JPH04113002U - distance measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to always accurately measure the distance between two points even if the measurement direction is changed when measuring the distance between two points by unrolling a measurement object. [Structure] An arm 3 that rotates around the measurement reference point 4 of the winder 2 for the wire 1 is provided, and a measurement guide roller 5 is provided on the arm 3 to guide the wire 1 that passes through the measurement reference point 4 and is unwound. will be established. The rotational speed of this measurement guide roller 5 is measured by a rotary encoder 6.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a distance measuring device that measures the length of wires, tapes, etc. by unwinding them. do.

0002

[Conventional technology]

Mark the scale on the wire or tape, wind it up on a winder, and then adjust it according to the length to be measured. This method of unwinding a wire or tape and measuring the distance is widely used. When measuring objects with long measurement lengths, the elongation of the wire or tape may affect measurement accuracy. Steel and stainless steel materials are used because of their high impact. Also, in the case of wires, It is difficult to engrave scale marks on the wire, and it is difficult to read them even if they are carved, so Change the amount of output to the number of rotations of the guide roller, and use a rotary encoder etc. to convert this number of rotations. Measurements are being taken.

0003

[Problem that the idea aims to solve]

When measuring the unwinding amount of wire, etc. using an encoder like this, The outer periphery of the guide roller in contact with the There must be. This invention allows the measurement direction to change when measuring the distance by measuring the amount of unwinding of the measuring object. The purpose of the present invention is to provide a distance measuring device that can accurately measure distances even when

0004

[Means to solve the problem]

In order to achieve the above purpose, the present invention is designed to allow the measuring body winder to rotate around the measurement reference point. A measuring arm installed on this arm that passes through the above measurement base point and is unwound. A guide roller that guides the body and an encoder that counts the number of rotations of this guide roller It is equipped with the following.

[0005]

[Effect] With the above configuration, the outer circumference of the guide roller is wound in a straight line between the measurement reference point and the measurement point. The arm rotates to follow the object to be measured, allowing for accurate measurements.

[0006]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is an oblique view of an embodiment of the present invention. This is a perspective view, where 1 is the wire that measures the distance, and 2 is the wire that wraps around this wire 1 and stores it. Wire 1 is wound around a spring in the wire case, and when wire 1 is pulled out, it is pulled Power is working. 3 rotates around the winding center of this wire case The arm 4 is attached to the center of rotation of this arm 3. It has an opening through which the wire 1 perpendicular to the rotation center axis of the arm 3 passes. 5 is a reference point cap whose measurement reference point is the intersection of the opening of the arm 3 and the central axis of the arm 3. The wire 1 is in contact with the measurement guide roller 5 that guides the wire 1. and rotates as the wire 1 is pulled out and wound up. 6 is this measurement guide A rotary encoder that counts the number of rotations of the drawer 5 and measures the length of the wire 1 drawn out. It is a coda.

[0007] Next, the operation will be explained. The point where you pull out wire 1 and try to measure the distance Position the tip of the wire 1 at one point, and place the reference point cap 4 at the other point. Set the center position of the wire 1 and tighten the wire 1. Wire 1 measures when pulled out Since the guide roller 5 is rotated, a rotary encoder connected to it on the same axis The number of rotations of the wire 6 is counted, and the amount of unwinding of the wire 1 is measured. in this case, The outer periphery of the measurement guide roller 5 in contact with the wire 1 and the measurement reference point of the reference point cap 4 Since the distance between is a constant value, add this value as the initial value of the rotary encoder. I'll keep it. Since the arm 3 freely rotates in the direction of the wire 1, it is connected to the reference point cap 4. A wire 1 is stretched in a straight line between the measurement point and the measurement point, allowing accurate measurement. Figure 2 shows the wire The arm rotates freely as shown in (a) to (b) depending on the direction in which the item is pulled out. show the situation.

[0008] FIG. 3 is a perspective view showing a second embodiment of the present invention. In this example, arm 3 is rotating. The core is attached to the outside of the wire case 2 by providing a bracket 11. Figure 1 The same reference numerals represent members having the same function. 7 was unwound from wire case 2 A first guide roller 8 that guides the wire 1 is provided at the center of rotation of the arm 3 and rotates The second guide roller whose outer periphery in contact with the The third guide roller provided, 10 is the rotation center axis of the arm 3, and 11 is the support for the arm 3. This is a bracket for

[0009] In this example, the measurement reference point is not at the center of the wire case, but at the center of the wire case. This is the center axis of rotation for the outer arm.

0010 Measure the length of the sides by triangulation using the first and second embodiments explained above. , when determining the position, the direction of the arm remains the same even if the measurement direction changes. Since it rotates freely in the feeding direction, the wire 1 is stretched in a straight line between the measurement reference point and the measurement point. distance can be measured with high accuracy.

[0011]

[Effect of the idea]

As is clear from the above explanation, the present invention has an arm in the wire drawing direction. The wire rotates and is stretched in a straight line between the two points to be measured, ensuring accurate distance measurement. can.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a diagram illustrating rotation of an arm.

FIG. 3 is a diagram illustrating a second embodiment of the present invention.

[Explanation of symbols] 1 wire 2 wire case 3 Arm 4 Reference point cap 5 Measuring guide roller 6 Rotary encoder 7 First guide roller 8 Second guide roller 9 Third guide roller 10 Arm rotation center axis 11 bracket

Claims (1)

[Scope of utility model registration request] 1. An arm rotatable around a measurement reference point of a measurement object winder, a guide roller provided on the arm and guiding the measurement object to be unwound after passing through the measurement reference point, and the guide roller. A distance measuring device comprising: an encoder that counts the number of rotations of the device.