JP2002354234A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the distortion of a print picture, which is caused by difference in form reduction rate between carrying directions. SOLUTION: When a write resolution is changed after the start of printing, a polygon period is changed (steps 700 to 703) after a main scan pixel clock is changed. Then it is discriminated whether a form can be carried in both the vertical direction and the horizontal direction or not (step 704). When it can be carried in both directions, the carrying direction of the form is checked (step 705), and a second sub-scan magnification adjustment value and a second main scan magnification adjustment value are set to adjust the magnifications in the case of horizontal carrying (step 707), and a first sub-scan magnification adjustment value and a first main scan magnification adjustment value are set to adjust the magnifications in the case of vertical carrying (step 706). Next, various parameters are set to print the form, and processing is terminated (steps 708 to 710). Since the reduction direction of the form is preliminarily taken into consideration to the first sub-scan magnification adjustment value and the first main scan magnification adjustment value or the second sub-scan magnification adjustment value and the second main scan magnification adjustment value, the same magnifications are given to pictures printed in the vertically carried form and the horizontally carried form.

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 such as a digital multifunction copier having a function of copying, facsimile, and printing and capable of printing according to a plurality of resolutions. The present invention relates to an image forming apparatus suitable for use in a case where the main scanning pixel interval is changed by changing the main scanning magnification and the main scanning magnification is adjusted.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 10-319515 discloses that
There is disclosed a technique for performing image forming magnification in response to a user's request, but does not automatically correct the image magnification for contraction in the paper direction. Japanese Patent Application Laid-Open No. 9-58052 discloses a technique in which when images are formed at different positions and visualized by developing different colors, magnification correction is performed to eliminate equal magnification and eliminate color shift. It has been disclosed. Japanese Patent Application Laid-Open No. 8-258329 discloses a technique in which main scanning magnification correction is performed by a PLL circuit.

[0003]

In a well-known electrophotographic system used in a digital copying machine or the like, a high-temperature, high-pressure roller applies pressure to fix toner on a printing paper. In this process, the printing paper shrinks in a certain direction after the fixing due to the evaporation of the water retained in the water, and the like before the fixing. As the paper shrinks, the image shrinks in the direction in which the paper shrinks.
Even if the printing paper shrinks, by adjusting the magnification of the image in the shrinking direction, it is possible to suppress the shrinkage of the copy image for the original and the shrinkage of the print image for the image data.

Further, the magnification of a printed image differs between a sheet conveyed in the vertical direction and a sheet conveyed in the horizontal direction. In addition, the latent image of the writing optical unit for blinking the laser beam at the pixel cycle, scanning the beam light with the polygon mirror, irradiating the photosensitive drum, and forming a latent image has a small magnification error with respect to the original image. It has occurred.

The present invention suppresses a magnification error between an original image and a printed image, and irrespective of the upper, lower, left, and right output directions of an image.
An object of the present invention is to suppress image shrinkage due to shrinkage of a sheet according to the sheet conveyance direction.

[0006]

In order to achieve the above object, in an image forming apparatus according to the present invention, a setting means for setting a first sub-scanning magnification adjustment value for adjusting a magnification in the sub-scanning direction; Setting means for setting a first main scanning magnification adjustment value for performing magnification adjustment in the main scanning direction after setting one sub-scanning magnification adjustment value, and setting for setting a second sub-scanning magnification adjustment value for performing magnification adjustment in the sub-scanning direction Means for setting a second main scanning magnification adjustment value for performing magnification adjustment in the main scanning direction after setting the second sub-scanning magnification adjustment value; and a first main scanning magnification adjustment value and a first main scanning magnification adjustment value.
The combination with the sub-scanning magnification adjustment value is defined as the first magnification, and the second
The combination of the main scanning magnification adjustment value and the second sub-scanning magnification adjustment value is used as the second magnification, and the first magnification or the second magnification is selected according to the sheet conveyance direction, and the magnification adjustment in the sub-scanning direction and the main scanning direction is performed. And a magnification adjusting means for performing the adjustment.

In another image forming apparatus according to the present invention, a sub-scanning magnification adjustment value for adjusting the magnification in the sub-scanning direction and a main scanning for adjusting the magnification in the main scanning direction in accordance with the combination of the direction and type of paper. A registration unit for registering a magnification adjustment value, a paper feeding unit capable of feeding paper of the same size in a predetermined direction and a direction perpendicular to the predetermined direction, and a determination for determining the direction and type of the fed paper Means, setting means for selecting and setting a sub-scanning magnification adjustment value corresponding to the combination of the determined paper direction and type from the registration means, and setting the sub-scanning magnification adjustment value and then determining the paper direction. Setting means for selecting and setting the main scanning magnification adjustment value corresponding to the combination of the setting and the type from the registration means.

In another image forming apparatus according to the present invention, a sub-scanning magnification adjustment value for adjusting the magnification in the sub-scanning direction and a main adjustment for adjusting the magnification in the main scanning direction in accordance with the combination of the direction, type, and size of the sheet. A registration unit for registering a scanning magnification adjustment value, a paper feeding unit capable of feeding paper of the same size in a predetermined direction and a direction perpendicular to the predetermined direction, and determining the direction, type, and size of the fed paper Means for determining
Setting means for selecting and setting the sub-scanning magnification adjustment value corresponding to the determined combination of the direction, type, and size of the paper from the registration means; and setting the sub-scanning magnification adjustment value, and then determining the And setting means for selecting and setting a main scanning magnification adjustment value corresponding to the combination of the type and the size from the registration means.

In another image forming apparatus according to the present invention, a plurality of paper feeding means for feeding paper such that the direction, type, and size of the paper are different from each other, and a plurality of auxiliary paper feeding means corresponding to each paper feeding means. Registering means for registering a sub-scanning magnification adjustment value for adjusting the magnification in the scanning direction and a main scanning magnification adjustment value for adjusting the magnification in the main scanning direction; discriminating means for discriminating a paper feeding means for fed paper; Setting means for selecting and setting the sub-scanning magnification adjustment value corresponding to the selected paper feeding means from the registration means, and setting the main scanning magnification adjustment value corresponding to the determined paper feeding means after setting the sub-scanning magnification adjustment value And setting means for selecting and setting from the registration means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is an external view of a digital copying machine as an image forming apparatus according to the embodiment of the present invention. 3, reference numeral 300 denotes a document reading unit, 301 denotes a system operation panel, 302 denotes a first paper feed tray for printing paper, 303 denotes a second paper feeding tray for printing paper, 304 denotes a third paper feeding tray for printing paper, and 305 denotes printing paper. A fourth paper feed tray 306 is a print paper discharge tray, and 307 is a front door for maintenance.

