JPS6255639A - Image forming device - Google Patents

Abstract

PURPOSE:To instruct an image forming range even if a set reference of an original is changed, and to prevent an image forming mistake by providing a varying means which can move along the set reference of the original and varies an image forming position of an image to an image carrying body, a setting means for setting the set reference of the original to the center or one side of an original platen, and a control means. CONSTITUTION:When a set reference setting key 30a of an original of an operating panel 30 is operated, a set reference of the original is set to the center of a fixed scale 2x. In case a copying magnification is unmagnification or a reducing magnification is set, etc., the center of an original G and the center of a form P which is supplied coincide with each other, therefore, a variable power use lens block 8 is moved in the direction (y) in accordance with a copying magnification which has been set, but it is not moved in the direction (x). Also, in this case, a scale 53 is moved in accordance with a size of a form cassette which has been selected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

(Technical Background of the Invention and Problems Therewith) As is well known, some electronic copying machines have a document setting reference point at the center of the document table, and others have a document setting standard on one side of the document table. Since the setting standards for these originals are fixed by the copying machine, it is fine if the user uses a copying machine with which the setting standards are familiar, but if not, it may be difficult to use because the setting standards are different from normal ones. There is,
In some cases, there is a problem in that a copying error occurs, such as an image being formed only on a portion of the paper.

(Purpose of the Invention) This invention was made in view of the above circumstances, and its purpose is to be able to perform 1~ of manuscripts according to familiar standards, and to change the setting standards for ljk drafts. It is therefore an object of the present invention to provide an image forming apparatus which can specify an image forming range in accordance with this and can prevent image forming errors.

[Summary of the Invention] This invention allows, for example, a lens block for variable magnification to be used to set a document! ! By making it movable along a standard fixed scale, and by making the image formed on the paper fed with the center standard movable, the user can select the document setting standard as required; In addition, by moving the movable scale provided at the bottom of the document table, when the setting standard is in the center, the image forming range is specified using the first fixed scale and the moving scale, and when the setting standard is on one side, the above-mentioned moving scale is specified. The image forming area is moved to an invisible position and the image forming range is indicated using only the second fixed scale.

[Embodiments of the invention]

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

FIGS. 4 and 5 schematically show an image forming apparatus of the present invention, such as a compound machine. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. The document table 2 has first and second fixed scales 2
V, and a fixed scale 2Z (the fixed scale 2X is for the center reference, and the fixed scales 2y and 2z are for one side reference), and furthermore, a document cover 11 and a work table 12 which can be opened and closed are provided near the document table 2. It is provided. The original placed on the original table 2 is exposed to an exposure lamp 4.
, mirrors 5, 6, and 7 reciprocate along the lower surface of the document table 2 in the direction of arrow a, so that exposure scanning is performed during the reciprocation. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5.6.7, passes through the variable magnification lens block 8, and then passes through the mirror. 9 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by a charging device 11, and then the image is exposed to slit light, thereby forming a static N latent image on the surface. This electrostatic latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery roller 15 or 16, passes through the paper guide path 17 or 18, and then passes through the registration roller. versus 19
and is guided to the transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later. Note that the cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 601 and 602, respectively. This cassette size detection switch 601.
602 is turned on depending on the insertion of a cassette of a different size.
It consists of multiple microswitches that are turned off.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. . This transferred paper P is transferred to the peeling charger 2
1, the image is electrostatically peeled off from the photoreceptor drum 10 and conveyed by a conveyor belt 22, and is sent to a fixing roller 23 as a fixing device provided at the end of the conveyor belt 22, where the transferred image is transferred. It will be established. Then, paper P after fixing
is arranged to be placed on a tray 25 outside the main body 1 by a pair of paper ejection rollers 24. After the photosensitive drum 10 has been transferred, the charge is removed by the charger 26, residual toner on the surface is removed by the cleaner 27, and the afterimage is erased by the snow removal lamp 28, so that the drum 10 returns to its initial state. It looks like this. Note that two cooling fans are used to prevent the temperature inside the main body 1 from rising.

FIG. 6 shows the operation panel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
is a numeric keypad for setting the number of copies, etc., 303 is a display unit that displays the operating status of each part and paper jams, etc., 304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14, and 30s is the selected cassette. 30s is a magnification setting key for setting the magnification and reduction magnification of the copy in a predetermined relationship, 307 is a zoom key for steplessly setting the magnification and reduction magnification, and 30++ is a display for displaying the set magnification. A section 309 is a density setting section for setting copy density. 30a is a document setting standard setting key for specifying left copy 1, that is, center reference; 30b is a document setting standard setting key for specifying right copy 1, that is, one side reference;
c and 30d are set standard setting keys 30a and 30, respectively.
b is a light-emitting display element indicating that it has been operated.

