JPS60123834A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent an error in copying such as the partial absence of an original by providing a means which displays a possible image formation range on a platen on the basis of set magnification and detected recording medium size. CONSTITUTION:A possible copy range is calculated by the processor in a copying machine from the set magnification and selected cassette side. A scale 62 on which the possible copy range calculated from the length in a form feed direction and copy magnification is indicated and indicators 161 and 162 which indicate the possible copy range calculated from the length in the form width direction and copy magnification are driven on the basis of said arithmetic result. Consequently, the possible copy range is displayed on the platen 2 and a user judges the possible copy range from a hatched part (l1Xl2) immediately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus capable of displaying, for example, a copyable area.

[Technical background of the invention and its problems]

2. Description of the Related Art For example, in a copying machine, a scale for displaying the placement position of a document on a document table, a light emitting element for indicating the size of the document, and the like are disposed on a document table. However, these only display the placement position of the original, and the range that can be copied is unclear. For this reason, when copying is performed using the reduction or enlargement function, a copying error occurs in which a portion of the document is omitted, resulting in the inconvenience of wasting paper.

[Purpose of the Invention] This invention has been made based on the above circumstances, and its purpose is to provide an image forming apparatus that can confirm the image forming range and reduce image forming errors. That is.

[Summary of the invention]

This invention is configured so that an image-formable range can be displayed on the document table.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows an image forming apparatus, such as a copying machine, according to the present invention. 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 original set on the original platen 2 is exposed to an exposure lamp 4 and mirrors 5, 6.7.
By reciprocating the optical system 3 in the direction of arrow a along the lower surface of the document table 2, exposure scanning is performed during the reciprocation. In this case, mirror 6.7 moves at a speed of 172 of mirror 5 so as to keep the optical path length constant. 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 lander 4, is reflected by the mirrors 5, 6.7, and then passes through the variable magnification lens 8. Further, the image of the document is reflected by the mirror 9 and guided to the photoreceptor drum 10.
The image is formed on the 00 surface. Above optical system 3
The home position is located near the fulcrum 52, which will be described later.
It is located at the right end of the drawing.

The photosensitive drum 10 rotates in the direction of arrow C, and the surface of the photosensitive drum 10 is first charged by the charging device 1, and then the original image is exposed to light to form an electrostatic latent image. 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 feed roller 15 or 16, passes through the paper guide path 17 or 18, and then passes through the registration roller. The paper is guided to a pair of rollers 19 and sent to a transfer section by this pair of rollers 19. Here, each of the above paper feed cassettes 13°14
is removably provided at the lower right end of the main body 1,
(Operation not shown) Either one can be selected in the mother channel. In addition, each of the above paper feed cassettes 1
3.14n each cassette size detection switch 301
．． 30. To? The cassette size is detected.

These detection switches 301, 30. is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

Thus, the paper P sent to the transfer section is transferred to the transfer charger 2.
By coming into close contact with the surface of the photoreceptor drum 10 at the 00 portion, the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20 .

The transferred paper P is peeled off from the photosensitive drum 10 by the action of the peeling charger 21, is conveyed by the conveyor belt 22), and is sent to a pair of fixing rollers 23 as a fixing device provided at the end thereof. The transferred image is fixed by passing through this area.

After fixing, the paper P is discharged to the outside of the main body 1 by a pair of paper discharge rollers 24. Further, after the photosensitive drum 10 has been transferred, residual toner on the surface of the photosensitive drum 10 is removed by a cleaner 27, and any residual image is removed by a static eliminating land 28, so that the photosensitive drum 10 returns to its initial state. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

゛A paper transport path 51 is formed here by the pair of registration rollers 19, the transport belt 22, the pair of paper discharge rollers 24, and a guide plate (not shown) appropriately arranged between these. A photosensitive drum 10 and a transfer charger 20 are arranged at the end, and the pair of fixing rollers 23 is arranged at the terminal end.

Furthermore, as shown in FIG. 2, the main body 1 can be separated into an upper unit 11 and a lower unit 12 with a paper transport path 51 as a boundary.