FIG. 1 is a configuration diagram showing a beam scanning device in an image forming apparatus according to an embodiment of the present invention. In FIG. 1, writing of print data to the photosensitive drum 106 is performed as follows. First, the beam emitted from the semiconductor laser 108 disposed on the image writing unit control board 109 (208 in FIG. 2) is bent by the cylinder lens 107 and subsequently reflected by the polygon mirror 101. The reflected beam passes through the fθ lens 102 and the toroidal lens 103, so that the dot pitch in the main scanning direction is equalized. The beam subjected to such processing is reflected by the reflecting mirror 105, and the photosensitive drum 106
Scan above. Thereby, writing of the print data is performed.

On the other hand, when the beam irradiation of the semiconductor laser 108 is detected by the synchronization detection lens 104, the position becomes a reference of the writing start position of the main scanning line. This is performed for each main scanning line, and the main scanning image position is adjusted.
The pixel density in the main scanning direction is determined by the light beam emission interval of the semiconductor laser 108 and the rotation speed of the polygon mirror 101. The pixel density in the sub-scanning direction is determined by the rotation speed of the photosensitive drum 106 and the rotation speed of the polygon mirror 101.

When the rotation speed of the photosensitive drum 106 changes, the image is fixed on the paper, the latent image on the photosensitive drum is transferred, and the conveyance of the paper is affected. Therefore, the photosensitive drum 106 is rotated at a constant speed. The sub-scanning pixel density is changed by switching the rotation speed of the polygon mirror 101. The sub-scanning magnification adjustment is performed by the same means as that for changing the pixel density in the sub-scanning direction.
When the sub-scanning magnification is adjusted, the rotation speed of the polygon mirror 101 changes, and the pixel density in the main scanning direction also changes.
The main scanning magnification adjustment is performed by setting the sub-scanning magnification adjustment value and determining the rotation speed of the polygon mirror 101, and then changing the light beam emission interval of the semiconductor laser.

FIG. 2 shows an image writing unit control board 20.
8 (109 in FIG. 1) is a block diagram showing a configuration.
2, a print image control unit 202 includes a CPU 200
The entire image writing unit is controlled by the command (625 in FIG. 6), and the print image signal is transferred to the laser drive circuit 206. The beam synchronization detecting device 204 detects a laser beam scanning reference position in the main scanning direction, and
02 and the phase synchronization circuit 205. The write clock generation circuit 203 sends the clock CLK0 generated in the cycle of the main scanning pixel to the phase synchronization circuit 205.

The phase synchronization circuit 205 corrects the phase of the clock CLK0 based on the synchronization signal sent from the beam synchronization detection device 204, and transfers the clock CLK for turning on the laser for each main scanning pixel to the laser drive circuit 206. The laser drive circuit 206 transmits the print image signal sent from the print image control unit 202 to the clock CL from the phase synchronization circuit 205.
It is sent as a laser drive signal to the semiconductor laser 207 (108 in FIG. 1) at a cycle of K, and the semiconductor laser 207 emits a beam according to the laser drive signal. The polygon motor control circuit 201 controls the polygon motor 101 at a predetermined rotation speed according to a control signal from the print image control unit 202.

FIG. 6 is a block diagram showing a system control unit of the image forming apparatus. In FIG. 6, a system controller 630 has functions of a plurality of applications such as a copy application, a facsimile application, and a printer application, and controls the entire system.
The operation panel control device 631 is a device for inputting settings of the present system and displaying the contents of the status. The image input / output control device 632 reads a document image and writes an image on a transfer sheet by a well-known electrophotographic technique. The image data bus / control command bus 620 is a bus for transferring image data and control commands in a time-division manner.

In the system controller 630, C
The PU 605 controls the system controller 630. The control program of the system controller 630 is written in the ROM 604. RAM 603 is a CP
U605 is a working memory used. NVRAM6
Numeral 02 denotes a nonvolatile memory for storing information of the entire system such as a sub-scanning magnification adjustment value and a main scanning magnification adjustment value. The external device communication control unit 606 controls communication with an external device used for a facsimile and a printer. System I / F
Reference numeral 607 controls transfer of facsimile data and printer data processed in the system according to an instruction from the CPU 605.

The work memory 600 is a work memory for developing images used in the printer. Frame memory 60
Reference numeral 1 denotes a work memory for storing image data of a read image or a write image, and the image data is encoded or a dot image. The FIFO buffer 609 performs data transfer rate conversion when writing an input image to the frame memory 601. Similarly, the FIFO buffer 608 performs speed conversion when data is transferred from the frame memory 601 as an output image. The memory controller 610 controls image input / output between the frame memory 601 and the bus without the control of the CPU 605.

In the operation panel control device 631, the CP
U617 controls the operation panel control device 631.
The control program of the operation panel control device 631 is written in the ROM 616. The RAM 618 includes the CPU 61
7, a working memory. The input device 614 includes:
This is a device for the user to input system settings. The display device 615 is a device for displaying the settings and status of the system for the user to check them. A first main scanning magnification adjustment value and a second main scanning magnification adjustment value, which will be described later, are measured by a sample image in a system adjustment step, and set by the operation panel control device 631.

In the image input / output controller 632, the CP
U 625 controls the image input / output control device 632.
The control program of the image input / output device 632 is written in the ROM 629. The RAM 628 is a work memory used by the CPU 625. Image writing unit 6
23 is a control unit shown in FIG. The image reading unit 624 reflects the lamp light on
This is a unit for controlling a well-known optical scanner for reading by the scanner. The electrophotographic process unit 626 is a unit for controlling a well-known electrophotographic technique in which a latent image written on a photosensitive member with a laser beam is converted into a real image with toner, and the image is transferred and fixed on paper. The transfer paper transport control 627 controls the transport of the paper on which the image is transferred by the electrophotographic unit 626.

Next, referring to FIGS. 4 and 5, transfer paper that can be conveyed in both the vertical and horizontal directions is transferred so that the upper, lower, left and right relations of the images are the same in the shorter sheet length. An embodiment will be described in which, when printing is performed in each of vertical conveyance and horizontal conveyance, the image magnification is equalized by changing the sub-scanning magnification adjustment value and the main scanning magnification adjustment value. The direction in which the paper shrinks is
For most paper, it will be in one direction, portrait or landscape,
The direction depends on the type of paper.