FIG. 7 shows an example of the drive source configuration of each drive unit of the copy line configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 that performs magnification change. 32 is a mirror motor, which is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification. 33 is a scanning motor, which connects the exposure lamp 4 and mirror 5;
This is a motor for moving the mirror 6.7 for scanning the original. A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming.

A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like.

36 is a drum motor, which is a motor for driving the photosensitive drum 10. Reference numeral 37 denotes a fixing motor, which is a motor for driving the paper conveyance path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24. 38 is a paper feeding motor, which is a motor for driving the delivery rollers 15 and 16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19.

A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 8 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 422, and these carriages 411.412 are guided by guide rails 421.422 in the direction of arrow a. It can be moved in parallel. That is, the four-phase pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and one end of a first carriage 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, a second carriage 422 supporting the mirror 6.7
The guide portion 46 includes two grooves spaced apart in the axial direction of the rail 422.
Two pulleys 47.47 are rotatably provided, and a wire 48 is stretched between these pulleys 47.47. One end of this wire 48 is fixed to a fixing part 49, and the other end is fixed to the fixing part 49 via a coil spring 50. Further, one end of a first carriage 41 is fixed to the middle part of the wire 48. therefore,
As the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, pulley 4
7. Since 47 acts as a movable pulley, the first carriage 4
1! In contrast, the second carriage 422 moves in the same direction at 1/2 the speed. Note that the first and second carriages 41
The moving direction of 1.412 is controlled by switching the rotation direction of the pulse motor 33.

Further, the first carriage 411 is moved to a predetermined position by driving the motor 33 according to the paper size and magnification.
(home position according to the magnification). Then, when the copy key 301 is pressed, the first
The carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411
is returned to the home position.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. In other words, cassette selection key 3
If the paper size specified by 04 is (Px, Py) and the copy magnification specified by the magnification setting keys 306 and 307 is K, then the copyable range (x, y), rx-
Px/KJ.

ry-Py/Kl. This copyable range (X, y)
As shown in FIG. 1, the X direction corresponding to the set reference center is indicated by a fixed scale plate 2x provided at the left end of the document table 2, and the Y direction is indicated by the upper surface of the first carriage 411. Scale installed in (moving scale)
As shown in FIG. It is displayed by a fixed scale plate 2z provided in the.

As shown in FIG. 9, the above-mentioned pointers 51 and 52
．． The wire 57 is provided with a spring 56 suspended between the wire 55 and the wire 55 . The pulley 55 is connected to the motor 58
This motor 58
The distance between the hands 51 and 52 can be changed by rotating the hands according to the paper size and magnification.

FIG. 10 shows a drive mechanism for the variable magnification lens block 8. As shown in FIG. The motor 31 is a W41 carriage 41
A lead screw 61 arranged along the moving direction (y direction) of the village is rotated. Bushes 631 and 632 provided at one end of the substrate 62 are screwed into this lead screw 61, and when the lead screw 61 is rotated, the substrate 62 is moved in the y direction.

A guide member 621 is provided at the other end of the substrate 62, and the guide member 621 is slidably engaged with the guide rail 64. Further, the substrate 62 includes a substrate 62 .
A movable body 65 is provided, which is movable in a direction (X direction) orthogonal to the above, and to which the variable magnification lens block 8 is attached. That is, supports 651. are provided at both ends of the moving body 65.
652 is provided, and this support 65s, 652
are guided and held by guide members 66r and 662 provided on the substrate 62. Further, a rack 653 is provided on the longitudinal side surface of the support body 651, and a pinion 68 rotated by a pulse motor 67 provided on the base plate 62 is meshed with this rack 653. Therefore, the lens block 8 for variable magnification is controlled by the motor 6.
7 is driven, it is moved in the X direction. In addition,
Microswitches 691 and 692 detect the initial positions of the substrate 62 and the moving body 65, respectively.

Next, the relationship between the operation of the variable magnification lens block 8 and the image formed will be explained. In Section 111(a):
The focal length of the variable magnification lens block 8 is f, and the document table 2
The optical path length from the magnification variable lens block 8 to the photoreceptor drum 10 is yb, and the total optical path length from the document table 2 to the photoreceptor drum 10 is yc. The formula is expressed as follows.

