JPS6215534A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce misoperation by providing movable pointers which indicate a longitudinal image formation range for an original image under respective fixed scale plates, and moving one pointer to an invisible position when the other pointer is at a visible position. CONSTITUTION:Fixed scale plates 21 and 22 consist of a transparent part 2a and a white opaque part 2b. The width of the transparent part 2a corresponds to maximum copy width Xs (visible position) and pointers 51 and 52 or 51' and 52' when exceeding the maximum copy width Xs move to under the opaque parts 2b and can not be seen by an operator. Namely, they are at invisible positions. The pointers 51 and 52 are provided to a belt 57 extended between pulleys 54 and 55. The pulley 55 is rotated by a motor 58, which is driven according to the size of a form and magnification to vary the mutual distance between the pointers 51 and 52.

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 its problems]

2. Description of the Related Art In general, electronic copying machines have been developed and put into practical use that are provided with a guideline for instructing the copy range in the vertical direction with respect to an original image. However, in such a device, there was no means to make the above-mentioned pointer invisible.

(Object of the invention) This invention □ has been made based on the above circumstances, and its purpose is to read a manuscript based on one or the other fixed scale plate placed at both ends of the manuscript table. In an image forming apparatus that performs image formation by placing...
Image formation can be performed at either end, and the formation range can be confirmed at each location.
An object of the present invention is to provide an image forming apparatus that can reduce operational errors by making the other finger invisible when one finger button is used.

[Opportunity for the invention] “In order to achieve the above object, the present invention provides an image forming method in which an original is placed on one or the other fixed scale plate installed at both ends of a document table to form an image. In the apparatus, a movable pointer is provided at the bottom of each of the ten fixed scale plates to indicate the image forming range in the vertical direction relative to the original image.

When one hand is in the visible position, the other finger $1 is moved to the invisible position.

[Embodiments of the invention]

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

6 and 7 schematically show an image forming apparatus of the present invention, such as a copying machine. l' 6-guru. The number is
Reference numeral 1 denotes a copying machine main body, and a document table (transparent glass) 2 is fixed to the lower surface of the main body 1 to support a document. Fixed schools 2r and 22 are provided at both ends in the longitudinal direction of the document table 2, and are fixed schools 2r and 22, which serve as a reference for setting the document. A document cover 11 and a work table 12, which can be closed freely, are provided. The original placed on the original table 2 is exposed to an exposure lamp 4, a mirror 5.
6. The optical system consisting of 7 is mounted on the bottom surface of the document table 2 and
By reciprocating in the direction, exposure scanning is performed during the reciprocating movement. In this case, mirror 6.7 moves at 1/2 the speed of mirror 5 so as to maintain the light exposure. ” - The light reflected from the original by the scanning of the optical distribution 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 and then passes through the variable magnification lens block 8. , the document is further deflected by the mirror 9 and guided to the photoreceptor drum 10, and 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 an image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is formed by toner being deposited by the developing device 12. It is now converted into an R image.

On the other hand, the paper (transfer material) P is taken out one by one from the selected upper paper feed cassette 13 or the lower paper feed force cellars 1 to 14 by the delivery row 515 or 16. The paper ρ that has been taken out is transferred to the paper guide path 17 or 1.
8 to the resist 1-roller pair 19, and is guided to the transfer section by the register 1-roller pair 11].

Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1. You can select either one on the operating panel. Note that the cassette size of each of the paper feed ports 13 and 14 is detected by cassette size detection switches 601 and 602, respectively. The cassette size detection switches 601 and 602 are composed of a plurality of microswitches that are turned on and off depending on the size of the cassette inserted into the cutter 1.

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, and the toner image on the photoreceptor drum 10 is transferred by the action of the charger 2o. Ru. The transferred paper P is electrostatically peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed by a conveyor belt 22C', and a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22C' are conveyed. The transferred image is fixed by passing through this area. After fixing, the paper P is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 24. Further, after the photosensitive drum 10 has been transferred, the static electricity is removed by a static electricity removal charger 26, and residual toner on the surface is removed by a cleaner 27.
The afterimage is roughly erased by the static eliminating lamp 28, so that the initial state is restored. Note that 29 is a cooling fan that prevents the temperature inside the main body 1 from rising.

