JPS61116344A - Display device of original setting position - Google Patents

Abstract

PURPOSE:To recognize precisely an area specified by an indicator even if the indicator is hidden by an original by providing a light emitting means to the indicator arranged under a transparent original platen. CONSTITUTION:A copying machine consists of a lens motor 31, mirror motor 32, scanning motor 33, shutter motor 34, developing motor 35, drum motor 36, fixing motor 37, paper feeding motor 38, paper carrying motor 39, fan motor 40, and a motor 160 for driving indicators 161, 162 indicating a copy enabled range. The indicators 161, 162 include light emitting means.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention moves an indicator placed under a transparent document table in accordance with the image forming area, thereby changing the document placement position below the document table. The present invention relates to a document placement position display device that displays a document placement position.

[Technical background of the invention and its problems] A conventional document placement position display device displays the document placement position by moving an indicator under the document table, and an operator looks at the indicator under the document table. The device is configured to place a document by determining the area where an image can be formed.

However, when copying only a portion of a document that is larger than the imageable area indicated by the indicator, the indicator may be hidden by the original, making it difficult to place the necessary part in the imageable area. This resulted in a situation where some necessary images were missing because they could not be overlapped.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to accurately recognize the area indicated by the indicator even if the indicator is hidden by the original placed on the manuscript table. It is an object of the present invention to provide a document placement position display device that can display the document placement position.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides an apparatus for displaying the placement position of a document by moving an indicator provided under a transparent document table to a predetermined position, in which the indicator emits light. By providing the means, even if the indicator is hidden by the document placed on the document table, the light from the light emitter can be seen through from above the document.

[Embodiment 1 of the invention Next, embodiments 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, to which a document placement position display device according to the present invention is applied. 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
An optical system 3 consisting of an exposure lamp and mirrors 5, 6, and 7 reciprocates along the lower surface of the document table 2 in the direction of arrow a, thereby performing exposure scanning during the reciprocation.

In this case, mirror 6.7 moves at half the speed 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 lamp 4, is reflected by the mirrors 5, 6.7, passes through the variable magnification lens block 8, and is roughly reflected by 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 home position of the optical system 3 is near a fulcrum 52, which will be described later, that is, at the right end in the drawing.

The photosensitive drum 10 rotates in the direction of arrow C, and the surface is first charged by the charger 11, and then the image of the document is exposed to slit light to form an electrostatic latent image. The latent image is turned into a visible image by applying toner to the 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 roller pair 19, and sent to a transfer section by this roller pair 19. Here, each of the above paper feed cassettes 13.1
4 is removably provided at the lower right end of the main body 1, and one can be selected from an operation panel (not shown). In addition, each of the above paper feed cassettes 13.
14 are respective cassette size detection switches 301゜3
The cassette size is detected by 02.

The detection switches 30t and 302 are composed of a plurality of microswitches that are turned on and off in accordance with the insertion of cassettes of different sizes. 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. be done. The transferred paper P is peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed by the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22. By passing through this, the transferred image is fixed. 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 thereof is removed by a cleaner 27, and afterimages are erased by a static elimination lamp 28, so that the photosensitive drum 10 returns to its initial state. still,
29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

Here, the above registration roller pair 19. A paper conveyance path 51 is formed by the conveyance belt 22, a pair of paper ejection rollers 24, and a guide plate (not shown) appropriately arranged between these. A charger 20 is arranged, 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. And the above upper unit 1
1 is rotatably supported at one end by the lower unit 12 via a support shaft (fulcrum) 52, and can be opened and opened. Also, in this way the upper and lower units 11.12
The main body 1, which can be separated into two parts, is provided with an opening/closing mechanism 53 for opening and closing the upper unit 11 with respect to the lower unit 12. Then, for some reason, the paper P is transferred to the paper transport path 5.
1, most of the paper transport path 51 can be opened and the jammed paper P can be easily removed.

FIG. 3 shows the operation panel, including a copy key 131 for issuing a command to start copying, and a numeric keypad 132 for setting the number of copies, etc.
, a display 138 for displaying the number of copies, etc., a density setting device 134 for setting copy density, an upper cassette selection key 135 for selecting the upper paper feed cassette 13, and its indicator light (LED) 1.
36, a lower cassette selection key 137 for selecting the lower paper feed cassette 14 and its indicator light (LED) 138, paper size indicators 139, 140 for each cassette. Enlargement specification key 1
43, reduction designation key 142, copy magnification display element (LED
) 141. The enlargement specification key 143 is used to increase the copy magnification by 1% when pressed, and the reduction specification key 142 is used to decrease the copy magnification by 1% when pressed. Also,
In the copy magnification display element 143, there is an enlargement/reduction designation key 143.
The copy magnification corresponding to the operation at 142 is displayed.

