JPH04281475A - Image forming device - Google Patents

Abstract

PURPOSE:To easily judge whether an adjustment value inputted in order to adjust an image forming condition approaches the maximum or the minimum of the adjustment feasible range of the condition or not by issuing an alarm when it is decided by a decision means that the adjustment value is over the prescribed range. CONSTITUTION:The various kinds of switches, sensors, display devices or the like are connected to the input and the output terminals of a first CPU 200. A switch matrix and an LED matrix are connected to the output terminal in addition to the various kinds of parts and respectively controlled by the CPU 200 through a decoder 200. A prescribed allowable range including a value approaching the maximum and the minimum of the adjustment feasible range is stored in the CPU 200 together with the adjustment feasible range as for respective adjustment items. Then, when the adjustment value is over the adjustment value inputted at a service adjustment mode processing time, that means, when it approaches the maximum or the minimum of the adjustment feasible range, the display device 94 flickers in a fixed time and the alarm is issued to a service man.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly to a mechanism for adjusting image forming conditions in an image forming apparatus such as an electrophotographic copying machine or a laser printer.

0002

BACKGROUND OF THE INVENTION In general, in image forming apparatuses such as electrophotographic copying machines and laser printers, the erase width at the leading edge of the image, the erase width at the trailing edge of the image, or the timing roller installed just before the transfer section is Image forming conditions such as the amount of copy paper looping at the front can be adjusted to suit the machine conditions. It has been proposed that these adjustments are made exclusively by the manufacturer's service personnel, and the adjustment values are entered using keys installed on the machine's operation panel. By the way, each image forming condition has an adjustable range with its own upper and lower limits, and the closer the adjustment value is to the upper or lower limit, the less favorable the machine operation becomes.
Full-scale adjustment or parts replacement will be required.

However, in conventional copying machines and printers, it is not clear whether the input adjustment value is approaching the upper or lower limit of the adjustable range, and such judgments rely on the experience or intuition of service personnel. Ta.

0004

[Object, structure, and operation of the invention] Therefore, the object of the present invention is to
An object of the present invention is to provide an image forming apparatus that can easily determine whether an adjustment value input for adjusting an image forming condition approaches the upper limit or lower limit of the adjustable range of the condition. In order to achieve the above object, an image forming apparatus according to the present invention includes an input means for adjusting image forming conditions, and an adjustment value inputted from the input means to a predetermined value within an adjustable range of the image forming conditions. and a warning means for issuing a warning when the determining means determines that the adjustment value exceeds a predetermined range. The predetermined range includes a value close to an upper limit or a lower limit within a preset adjustable range of image forming conditions (for example, edge erase width of an image). In other words, the predetermined range is an allowable range that can be treated as an emergency measure. Therefore, if the warning is issued during adjustment work, parts must be replaced or a full-scale adjustment plan must be made during the next adjustment work.

[0005] Furthermore, it is preferable that the predetermined range can be arbitrarily changed within an adjustable range of image forming conditions.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an image forming apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of an electrophotographic copying machine that is an embodiment of the present invention.
(denoted as F) is installed.

The mechanism within the copying machine main body 1 is similar to that of a conventional electrophotographic copying machine. That is, in the center of the copying machine main body 1, a photosensitive drum 2 that can be driven to rotate in a counterclockwise direction is disposed. The photosensitive drum 2 is surrounded by a main eraser lamp 3, a charger 4, an inter-image eraser lamp 5, a magnetic brush type developing device 7, a transfer charger 8, a copy paper separation charger 9, and a blade type cleaner device 10. are arranged in sequence. The photosensitive drum 2 is
It is a drum with a photoreceptor (e.g. selenium) on its surface,
For each copy, the eraser lamp 3 receives light irradiation, the charger 4 charges the image area to a predetermined potential, the inter-image eraser lamp 5 removes the charge from the front/rear end and both ends of the image area, and then the optical system It receives image exposure from 11. The erase width at the front/back end of the image area is adjusted by the on/off timing of the eraser lamp 5. The motor M1 drives the photoreceptor drum 2 and the like.