FIG. 8 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 section that displays the operating status of each section and the size of the paper; 304 is a cassette for selecting the upper and lower paper feed cassettes 13 and 14;
A selection key, 305 is a cassette display section for displaying the selected cassette, 30s is a magnification setting key for setting the enlargement/reduction magnification of copying in a predetermined relationship, 307 is a zoom key for steplessly setting the enlargement/reduction magnification, 30s 30e is a display unit that displays the set magnification, 30e is a density setting unit that sets the copying degree, 30a, 30b, 130c, and 30d are operation keys that move a spot light source that indicates the erase position of the original, which will be described later. 30e is a spot light source. 30f and 300 are respectively erasing range specifying keys for specifying the erasing range at the designated position.
0h is an erase mode designation key that designates the erase mode.

FIG. 9 does not show an example of the drive source configuration of each drive unit of the copying machine configured as described above, and is composed of a motor as shown below. That is, 31 is a motor for one lens, which is a motor for moving the position of the lens block 8 for changing the magnification. 32 is a mirror motor, and is a tanabata for changing the distance 1 itu (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification by 11 times. A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and 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. Reference numeral 39 is a feed motor, which is a motor for driving the pair of registration rollers 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 10 shows a drive mechanism for reciprocating the front optical system. That is, the mirror 5 and the exposure lamp 4 are connected to the first carriage 411, and the mirror 6.7 is connected to the second
These carriages 411 and 412 are supported by guide rails 421 and 422, respectively. ．． 422
It is guided by and can freely move in parallel in the direction of arrow a.

? 4-phase pulse motor 331. The t-pulley 43 is driven. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44.
One end of a first carriage 411 that supports the mirror 5 is fixed in the middle of the mirror. On the other hand, a rail 422 is attached to the guide portion 46 of the second carriage 422 that supports the mirror 6.7.
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 fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. Further, one end of a first carriage 1411 is fixed to the middle part of the wire 48. Therefore, when the pulse motor 33 rotates, the belt 45 rotates and the first carriage 4
11 is moved, and the second carriage 422 is also moved accordingly.

-〇- At this time, since the pulleys 47 and 47 serve as movable purifiers, the second carriage 422 is connected to the first carriage 411.
are moved in the same direction at 1/2 the speed. In addition, the first
The moving directions of the second carriages 411 and 412 are controlled by switching the rotation direction of the pulse motor 33.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. When the copy key 301 is pressed, the first 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 41
1 is returned to the home position.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper selection key 304
Let the paper size specified by <pxlt”) be
Copy f specified by magnification setting keys 306 and 307
If the R rate is K, the copyable range (x, y), rX=P
X/Kl.

ry=Py/KJ. This copyable range (X, y)
Of these, the X direction is shown in FIGS. or the fixed scale plate 2 provided at the right end of the document table 2.
2, and the X direction is indicated by a scale 53 provided on the upper surface of the first carriage 41.

The fixed scale plates 21 and 22 each have a transparent portion 2a.
and a white opaque portion 2b. The width of the transparent portion 2a is the maximum copying width Xu (visible position). As a result, the pointer 51.52 or the pointer 51 +,
When the width 52- exceeds the maximum copying width Xs, it moves to the lower part of the opaque portion 2b and becomes invisible to the operator, that is, becomes an invisible position.

-j 2nd pointer 51.52 is shown in Figure 3 and Figure 4.
It is set in. The pulley 55 is rotated by a motor 58, and by driving the motor 58 according to the paper size and magnification, the distance between the pointers 5L and 52 can be changed. . The range X indicated by the finger button 5L 52 is the width in the vertical direction as the copyable range, and the pointer 5L 5
2 can be moved outside the maximum copying width XS. Further, the above-mentioned pointers 51+, 52= are also the above-mentioned points 51+, 52=.
．． 52, it is driven by a motor 58-.

