JPS5957128A - Dynamometer - Google Patents

Abstract

PURPOSE:To facilitate handling and to enhance measuring preciseness, by mounting a magnetic scale provided in parallel relation to the deformation direction of an elastic member and an elastically deformable sensor comprising a magnetic head capable of detecting the graduation of the magnetic scale. CONSTITUTION:A force meter 1 has a magnetic scale 6a attached to the upper part (base part) of an elastic member 3, a magnetic scale 6b attached to the lower part (leading end part) of the elastic member 3 and a magnetic head 7a provided to the upper part of a holder 5 at a position opposed to the magnetic scale 6a. In addition, a pair of the magnetic scale 6a and the magnetic head 7a and a pair of a magnetic sclae 6b and a magnetic head 7b respectively constitute deformation sensors. By this constitution, because only a deformation amount of a part from the magnetic scale 6a of the elastic member 3 to the magnetic scale 6b is measured, handling becomes easy and the enhancement of measuring preciseness is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a force meter, and particularly to a force meter that measures force using elastic deformation of an object.

Dynamometers are known that determine the magnitude of a force by applying a force to be measured to an elastic member and measuring its elastic deformation.

However, among the conventionally known force meters, those that use a helical spring or the like as an elastic member have low measurement accuracy, and those that use a highly rigid elastic member have a dial gauge to measure the amount of elastic deformation. Since the method uses a measuring device such as an ozotic lever, it has a complicated structure and is difficult to handle.

The present invention has been made based on the above-mentioned viewpoints, and it is an object of the present invention to provide a force meter that has a simple structure, is easy to handle, has high measurement accuracy, is robust as a whole, and is resistant to shocks and temperature changes. purpose.

Therefore, the gist of the present invention is to apply a force whose magnitude is to be measured to an elastic member, measure its elastic deformation, and use a dynamometer to determine the magnitude of the force. A magnetic scale is installed parallel to the deformation direction of the elastic member, and the magnitude of the force is determined by detecting the movement of the scale of the magnetic scale with a magnetic head and measuring the amount of elastic deformation. It's about knowing.

The details of the configuration of the present invention will be explained below based on the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the force meter according to the present invention,
FIG. 2 is an explanatory diagram showing another embodiment of the present invention, FIG. 3 is an explanatory diagram showing still another embodiment of the present invention, and FIG. 4 is an embodiment of the present invention in which the elastic member is a loop. FIG.

In each figure, the same reference numerals indicate components having the same function.

In Figure 1, 1 is a dynamometer, 2 is a hanging bracket, 3 is an elastic member, and 4
The hook is a metal fitting, 5 is a holder that is installed parallel to the elastic member 3 and no force to be measured acts on it, 6 is a magnetic scale attached to the lower part of the elastic member 3, and 7 is opposite to the magnetic scale 6 at the lower part of the holder 5. 8 is an object with a load to be measured; 9 is an arithmetic circuit that decodes the scale of the magnetic scale detected by the magnetic head; 10 is a signal from the arithmetic circuit 9 that converts it into the amount of force or weight. This is a display that displays the Further, the magnetic scale 6 and the magnetic head 7 constitute a pair of elastic deformation sensors.

The force meter 1 is suspended by a hanging fitting 2, and an object 8 carrying a load to be measured is suspended from the hanging fitting 4.

The holder 5 is provided parallel to the elastic member 3, and - The upper end is fixed to the upper part of the force meter 1, but the lower end is not fixed and therefore no force to be measured acts on it.

The magnetic head 'l is provided at the bottom of the holder 5 at a position facing the magnetic scale 6 so that the scale of the magnetic scale 6 can be detected, and whether the tip of the head 'l lightly touches the scale of the magnetic scale 6 or not.1. They are configured to be close to each other at a predetermined minute interval.

When the object 8 is suspended from the metal fitting 4, the elastic member 3 causes elastic deformation, and the magnetic scale 6 attached to the bottom of the elastic member 3 moves downward in the figure, but the force to be measured does not act on the holder 5. Since the magnetic head 7 attached to the magnetic head 7 remains stationary, the amount of elastic deformation of the elastic member 3 can be determined by detecting the movement of the scale of the magnetic scale 6 using the magnetic head 7.