The optical system 11 is disposed so as to be able to move to the left below the original glass 19 and scan the image of the original set on the original glass 9 onto the photosensitive drum 2 . The optical system 11 includes a light source 12, a first mirror 13, and a second mirror 14.
, a third mirror 15, a projection lens 16, and a fourth mirror 17. When the copying magnification is m, the light source 12 and the first mirror 13 move to the left at a speed of v/m in response to the rotation of the photoreceptor drum 2 at a circumferential speed v (constant regardless of magnification or variable magnification). move, and at the same time the second mirror 14 and the third mirror 15
moves to the left at a speed of v/2m. Along with this movement, the image passes through mirrors 13, 14, 15, lens 16, and mirror 17, and reaches photoreceptor drum 2.

The motor M3 has a light source 12 and mirrors 13 and 14.
, 15. The motor M4 moves the projection lens 16 in the optical axis direction when changing the magnification, and also moves the fourth mirror 17.
to correct the optical path length. The switch SW1 is for detecting whether the optical system 11 is set at the home position. Further, the switch SW2 is for detecting that the optical system 11 has moved to a predetermined position, and the conveyance of copy paper, etc. is controlled based on the detection signal.

The sensor SE1 is attached to the upper part of the projection lens 16, and is used to measure the amount of light reflected from the third mirror 15 and detect the density of the original. The measured value here is used for automatic control of the exposure amount (adjustment of the light amount of the light source 12). On the other hand, on the left side of the copying machine main body 1, an automatic paper feed cassette 20 is placed in the upper paper feed slot, and an automatic paper feed cassette 22 is placed in the upper paper feed slot.
is installed in the lower paper feed slot. The copy paper in the automatic paper feed cassette 20 or 22 is selectively fed to the respective paper feed roller 2.
1 or 23 into the copying machine main body 1, and is temporarily put on standby with its tip in contact with the timing roller 26. At this time, the leading edge of the copy paper forms a loop of a predetermined amount between the timing roller 26 and the conveyance roller 25. The loop amount here is adjusted by the rotation stop timing of the conveyance roller 25.

The copy paper is sent to the transfer section when the timing roller 26 starts rotating based on the timing signal from the switch SW2. Copy paper is
The toner image is transferred to the photoreceptor drum 2 by the corona discharge from the transfer charger 8, and is then transferred from the photoreceptor drum 2 by the corona discharge from the separation charger 9 and the stiffness of the transfer paper itself. Separated. Subsequently, the copy paper is conveyed to the right as the belt 27 rotates clockwise while being sucked onto a conveyor belt 27 equipped with an air suction means (not shown). Next, the toner image is melted and fixed by passing through the fixing device 28 , and is discharged onto the tray 30 from the discharge roller 29 .

Microswitch SW1 is installed in the upper and lower paper feed ports.
1 to SW14 and SW15 to SW18 are installed to detect the size of the copy paper in the cassettes 20 and 22 and whether the copy paper is placed vertically or horizontally with respect to the paper feeding direction. In addition, switches SW11 to SW14, SW15 to S
W18 also detects the attachment and detachment of the cassettes 20 and 22, which means that the presence or absence of copy paper at the paper feed port is indirectly detected. The size and setting direction of the copy paper are detected using a 4-bit code corresponding to the on/off combination of the switches SW11 to SW14 and SW15 to SW18, and stored in the RAM 201 of the first CPU 200 shown in FIG.

The ADF 300 is composed of an original feeding section 310, an original conveying section 320, and an original reversing section 330. The document feeding section 310 includes a paper feeding tray 311 and a paper feeding roller 312.
The paper feed roller 312 is driven by a motor M10. The paper feed tray 311 also includes a sensor S for detecting originals.
E10 is installed. The document transport unit 320 includes a transport belt 321 supported by a plurality of rollers, and a document tray 325.
, a sheet feeding direction switching claw 327, and the conveyor belt 321 can be rotated in forward and reverse directions by a motor M11. The document reversing unit 330 is for automatically reversing the front and back sides of a document having images on both sides, and includes a reversing belt 331 driven in one direction by a motor M12.

The document on the paper feed tray 311 is transferred to the paper feed roller 3.
The paper is fed to the left by the rotation of 12, and the conveyor belt 321
The original is set at a predetermined position on the original glass 19 by the rotation of the original, and is irradiated with light from the optical system 11 here. After the exposure is completed, the original is sent out to the left by the rotation of the conveyor belt 321 and discharged onto the tray 325. For originals that have images on both sides, after the exposure of the first side is completed, the switching claw 327
The document is sent to the document reversing section 330, where it is reversed, and then set again on the document glass 19 with the second side facing down, and exposed to light.