FIG. 11 shows the overall control circuit, which includes the main processor 9 group 71 and the 1st processor. Second sub-processor group 72.
It is mainly composed of 73. Main processor group 7 above
1 is an operation panel 30 and various switches or sensors, such as the cassette size detection switch 601.
, 602 and other input devices 75 to drive the various chargers, the static elimination lamp 28, and the play 1 to solenoid 27 of the cleaner 27.
a, -40, '58, etc. are controlled to the heater 23a of the fixing roller pair 23, the exposure lamp 4, and each of the motors 31 to perform the above-mentioned copying operation, and also perform the spot light! 131, pulse motor 135, memory 140, erasing array 15o1 array drive unit 160, etc. to perform an operation to erase unnecessary portions of the document. Note that a spot light source 131, a pulse motor 135, and an erasing array 150
, the array driver 160, and the memory 140 will be described later.

Among the motors 31 to 40, 58.58', motor 3
5, 37, 40 and the developing unit 12 are controlled by the main processor group 71 via a motor driver 78, and the motors 31 to 34 and 135 are controlled via a pulse motor driver 79. First
Controlled by sub-processor group 72, motors 36, 39 .
3B.

58 and 58- are controlled by the second sub-processor group 73 via the pulse motor driver 8o. 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 heater control section 82.
It is controlled by the main processor group 71 via the main processor group 71. Then, from the main processor group 71, the first. Commands to drive and stop each motor are sent to the second sub-processor group 72 and 73, and status signals indicating the driving and stopping states of each motor are sent from the first and second sub-processor groups 72 and 73 to the main processor group 71. Sent. 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.

FIG. 12 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter abbreviated as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Furthermore, the microcomputer 91 is expanded by input/output ports 93-96. The input/output boat 93 is connected to a high voltage transformer 76, motor dry buffer 8, lamp regulator 81, and other outputs, and the input/output h boat 94 is connected to a size switch for detecting paper size and other inputs. A transcription condition setting switch and other human power are connected to the input/output boat 95. Note that the input/output port 96 is an option.

FIG. 13 shows an example of the configuration of the first sub-processor number group 72. 101 is a mine, which is connected to the main processor 1f group 71. Reference numeral 102 is a programmable interval timer for controlling the phase switching period of the pulse motor.When a setting value is set from the microcomputer 101, it starts counting based on the setting value, and when it counts out, it outputs an end pulse to the microcomputer 101. Output to interrupt line. A 131% clock pulse is input to the timer 102. Also,
The microcomputer 101 receives position information from the position sensor 83, and input/output ports 103 and 104.
is connected. The input/output boat 104 is connected to the motor 31 via the pulse motor driver 79.
~34.135 are connected. Note that the input/output board 103 (well, it is used for outputting status signals of each pulse motor to the main processor group 71, etc.).

FIG. 14 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, a start pulse is output based on the set value, and when the count is out, an end pulse is output. 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. Also, microcomputer 111
An input/output capo t-114 is connected to the output capo h'l14, and a motor 36, 38, 39, 58, 58- is connected to this output capo h'l14 via the pulse motor driver 80.

Figure 15 shows the control circuit of the pulse motor.
A pulse motor driver 122 (corresponding to the pulse motor driver 79, 80 in Fig. 11) is connected to the input/output port 1-121 (corresponding to the input/output boat 104, 114 in Figs. 13 and 14). The motor driver 122 has a pulse motor 123 (the pulse motors 31 to 34.3
6.38.39) are connected.

FIG. 16 shows a method for controlling the speed of a pulse motor. FIG. 3(a) shows the speed curve of the pulse motor, and FIG. 1(b) shows the phase switching interval.

As is clear from this figure, the phase switching interval is long at the beginning;
They gradually shorten, eventually become evenly spaced, then gradually become longer and longer, and then stop. That is, this indicates the through-up and through-down of the pulse motor, which starts from the self-starting m range, is used in the high speed range, and then falls down. In addition, t! , t2...tx indicate the time of the phase switching interval.

Next, the document image erasing means according to the present invention includes explain about.

