JPS6056515B2 - sewing machine safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a swinging needle disposed on the front surface of a sewing machine.
This relates to a safety device for sewing machines that operates on the drive control unit to stop or decelerate the sewing machine when a part of the human body, such as a hand or finger, is in danger of touching it.

Conventionally, there are devices that have mechanically installed a guard member on the front of the needle to prevent hands and fingers from touching the needle, but it does not stop electrically, and the guard member also makes it difficult to see the needle base. It was becoming difficult to sew. Additionally, there are some models that have a guard member made of conductive material near the needle base that electrically stops the sewing machine when a human body touches it, but the guard member gets in the way during sewing, causing problems with sewing. . The present invention has been improved in view of the above points. An infrared light emitter is provided near the needle base of the sewing machine, and the output light is used to detect the presence or absence of a part of the human body, and the result is transmitted to the motor speed control circuit. It is an object of the present invention to provide a device which can remove a guard member that has been a hindrance to sewing by controlling the motor drive, and further improves safety.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a perspective view of the present device mounted on a sewing machine body, and FIG. 2 is a block diagram of the present device. As shown in FIGS. 1 and 2, the sewing machine body 1 includes an infrared control circuit 2 consisting of an infrared transmitter 2A and a counter circuit 2B;
Connect and install the activation switch 3 for activating the .
The infrared emitters 4a, 4b, 4c controlled by the infrared control circuit 2 are placed near the needle base 1' of the sewing machine body 1.
Infrared detecting sections 5a, 5b, 5c for detecting the output light from the infrared light emitters 4a, 4b, 4c are arranged on the upper surface of the sewing machine arm 6 in correspondence with the infrared light emitters 4a, 4b, 4c, respectively. 6'. The buried infrared detection parts 5a, 5b, and 5c are connected to an infrared latch circuit 7 mounted on the sewing machine body 1, and the infrared latch circuit 7 is a reset switch that also serves as an infrared latch part 7' and a start switch of the sewing machine. The switch section 8 is further connected to a motor speed control circuit 10 that controls the sewing machine motor 9, and the motor speed control circuit includes a motor control section 11 for applying a brake to the sewing machine motor 9. The embodiment of the present invention is constructed as described above, and when the device is used, the activation switch 3 is
When set to 0N, the infrared control circuit 2 starts operating.

And an infrared transmitter 2A included in the infrared control circuit 2
An output signal is outputted from the counter circuit 2B and sequentially outputted to each of the infrared light emitters 4a, 4b, and 4c.
At this time, since the human movement is included in the frequency range of about 0.1 to 10 Hz, each infrared light emitter 4a, 4b, 4c is rotated once or once within this range.
It must be output over more than one cycle.
By increasing the output of infrared rays, the infrared rays can penetrate through five sheets of thick cloth, so that the cloth becomes the infrared emitters 4a, 4b, 4c.
Even if the light enters between the infrared detectors 5a, 5b, and 5c, the infrared detectors 5a, 5b, and 5c continue to operate. However, if a human hand or finger enters the light emitting range of the infrared emitters 4a, 4b, 4c, the infrared rays will be blocked, and one of the infrared detectors 5a, 5b, 5c will receive an intrusion alarm signal by infrared latch. 7. The signal latched at one end is output to the motor speed control circuit 10, and the sewing machine motor 9 is stopped or decelerated by electrical or mechanical braking. When you want to return to the original speed again, press the start switch on the sewing machine that also serves as the reset switch section 8 of the infrared latch circuit 7.
After determining the presence or absence of a human hand or finger within the infrared projection range, the sewing machine returns to its original speed. It goes without saying that in other embodiments, the infrared emitter and the infrared detector can be configured from one to several sets as necessary. It is also possible to output the infrared rays from the infrared emitters at the same time so that if any one of them is interrupted, an intrusion alarm signal is output.

Furthermore, it is also easy to reverse the mounting positions of the infrared emitter and the infrared detector. The present invention has the above-described structure and function, and by providing an infrared light emitter and an infrared detector for detecting it near the needle base of the sewing machine, it is possible to eliminate the guard member that has hitherto been a hindrance to sewing. There is no need to attach it, so it is easy to see the sewing surface, and there is no fear that the guard member will get in the way during sewing, making sewing easy and easy to operate.Furthermore, it is safe enough for blind people and beginners. be able to.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment in which the safety device according to the present invention is installed near the needle base of a sewing machine, and Fig. 2 is a block diagram of the embodiment of Fig. 1. Fig. A is an infrared light emitting section, and Fig. B is a The infrared detection section is shown. 1... Sewing machine body, 1''... Near the sewing machine needle base, 2... Infrared control circuit, 4a, 4b, 4c...
...Infrared emitter, 5a, 5b, 5c...
・Infrared detection section.

Claims (1)

[Claims] 1 In a sewing machine that is equipped with a motor speed control circuit in the sewing machine body and can electrically control the drive of the sewing machine motor, the sewing machine body has an infrared control circuit built in, and an infrared emitter controlled by the infrared control circuit is attached to the sewing machine needle. An infrared detecting section for detecting the output light of the infrared light emitting body is placed near the source, and an infrared detecting section for detecting the output light of the infrared light emitting body is mounted so as to face the infrared light emitting body, with a sewing object interposed between the infrared detecting section, and the output from the infrared detecting section is A sewing machine safety device that stops or decelerates the sewing machine by transmitting information to the motor drive unit through the motor speed control circuit.