JPS6138585A - Detection for core bar - Google Patents

Abstract

PURPOSE:To detect surely whether a core bar is present or not by arranging a light projecting optical fiber and a light receiving optical fiber adjacently to each other and receiving the light, which is projected from the light projecting optical fiber and is reflected on a work or the like, by a light receiving optical fiber. CONSTITUTION:A device consists of a light projecting optical fiber 2, a light receiving optical fiber 3, a core bar R, work W a detector 5, an alarm buzzer 6, etc. The radiated light is reflected on a core bar R, a cushion rubber C, etc., and a part of this reflected light is made incident on the light receiving optical fiber 3. This reflected light is made incident on the detector 5 and is converted photoelectrically in accordance with the incident luminous flux; and since the output level for the presence of the core bar R is preliminarily set to the detector 5, the alarm buzzer 6 is sounded by comparing discrimination if a level lower than this level is inputted, that is, the core bar R is absent. Thus, the presence/absence of the core bar R is detected.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for detecting a metal core.

(Prior Art) For example, the air cleaner of an automobile attracts a workpiece. ) has four insertion holes for fixing butterflies penetrated through its center, and a ring-shaped cushion rubber is fitted into the holes. Furthermore, it is common practice to insert an Lk core metal into the cushion rubber to achieve a strength of 111 or more (see No. 2N). There are cases where the core metal R is not fully inserted due to work laziness1.For this reason, generally after taking the cushion rubber C to the workpiece W, The presence test was 11. The traditional method of apricot puffing was as follows1 (see Figure 3).

Conventionally, the presence or absence of the core metal R has been determined using a proximity switch SW. However, by moving the proximity switch SW away from the cushion rubber C, the core metal R can be adjusted to the IF standard (not installed T color) 1 to prevent changes in capacitance, etc.
I will decide whether or not to do so. For this reason, if the workpiece W is metallic, there is a possibility that the workpiece W will be detected incorrectly.In order to avoid this malfunction, the lower surface of the core metal R should be The lower surface of the workpiece W: The lower surface of the workpiece W was placed at a lower position.

(Problem to be solved by the invention P, M) By the way, the core R is fitted so that its upper surface is flush with the upper surface of the workpiece W, and in this normal state, 1 The corner of the core metal R is set to be sufficiently small compared to the cushion rubber C so that the low performance of the cushion rubber C is not impaired even if the hole is inserted. Therefore, the difference between the core metal R and the workpiece W (dimension A shown in FIG. 4) cannot be set too large, and in reality, the difference is approximately 1 mm.

Therefore, depending on the pushing state of the core metal R, -)C is the core metal R
Even if the workpiece W is not attached, there is a high risk of erroneously detecting the workpiece W. In addition, since the work of fitting the core metal R is a manual process performed by the writer, this risk is extremely high. Therefore, the present invention aims to provide a detection method that can reliably detect the presence or absence of a core metal. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides that optical fibers for light emission and light reception are arranged adjacently near the cushion rubber. By detecting the reflection caused by the workpiece etc. projected from the optical fiber 7. (1'J light is the light receiving light) and detecting the presence or absence of the core metal by covering it. The idea was to detect the presence or absence of the core metal. .

(Effects of the Invention) Since the method of the present invention is as described above, the light emitted from the light emitting optical fiber is directed onto a workpiece or the like, and then enters the light receiving optical fiber. At this time, the degree to which the light enters the light-receiving optical fiber differs depending on the presence or absence of the core metal, so it is possible to detect the presence or absence of the core metal based on this. Therefore, unlike the conventional method, the presence or absence of the core metal is detected regardless of its fitted state, so that detection errors due to the push-in of the core metal without rising ω are reliably avoided. Also,
Since the light emitted from the light emitting optical fiber becomes a luminous flux with a predetermined spread, the relative T f of the optical fiber and the core metal is
</Even if there is a misalignment, this is absorbed, and it is possible to exhibit the effects of falling down, such as being able to cope with rough inspection conditions in the field.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

First, I will explain about the workpiece W (air cleaner 'icy).In the center of the workpiece W, there is a mounting hole C1 through which a cushion rubber is formed into a ring shape with soft rubber. C is combined 1■. moreover,
A metal ring-shaped core R is fitted into the center of the cushion rubber C. In addition, the core metal R is formed from the cushion rubber C, and the core metal length is the cushion rubber. It is fitted so that it is almost flush with ii.