17 and 18, the first carriage 411 is provided with a guide shaft 130 along the lamp 4 in the part where the light of the lamp 4 is blocked, and this guide shaft 130 has a guide shaft 130 for marking the erasing range of the document. Spot light source 1 as a means of giving instructions
31 is movably provided. This spot light source 131 is, as shown in FIG.
The light generated by the lens 32 is irradiated onto the document table 2 by a lens 133 as a spot light having a diameter d. This light has a brightness that allows it to pass through the document G set on the document table 2, for example, as thick as a postcard. In addition, the spot light source 131 is connected to the guide shaft 1
The timing belt 134 is connected to a timing belt (toothed bell l-> 134 disposed along ing.

Therefore, by rotating the pulse motor 135, the spot light a131 is moved in a direction perpendicular to the scanning direction of the first main shaft 411.

In addition, a first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side has a slot l-light 4.13.
A position sensor 138 consisting of a microswitch capable of detecting the initial position f1 is provided.

For example, when the spot light source 131 is moved, the spot light source 131 first comes into contact with the position sensor +7-138 and its initial position is detected.

Next, a method of specifying the erasing range of the document using the upper two spot light sources 131 will be described. This spot light [1
31 is moved with the light emitting element 132 turned on by operating the previous operation keys 30a to 30d. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first carriage 411 and the spot light source 131 are moved in the scanning direction in the direction of arrow y shown in FIG.
direction). Further, when the operation keys 30a and 30c are pressed, the motor 135 is driven and the spot light source 131
is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 19). The operator operates the operation keys 308 to 30d while visually observing the spot light that has passed through the document G. For example, after moving the spotlight to 81 points on the document G-L shown in FIG. 20(a), the operator presses the position designation key. Press 30e. Then, the coordinate position specified in 81 is stored in the main processor group 71 shown in FIG. In the same way, move the spot I to the light to 82 points on the document G and press the position designation key 30e (then the position of the point S2 is stored in the main processor group 71. The position can be detected, for example, by counting the number of drive pulses of the pulse motor 33,135.

After that, when you press the erase range designation key 3Qf, as shown in Fig. 20 (
As shown in a), a rectangular area (indicated by diagonal lines) that covers the 81.32 points along with the diagonal points is designated as the erasure range. In addition, as shown in FIG. 20(b), specify points 89 and 84 on the original G, and press the erase range specifying key 30 (IJ).
, 84 points as diagonal points other than the square are designated as the erasure range. In this way, the erase range specification key 30.
f.

When 300 is pressed, the main processor group 71 performs calculations based on the specified two-point positions and the copying magnification, and the memory 140 stores a high-level signal l1 in the erase range.
1I+, low level signal II, O for other parts
II is stored. 71h Also, this memory 140 is an RA whose capacity in each column direction is approximately equal to the moving distance of the spot light source 131 in the X direction ÷ V and the position resolution in the Zj direction.
21(a) in the case of FIG. 20(a), and as shown in FIG.
), as shown in FIG. 21(b), a high level signal is stored in the address corresponding to the shaded area, and a low level signal is stored in the other addresses.

That is, in this case, the original G is set on the fixed scale plate 22 side with the copy side facing up, and after the erasure range is specified, it is turned over and set along the fixed scale plate 21. Therefore, as shown in FIG. 21, the information stored in the memory 140 is also actually stored inverted in the tyh direction.

On the other hand, as shown in FIG. 22, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section ph. As shown in FIGS. 23 and 24, this erasing array 150 has a plurality of light-shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and each light-shielding cell 151 has a A light emitting element 152 made of a light emitting diode, for example, as shown in FIGS. 25(a) and 25(b) is provided. Furthermore, a lens 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 10 . The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 140 in the column direction. Here, if the distance between the light emitting elements 152 is P and the number is N, the total length of the erase array 50 is Q='NXP.

-22= The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 26, this array driving section 160 includes a shift register 161 having the same number of pits as the number of bits in the column direction of the memory 140, a store register 162 that holds the contents of this shift register 161, and a store register 162 that holds the contents of this shift register 161. The switch circuit 164 is composed of a plurality of switch elements 163 that are turned on and off by each output signal of the store register 162. The movable contacts 163a of these switch elements 163 are grounded, and the fixed contacts 163b are grounded. It is connected to each cathode of the light emitting elements 152 constituting the erase array 150. The anode of each of these light emitting elements 152 is connected to the power supply VCC through a current limiting resistor R, respectively.