In FIG. 4, no shrinkage occurs in the sheet 400 before fixing, on which the image has been transferred and transferred in the vertical transfer direction. The paper 400 conveyed vertically contracts in the sub-scanning direction after the image is fixed, as indicated by the paper 401. The contraction in the sub-scanning direction depends on the type of paper. The same type of paper of the same size is transported in the horizontal transport direction. Sheet 40 before fixing on which an image has been transferred and transferred in the horizontal transfer direction
No shrinkage occurred in 2. Also, no shrinkage has occurred even after fixing in the horizontal transport direction, as indicated by the sheet 403.

The post-fixing vertical transport paper 401 and the post-fixing horizontal transport paper 403 are the same type of paper of the same size, and the same image data is the same in the vertical and horizontal relationship of the image with the shorter paper length. Is printed like so. In this case, if the magnification adjustment is performed using the same sub-scanning magnification adjustment value and the main scanning magnification adjustment value, the magnification adjustment for the contraction of the paper is not performed. Therefore, as shown in FIG. Compared with 501, the image also shrinks because the vertical transport paper 501 shrinks in the sub-scanning direction.

Therefore, if magnification adjustment is performed using the sub-scanning magnification adjustment value and the main scanning magnification adjustment value that are different in the horizontal conveyance direction and the vertical conveyance direction under the same conditions, the printed image of the horizontal conveyance paper 502 is The image printed on the transport paper 503 can have the same magnification.

A copy image 506 of the original 505 shown in FIG.
Is an example of contraction in the sub-scanning direction. By performing sub-scanning magnification adjustment and main-scanning magnification adjustment accompanying the sub-scanning magnification adjustment, a copy image 504 having the same magnification as the original 505 is printed.

Next, the operation of the first embodiment according to the first aspect of the present invention will be described with reference to the flowchart of FIG. The case where the magnification adjustment control is selected to be performed will be described. As described above, when the paper of the same size and the same type is different in the transport direction between the vertical direction and the horizontal direction, the rate of shrinkage in the transport direction differs depending on the type of the paper. In addition, the direction in which the image contracts varies depending on the contraction direction of the sheet according to the sheet transport direction.

According to the first aspect of the present invention, when the same image data is printed on the paper in each transport direction so that the upper, lower, left, and right relations of the image are the same in the shorter length of the paper, the image is reduced with respect to the contraction of the paper. By performing magnification adjustment using a different magnification adjustment value between the first magnification adjustment value and the second magnification adjustment value,
It is another object of the present invention to reproduce the magnification of the image data and to make the printed images of the paper conveyed in the vertical direction and the paper conveyed in the horizontal direction the same size.

For this reason, in the image forming apparatus according to the first embodiment, the resolution in the main scanning direction and the resolution in the sub scanning direction can be set independently, the magnification in the main scanning direction and the sub scanning direction can be adjusted, In an image forming apparatus capable of printing in accordance with the resolution, a setting means for setting a first sub-scanning magnification adjustment value that can perform magnification adjustment in the sub-scanning direction at arbitrary intervals, and setting after setting the first sub-scanning magnification adjustment value Setting means for setting a first main scanning magnification adjustment value capable of adjusting magnification in the main scanning direction at arbitrary intervals;
A combination of the first main-scanning magnification adjustment value and the first sub-scanning magnification adjustment value is defined as a first magnification, which is a basic magnification, and the paper is conveyed in the right-angle direction at the same size as the sheet printed at the first magnification.
Means for setting a second sub-scanning magnification adjustment value for adjusting the magnification in the sub-scanning direction of the paper to be printed in arbitrary increments; and setting the second sub-scanning magnification adjustment and then adjusting the magnification in the main scanning direction to arbitrary increments. Setting means for setting a second main scanning magnification adjustment value which can be performed by the second main scanning magnification adjustment value and the second sub-scanning magnification adjustment value are set as the second magnification, and the main scanning in the printing direction is performed on paper of the same size. Only the paper size that can be replaced by the difference between the vertical and horizontal transport directions of the paper and the sub-scanning,
The first magnification and the second magnification are automatically determined and selected from the paper transport direction regardless of the printing directions of the left, right, top, and bottom of the printed image, and the magnification of the sub-scanning and the main scanning is adjusted. .

In FIG. 7, the system controller 63
The application No. 0 transmits a print start command to the image input / output control device 632 (step 700). The print start command is accompanied by image information such as image resolution, binary, multi-value selection, paper size, paper transport direction and the like as parameters. Upon receiving the print start request, the image writing unit 623 compares the resolution set in the image writing unit 623 with the image resolution for which the print start request was made, and determines whether there is any change in the writing resolution (step 701). . If there is a change in the writing resolution (step 701 / Yes), the main scanning pixel clock is changed (step 702). The main scan pixel clock is changed by the write clock generation circuit 203. Subsequently, the polygon cycle is changed (step 703). The polygon cycle is changed by the polygon motor control circuit 201.

Next, it is arbitrarily determined in advance whether the sheet can be conveyed in both the vertical conveyance and the horizontal conveyance in the selected size in the main scanning length and the sub-scanning length, or in units of paper size. Judgment is made from the code or the like (step 704). If the sheet can be conveyed in any direction, it is checked whether the sheet is in the horizontal conveyance direction (step 705). The magnification adjustment is performed using the magnification adjustment value and the second main scanning magnification adjustment value (step 707).
If it is vertical conveyance (Step 705 / No), magnification adjustment is performed using the first sub-scanning magnification adjustment value and the first main scanning magnification adjustment value (Step S706). The sub-scanning magnification adjustment is performed by changing the polygon cycle by the polygon motor control circuit 201. The main scanning magnification adjustment is performed by the write clock generation circuit 203.

When the sub-scanning and main-scanning magnification adjustments are completed, parameters are set in the image writing device of the image writing unit 623 (step 708). After the parameter setting is completed, it becomes possible to write images,
The printing of the image data is performed (step 709), and the printing process of one image on the transfer paper is completed when the image writing is completed (710).

According to the above, the first magnification adjustment (the first sub-scan magnification adjustment value and the first
The vertical conveyance paper and the horizontal conveyance paper are adjusted by a magnification adjustment based on a combination of the main scanning magnification adjustment value and a second magnification adjustment (a magnification adjustment based on a combination of the second sub-scanning magnification adjustment value and the second main scanning magnification adjustment value). Is printed on the horizontal transport paper 502
And an image of the same magnification as the vertical transport paper 503. The original 505, the image data, and the print image 504 have the same magnification.

Next, the operation of the second embodiment according to the second aspect of the present invention will be described with reference to the flowchart of FIG.
A description will be given of a procedure for setting a magnification adjustment in which printing is not permitted unless the first magnification adjustment value and the second magnification adjustment value are set. When the sub-scanning magnification adjustment is performed, the main-scanning magnification adjustment is affected. Therefore, if the main-scanning magnification adjustment is performed without performing the sub-scanning magnification adjustment, and then the sub-scanning magnification adjustment is performed, correct magnification adjustment cannot be performed. .

