JPH0956958A - Sewing machine driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically switch the sewing speed so as to simplify sewing work by providing a speed setting device for outputting a variable speed setting signal corresponding to the motion of a sewing machine pedal, and controlling the sewing machine rotating speed to be lower than that of rotation of a sewing machine shaft according to a driving signal output from a low speed switching sensor. SOLUTION: The sewing machine driving device is provided with a speed control device 3 which receives a speed setting signal from a speed setting device 4 connected to a pedal 7 and a driving signal of a driving switch 5 to rotate a motor 2 according to a command. A sewing machine 1 is driven by the rotation of the motor 2 to perform sewing work. When it is impossible to perform sewing at the above sewing machine rotating speed in sewing a corner part or the like, the sewing machine rotating speed is decreased to a low speed preset by a speed control device 3 by the operation of a low speed switching sensor 6 to perform sewing. The low speed sewing period is taken to be the period when the low speed switching sensor 6 is operated, the preset time when the operation of the sensor 6 is predetermined, or the period for a designated number of stitches.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for an industrial sewing machine.

[0002]

2. Description of the Related Art Recently, there has been a demand for efficiency and simplification of sewing work. When changing the sewing speed at the time of sewing, it is generally performed to change the amount of depression of the pedal or manually operate the speed change switch to change the sewing speed.

A conventional sewing machine driving device will be described below. FIG. 4 is a block diagram of a conventional sewing machine drive device. In FIG. 4, 1 is a sewing machine, 2 is a motor, 3 is a speed control device, 4 is a speed setting device, 5 is a drive switch, 7 is a pedal, and 8 is a low speed drive switch.

A sewing machine drive device constructed as described above will be described. First, the speed control device 3 receives a drive signal from the speed setting device 4 connected to the pedal or the drive switch 5, and the motor 2 rotates according to the drive signal command,
The sewing machine 1 is driven to perform sewing work. When sewing at the sewing machine rotation speed when sewing such as corners,
Sewing is performed by lowering the speed command of the speed setting device 4 to decrease the sewing machine rotation speed or operating a speed drive switch to decrease the sewing machine rotation speed to the low speed set by the speed control device 3.

[0005]

However, in the above conventional structure, when performing high-speed sewing to low-speed sewing,
It is necessary to change the depression amount of the pedal so that the speed setting device 4 connected to the pedal is a low speed command, or to operate the low speed drive switch with a hand or a foot, which requires skill in sewing work.

The present invention solves the above-mentioned conventional problems, and is a sewing machine drive device capable of automatically performing high-speed sewing to low-speed sewing and simplifying the sewing operation.

[0007]

In order to achieve this object, a sewing machine drive device of the present invention is provided with a low speed switching sensor capable of automatically switching from high speed sewing to low speed sewing.

[0008]

When the low speed switching sensor operates, the rotation speed of the sewing machine is reduced to the set speed, and the low speed driving time and the number of stitches can be freely set.

[0009]

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

FIG. 1 is a block diagram of a sewing machine controller according to an embodiment of the present invention. In FIG. 1, 1 is a sewing machine,
2 is a motor, 3 is a speed control device, 4 is a speed setting device, 5
Is a drive switch, 6 is a speed change sensor, and 7 is a pedal.

The operation of the sewing machine controller constructed as described above will be described with reference to FIG.

First, the speed control device 3 receives a drive signal from the speed setting device 4 connected to the pedal 7 or the drive switch 5, the motor 2 rotates according to the drive signal command, and the sewing machine 1 drives to perform sewing work. To do. When it is not possible to sew at the sewing machine rotation speed in the sewing of a corner portion or the like, the low speed switching sensor 6 is operated to reduce the sewing machine rotation speed to the low speed set by the speed control device 3 to perform sewing.

A method of operating the low speed switching sensor 6 will be described. As a first method, during sewing, if the sewing manufacturer's hand is under the low speed switching sensor 6 as shown in FIG. 2, said sensor is activated.

As a second method, as shown in FIG. 3, when a reflecting plate is attached to the sewn product and the reflecting plate is below the low speed switching sensor 6, the sensor operates.

In the low speed sewing period, the speed control is performed while the low speed switching sensor 6 is operating, or during the time set by the speed control device 3 and the number of stitches after the sensor is operated. The low speed set by the device 3 is maintained.

As described above, according to this embodiment, it is possible to automatically switch from high speed sewing to low speed sewing.

[0017]

As described above, the present invention is a sewing machine drive device capable of simplifying the sewing work by automatically switching the sewing speed by the low speed switching sensor.

[Brief description of drawings]

FIG. 1 is a block diagram of a sewing machine driving device according to an embodiment of the present invention.

FIG. 2 is a diagram of a first usage example of the low speed switching sensor according to the embodiment of the present invention.

FIG. 3 is a diagram of a second usage example of the low speed switching sensor according to the embodiment of the present invention.

FIG. 4 is a block diagram of a conventional sewing machine drive device.

[Explanation of symbols]

 1 Sewing machine 2 Motor 3 Speed control device 4 Speed setting device 5 Drive switch 6 Low speed switching sensor 7 Pedal 8 Low speed drive switch

Claims (2)

[Claims] 1. A drive mechanism for driving a sewing machine by a motor, and a speed control mechanism for controlling rotation of a sewing machine shaft, wherein the speed control mechanism outputs a variable speed setting signal corresponding to movement of a sewing machine pedal. A sewing machine configured to control the rotation of the sewing machine shaft to a set value by a drive signal from a device and a plurality of drive switches, and to control the rotation of the sewing machine shaft to be lower than the rotation of the sewing machine shaft by a drive signal output from a low speed switching sensor Drive. 2. The sewing machine drive device according to claim 1, wherein the speed control mechanism receives a drive signal output from the low speed switching sensor and can freely set the rotation speed of the sewing machine shaft, the drive time and the number of stitches. .