JPH0631363Y2 - Opening / closing detection circuit for positioning contact group - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an electric circuit for detecting the detachment of a movable member held at a stable position by a spring, gravity or the like from the stable position.

<< Prior Art >> As a support structure for always holding a movable member at an accurate position, a structure for supporting the member by a hole, a groove, and a plane has been used for a long time. This support structure is based on the principle that the steady position of a member can be accurately maintained by regulating the three-dimensional position and three-dimensional posture of the member. Holes are three-dimensional, grooves are two-dimensional, and planar. Functions as a one-dimensional support pair, and has a structure in which a hole is supported at three points, a groove is supported at two points, and a plane is supported at one point.

If the supported member moves away from the normal position, the above 3 + 2
Since at least one of the +1 points will be separated from each other, these supporting points are constituted by electric contacts and the opening and closing of the contacts are electrically detected to thereby separate the member from the steady position. Can be detected.

As a conventional structure based on this principle
Japanese Patent No. 48 discloses NAND of each contact using a NAND element.
A circuit for detecting the detachment of a member from a steady position depending on conditions is disclosed.

<Problems to be solved by the invention> However, in the above structure, the number of inputs for testing the NAND condition is at least 5, and there is a constraint that a NAND element having 5 or more input terminals must be used. Since the number of input wirings to the element also increases, there is a problem that the mounting work is troublesome.

Therefore, the object of the present invention is to make it possible to detect the separation of the contact points at the six points by testing a smaller number of inputs, thereby reducing the cost of the parts used and facilitating the wiring mounting work.

<< Means for Solving the Problem >> The movable member 10 according to the present invention includes one protruding contact 11
And one receiving contact 21 and one point contact pair 1, one protruding contact 12 and two receiving contacts 22a, 22b 2
Point contact pair 2 and one protruding contact 13 and three receiving contacts 2
It is supported at a stable position by three contact pairs of the three-point contact pair 3 including 3a, 23b, and 23c. To disengage the movable member 10 from the stable position, the protruding contact 11 of the one-point contact pair 1 is connected to the detection power source 6, and one contact 31 of the one-point contact pair 1 and two of the two-point contact pair 2 are connected. Of the circuits 41 and 42 in which the contacts 32a and 32b of 3 are connected in series to one of the receiving contacts 23c of the three-point contact pair 3 and the remaining two receiving contacts of the three-point contact pair 3 are connected. It is detected by detecting the NAND conditions of 23a and 23b with a 2-input NAND element.

<< Operation >> Device for detecting NAND condition (usually NAND element) 7
The power for the input signal to the
A circuit in which two contacts 32a and 32b of the one- and two-point contact pair 2 and one contact 33c of the three-point contact pair 3 are connected in series (5
1, 41, 42) by the three-point contact pair 3 of the protruding contact 13
Is given to. The other two contacts 33 of the three-point contact pair 3
If a and 33b are also separated from each other, the AND condition of the inputs of the NAND element 7 is broken. On the other hand, the contact 31 of the one-point contact pair,
If the two contacts 32a, 32b of the two-point contact pair and the one contact 33c of the three-point contact pair 3 are separated by even one place, N
Power is not supplied to the input terminal of the AND element 7, and therefore in this case as well, the AND of the input of the NAND element 7
Conditions collapse.

Therefore, if any one of the six contact points is separated, the AND condition of the input of the NAND element 7 is broken and the separation of the member from the steady position is detected, and the number of inputs to the NAND element 7 is A minimum of 2 inputs will be sufficient.

<< Embodiment >> FIG. 2 shows a supporting structure of a movable member 10 in which the circuit of the present invention is adopted, and this structure itself is known. Three protrusions are fixed to the movable member 10 via electrical insulating materials 11a, 12a, 13a arranged at positions deviated from a straight line, and each of them serves as a protruding contactor 11, 12, 13.