1 / f = 1 / y a + 1, / y
b Also, the magnification is expressed as yb/ya. Since the focal length f of the variable power lens block 8 is constant, it is understood that in order to focus during variable power, it is necessary not only to change the total optical path length yc but also to change ya or yb. This yalyb can be changed by moving the variable power lens block 8 in the y direction. Further, the total optical path length yc can be changed by moving the second carriage 412 and changing the position of the mirror 6.7.

On the other hand, as shown in FIG. 11(b), the distances between the document table 2, the variable magnification lens block 8, and the photosensitive drum 10 are kept constant, and the variable magnification lens block 8 is moved by the motor 67 in the X direction, for example, by a distance. When moving by ×1, the photosensitive drum 10
The upper image is moved by a distance x 2 given by the following equation.

'X2-Xixyb/ya Also, in the case of equal size copying, X2 = 2X1. In this way, by moving the variable magnification lens block 8 in the X direction, the center of the copied image can be moved.

FIG. 12 shows the overall control circuit, showing the main processor group 71 and the first . Second sub-processor group 72.
It is mainly composed of 73. The main processor group 7
Reference numeral 1 denotes a high-voltage transformer 76 that detects input from an input device 75 such as an operation panel 30 and various switches and sensors, such as the cassette size detection switch 601 and 602, and drives the various chargers, the static elimination lamp 28, and the The blade solenoid 27a of the cleaner 27, the heater 23a of the pair of fixing rollers 23, the exposure lamp 4, and each of the motors 31 to 40 are controlled to perform the copying operation, and the motor 58 is controlled to perform copying. Perform the movement movement of the guideline 51 and 52 corresponding to the possible range,
The motor 67 is controlled to move the original image in accordance with the original setting criteria described later.

Among the motors 31 to 40.67, motor 35.37
．． A toner motor 77 that supplies toner to the developer 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78, and the motors 31 to 34 and 67 are controlled by the first sub processor group via a pulse motor driver 79. The motors 36, 39, 38, 58 are controlled by the second sub-processor group 73 via a pulse motor driver 80. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control plate section 82. From the main processor group 71 to the first and second sub-processor groups 72 and 73,
Commands to drive and stop each motor are sent to the first motor. From the second sub-O setter group 72 and 73 to the main processor group 71
A status signal indicating the drive/stop state of each motor is sent to the motor. Further, the first sub-processor group 72 receives position information from a position sensor 83 that detects the initial positions of the motors 31 to 34.67.

FIG. 13 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Further, the microcomputer 91 is expanded by input/output ports 93-96. A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93. A size switch for detecting paper size and other inputs are connected to the input/output boat 94. A copy condition setting switch and other inputs are connected to 95.

Note that the input/output port 96 is an option.

FIG. 14 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71.

102 is a programmable interface and pulse timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 01, counting is performed based on the set value, and when the count is completed, an end pulse is output to the interrupt line of the microcomputer 101. A reference clock pulse is input to the timer 102. Further, the microcomputer 101 receives position information from the position sensor 83, and also inputs the input/output boat 103.10.
4 is connected. And the input/output board 104
The motor 3 is connected to the motor 3 via the pulse motor driver 79.
1 to 34.67 are connected. The input/output board 103 is used, for example, to output status signals of each pulse motor to the main processor group 71.

FIG. 15 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71.

112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 1, it counts based on it, and outputs an end pulse when the count is out. This termination pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output board input line of the microcomputer 111. Further, an input/output boat 114 is connected to the microcomputer 111, and motors 36, 38, 39, and 58 are connected to the input/output boat 114 via the pulse motor driver 80.

Figure 16 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in FIGS. 13 and 15) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 12) is connected to the pulse motor driver 122, and the pulse motor 123 (the pulse motor 31 to 34.
．． 38.39.58.67) windings A, B, A
, B are connected.

Figure 17 shows a method for controlling the speed of a pulse motor.

Figure 1 (a) is the speed curve of the pulse motor;
b) shows the phase switching interval. As is clear from this figure, the phase switching interval is initially long, gradually shortens, eventually becomes equal, then gradually increases again until it stops. In other words, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. Note that t, , t2
...tx indicates the time of the phase switching interval.

Next, the gist of the invention will be explained.