One end of the upper unit 11 is rotatably supported by the lower unit 12 via a support shaft (fulcrum) 52, so that the upper unit 11 can be opened and closed. Moreover, in this way, the upper and lower units 1, . The main body 1, which can be separated into 12', is provided with an opening/closing mechanism 53 for opening and closing the upper part 22 and the throat 11 with respect to the lower unit 1□. If the paper P gets stuck in the paper transport path 51 for some reason,
Most of the paper conveyance path 51 can be opened, and the jammed paper P can be easily removed.

FIG. 3 shows the operation i4 channel, including a copy key 131 for issuing a copy start command, and a numeric keypad 13 for setting the number of copies, etc.
2. A display 133 for displaying the number of copies, a density setting device 134 for setting the copy density, an upper cassette selection key 135 for selecting the upper paper feed cassette 13, and its indicator light (LED).
) 136, lower cassette selection key 137 for selecting the lower paper feed cassette 14 and its indicator light (LED) 738, paper size indicators 239, 140 for each cassette, enlargement specification key 143, reduction specification key 143, copy magnification display element (LED) 141. The enlargement designation key 14''3 is used to increase the copy magnification by 1% when pressed, and the reduction designation key 142 is used to decrease the copy magnification by 1% when pressed. Also, the copy magnification display element 141 enlarges the image.

The copy magnification corresponding to the operation of the reduction designation keys 143 and 142 is displayed.

FIG. 4 shows an example of the configuration of a drive source for each drive section of the copying machine 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 lens block 8 in order to perform magnification change. Reference numeral 32 denotes a mirror motor, which controls the distance (
This is a motor for changing the optical path length. 33 is a scanning motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original.
It is evening.

34 is a shutter motor, which connects the photosensitive drum 10 when changing magnification.
This is a motor for moving a shutter (not shown) for adjusting the charging width by the charger 11. 35
A developing motor is a motor for driving the developing roller of the developing device 12 and the like. A drum motor 36 is a motor for driving the photosensitive drum 10. A fixing motor 37 is a motor for driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24. 38 is a paper feed motor, which is connected to the feed roller 1.
This is a motor for driving 5.16. Reference numeral 39 denotes a paper feed motor, which is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29. Reference numeral 160 denotes a monitor for driving indicators 161 and 162 for displaying a copyable range, which will be described later.

FIG. 5 shows a moving mechanism for moving the optical system 3 back and forth. That is, the mirror 5 (and the exposure lamp 4) is supported by a first carriage 411, the mirror 6.2 is supported by a second carriage 412, and these carriages 411.412 are supported by guide rails 421.42.
It is guided by and can freely move in parallel in the direction of arrow a.

Thus, the 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, the rail 4220 guide portion 46 of the second carriage 412 that supports the mirror 6.7 has a rail 4
2! Two pulleys 47, 47 are rotatably provided apart from each other in the axial direction, 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 upper fixing part 49 via a coil spring 50. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. As the pulse motor 33 rotates, the belt 45 rotates and the first carriage 41
1 moves, and the second carriage 412 also moves accordingly. At this time, since the gooses 1747 and 47 act as movable pulleys, the second carriage 412 moves in the same direction at 1/2 the speed of the first carriage 411. In addition, 1. Second carriage 411.41. The direction of movement is controlled by switching the direction of rotation of the Noyals motor 330.

The first carriage 411 adjusts the length of the paper P in the feeding direction according to the paper size of the selected paper feed cassette;
It is set at a position indicating the copyable range based on the copy magnification.

6 and 7 show the relationship between the document table 2 and the moving mechanism for moving the optical system 3. FIG. That is, the document table 2 on the top surface of the main body 1 is provided with a positioning portion 6 parallel to the first carriage 411 for aligning one side of the document. Indicators 161 and 162 are provided to indicate. The indicators 161 and 162 are directed in the direction along the positioning part 61, that is, in the direction along the positioning part 61,
It is movable in a direction perpendicular to the moving direction of the first carriage 41H. Further, the first carriage 411 supporting the exposure lamp 4 is provided with an upper part thereof (that is, an original platen 2).
A scale 62 indicating the copyable range on the document table 2 is provided at the lower part of the document table 2 . In addition, the above scale.

The scale 62 is set at a position corresponding to the copyable range defined by the length of the paper in the feeding direction and the copying magnification according to the paper size of the selected paper feed cassette. 621 indicates its position. Further, the indicators 161 and 162 are set at positions corresponding to the copyable range determined by the length in the width direction of the paper and the copying magnification, and the inside thereof represents the copyable range.