Further, the document transport section 320 can be opened upward, and is configured so that an operator can manually set the document on the document glass 19. Opening/closing of the document transport section 320 is detected by a switch SW5 provided at the top of the copying machine main body 1. This switch SW5 outputs an on signal when the document transport section 320 is closed, and this on signal and the document detection sensor SE1 of the paper feed tray 311
The operation of the ADF 300 and the copying operation of the copying machine main body 1 are correlated by the original detection signal from 0.

Furthermore, a service switch SW8 is installed in the main body 1 of the copying machine. This switch SW8 is turned on by the manufacturer's service personnel during maintenance of the copying machine, and adjustments are made to various parts as detailed below. 2 and 3 show an operation panel provided on the main body 1 of the copying machine. This operation panel is provided with a switch built-in key and a display element, which are indicated by the following reference numbers.

80-89: Numeric keys for setting the number of copies, etc. 90: Print key for starting copying operation. 91: Magnification up key for increasing the copy magnification in steps. 92: Magnification down key for decreasing the copy magnification in steps. 93: Two-digit 7 to display the set number of copies, etc.
Segment indicator.

94: A 4-digit 7-segment display for displaying the set copy magnification, etc. 95: Density up key for increasing image density in steps. 96: Density down key for reducing image density in steps. 97: LED array for displaying image density. Paper selection keys that are not provided with reference numbers other than those listed above;
Magnification selection keys, LEDs for displaying these selections, etc. are provided.

4 and 5 show the input/output configurations of the first CPU 200 that controls the copying machine main body 1 and the second CPU 250 that controls the optical system 11. 1st CPU
Various switches, sensors, indicators, etc. are connected to the input/output terminals 200. In addition to various components, a switch matrix and an LED matrix are connected to the output terminal, and each is controlled by the first CPU 200 via a decoder 202. RAM201 is the first CPU2
00, and the memory is backed up by a battery. The bus 214 connects the second CPU 250 and the third
This is a communication line with the CPU 270.

The input/output port of the second CPU 250 is connected to a scan motor control circuit 251 that controls the scan motor M3 and a motor M4 that moves the projection lens 16.
It is connected to a lens motor control circuit 252 that controls the lens motor. Further, signals from switches SW1 and SW2 that detect the position of the optical system 11 are input. Also, the third
The CPU 270 is for controlling the ADF 300, and its details will be omitted.

In this embodiment, the main body 1 of the copying machine is finely adjusted by a service person in terms of the erase width at the leading edge of the image by the inter-image eraser lamp 5, the erase width at the trailing edge of the image, the loop amount of the copy paper between the rollers 25 and 26, etc. Ru. When the service switch SW8 is turned on by a service person, the copying machine main body 1 changes from copy mode to service mode.
The above-mentioned image forming conditions can be adjusted. Which item to adjust is selected using the numeric keypad on the operation panel. For example, by turning on the numeric keypad 89 whose leading edge erase width is 0, the numeric keypad 89 whose trailing edge erase width is 1 is turned on.
By turning on 0, the loop amount is 2 on the numeric keypad 81
Selected by turning on. The selected adjustment item is displayed on the two-digit display 93 as a service code. Input for adjustment is performed using a magnification up key 91 and a magnification down key 92. When the magnification up key 91 is turned on once, one point is added to the adjustment value, and when the magnification down key 92 is turned on, one point is subtracted. The changed adjustment value is displayed in the lower two digits of the four-digit display 94. Hereinafter, such adjustment processing will be referred to as service adjustment mode.

The first CPU 200 stores the adjustable range for each adjustment item as well as a predetermined allowable range that includes values close to the upper and lower limits. When the adjustment value input during the service adjustment mode process exceeds the allowable range, in other words, when it approaches the upper or lower limit of the adjustable range, the display 94 blinks for a certain period of time to warn the serviceman.

Furthermore, in this embodiment, the above-mentioned tolerance range can be changed. The upper limit of the allowable range can be set by turning on the magnification up key 91 and magnification down key 92.
It is set by increasing or decreasing the upper limit value one point at a time. Further, the lower limit of the allowable range is set by turning on the density up key 95 and the density down key 96 to raise or lower the lower limit value one point at a time. below,
Such processing is called range setting mode.

