JPS60243524A - Part-replacing-time display sensor - Google Patents

Abstract

PURPOSE:To find the replacement time of parts, whose performance is deteriorated with time, by providing a layer, whose color density is lowered with the amount of exposure, providing a layer, whose color is not faded even the layer is exposed, and sticking the layers to equipment. CONSTITUTION:On thick paper 12, a fading layer 13, whose color density is lowered with the increase in amount of exposure, and a non-fading layer 14, whose color is not faded even if the layer is exposed, are provided. The layers are attached to equipment such as copying machine and the like. A part replacing time is acknowledged by the difference between the color density of the fading layer 13, which is changed by the light received during the speciied period up to the replacing film to a part, and the color density of the non-fading layer 14 and by the hues of the layers. The coloring layers are coated by a resin layer 15 so that the fading of the coloring layers is not affected by causes other than the light, e.g., by moisture, gas and the like.

Description

Detailed Description of the Invention Technical Field The present invention relates to a sensor for indicating the time to replace parts such as ozone decomposition filters of electrophotographic copying machines, which deteriorate in performance over time and should be replaced after approximately a certain period of use. .

In the conventional copying process that uses corona discharge to charge and remove static electricity from a photoreceptor, ozone is generated to varying degrees and is discharged to the outside of the machine through an exhaust port. Ozone has a unique odor, and from an environmental standpoint, it is considered undesirable for it to exceed 0.1 ppm. Therefore, it is necessary to provide an ozone decomposition filter near the exhaust port of the snapshot camera to decompose ozone in the exhaust air. If a close-packed activated carbon filter is used, nearly 100% of ozone will be decomposed, but since the filter with this configuration has a large pressure loss, copying machines with heat-generating parts such as light sources and fixing parts are used to reduce the temperature rise inside the machine. In order to prevent
A decomposition filter that uses honeycomb-like or fibrous activated carbon and has low pressure loss, that is, has good ventilation, is used. However, the performance of a poorly filled decomposition filter deteriorates relatively quickly due to changes in the material itself over time.

The ozone removal rate of honeycomb-shaped or fibrous activated carbon varies depending on the ozone concentration in contact with it, but it is predicted from measurement data that it will remove 50% ozone in 100 hours when the ozone concentration is 1 ppm.
%, and at 03'ppm it decreases to 50% in 350 hours. The amount of ozone generated by corona discharge depends on its polarity (
(maximum at negative DC), voltage and current, temperature, humidity, copying speed, and various other factors, but in order to maintain the ozone concentration at the outlet at 0.1 ppm or less at all times,
A rough estimate is 6t once a month, or is, ooo
It is desirable to replace the ozone decomposition filter every time the number of copies is approximately one. However, in the past, it was common for a service person to judge the time for replacement based on the value of the total counter, which had the disadvantage that the time for replacement was not clearly displayed.

OBJECTS It is an object of the present invention to provide a sensor that clearly indicates when to replace parts such as the ozone decomposition filter in the above-mentioned electrophotographic copying machine, which should be replaced at a generally constant period of equipment use.

Structure The component replacement time display sensor of the present invention that achieves the above object includes a fading layer whose color density decreases as the amount of exposure increases;
A layer that does not fade even when exposed to light is provided on the surface of the sheet, and this sensor is attached to equipment such as a copying machine, and when the equipment is in use, the sensor is The relationship between the color density of the fading layer, which has changed due to the light it receives over the course of about 6 months (in the case of about 6 months), and the color density of the non-fading layer allows you to identify when it is time to replace parts. It is characterized by setting conditions for color density and hue and color density and hue of the non-fading layer.

Hereinafter, the present invention will be explained in detail based on drawings and examples.

Example A A photosensitive paper to be used as a display sensor was prepared by applying a photosensitive liquid having the following formulation to 5097 m2 of white cardboard using a glass doctor and drying it with a hair dryer so that the amount of solid matter deposited was 1.097 m2.

