JPH11306907A - Limit position detector and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong a life of a limit position detecting switch and to lower current consumption by performing control so that a moving object is returnes to the position, in which a movable part is not pressed, when the movable part of the limit position detecting switch is pressed by the moving object. SOLUTION: A movement control means 4 gives a moving means 2 an instruction for moving a moved object 3 in the movement direction A until it reaches a movement limit position X1. The movement control means 4 gives the moving means 2 an instruction for moving the moved object 3 in the movement direction B when the moved object 3 pressed a movable part 1a so as to reach the movement limit position X1 and a limit position detecting switch 1 is turned on. The movement control means 4 gives a movement stopping instruction when the moved object 3 is returned to a position X2, in which it does not press the movable part 2a, and the limit position detecting switch 1 is turned off. The limit position switch 1 is turned on for only a few time when the moved object 3 reaches the movement limit position X1 and does not continue acting for a long term, so that applied stress can be lowered. This mechanism is used for a moving mechanism unit returning a massaging arm to a reference position in an electric massage chair.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of a limit position detecting device and a limit position detecting device.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional limit position detecting device includes a moving means 2 for moving an object 3 and a limit position for detecting that the object 3 has reached a movement limit position X1. And a detection switch 1. In this limit position detecting device, the limit position detection switch 1 detects that the moving object 3 has reached the movement limit position X1, and stops the moving object 3 at the movement limit position X1.

As the limit position detection switch 1, there is, for example, a momentary push-on switch.
As shown in FIG. 3, the limit position detection switch 1 has a contact point P when the movable portion 1a of the switch is pressed.
1 and the contact P2 are turned on, and the movable portion 1a
Is not pressed, the contact P1 and the contact P2 are in an OFF state in which the contact is not conducted. This limit position detection switch 1 is arranged near the movement limit position X1.

The limit position detecting device is widely used in various kinds of equipment, and is used, for example, in a moving mechanism for returning an abrading arm of an electric abrasion chair to a movement limit position X1 as a reference position.

The operation of returning the grooming arm to the movement limit position X1 in response to the operation end request in the limit position detecting device used in the moving mechanism of the electric masque chair will be described with reference to FIG.

During the massaging operation of the electric massaging chair, the moving object 3
The reciprocating motion is repeated within an arbitrarily set movement range along the movement direction while performing an operation such as fir or tataki. The current position of the rubbing arm is known by counting (adding / subtracting) the pulses generated by the movement of the rubbing arm, and the number of pulses repeats a reciprocating motion. In some cases, errors may occur due to count omission or the like. Therefore, in order to prevent the accumulated error, as shown in FIG. 4 (a), every time there is an operation end request, the rubbing arm is moved to the movement limit position X1, and the rubbing arm is moved to the limit position detection switch 1. Of the movable part 1a of the
When it becomes N, based on the detection signal from the limit position detection switch 1, as shown in FIG. 4B, the arm for rubbing is stopped at the movement limit position X1. The number of pulses is cleared to 0 using the movement limit position X1 as a reference position.

In the state where the rubbing arm is stopped at the movement limit position X1, as shown in FIG. 4B, the movable portion 1a of the limit position detecting switch 1 is kept pressed by the rubbing arm. The limit position detection switch 1 is kept ON.

[0008]

However, in the conventional limit position detecting device, when the moving object 3 reaches the movement limit position X1 as shown in FIG. 4B, the moving object 3 moves as shown in FIG. The movable portion 1a of the limit position detection switch 1 is pressed in the direction of arrow A by the object 3, and the switch is turned ON.
When the switch is ON, the movable portion 1a is turned OFF.
There is a load on the rubber and springs that are trying to return to the direction of.

In the case where the moving object 3 is stopped at the movement limit position X1 and left for a long time with the switch ON, as in the case of the above-described electric massage chair, a load is applied to the limit position detection switch 1. This has been a factor of switch deterioration because the light is still applied. In addition, switch O
In the state of N, a current of several tens μA to several mA was still flowing through the resistor R. For example, as shown in FIG. 3, if Vdd = 5 V and R = 10 KΩ, the switch O
In the state of N, a current of 0.5 mA continued to flow through the resistor R.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control method of a limit position detecting device and a limit position detecting device which achieve a longer life and lower current consumption of the limit position detecting switch.