The scale of the magnetic scale 6 detected by the magnetic head 7 is decoded by the arithmetic circuit 9, and the signal is converted by the display 10 and displayed as the magnitude of force or weight.

Although the elastic member 3 is shown as a rigid rod-shaped body in FIG. 1, it may also be a wire-shaped body or a band-shaped body with a diameter of 1111φ or less, or it may be attached to the end of such a wire. A membrane portion may be provided so that new elastic members can be replaced one after another, or the whole may be used as a horizontal ring in any position.

FIG. 2 is an explanatory diagram showing an embodiment of a force meter provided with two elastic deformation sensors.

In FIG. 2, 6a is a magnetic scale attached to the upper part (base) of the elastic member 3, 6b is a magnetic scale attached to the lower part (tip) of the elastic member 3, and 7a is attached to the upper part of the holder 5, facing the magnetic scale 6a. The magnetic head 7b is provided at the bottom of the holder 5 at a position facing the magnetic scale 6b, and the magnetic scale 6a and the magnetic head 7a, and the magnetic scale 6b and the magnetic head 7b are each paired as a pair. It constitutes an elastic deformation sensor.

The magnetic heads 7a and 7b are provided at the upper and lower parts of the holder 5 at positions facing the magnetic scales 6a and 6b so that the scales of the magnetic scales 6a and 6b can be detected, and their tips lightly touch the scales of the magnetic scales 6a and 6b. Or,
They are configured to be close to each other at a predetermined minute interval.

When the object 8 is suspended from the bracket 4, the elastic member 3 undergoes elastic deformation, and the magnetic scales 6b and 6b attached to the upper and lower parts of the elastic member 3 move downward in the figure, but the force to be measured is Magnetic head 7 placed in holder 5 which does not work
Since a and 7b remain stationary, are they magnetic heads? a, 7
b allows the movement of the scales of the magnetic scales 6a, 6b to be detected.

Magnetic scale 6a detected by magnetic heads 7a and 7b.

The scale 6b is decoded by the arithmetic circuit 9, and if the difference between the moved scale of the magnetic scale 6b and the moved scale of the magnetic scale 6a is taken, the elastic deformation of the portion of the elastic member 3 from the magnetic scale 6a to the magnetic scale 6b is determined. You can know the amount.

The signal from the arithmetic circuit 9 is converted by the display 10,
It is expressed as the magnitude of force or weight.

According to the above embodiment, only the amount of deformation of the portion of the elastic member 3 from the magnetic scale 6a to the magnetic scale 6b is measured, so that the influence of the infrared portion of the elastic member 30 is removed, and more accurate measurement can be expected.

FIG. 3 is an explanatory view showing an embodiment of Dialect F in which the magnetic scale is provided on a holder parallel to the elastic member and no force to be measured acts, and the magnetic head is provided on the elastic member.

In FIG. 3, 6 is a magnetic scale attached to the lower part of the holder 5, and 7 is a magnetic head provided at the lower part of the elastic member 3 at a position facing the magnetic scale 6. A pair of both 7 constitute an elastic deformation sensor.

The magnetic head 7 is provided at the lower part of the elastic member 3 at a position facing the m%-z scale 6 so that the scale of the magnetic scale 6 can be detected, and its tip touches the scale of the magnetic scale 6 lightly or at a predetermined minute interval. Configure in close proximity.

When an object 8 is suspended from the metal fitting 4, the elastic member 3 causes elastic deformation, and the magnetic head 7 attached to the lower part of the elastic member 3
moves downward in the figure, but the magnetic scale 6 attached to the holder 5, which is not affected by the force to be measured, does not move. It is possible to know the amount of elastic deformation of.

The scale of the magnetic scale detected by the magnetic head is determined by the arithmetic circuit 9.
By F#! The signal is converted by the display D10 and displayed as the magnitude of force or weight.

