JPS60254166A - Image forming device - Google Patents

Abstract

PURPOSE:To shorten an adjustment time and to copy an invariably stable image by selecting automatically various image forming conditions which are set perviously; in the control part of a copying machine frame according to image information that a body to be copied has. CONSTITUTION:A main control part 41 controls the whole and consists of a microprocessor and is equipped with a memory 42. The memory 42 is stored with plural optimum electrostatic charging levels and optimum exposure output levels corresponding to various surface potentials of a photosensitive drum. A console panel 31 and a mode changeover switch 44 are connected to the main control part 41 through an input interface 43. A data input mode is specified with the switch 44 and setting items of a quantity, surface potential information, etc., are inputted on the console panel 31. Then the main control part 41 selects the best image forming condition for the setting items in the memory 42 and controls a lamp regulator circuit 46 and a high voltage power circuit 47 through an output interface 45. Consequently, the adjustement time is shortened and a stable image is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as an electronic copying machine using a photoreceptor.

[Technical background of the invention and its problems]

Generally, in an electronic copying machine using a photoconductor, for example, the characteristics of the photoconductor (such as surface potential) vary depending on the individual product, so an operator adjusts the output of the charger that charges the photoconductor each time. The copying process conditions (image forming conditions), such as (the output voltage of the high-voltage transformer for the charger) and the output of the exposure lamp (the voltage between the terminals of the exposure lamp), were adjusted using setting knobs, volume controls, etc. using a measuring device. This has led to various problems, including a significantly longer adjustment time for the adjustment operator and the need for a specialized adjustment operator to set the optimum copying process conditions that match the characteristics of the photoreceptor. .

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to eliminate the need for specialized adjustment workers.
To provide an image forming device that can automatically adjust image forming conditions that match the unique characteristics of a photoreceptor, can always form stable images, and can extremely shorten adjustment time because the device self-adjusts. It is in.

[Summary of the invention]

According to the present invention, image forming conditions are set and controlled in accordance with characteristic information unique to the photoreceptor inputted by an input means.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an electronic copying machine as an example of an image forming apparatus according to the present invention. Namely.

Reference numeral 1 denotes a copying machine main body. A document table 2 for supporting a document is provided on the upper surface of the main body 1. A document holding member 3 is provided on the document table 2 so as to be openable and closable. Above document table 2
An exposure lamp 4 that reciprocates in the direction of the arrow shown on the bottom side
, mirror 5°6.7, lens block 8, fixed mirror 9
By optically scanning the surface of the document using these optical systems, an image of the document is formed on the surface of the photoreceptor drum 10 (slit exposure). The photosensitive drum 10 rotates in the direction of the arrow shown in the figure, and the surface is first charged by the charging device 11, and then an electrostatic latent image is formed on the surface by slit exposure of the image. The latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette J4 by the paper feed row 215 or 16, and is taken out one by one by the paper guide path 17 or J8.
It is guided through the registration rollers 19 and sent to the image transfer section by the registration rollers 19. Here, the paper feed cassettes 13 and 14 are connected to the main body 1.
It is removably provided at the lower right end of the screen, and either one can be selected using an operation panel (not shown). The paper P sent to the image transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 200, and the toner image on the photoreceptor drum 10 is transferred by the action of the charger 200. be done. The transferred paper P is peeled off from the photosensitive drum 10 by the action of the peeling charger 21 and conveyed through the paper conveyance path 22, and is sent to the heat roller 23 as a fixing device provided at the end of the sheet conveyance path 22.
By passing through this, the transferred image is fixed. After fixing, the paper P is discharged to a tray 25 outside the main body 1 by a paper discharge roller 24. Further, after the photosensitive drum 10 has been transferred, the charge is removed by the charger 26, residual toner on the surface is removed by the cleaner 27, and the afterimage is erased by the charge removal lamp 28, so that the drum 10 returns to its initial state. ing.

Figure 2 shows the operation panel 31, including a power switch 32, a copy key 331 for executing the copying operation, a setting for the number of copies in the normal mode, and a numerical setting in the data input mode. A numeric keypad 34 for inputting values (characteristic information), a number display section 35 for displaying the number of copies, a status display section 36 for displaying operating status, etc., a density adjuster 32 for adjusting copy density, and a copying machine for setting copy magnification. A copy magnification setting section 38 for setting the magnification is provided respectively.

FIG. 3 shows the control circuit. That is, the main control section 4 is in charge of controlling the entire copying machine, and is mainly constituted by, for example, a micro processor. A memory 42 is connected to this main control section 41 . This memory 42
A plurality of optimum charging output levels and optimum exposure output levels respectively corresponding to various surface potentials of the photoreceptor drum 10 (code information entered on the numeric keypad 34 in the small data input mode) are listed. ing. Further, the operation panel 31 and a mode changeover switch 44 are connected to the main control section 41 via an input interface 43. This mode changeover switch 41 is provided in the main body 1 and is used to change over between the normal mode and the r-evening input mode when installing equipment. The main control unit 41 includes a lamp 1/guulator circuit 46 that controls the exposure lamp 4 via an output interface 45;
and a high-voltage power supply circuit 4 that drives the charger 1 for charging.
7 etc. are connected to each other, and these are connected to the main control unit 4.
1 respectively.

Next, the operation of such a configuration will be described with reference to chart 70 shown in FIG.