According to a second aspect of the present invention, an erroneous magnification adjustment is performed by setting a main scanning magnification adjustment value without setting a sub-scanning magnification adjustment value, and an image having an erroneous magnification is printed. The purpose is to prevent it.

For this purpose, the image forming apparatus according to the second embodiment has a function of displaying the setting state of the first magnification adjustment value and the second magnification adjustment value. A function for determining whether the main scanning adjustment and the sub-scanning adjustment have been performed, a function for disabling the setting of the first main-scanning magnification adjustment value without setting the first sub-scanning magnification adjustment value, and a second sub-scanning adjustment value. A function that disables the setting of the second main scanning magnification adjustment value without setting the scanning magnification adjustment value, and determines whether the main scanning adjustment and the sub-scanning adjustment of the first magnification adjustment and the second magnification adjustment have been performed. Printing is prohibited unless the first magnification adjustment value and the second magnification adjustment value are set.

The magnification is adjusted by the user using the system operation panel 3.
01 is set. The system operation panel 301 is controlled by the operation panel control device 631.
A control program for setting a magnification adjustment value and the like is written in the ROM 616 and executed by the CPU 617. The magnification adjustment value is input to the input device 614 and stored in the NVRAM 602 until reset.

Referring to FIG. 8, when the setting of the magnification adjustment value is started (step 800), the system is set to the printing prohibited state (step 801). Next, the user selects which of the first magnification adjustment value and the second magnification adjustment value to set (step 802), and shifts to setting of each magnification adjustment value. The setting of the magnification adjustment value is selected between setting of the main scanning magnification adjustment value and setting of the sub-scanning magnification adjustment value (steps 803 and 807), and the setting of the sub-scanning magnification adjustment value can be performed unconditionally (step 804). , Step 808), the main scanning magnification adjustment value is set on condition that the sub-scanning magnification adjustment value has already been set (step 805, step 80).
9) If the sub-scanning magnification adjustment value has not been set, the setting of the main-scanning magnification adjustment value is invalidated.

If the sub-scanning magnification adjustment value has already been set, the setting of the main-scanning magnification adjustment value is validated (steps 806 and 810). If all the magnification adjustment values have been set (step 811 / Yes), the system is set to the printing permitted state (step 813), and if any magnification adjustment value has not been set (step 811 / No). ), Set the system to printing disabled,
The setting process of the magnification adjustment value ends (step 814).

Next, the operation of the third embodiment according to the third aspect of the present invention will be described with reference to the flowchart of FIG. 9 so that the main scanning magnification adjustment value is not set without setting the sub-scanning magnification adjustment value. The following describes a case in which a warning is displayed on the screen, and a setting is made to warn at the time of printing that the magnification is incorrect for image printing ignoring the magnification. As described above, when the sub-scanning magnification adjustment is performed, the main scanning magnification adjustment is also affected. Therefore, if the main scanning magnification adjustment is performed without performing the sub-scanning magnification adjustment, and then the sub-scanning magnification adjustment is performed, the correct magnification adjustment is performed. Can not do.

According to a third aspect of the present invention, a warning is displayed so as not to set the main scanning magnification adjustment value without setting the sub scanning magnification adjustment value. The purpose of the present invention is to set a scanning magnification adjustment value and warn that correct magnification adjustment is performed and that the magnification is not correct for image printing ignoring the magnification, but to enable printing.

For this purpose, the image forming apparatus according to the third embodiment has a function of displaying the setting state of the first magnification adjustment value and the second magnification adjustment value. It has a function of determining whether the main scanning adjustment and the sub-scanning adjustment have been performed. If the first main-scanning magnification adjustment value is set without setting the first sub-scanning magnification adjustment value, the first sub-scanning magnification adjustment value is given to the setter. A display function that warns that the first main scanning magnification adjustment is performed after the scanning magnification adjustment is performed, and a setting of the second main scanning magnification adjustment value without setting the second sub-scanning magnification adjustment value is performed. A display function that warns that the second main scanning magnification adjustment is performed after the second sub scanning magnification adjustment is performed, and whether the main scanning adjustment and the sub scanning adjustment of the first magnification adjustment and the second magnification adjustment are performed is determined. And a function for adjusting the first magnification adjustment value and the second magnification adjustment value. If any of the scanning and the sub scanning performs printing without being set, are made to perform and printed displays a warning may not be correct scale to the user.

The magnification can be adjusted by the user using the system operation panel 3.
01 is set. The system operation panel 301 is controlled by the operation panel control device 631.
A control program for setting a magnification adjustment value and the like is written in the ROM 616 and executed by the CPU 617. The magnification adjustment value is input to the input device 614 and stored in the NVRAM 602 until reset. The state of the magnification adjustment value and the warning display to the user are displayed on the system scanning panel 301 by the operation panel control device 631.

Referring to FIG. 9, when the setting of the magnification adjustment value is started (step 900), the system is set to the printing prohibited state (step 901). Next, the user selects which of the first magnification adjustment value and the second magnification adjustment value to set (step 902), and shifts to setting of each magnification adjustment value. The setting of the magnification adjustment value is selected between the setting of the main scanning magnification adjustment value and the setting of the sub-scanning magnification adjustment value (steps 903 and 908), and the setting of the sub-scanning magnification adjustment value can be performed unconditionally (step 904). , Step 909), the main scanning magnification adjustment value is set on condition that the sub-scanning magnification adjustment value has already been set (step 905, step 91).
0), if the sub-scanning magnification adjustment value is not set, a warning is displayed indicating that the sub-scanning magnification adjustment value is not set (steps 907 and 912), and the setting of the main scanning magnification adjustment value is invalidated. To

If the sub-scanning magnification adjustment value has already been set, the setting of the main-scanning magnification adjustment value is validated (steps 906 and 911). CPU 605 when printing
If all the magnification adjustment values have been set (step 913 / Yes) in order to determine whether or not to display a warning indicating that there is a magnification error (step 913 / Yes), the setting for not displaying a warning is written to the RAM 603. (Step 915) If any magnification adjustment value has not been set (step 913 / No), the setting for displaying a warning is stored in the RAM 603.
(Step 914), the system is set to the print permission state (step 916), and the process of setting the magnification adjustment value ends (step 917).

