JPH023245B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a passing direction memory switch for a rotating or moving body.

[Prior art]

Conventionally, in a mechanism where the rotation axis rotates ±180 degrees from the 0 degree position, when attempting to rotate from a certain rotation angle position to the 0 degree position, the direction of rotation is determined by determining the +- rotation range as shown in Figure 7. The direction of rotation was determined by detection using a combination of a working dog 10, a proximity switch 11, etc. However, if the rotating shaft 1 is located at 180 degrees, there is a drawback that it is not possible to detect whether it has been rotated by +180 degrees or -180 degrees.

In addition, a measuring device with a memory type magnetic proximity switch that detects the passage of the needle by installing a detection memory section consisting of a reed switch and a bias magnet, and a detection magnet in the needle was put into production in the 19th century.
This is proposed in Publication No. 57-17415, but the content of this publication is to fix a magnet to a needle that can rotate in a circle and place the needle in any position, and to use it in combination with a bias magnet to turn the reed switch ON or OFF. , a reed switch with a magnet fixed to the other moving needle.
It is either OFF or ON, and there is no thought or method for determining direction.

[Purpose of the invention]

In view of the above drawbacks, the present invention has a simple structure that combines a detection storage unit consisting of a reed switch and a bias magnet, and a detection target magnet arranged with the same polarity and opposite polarity as the bias magnet. The purpose of the present invention is to propose a passing direction memory switch that detects the passing direction.

[Structure of the invention]

The present invention consists of a reed switch, a detection storage section consisting of a bias magnet, and a magnet for detection,
Arrange the bias magnet in a position where the state of the reed switch can be maintained, arrange the detection magnet with the same polarity and opposite polarity as the bias magnet, and rotate or move either the detection storage section or the detection magnet. The reason lies in the fact that the other is placed on the body as an immovable object.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments. As shown in FIG. 1, the passing direction memory switch fixes a disk-shaped rotating body 2 to a rotating shaft 1, fixes magnets 3, 4, and 5 for detection on the rotating body 2, and places them close to the outside of the rotating body 2. A detection storage section 6 is arranged, and the detection storage section 6 is composed of a reed switch 7 and a bias magnet 8, and is connected to the rotating body 2.
This constitutes a passing direction memory switch that detects the passing direction of the detected magnets 3, 4, and 5 due to the rotation of the magnets.

The polarities of the magnets 3, 4, 5 for detection and the magnet 8 for bias are, for example, the magnets 3, 4, 5 for detection on the side facing the bias magnet 8 fixed horizontally from the left with N pole and S pole. They are arranged facing each other with the same polarity and opposite polarity so as to form N pole, S pole, and N pole, respectively. The bias magnet 8 cannot switch the reed switch 7,
It is located in a position where the status can be maintained.

The operation of the passing direction memory switch configured as described above is such that the rotating body 2 rotates counterclockwise from the left side to the right side as shown in FIG.
When the magnets 5 and 4 to be detected face the bias magnet 8, the polarity arrangement is opposite when viewed from the reed switch 7, so the magnetic force acting on the reed switch 7 is reduced and the reed switch 7 is turned off. ,
Immediately after that, when the magnets 4 and 3 for detection face the bias magnet 8, the magnets 4 and 3 for detection are immediately before passing.
, the polarity of the bias magnet 8 is set to the reed switch 7.
When viewed from above, the polarity is the same, the magnetic force increases, and the reed switch 7 turns ON.After that, the contact piece 7a of the reed switch 7 is brought closer to the bias magnet 8, so the magnetic force overcomes the spring force of the contact piece 7a. hand
Keep it in the ON state and memorize it.

Next, as shown in FIG. 3, when the rotating body 2 rotates clockwise from the right side to the left side and the detected magnets 3, 4, and 5 pass, the detected magnets 3, 4 face the bias magnet 8. When viewed from the reed switch 7, the polarity becomes the same, so the magnetic force increases and the reed switch 7
When the magnets 4, 5 to be detected face the bias magnet 8, the polarities of the magnets 4, 5 to be detected and the bias magnet 8 are opposite to each other when viewed from the reed switch 7 immediately before they pass. , the magnetic force decreases and the contact piece 7a of the reed switch 7 is separated from the bias magnet 8, so the spring force of the contact piece 7a overcomes the magnetic force and turns OFF, after which the reed switch 7 is held in the OFF state and stored. .

