JPH0624751Y2 - Transducer using strain resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a transducer that utilizes strain resistance to obtain the direction and magnitude of a given force.

(Prior Art) In various industrial machines, it is often desired to perform a planar operation, that is, a two-dimensional operation. This two-dimensional operation is 1
Conventionally, the potentiometer 2 has been used as means for obtaining the magnitude and direction of the force when operated with two handles.
It was obtained by combining a gimbal mechanism, a bearing mechanism, and a gear mechanism with a mechanical structure.

(Problems to be Solved by the Invention) Conventionally, the mechanical structure has a drawback that the structure is complicated and cannot be downsized.

The present invention aims to solve the above drawbacks,
It is an object of the present invention to provide a transducer using a strain resistance which can be reduced in size and weight by using a strain resistance element whose resistance changes in proportion to the amount of deformation.

(Means for Solving the Problems) Therefore, the transducer using strain resistance of the present invention includes a shaft, first and second fixing members for fixing both ends of the shaft, and a first member and a second member which are parallel to the shaft. Between the first and second fixing members, there are provided two plates respectively arranged in the X-axis and Y-axis directions forming a right angle, and strain resistance elements attached to both surfaces of each of the two plates, One end of each of the two plates is fixed to the first fixing member, and the other end of the plate arranged in the X-axis direction and the other end of the plate arranged in the Y-axis direction are formed into the second plate. It is characterized in that the plate is fitted in a groove formed in the fixing member and movable in the X-axis direction and a groove movable in the Y-axis direction.

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment) FIG. 1 is a vertical cross-sectional view of a transducer using a strain resistance according to the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is a strain attached to a plate. FIG. 4 is a strain generation explanatory view for explaining that strain is generated in the resistance element, FIG. 4 is a configuration of an embodiment of a transducer drive circuit using the strain resistance according to the present invention, and FIG. 5 is an output of FIG. FIG. 6 is a longitudinal sectional view of a structure of an embodiment of a transducer using strain resistance according to the present invention.

In FIG. 1 and FIG. 2, both ends of the shaft 1 are fixed to a first fixing member 2 and a second fixing member 3, respectively. Between the first fixing member 2 and the second fixing member 3, as shown in FIG. 2, parallel to the X axis and the Y axis, respectively,
Further, two plates 4 and 5 which are perpendicular to each other and are parallel to the shaft 1 are provided as shown in FIG. One ends of the plates 4 and 5 are fixed to the first fixing member 2, and the other ends of the plates 4 and 5 are parallel to the X axis and the Y axis provided on the second fixing member 3. It is fitted in the grooves 6 and 7, respectively, and is attached so as to be movable in the X-axis direction and the Y-axis direction, respectively. The grooves 6 and 7 provided in the second fixing member 3 into which one ends of the plates 4 and 5 are fitted are
It is drilled as follows. That is, in FIG. 2, the groove 6 is formed in the thickness of the plate 4 in parallel with the X axis, and the groove width thereof is slightly wider than the width of the plate 4. The groove 7 is formed in the thickness of the plate 5 in parallel with the Y axis, and the groove width thereof is slightly wider than the width of the plate 5. Therefore, the plate 4 has the groove 6
Can move in the longitudinal direction of the groove 7, that is, in the X-axis direction, but cannot independently move in the Y-axis direction. Similarly, the plate 5 moves in the longitudinal direction of the groove 7, that is, the Y-axis direction. However, the structure is such that it cannot move independently in the X-axis direction.

Strain resistance elements 8 and 9 are attached to both surfaces of the plate 4, and strain resistance elements 10 and 11 are attached to both surfaces of the plate 5.

Now, for example, when the first fixing member 2 is fixed and the force F is applied to the second fixing member 3 as shown in FIG.
The shaft 1 is deformed as shown in FIG. The force F is
In general, it can be decomposed into an X-axis component F _X and a Y-axis component F _Y. Since the groove 6 is formed so that the plate 4 can move in the X-axis direction, even if the X-axis component F _X of the force F exists, the plate 4 is returned to the original position in the X-axis direction.
Exists, and distortion of the plate 4 in the X-axis direction does not occur,
The Y-axis component F _Y of the force F causes distortion of the plate 4 in the Y-axis direction. Therefore, the strain resistances of the strain resistance elements 8 and 9 attached to the plate 4 change in proportion to the Y-axis component F _Y. Similarly, since the groove 5 is formed so that the plate 5 can move in the Y-axis direction, even if the Y-axis component F _Y of the force F exists, the plate 5 is returned to the original position in the Y-axis direction. 5 is present and no distortion of the plate 5 in the Y-axis direction occurs, but the X-axis component F _X of the force F causes the plate 5
Distortion occurs in the X-axis direction. Therefore, the strain resistance of the strain resistance elements 10 and 11 attached to the plate 5 changes in proportion to the X axis component F _X.

The applied force F can be detected from the circuit of FIG. 4 by the change of the strain resistance value of these strain resistance elements 8 to 11. That is, in FIG. 4, reference numerals 8 to 11 correspond to those of FIGS. 1 to 3, 12 is a power source, and 13 to 15 are terminals.

