JPS5847197B2 - Jidohou Seiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sewing machine, and particularly to an automatic sewing machine, in which the upper and lower cloths of the sewing fabric are fed out in a direction perpendicular to the cloth feeding direction by separate driving rollers, and the positions are controlled and sewn. The present invention relates to a new automatic sewing machine that can freely change the distance from the edge of the cloth to the curved line.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of essential parts regarding the arrangement of the cloth being sewn, a cloth feed blade, a sewing machine needle, etc., and FIG. 2 is a view taken in the direction of the Z arrow in FIG. 1.

In FIGS. 1 and 2, 11.11a is a cloth feed blade for the upper and lower fabrics 12 for sewing, and 1313a is a fabric edge detector that detects the fabrics above and below the thin plate-like member 14 disposed in front of the sewing machine needle N. 11.11a.

The detector 13 projects light downward, for example, and detects the end of the upper cloth 11 based on the difference in the reflected light beams from the upper surface of the upper cloth 11 and the upper surface of the thin plate member 14.

Further, the detector 13a projects light upward, and detects the difference in the reflected light flux from the lower surface of the lower cloth 11a and the thin plate member 14.
It is designed to detect the edge of the

Furthermore, a roller 15 is provided behind the cloth edge detectors 13, 13a.
, 15a are arranged, and the lower end of each roller 15 and the upper end of the roller 15a are located on each side of the thin plate member 14. It is pressed into contact with the lower cloth 11a.

Furthermore, the rollers 15 and 15a are rotated by a servo motor (not shown) via bevel gears, and the roller 1
The upper cloth 11 is brought out by the rotation of the roller 5, and the lower cloth 11a is brought out by the rotation of the roller 15a in the ±Y direction (perpendicular to the plane of the paper in FIG. 2).

The rotational directions of the rollers 15, 15a are selected to reduce the respective outputs of the cloth edge detectors 13, 13a. In other words, the upper and lower hook cloth edges are always detected by the detector 13.
The upper cloth 11. The position of the lower cloth 11a in the Y direction is controlled.

FIG. 3 shows a state in which the cloth edge detector 13.13a in FIG. 2 is interlocked in the Y direction by the support member 21.

In the figure, a support member 21 is attached and fixed to a moving member 22, and the upper end of the member 22 is screwed into a feed screw 24, which is rotated by a servo motor 25.

A detector 23 is attached to the lower surface of the member 22, and is opposed to the suture curve recorded on the outer peripheral surface of the drum body 26 disposed below.

Incidentally, the drum body 26 is moved in the cloth feeding direction (X direction) in conjunction with the vertical movement of the sewing machine needle N.
It is assumed that the drum rotating shaft is connected to the motor for driving the sewing machine needle N via a deceleration mechanism (not shown) so that the cloth feeding speed corresponds to the circumferential speed of the outer circumferential surface of the drum.

FIG. 4 is a block diagram for explaining the operational functions of the device of the present invention.

In the figure, the pattern of the suture curve recorded on the outer periphery of the drum body 26 is detected by the detector 23, and the output of the detector 23 is given to the controller 31, which drives the servo motor 25 so that the pattern is always connected to the detector 23. The position of the feed drive system 33 is controlled to match.

32 is a tachometer generator for speed feedback.

Since the cloth edge detector 13 is moved integrally with the detector 23, it is forcibly displaced relative to the cloth edge.

Therefore, the controller 34 applies the output of the cloth edge detector 13 to the servo motor 35, and the cloth is fed out in the Y direction by the roller 15 coupled to the servo motor 35 so that the displacement is reduced.

36 is a tachometer generator. Figure 5 shows the top and bottom of this device.
The dotted line showing the state in which the lower fabric is sewn together is the stitching curve.

As shown in the figure, the sewing machine needle N can be positioned at an arbitrary distance l from the edge of the fabric.

As described above, according to the present invention, by recording and placing a previously specified sewing curve on the outer periphery of the drum body, the upper and lower fabrics can be sewn along the sewing curve.

That is, stitching can be performed such that the distance from the edge of the cloth takes an arbitrarily changed value.

In the apparatus of the present invention, a reflected light beam is used as the cloth edge detector, but an air micrometer or the like may also be used.

Furthermore, although the cloth edge detectors 13 and 13a are interlocked in the Y direction by the support member 21, electrical interlocking operation may be adopted.

Furthermore, in the present invention, the detection method of the detector facing the suturing curve recorded on the outer periphery of the drum body may be an optical method, or may be a magnetic sheet or magnetic head method.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main part near the suture part of the device according to the present invention;
Fig. 2 is a view from the Z arrow in Fig. 1, Fig. 3 is a mechanism diagram for driving the cloth edge detector, Fig. 4 is a block diagram explaining the operational functions of the device of the present invention, and Fig. 5 is a stitched cloth. It is a figure showing the suturing curve of. 11.11a... Upper cloth, lower cloth, 12...
・Cloth feed blade, 13, 13a... Cloth edge detector, 1
4... Thin plate member, 15, 15a...
Roller, 21...Supporting member, 22...
Components, 23...Detector, 24...Feed screw, 25...Servo motor, 26...
・Drum body, 31.34... Controller, 3
2, 36... Tachometer generator, 33...
Feed drive system, 35... Servo motor.

Claims (1)

[Claims] 1 A drum body that rotates in synchronization with the vertical movement of a sewing machine needle and has a suturing curve recorded on its inner surface, and a drum body that is disposed opposite to the drum body surface and that feeds the cloth from the suture curve. a first detection head that emits an output signal corresponding to a deviation in a direction (defined as the Y direction) perpendicular to the direction (defined as the X direction); a servo drive unit that drives the detection head and its support member in the Y direction so as to match the detection head; A pair of second detection heads are installed and are fixedly arranged between the upper cloth and the lower cloth in the vicinity of the second detection heads, which emit output signals corresponding to either of the Y directions from each end of the upper and lower cloths, respectively. a first roller that presses into contact with the upper cloth placed on the upper surface of the thin plate-like member and, by its rotation, draws out the upper cloth in the Y direction; A second roller presses into contact with the placed lower cloth and rotates to push out the lower cloth in the Y direction, and the first roller is moved in a predetermined direction by the output of the upper cloth detection head of the second detection head. 1. An automatic sewing machine comprising: a first servo motor that rotates in a predetermined direction; and a second servo motor that rotates the second roller in a predetermined direction by the output of the lower fabric head.