JPS6334558A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain an optimum image by connecting an information reading means provided in the position opposite to a code recording part on a cylindrical end face of a photosensitive drum to a control means and applying the output of the control means to a charge potential regulator and/or exposure regulator. CONSTITUTION:A code is recorded in the information recording part provided to the cylindrical end face of the photosensitive drum 8. The information reading means 12 for reading the code in the information recording part is provided to the position opposite to the information recording part. A microcomputer 10 as the control means discriminates the code read by the information reading means 12 and regulates the charge potential regulator 9 in such a manner that an electrostatic charger 1 applies the optimum charge potential determined by said code to the photosensitive drum 8 if the drum is applicable. The microcomputer 10 regulates the exposure regulator 11 so that an exposing lamp 13 applies the optimum exposure determined by said code to the photosensitive drum 8. The optimum image is thereby automatically obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus such as a copying machine using a photosensitive drum.

2. Description of the Related Art Conventionally, a photoreceptor drum has been used in a summer protection image forming apparatus as a means for charging, exposing, developing, and transferring the contents of a document by changing its charging state.

Among these 50 steps, in the charging and/or exposure steps, the electro-optical characteristics of the recording material of the photoreceptor drum may differ depending on the individual product, and such In some cases, the optimum charging potential and/or
Or it is necessary to give a certain amount of exposure. Therefore, before the copying machine was shipped from the factory, workers had to adjust the charging potential regulator and/or exposure amount regulator for each photoreceptor drum, and when the copying machine was released on the market. If the photoreceptor drum is replaced after the adjustment has been made, a professional engineer must perform the adjustment.

However, there are variations in mass-produced copying machines, and it is not possible to adjust the optimal charging potential or exposure amount for all of the above sensitivities, and it is necessary to select a photoreceptor drum according to the capabilities of each individual machine. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image forming apparatus configured to obtain an optimal image based on codes recorded on individual photosensitive drums.

Means for Solving Problems> The initial sensitivity of the photoreceptor drum is classified into a plurality of stages and coded, and the corresponding code is determined based on the initial sensitivity measured for each photoreceptor drum.

A recording section on which the code is recorded is provided on the end of the cylindrical surface of the photosensitive drum, and an information reading means is provided at a position opposite to the recording section. The information reading means is connected to the control means, and the output of the control means is applied to the charging potential regulator and/or the exposure amount regulator.

The code read by the target information reading means is input to the control means, and the control means discriminates the code and controls the charging potential regulator so that the charger applies the optimum charging potential determined by the code to the photoreceptor drum. At the same time, the exposure amount regulator is adjusted so that the exposure lamp gives the photoreceptor drum the optimum amount of exposure.

FIG. 2 shows an example of the initial sensitivity distribution of the photoreceptor drum at room temperature. That is, since the sensitivity distribution of mass-produced products covers a wide range with respect to the standard of 3.0 lux/second, for example, this can be classified into six levels: A, B, C, D, E, and F.
Decide on a code for each stage. A dedicated evaluation machine examines the initial sensitivity of each photoreceptor drum and determines which of the classification stages it belongs to, and the corresponding code is also determined. Note that photosensitive drums whose initial sensitivities belong to stages a and b are unusable.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a charger that charges the photoreceptor drum 8, 2 is a rod-shaped lens that forms an image of the content of the document on the photoreceptor drum, 3 is a developer, 4 is a transfer charger, 5 is a separation charger,
Reference numeral 6 indicates a cleaner, and reference numeral 7 indicates a static elimination lamp.

The above code is recorded in an information recording section provided at the end of the cylindrical surface of the photosensitive drum 8. An information reading means 12 for reading the code of the information recording section is provided at a position opposite to the information recording section.

The microcomputer 10 as a control means determines the code read by the information reading means 12, and if the drum is compatible, the charger 1 applies the optimal charging potential determined by the code to the photoreceptor drum 8. Then, adjust the charging potential regulator 9. Similarly, the microcomputer 10 adjusts the exposure amount adjuster 11 so that the exposure lamp 13 provides the photosensitive drum 8 with the optimum exposure amount determined by the code. Also, it is impossible to control within the adjustment range.
That is, when it is determined that the drum is non-conforming, a display to that effect is displayed on the display means 14. Note that the initial sensitivity is the second
There is no code recorded on the photosensitive drum 8 belonging to stage a or b in the figure, and therefore, if there is no code recorded, the microcomputer 10 automatically determines that this is also an unusable photosensitive drum. can be discovered.

FIG. 3 is a flow chart of an embodiment of the present invention. After the power is turned on, the copy start key is turned on, and the information reading means 12 reads the code and sends it to the microcomputer 10. If the microcomputer IO does not have a code or determines that the code is incompatible with the machine, it determines that this is an incompatible photosensitive drum, sets a non-conforming drum flag, displays it, and does not proceed to copying operation. However, in other cases, it is determined that the photosensitive drum is suitable, the copying flag is set, and the image forming conditions are adjusted as described above according to the code. Thereafter, the copying operation starts, and when it is confirmed that the set number of copies has been completed, the copying flag is reset and the copying state returns to the standby state.

As examples of the information recording section and the corresponding information reading means, a magnetic tape and a magnetic head, a digital light contrast and a laser pickup, a hologram 2 and a group of photosensors, etc. can be used. can. Further, as the above-mentioned image quality adjustment, a charging potential regulator 9 and an exposure amount regulator 11 are used.
However, it is also possible to adjust either one of them.

As explained above, according to the present invention, the information reading means reads the code recorded on each photoreceptor drum, and the control means determines the code so that an optimal image can be obtained. Since the image forming conditions are adjusted accordingly, the optimum image can be automatically obtained. There is also the effect that incorrect installation of an unusable photoreceptor drum can be immediately discovered. Therefore, as long as the installation of the photoconductor drum at the time of shipment of the copying machine and the replacement of the photoconductor drum after shipment are done with care to avoid scratches and dirt on the surface of the photoconductor drum, even those without specialized knowledge can easily install the photoconductor drum. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG.
The figure shows an example of the initial sensitivity distribution of the photoreceptor drum at room temperature.
FIG. 3 shows a flowchart of an embodiment of the invention. 1... Charger, 8... Photosensitive drum, 9...
-Charging potential regulator, 10...Microcomputer, 11...Exposure amount regulator, 12...Information reading means, 13...Exposure lamp, 13...Display means.

Claims (1)

[Claims] (1) An image forming means that includes a charging potential regulator that adjusts the charging potential applied to the photoreceptor drum and an exposure amount adjuster that adjusts the amount of exposure applied to the photoreceptor drum as part of its components. In an image forming apparatus that forms an image on a drum, the initial sensitivity of the recording material of the photoreceptor drum is classified into multiple stages, and one of the codes set for each stage is applied to the recording section of the photoreceptor drum. an information reading means for reading the code recorded on the recording section; the code read by the information reading means is discriminated, and in the case of a non-conforming drum, a message to that effect is displayed, and a conforming drum is detected. In some cases, an image forming apparatus comprising: a control means for adjusting the charging potential adjuster and/or the exposure amount adjuster.