After specifying the erase range of the original as described above, close the original cover 11 and press the copy key 3'O1.
As the first carriage 411 and photosensitive drum 10 are operated, data for one column is sequentially read from the memory 140 in the row direction (as shown in FIG. 21). This read data D1 is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK.

After one column of data is transferred to the shift register 161, the charged portion of the photoreceptor drum 10 is transferred to the erase array 15.
When it reaches 0, the main processor group 71 outputs a latch signal L T l], which is supplied to the shift register 162 in response to this signal.

That is, the erasure array 150 includes the charger 11 and the exposure section Ph.
For example, one row of data output from the memory 140 is arranged between the erase array 15 and
0 and the exposed part Ph is θ1, and the photoreceptor drum 10
is rotating at each speed, the latch signal LT is supplied to the store register 162 before θ1/ω.
The output timing of H is controlled.

Each switch element 163 of the switch circuit 164 is controlled by the output signal of the store register 162. That is, when the output level of the store register 162 is high level, it is turned on, and when it is low level, it is turned off. As a result, the light emitting elements 152 connected to each switch element 163 are turned on when the switch element 162 is on, and are turned off when the switch element 162 is off. Therefore, among the charged parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Next, the gist of the invention will be explained with reference to FIG. For example, right now, the operator presses the erase mode designation key 30h.
Insert. Then, the main processor group 71 determines the erase operation and sets the erase mode. Then, the main processor group 71' moves the pointers 51' and 52- by driving the motor 58-, and sets the copyable range (width in the vertical direction: width in the X direction) corresponding to the specified paper. Instruct. Also, at this time, the main processor, group '71
By driving the motor 33, the first kit ridge 411 is moved to create a copyable range corresponding to the paper specified by the scale 53 (horizontal width with fixed scale plate 22: width in the X direction). instruct.

At this time, the main processor group 71 moves the hands 51 and 52 by driving the motor 58 to move them outside the range XS. As a result, the pointers 51 and 52 are hidden under the opaque portion 2b of the fixed scale plate 21 and are no longer visible to the operator.

As a result, it is possible to prevent the operator from placing the document in the wrong position.

In response to such an instruction, the operator sets the original G on the fixed scale plate 22 side with the copy side facing up, as shown in FIG. After the erasure range is specified as described above, the operator presses the erasure range specification keys 30f and 300.
Insert. Then, the main processor group 71 determines that the erasing range designation operation is complete and sets the copy mode.

Then, the main processor group 71 drives the motor 58 to move the hands 51 and 52 to indicate the copyable range (width in the vertical direction: width in the x direction) corresponding to the designated paper. At this time, the main processor group 71 drives the motor 33 to move the first carriage 411 and move the copyable range corresponding to the paper specified by the scale 53 (transverse direction using the fixed scale plate 21 etc.). Width: Indicates the gluing in the yIi direction.

At this time, the main processor group 71 moves the pointer 51-152- to the outside of the range XS by driving the motor 58-.

As a result, the pointer 51-152- is moved to the fixed scale plate 21.
It is hidden under the opaque portion 2b of the opaque portion 2b, and is no longer visible to the operator. As a result, it is possible to prevent the operator from placing the document in the wrong position.

In response to such an instruction, the operator sets the document G(7)19 with the back side on the fixed scale plate 21 side, as shown in FIG. Then, in response to the input of the copy key 30+, the above-described erasing and copying operations are performed.

Therefore, when erasing, the guides 51-, 52 indicate which side of the fixed scale plate the document G should be placed on.
-Or fingers! Instructions can be given to the operator using t51-152-, and the document placement position when 1 to rimming is designated is easily known. Also, in the left and right fingers 1t5.1', 52-151'', 52',
Since only the pointer that is used is visible and the pointer that is not used is hidden from view, operator mistakes can be prevented.

