JP2001241922A - Belt size measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt size measuring apparatus capable of contactlessly measuring the ride-out(RO) of a belt in the belt size measuring apparatus wherein the belt laid over a driving pulley and driven pulley is tensioned by a specified load and run to measure the shape size of the belt. SOLUTION: The belt size measuring apparatus 1 comprises a projector 10 for projecting a laser beam 12 and a light receiver 11 for receiving the laser beam at both sides of a driving pulley 3 disposed on the upside of the apparatus to detect the respective dark lengths of the driving pulley 3 and a belt 2 shaded from the laser beam 12, and the difference between the dark lengths is detected to measure the ride out(RO) of the belt 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt measuring device for measuring ride-out (RO) of a transmission belt, and more particularly, to a belt measuring device for measuring a ride-out (RO) of a belt wound around a pulley from an outer peripheral surface of the pulley. The present invention relates to a measuring device for measuring a protrusion height.

[0002]

2. Description of the Related Art Conventionally, as a technique for measuring the ride-out (RO) of a belt, a method has been widely used in which an operator manually measures the protruding height one by one using a caliper or a dial gauge. Had been.

[0003] That is, a method of obtaining a ride-out (RO) by measuring a step between a back surface of a belt wound around a pulley and an outer peripheral surface of the pulley. Hereinafter, this method will be described with reference to the drawings.

FIG. 5 is a schematic diagram showing a ride-out measuring method according to a conventional example. In FIG. 5, the ride-out (RO) is indicated by a hatched portion from the back surface of the belt 2 to the outer peripheral surface of the driving pulley 3. Is the dimension value defined by the length of

Therefore, the ride-out (RO) dimension can be measured by applying the dial depth gauge 50 to the back of the belt 2.

[0006] In addition, for example, Japanese Patent Publication No. 2-56620 discloses a device for measuring ride-out (RO). In this method, a roller is arranged at the end of an arm that performs a controllable circular motion, and the roller is positioned by being brought into contact with the back surface of the belt 2 shown in FIG. 5, and the arm is proportional to the movement distance of the roller at this time. Is detected by a pulse transmitter or the like, and the ride-out (RO) is finally measured.

[0007]

However, the method using the dial depth gauge 50 greatly depends on the skill of the worker, and naturally, the measurement accuracy of the ride-out (RO) is not accurate due to human and measuring instruments. Dispersion is involved.

The method described in Japanese Patent Publication No. 2-56620 is an automatic measurement method by mechanization. Although there is a merit that error dispersion by a person and a measuring device can be eliminated, the detection method is a roller and belt 2 method. That there is a problem in controlling the pressing force of the roller due to the contact method of
In addition, since movable parts such as a rotary connecting part of an arm, a gear meshing part, and a reciprocating part of a cylinder rod are frequently used, there is a difficulty in maintaining mechanical accuracy.

[0009]

In order to overcome the above-mentioned problems of the prior art, the present inventors have developed a new ride-out (RO) calculating means which enables measurement without human intervention and without contact. Invented a belt measuring device that has

[0010] That is, the invention of claim 1 is a belt measuring device for measuring the dimensions of each part of the belt by winding the belt around a driving pulley and a moving pulley, applying a predetermined load, and running the belt. A laser beam emitter / receiver comprising a pair of light emitting / receiving sections arranged so as to sandwich the drive pulley from both sides, and detecting the length of a dark portion where the laser beam is shielded by the outermost diameter portion of the drive pulley, and further driving the drive. This is a belt measuring device including: a ride-out calculation unit that detects the length of another dark portion shielded by the outermost diameter portion of the belt wound around the pulley and detects a difference between the lengths of the two dark portions.

According to a second aspect of the present invention, there is provided the belt measuring device as set forth in the first aspect, further comprising a moving means for arbitrarily shifting the line of the laser beam emitted from the light projector in the axial direction of the driving pulley.