FIG. 4 shows an example of the configuration of the drive source for each drive unit 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 change the magnification. A mirror motor 32 is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for performing magnification change. 33 is a scanning motor, which connects the exposure lamp and mirror 5, the mirror 6.
This is a motor for moving 7 for document scanning.

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 28, and the pair of paper ejecting rollers 24. 38 is a paper feed motor, which is connected to the feed roller 15.1.
This is a motor for driving 6. 3 is a paper feed motor, which is a motor for driving one of the pair of registration rollers. 40 is a fan motor, which is connected to the cooling fan 2.
This is a motor for driving 9. Reference numeral 160 denotes a motor 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, and the mirrors 6 and 7 are supported by a second carriage 412, and these carriages 411 and 412 are supported by guide rails 42z and 42.
2, 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, two pulleys 47.47 are rotatably provided on the guide portion 46 of the rail 422 of the second carriage 412 that supports the mirror 6.7, spaced apart in the axial direction of the rail 422. .47, one end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the upper surface fixed 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 4
11 moves, and the second carriage 412 also moves accordingly. At this time, since the pulleys 47, 47 serve as movable pulleys, the second carriage 412 moves in the same direction as the first carriage 411 at 1/2 the speed. still,
1st. I! The moving direction of the two carriages 41t and 412 is
Control is performed by switching the rotation direction of the pulse motor 33.

The first carriage 411 is set at a position that indicates the copyable range determined from the length of the paper P in the feeding direction and the copy magnification in accordance with the paper size of the selected paper feed cassette.

FIGS. 6 and 7 are a perspective view and a plan view showing essential parts of the document placement position display device according to the present invention.

That is, the first carriage 4 is mounted on the document table 2 on the top surface of the main body 1.
A positioning section 61 for aligning one side of the original document is provided parallel to the positioning section 11, and indicators 161 and 162 are provided on the lower surface of the document table 2 along this positioning section 61 to indicate a copyable range. This indicator 161° 162 has an LFD at its tip.
It has a light emitting body 181 such as, and is movable in a direction along the positioning part 61, that is, a direction perpendicular to the moving direction of the first carriage 411. Further, the first carriage 411 that supports the exposure lamp 4 is provided with a scale 62 as an indicator indicating the copyable range on the document table 2 at its upper part (that is, at the bottom of the document table 2). still,
The scale 62 is set at a position corresponding to the copyable range determined from the length of the paper in the feeding direction and the copying magnification according to the paper size of the selected paper feed cassette. A light emitting body 621 such as an LFD is designed to indicate 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 a mechanism for moving both the indicators 161 and 162. The light emitting body 181, which is an example of light emitting means, is attached above the distal ends of the indicators 161 and 162, the first guide shaft 163 is passed through the base end thereof, and the second guide shaft is formed on the lower surface of the distal end. 164 in sliding contact. Furthermore, each indicator 161, 162 has a locking tool 165, respectively.
, 166 are provided, and this locking device 165, 166
a covering portion 1711 of the wire 171 provided between the booths 167 and 170 in parallel to the first guide shaft 162;
They are respectively attached to the M section 1712. The pulley 1
Reference numeral 67 is provided on the motor 160, and the pulley 170 is provided on a holding plate 172 whose one end is rotatably held.

This holding plate 172 is held in place by a coil spring 173 as shown by arrow Z.
A predetermined tension is applied to the wire 171. Thus, depending on the rotational direction of the motor 160, 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 is moved to a position about 10 InIn apart and returned to its original position after exposure is completed. Further, FIG. 9 shows details of the indicator 161 (162) and the light emitter 181 in a perspective view.