Next, the operation according to the fourth embodiment of the present invention will be described with reference to the flowchart of FIG.
A case will be described in which, when the first magnification adjustment value is set and the second magnification adjustment value is not set, printing is performed using only the first magnification adjustment value. In order to obtain the effect of the first aspect, it is necessary to perform the first magnification adjustment and the second magnification adjustment.

According to the fourth aspect of the invention, if only the first magnification adjustment value is set and the second magnification adjustment value is not set, the effect of the first aspect cannot be obtained, but the first magnification is not obtained. By selecting an adjustment value, an object is to suppress a magnification error unique to the image forming apparatus included in all images to be printed irrespective of a paper direction, a type, and a size by only the first magnification adjustment.

For this purpose, the image forming apparatus according to the fourth embodiment has a function of displaying the setting state of the first magnification adjustment value and the second magnification adjustment value, and performs the first magnification adjustment and the second magnification adjustment. A function is provided for determining whether the main scanning adjustment and the sub-scanning adjustment have been performed. If the first main-scanning magnification adjustment value is set without setting the first sub-scanning magnification adjustment value, the first sub-scanning If a display function that warns that the first main scanning magnification adjustment is performed after the magnification adjustment is performed, and the second main scanning magnification adjustment value is set without setting the second sub scanning magnification adjustment value,
A display function to warn the setter of performing the second main scanning magnification adjustment after performing the second sub scanning magnification adjustment, and a main scanning adjustment and a sub scanning adjustment of the first magnification adjustment and the second magnification adjustment, respectively. A function is provided for determining whether or not the printing has been performed, and if only the first magnification is set, and if the second magnification is not set, all print images are performed only by the first magnification adjustment regardless of the paper transport direction, paper size, and paper type. Has been made.

The magnification is adjusted by the user using the system operation panel 3.
01 is set. The system operation panel 301 is controlled by the operation panel control device 631.
A control program for setting a magnification adjustment value and the like is written in the ROM 616 and executed by the CPU 617. The magnification adjustment value is input to the input device 614 and stored in the NVRAM 602 until reset. The state of the magnification adjustment value and the warning display to the user are displayed on the system scanning panel 301 by the operation panel control device 631.

In FIG. 10, when the setting of the magnification adjustment value is started (step 1000), the system is set to the printing prohibited state (step 1001). Next, the user selects which of the first magnification adjustment value and the second magnification adjustment value to set (step 1002), and shifts to setting of each magnification adjustment value. For the setting of the magnification adjustment value, it is selected whether to set the main scanning magnification adjustment value or the sub-scanning magnification adjustment value (step 100).
3, step 1008), the setting of the sub-scanning magnification adjustment value can be performed unconditionally (step 1004, step 100).
9) The setting of the main scanning magnification adjustment value is a condition that the setting of the sub-scanning magnification adjustment value has already been performed (step 1).
005, step 1010), if the sub-scanning magnification adjustment value has not been set, a warning is displayed indicating that the sub-scanning magnification adjustment value has not been set (step 1007, step 1012), and the main scanning magnification adjustment value is set. Disable the setting.

If the sub-scanning magnification adjustment value has already been set, the setting of the main-scanning magnification adjustment value is validated (steps 1006 and 1011). If the first magnification adjustment value has not been set (step 1013 / No),
The system is set to a print prohibition state (step 101)
4). If the first magnification adjustment value has been set (step 1013 / Yes), it is checked whether the second magnification adjustment value has been set (step 1015), and if not, (step 1015 / No). Setting for Printing Using Only First Magnification Adjustment (Step 101
6). If the second magnification adjustment has been set (step 1015 / Yes), the setting for printing using the first magnification adjustment and the second magnification adjustment is made (step 1017), and the setting processing of the magnification adjustment value is performed. The process ends (step 1019).

Next, the operation according to the fifth embodiment of the present invention will be described with reference to the flowchart of FIG.
The case where the main scanning magnification adjustment value is automatically selected from the combination of the paper direction and the paper type and the main scanning magnification adjustment control is performed will be described. As described above, when the same size and the same type of paper have different transport directions in the vertical direction and the horizontal direction, the contraction rate of the paper in the transport direction differs depending on the type of the paper.
When a copy original or print data is printed, the direction in which the image shrinks varies depending on the direction in which the paper contracts depending on the paper direction.

According to a fifth aspect of the present invention, when the same image data is printed on the paper in each transport direction so that the upper, lower, left, and right relations of the image are the same in the shorter length of the paper, the shrinkage of the paper is reduced. By adjusting the magnification using the magnification adjustment value for each combination of the paper direction and type, the reproducibility of the copy original and the magnification of the image data and the balance between the vertically conveyed paper and the horizontally conveyed paper The purpose is to make the printed image the same size.

For this reason, in the image forming apparatus according to the fifth embodiment, the resolution in the main scanning direction and the sub-scanning direction can be set independently, the magnification in the main scanning direction and the sub-scanning direction can be adjusted. In an image forming apparatus capable of performing printing in accordance with the resolution of the sub-scanning direction, a sub-scanning magnification adjustment value setting unit capable of adjusting the magnification in the sub-scanning direction at arbitrary intervals, and a main scanning set after setting the sub-scanning magnification adjustment value A main scanning magnification adjustment value setting unit capable of adjusting the magnification in the direction at arbitrary intervals, a paper feeding unit capable of feeding paper of the same size in a right angle direction, and determining the direction and type of the fed paper. Means and a magnification adjustment value setting means for sub-scanning and main scanning corresponding to a combination of the direction and type of paper.

The main scanning magnification adjustment value corresponding to the paper type is set and registered in advance. System controller 6
The application 30 transmits a print start command to the image input / output control device 632. The print start command includes
Image information such as image resolution, binary, multi-value selection, paper size, paper type, etc. is attached as a parameter.

In FIG. 11, the image writing unit 6
23 receives the print start request (step 110).
1) Compare the resolution set in the image writing unit 623 with the image resolution for which printing was requested, and determine whether there is a change in the writing resolution (step 1).
102). If there is a change in the writing resolution (step 1102 / Yes), the main scanning pixel clock is changed (step 1103). The main scan pixel clock is changed by the write clock generation circuit 203. Subsequently, the polygon cycle is changed (step 104). The polygon cycle is changed by the polygon motor control circuit 201.

Next, it is arbitrarily determined in advance whether the sheet can be conveyed in the selected size in both the vertical conveyance and the horizontal conveyance in the main scanning length and the sub-scanning length, or in units of paper size. Judgment is made from a code or the like (step 1105), and if the sheet can be transported in any direction (step 1105).
105 / Yes), since the direction in which the paper contracts differs depending on the paper type, a magnification adjustment value table in which magnification adjustment values in which the paper contraction direction is the same is registered is selected (step 110).
6) The second magnification adjustment value is selected from the magnification adjustment value table (step 1107), and the sub-scanning magnification adjustment and the main scanning magnification adjustment are performed using the selected second magnification adjustment value (step 110).
8).