FIG. 8 shows the configuration of display means for indicating the copyable range. Each of the indicators 161 and 162 has a flat plate shape, for example, and has a first guide shaft 163 at its base end.
is penetrated, and the tip portion is in sliding contact with the second guide shaft 164. Further, each indicator 161, 162 is provided with a locking tool 165, 166, respectively.
5, 166 is a pillar portion 1711 of a wire 171 provided parallel to the first guide shaft 163 between pulleys 167 to 170. They are attached to the return portions 1712, respectively.

The pulley 167 is provided on the motor 160, and the pulley 167
70Fi is provided on a holding plate 172 which is rotatably held at one end. This holding plate 172 is biased by a coil spring 173 in the two directions shown by the arrows.
1 is given a predetermined tension. However, motor 1
Depending on the direction of rotation of the indicator 60, the indicators 161 and 162 are driven toward or away from each other. In addition, the above-mentioned No. 1. A switch 174 that can come into contact with the indicator 162 is provided between the second guide shafts 163 and 164. This switch 174 is for preventing positional deviation due to slippage between the wire 171 and the pulleys 167 to 170, and the reference position is obtained by operating this switch 174.

Note that during the exposure process (copying operation), the indicators 161 and 162 are placed 3 to 3 mm from both ends of the document size 175 that can be copied, in order to prevent the exposure shadow caused by the indicators 161 and 162.
・It was moved to a position about 10 meters away and returned to the light position after exposure.

The name is like that.

FIG. 9 shows a modification of the indicator, which is designed to prevent the amount of exposure to the original from decreasing. That is,
In the figure ( ), the back surface 182 of the indicator 181 is painted white. In the figure (b), the indicator 183 is shaped like a needle and its surface area is reduced. In the same figure (C), a plurality of through holes 185 are provided in the indicator 184 to form a net shape.

FIG. 10 shows the overall control circuit, in which the main processor group 71 and the first . 2nd subprocessor group 72.73
It is mainly composed of. The main processor group 71 includes an operation panel 74 and various switches and sensors such as the cassette size detection switches 301, 30 . A high-voltage transformer 76 that detects inputs from input devices 75 such as, and drives the various chargers, the static elimination lamp 28, the platen lenoid 27a of the cleaner 27, the heater 23a of the fixing roller pair 23, the exposure lens 4, The copying operation described above is performed by controlling each of the motors 31 to 40 and the like. Among the motors 31 to 40, motor 35.3
7.40 and the toner motor 77 that supplies toner to the main unit 12 is controlled by the main processor group 71 via the main processor driver 78, and the motors 31 to 34 are controlled by the main processor group 71 via the main motor driver 79. 1 Sap derose, Su group 7
The motors 36.3B, 39, 160 are controlled by the second f processor group 73 via the 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 23m is controlled by the main processor group 71 via the heater control section 82. From the main processor group 21, the first. Commands to drive and stop each motor are sent to the second sub-processor group 72 and 73, and the first... From the second sub-processor group 72, 73 to the main processor group 71, a status indicating the drive/stop state of each motor is sent. The first sub-processor group 72 also includes motors 31 to 31.
Position information from a position sensor 83 that detects each of the 34 initial positions is input.

FIG. 11 shows an example of the structure of the main group 71. In other words, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which has input/output/
- Detection of human power on keys on an operation panel (not shown) and various display controls are performed via the port 92. Furthermore, the microcomputer 91 is expanded with input/output ports 93-96. The input/output port 93 is connected to a high voltage transformer 76, motor driver 78, lamp regulator 81, and other outputs, and the input/output port 94 is connected to a Cybuzz switch for detecting paper size and its individual inputs.
A copy condition setting switch and its respective inputs are connected to the input/output port 95. Note that the input/output port 96 is for an option.

FIG. 12 shows an example of the configuration of the first sub-processor group 72. That is, 1011d is a microcomputer and is connected to the main processor group 71. 102 is 4
programmable for phase switching interval time control of
The interval timer starts counting based on the set value set by the microcomputer 101, and when the count is out, the interval timer ends.
Output to interrupt line 1. A reference clock pulse is input to the timer 102. Also, microcontroller 1
01 receives position information from the position sensor 83, and is connected to input/output capos 1-103 and 104.