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 detects inputs from an operation panel 74 and input devices 75 such as various switches and sensors, such as the cassette size detection switches 31z and 302, and a high-voltage transformer 76 that drives the various chargers, and the static elimination lamp. 28, the blade solenoid 27a of the cleaner 27, the heater 23a1 of the pair of #i marking rollers 23, the exposure lamp 4, and each of the motors 31 to 40 are controlled to perform the above-described copying operation. Among the motors 31 to 40, motors 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 are controlled by the first sub-processor group 72 via a pulse motor driver 79 . The motors 36, 38, 39, and 160 are controlled by the second sub-processor 73 via the pulse motor driver 80. In addition, the exposure lamp 4 is connected to a lamp regulator 8.
The heater 23a is controlled by the main processor group 71 via the heater control section 82. Then, commands to drive and stop each motor are sent from the main processor group 71 to the first and second sub-processor groups 72 and 73. From the second sub-processor group 72, 73 to the main processor group 71, a status indicating the drive or stop state of each motor is sent. Also,
The first sub-processor group 72 receives position information from a position sensor 83 that detects the initial positions of the motors 21 to 34.

FIG. 11 shows an example of the configuration of the main processor group 71. That is, 91 is a run-chip microcomputer (hereinafter simply referred to as microcomputer), which performs key human power detection on an operation panel (not shown) and various display controls 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 human power are connected to the input/output boat 94. 95 is connected to a copy condition setting switch and other human power. Note that the input/output port 96 is an option.

FIG. 12 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 interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 101, it counts based on it, and when it has counted out, the end pulse is sent to the interrupt line of the microcomputer 101. Output to. The timer 102 receives a reference O-clock pulse. In addition, the microcomputer 101 has
Position information from the position sensor 83 is input, and input/output boats 103 and 104 are connected. The input/output boat 104 is connected to the motors 31 to 34 via the pulse motor driver 79. The input/output board 103 is used for outputting status signals of each pulse motor to the main processor group 71, etc.

FIG. 13 shows an example of the configuration of the second sub-processor group 72. That is, 111 is a microcomputer, which is connected to the main processor group 71. Numeral 112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set by the microcomputer 111, it counts based on the set value, 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. In addition, the microcomputer 111 also has an input/output board 11.
4 is connected to the motor 3 via the pulse motor driver 80.
6.38.39,160 are connected.

Fig. 14 shows the control circuit of the pulse motor, and shows the input/output boat 121 (input/output boat 1 in Figs.
04.114> is a pulse motor driver 122
(Equivalent to pulse motor driver 79.80 in Figure 10)
A pulse motor 123 (the pulse motors 31 to 34, 36, 3) is connected to this pulse motor driver 122.
8.39.160) are connected.

Figure 15 shows the speed control method of a pulse motor.
Figure (a) shows the speed curve of the pulse motor, and figure (b) shows the phase switching interval.As is clear from this figure,
At first, the phase switching interval is long, gradually shortens, eventually becomes equal, then gradually increases again, and then stops. In other words, this shows the slew-up and slew-down of the pulse motor, starting from the self-starting region, then using it in the high-speed region,
It will eventually fall. Note that tl, t2, and tx indicate the time of the phase switching interval.

Next, the operation in such a configuration will be explained.

For example, after the power is turned on, the main processor group 71 checks whether the paper P remains on the paper transport path 51 in response to a signal from the switch sensor 75. Then, if there is no remaining, the main processor group 71 detects the detection switch 3
The paper size of the upper paper feed cassette 13 is determined based on the detection signal from 01, and an initialization signal of the optical system 3 and a signal indicating the length Ll of the paper P are output to the microcomputer 101 of the sub-processor group 72 according to the judgment result. do. Then,
The microcomputer 101 drives the motor 33 using the pulse motor driver 79 to drive the first. The second carriages 411 and 412 are moved. As a result, mirror 5
As shown in FIG. 1, if it was at point A just before lRm was turned on, it is moved from point A to point B. Then, the microcomputer 101 operates for a predetermined period of time after the initial position detection signal for the motor 33 is output from the position sensor 83, that is, the scale 6
The scale 62 is moved until the light emitting body 621 (positioned on the scale) on 2 becomes the length of the sheet P in the conveying direction. As a result, the mirror 5 is moved from point B to point 0 as shown in FIG. In addition, the main processor group 71
outputs a signal indicating the width Dp of paper P to the microcomputer 111 of the sub-processor group 73. Then, this microcomputer 11
1 drives the motor 160 via the pulse motor driver 30 so that the distance between the inner sides of the indicators 161 and 162 becomes equal to the width Dρ of the paper P. As a result, if, for example, paper is set in the A4 cassette in the upper stage, the copying range for A4 size paper P is at document table 2, as shown in FIG. 7, and jlt=Lp.

