JPS589568B2 - Kahentei Kokensa Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for testing the performance of a variable resistor, particularly for testing rotational torque or moving operating force.

Some variable resistors do not allow smooth rotation of the shaft or movement of the operating lever due to the method of assembly or the precision of each component.

It is difficult to use such a variable resistor that does not operate smoothly, and the rotating torque or moving operation force must be measured and inspected to classify good products and defective products.

Conventionally, testing of circuit torque or moving operation force was carried out manually by moving a practice means and classifying good and bad variable resistors to be tested based on the feeling transmitted to the hand. Accurate measurements were impossible because force could not be applied uniformly over the entire area.

Another method is to read it with a torque meter or pressure gauge and determine whether it is within a predetermined value, but it takes time to inspect the measurement, and errors may occur depending on the way the torque make or pressure gauge is installed. It was not possible to classify good products and defective products.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a variable resistance testing device that can easily and accurately test rotational torque or moving operating force by using an electronic circuit.

According to the present invention, in a variable resistor testing device having a slider, there is provided a prescribed force generating section that applies a constant force to the operating means of the variable resistor to be tested, and a voltage that maintains a voltage corresponding to the total resistance value. a storage section, a lower limit generation section that divides the output of the voltage storage section, a comparison section that compares a voltage proportional to the position of the slider with the output of the lower limit generation section, and an inverter that inverts the comparison section and the output signal. A variable resistance testing device is obtained, which includes a signal storage section that uses the output of the inverter section as a set signal and the output of the comparison section as a reset signal.

The present invention will be described in detail below with reference to the drawings.

The figure is a configuration diagram showing one embodiment of the present invention, in which 1 is an upper terminal a;
A variable resistor to be tested has a sliding terminal b, a lower terminal c, an operating means d consisting of a shaft or an operating lever, and a slider e, and a constant current power source 2 is connected in parallel with terminals a and c.

4 is a prescribed force generating section that generates a predetermined constant force to be applied to the operating means d, and the generated output is applied to the operating means d.
It is connected to the drive unit 3 that transmits the information to the driver.

The voltage memory 5 is connected so that a voltage corresponding to the total resistance value generated between the terminals a and c of the variable resistor 1 to be tested is held by the set signal of the voltage memory controller 6 or discharged by the reset signal. The output of 5 is connected to the input of a lower limit generator 7 which divides the voltage held in the voltage storage 5 and generates a limit value in a predetermined region around zero.

The comparison section 8 uses the output of the lower limit generation section 7 as one input, and compares the voltage generated between the terminals b and c of the variable resistor 1 to be tested, which is proportional to the position of the slider e, as another input. A signal storage section 10 is connected to the input of an inverter section 9 that inverts the compared output signal, and is connected so that the output of the inverter section 9 is used as a set signal and the output of the comparison section 8 is used as a reset signal.

Next, the operation will be explained with reference to the drawings.

First, the slider e of the variable resistor 1 to be tested is placed on the terminal a side, and the output of the voltage storage section 5 is brought to zero voltage by a reset signal from the voltage storage control section 6.

Further, the output of the specified force generating section 4 is set to the reference value.

As a first step, a set signal from the voltage storage control section 6 causes the voltage storage section 5 to hold a voltage corresponding to the total resistance value generated between the terminals a and c of the variable resistor 1 to be tested.

As a second step, a force is applied to the operating means d to move the slider e from the position of the terminal a toward the terminal C.

In the second step, if the rotational torque or moving operating force of the variable resistor 1 to be tested is greater than the force applied to the operating means d obtained from the prescribed force generating section 4, the slider e does not move and remains on the terminal a side. ing.

Therefore, the voltage proportional to the position of the slider e generated between terminals b and c is higher than the output voltage of the lower limit generator 7, and no voltage is generated at the output of the comparator 8, so the output of the comparator 8 is the inverter. 9 becomes the set signal of the signal storage section 10, and the signal is stored.

When the recirculating torque or moving operating force of the variable resistor 1 to be tested is smaller than the force exerted on the operating means d, the slider e begins to move toward the terminal C.

When the slider e is at the terminal a example, the voltage between the terminals b and c is higher than the output voltage of the lower limit generating section 7, so the signal is stored in the signal storage section 10.

Further, when slider e moves close to terminal C, the voltage between terminals b and c becomes lower than the output voltage of lower limit generator 7, and comparator 8
Since a voltage is generated at the output of the comparator 8, the output of the comparison section 8 becomes a reset signal for the signal storage section 10, and the signal stored in the signal storage section is reset.

Therefore, after the completion of the second step, if a signal is generated at the output of the signal storage section 10, the rotational torque or moving operation force of the variable resistor 1 to be tested is greater than the specified value, and if no signal is generated, the rotational torque Alternatively, it is found that the moving operation force is smaller than the specified value, and it is possible to determine whether the variable resistor 1 to be inspected is good or defective.

In the above, the test when moving the slider e from the terminal a to the terminal C has been explained, but the test when moving the slider e from the terminal C toward the terminal a is stored in the voltage storage section 5. An upper limit generation section, a comparison section, an inverting section, and a signal storage section are provided to divide the voltage and generate a limit value in the vicinity of the voltage corresponding to the total resistance value, and the logical sum of the output signals generated from the two signal storage sections is provided. It can be easily inferred that it is possible to inspect the slider e when it is moving back and forth.

As explained above, according to the present invention, since it is composed of a prescribed force generation section, a comparison section 8, a signal storage section, etc., it is not necessary to measure the rotational torque or moving operation force of the variable resistor to be tested with a meter or the like. In addition to easily distinguishing between good and defective products, by always moving the operating means with a constant force, you can accurately distinguish between good and defective products.
Defective products can be determined, and at the same time, automation can be easily achieved by making the output of the signal storage part a logic signal.

Furthermore, by forming two sets of the upper limit generating section, the lower limit generating section, the comparison section, the inverter section, and the signal storage section, many effects such as the ability to inspect the rotational torque or moving operation force during reciprocating of the slider can be achieved. .

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the present invention, in which 1 is a variable resistor to be tested, 2 is a constant current power supply section, 3 is a drive section, 4 is a specified force generation section, 5 is a voltage storage section, and 6 is a voltage A storage control section, 7 a lower limit generation section, 8 a comparison section, 9 an inverter, and 10 a signal storage section.

Claims (1)

[Claims] 1. An inspection device for a variable resistor having a slider, which includes a prescribed force generation section that applies a constant force to the operating means of the variable resistor to be inspected, a voltage storage section that holds a voltage corresponding to the total resistance value, and a voltage storage section that holds a voltage corresponding to the total resistance value. a lower limit generating section that divides the output of the voltage storage section and generates a limit value near zero; a comparing section that compares a voltage proportional to the position of the slider with the output of the lower limit generating section; and an output signal of the comparing section. What is claimed is: 1. A variable resistance testing device comprising: an inverter section that inverts the output of the inverter section; and a signal storage section that uses the output of the inverter section as a set signal and the output of the comparison section as a reset signal.