The service adjustment mode and range setting mode are selected by a service person using a ten-key key. That is, when the 0 numeric keypad 89 is turned on, the range setting mode is selected, and when the 1 numeric keypad 80 is turned on, the service adjustment mode is selected. Hereinafter, the control procedure of the copying machine main body 1 by the first CPU 200 will be explained with reference to the flowcharts of FIGS. 6 to 14.

FIG. 6 shows the main routine of the first CPU 200. When the power is turned on, the program starts, and first, in step S1, initial settings such as clearing the RAM, setting various registers, and setting each device to the initial mode are performed. Subsequently, in step S2, the first CPU 20
Starts the internal timer built into 0. The value of this internal timer is set in advance in the initial setting in step S1.

Next, various subroutines are sequentially called,
Perform necessary processing. That is, in step S3, inputs from keys for various settings are processed, and in step S4, displays on various displays are processed. The subroutines of steps S3 and S4 will be detailed below. In step S5, a copying operation is processed, and in step S6, other processes such as temperature control of the fixing device 28 are performed. The subroutines of steps S5 and S6 are similar to those of conventional copying machines, and the details thereof will be omitted.

After calling each subroutine, wait for the internal timer to end in step S7, and then proceed to step S2.
Return to The time length of one routine is used to count the various timers that appear in each subroutine. On the other hand, data communication with the second CPU 250 and the third CPU 270 is performed by interrupt processing asynchronous to this main routine, and will not be particularly described here.

FIGS. 7 to 9 show a subroutine for processing the setting input executed in step S3. Here, information input from various setting keys is processed. Processing is roughly divided into copy mode and service mode. First, in step S301, it is determined whether or not the copy mode is set. If the copy mode is set, the processing in the copy mode of steps S302 and S303 is performed, and if the copy mode is not the service mode from step S310 onwards. Processing is performed.

If the copy mode is set, the setting of the number of copies is processed in step S302, and the process proceeds to step S3.
In step 03, the magnification setting is processed. Subsequently, step S30
In step S308, it is determined whether the service switch SW8 is turned on or not, and if it is not turned on, inputs from other keys are processed in step S308. If the service switch SW8 is turned on, the service code is stored in the RAM in step S305.
201. The service code is entered by inputting the item of the image forming conditions to be adjusted using the numeric keypad. Subsequently, the service selection mode is set in step S306, the copy mode is reset in step S307, and the process moves to step S308.

[0030] When switching to service selection mode,
If the determination in step S301 is NO, the process proceeds to step S3.
10, check whether the service switch SW8 is on or off. If it is turned off, the copy mode is set in step S311, and the process moves to step S308. If it is turned on, it is determined in step S312 whether the service select mode is set, and if it is set, it is determined in step S318 whether or not the numeric keypad 80 or 89 is turned on. If the numeric keypad 89 is turned on, the range setting mode is set in step S314. Numeric keypad 80
If it is turned on, the service adjustment mode is set in step S315. After that, if NO is selected in step S312,
It is determined that the range setting mode (steps S330 to S3
46) or service adjustment mode (step S321
- S326) are processed.

That is, if the service adjustment mode is set, YES is determined in step S320, and the magnification up key 91 or magnification down key 9 is pressed in step S321.
2 is on. If none of them are turned on, the process immediately moves to step S308. When either one is turned on, the service code (adjustment item) is checked in step S322, and the adjustment value is increased or decreased in accordance with the service code.

If the tip erase width is adjusted, it is determined in step S323 whether the magnification up key 91 has been turned on, and if it has been turned on, the current adjustment value of the tip erase width, FRERAS, is adjusted in step S324. It is determined whether the value is smaller than the upper limit value Max of the adjustable range. NO
If so, the adjustment value cannot be increased any further, so the process moves to step S308, and if YES, the process moves to step S32.
5, add 1 to the adjustment value FRERAS. If the magnification down key 92 is turned on, step S323
The determination is NO, and the current adjustment value F is determined in step S326.
After confirming that RERAS is larger than the lower limit value Min of the adjustable range, the adjustment value FRERA is set in step S327.
Subtract 1 from S.