J! 2-Dp, and the user selects the shaded area (J!
tXj! 2) can be instantly determined to be within the copyable range. In addition, the microcomputer 101 is a pulse motor driver 79
The lens motor 31. By driving the mirror motor 32 and the shutter motor 34, the lens, mirror, and shutter are moved to the initial position and to the same magnification position, thereby completing initialization. Further, when the power is turned on, the main processor group 71 turns on the fan motor 40 by driving the motor driver 78, and turns on the heater 23a by controlling the heater control section 82. Then, when the temperature of the heater 23a reaches a temperature that allows fixing, the main processor group 41 displays a message indicating that copying is possible.

Next, in such a state, press the enlarge key 14 on the operation section.
The operation when 3 is pressed and enlarged copying is instructed will be explained. The main processor 71 first processes the display element 1.
41, the magnification rate M% is displayed. Next, the size LP of the paper P is determined by the output signal of the A4 cassette size detection switch 301.

Dp is determined, and a signal determined from the enlargement ratio M% and the length Lp of paper P is output to the microcomputer 101. This signal is a signal that moves the contour line 611 of the scale 61 to a position of 11=LρX(100/M). 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 outputs a signal determined from the enlargement ratio M% and the width Dp of the paper P to the microcomputer 111. This signal is a signal that moves the indicators 161 and 162 to a position of 12 = DP x (100/M). 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 arrow W and x directions shown in FIG. 7 in this example. In this way, scale 61. Indicator 161.162 above j! t,
J! FIG. 16 shows the state in which it has moved to the 2nd position. In this state, the hatched area (J!t Therefore, the user can instantly determine that this area indicates the copyable range. Next, the main processor 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 the arrow Y shown in FIG. At the same time, the mirror motor 3.2 is also moved 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 rate N% on the display element 141. Next, in order to adjust the lens to the reduction 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 described above, the first carriage 411. Indicator 16
1.162 in the directions of arrows R, S, and T shown in FIG. 16, respectively, and jet-LpX (100/
M) Move to the position where 12-DρX(100/M). This state is shown in FIG. Therefore, the user can instantly determine that the illustrated oblique part (j!tXj!2) indicates the copyable range.

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

Further, the driving order of the first carriage 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
This is to prevent the mirror 6.7, which moves in conjunction with the carriage 411, from colliding with the lens 8.

Then, as described above, case 62. 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
To prevent this from appearing as an image, as shown in Figure 18,
The document table 2 is moved to the limits on both sides, and the first carriage 41
1, it is moved to the home position. Then, the microcomputer 101 drives the motor 33 to drive the first. The second carriage 411, 412 is made to travel. At this time, the main processor group 71 controls the exposure lamp 4 to turn on. As a result, the light from the exposure lamp 4 is irradiated onto the original. The reflected light from this original reaches the mirror 9 via the mirror 5°6.7 and the variable magnification lens block 8.
The light is reflected by this mirror 9 and guided to the photosensitive drum 10. As a result, an electrostatic latent image of the document is formed on the photoreceptor drum 10, and as the photoreceptor drum 10 rotates, this electrostatic latent image is sent to the developing device 12 and developed. At this time, the paper P in the paper feed cassette 14 is taken out, and the registration roller 1
The photosensitive drum 10 is sent between the photosensitive drum 10 and the transfer charger 20 via the photosensitive drum 9 . Here, the image on the photosensitive drum 10 is transferred onto the surface of the paper P by the action of the transfer charger 20, and is peeled off by the action of the transfer 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 17.
It is returned to the set position as shown in the figure.

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 original platen 2, and returned to the predetermined set position upon completion of copying.

According to the above embodiment, the indicators 161, 162 and the scale 62 are moved according to the selected paper size and the set magnification, and thereby the copyable range is displayed on the document table 2. Since the user can easily check the copyable range, not only can copying errors be prevented, but also the light emitters 181, 181.62t are lit on the indicator 161, 162 and the scale 62. Therefore, depending on the document placed on the document table 2, the indicator 161°1
Even if 62 and scale 62 are hidden, the light from the light emitters 181, 181, and 621 can be seen through the document, and even in such a case, copying errors can be prevented.