The motors 31 to 34 are connected to the input/output port 104 via the pulse motor driver 79. In addition, the above input/output capo) 1031-1, each) 4
Main processor group 71 for status signals of the Luss motor
Used for output to etc.

FIG. 13 shows an example of the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71. This is a programmable internonyl timer for controlling the phase switching interval time of the 112Fi14 motor, and when a setting value is set by the microcomputer 111, it counts based on the setting value, and outputs a termination pulse when it counts out. This termination pulse is then latched by the child circuit 113, and its output is supplied to the interrupt line of the microcomputer 111 and the input/output port input line.

An input/output port 114 is connected to the microcontroller 111, and the input/output port 114 is connected to the motors 36.3B, 39 via the pulse motor driver 80.
, J60 are connected.

Figure 14 shows the control circuit of the pulse motor, and shows input/output port 121 (input/output port 1 in Figures 12 and 13).
04,114) has a pulse motor driver 122.
(corresponding to Fig. 10) and A smoke dry brush 9.80) are connected to this pulse motor dry nose 122. equivalent) each winding A.

A, B, and T are connected.

FIG. 15 shows a method of controlling the speed of a four-wheel motor, in which figure (a) shows the speed curve of the main motor, and figure (b) shows the phase switching interval. As is clear from this figure,
At first, the phase switching intervals are long, gradually become shorter, then become equal intervals, gradually become longer again, and then stop. That is, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, starting up, being used in the high-speed region, and then eventually falling down. In addition, h1+t2...t
” indicates the phase switching interval time.

Next, the operation in such a configuration will be explained. For example, right now, after turning on the power, ``Main Glossary'' appears.

The group 71 checks whether the paper P remains on the paper conveyance path 51 in response to a signal from the switch sensor 75. If there is no remaining main processor group 71,
)13. The microcomputer 10 of the group 72 determines the paper size of the paper P and subprocesses an initialization signal of the optical system 3 and a signal indicating the length LP of the paper P according to the result of this judgment.
Output to 1. Then, the microcomputer 101 uses the i4 motor driver 79 to move the motor 33 to the first . The second carriage 411, 419 is moved. As a result, if the mirror 5 was at point A immediately before the power was turned on as shown in FIG. 1, it is moved from point A to point B. The microcomputer 101 then moves the scale 62 for a predetermined period of time after the initial position device detection signal for the motor 33 is output from the position sensor 83 until the scale @ 621 (scale position L) of the scale 62 becomes the length of the paper P in the transport direction. Make it move. Accordingly, the mirror 5 is moved from point B to point 0 as shown in FIG. Also,
The main processor group 71 outputs a signal indicating the width DP of the paper P to the microcomputer 111 of the sub-processor group 73. Then, this microcomputer 111 drives the motor 160 via the /IP Luz motor driver sot, and the indicator 161,1
62 so that the distance between the inner sides thereof is equal to the width DP of the paper P.

As a result, for example, if A4 size paper is set in the upper cassette, the copying range for A4 size paper °P is 41" Lp on document table 2, as shown in FIG.
# "!" is specified as DP, and the user can instantly determine that the shaded area (ltXts) is the copyable range. Furthermore, the microcomputer 101 moves the lens, mirror, shutter, and shutter to the initial position by driving the Vf motor 31, the mirror motor 32, and the shutter motor 34 using the armature motor driver 79. to the same magnification position and complete the initialization. Further, when the power is turned on, the main processor group 71 turns on the driver motor 40 by driving the heater driver 7B, and turns on the heater 23 by controlling the heater controller 82.
I'm on site. Then, when the temperature of the heater 23m reaches a temperature that allows fixing, the main processor group 41 displays a message indicating that copying is possible.