FIG. 4 is an explanatory diagram showing an embodiment of the force meter according to the present invention, in which the elastic member is a loop.

11 is a stage, 12 is a loop, 13 is a support base, 14 is a scale holder configured integrally with the loop parallel to the line of action of the load inside the loop 12, and 15 is a scale holder 14 inside the loop 12. It is a head holder that is physically constructed with a loop parallel to the .

The loop 12 is fixed to a support 13, and the object 8 with the load to be measured is placed on the stage 11.

The magnetic scale is provided on the scale holder 14, and the magnetic head is provided on the head holder 15, and the magnetic scale 6 and the magnetic head 7 form an elastic deformation sensor as a pair.

The magnetic head 7 is provided at a position facing the magnetic scale 6 so as to be able to detect the graduations of the magnetic scale 6, and is configured such that its tip lightly contacts the graduations of the magnetic scale 6 or approaches the graduations of the magnetic scale 6 at a predetermined minute interval.

When the object 8 is placed on the stage 11, the loop 12 is elastically deformed, and the magnetic scale 6 attached to the scale holder 14
moves downward in the figure, but the magnetic heald 7 attached to the hed holder 15 remains stationary, so the magnetic helad 7
By detecting the movement of the scale of the magnetic scale 6, the amount of elastic deformation of the loop 12 can be determined.

The graduations of the magnetic scale 6 detected by the magnet 7 are decoded by the arithmetic circuit 9, and the signal is converted by the display 10 and displayed as the magnitude of force or weight.

Since the present invention is structured like a ridge, according to the present invention,
It is possible to provide a force meter that is easy to handle due to its simple structure, has high measurement accuracy, is robust as a whole, and is resistant to shock and temperature changes.

The configuration of the present invention is not limited to the embodiment on the ridge, and the shape of the elastic member, the method of attaching the magnetic scale and the magnetic head, etc. can be freely changed within the scope of the purpose of the present invention. Furthermore, the width of the scale of the magnetic scale can be set freely, and the display method may be analog or digital display, or even the magnitude of the current, and the present invention encompasses all of these. It is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the force meter according to the present invention,
FIG. 2 is an explanatory diagram showing another embodiment of the present invention, FIG. 3 is an explanatory diagram showing still another embodiment of the present invention, and FIG. 4 is an embodiment of the present invention in which the elastic member is a loop. FIG. 1・・−−−m−−−−−・・−1−−−−−・−force meter 3−1−−・−・−・−・−−−−−1−−−−Elastic member 5−・・−・−−−−−−1・・−−−1～−−−
Holder 6.6a, 6b-----Magnetic scale 7.7a, 7b--------Magnetic hesode 1
2-1--・−・−・−−−−1−・・・・−Loop 1
4.-----1---------------- Scale holder 15----------------
-----Head holder patent applicant Tsumai Inoue Japax Research Institute Agent (7524) Shota Mogami Figure 3 Figure 4

Claims (5)

[Claims] (1) In a force meter, the magnitude of the force is determined by applying a force to be measured on an elastic member and measuring its elastic deformation, with a magnetic scale installed parallel to the direction of deformation of the elastic member. ,
The dynamometer as described above is equipped with an elastic deformation sensor comprising a magnetic head capable of detecting the graduations of the magnetic scale. (2) The dynamometer according to claim 1, wherein two elastic deformation sensors are provided at the base and the tip of the elastic member. (3) The magnetic scale is constructed integrally with the elastic member,
3. The force meter according to claim 1, wherein the graduations of the magnetic scale are provided directly on the elastic member, and the magnetic head is provided on a holder that is parallel to the elastic member and is not affected by the force being measured. (4) The dynamometer according to claim 1 or 2, wherein the magnetic scale is provided on a holder parallel to the elastic member on which no force to be measured acts, and the magnetic head is provided on the elastic member. (5) The elastic member is a loop, the magnetic scale is provided on a scale holder that is integrated with the loop, and the magnetic head is provided on a head boulder that is integrated with the loop. The dynamometer according to item 1 or 2.