected.

Electrical control of the guide device having the above configuration will be explained based on the block diagram shown in FIG. 9. 100 is a CPU that causes the device to perform predetermined operations according to input signals;
is a ROM that stores command information (FIG. 6) which will be described later. Reference numeral 102 indicates a starting signal for operating this device, 103 indicates a detection signal emitted from the detection body 25, and 104 indicates a cylinder 22.
opening/closing electromagnetic device, 6 is the stepping motor, 106
10 is a sewing machine motor for operating the sewing machine, and 10T is a cloth feed speed detector which will be described later as another embodiment.

Next, the operation of the present invention is illustrated in FIGS. 4A to 4C) The rotational direction of the roller 10 is controlled in the cloth feeding direction (FIG. 6).
.

Next, when there is no cloth 1 on the detection point . Cloth 1 is being transported in the cloth feeding direction by a cloth feeding mechanism of a sewing machine. The row 210 is rotated by the movement of this cloth 1,
Since the roller 10 rotates in the right direction with respect to the cloth feeding direction, the cloth is further fed rightward while being transported in the cloth feeding direction. Then, the edge 1a of the cloth was placed on the detection point X.

At this time, the detection signal X2 is detected. Then, the detection signal at the detection point Y detects one of Yl, Yl, and Y3, and in the case of Yl, the roller 10 is driven in the right direction, and in the case of Yl, the roller 10 is driven in the cloth feeding direction, and in the case of Y3, the roller 10 is driven in the cloth feeding direction. In this case, the roller 10 is driven leftward and detects a detection point Y, which is a point. Thereafter, the roller 10 is driven in the same manner as described above, and the detection point is further moved to X.

Y and (by changing, the cloth edge 1b is the detection point X.

The drive is controlled so that it appears on Y.

[Other Examples]

The roller 10 of the above embodiment was attached to one arm of the L-shaped swinging arm 15, and as shown in FIG. The roller mounting portion 15b of the rocking body 15 of the above embodiment is arranged substantially on the same line.
Even if it is attached to the opposite side, the cloth 1 can be controlled in the direction of the roller.

If the feed speed is slow, the pulse motor can be set to a higher speed (or by increasing the rotation angle of the roller, it is possible to quickly control the cloth guidance.Also, when the sewing machine is running at high speed, supports the roller of the mouth roller so that it can rotate freely, and the rotation direction of the roller can be arbitrarily controlled.
Compared to using gears, it prevents the material from stretching, prevents the edges of the fabric from fraying, and allows sewing to be done at a fixed point from the edge of the fabric by following sudden irregularities on the edge of the fabric. In addition, since the edges of the cloth can be detected without contact and no guide edges are used, there are various effects such as no bending of the cloth.

[Brief explanation of the drawing]

Fig. 1 is a front view of a sewing machine equipped with a sewing machine 6 material guide device, Fig. 2 is an enlarged plan view of the device, and Fig. 3 is a sewing machine with the same device installed on the machine table for upper and lower fabrics. FIG. 4 is an enlarged front view showing that the rollers 15, oscillator 21, and
・Middle plate 25...Detection object 26...Reflector plate
"R... Length from cloth edge to seam position X, Y... Detection point

Claims (2)

[Claims] (1) The material to be sewn is pressed in front of the seam forming position and is rotatable around an axis perpendicular to the fabric feed line, and supported on a base so that the crossing angle can be changed to one side or the other. It consists of a guide roller, a detection means that is arranged on a predetermined fabric edge line and detects the edge of the workpiece without contact, and a drive control means that changes the angle of the guide roller based on a detection signal from the detection means. Sewing material guide device for sewing machines. (2) A workpiece guide device for a sewing machine according to claim 1, wherein the detection means are provided at two locations parallel to the cloth feed line.