Moreover, conventionally, as shown in FIG. 19(A), the indicator 16
1 (162), which caused parallax during visual confirmation. is the 19th
As shown in Figure (B), the above-mentioned parallax does not occur and the copyable range is accurately i! can be understood.

FIGS. 20 to 23 show main parts of another embodiment of the present invention.

First, if the light emitting body 181 is made into a rectangular shape as shown in FIGS. 20 and 21, the light emitting area can be increased, so that the document placement position, that is, the image forming area can be displayed more accurately. can.

Furthermore, as shown in FIG. 21, a plurality of light emitters 621 can be erected on the scale 62.

Furthermore, the light emitting means is the indicator 161, 16 as in the above embodiment.
The structure is not limited to the structure in which the light emitting body 181 is provided at the tip of 2,
As shown in FIG. 22, a light emitter 181 may be provided in the inner part of the indicator 161 (162), and the light from the light emitter 181 may be guided upward to the tip of the indicator 161 (162) by a mirror 182. . In particular, by doing so, the tip of the indicator 161 (162) can be made smaller.

Further, as shown in FIG. 23, from the light emitter 181 to the mirror 1
A collimating lens 183 may be interposed on the optical path leading to the light source 82, and in particular, since scattering of light can be prevented, it is possible to use a small light emitting body with a small amount of light.

Further, in the above embodiment, the case where the present invention is applied to a copying machine with a fixed 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.

Further, in the above embodiment, the document placement reference is set at the center of the document table, but the reference may be placed at one side of the document table. In that case, one of the indicators 1 located on the reference side
61 or 162 can be abolished.

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

[Effects of the Invention] As is clear from the detailed description above, the document placement position display device of the present invention is provided with a light emitting means on the indicator, so when the document is placed on the document table and the indicator is illuminated by the document. Even if it is hidden, the light can be seen through the document, so the area indicated by the indicator can be accurately recognized. Furthermore, since the lower surface of the document table is backlit by the light emitting means, the document placement position can be accurately recognized without parallax.

[Brief explanation of the drawing]

FIG. 1 is a sectional view schematically showing an image forming apparatus to which an embodiment of the present invention is applied, FIG. 2 is a diagram for explaining the open/closed state, and FIG. 3 is a plan view showing the configuration of the operation panel. FIG. 4 is a perspective view showing an example of the configuration of the drive section, FIG. 5 is a perspective view schematically showing the moving mechanism of the optical system, and FIGS. 6 and 7 show essential parts of an embodiment of the present invention. A perspective view and a plan view, FIG. 8 is a perspective view showing the moving mechanism of the indicator, FIG. 9 is a perspective view showing details of the indicator and the light emitter, FIG. 10 is a configuration diagram of the overall control system, and FIG. FIG. 11 is a configuration diagram of the main processor group, FIG. 12 is a configuration diagram of the first sub-processor group, FIG. 13 is a configuration diagram of the second sub-processor group, and FIG. 14 is a schematic configuration diagram showing the control circuit of the pulse motor. , FIG. 15 is a diagram for explaining the speed control method of the pulse motor, FIGS. 16 to 18 are explanatory diagrams of the operation of the document placement position display device, and FIGS. 19 (A) and (B) are respectively Figures 20 to 23, which are diagrams for explaining side effects of the present embodiment, are diagrams showing essential parts of other embodiments of the present invention. 2... Original table, 62... Scale (indicator), 62
1... Luminous body, 161.162... Indicator, 181
... Luminous body, 182 ... Mirror, 183 ... Collimating lens. Figure 6 Figure 18 Figure 19 +61 (+62) Figure 20 Figure 21 Figure 22! [ +61 (162)

Claims (4)

[Claims] (1) In a device that displays the document placement position by moving an indicator provided under a transparent document table to a predetermined position, the document placement position is characterized in that the indicator is provided with a light emitting means. Display device. (2) The document placement position display device according to claim 1, wherein the light emitting means is a light emitting body provided at the tip of the indicator. (3) The document mounting device according to claim 1, wherein the light-emitting means includes a light-emitting body provided in the inner part of the pointer, and a mirror that guides light from the light-emitting body to above the tip of the pointer. Position display device. (4) The document placement position device according to claim 3, wherein the light emitting means includes a collimating lens on the optical path from the light emitter to the mirror.