For example, when installing a device, when the power switch 32 is turned on and the data input mode is specified by the mode selector switch 44 provided in the main body 1, the main control unit 4 determines the data input mode, The number of sheets display section 35 is used to display setting items expressed in numerical values. In response to this display, the operator inputs setting values corresponding to the setting items using the numeric keypad 34. The input from the numeric keypad 34 is supplied to the main control section 4 via an input interface 43. As a result, the main control unit 4 stores the input value in the RAM (not shown).
The information is temporarily stored in a storage device, etc., and is displayed on the sheet number display section 35.

Based on this display, the fourth rater performs a diagnosis, and if it is incorrect, inputs the set value again using the numeric keypad 34, and if it is correct, instructs it using the keys above the operation/button 3. Then, the main control section 4 causes the display section 35 to display the next setting item. Thereafter, the setting values of the setting items are sequentially input in the same manner as described above. For example, the setting item is surface potential information, and code information is input as the setting value.

When the setting is completed, the main control unit 41 reads, for example, the charging output level and the exposure output level corresponding to the code information of the surface potential from the memory 32 and temporarily stores them in the RAM. Each circuit 46
．． Each of the 47 conditions is set and controlled. That is, by controlling the high-voltage power supply circuit 47 and varying its output voltage in accordance with the charging output level read above, the charging output of the charging device 1 is set to an optimal value that matches the surface potential of the photoreceptor drum 100. Set.

Further, by controlling the lamp regulator circuit 46 and varying the voltage between the terminals of the exposure lamp 4 in accordance with the exposure output level read above, the output of the exposure lamp 4, that is, the amount of exposure, is adjusted to the surface potential of the photoreceptor drum 100. Set to the optimal value that suits you.

These set values are always stored at constant values unless the power is turned off or the settings are reset externally using hardware, and are used as set values for copying growth conditions during normal copying. Also, at this time, the operator switches the mode changeover switch 44 to the normal mode. When the setting of the copying process conditions is thus completed and the temperature of the hilt roller 23 reaches the fixable temperature, the ready state is reached and normal copying operation becomes possible.

Like the above, the charging output (charge amount) of the charging device 11 can be automatically set and controlled to the optimum value that matches the characteristics of each photoreceptor drum 10, thus keeping the potential on the photoreceptor drum 10 constant. You can also use the exposure lamp 4 as it fades.
The output (exposure amount) can be automatically set and controlled to an optimum value that matches the characteristics of each photoreceptor drum 10. This allows for stable copying of images at all times, and also allows the installation and adjustment of the device to be handled at the user level without the need for specialized adjustment workers, and furthermore, the adjustment time is extremely shortened. be done.

In the above embodiment, the code information as a setting value was inputted using the numeric keypad of the f channel, but the present invention is not limited to this.
The input may be made through a Kugata circuit provided inside the fuselage. Further, by using an external connection device such as a keypad, a controller, or the like, the set values may be changed only when necessary, such as when replacing the photoreceptor. By doing the above, it is possible to prevent setting values from being changed due to operational errors during normal use. Further, although the surface potential is used as characteristic information specific to the photoreceptor, the present invention is not limited to this, and dark decay, sensitivity, layer thickness, and fatigue data may also be used.

In addition, the copying process conditions were changed by inputting a code according to the characteristics of the photoreceptor drum.
However, the copying process conditions may be varied by inputting the life characteristics and fatigue characteristics of consumables used, such as developer, transfer paper, cleaning member, lamps, etc.

Further, in the above embodiment, the case where an electronic copying machine is applied has been described, but the present invention is not limited to this, and can be applied to other image forming apparatuses using photoreceptors such as a facsimile, a laser printer, or a color copying machine.

〔Effect of the invention〕

As detailed above, according to the present invention, image forming conditions can be automatically adjusted to match the unique characteristics of the photoreceptor without the need for a specialized adjustment operator, and stable image formation is always possible. .

Furthermore, since the device self-adjusts, it is possible to provide an image forming device in which the adjustment time is extremely shortened.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and include the following:
' FIG. 3 is a block diagram showing the control circuit, and FIG. 4 is a flow chart for explaining the operation. 2...-Original table, 4...Exposure lamp, io...Photoconductor drum (photoconductor), 11...Charging device, 12...
...Developer, P...Paper, 3...Operation channel 4,
34... Numeric keypad, 41... Main control unit, 42...
memory. 44...Mode selection switch, 46...Lamp regulator circuit, 47...High voltage power supply circuit. Figure 3 Figure 4

Claims (6)

[Claims] (1) An image forming means for forming an image according to image forming conditions set in advance on the photoreceptor, an input means for inputting characteristic information specific to the photoreceptor, and an image forming means according to the input by the input means. An image forming apparatus comprising: a control means for setting and controlling conditions. (2) The image forming apparatus according to claim 1, wherein the input by the input means is a specific value corresponding to characteristic information. (3) The image forming apparatus according to claim 1, wherein the input means is the same as means for inputting image forming information. (4) The image forming apparatus according to claim 2, wherein the input means includes a switching means for switching between input of photoreceptor characteristic information and image forming information. (5) The image forming apparatus according to claim 1, wherein the characteristic information is surface potential information of a photoreceptor. (6) Claim 1, wherein the image forming conditions include the amount of charge and the amount of exposure to the photoreceptor.
The image forming apparatus described in .