Next, an explanation will be given of the operation when the enlargement specification key 143 of the operation section is pressed to instruct enlarged copying in such a state. Main processor 71#-4 first displays on the display element 141 an enlargement rate of M%. Next, by the output signal of A4 cassette size detection switch 301,
The sizes LP and D of the paper P are determined, and a signal requesting the enlargement ratio M% and the length LP of the paper P is output to the microcomputer 101. This signal is a signal that moves the contour line 611 of the scale 61 to the position where tl=L, the letter X. Based on this signal, the microcomputer 101 drives the motor 33 via the motor driver 79, as described above, to move the first carriage 411 in the direction of the arrow Y shown in FIG. 7 in this example. next,
The main processor group 71 calculates the magnification rate M% and the width DP of the paper P.
A twisted signal is output to the microcomputer 111. This signal is a signal for moving the indicators 161 and 162 to the position t, = DPX. Based on this signal, the microcomputer 111 controls the motor 16 via the motor driver 80.
0 to move the indicators 161 and 162 in the directions of arrows W and X shown in FIG. 7 in this example. In this way, scale 6.1° indicators 161, 16;! FIG. 16 shows a state in which the above-mentioned tl has been moved to a remote position. This state indicates that the shaded area (z, xzs) in the figure is enlarged and copied to the size of paper P (A4 in this example). Therefore, the user can instantly determine that this area indicates the copyable range. Next, the main lens group 71 drives the lens motor 31 to move the lens 8 to a distance corresponding to the magnification ratio M. Therefore, the lens 8 is moved in the direction of arrow V shown in FIG. At the same time, the mirror motor 32 is also driven to set the optical path length.

Next, an explanation will be given of the operation when the reduction specification key 142 is pressed in such a state and N% reduction copying is specified. First, the main processor group 71 displays the reduction ratio Nchi on the display element 141. Next, in order to adjust the lens to the reduced position, the lens motor 31 is driven to move the lens 8 in the direction of arrow U shown in FIG.

At the same time, the mirror motor 32 is also driven to set the optical path length. Next, as mentioned above, the first cylinder
1. Move the indicators 161 and 162 two times in the directions of arrows R, S, and T shown in FIG.
21 and indicators 1-61 and 162, respectively, t1=LPx! Move to the position where P 00 t,=D, x-Fr-. This state is shown in FIG. Therefore, the user can instantly determine that the shaded area (t1×tt) in the diagram indicates the copyable range.

The operation is exactly the same when switching between the upper and lower cassettes, or when the size of the paper P changes due to replacing the cassette.

Further, the driving order of the first gear, the gear 411, and the lens 8 is as follows.

Enlarge → Reduce 1) Lens 8.2) First carriage 411 Reduce → Enlarge 1) First carriage 411 . 2) Lens 8 This is to prevent the mirror 6.7, which moves in conjunction with the first carriage 411, from colliding with the lens 8.

Next, scale 62. as described above. Indicator 161.16
2 is set, the operation when the copy key 131 is pressed will be described. First, by the method described above, the indicators 161 and 162 are moved to the limits on both sides of the document table 2, as shown in FIG. 18, so that they do not appear as images, and are moved to the first carriage 4JIFi home position. . The microcomputer 101 then drives the 1.81!2 carriage 47 by driving the 33.
1. Run 42@.

At this time, the main processor group 71
The lighting is controlled. As a result, the light from the exposure lamp 4 is irradiated onto the original. The reflected light from this original is mirrored by mirrors 5 and 6.
．． 71 further reaches the mirror 9 via the lens block 8 for variable magnification, is reflected by the mirror 9, and is applied to the photoreceptor drum 10.
guided by. As a result, an electrostatic latent image of the document is formed on the photoreceptor drum 10, and this electrostatic latent image is formed on the photoreceptor drum 10.
0 rotation, it is sent to the developing device 12 and developed. At this time, the paper P from the paper feed cassette 14 is taken out and sent between the photoreceptor drum 10 and the transfer charger 20 via the registration rollers 19. Here, the image on the photosensitive drum 10 is transferred onto the surface of the sheet P by the action of the transfer charger 20, and after this transfer, it is peeled off by the action of the peeling charger 21. Then, the sheet P on which the image has been transferred is conveyed to a pair of fixing rollers 23 by the running of the conveyor belt 22, where the image is fixed, and is discharged by a pair of discharge rollers 24 and 24.

Then, when the document scanning is completed, the first carriage 411
and indicators 161 and 162 are shown in FIGS. 7, 16, and 1.
It is returned to the set position as shown in Figure 7.

