JPH07302524A - Noncontact foot switch - Google Patents

Abstract

PURPOSE:To prolong the life of a foot switch by making a switch part of a self-retaining foot switch be a non-contact type, in which the input of a switch is received by a relay and a signal is held and then the signal is cut by a second input, and using a non-contact relay for an output part. CONSTITUTION:When force is applied to a foot switch in the direction shown by the arrow, the switch is stopped at the stopper 5 and a proximity switch 1 senses a foot metal tool 7 and the resulting input signal is taken to a non- contact relay 3. whether the signal should be retained or not is determined by a circuit built in an installation board 4 for a non-contact point and output to the outside is done by the non-contact point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foot switch used in machine tools and the like.

[0002]

2. Description of the Related Art Among switches, a foot switch is used in many fields because it has the advantage that a foot can be used to operate a machine even when both hands cannot be used in a machine tool or the like. The practical foot switch had a simple structure in which the internal limit switch was turned on when the foot was stepped on, and turned off when the foot was released.

[0003]

However, since the inside is a limit switch, the limit of use (mechanical life) has been determined, and since there is a contact surface between the foot metal fitting and the limit switch, the metal fitting may be broken, or the electromagnetic Opening and closing also has the drawback of a short service life, which is below the limit of use due to many welding accidents such as arcs. Further, there is a condition that the operation of the machine or the like does not turn on unless the internal limit switch is turned on, so that the foot cannot be separated from the foot switch during the operation of the machine.

[0004]

As a remedy for this problem, there is a method in which a proximity switch is used in the switch section, the contact surface is eliminated, and the input signal is output to the outside by a non-contact relay.
The present invention is as easy to handle as the conventional one, the cost is not so different, and it can be applied to both AC100V and 200V.

Further, by receiving the input signal of the proximity switch by the relay, the signal can be held and the drip-proof property is excellent.

[0006]

EXAMPLE An example will be described with reference to FIG.
When a force is applied to the foot switch in the direction of the arrow, it is stopped by the stopper (5), the foot switch (7) is detected by the proximity switch (1), and the input signal is taken into the contactless relay (3). Whether the signal is held or not is judged by the circuit assembled in the non-contact mounting base (4) and output to the outside without contact.

[0007]

Since the present invention is configured as described above, it has the following effects.

There are two types of foot switches, a long-life type that does not require replacement of parts because it has no contact portion and output is non-contact.

[Brief description of drawings]

FIG. 1 is an overall perspective view.

FIG. 2 is a cross-sectional view of the main body AA.

[Explanation of symbols]

 (1) Proximity switch (2) Proximity switch fixing bracket (3) Solid state relay (4) Solid state relay mounting base (5) Stopper (6) Spring (7) Foot fitting

FIG. 3 is a circuit configuration diagram of a signal non-holding type.

FIG. 4 is an operation flowchart of a signal non-holding type.

FIG. 5 is a signal holding type circuit configuration diagram.

FIG. 6 is an operation flowchart of a signal holding type.

Claims (2)

[Claims] 1. A self-holding type foot switch that receives a switch input by a relay, holds a signal, and cuts the signal by a second input. 2. The foot switch according to claim 1, wherein the switch part of the foot switch is a proximity switch and the detection part is non-contact, and a non-contact relay is used for the output part.