According to a third aspect of the present invention, a predetermined number of data is fetched within a predetermined sampling time using the ride-out calculation means, an average value of ride-out and an error variance are calculated, and the fetch is further performed by N 3. The belt measuring device according to claim 1, further comprising an arithmetic unit that calculates an average value and an error variance by repeating the calculation.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of a belt measuring device according to an embodiment, and FIG. 2 is a side view thereof. FIG.
FIG. 4 is a front view showing a method of measuring ride-out (RO) according to the embodiment, and FIG. 4 is a side view thereof. FIG.
6A and 6B are schematic diagrams showing a belt.

First, an outline of a belt measuring device 1 according to the present invention will be described with reference to FIGS. In FIG. 1, a belt pulling device 1 has a driving pulley 3 disposed at an upper portion thereof and a driven pulley 4 disposed at a lower portion thereof. An endless belt 2 is wound around the pair of pulleys. A weight 6 is suspended from the belt 2 via a driven pulley 4, and a predetermined scale load is applied to the belt 2.

According to the present invention, the distance (CL) between pulley centers is measured by the linear scale 5 under the conditions of the scale load, and POC (pulley outer peripheral length) = π × D (pulley outer diameter) +
2 × CL or BOC (belt outer peripheral length) = π × (D
(Pulley outer diameter) + 2 x RO (ride out)) + 2 x C
It is configured to calculate L by calculation.

Next, referring to FIGS. 5, 6A and 6B, the purpose of use of the present invention will be supplementarily described. FIG. 5 shows the belt 2
FIG. 4 is an enlarged cross-sectional view of a part of a state in which is wound around a driving pulley 3.

FIG. 6A shows a belt 2 having a V-shaped cross section.
Is a speed change belt 2 as an example of
FIG. 6B is a sectional view taken along the line AA.

The belt 2 includes a cord 2b, a rubber layer 2c,
Although it is composed of the upper cloth 2a and the lower cloth 2d for reinforcement, the present invention is not limited to this constitution, and the main object is to measure a belt having a V-shaped cross section.

Since the above-mentioned belt is a friction transmission belt utilizing the wedge effect, the amount of the belt 2 falling into the V-groove portion of the driving pulley 3 slightly changes depending on the manufacturing dimensions.

However, the amount of the drop changes due to a synergistic effect of a delicate combination of the manufacturing dimensions of the belt 2, that is, the width, height, and angle. Can not.

Therefore, those skilled in the art can use the ride-out (RO) as an effective measurement dimension without specifying any of the manufacturing dimensions of the belt 2, that is, the width, height, and angle, and covering the influence thereof. ) Practical use of dimensions.

With this ride-out (RO) dimension, the belt outer peripheral length BOC or the nominal upper width can be calculated from the conversion formula shown below.

That is, the belt outer peripheral length BOC can be easily calculated by substituting a measured ride-out (RO) dimension into the following equation.

BOC (belt outer peripheral length) = π × (D (pulley diameter) + 2 × RO (ride out)) + 2 × CL
The nominal upper width can also be easily calculated by substituting the ride-out (RO) measurement dimension.

BW (width on belt) = 2 × RO × tan
(Α / 2) + PW (Pulley upper width) Since a precision-processed pulley is used as the measuring pulley, the dimensions of each part of the pulley in the above formula can be treated as accurate dimensions.

Next, the novel ride-out (RO) calculation means, which is a main part of the present invention, will be described in detail with reference to FIGS. In FIG. 3, the laser beam emitter / receiver is a unit including a light emitter 10 for emitting a laser beam 12 and receiving the light on the opposite side, and the laser beam 12 is emitted from a semiconductor laser light emitting element. The laser beam is transmitted through the lens and converted into a linear parallel beam. This laser beam 12
CC having a predetermined parallel width built in the light receiver 11
The D image sensor receives light accordingly.

When an object interrupts the laser beam 12,
A dark portion proportional to the size is generated in the CCD image sensor of the light receiving portion 11. The CCD image sensor accurately measures the size and position of the dark portion for a predetermined scanning time and outputs the signal to a controller (not shown).

In response to this signal, the controller detects the length of the dark area blocked by the object, and calculates the ride-out (RO) accordingly.

Here, the means for moving the laser beam emitter / receiver will be described in detail with reference to FIGS. That is, the laser marker 20 is a general-purpose laser projector that emits visible light, and the laser marker 20 is arranged on the movable base 22 so as to move integrally with the projector 10 and the light receiver 11.

