WO1989007748A1

WO1989007748A1 - Apparatus for inspecting ridge of elastic body

Info

Publication number: WO1989007748A1
Application number: PCT/JP1989/000156
Authority: WO
Inventors: Toshiyuki Yahata
Original assignee: Bando Chemical Industries, Ltd.
Priority date: 1988-02-20
Filing date: 1989-02-16
Publication date: 1989-08-24
Also published as: JP2582278B2; JPH01213502A; DE3990128T1; DE3990128C2

Abstract

This invention relates to an apparatus for inspecting the quality of a ridge of an elastic body, such as a toner scraping blade of a copier and a wiper of a vehicle, in which the quality of the ridge of an edge part has a direct influence upon the function of the product. The inspection apparatus according to the present invention is provided with a table (1) on which an elastic body (B) to be inspected is fixed, a contact needle (4) supported via a piezo-electric acceleration detector (5) so that the contact needle (4) can contact a ridge (C) of an edge part of the elastic body (B), and a transfer unit (2) adapted to move the elastic body (B) together with the table (1) relative to the contact needle (4). The elastic body (B) is moved relative to the contact needle (4) brought into contact with the ridge (C) of the elastic body (B), so that the variation of the contact pressure of the contact needle (4) is converted into voltage signals through the detector (5). A converted voltage signal level is compared with a present reference voltage signal level, and is binary-coded depending upon whether the absolute value of the actual voltage signal level is larger than the reference voltage signal level. It can be decided on the basis of the binary-coded signals whether the ridge (C) of the edge part of the elastic body (B) has any defect.

Description

Specification

`` Elastic body ridgeline inspection device ''

Technical field

The present invention examines the quality of an elastic body, such as a toning blade for a copying machine or a wiper blade for a vehicle, in which an edge of the edge directly affects the function of the product. It is related to a detection device for performing the inspection. Background art

Conventionally, the following devices have been mainly used as this type of inspection device.

(a) The ridge of the edge of the blade is magnified several tens times by a projector, projected onto a screen, and the image of the enlarged ridge is read by an optical image sensor. A device that detects unevenness of the ridgeline with a cord of the image sensor to determine the quality of the blade (edgeline ridgeline).

(b) Image processing A microscope is mounted on the imaging unit of the Xinxin device, and an enlarged image of the edge of the edge of the blade taken with the microscope is image-processed to detect unevenness of the ridge and to perform the blade. (Edge line)

(c) The stylus is moved by applying a stylus to the surface of the product, the displacement of the stylus is converted into an electric signal and detected, and the original signal is separated through a low-pass filter to separate the swell component signal. The separated swell component signal A device that removes the roughness component signal by removing it from the original signal by a subtraction circuit and detects the waviness and roughness of the product surface based on the waviness component signal and the roughness component signal (Showa 60 year published utility model Publication No. 1 79 9 1 0 No.) _t wherein (a) and inspection system (b) is the blade edge of the ridge-shaped portion in the longitudinal direction normal ridge at intervals of 2 ~ 3 / zm Because it detects irregularities, it takes a long time to inspect each blade, and because the irregularities of ridges and lines are measured by absolute values, they require extremely high precision and are extremely expensive. Even if dust of, for example, about 5 m adheres to the ridgeline of the blade edge, malfunctions occur, and there is a problem of lack of reliability.

The inspection device of (c) requires a longer inspection time than the inspection devices of (a) and (b), and a wave component unnecessary for blade inspection [generally, Blades of the type described above are used in a state in which they are pressed against and adhered to the photosensitive drum glass surface, etc., so that gradual undulations of the blades can be detected as defects. Since the size of the unevenness is measured in absolute value, it is difficult and difficult to judge the quality of the ridge line based on the value of the unevenness, and it is structurally unsuitable for measuring anisotropic material. There was a point.

The present invention has been made in view of the above points, and can easily and surely detect only the sharp irregularities which are fatal defects of a product such as the toner scraping blade described above. The time required for inspection is short and suitable for inspection of a large number of elastic bodies.In addition, the structure is simple, the price of the device itself is low, and even if a little dust adheres, malfunction may occur. To provide an elastic ridgeline inspection device. You. Disclosure of the invention

A ridgeline inspection apparatus according to the present invention includes a mounting table on which an elastic body for inspection is mounted, and a stylus supported via a piezoelectric acceleration detector so as to be able to contact the ridgeline of an edge portion of the elastic body. A moving device for relatively moving the elastic body with the mounting table with respect to the needle; bringing the stylus into contact with a ridge line of the elastic body at a constant pressure; The contact pressure fluctuation of the stylus when the probe is moved is converted into a voltage signal via the piezoelectric acceleration detector, and the converted voltage signal value is compared with a predetermined reference voltage signal value. The binarization is performed based on whether the absolute value is high or low, and the quality of the ridge line of the elastic body is inspected based on the binarized signal. According to this inspection device, the elastic body is moved at a constant speed relative to the stylus in contact with the ridge line of the elastic body at a constant pressure, and the unevenness of the ridge line causes the elastic body to move. The change in the contact pressure of the stylus when the stylus is displaced is converted into a voltage signal by the piezoelectric acceleration detector that holds the stylus, and the converted voltage signal value is set in advance. The signal is compared with the reference voltage signal value and is binarized depending on whether the absolute value is higher or lower, and when a signal that is higher than the reference voltage signal value is generated, the elastic body edge is generated. It is determined that there is a defect in the ridgeline of the part.