The workpiece W, which has undergone the process of removing the core metal C1, the core metal R, etc. as described above, is subsequently transferred to the detection culm of the core metal R.

At the detection point 1, an appropriate support 1 is used to hold the workpiece W horizontally as shown in the figure. ) members are in place. J, T, Work W
Optical fibers 2.3 for projecting and receiving light are disposed on the lower surface side of the workpiece W at a position slightly offset from the central axis J of the workpiece W, facing toward the workpiece W. here,
The other end of the light projecting optical fiber 2 is brought close to the light source 4,
The other end of the light-receiving optical fiber 3 is connected to an alarm buzzer 6 via a detector 5. The detection 'P, 5 converts the illuminance of the light that has passed through the optical fiber 3 for burning into an electrical signal and measures it, and by comparing this level with a preset level, it is detected that there is no core metal R. If the
Set the buzzer 6 to sound. I can't stand it.

Next, the method of detecting the metal core will be explained (first, in the horizontal position. First, the workpiece W is held in a horizontal position. At this point b, the light from the light source 4 is connected to the light emitting optical fiber 2 and used as C. 11. X Nodogi,
The light emitted from the optical fiber 2 has a predetermined spread as shown in the figure, and since the optical fiber 2 is set in a rotated position aligned with the center axis of the workpiece W as described above, There is some error in mounting the workpiece W, b.
The core metal R is certainly included in the radiation range at this time.

Now, the synchrotron radiation is reflected by the core R, the cushion gol
3. Person Q=I. When the light Q'1 enters the detector 5 through this, J is output according to the incident light flux (photoelectrically converted, that is, -C electric output according to the front claw of the reflected light). Furthermore, the detector 5 compares the electrical output level with a preset level. In other words, considering that the output level of the reflected light is higher when there is a core metal R than when there is no core metal R, the detector 5 is set to have a higher output level when there is a core metal R, as described above. Therefore, if a level lower than this is input, that is, the core metal R is
If not, the alarm buzzer 6 will sound at this time for comparison and determination. In this way, the presence or absence of the core metal R is detected.

As is clear from the above description, since the method of this example uses reflected light, it is possible to detect the presence or absence of the core metal R regardless of variations in the fit state of the core metal R, unlike the conventional method. can be done. In other words, regardless of the amount of pushing of the core metal R, 1. Since the presence or absence of the metal core R is reliably detected, detection of the workpiece W between the metal core R and the metal core R is avoided. In addition, it is possible to utilize one spread of light projection and two optical fibers.
Because the IJ is arranged offset from the center axis of the workpiece W, even if the retting of the workpiece W is slightly uneven,
You can easily store 1 volume. I'm afraid, I'm going to the scene, 41-L! -b It's too much to respond well to tsu7゛ing.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view schematically showing the detection device according to the present method, Fig. 2 is a perspective view of the workpiece, and Fig. 3 is a front sectional view of the conventional detection method. ... Optical fiber for light emission and light reception 5 ... Detector R ... Core metal W ... Work C ... Cushion rubber - Applicant Kojima Bresue Co., Ltd. Agent Patent attorney Oka [[1 Hidehiko No. 1 Figure 3

Claims (1)

[Claims] A method for detecting the presence or absence of a reinforcing core metal fitted into the center of a cushion rubber attached to a predetermined position of a workpiece, the method comprising: installing optical fibers for light emission and light reception adjacent to the cushion rubber; At the same time, the presence or absence of the core metal is detected by having the light receiving optical fiber receive the reflected light from the workpiece, etc. projected from the light emitting optical fiber, and measuring the difference in reflectance depending on the presence or absence of the core metal. A method for detecting core metal.