The signal stored in the ON/OFF state of the reed switch 7 is used as it is as a signal for the rotational direction of the rotating body 2, that is, the passing direction of the magnets 3, 4, and 5 to be detected. The order of is OFF→
When ON, the rotating body 2 rotates counterclockwise as shown in Figure 2, and when ON→OFF, the rotating body 2 rotates counterclockwise as shown in Figure 3.
It is possible to distinguish and detect that the reed switch 7 is rotating clockwise, and the signal from the reed switch 7 may be used by inputting it to the gate of a reset digital circuit.

Furthermore, as mentioned above, since the signal is always turned on once in either direction when passing, passage can be determined by this signal, and both passing and memorization signals can be obtained.

The polarities of the magnets 3, 4, and 5 to be detected are arranged so that they have opposite polarities and the same polarity as the north and south poles of the bias magnet 8, respectively.
The configuration may be such that the switching changes from ON to OFF in FIG. 2 and from OFF to ON in FIG. 3.

4 and 5 show other embodiments in which two magnets 3 and 4 to be detected are fixedly arranged horizontally on the rotating body 2, and as shown in FIG. 4, the magnets 3 and 4 to be detected are on the left side. When passing counterclockwise to the right, the reed switch 7 is turned OFF when the detected magnet 4 faces the bias magnet 8, and immediately after that, the reed switch 7 is turned OFF when the detected magnet 3 faces the bias magnet 8. is turned on and stored.

In FIG. 5, when the detected magnets 3 and 4 pass clockwise from the right side to the left side, the reed switch 7 is turned on when the detected magnet 3 faces the bias magnet 8.
It turns ON, and then the detected magnet 4 faces the bias magnet 8 and the reed switch 7 turns OFF.
It is stored as a state.

In the above explanation, the detected magnet 3, 4, 5 or 3,
4 was fixed on the rotating body 2, a detection storage unit 6 consisting of a reed switch 7 and a bias magnet 8 was fixed on the rotating body 2, and the detection magnet 3,
4, 5 or 3, 4 may be fixedly arranged. In this embodiment, the N-S direction of the detection target magnets 3 and 4, the bias magnet 8, and the arrangement direction of the reed switch 7 are set as the rotational direction of the rotating body 2. It may be in the direction of the rotation axis (direction perpendicular to the plane of the drawing).

FIG. 6 shows another embodiment in which the rotating body 2 is a movable body 9 that moves linearly left and right. In the figure, magnets 3, 4, and 5 for detection are fixed to the movable body 9, and On the other hand, a reed switch 7 of the detection storage section 6 and a bias magnet 8 are arranged.

The arrangement of the detection target magnets 3, 4, 5 and the detection storage section 6 is such that the reed switch and the detection storage section of the bias magnet are fixedly arranged on one of the moving object and the immovable object, and the detection object magnet is fixedly arranged on the other. It's okay. With this configuration, the moving body 9 only needs to be long enough for the detected magnet to pass through the area of the detection storage section consisting of the reed switch and the bias magnet, so a long discrimination dog is used as in the conventional case. There's no need.

〔Effect of the invention〕

Since the present invention is configured as described above, it is possible to reliably determine and store the passing direction, that is, the direction of rotation or movement, with a simple configuration. Therefore, it is possible to prevent troubles such as entanglement and disconnection when there are wiring or piping on or around the rotation axis, so it is suitable for use, for example, in detecting the rotation direction and position of the tip head shaft of a robot. It is possible to provide a passing direction memory switch which has excellent effects such as eliminating the need for returning the rotating body due to a mistake.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a passing direction memory switch, and FIG. 2 is an explanatory diagram of the operation of the passing direction memory switch for passing in a counterclockwise direction.
Fig. 3 is an explanatory diagram of the operation of a passage direction memory switch that passes in a clockwise direction, Fig. 4 is an illustration of the operation of a passage direction memory switch that passes in a counterclockwise direction in another embodiment, and Fig. 5 is an explanatory diagram of the operation of a passage direction memory switch that passes in a counterclockwise direction. An explanatory diagram of the operation of the passing direction memory switch, FIG. 6 is a plan view of another embodiment in which the passing direction memory switch is implemented on a moving body moving in a linear direction, and FIG. 7 is a conventional rotating shaft rotation area discrimination device. FIG. 2... Rotating body, 3, 4, 5... Magnet for detection,
6...Detection storage section, 7...Reed switch, 8...
...Bias magnet, 9...Moving object.

Claims (1)

[Claims] 1 Consists of a reed switch, a detection storage unit consisting of a bias magnet, and a detected magnet, the bias magnet is placed in a position where the state of the reed switch can be maintained, the detected magnet has the same polarity as the bias magnet, A passing direction memory switch in which the detection memory section and the detected magnet are arranged with opposite polarity, one of which is provided on a rotating or moving object, and the other is provided on an immovable object.