In addition, a position detector for a ridgeline of the elastic body that is linked to a relative movement distance of the elastic body with respect to the stylus is provided in the moving device, and the ridgeline position of the elastic body is determined by the position detector. While detecting, based on the size of unevenness Therefore, if the voltage signal value is binarized, not only the quality of the elastic body but also the defect position of the ridgeline of the edge can be grasped at the same time. In the case of the blade for removing toner from the device, the tip of the tip of the stylus in contact with the ridgeline of the blade, width: Q.2 to 1.0 nim, edge angle as viewed from the side : 60 to 90 °, radius of the circular arc at the tip of the blade viewed from the side: 5 to 8 m, stylus pressure on the blade is 1 to, and moving speed of the blade is It is preferable to set it to 100 to 200 mm / sec. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic diagram showing an overall outline of an apparatus for inspecting a ridgeline of a blade for removing toner of a copying machine according to an embodiment of the present invention, and FIG. 2 is a view taken along line Π—]! Of FIG. Fig. 3 is a perspective view of the blade for removing the toner, Fig. 4 is a plan view showing a more detailed embodiment of the inspection device of the present invention, and Fig. 5 is the left side of Fig. 4. Fig. 6 (a) is a graph of the voltage signal converted by the acceleration detector, Fig. 6 (b) is a binarized graph of the voltage signal of Fig. 7 (a), Fig. 7 (a) Fig. 8 is a front perspective view of the stylus, Fig. 8 (b) is a side perspective view, and Figs. 8 (a) to 8 (d) are front views each showing a target object of a blade ridge line. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in detail with reference to the drawings showing its embodiments. In FIGS. 1 to 3, reference numeral 1 denotes a mounting table for detachably mounting a blade B. Shake via screw feeder — C is mounted on pedestal 3 (Fig. 4) so as to be movable in the longitudinal direction of _c

4: A stylus, and the base end of the stylus 4 is fixed to the acceleration detector 5, and as shown in FIGS. 4 and 5, the tip of the stylus 4 is attached to the lower surface of the tip of the balance arm 6. It is supported with the cutting edge 4a facing downward. The balance arm 6 is pivotally supported by a support 7 a on the upper part of a side wall of a support 7 erected on the pedestal 3 near its base end so as to be vertically swingable. A balance weight 8 is mounted at the base end of the arm 6 so that the position can be adjusted.

The tip 4a of the tip of the stylus 4 is perpendicular to the twill line C of the edge of the blade B attached to the mounting table 1 by the balance arm 6. It is configured so that it can be contacted.

The screw feed mechanism 2 of the mounting table 1 has a feed screw rod 2a connected to a drive motor 2b as shown in detail in FIGS. 4 and 5, and the drive motor 2 over 2 b Zheng Ru _c it should be noted that the drive motor over 2 b Tsu Do Ni you'll move along rotates by Ri feed Ne Flip rod 2 a to the rotating mounting table 1 and is Guy Doreru 3 a on the pedestal 3 In order to keep the moving speed of the mounting table 1, in other words, the moving speed of the blade B constant, and to be able to change the moving speed depending on the difference in the elastic modulus of the blade B, a servo motor 1 is used. This is desirable. Then, the blade B to be inspected is mounted at the listening position of the mounting table 1, and the tip 4 a of the stylus 4 is mounted on one end of the twill wire C of the blade B. The contact is adjusted, and the position of the balance weight 8 on the base end side of the arm 6 is adjusted to apply a predetermined load to the stylus 4. In this state, the drive motor 2b is driven to feed. When the rod 2a is rotated at a constant speed, the mounting table 1 moves at a constant speed together with the blade B.

In this way, the stylus C of the blade B moves with respect to the stylus 4, and if the stitch line C has irregularities, the stylus 4 is displaced up and down. The change in the contact pressure when the stylus 4 is displaced up and down is converted into a voltage signal by the piezoelectric acceleration detector 5. Further, the converted voltage signal is amplified by the signal amplifier 11. Then, as shown in FIG. 6 (a), the amplified voltage signal value X is converted to a signal whose absolute value is higher (finger) or lower than the preset reference voltage signal value Y (see FIG. 6 (a)). In 1), the signal is sent to the binarization converter 12, which converts it into a binary value of 1 or 0. The binarization converter 12 is configured to change the reference voltage signal value Y in accordance with the required standard value of the blade B.