Note that the present invention is not limited to the above-described embodiment, and for example, the arrangement position of the erasing array 150 is not limited to that shown in FIG. 22, but as shown in FIG.
2, and the formed electrostatic latent image can be erased according to a designation.

Further, although the case where erasing is performed has been described, the present invention is not limited to this, and can be similarly implemented even if it is used in the case of double-sided copying.

[Effects of the Invention] As described in detail above, according to the present invention, in an image forming apparatus that performs image formation by placing a document with reference to one or the other fixed scale plate provided at both ends of a document table. Although image formation can be performed at either end, the formation range can be confirmed at each site, and when one pointer is used, by making the other pointer invisible. , it is possible to provide an image forming apparatus in which operation errors can be reduced.

[Brief explanation of drawings]

Figures 1 to 26 show one embodiment of the present invention, and Figures 1 and 2 are diagrams for explaining the state in which the original is placed, and Figure 3 is a diagram showing the pointer and fixed scale plate. FIG. 4 is a plan view for explaining the relationship between the pointer and the document table, and FIG. 5 is a diagram for explaining the state in which the document is placed. , Fig. 6 is an external perspective view, Fig. 7
The figure is a side sectional view, FIG. 8 is a plan view showing the configuration of the operation panel, FIG. 9 is a perspective view showing the configuration of the drive section, and FIG. 10 is a perspective view schematically showing the drive mechanism of the optical system. , Fig. 11 is a block diagram showing the overall control circuit, Fig. 12 is a block diagram of the main processor group, Fig. 13 is a block diagram of the first sub-processor group, and Fig. 14 is a block diagram of the 2+j sub-processor group. Fig. 15 is a schematic block diagram showing the control circuit of the pulse motor, Fig. 16 is a diagram for explaining the speed control method of the pulse motor, and Fig. 17 is a perspective view of the main part showing the spot light source. 18 is a side sectional view of the main parts showing the spot light source, FIGS. 19 and 20 are plan views shown to explain the operation of the spot light source, and FIG. 21 is a plan view showing the contents of the memory. , FIG. 22 is a side sectional view of main parts showing the arrangement of the erasing array, FIG. 23 is a perspective view showing the relationship between the erasing array and the photosensitive drum, and FIG. 24 shows the relationship between the erasing array and the photosensitive drum. 25(a) is a side sectional view showing the structure of the erasing array, FIG. 25(b) is a partially cutaway front view showing the structure of the erasing array, and FIG. 26 is the array drive section. FIG. 27 is a side sectional view showing an example of the arrangement of the erasing array in another embodiment. DESCRIPTION OF SYMBOLS 1... Main body, 2... Original table, 2s, 22... Fixed scale plate, 2a... Transparent part, 2b... Opaque part, 10... Photosensitive drum, 30... Operation panel,
30a to 30d...operation keys, 30e...position specification key, 30f, 300...erasure range specification key, 30h
...Erase mode specification key, 51, 52.51-152
-...Pointer, 58.58-...Motor, 71...
Main processor group, 131...Suboc 1~Light source, 1
32... Light emitting element, 133... Lens, 135...
- Pulse motor, 140... Memory, 150... Portrait array, 152... Light emitting element, 153... Lens, 160... Array drive unit, G... Original, P...
・Paper, Ph...Exposure section. Applicant's agent Patent attorney Takehiko Suzu Figure 18 d 1 G Figure 19 Figure 20 Figure 21 (a) (b) Figure 22 Figure 23 Figure 24 Figure 25 (a) (b) Figure 26 15'0

Claims (2)

[Claims] (1) The document placed on the document table is optically scanned using one or the other fixed scale plate provided at both ends of the document table as a reference, and an image corresponding to the image of the document is transferred onto the material to be transferred. In the image forming apparatus for transferring, a pointer is movably provided at the bottom of each of the fixed scale plates to indicate the image forming range in the vertical direction with respect to the original image, and when one pointer is in a visible position, the other pointer is visible. An image forming apparatus characterized by comprising a moving means for moving to a disabled position. (2) The image forming apparatus according to claim 1, wherein the moving means moves the pointer to a lower part of an opaque portion provided on the fixed scale plate.