An insulating plate 40 that faces the movable member 10 is provided on the base 20 that supports the movable member 10. The insulating plate 40 faces the protruding contacts 11, 12, and 13 and has a flat surface, a groove, and a hole. Is provided. The plane is formed by the metal plate 21 fixed to the insulating plate 40, the groove is formed by two metal rails 22a and 22b fixed on the insulating plate 40, and the holes are three metal hemispheres fixed on the insulating plate 40. It is formed of 23a, 23b, and 23c. And one of plate 21 and rail 2
2a is electrically connected by a conductive pattern 41 formed on the insulating plate 40, and the other rail 22b and the hemisphere 23 are connected to each other.
23c are electrically connected to each other by a conductive pattern 42 formed on the insulating plate 40, and the other receiving contacts (hemispheres, rails and plates) are insulated from each other by the insulating plate 40. There is. Then, the conductor 51 is drawn out from the protruding contactor 11 facing the plate 21, and the conductors 52 and 53 are also connected from the other two receiving contacts 23a and 23b of the three-point contact pair 3 via the conductive patterns 43 and 44. Has been pulled out.

Reference numeral 4 is a coil spring that biases the movable member 10 toward the base 20, and 5 is a detection needle that is integral with the movable member 10. In a steady state, the movable member 10 contacts the biasing force of the spring 4 and the three contact points. It is held in a stationary position by pairs 1, 2, and 3,
When an object to be detected comes into contact with the tip of the detection needle 5, the contact causes the movable member 10 to be displaced from the steady position, and at least one of the six contacts 31 to 33c is separated.

FIG. 1 is a diagram showing a circuit configuration of the present invention for detecting the separation of the contacts 31 to 33c, in which 6 is a battery and 7 is a NAN.
D element, 8 is a switching element, and 9 is a display device (for example, LED).

When the movable member 10 is in the steady position, the input end of the NAND element 7 is connected to the contacts 6 and 1 of the one-point contact pair from the battery 6.
Point-contact pair contacts 32a, 32b and three-point contact pair contact 3
The voltage (or current) applied to the protruding contact 13 of the three-point contact pair via 3c causes the other two contact points 33a of the three-point contact pair,
Since it is applied via 33b and the AND condition of the input is satisfied, the output of the NAND element 7 becomes L level and the display device 9 does not operate.

On the other hand, when the movable member 10 is separated from the steady position, the AND of the inputs of the NAND element 7 is applied as described in the above section.
Since the condition is broken and the output level of the NAND element 7 becomes the H level, the switching element 8 becomes conductive and the display device 9
Operate.

As a result, the distance from the stationary position of the movable member 10 is immediately displayed by the display device 9, and in the illustrated device, the contact between the detection needle 5 and the object to be detected is immediately detected.

<Effect of the Invention> According to the above-described invention, a simpler structure can be obtained that electrically detects the detachment of the movable member supported by the hole, the groove, and the plane at the stationary position from the stationary position. Since the cost can be made cheaper and the wiring mounting work can be simplified, it is possible to provide a highly reliable contact detection device at a lower cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration of the present invention for detecting separation of contacts, and FIG. 2 is a perspective view showing a supporting structure of a movable member in which the circuit of the present invention is adopted. In the figure, 1, 2 and 3: contact pairs, 7: NAND element 10: movable member, 11, 12, 13: protruding contact 21, 22a, 22b, 23a, 23b, 23c: receiving contact 31, 32a, 32b , 33a, 33b, 33c: Contact

Claims (1)

[Scope of utility model registration request] 1. A projecting contact (11) and a receiving contact (21).
Consisting of a one-point contact pair (1), one protruding contact (12), two receiving contacts (22a), (22b) consisting of a two-point contact pair (2) and one protruding contact ( 13) and three receiving contacts (23a), (23b), (23c) three-point contact pair (3) contact point group for detecting the detachment from the stable position of the movable member (10) In the open / close detection circuit, the salient contactor (11) of the one-point contact pair (1) is connected to the detection power supply (6), and one contact (31) and two points of the one-point contact pair (1) The tip of the circuit in which the two contacts (32a), (32b) of the contact pair (2) are connected in series is connected to one (23c) of the receiving contacts of the three-point contact pair (3). Two remaining contactors of three-point contact pair (3)
Depending on the 2-input NAND conditions of (23a) and (23b), the movable member (1
(0) detecting the departure from the stable position,
Opening / closing detection circuit for positioning contact group