Therefore, if there is a concave portion C1 or a convex portion C2 (see FIG. 8) on the ridge line C of the blade B which is equal to or larger than the standard value, the binarization converter 12 will have a function as shown in FIG. 6 (b). , A signal of "1" is generated, and when the signal of "1" is generated, it is determined that the edge C of the blade B is defective. .

On the other hand, the mounting table 1 has a wire rope 13a (fourth position) such that the position detector 13 of the ridge 籙 G of the blade B with respect to the stylus 4 rotates in conjunction with the movement and separation of the mounting table 1. Figure) is connected via.

The signal of “0” or “1” from the binarization converter 12 and the signal of the moving distance of the blade B from the position detector 13 are sent to the signal processor 14 at the same time. In addition, in the signal processor 14, when a signal of “1” is generated in the binary converter 12, the edge C of the blade B is The position is stored in the storage device 1δ, and at the same time, the display 16 displays the position of the ridge line C of the blade 器. Although not shown, the blue lamp is lit while the signal of “0” is generated from the binarization converter 12, and the red lamp for alarm is generated only when the signal of “1” is generated. The lamp may be turned on or an alarm may be generated to warn the user.

In addition, a microscope 9 was installed near the mounting table 1 as shown in Fig. 4 and Fig. 5 at the position where the twill line C of blade I passed, as shown in Fig. 4 and Fig. 5. Defects (concavities and convexities) on the ridgeline C of the blade Β may be directly visually confirmed.

Here, as shown in FIGS. 7 (a) and 7 (b), the stylus 4 has a shape in which the tip of a circular body is sharpened in an ono-shape when viewed from the side. The width (W) of the cutting edge 4a at the tip of No. 4 should be about 0.2-1. The angle (S) of the cutting edge 4a viewed from the side is ^60β to 90 °, and the radius (r) of the arc at the tip of the cutting edge 4a is about 5 to 82 m when viewed from the side. I do. The reason is that if the angle (0) of the cutting edge 4a and the radius (r) of the arc at the tip are too small, the frictional resistance against the blade B increases, and the edge of the blade B is scraped off by the cutting edge 4a. danger is, when reverse the cutting edge "of the angle (0) and the tip of the arc of the radius (r) is too large, the _c is found that the detection accuracy is because decreases, the Sawa针4 at a predetermined contact pressure When the blade B is brought into contact with the twill wire C of the blade B, since the blade B is an elastic body, it is lowered by the cutting edge 4a at the tip thereof, and dents are generated. The downward load acting on the stylus 4 so that it is about 20-30 m (the so-called needle Three

Pressure) is set to l ~ 2 g. The reason is that if the stylus pressure is less than i g, the needle tip 4a vibrates, and if the stylus pressure is more than 2 g, the detection accuracy decreases.

In addition to the above, the moving speed of the blade B with respect to the stylus 4 is an important factor, and the proper moving speed is 100 to 2001 ^ sec. The reason is that when the speed is reduced to about 50 mm / sec, the displacement acceleration of the stylus 4 decreases, and the voltage signal amount decreases to about 1 / 2.5. This is because small defects (relatively small irregularities) at the ridge line C of the blade B cannot be detected.

The specific numerical values for each of the above-mentioned stylus 4 are based on the following conditions (criterion of defect) for the blade for removing toner g shown in FIG. That is,

(1) Blade B is made of polyurethane, and the toner particles to be removed by blade B are usually about 12 ± 3 ii m.

(2) The twill wire C of blade B often has a undulation of about 100 m in the vertical direction along the longitudinal direction. However, blade B is used with the photosensitive drum in close contact with a constant E force. Therefore, even if there is such undulation, the edge C of the blade B surely adheres to the peripheral surface of the photosensitive drum, so that the product does not become a defect. Therefore, as shown in FIGS. 8 (a) to 8 (d), the defect as a product in blade B is caused when the depth or height (h) of the concave or convex portion C2 is 10 m or more. In this case, the ridgeline C has a steep Dfl convexity in which the angle (α) of one of the inclined surfaces of the CO part C1 or the convex part C2 is 45 ° or more.

Next, the inspection mode of the inspection apparatus of the above-described embodiment is described in the first section. Description will be made based on the drawings.

