JPS61202108A - Bending detector - Google Patents

Abstract

PURPOSE:To detect the bending of an object to be measured accurately, by providing a smooth carrier surface to measure the quantity of light passing through a clearance between the carrier surface and the object being measured. CONSTITUTION:A light source 5 provided in front of a carrier base 1 is made up of a plurality of light emitting diodes A1, A2... and An arranged side by side at an equal interval while irradiating a light beam with a parallel axis to a gauge 4. Light beam emitted from the light emitting diodes A1-An covers the area as indicated by alternate long and short dash line while phototransistors B1, B2... and Bn are arranged at the position corresponding to the light beam from the light emitting diodes A1-An in the rear of the carrier base 1. The quantity of light measured is converted into an analog voltage value with a sensing circuit 7 at a measuring section 6, outputted as digital signal by a A/D conversion to be taken into a microcomputer 9. The results are displayed on the screen of a CRT10 as bar graph or the like to indicate the degree of the clearance between the object P being measured and the carrier base 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bend detection device for detecting whether a mechanical component such as a stockinette needle is straight.

[Conventional technology]

Conventionally, bending of stockinette needles has been detected by visual inspection by a skilled person.

[Problem that the invention seeks to solve]

However, in conventional visual inspection, the inspection standards differ depending on the inspector and it is impossible to quantify the standard value, so there is a drawback that non-uniformity in the quality of parts is inevitable. In addition, the lack of skilled inspection personnel and the difficulty in shortening inspection time are hindering the reduction in prices of stockinette needles, which are the objects to be measured, and it is also difficult to improve the service life due to uneven quality. It is in.

[Specific Means for Solving the Problems] The present invention has been made in view of the above circumstances, and is a method of bending that can quantitatively express the degree of bending of machine parts such as stockinette needles. For the purpose of providing a detection device, an object to be measured is provided with a mounting table having a smooth mounting surface, and a light source that emits a plurality of light beams with parallel optical axes is provided in front of this mounting table. The gist of the present invention is a bending detection device characterized in that a measurement unit is provided at the rear of the mounting table to measure the amount of the light beam passing through the gap between the mounting table and the object to be measured and to quantify the amount of light.

[For production]

The bending detection device according to the present invention passes a plurality of light beams whose optical axes are parallel to each other through a gap created between a smooth mounting surface and an object to be detected, and determines the gap between the mounting surface and the object depending on the amount of light that has passed through the gap. The degree of

〔Example〕

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

Fig. 1 is a configuration diagram showing the device of the present invention, Fig. 2 is an enlarged front view of the detection section, Fig. 3 is a sectional view of the detection section, Fig. 4 is a table showing the order of irradiation of light beams, and Fig. 5 is a CRT. The detection example shown above is shown.

In the figure, reference numeral 1 denotes a stainless steel object mounting table, and the upper surface thereof is a smooth mounting surface. A gauge 4 is provided at the rear of the mounting table l, which is formed by placing a shielding block 3 on gauge materials 2a and 2b placed on both left and right ends. Note that the height of the gauge 4 is formed to be lower than the height of the object to be measured P placed on the mounting table 1.

Reference numeral 5 denotes a light source provided in front of the mounting table 1, and this light source 5 has an odor to a plurality of light emitting diodes arranged in parallel at equal intervals and emitting light beams whose optical axes are parallel to each other toward the gauge 4. 1. It consists of 8Z + A 3'-8n. light emitting diode ^1
The light rays emitted from 80 to 80 each cover an area as shown by the dashed-dotted line in FIG. On the other hand, behind the mounting table l, phototransistors B+, Bz, Ba to Bn are arranged at positions corresponding to the optical axes of the light beams emitted from the light emitting diodes 8 to An, and the phototransistors 81 to 81 to A measuring section 6 is provided which is equipped with a sensing circuit 7 capable of converting the quantity of light measured by Bn. As shown in FIGS. 2 and 3, a gap y is created between the mounting table l and the object to be measured P due to the bending of the object to be measured, and the light emitting diode ^
Of the light rays X emitted from 1 to ^n, only the light rays X that have passed through this gap y are measured by the phototransistors 81 to Bn. That is, the amount of light measured by the phototransistors B, ~Bn is the same as that of the light emitting diodes A1 ~
It is proportional to the height of the gap y between the measurement object P and the mounting table 1 at the position irradiated with the light beam emitted from An. Incidentally, at this time, the light rays from above are blocked by the shielding block 3.