When the force is not applied to the second fixing member 3 and therefore the strain resistance elements 8 to 11 are not distorted, the resistance values of the strain resistance elements 10 and 11 are selected to be equal. , The voltage V _X generated between terminals 13 and 14 is zero. Similarly, strain resistance elements 8 and 9 are selected to have the same resistance value.
The voltage V _Y generated between V and 5 is zero.

As described above, when the force F is applied to the second fixing member 3, the strain resistance elements 8 to 11 are strained according to the direction and magnitude of the applied force F, and their resistance values are changed. . Therefore, as shown in FIG. 5, an output voltage V _X is generated between the terminals 13 and 14 according to the X-axis component and the Y-axis component of the applied force F, and the output voltage V _X is output between the terminals 13 and 15. The voltage V _Y is generated. The magnitude and direction of the applied force F can be obtained by synthesizing the output voltages V _X and V _{Y in} vector using a known circuit.

In the above description, the magnitude of the force F that can be applied to the second fixing member 3 is limited within the elastic proportional limit in which the shaft 1 returns to its original state. Further, since the force F is proportional to the displacement within the elastic proportional limit, the force F can be replaced with the displacement.

FIG. 6 is a vertical sectional view showing the structure of an embodiment of a transducer using strain resistance according to the present invention.

A cavity 17 is formed inside the housing 16, and the cavity 1
A screw portion 18 is provided at the lower end portion of 7. The screw part 1
The shaft 1 is fixed to the central portion of an end cap 19 which is screwed with the shaft 8, and the plates 4 and 5 are fixed to the end cap 19 at right angles to each other. The upper end of the shaft 1 is fixed to the stick 20, and the upper end of the stick 20 has a structure protruding from the housing 16. Since the lower end of the stick 20 locks the other ends of the plates 4 and 5, the grooves 6 and 7 (6 is not shown in FIG. 6) described in FIG. 2 are formed. The plates 4 and 5 are fitted in the grooves 6 and 7. Strain resistance elements 8 (8 is not shown in FIG. 6), 9, 10 and 11 are provided on both sides of these plates 4 and 5.
And are pasted. Strain resistance element 8 to 11
Lead wires 21 are drawn out from the respective ends of the lead wire 21. These lead wires 21 are connected to a terminal 23 attached to the end cap 19 through an insulating tube 22 or taken out to the outside through a hole 24. There is.

The upper end of the stick 20 projects from a hole 25 of the housing 16 that is bored larger than the diameter of the stick 20, and a knob 26 is attached to the tip of the hole 25 with a screw or the like. A packing 27 is provided between the knob 26 and the housing 16.
Is provided to prevent dust and the like from entering the cavity 17 of the housing 16. The housing 16 is fixed to the mounting plate 30 with washers 28 and nuts 29. Therefore, when force is applied to the knob 26, the shaft 1 is bent with respect to the mounting plate 30, that is, the end cap 19 serving as a fixed end as described above, and the strain resistance elements 8 to 11 attached to the plates 4 and 5 respectively. Distortion occurs.

By configuring the circuit shown in FIG. 4 with the terminals 23 shown and the terminals not shown and the lead wires 24, output voltages V _X and V _Y corresponding to the force F applied to the knob 26 are obtained. To be The magnitude and direction of the force F applied to the knob 26 can be obtained from the output voltages V _X and V _Y , as described above with reference to FIGS. 1 to 5.

(Effects of the Invention) As described above, according to the present invention, it is possible to obtain a highly accurate transducer with a simple structure, and also to reduce the size. It is also possible to measure the amount of displacement of the knob instead of the force applied to the knob.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a transducer using strain resistance according to the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is a strain resistance element attached to a plate. 4 is a diagram for explaining the occurrence of distortion, FIG. 4 is a diagram showing an embodiment of a drive circuit for a transducer using a strain resistance according to the present invention, and FIG. 5 is an output characteristic diagram of FIG. FIG. 6 is a longitudinal sectional view showing the structure of an embodiment of a transducer using strain resistance according to the present invention. In the figure, 1 is a shaft, 2 is a first fixing member, 3 is a second fixing member, 4, 5 are plates, 6, 7 are grooves, and 8 to 1
Reference numeral 1 is a strain resistance element, 16 is a housing, 19 is an end cap, 20 is a stick, 26 is a knob, 27 is a packing, 28 is a washer, 29 is a nut, and 30 is a mounting plate.

Claims (1)

[Scope of utility model registration request] 1. A shaft, first and second fixing members for fixing both ends of the shaft, respectively, and an X axis, Y which is parallel to the shaft and is perpendicular to the first and second fixing members. It is provided with two plates respectively arranged in the axial direction, and strain resistance elements attached to both surfaces of each of the two plates. One end of each of the two plates is fixed to the first fixing member. At the same time, the other end of the plate arranged in the X-axis direction and the other end of the plate arranged in the Y-axis direction are movable in the X-axis direction formed in the second fixing member. A transducer using strain resistance, characterized in that the plate is fitted in each of the groove and the groove movable in the Y-axis direction.