As described above, the tip 4a of the tip of the stylus 4 is fixed at one end on the ridge line C of the edge of the blade 検査 to be inspected, which is attached to the predetermined position of the mounting table 1. A load (for example, 1.5) is placed on the stylus 4 and the blade B is moved by the screw feed mechanism 2 at a predetermined speed with respect to the stylus 4. In this way, the contact pressure fluctuation acting on the stylus 4 during the vertical movement due to the unevenness of the ridge line C is converted into a voltage signal by the piezoelectric acceleration detector 5 holding the stylus 4, The converted voltage signal is amplified by the signal amplifier 11.增 The widened voltage signal value X is compared with the reference voltage signal value Y set in advance by the binarization converter 12, and if the absolute value is higher than the reference voltage value Y, It is binarized to “〖”, and to “0” when it is low.

Then, there is a place where the absolute value of the voltage signal value X becomes higher than the reference voltage signal value Y, and the binarization converter 12 sends the value of “i” to the signal processor 14. It is determined that there is a defect in the edge C of the edge of the blade B when it is displayed on the display 16. In addition, since the signal indicating the position of the ridge line C is sent from the position detector 13 of the ridge line C of the blade B to the signal processor 14 at the same time, the position of the defect of the ridge line C is determined. Displayed on display 16 and can be confirmed.

In addition, since the position of the defective portion of the ridge line C is also stored in the storage device 15, it can be directly confirmed by enlarging and viewing with a microscope 9 or the like after the inspection.

Although the blade B is moved with respect to the stylus 4 in the above embodiment, the blade 4 is moved with respect to the blade B. Alternatively, if the cutting edge 4a of the stylus 4 is made to contact at right angles to the ridge line C of the blade B, the load direction of the needle 4 may be, for example, horizontal.

The ridgeline inspection device for an elastic body according to the present invention having the above-described configuration has the following effects.

(1) Toners, such as blades for scraping off toner, etc., reliably detect only sudden and sudden irregularities that are fatal defects at the edges of the edges of hard materials, and undulations that do not become defects as products Is not detected. In addition, since the size of the unevenness of the ridgeline is expressed as a binary value such as i or 0 instead of an absolute value, the quality of the elastic body can be easily and clearly determined.

(2) The time required for the inspection is extremely shorter than that of the conventional inspection apparatus. (The conventional inspection apparatus (a) and (b) requires about 30 seconds and eight lines, whereas the inspection apparatus of the present invention has about 2 seconds. since second eight lines), ride in suitable test of the elastic body mass number _c

(3) The structure is simpler than the above-mentioned conventional optical inspection apparatus, and the apparatus itself is inexpensive.

(4) Even if dust or the like adheres to the ridgeline of the elastic body, it is removed by the quick needle, so that it does not easily malfunction. Industrial availability

According to the present invention, in addition to the inspection device for the toner scraping blade of the copying machine described in detail in the above embodiment, the quality of the edge line of the edge portion of various elastic bodies such as a vehicle wiper blade is inspected. The same applies to devices.

Claims

A mounting table (1) for mounting an elastic body (Β) for inspection, and a piezoelectric acceleration sensor capable of contacting the edge (C) of the edge of the elastic body (Β). (5) A stylus (4) supported through the stylus (4), and a moving device (2) for moving the viscous body (Β) relative to the stylus (4) together with the mounting table (1). ) And

The stylus (4) is brought into contact with the ridge (C) of the elastic body (Β) at a constant pressure, and the contact of the stylus (4) when the elastic body (Β) is moved with respect to the stylus (4). The pressure fluctuation is converted into a voltage signal via the piezoelectric acceleration detector (5), and the converted voltage signal value is compared with a preset reference voltage signal value to determine whether the absolute value is high or not. A ridgeline inspection of an elastic body characterized in that the ridgeline (C) of the elastic body (Β) is inspected for the quality based on the binarized signal value based on the binarized signal value. Equipment.

The moving device (2) is provided with a position detector (13) for a ridge (C) of the elastic body (Β) interlocked with a relative movement distance of the elastic body (Β) with respect to the stylus (4). The elastic body ridgeline inspection apparatus according to claim 1, wherein the voltage signal value is binarized while detecting the ridgeline position of the elastic body (Β) by the position detector (13).

The tip (4a) of the tip of the stylus (4) where the elastic body (Β) comes into contact with the ridge (C) of the elastic body (Β) has a width (W): 0.2 to i.0 mm, and the edge viewed from the side ( 4a) the angle (theta) of: 60 to 90 ^5, the arc of the cutting edge tip as viewed Ri by laterally radius (r): ridgeline inspection apparatus of the elastic body according to claim 1 or 2 which is 5~ 8μ ιη. 1 ^

4. The elastic body according to any one of claims 1 to 3, wherein a stylus pressure on the elastic body (B) is i to 2 and a moving speed of the elastic body (B) is 100 to 20 Omm / sec. Ridge inspection equipment.

δ. The binarized signal value is displayed on the display (16), or the alarm is activated when the binarized signal value is higher than the reference voltage signal value. The ridgeline inspection device for an elastic body according to any one of claims 1 to 4, wherein the alarm is issued by a warning.