By irradiating the spot laser 21 emitted from the laser marker 20 to a target measurement point, the laser beam 12 can be easily aimed.

The procedure for setting the irradiation direction of the laser beam 12 by visual guidance of the spot laser 21 will be described below. 3 and 4, the movable table 22 is suspended in a suspended state by two rails 7 provided on a main body frame structure located above the movable table 22.
Can move in the axial direction of the driving pulley.

The moving means of the moving table 22 is such that a rotary handle shaft 23 having a threaded portion on one side is inserted into a thrust bearing built in a bracket 24 fixed to the main body frame structure, and fitted to the threaded portion. This is means for freely shifting the combined moving table 22 in the axial direction of the driving pulley 3 by operating the rotary handle.

Hereinafter, the ride-out (RO) calculating means which is a feature of the present invention will be described step by step.

First, while visually recognizing the spot laser 21 emitted from the laser marker 20, the rotary handle shaft 23 is finely rotated to guide the irradiation point to be located at the outer peripheral surface of the driving pulley 3, substantially at the center.

At this position, a laser beam 12 is emitted from the laser projector 10 and received by the photodetector 11 on the opposite side. At this time, the dark part of the laser beam 12 blocked by the driving pulley 3 is measured as the dark part length 1 as shown in the figure. At the same time, this dark section length 1 is ride out (RO)
Recorded in the controller as the origin of measurement.

Next, the rotary handle shaft 23 is finely rotated again so as to guide the irradiation point to be located substantially at the center of the back surface of the belt 2 wound around the driving pulley 3. At this position, a laser beam 12 is projected from the laser projector 10 and received by the photodetector 11 on the opposite side.

At this time, the dark part of the laser beam 12 blocked by the driving pulley 3 and the belt 2 is as shown in the figure.
Measured as dark length 2 and recorded on controller. When the dark part length 1 is subtracted from the dark part length 2, a ride-out (RO) is obtained as shown in the figure.

Since all of the measurements are performed in a non-contact manner, the measurement accuracy is dramatically improved. This measurement can be performed regardless of whether the belt 2 is running or stopped. However, in practice, a method is used in which the belt 2 is run and a predetermined number of data are automatically captured within a predetermined sampling time.

The measured dimensions of the ride-out (RO) obtained by the above method are sequentially inputted to a personal computer (not shown), converted into a nominal value of an upper width or a belt outer peripheral length (BOC), and Output to a printer or recording medium.

In calculating the belt outer peripheral length (BOC),
Although it is necessary to measure the distance (CL) between the drive pulley 3 and the driven pulley 4 between the axes, in the embodiment according to the present invention, the belt 2 is run to measure the ride-out (RO), and at the same time, the driven pulley 4 is measured. Is measured on the linear scale shown in FIGS. 1 and 2, and the distance between axes (CL) is measured.

[0041]

Embodiments of the present invention will be described below in detail. The belt measuring device 1 of the embodiment includes a pair of driving pulleys 3.
And the driven pulley 4 are arranged in the vertical direction, and the driving pulley 3 arranged on the upper side is connected to a motor 40 and driven at a rotation speed of about 210 rpm.

The driven pulley 4 arranged at the lower part is
1, the movable table 31 is guided by the LM guide 8 and moves in the vertical direction. The movable base 31 has a function of connecting the weight 6 to a lower portion thereof to apply a weight of a predetermined load to the belt 2 and a function of fixing the driven pulley 4 at a predetermined position of the movable base 31, that is, a distance between the shafts ( CL) is changed.

Here, the procedure for attaching the belt 2 will be described with reference to FIG. First, the rod of the center air cylinder 41 is lowered, and the air cylinders 42 on both sides are raised. The weight of the movable base 31 is supported by the air cylinder 41. Thereafter, the driven pulley 4 is moved above the movable base 31 and temporarily fixed, and the belt 2 is wound around the driving pulley 3 and the driven pulley 4 in a state where the inter-axis distance (CL) is reduced.