In this invention, the reference for setting the original is the center of the fixed scale 2X on the left side of the document table 2, or the fixed scale 2X on the right side.
The paper can be selected using the setting keys 3a and 3b such as one side of y, and the paper is placed on the fixed scale 2X of the manuscript table 2.
It is designed to be supplied with reference to the center of the area.

FIG. 18 shows the paper supply section described above.

In this manner, when the paper setting reference corresponds to the center of the document table 2, the delivery rollers 15 and 16 are configured to come into contact with the center of the paper. Therefore, when taking out the paper from the cassette, there is no so-called skew in the paper, so that paper can be fed satisfactorily. On the other hand, when the paper is fed from one side, the delivery roller does not come into contact with the center of the paper, so that the paper taken out from the cassette is likely to be skewed when the paper is fed.

In the above configuration, the operation will be explained. When the document setting standard setting key 30a of the operation panel 30 is operated, the document setting standard is set to the center of the fixed scale 2x. In this case, if the copying magnification is set to the same magnification as shown in FIG. 1(a), or if the reduced magnification is set as shown in FIG. 1(b), Since the centers of the sheets of paper P coincide with each other, the variable magnification lens block 8 adjusts the magnification as shown in FIG.
It is moved in the y direction shown in , but not in the x direction.

Furthermore, in this case, the scale 53 is moved according to the size of the selected paper cassette. That is, when the upper cassette in which A4 size paper is set is selected, the main processor group 71 uses the microcomputer 101 to drive the motor 33 to move the scale 53.
is set at a position with a width corresponding to the position based on the center of the fixed scale 2x.

On the other hand, in the above state, when the document setting standard setting key 30b is operated, the document setting standard is set to the fixed scale 21.27. In this case, Fig. 1(c) (
As shown in d), even if the copying magnification is equal to or reduced, the center of the document and the center of the paper P do not coincide. For this reason, the variable power lens block 8 is connected to the magnification setting key 3.
It is moved in the X direction and the Y direction according to the copy magnification set by 0s and the paper size selected by the cassette selection key 304.

That is, the movement of the variable magnification lens block 8! l1m is obtained as follows. As shown in FIG. 2, the distance from the center of the document table 2 to one end of the fixed scale 2y is x'
l, the length from the center of paper P to one end is X2 (=
P/2>, the moving distance of the variable magnification lens block 8 according to the set magnification is y, the variable magnification lens block 8 at the same magnification (shown by a solid line), and the variable magnification lens at a predetermined copying magnification. The angle between the line connecting the centers of the blocks 8 (indicated by dotted lines) and the optical axis of the variable power lens block 8 shown by the solid line is θ, and the variable power lens block 8, document table 2, and paper shown by the dotted lines are θ. Letting the distances to P be a and b, respectively, the relationship between these is (XO+X2)/(a+b)-(x2+Ytanθ)/b The focal length 11f of the variable power lens block 8 is 1/a+1
/b-1/f The magnification ratio is K-b/a. Solving the above equation reveals that it is expressed by the following relationship: x-1: (K, XO, f, P). Here, Xll
, f are constants determined by the copying machine, so the above equation can be transformed into x-F(K,P). That is, it can be seen that the moving distance X of the variable magnification lens block 8 along the fixed scale 2y is determined by the variable magnification ratio and the paper size. In other words, once the magnification ratio and paper size are set, the amount of movement of the magnification changing lens block 8 can be determined. In order to move the variable magnification lens block 8, the number of pulses corresponding to If so, the stored number of pulses may be read out in accordance with this input information, and the motor 67 may be driven in accordance with this number of pulses.

Further, in this case, the scale 53 is moved to a lower part of the fixed scale 2x, that is, to a position where the operator cannot see it visually.

That is, the main processor group 71 uses the microcomputer 101 to drive the motor 33, so that the main processor group 71 operates as shown in FIG.
Alternatively, as shown in (d), the scale 53 is set below the fixed scale 2X.

FIG. 3 shows the operating state of the variable magnification lens block 8 according to the document set position, copy magnification, and paper size. The figure (a> shows the case where original G with width G2 is set as the center reference and a same size copy is made on paper P with width P2.

In the same figure (b), original G with width 03 is used as one side reference, and width is P.
This shows the case of copying at the same size on No. 3 paper P. FIG. 2C shows a case where an original G having a width of G4 is used as a reference on one side and an enlarged copy is made onto a sheet P having a width of P4. The same figure (d
> indicates a case where an original G having a width of Gs is used as a one-sided reference and an enlarged copy is made onto a sheet P having a width of P5.

