JPS6016968Y2 - Mobile object position detection device - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a device for detecting the position of a moving object.
In particular, the present invention relates to a device that uses a non-contact switch to provide a memory function and a power failure protection function.

Conventional position detection devices memorize the position of a moving object using an external force return type limit switch, but have the disadvantage that the permissible speed of the moving object is low due to the mechanical limitations of the limit switch.

In order to increase this permissible upper limit speed, the present invention uses a non-contact switch instead of the external force reset type limit switch to obtain the memory function and power failure protection function similar to the external force reset type limit switch system.

FIG. 1 shows the arrangement of the contactless switch and a moving object to be detected.

In the figure, 1 and 2 are magnetically actuated non-contact switches, 3 is a moving body, and 4 is a proximal piece, which is activated when approaching the non-contact switches 1 and 2.

The moving body 3 moves in the directions of arrows 5 and 6. The length L of the proximity piece 4 is approximately the same as the distance between the two non-contact switches 1 and 2, and this is determined according to the moving speed of the moving body 3.

2 shows a detection circuit, 11 is a contact of the non-contact switch 1 shown in FIG. 1, 21 is a contact of the non-contact switch 2 shown in FIG. In other words, it is in a demagnetized state.

The contact 21 is the movable contact 2 when the switch 2 is in the energized state.
1a is configured to contact the fixed contact 21b, and when the switch 2 is in the demagnetized state, the movable contact 21a is configured to contact the fixed contact 21b.On the other hand, the contact 11 is configured so that when the switch 1 is in the energized state, the movable contact 11a is fixed. When the switch 1 is in the demagnetized state, the movable contact 11a becomes the fixed contact 11.
b.

7 is a latch relay, symbol S indicates a set coil, and symbol R indicates a reset coil, respectively.

Note that 8 is a power supply for the relay.

When the movable body 3 located further to the right of the non-contact switch 2 in FIG. 1 moves from the right side in the direction of arrow 5, the non-contact switch 2 is first excited, and the movable contact
A contacts the fixed contact 21b.

Therefore, the set coil S of the latch relay 7 is excited,
The latch relay 7 is set.

When the moving body 3 moves further and the non-contact switch 2 becomes non-energized, and the non-contact switch 1 becomes energized, the movable contact 2
1a contacts the fixed contact 21c, and the movable contact 11a contacts the fixed contact 11c.

Therefore, the reset coil R of the latch relay 7 is energized and changed to the reset state.

Even if the contactless switches 1 and 2 become non-energized by moving further to the left, the latch relay 7 maintains the reset state.

That is, when the moving body 3 is on the left side of the non-contact switch 1 in FIG. 1, the latch relay 7 is in the reset state.

Next, when the moving body moves from the left side in the direction of arrow 6 in FIG. 1, the non-contact switch 1 is first excited, the reset coil R of the latch relay 7 is excited, and the moving body 3 further moves to the right. The non-contact switch 1 becomes non-energized, and the non-contact switch 2 changes to an energized state.

Even if the non-contact relays 1 and 2 are both de-energized by moving further to the right, the latch relay 7 maintains the set state.

That is, when the moving object is on the right side of the non-contact switch 2 in FIG. 1, the latch relay is in the set state.

Since the set-reset state is maintained even if the relay power supply fails, it can have a power failure protection function like an external force reset type limit switch.

In this way, it is possible to detect and store the position of a moving object using a contactless switch, and also to provide a power outage protection function.

Although the above-described embodiment shows an example in which the position is detected magnetically, the same effect can be achieved by, for example, detecting the position optically and using a photoelectric switch that responds in response to the detection result.

In this way, this invention uses a non-contact switch and a latch relay that responds to the operation of the non-contact switch, so it has the memory function and power outage protection function of the conventional device, and allows the moving object to move at a high allowable speed. A body position detection device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an outline of an embodiment of this invention, and FIG. 2 is a circuit diagram showing a main part of the device shown in FIG. In the figure, 1 and 2 are contactless switches, 11 and 12 are contacts, 3 is a moving body, 7 is a latch relay, S is a set coil, and R is a reset coil. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Scope of utility model registration request] (1) First and second elements are disposed at a predetermined interval and operate independently of each other without contacting the movable body at predetermined corresponding positions with the proximal piece attached to the movable body. A position detecting device for a mobile body comprising a contact switch and a latching relay that is set by actuation of one of these switches and reset by actuation of the other. (2) The proximity piece is made of a magnet, and the contactless switch is a magnetic proximity switch that operates by detecting the presence or absence of the magnetic signal from the magnet. position detection device for mobile objects. (3) The position detecting device for a moving body according to claim 1, wherein the contactless switch is a photoelectric switch that operates by detecting the presence or absence of an optical signal from the proximal piece.