If the sheet can be conveyed in only one direction (step 1105 / No), the sub-scanning magnification adjustment and the main scanning magnification adjustment are performed using the first magnification adjustment value (step 1109).
To adjust the sub-scanning magnification, the polygon cycle is determined by the polygon control circuit 2.
01 is changed. The main scanning magnification adjustment is performed by the write clock generation circuit 203. When the sub-scanning and the main scanning magnification adjustment are completed, parameters are set in the image writing device of the image writing unit 623 (step 1).
110). After the parameter setting is completed, image writing is enabled and image data is printed (step 1).
111), when the image writing is completed, the printing process of one image on the transfer paper is completed (step 1112).

According to the above description, the images printed on the vertical transport paper and the horizontal transport paper by the first magnification adjustment and the second magnification adjustment taking the contraction direction of the paper into consideration in advance are set to the horizontal transport paper 502.
And an image of the same magnification as the vertical transport paper 503. The original 505, the image data, and the print image 504 have the same magnification.

Next, the operation according to the sixth embodiment of the present invention will be described with reference to the flow chart shown in FIG. 12, in which the main scanning magnification adjustment value is automatically determined from the combination of the paper direction, paper type and paper size. The case of selecting and performing main scanning magnification adjustment control will be described. As described above, when the same size and the same type of paper have different transport directions in the vertical direction and the horizontal direction, the contraction rate of the paper in the transport direction differs depending on the type of the paper. When a copy original or print data is printed, the direction in which the image shrinks varies depending on the direction in which the paper contracts depending on the paper direction.

According to a sixth aspect of the present invention, when the same image data is printed on the paper in each transport direction so that the upper, lower, left, and right relations of the image are the same in the shorter length of the paper, the shrinkage of the paper is reduced. By adjusting the magnification with the magnification adjustment value for each combination of direction, type, and size of the original, the reproducibility of the copy original and the magnification of the image data, and the difference between the paper conveyed in the vertical direction and the paper conveyed in the horizontal direction The purpose is to make the printed image the same size.

For this reason, in the image forming apparatus according to the sixth embodiment, the resolution in the main scanning direction and the resolution in the sub-scanning direction can be set independently, the magnification in the main scanning direction and the sub-scanning direction can be adjusted, In an image forming apparatus capable of printing in accordance with the resolution, a sub-scanning magnification adjustment value setting unit capable of adjusting magnification in the sub-scanning direction at arbitrary intervals, and a main scanning direction set after setting the sub-scanning magnification adjustment value The main scanning magnification adjustment value setting means that can adjust the magnification in arbitrary increments, the paper feeding means that can feed paper of the same size in the right angle direction, and the direction, type and size of the fed paper There are provided means for determining, and means for setting a magnification adjustment value for sub-scanning and main scanning corresponding to a combination of the direction and type of paper and the size.

The main scanning magnification adjustment value corresponding to the combination of the paper size and the paper type is set and registered in advance. The application of the system controller 630 transmits a print start command to the image input / output control device 632. The print start command includes image resolution, binary, multi-value selection, paper size, paper type, and other image information as parameters.

In FIG. 12, the image writing unit 6
23 receives the print start request (step 120).
1) The resolution set in the image writing unit 623 is compared with the image resolution for which printing has been requested, and it is determined whether or not the writing resolution has been changed (step 1202). If there is a change in the writing resolution (step 1202 / Yes), the main scanning pixel clock is changed (step 1203). Main scan pixel clock change
This is performed by the write clock generation circuit 203. Subsequently, the polygon cycle is changed (step 1204). The polygon cycle is changed by the polygon motor control circuit 201.

Next, it is arbitrarily determined in advance whether the sheet can be conveyed in both the vertical conveyance and the horizontal conveyance in the selected size in the main scanning length and the sub-scanning length, or in units of paper size. Judging from the code or the like (step 1205), if the sheet can be conveyed in any direction (step 1205 / Yes), since the direction in which the sheet contracts differs depending on the type of sheet, the magnification in which the direction in which the sheet contracts is the same. An adjustment value table is selected (step 1206), and a second magnification adjustment value is further selected from the magnification adjustment value table by paper size (step 1207), and the sub-scanning magnification adjustment and the main scanning magnification are performed using the selected second magnification adjustment value. Adjustment (Step 120)
8).

If the sheet can be conveyed only in one direction (step 1205 / No), the sub-scanning magnification adjustment and the main scanning magnification adjustment are performed using the first magnification adjustment value (step 1209).
To adjust the sub-scanning magnification, the polygon cycle is determined by the polygon control circuit 2.
01 is changed. The main scanning magnification adjustment is performed by the write clock generation circuit 203. When the sub-scanning and the main scanning magnification adjustment are completed, parameters are set in the image writing device of the image writing unit 623 (step 1).
210). After the parameter setting is completed, image writing is enabled and image data is printed (step 1).
In step 211), the printing of one image on the transfer paper is completed when the image writing is completed (step 1212).

According to the above, the image printed on the vertical transport paper and the horizontal transport paper by the first magnification adjustment and the second magnification adjustment taking the contraction direction of the paper into consideration in advance, the horizontal transport paper 50
2 and the vertical transport paper 503 are images having the same magnification.
The original 505, the image data, and the print image 504 have the same magnification.

Next, the operation of the seventh embodiment according to the seventh aspect of the present invention will be described with reference to the flowchart of FIG. Will be described. As described above, when the same size and the same type of paper have different transport directions in the vertical direction and the horizontal direction, the contraction rate of the paper in the transport direction differs depending on the type of the paper. When a copy document or print data is printed, the direction in which the image shrinks varies depending on the direction in which the paper contracts depending on the paper direction.

According to a seventh aspect of the present invention, when the same image data is printed on the paper in each transport direction so that the upper, lower, left, and right relations of the image are the same in the shorter paper length, the printing is performed with respect to the contraction of the paper. By adjusting the magnification with the magnification adjustment value for each paper feed tray to which the paper is fed, the reproducibility of the magnification of the copy original and image data and the balance between the vertically conveyed paper and the horizontally conveyed paper The purpose is to make the printed image the same size.