That is, the adjustment value FRERAS is incremented by 1 each time the magnification up key 91 is turned on, and the adjustment value FRERAS is subtracted by 1 each time the magnification down key 92 is turned on. However, if the adjustment value FRERAS becomes equal to the upper limit value or the lower limit value, no further increase or decrease is performed. Furthermore, the same process as described above is performed when adjusting the trailing edge erase width, loop amount, or other image forming conditions.

On the other hand, if the range setting mode is set, NO is determined in step S320, and step S3
At 30, it is determined whether either the magnification up key 91 or the magnification down key 92 is on. If none of them are turned on, the process immediately moves to step S308. If either one is turned on, the service code (
Adjustment items) and set the upper limit of the allowable range according to the service code below.

If the allowable range of the tip erase width is to be set, it is determined in step S332 whether or not the magnification up key 91 has been turned on, and if it has been turned on, the process is performed in step S33.
3 indicates Hf, which is the current upper limit of the allowable range of the tip erase width.
It is determined whether reras is smaller than the upper limit value Max of the adjustable range. If NO, further increase value Hfr
Since eras cannot be increased, the process moves to step S308, and if YES, the upper limit value Hfr is increased in step S334.
Add 1 to eras. If the magnification down key 92 has been turned on, the determination in step S332 is NO, and in step S325 it is confirmed that the current upper limit value Hfreras is greater than the value obtained by adding 1 to the lower limit value Lfreras of the current allowable range. Moreover, 1 is subtracted from the upper limit value Hfreras in step S336.

That is, in the range tolerance setting mode, the upper limit value Hfreras of the tolerance range is increased or decreased each time the magnification up key 91 or the magnification down key 92 is turned on. however,
If it becomes equal to the upper limit value Hfreras+1, no further subtraction is performed. Lower limit of allowable range Lfreras
The settings are made by turning on the density up key 95 or the density down key 96. In this case, step S330
The determination is NO, and in step S340 it is determined whether either the concentration up key 95 or the concentration down key 96 is on. If none of them are turned on, the process immediately moves to step S308. If either one is turned on, the service code (adjustment item) is checked in step S341, and the lower limit of the allowable range is set in accordance with the service code.

If the allowable range of the tip erase width is set, it is determined in step S342 whether or not the density up key 95 has been turned on, and if it has been turned on, the process proceeds to step S34.
3 indicates the current lower limit of the allowable range for the tip erase width Lfrer
It is determined whether or not as is larger than the current allowable range upper limit value Hfreras minus 1. If NO, further increase in the lower limit value Lfreras is meaningless, so the process moves to step S308, and if YES, 1 is added to the lower limit value Lfreras in step S344. If the concentration down key 96 has been turned on, the determination in step S342 is NO, and in step S345 it is confirmed that the lower limit value Lfreras is greater than the lower limit value Min of the adjustable range, and in step S346 the lower limit value Lfr
Subtract 1 from eras.

The same process as described above is also performed when setting the upper and lower limits of the allowable range for the trailing edge erase width, loop amount, or other image forming conditions. Figure 11
shows a subroutine for processing the display on various display devices executed in step S4. Here, information output from various setting keys, switches and sensors inside the copier is displayed on the operation panel. That is, in step S41, the display on the 7-segment displays 93 and 94 is processed, in step S42 the exposure level is displayed on the display LED array 97, and in step S43, the selected paper feed port and copy paper size are displayed. etc. and other displays.

FIGS. 12 to 14 show a subroutine for 7-segment display executed in step S41. First, in step S410, it is determined whether the copy mode is set. If the copy mode is set, in step S411, the number of copies is displayed on the two-digit display 93, and in step S412, the magnification is displayed on the four-digit display. It is displayed on the display 94. If the copy mode is not set (NO in step S410), that is, if the service mode is selected, it is determined in step S413 whether the service select mode is set. If set, step S
414 and S415, the displays 93 and 94 are blanked.

When the service adjustment mode or the range setting mode is set, the determination in step S413 is NO, and one of the following modes (steps S420 to S430 for the service adjustment mode and steps S440 to S443 for the range setting mode) is selected. It is processed. That is, if the service adjustment mode is set, Y is selected in step S416.
It is determined to be ES, and the service code (
(adjustment items selected by the service person) are displayed on the two-digit display 93. Subsequently, in step S421, the service code is checked, and display processing is performed in accordance with the service code.