The driven pulley 4 is pushed down so as to eliminate the slack of the wound belt 2 and is fixed on the movable table 31. When the rod of the air cylinder 42 is lowered in this state, a predetermined load is applied to the belt 2.

Hereinafter, the belt 2 is run, and the ride-out (RO) and the center distance (CL) are measured. When one measurement is completed, the center air cylinder 41 is raised and the driven pulley 4 is raised. This raised position is
The belt 2 is set to be higher than the rod rising position of the cylinder 42, so that the belt 2 can be easily removed and attached. Thereafter, this is repeated.

A laser line gauge VG series (Keyence Corporation) was used as a laser beam emitter / receiver, and a lens movable visible light laser unit (Audio Technica) was used as a laser marker.

When the ride-out (RO) of the belt 2 was measured using the measuring device 1 of the embodiment having the above-described configuration, it was determined that the belt 2 was in a non-contact state. Therefore, it was not necessary to control the contact pressure. The skill of the operator required when using the dial depth gauge 50 is not required, and as a result, a belt measuring device with extremely excellent reproducibility can be obtained.

The measuring range of the belt measuring device 1 according to the embodiment was as follows. That is, the belt outer peripheral length (BOC) was 635 mm to 1524 mm, the belt thickness was 7 to 16 mm, the upper width of the belt was 12 to 36 mm, and the belt angle was 20 to 40 degrees. The measuring pulley has a pulley outer diameter of 95.5 mm and a pulley outer diameter of 140 mm.
A pair of mm precision processing pulleys was prepared and used.

[0049]

According to the first aspect of the present invention, the ride-out (RO) can be measured in a non-contact manner while the belt is running, thereby controlling the measurement pressure peculiar to the contact method or aging the movable part. Problems such as changes are eliminated, and as a result, variations between people and measuring instruments are eliminated, and reproducibility of measured values is greatly improved.

The second aspect of the invention has an excellent effect of facilitating the aiming operation of the laser beam.

According to the third aspect of the present invention, the data can be collected evenly over the entire circumference of the belt ride-out (RO), and real-time statistical processing can be performed, so that the inspection time is greatly reduced. can do. Further, it is possible to calculate the belt outer peripheral length (BOC) and the upper width with higher accuracy by using the measured belt ride-out (RO) and the conversion formula.

[Brief description of the drawings]

FIG. 1 is a front view of a belt measuring device according to an embodiment.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a schematic diagram illustrating a ride-out measurement method according to an embodiment.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a schematic diagram showing a ride-out measurement method according to a conventional example.

6A and 6B are schematic views showing a belt, FIG. 6A is a front view, and FIG. 6B is a cross-sectional view along AA.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 belt measuring device 2 belt 3 drive pulley 4 driven pulley 5 linear scale 6 weight 7,8 LM guide 10 light emitter 11 light receiver 12 laser beam 20 laser marker 21 spot laser 22 carriage 23 rotation handle shaft 31 carriage 40 motor 41, 42 Air cylinder

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA25 BB11 BB15 CC00 FF02 GG06 HH05 HH15 JJ02 JJ25 LL08 MM03 MM07 PP22 QQ25 SS03

Claims (3)

[Claims] 1. A belt measuring device for measuring a dimension of each part of a belt by applying a predetermined load by applying a belt around a driving pulley and a driven pulley, and arranging the belt on both sides of the driving pulley. A laser beam projecting and receiving device comprising a driving pulley and a light receiving device for receiving a linear laser beam toward the belt wound around the driving pulley and receiving the laser beam; Ride-out calculating means for detecting a length of a dark portion shielded by a pulley and another length of a dark portion shielded by a belt wound around the driving pulley and detecting a difference between the lengths of the two dark portions. Belt inspection device. 2. The apparatus according to claim 1, wherein the laser beam emitter / receiver disposed on both sides of the driving pulley includes a moving unit for arbitrarily shifting the laser beam in the axial direction of the driving pulley. Belt measuring device. 3. A predetermined number of data is fetched within a predetermined sampling time by using the ride-out operation means,
3. An arithmetic unit for calculating an average value and an error variance of a ride-out, and further calculating the average value and an error variance by repeating the acquisition N times.
The belt measuring device according to the above.