According to the embodiment described above, setting reference setting keys 30a and 30b for specifying the document setting position are provided, so that the user can specify the document setting position as required. Also,
When the document is set at the center, the fixed scale 2× and the scale 53 indicate the copy range, and when the document is set at one side, the fixed scales 2y and 2Z indicate the copy range. Therefore, it is possible to perform copying at a familiar original setting position, and also to set the original in accordance with instructions on the scale, so it is possible to prevent copying errors due to incorrect setting of the original.

Further, the variable magnification lens block 8 is made movable in accordance with the operation of the document setting standard setting keys 30a, 30b, the magnification setting key 30s, and the cassette selection key 304, so that the image is always formed in the center of the paper. There is. Therefore, even if the document setting standard changes, it is possible to send out the paper with the center standard, and there is no need to replace the cassette.

Furthermore, the setting reference for the paper P corresponds to the center of the fixed scale 2x, and the delivery rollers 15, 16 are arranged to contact the center of the paper.

Therefore, the supplied paper is unlikely to be skewed, and the reliability of paper feeding is high.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without changing the gist.

(Effects of the Invention) As described in detail above, according to the present invention, it is possible to set the original according to familiar standards, and even if the original setting standard changes, the image forming range can be specified accordingly. , it is possible to provide an image forming apparatus that can prevent copying errors.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the image forming apparatus according to the present invention, and FIG. 2 is a partially cutaway plan view of only the main part showing the position where a document is set, and FIG. 2 is a plan view for explaining the moving state of the lens. 3 is a schematic configuration diagram shown to explain the movement state of the lens in various setting states, FIGS. 4 and 5 show the configuration of the image forming apparatus,
Fig. 4 is an external perspective view, Fig. 5 is a side sectional view, Fig. 6 is a plan view showing the configuration of the operation panel, Fig. 7 is a perspective view showing the configuration of the drive section, and Fig. 8 is the drive of the optical system. FIG. 9 is a perspective view schematically showing the mechanism, FIG. 9 is a perspective view schematically showing the drive mechanism for the upper pointer, and FIG. FIG. 11 is a perspective view showing only the magnification changing lens block, and FIG.
Fig. 2 is a block diagram showing the overall control circuit, Fig. 13 is a block diagram of the main processor group, Fig. 14 is a block diagram of the first sub-processor group, and Fig. 15 is a detailed block diagram of the second sub-processor. , FIG. 16 is a schematic configuration diagram showing the control circuit of the pulse motor, FIG. 17 is a diagram for explaining the speed control method of the pulse motor, and FIG. 18 is a perspective view of the main parts showing the paper feeding section. . 1...Main body, 2...Original table, 2x, 2V, 2Z...
・Fixed scale, 8... Lens block for variable magnification, 1o
...Photosensitive drum, 30...Operation panel, 30a
, 30b... Set standard setting key, 53... Scale, 58... Motor, 71... Main processor group. Applicant's representative Patent attorney Takehiko Suzue Figure 2 (a) Figure 3 <1)) Third cause (C) Figure 3 (d) Figure 3 1H4III

Claims (2)

[Claims] (1) a scanning means that moves along a document table and optically scans a document placed on the document table according to a setting standard;
an image carrier on which an image corresponding to the original image guided by the scanning means is formed; a supply means for supplying a transfer material in correspondence with the set reference center of the original; In the image forming apparatus, the image forming apparatus includes a transfer means for transferring an image formed on the image carrier, a first image forming area provided at one end of the document table for indicating a vertical image forming range corresponding to a reference center of document setting. a fixed scale; a second fixed scale that indicates a vertical image forming range corresponding to one side of the document setting reference provided at the other end of the document table; and a second fixed scale that is movable along the document setting reference and carries an image. a changing means for changing the imaging position of the image relative to the body, a setting means for setting the document setting reference to the center or one side of the document table, and operating the changing means according to the settings of the setting means, and 1. An image forming apparatus comprising: a control means for moving a moving scale provided at a lower part of a table and indicating a horizontal image forming range with respect to an original image. (2) If the setting by the setting means is set to the center of the set reference, move the moving scale to a position that indicates the image forming range in the lateral direction with respect to the original image, and set the image forming range using the first fixed scale and the moving scale. If the set reference is on one side, move the moving scale to an invisible position,
2. The image forming apparatus according to claim 1, wherein the image forming range is indicated using only the second fixed scale.