For this reason, in the image forming apparatus according to the seventh embodiment, the resolution in the main scanning direction and the resolution in the sub-scanning direction can be set independently, the magnification in the main scanning direction and the sub-scanning direction can be adjusted. In an image forming apparatus capable of performing printing in accordance with the resolution of the sub-scanning direction, a sub-scanning magnification adjustment value setting unit capable of adjusting the magnification in the sub-scanning direction at arbitrary intervals, and a main scanning set after setting the sub-scanning magnification adjustment value Means for setting a main scanning magnification adjustment value in which the magnification in the direction can be adjusted in arbitrary increments; sheet feeding means capable of feeding sheets of the same size in a direction perpendicular to each other; and means for judging the fed sheet tray. There is provided a magnification adjustment value setting unit for sub-scanning and main scanning corresponding to the paper feed tray in which the fed paper is stored.

Each paper feed tray 3 containing printing paper
In 02, 303, 304, and 305, a combination of the corresponding sub-scanning magnification adjustment value and main scanning magnification adjustment value is set and registered in advance. The application of the system controller 630 transmits a print start command to the image input / output control device 632. The print start command includes, as parameters, image information such as image resolution, binary, multi-value selection, paper size, and the number of a tray in which paper is stored.

Upon receiving the print start request (step 1300), the image writing unit 623 compares the resolution set inside the image writing unit 623 with the image resolution for which the print start request was made, and there is no change in the writing resolution. Is determined (step 1301). If the writing resolution is changed (step 1301 / Ye
s), change the main scanning pixel clock (step 130)
2). The main scan pixel clock is changed by the write clock generation circuit 203. Subsequently, the polygon cycle is changed (step 1303). The polygon cycle is changed by the polygon motor control circuit 201.

Next, the sub-scanning magnification adjustment value and the main-scanning magnification adjustment value corresponding to the paper feed tray in which the paper is stored are selected (step 1304), and the selected sub-scanning magnification adjustment value and The magnification is adjusted with the main scanning magnification adjustment value (step 1305). The sub-scanning magnification adjustment is performed by changing the polygon cycle by the polygon control circuit 201. The main scanning magnification adjustment is performed by the write clock generation circuit 203. When the sub-scanning and the main scanning magnification adjustment are completed, parameters are set in the image writing device of the image writing unit 623 (step 1306). After the parameter setting is completed, image writing is enabled, and image data is printed (step 1307). When the image writing is completed, printing of one image on one transfer sheet is completed (step 1308).

According to the above, the images printed on the vertical transport paper and the horizontal transport paper can be adjusted by the optimal magnification adjustment of the contraction direction and the contraction ratio according to the type and size of the paper stored in the paper feed tray. The images have the same magnification as the horizontal transport paper 502 and the vertical transport paper 503. The original 505, the image data, and the print image 504 have the same magnification.

[0074]

According to the first aspect of the present invention, when the same size and the same type of paper are transported in different vertical and horizontal directions, the same image data is printed on the paper in each transport direction. Also, by adjusting the magnification in the sub-scanning direction and the main scanning direction according to the shrinkage of the paper, the magnification of the printed image of the paper conveyed in the vertical direction and the paper conveyed in the horizontal direction can be reduced by the minimum increment of the magnification adjustment. The effect is almost the same in units. Further, there is an effect that the magnifications of the copy original, the copy image, the print data, and the print image become substantially the same in the minimum unit of magnification adjustment.

According to the second aspect of the present invention, when the sub-scanning magnification adjustment is performed, the main-scanning magnification adjustment is affected. Therefore, the main-scanning magnification adjustment is performed without performing the sub-scanning magnification adjustment. If the adjustment is made, correct magnification adjustment will not be performed, but by setting the main scanning magnification adjustment value without setting the sub-scanning magnification adjustment value, incorrect magnification adjustment will be performed, and image printing with the wrong magnification will be suppressed. effective.

According to the third aspect of the invention, the adjustment of the sub-scanning magnification affects the adjustment of the main-scanning magnification. Therefore, the main-scanning magnification is adjusted without adjusting the sub-scanning magnification, and then the sub-scanning magnification is adjusted. When the adjustment is performed, the correct magnification adjustment is not performed.However, the sub scanning magnification adjustment value is set by setting a warning so that the main scanning magnification adjustment value is not set without setting the sub scanning magnification adjustment value. The main scanning magnification adjustment value is set from the above, and there is an effect that correct magnification adjustment is performed. In addition, it is possible to warn that the magnification is not correct for the image printing ignoring the magnification, but to enable the printing, there is an effect that the printing process is not stopped and the productivity is not reduced.

According to the fourth aspect of the invention, in order to obtain the effect of the first aspect of the invention, it is necessary to perform the first magnification adjustment and the second magnification adjustment, and only to set the first magnification adjustment value. If the second magnification adjustment value is not set, the effect of claim 1 cannot be obtained. However, by selecting the first magnification adjustment value, the image printed regardless of the paper orientation, type, and size can be obtained. The effect of suppressing a magnification error such as a lens attachment error and a rotation speed error of the photosensitive drum inherent to the image forming apparatus included in all of the above is obtained.

According to the fifth aspect of the invention, by setting the magnification adjustment value for each combination of the paper direction and the paper type,
The magnification of the sub-scanning magnification and the main scanning can be adjusted for each sheet fed, and the effect of automatically adjusting the magnification corresponding to the difference between the contraction direction and the contraction ratio depending on the paper direction and the type of paper is provided. .

According to the sixth aspect of the present invention, the magnification adjustment value is set for each combination of the paper direction, the paper type, and the paper size, so that the magnification adjustment between the sub-scanning and the main scanning for each fed paper can be performed. It is possible to perform the magnification adjustment automatically corresponding to the difference in the contraction direction and the contraction rate between the paper direction, the paper type, and the paper size.

According to the seventh aspect of the invention, when the paper size and the paper type of the paper feed tray storing the print paper are fixed, the sub-scanning magnification adjustment for each paper feed tray storing the paper is performed. By setting the value and the main scanning magnification adjustment value,
The magnification of the sub-scan and the main scan can be adjusted for each sheet stored in each paper feed tray, and with a small amount of adjustment data, the difference in the contraction direction and contraction ratio can be automatically determined for the paper direction, paper size, and paper type. There is an effect of performing a magnification adjustment corresponding to the situation.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a beam scanning device in an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an image writing unit control plate in the image forming apparatus according to the embodiment of the present invention.

FIG. 3 is an external view of a digital copying machine as an image forming apparatus according to the embodiment of the present invention.

FIG. 4 is a configuration diagram illustrating an example of a case where sheets of the same type of the same size are shortened due to a difference in a conveyance direction and a case where the sheet length is not contracted.