Isopropyl alcohol 6〇- Citric acid 20fr β-oxynaphthoic acid morpholinopropylamide 10
2r Caffeine 207r 4-morpholino-2,5-dibutoxybenzenediazonium chloride zinc chloride salt 152r Colloidal silica (average particle size 0.1 μ) 20fr Saponin 1fr Bring the total amount to 1 ton with water.

The experimental raw photosensitive paper was placed in a commercially available diazo copying machine (5D-255 manufactured by Ricoh Co., Ltd.) with 15% monoethanolamine.
fr diethylene glycol monomethyl ether 6CJf/
After adding a developer with a formulation of r ethylene glycol 252r, development was performed without exposure (developer adhesion amount: 1.5 f/?FL2) to obtain a blue colored image with an image density of 1.2. Thus, the colored photosensitive paper was exposed to light in a normal office room under lighting (600 to 1000 tux), and the exposure time and density decrease due to fading were measured.
Curve A in the figure was obtained. In other words, the concentration decreases to about 0.0 after about 3 months.
It dropped to 3.

Example B As a photosensitive solution, 10 fr of β-oxynaphthoic acid morpholinpropylamide in Example A was replaced with 10 fr of β-oxynaphthoic acid ethanolamide, and 4-morpholino-2
, 5-dibutoxybenzenediazonium chloride Zinc chloride salt 15
A photosensitive paper B was experimentally produced in the same manner as in Example A except for using tr. This raw photosensitive paper was developed in the same diazo copying machine as in Example A using the same developing solution without exposure to obtain a blue colored image with an image density of tO. The color-developed photosensitive paper is 600 to 1
The sample was exposed to light under indoor lighting of 000 tux, and the exposure time and density change were measured, and curve B in FIG. 1 was obtained. That is, the concentration decreased to about 0.2 in about 3 months.

If you use the photosensitive paper shown in the above two examples and make it visible that the density of the photosensitive paper changes from 0.2 to 0.3 after 6 months of exposure, then it is time to replace the ozone decomposition filter. It is clear that it has arrived.

In the embodiment shown in FIG. 2, as shown in FIG. 2(a) and FIG.
and non-colored areas 4 are provided alternately, and the colored areas 16 are faded by light irradiation for a predetermined period of time, and when the boundary between the two becomes indistinguishable, as shown in FIG. This is what I did.

The above-mentioned sensor is obtained by pasting light-shielding paper on raw photosensitive paper in a stepwise manner, exposing it to a polyester film, and then developing it.

Other implementation pils shown in Figure 6, I', 1, b) Figure,
(C) As shown in the figure, the display sensor 11 is placed on the cardboard 12 [0
A message such as "Please replace the 3-separation filter" is printed in advance using non-fading ink 14, and a color forming layer 13 of a diazo photosensitive layer is provided thereon. The hue of the printed text is preferably the same as that of the coloring layer, but it does not necessarily have to be the same. Before use, as shown in (a) figure,
The characters on the non-fading layer 14 are hidden by the coloring layer 16 and cannot be read, but the coloring layer fades by being exposed to light for a predetermined period of time under a predetermined illumination, so that the content of the printed text 12 becomes legible. The system instructs you to replace the filter when the problem occurs. The above sensor is obtained by screen printing with an oil-based blue ink, then applying a diazo photosensitive solution and developing it.

In order to prevent the fading of the coloring layer from being affected by factors other than light, such as moisture, gas, etc., it is more desirable to cover the surface of the sensor 11 with a transparent resin layer 15 as shown in FIG. 4. The above resin layer can be formed by applying a moisture-resistant and gas-resistant resin such as polyvinyl acetate or polymethyl acrylate, or by laminating a film.

In the embodiment shown in FIG.
As shown in b), if the printed characters are configured in a dotted manner, this can be effectively prevented.

Since the display sensor of the present invention changes color depending on light, it should be stored in a light-shielding bag or case like photographic film or paper before use to prevent it from being exposed to light, or the top layer should be covered with light. It is preferable to provide a barrier layer so that it can be peeled off during use.