The light beams emitted from the light emitting diodes 8 to An have parallel optical axes, but if they are emitted at the same time, the light emitting diodes A1 to An or the phototransistor 8
Due to the directivity of 1 to Bn, there is a possibility that it will be sensed by phototransistors other than the corresponding phototransistor. Therefore, it is preferable that the light emitting diodes A, -An emit light with a time difference, and the driver circuit 8 is provided for this purpose. This driver circuit 8 is a circuit that causes the light emitting diodes A, -An constituting the light source 5 to emit light according to a predetermined light emission order. for example,
When 32 light emitting diodes A to An are constructed, they are divided into groups of 8 and these 8 light emitting diodes are arranged as shown in FIG. Eight, l^3. Light is emitted in the order of 8s+As+A2+I'l++A4 with a time difference.

The sensing circuit 7 includes phototransistors B, ~B
In addition to converting the light beam detected by n into an analog voltage value based on the amount of light, and further A/D converting it and outputting it as a digital signal, photometry by phototransistors B and -Bn is performed by the light emitting diodes ^1 to An. photometry is performed in accordance with the order of light emission, and photometry is not performed on phototransistors corresponding to light emitting diodes that do not emit light.

The digital signal output from the sensing circuit 7 is taken into the microcomputer 9 and displayed on the screen of the CRTIO as a bar graph as shown in FIG. In the graph of FIG. 5, each bar represents the amount of light measured by phototransistors B, ~Bn, i.e., light emitting diodes A,
It represents the degree of the gap between the object to be measured P and the ili mounting table 1 at the positions corresponding to ~An and the phototransistors B and ~Bn.

Note that the bend detection device according to the present invention is not limited to the above embodiment, and the number of light sources, etc. can be changed as necessary. Further, if the light source such as a light emitting diode or phototransistor and the measurement unit have ideal directivity, it is not necessarily necessary to perform light emission and photometry with a time difference.

〔Effect of the invention〕

As is clear from the above description, according to the bending detection device according to the present invention, a smooth mounting surface is provided and the amount of light passing through the gap created between the mounting surface and the object to be measured is measured. Since the bending of the object to be measured is detected, the detection accuracy is extremely high and uniform compared to human visual inspection. Furthermore, since the bending is detected by measuring the amount of light, it is possible to quantify the degree of bending, and it is also possible to achieve uniform quality. Furthermore, compared to visual measurement by a skilled person, the inspection time can be shortened and the cost of the object to be measured can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing the device of the present invention, Fig. 2 is an enlarged front view of the detection section, Fig. 3 is a sectional view of the detection section, Fig. 4 is a table showing the order of irradiation of light beams, and Fig. 5 is a CRT. The detection example shown above is shown. 1- Mounting stand 5- Light source 6- Measurement part Fig. 4 r^ Fig. 5 Fastball fixed waist position

Claims (3)

[Claims] (1) A workpiece mounting table with a smooth mounting surface is provided, a light source that emits multiple light beams with parallel optical axes is provided in front of this mounting table, and a A bending detection device comprising a measuring section that measures the amount of the light beam passing through the gap between the mounting table and the object to be measured and quantifies the amount of light. (2) The bending detection device according to claim 1, characterized in that a gauge lower than the height of the object to be measured on the mounting table is provided between the object to be measured mounting section and the measuring section. (3) The bending detection device according to claims 1 and 2, wherein the light emission and measurement of each light beam whose optical axes are parallel are performed with a time difference.