[0011]

According to the control method of the limit position detecting device of the present invention, when the limit position detecting switch detects that the moving object has reached the movement limit position, the movable portion of the limit position detecting switch is used. Is controlled to return the moving object to a position where the movable portion is not pressed when the moving object is pressed by the moving object.

According to the present invention, it is possible to obtain a control method of a limit position detecting device and a limit position detecting device which achieve a longer life and lower current consumption of the limit position detecting switch.

[0013]

According to the first aspect of the present invention, when the limit position detection switch detects that the moving object has reached the movement limit position, the movable portion of the limit position detection switch is moved. This is a control method of a limit position detecting device that controls the movable portion to return to a position where the movable portion is not pressed when pressed by a moving object. Can be achieved.

According to a second aspect of the present invention, when the moving object is detected to have reached the movement limit position by the limit position detecting switch and the moving object is stopped, the limit position detecting switch is used. When the movable part is pressed by the moving object, the method is a control method of a limit position detecting device that controls the movable object to return to a position where the movable part is not pressed and to stop the moving object. Long life and low current consumption can be achieved.

According to a third aspect of the present invention, there is provided a limit position detecting device for detecting that the moving object has reached a movement limit position by pressing the movable portion of the limit position detecting switch. Wherein the limit position detection device is provided with a movement control means for returning the moving object to a position where the movable portion is not pressed when the movable portion of the limit position detection switch is pressed by the moving object. It is possible to extend the life of the detection switch and reduce the current consumption.

According to a fourth aspect of the present invention, there is provided a limit position detecting device for detecting that a moving object has reached a movement limit position by pressing the movable portion of the limit position detecting switch. In the limit position detecting device, the movable position of the limit position detecting switch is provided with movement control means for returning the moving object to a position where the movable portion is not pressed when the movable portion is pressed by the moving object and stopping the moving portion. In addition, it is possible to extend the life of the limit position detection switch and reduce the current consumption.

Hereinafter, a control method of a limit position detecting device and a limit position detecting device according to the present invention will be described based on specific embodiments. (Embodiment) As shown in FIG. 1, a limit position detecting device according to the present embodiment includes a limit position detecting switch 1 and a moving means 2.
In addition to the above, when the movable portion 1a of the limit position detection switch 1 is pressed by the moving object 3, the moving control means 4 controls the moving object 3 to return to the position X2 where the movable portion 1a is not pressed and stop. Is provided.

The limit position detection switch 1 includes, for example, a momentary push-on switch which is turned on when the movable portion 1a of the switch is pressed and turned off when the movable portion 1a is not pressed. This limit position detection switch 1 is arranged near the movement limit position X1.

The movement control means 4 is constituted by a microcomputer for controlling the movement means 2 in accordance with the flowchart shown in FIG. Here, as a specific example, for a limit position detecting device used in a moving mechanism unit that returns a massaging arm as a moving object 3 of an electric massaging chair to a reference position, the moving object is determined based on an operation end request. The operation of moving the arm for rubbing as No. 3 to the movement limit position X1 as a reference position and detecting that the arm reaches the movement limit position X1 will be described.

When an operation end request is received during the massaging operation of the electric massaging chair, as shown in FIG. 2, in step S1 of the movement control means 4, it is determined that there is a movement request to the movement limit position X1, and the movement control means In step S2 of FIG.
As shown in (a), the rubbing arm is moved to the movement limit position X1.
Moving means 2 so as to move in the moving direction A so as to reach
To instruct.

In step S3 of the movement control means 4, it is determined whether or not the limit position detection switch 1 is ON.
Here, as shown in FIG. 1 (b), when the abrasion arm presses the movable portion 1a of the limit position detection switch 1 and reaches the movement limit position X1, the limit position detection switch 1 is turned on.
When N is reached, in step S4 of the movement control means 4, the movement means 2 is instructed to move the rubbing arm in the movement direction B in which the movement direction A of the rubbing arm is reversed.

In step S5 of the movement control means 4, it is determined whether or not the limit position detection switch 1 has been turned off. Here, as shown in FIG. 1C, when the abrasion arm is returned to the position X2 at which the movable portion 1a of the limit position detection switch 1 is not pressed, and the limit position detection switch 1 is turned off, the movement control means 4 In step S4, the moving means 2
To stop moving. The rubbing arm stops at the position X2 where the movable portion 1a of the limit position detection switch 1 is not pressed. With this position X2 as a reference position, the number of pulses is cleared to zero.