First, in step S422, the current adjustment value F
In step S423, it is determined whether RERAS is larger than the upper limit value Hfreras of the allowable range.
It is determined whether it is smaller than eras. YES to both
If so, the adjustment value exceeds the upper or lower limit of the allowable range, and the displayed adjustment value is flashed to issue a warning to the service engineer. That is, after confirming that the blinking timer has ended in step S424, the process proceeds to step S4.
At step 25, it is determined whether the four-digit display 94 is turned on. If it is turned on, the display 94 is turned on in step S426.
is blank, and if it is off, the adjustment value FRERAS is displayed in the lower two digits of the display 94 in step S427. Thereafter, a blinking timer is started in step S428. It is preferable that the set time of the blinking timer is a time necessary for a service person to confirm that the display 94 is blinking.

On the other hand, if the adjustment value FRERAS is less than or equal to the upper limit value Hfreras of the allowable range and greater than or equal to the lower limit value Lfreras (NO in both steps S422 and S423),
), the blinking timer is stopped in step S429, and the adjustment value FRERA is displayed in the lower two digits of the display 94 in step S430.
Display S. Further, if the range setting mode is set, NO is determined in step S421, and step S421 is determined to be NO, and step
440 to display the service code (adjustment item) on the two-digit display 9
Display on 3. Subsequently, in step S441, the service code is checked, and display processing is performed in accordance with the service code. That is, in step S442, the upper limit value Hfreras of the allowable range is displayed in the lower two digits of the display 94,
In step S443, the lower limit value Lf is displayed in the lower two digits of the display 94.
Display reras.

It should be noted that the image forming apparatus according to the present invention is not limited to the above-mentioned embodiments, and may be modified within the scope of the gist thereof. For example, image forming conditions can be adjusted by inputting keys from the operation panel, by providing a separate input means exclusively for service personnel, by inputting from an external terminal, or by inputting through a telephone line. good.

[0044]

Effects of the Invention As is clear from the above explanation, according to the present invention, a warning is issued when the input adjustment value exceeds a predetermined range within the adjustable range, so that the current adjustment value You can easily confirm that you are approaching the upper or lower limit of the possible range, and whether future maintenance will require only minor adjustments.
You can determine in advance whether parts need to be replaced or full-scale adjustments are needed.
Planned maintenance becomes possible.

[Brief explanation of the drawing]

The drawing shows a copying machine that is an embodiment of the present invention.

FIG. 1 is an internal configuration diagram of a copying machine.

FIG. 2 is a plan view showing a part of the operation panel of the copying machine.

FIG. 3 is a plan view showing other parts of the operation panel of the copying machine.

FIG. 4 is a circuit diagram showing a part of the control section of the copying machine.

FIG. 5 is a circuit diagram showing other parts of the control section of the copying machine.

FIG. 6 is a flowchart showing the main routine of the first CPU.

FIG. 7 is a flowchart showing part of a subroutine for key input processing.

FIG. 8 is a flowchart showing part of a subroutine for key input processing.

FIG. 9 is a flowchart showing part of a subroutine for key input processing.

FIG. 10 is a flowchart showing part of a subroutine for key input processing.

FIG. 11 is a flowchart showing a subroutine of display processing.

FIG. 12 is a flowchart showing part of a subroutine of display processing on a 7-segment display.

FIG. 13 is a flowchart showing part of a subroutine of display processing on a 7-segment display.

FIG. 14 is a flowchart showing part of a subroutine of display processing on a 7-segment display.

[Explanation of symbols]

SW8…Service switch 2...Photoreceptor drum 5...Eraser lamp between images 11...Optical system for image exposure 25...Sheet conveyance roller 26...Timing roller 80-89…Numeric keypad 91, 92...Magnification input keys 95, 96...Image density input key 93,94...7 segment display 200...Microcomputer 201...Random access memory

Claims (2)

[Claims] 1. An input means for adjusting image forming conditions, and a determination for determining whether an adjustment value inputted from the input means is within a predetermined range within an adjustable range of the image forming conditions. and warning means for issuing a warning when the determination means determines that the adjustment value exceeds a predetermined range. 2. The image forming apparatus according to claim 1, further comprising range setting means that can change the predetermined range within an adjustable range of image forming conditions.