JPS6317473B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sewing machine that sews, for example, a label, a wafer pen, etc. onto a predetermined workpiece by tracing control along its contour.

[Conventional technology]

For example, when clothing is mass-produced in a sewing factory, labels, badges, etc. are sewn onto the product using a numerically controlled sewing machine. The sewing shape was input, needle movement data was created, this was stored in a programmable ROM or floppy disk, and actual sewing was performed according to this data.

[Problem that the invention seeks to solve]

However, in the conventional method as described above, as the shape to be sewn becomes more complex, it takes a considerable amount of time and effort to create the program, and the peripheral equipment to control the program also tends to become more complex.

Furthermore, since the objects to be sewn, such as labels and emblems, have variations in shape and deviations in set position, it is not possible to accurately form a predetermined stitch at a constant position using constant needle movement data provided by a program. This poses a problem in that it is difficult to stabilize the sewing quality.

In order to improve these shortcomings, for example,
No. 58-38199 discloses a "copy model" control sewing machine, but this cited example does not require the creation of a program, but instead requires the creation of a temporary pattern of the sewing shape each time. There was a drawback.

This invention was made in view of the above-mentioned problems, and it is possible to use a sensor to detect the contour shape of the object to be sewn and to sew a certain distance from it without the need to create a program in advance. It is intended to configure.

[Means for solving problems]

For this reason, in the present invention, a plurality of sensors are used to detect the edge of the cloth or the stepped portion of the cloth outline of the object to be sewn, and sewing is performed along the outline at a certain distance from the detected portion.

〔Example〕

The present invention will be explained below based on examples.
FIG. 1 is a perspective view of essential parts of an embodiment of a copying control device according to the present invention. L is an object to be sewn such as a label (hereinafter referred to as a label), and W is a work such as clothing to which it is sewn. In addition, 1 is the bed of the sewing machine, 2 and 3 are an upper presser foot for restraining the workpiece W and a presser foot base on the lower surface of the workpiece, and 4
Reference numeral 5 indicates a workpiece presser, and 5 indicates a pair of sensor groups 5a and 5b arranged symmetrically with respect to the needle 6 position of the sewing machine.
It is. Each of these sensor groups consists of four sensors S, as shown in FIG.
Alternatively, the reflected light from the label L is detected separately, and based on the combination of the detection signals of the respective sensors, X and Y direction feed control signals for the workpiece W are generated to send the workpiece W in a predetermined direction. FIG. 3 shows a block diagram of a circuit 12 that uses this detection signal 10 to control stepping motors 13 and 14, which drive the workpiece W to be fed in the X direction and the Y direction, respectively, via the microcomputer 11.

Figures 4a to 4g show the suture stitches ST labeled L.
The workpiece/label detection division of each sensor element to form the above is represented by ○/●, and the detection division of each sensor element at each edge/corner of the rectangular level L and the X and label detection divisions of the workpiece W according to FIG. The relationship with Y-direction feed is shown by arrows. The x mark at the tip of the arrow indicates a temporary stop state. The microcomputer 11 of the numerically controlled sewing machine is programmed to drive the workpiece W in predetermined X and Y directions using signals from a combination of sensor outputs.

Note that this sensor may be replaced with an image sensor made of bundled optical fibers.

[Effect]

The operation of the above configuration is self-evident as shown in FIGS. 4a to 4g, and each sensor element according to the present invention completes sewing by following the label outline, regardless of variations in label shape or setting position. and can obtain good sewing quality.

[Other Embodiments] Embodiments according to the present invention are shown in FIGS. 1 and 4.
The arrangement of the sensor groups is not limited to the example shown in the figure, and a single sensor group may be used instead of the pair of sensor groups in the above embodiment. Figure 2b
and c show two examples. Figure 5 is Figure 2b
This is a diagram corresponding to FIG. 4 by a single sensor group shown in FIG. 4, and the operation is similar, so redundant explanation will be omitted.

Furthermore, although the sensor S in the above embodiment has been described as a photo sensor, this sensor is not limited to a photoelectric type, and it goes without saying that it may be based on ultrasonic waves or other types. In addition, although the number of sensor elements has been explained for the case of four sensor elements per group, by increasing the number of sensor elements as shown in Fig. 2c, for example, it is possible to form not only the rectangular label of the above embodiment but also an arbitrary curved contour shape. It can also be applied to sewing objects.

〔Effect of the invention〕

As explained above, according to the copy control sewing machine of the present invention, there is no need for advance programs or copy patterns, so the number of man-hours and time for creating and managing them can be saved, and the contour shape of the workpiece can be shaped easily. Since it is possible to accurately sew at a constant distance from the edge of the object to be sewn regardless of variations in sewing and setting, good sewing quality can be obtained even without special knowledge/skills.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of an embodiment of a copying control device according to the present invention, FIG. 2a is an explanatory diagram of its sensor elements, FIGS. is a block diagram of the workpiece drive control circuit, FIGS. 4a to 4g are diagrams showing the relationship between the detection division of each sensor element and the drive control direction of the workpiece, and FIG. This is a diagram equivalent to Figure 4. 1... Bed, 2... Upper presser foot, 3... Presser foot base, 5a, 5b... Sensor group, 6... Needle, L...
Item to be sewn (label etc.), S...Sensor, W...Work cloth.

Claims (1)

[Claims] 1 Difference between the workpiece and the edge of the fabric or the stepped part of the fabric outline of the workpiece, which consists of a plurality of emitters and light receivers arranged symmetrically around the sewing machine needle and whose base ends are fixed to the sewing machine frame, placed on the workpiece. It consists of a sensor group that detects A copy control sewing machine characterized by controlling a material feeding mechanism.