With this configuration, the limit position detection switch 1 is ON only for a very short period of time when the rubbing arm has reached the movement limit position X1, and can be turned OFF during other periods. Since the movable portion 1a of the limit position detection switch 1 is not continuously pressed by the rubbing arm as in the related art, the ON state of the limit position detection switch 1 does not continue for a long time. 1 can be reduced, and the life of the limit position detection switch 1 can be extended.

Further, the limit position detecting switch 1 is turned off.
If the current consumption is larger when the switch is ON than when the switch is ON or when the current flows when the limit position detection switch 1 is ON, the movable portion 1a is returned to the position X2 where it is not pressed, and the limit position detection switch 1 is turned OFF. Therefore, it is possible to prevent a current of several tens of μA to several mA from flowing through the resistor R while the limit position detection switch 1 is in the ON state, and to reduce current consumption.

Specifically, in the case of the limit position detection switch 1 as shown in FIG. 3, Vdd = 5 (v) and R = 10
(KΩ), the period during which the 0.5 mA current flowing through the resistor R flows when the limit position detection switch 1 is in the ON state can be made very short.

Although the moving means is provided outside the moving object in this embodiment, the same effect can be obtained even when the moving means is incorporated in the moving object. In this embodiment, the case where the limit position detecting device is used for the moving mechanism of the electric masquerade chair is described. However, the present invention is not limited to the movement mechanism of the electric masquerade chair. The same effect is obtained even when the position detecting device is used.

In the embodiment, the moving object is returned to a position where the movable portion of the limit position detection switch is not pressed and stopped, but the movable object is moved at least to a position where the movable portion of the limit position detection switch is not pressed. It is needless to say that, by returning the position, the life of the limit position detection switch can be extended and the current consumption can be reduced.

[0028]

According to the control method of the limit position detecting device of the present invention, when the limit position detecting switch detects that the moving object has reached the movement limit position, the movable portion of the limit position detecting switch is moved. By controlling the movable object to return to a position where the movable portion is not pressed when pressed by a moving object, the state where the limit position detection switch is ON is extremely small when the moving object reaches the limit position. And OFF in other states. Therefore, the movable portion of the switch is continuously pressed by the moving object at the movement limit position of the moving object, and the moving object is not stopped for a long time with the limit position detection switch being ON. The load that the part is pressed can be reduced,
The life of the limit position detection switch can be extended.

Further, when the current consumption is larger when the limit position detection switch is ON than when the limit position detection switch is OFF or when the current flows when the limit position detection switch is ON, the current consumption can be reduced. Specifically, in the case of the limit position detection switch as shown in FIG. 3, for example, Vdd = 5v,
If R = 10 KΩ, the period during which the current of 0.5 mA flows through the resistor R when the switch is ON can be minimized.

Further, according to the limit position detecting device of the present invention, when the movable portion of the limit position detecting switch is pressed by the moving object, the moving control means for returning the moving object to a position where the movable portion is not pressed is provided. With the provision, the control method of the limit position detecting device of the present invention can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a limit position detecting device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the movement control means of the embodiment.

FIG. 3 is a block diagram showing a configuration of a limit position detection switch according to the embodiment;

FIG. 4 is a block diagram showing a configuration of a conventional limit position detecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Limit position detection switch 2 Moving means 3 Moving object 4 Movement control means

Claims (4)

[Claims] When a movable portion of a limit position detecting switch is pressed by a moving object when detecting that a moving object has reached a movement limit position by a limit position detecting switch, the movable portion is not pressed. A method of controlling a limit position detecting device for controlling the moving object to return to the moving object. 2. A moving part of the limit position detecting switch is pressed by the moving object when the moving object is stopped by detecting that the moving object has reached the movement limit position by the limit position detecting switch. And a control method of the limit position detecting device for controlling the moving object to return to a position where the movable portion is not pressed and stop the moving object. 3. A limit position detection device for detecting that a moving object has reached a movement limit position by pressing a movable portion of the limit position detection switch. A limit position detecting device provided with a movement control means for returning the moving object to a position where the movable portion is not pressed when pressed by the moving object. 4. A limit position detecting device for detecting that a moving object has reached a movement limit position by pressing the moving portion of the limit position detection switch, wherein the movable portion of the limit position detection switch is A limit position detecting device provided with movement control means for returning the moving object to a position where the movable portion is not pressed when the moving object is pressed by the moving object.