FIG. 5 illustrates an embodiment in which image magnification is adjusted by performing magnification adjustment when a paper length of the same type of paper of the same size is shortened due to a difference in a conveyance direction, and in which magnification adjustment is performed on a document. FIG. 2 is a configuration diagram showing an embodiment in which the magnification of a copied image is adjusted.

FIG. 6 is a block diagram illustrating a configuration of an image input / output control device.

FIG. 7 is a flowchart showing an operation according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing an operation according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing an operation according to the third embodiment of the present invention.

FIG. 10 is a flowchart showing an operation according to a fourth embodiment of the present invention.

FIG. 11 is a flowchart showing an operation according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart showing an operation according to a sixth embodiment of the present invention.

FIG. 13 is a flowchart showing an operation according to the seventh embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 101 Polygon mirror 104 Synchronization detection lens 106 Photoconductor drum 108 Semiconductor laser 109, 208 Image writing unit control board 200, 605, 617, 625 CPU 300 Document reading unit 301 System operation panel 302 Printing paper first paper feed tray 303 Printing paper 2 paper feed tray 304 print paper 3rd paper feed tray 305 print paper 4th paper feed tray 400 before fixing of vertically conveyed print paper 401 example of shrinking of vertically conveyed print paper after fixing 402 before fixing of horizontally conveyed print paper 403 An example in which the horizontally transported printing paper does not shrink after fixing 500 An example of output of the vertically transported printing paper by the first magnification adjustment 501 An example of an output of the horizontally transported printing paper by the first magnification adjustment 502 The second example of the vertically transported printing paper Example of output by 2 magnification adjustment 503 1 Example of output by magnification adjustment 504 Example of a copied image in which no shrinkage occurs due to magnification adjustment 505 Original 506 Example of a copied image shrunk in the sub-scanning direction due to no magnification adjustment 600 System controller 602 NVRAM 614 Input device 615 Display device 616 ROM 631 Operation panel control device 632 Image input / output control device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65H 1/00 B65H 1/00 501B 5C072 501C 5C076 1/26 312 1/26 312K 7/06 7/06 G03G 21/00 370 G03G 21/00 370 386 386 H04N 1/04 H04N 1/17 B 1/17 1/04 CF term (reference) 2C061 AP03 AP04 AP07 AQ06 CQ34 CQ41 HK07 HL01 HL02 HN19 HV32 2C087 AA03 AA09 AA18 AC08 BD06 DA11 2H027 DC02 DC19 DC20 DE07 ED04 EE07 EH10 EK03 FA05 FA06 FA31 FB07 FB12 FB19 FD02 FD08 GB07 GB18 ZA07 3F048 AA02 AA04 AA05 AB01 BA07 BA19 BB04 CA03 CB03 DA01 EA15 EB02 3A03 A03 A03A03 A02FB03 BB31 CB05

Claims (7)

[Claims] 1. A setting means for setting a first sub-scanning magnification adjustment value for adjusting a magnification in the sub-scanning direction, and a first main scanning for adjusting a magnification in the main scanning direction after setting the first sub-scanning magnification adjustment value. Setting means for setting a magnification adjustment value; setting means for setting a second sub-scanning magnification adjustment value for performing magnification adjustment in the sub-scanning direction; and setting the magnification in the main scanning direction after setting the second sub-scanning magnification adjustment value. Setting means for setting a second main scanning magnification adjustment value to be performed; and a combination of the first main scanning magnification adjustment value and the first sub-scanning magnification adjustment value as a first magnification. A magnification adjusting means for selecting the first magnification or the second magnification in accordance with the paper transport direction, and adjusting the magnification in the sub-scanning direction and the main scanning direction; An image forming apparatus comprising: 2. A display means for displaying a setting state of the first magnification or the second magnification, wherein the first main scanning magnification adjustment value cannot be set without setting the first sub-scanning magnification adjustment value. Setting prohibiting means for preventing the setting of the second main scanning magnification adjustment value without setting the second sub-scanning magnification adjustment value, and prohibiting printing if the first magnification or the second magnification is not set. The image forming apparatus according to claim 1, further comprising a unit. 3. The first main scanning magnification adjustment value is set without setting the first sub scanning magnification adjustment value, or the second main scanning magnification is set without setting the second sub scanning magnification adjustment value. A warning means for giving a warning when an adjustment value is set, and a warning means for giving a warning when printing is performed without setting either the first magnification or the second magnification. Item 2. The image forming apparatus according to Item 1. 4. An image according to claim 1, further comprising a print control unit for performing printing with only said first magnification when said first magnification is set and said second magnification is not set. Forming equipment. 5. Registering means for registering a sub-scanning magnification adjustment value for adjusting the magnification in the sub-scanning direction and a main scanning magnification adjustment value for adjusting the magnification in the main scanning direction in accordance with a combination of the direction and type of paper. Paper feeding means capable of feeding paper of the same size in a predetermined direction and in a direction perpendicular to the predetermined direction; determining means for determining the direction and type of the fed paper; Setting means for selecting and setting the sub-scanning magnification adjustment value corresponding to the combination of the direction and type from the registration means; and setting the sub-scanning magnification adjustment value, and setting the discriminated direction and type of the sheet. Setting means for selecting and setting the main scanning magnification adjustment value corresponding to the combination from the registration means. 6. A registration means for registering a sub-scanning magnification adjustment value for adjusting a magnification in the sub-scanning direction and a main scanning magnification adjustment value for adjusting a magnification in the main scanning direction in accordance with a combination of the direction, type, and size of a sheet. Paper feeding means capable of feeding paper of the same size in a predetermined direction and in a direction perpendicular to the predetermined direction; determining means for determining the direction, type, and size of the fed paper; Setting means for selecting and setting the sub-scanning magnification adjustment value corresponding to the combination of the direction, type, and size of the paper from the registration means; and setting the sub-scanning magnification adjustment value, and then setting the discriminated paper direction. An image forming apparatus comprising: setting means for selecting and setting the main scanning magnification adjustment value corresponding to the combination of type and size from the registration means. 7. A plurality of paper feeders for feeding paper such that each of the papers has a different direction, type, and size, and a sub-scanner for adjusting a magnification in a sub-scanning direction corresponding to each paper feeder. A registration unit that registers a magnification adjustment value and a main scanning magnification adjustment value that performs magnification adjustment in the main scanning direction; a determination unit that determines a paper supply unit of the fed paper; and a storage unit that corresponds to the determined paper supply unit. Setting means for selecting and setting the sub-scanning magnification adjustment value from the registration means; and setting the main-scanning magnification adjustment value corresponding to the determined sheet feeding means after setting the sub-scanning magnification adjustment value. An image forming apparatus provided with setting means for selecting and setting from among the means.