Note that the rate of performance deterioration of ozone decomposition filters and the usage conditions of copying machines (monthly copy volume, lighting conditions at the installation location, etc.) vary, so the display sensor of the present invention can also be set to a function that corresponds to each condition. It is necessary to do so.

The parts display sensor of the present invention is installed at the casing of the ozone decomposition filter 20, the upper surface of the contact glass 21, the inner surface of the original holding plate 22, and the original holding plate, as shown by ■, ■, ■, and ■ in FIG. 6, respectively. Possible positions include the top surface of 22. Among these, the fading speed of ■ and ■ is affected by indoor lighting conditions, but for ■ and ■, respectively, exposure with an exposure light source such as a copying machine, It exhibits a more accurate sensor function as a sensor that indicates when to replace the filter. However, as a rough guide, the position ■■ is sufficient. It goes without saying that the base of the sensor provided at the position (3) needs to be made of transparent film rather than paper.

For example, if the copying machine is used for about 3,000 copies per month, the positions ■ and ■ are sufficient, but if the monthly copy volume varies widely, the positions ■■ provide an exposure value proportional to the number of copies. is appropriate.

Note that the present invention is not limited to the replacement timing display device for the ozone decomposition filter of the electrophotographic copying machine described as the embodiment, but also includes the following:
It can be used as a replacement time indicator for parts that deteriorate over time.

Effects As described above, according to the present invention, it is possible to easily determine when to replace parts whose performance deteriorates over time, thereby making it possible to avoid various problems caused by the use of deteriorated parts.

[Brief explanation of the drawing]

Fig. 1 is a curve diagram showing the relationship between light irradiation time and density change of the photosensitive paper used in the present invention, Fig. 2 and Fig. 6 respectively show all examples of the present invention, and (a) is a curve diagram showing the relationship between light irradiation time and density change of the photosensitive paper used in the present invention. Front (b) shows the state after exposure, (,) is a schematic diagram showing a partial cross section, 4th
The figure is a sectional view of another embodiment, FIG. 5 is a top view of still another embodiment, and FIG. 6 is a perspective view illustrating the mounting position of the display sensor of the present invention.

Claims (1)

[Scope of Claims] (1) A sensor for indicating when to replace parts whose performance deteriorates over time and should be replaced after approximately a certain period of use, includes a fading layer whose color density decreases as the amount of light exposure increases; The surface of the sheet has a layer that does not change in concentration due to the change in concentration due to the change in concentration caused by the sensor, and is attached to a device in which the component is installed, and the fading layer changes due to the light that the sensor receives during a predetermined period of time until the component is replaced while the device is in use. A component replacement time display sensor characterized in that conditions for the fading layer and the non-fading layer are set so that the time to replace the component can be identified based on the relationship between the color density and the color density of the non-fading layer. (2) The display sensor according to claim 1, wherein the fading layer of the display sensor is a coloring layer of a diazo photosensitive layer. (6) The above-mentioned fading layer and non-fading layer are arranged adjacent to each other on the surface of the sheet, and the density and hue of the non-fading layer are the density and hue after the fading layer is exposed to light for the above-mentioned predetermined period. The display sensor according to claim 1 or 2, wherein the hue is equal to the height. (4) In the above sensor, display contents are printed on the surface of the sheet by a non-fading layer, and a fading layer is formed on top of that by covering the entire surface of the sheet.In the initial stage of use, the display contents by the non-fading layer are printed at a high concentration. Claims 1 or 2, characterized in that the display is covered with a fading layer, and the displayed content is made readable by reducing the density of the fading layer by exposure to light for the predetermined period. Display sensor. (5) The display sensor according to claim 4, wherein the printed display contents are arranged in a dotted manner. (6) The display sensor according to any one of claims 1 to 5, wherein the fading layer is covered with a transparent protective layer. (7) The display sensor according to claim 1, wherein the display sensor is coated with a light blocking layer at the beginning of use, and the layer is peeled off when used.