In addition, when copying multiple sheets in succession, use the indicator 1 all the time.
61 and 162 are moved to both ends of the document table 20, and returned to the predetermined setting position after copying is completed.

According to the above embodiment, the indicators 161 and 162 and the scale 62 are moved according to the selected paper size and the set magnification, and thereby the seven copyable ranges are displayed on the document table 2. There is. Therefore, since the user can easily recognize the copyable range, it is possible to prevent copying errors.

In the above embodiment, the indicators 161 and 162 are mechanically moved to display the copyable range, but the present invention is not limited to this. For example, instead of the indicators 161 and 162, a plurality of The light emitting diodes may be arranged in a straight line, and two of the light emitting diodes may be turned on corresponding to the copyable range.

Further, in the above embodiment, the case where the present invention is applied to a copying machine with a movable document table has been described, but the present invention is not limited to this, and it is also possible to apply the present invention to a copying machine with a movable document table. In this case, the scale may be one side of the moving document table.

It goes without saying that other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

As described above in detail, according to the present invention, it is possible to provide an image forming apparatus in which the ridge image forming range can be confirmed and image forming errors can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view showing the overall configuration, FIG. 2 is a diagram for explaining the open/closed state, and FIG. 3 is a diagram showing the configuration of the operating panel. A plan view showing,
FIG. 4 is a perspective view showing an example of the configuration of the drive unit, FIG. 5 is a perspective view schematically showing the optical system moving mechanism, and FIGS. 6 and 7 are the relationship between the document table and the optical system moving mechanism. FIG. 8 is a perspective view of the main part showing the configuration of the display means, FIG. 9(a)
(b) and (C) are perspective views showing modified examples of the indicator, FIG. 10 is a block diagram of the overall control circuit, and FIG. Figure 1 is the configuration diagram of the main process group, and Figure 12 is the configuration diagram of the first sub-process group. Figure 13'' is a configuration diagram of the second sub-process group, Figure 14 is a schematic configuration diagram showing the control circuit of the Noculus motor, Figure 15 is a diagram for explaining the speed control method of the Noculus motor, and Figures 16 to 16. Fig. 18 is a diagram shown to explain the operation of the display means on the document table. 1...Main body, 11...Upper unit, 12...Lower unit, 2... Document table, 3 ...optical system, 5,6
゜7.9... Mirror, 8... Variable magnification lens 20. 10... Photosensitive drum, 13... Upper paper feed cassette, 14... Lower paper feed cassette, P... Paper (image forming body), 301 + 302... Cassette size detection switch , 31... lens motor, 32...
Mirror motor, 33...Scanning motor, 411...
・First carriage (moving mechanism), 412...Second carriage (moving mechanism), 61.62...Scale, 62
1...Glass line, 71...Main process, group, 91
．． 101... Microcomputer, 13... Copy key, 13
5... Upper cassette selection key, 137... Lower cassette selection key, 160... Motor, 161, 162...
Indicator. Applicant's agent Patent attorney Suzue Takehiko Figure 2)j Figure 3 Figure 4 Figure 7 Figure 1 Figure 8 (a) (b) (c) Figure 11 Figure 12 Figure 13 i', j% 171Figure 15Figure 16Figure 17Figure 18

Claims (6)

[Claims] (1) In an image forming apparatus that forms an image on a recording medium by scanning a document placed on a document table with an optical scanning means, a designation means for specifying an image formation magnification and a size of the recording medium are detected. a detection means, and a first display that moves along one side of the document table and displays an image forming area according to the size of the recording medium detected by the detection means and the image formation magnification specified by the specification means. and a second display means that moves in a direction perpendicular to one side of the document table and displays a range in which an image can be formed. (2) The first display means comprises an indicator movable along one side of the document table, and the second display means comprises a moving optical scanning means.
The image forming apparatus described in . (3) The image forming apparatus according to claim 1, wherein the second display means is one side of a moving document table. (4) The image forming apparatus according to claim 1, wherein the first display means comprises a light emitting body. (5) Image formation according to claim 2, wherein the first display means is moved outside the exposure range in the image forming state, and the second display means is moved to a scanning start position. Device. (6) The first and second display means are in an image format. 6. The image forming apparatus according to claim 5, wherein the image forming apparatus is moved to a position where an image forming area is displayed after completion of the image forming process.