JPS62116930A - Electronic copying machine - Google Patents

Abstract

PURPOSE:To increase a copying speed and to eliminate miscopying operation by providing a main device body with an optical system above an original platen in an oscillatory state, and starting copying operation after detecting whether or not the optical system is closed on the main device body. CONSTITUTION:The optical system 36 is provided with a movable source 38, movable mirrors 42, 44, and 46, a zoom lens 48, etc., for scanning the original surface of an original over exposure, and supported in a free opening/closing state around a shaft 34 to and from the main device body. The original is placed on an original platen in a box type original table 14 with the original surface up and contacts a transparent original presser 22 with the elastic force of a coil spring 16. A reflection type photointerrupter 1 is mounted on the top surface of the original presser 22 nearby its free end and when the optical system 36 is closed to the main copying machine body 12, the photointerrupter 1 outputs a signal indicating that the optical system 36 is closed on the original table 14, so that copying operation is started.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a so-called face-up type electronic copying machine in which a document can be placed on a document table with the surface of the document to be copied facing upward. It is related to.

(b) Conventional so-called face-up type electronic copying machines include, for example, Japanese Patent Laid-Open No. 60-95470 and Japanese Patent Laid-Open No. 60-112.
A proposal has been made that has already been published in Publication No. 026.

The electronic copying machine disclosed in Japanese Patent Application Laid-Open No. 60-95470 is an electrophotographic apparatus that develops a latent image on an image carrier with a developing device, transfers it to a transfer member, and cleans it with a cleaning device after the transfer. A type J characterized in that the object to be copied is arranged below the gravitational direction of an endlessly moving image carrier with the surface thereof facing toward the image carrier, and the transfer member passes through the upper blade of the image carrier. Yes, the manuscript table with all i drafts on it is
The lower part of the image carrier is moved in the horizontal direction.

Furthermore, in the electronic copying machine disclosed in Japanese Patent Application Laid-Open No. 60-112026, a document table on which a document is placed rises upward from the bottom of the main body like an elevator.

(C) Problems to be Solved by the Invention As mentioned above, the electronic copying machine disclosed in Japanese Patent Application Laid-Open No. 60-95470 is of the type in which the document table moves in the horizontal direction. If the document is a heavy book, the main body of the copying machine will vibrate as the document table moves.

Therefore, the copying speed inevitably becomes low.

Furthermore, in the electronic copying machine disclosed in Japanese Patent Application Laid-open No. 60-112026, the document table moves up and down like an elevator, which complicates the structure and takes time to transfer the document.

(d) Means for Solving the Problems The present invention includes a document table on which a document is placed with the surface of the document to be copied facing upward, and a device positioned above the document table to expose and scan the document. Accordingly, in an electronic copying machine equipped with an optical system for projecting and forming an original image on a photoreceptor, the optical system is mounted on the original table with a fulcrum near one end relative to the main body of the apparatus. An electronic copying machine is provided with means for detecting whether or not an optical system is closed on the apparatus main body.

(E) Function In the present invention, the optical system is configured to be able to swing above the document table with one end of the optical system as a fulcrum, so that the surface of the document to be copied on the document table faces upward. When a document is placed, the optical system is closed on top of the document, and a copying operation is started, the surface of the document is copied.

Furthermore, since a means for detecting whether the optical system is closed to the apparatus main body is provided, a signal indicating that the optical system is closed to the apparatus main body is outputted from this detection means. If the copying operation can be started only when the user is present, copying errors will not occur.

(f) Embodiment No. 111A is an illustrative cross-sectional view for explaining one embodiment of the present invention. The electronic copying machine 10 includes a copying machine main body 12, and on the upper surface of the copying machine main body 12, a document table 14 having an opening at the upper end and having a box-like shape as a whole is fixedly provided. A plurality of coil springs 16 are provided inside the document table 14 so that their elastic force acts upward. That is, the lower end of each coil spring 16... is fixed to the bottom plate of the document table 14, and the flexible document placement plate 18 is attached to the upper end of the coil spring 16....

In this way, if the flexible original f/It and the placing plate 18 are supported by the plurality of coil springs 16...
It can handle not only sheet-like originals but also thick originals such as books. That is, if the original 20 placed on the original placing plate 18 is pressed down from above, the original placing plate 18 deforms according to the thickness of the original 20, so that the cover of the original 20 is reduced as shown in FIG. The copy surface, that is, the document surface can be held flat at a predetermined height.

Note that in order to deal with thick originals such as books, in addition to using the coil springs 16 as described above, an elevator member that can move up and down may be used.

A document holder 22 made of a transparent material such as glass, for example, is supported at one end of the upper part of the document table 14 by a shaft 24 so as to be openable and closable.

A light pen (write pen) is placed on the document holder 22.
n) A tablet 28 is provided which can be positioned by 26. The tablet 28 is made of a flexible transparent or translucent sheet member, and as will be described in detail later with reference to FIG. 5, one end of the tablet 28 includes transparent electrodes arranged in a matrix. It is wound around a take-up roller 30, and a grip portion 32 is formed at the other end. As shown in FIG. 2, the tablet 28 is normally wound up by the take-up roller 30 and is fully stored, and is only used by the knob 32 when operating the light bevel 26 to specify the editing position. It is pulled out and hooked onto the end 22a of the yXX presser foot 22. In this way, the tablet 28 constituting the position specifying means can be placed on the document surface of the document 20 only when necessary.

Near the top of the take-up roller 30 is a shaft 3 that serves as a fulcrum.
4 is provided, and an optical system 36 is supported by this shaft 34 so as to be openable and closable in the vertical direction. The optical system 36 includes a document 2.
In order to scan the surface of the original document 0 while exposing it to light, a movable light source 38 as an exposure lamp constituting a part of the scanning means moves from one end to the other end and in the opposite direction as shown in FIG. It is provided movably. In connection with the movable light source 38,
A reflecting mirror 40 having an elliptical cross section is provided. A first movable mirror 42 is fixed to this reflecting mirror 40 . When the movable light source 38 is moved forward by a servo motor (not shown) to the position indicated by the dotted line in FIG. 3, the document 20 whose surface has been flattened by the document holder 22 is subjected to slit exposure. Second movable mirrors 44 and 46 are provided in association with the first movable mirror 42, and these second movable mirrors 44 and 46 send the original image completely reflected by the @1 movable mirror 42 to the zoom lens 48. This is to reflect it again towards the target.

Since the zoom lens 48 is used, the electronic copying machine 10 is configured to be variable in magnification. The pair of second movable mirrors 44 and 46 move in the same direction as the movable light source 38 at a speed equal to the moving speed of the movable light source 38. A fixed reflecting mirror 5o is provided in front of the zoom lens 48 to reflect the original image transmitted through the lens 48 toward the photosensitive drum 52.

A reflective first photo ink printer 1 is mounted on the north surface near the free end of the document holder 22, and the optical system 36
A reflecting plate 2 that reflects the light rays emitted from the first photo ink converter 1 is fixed at a portion corresponding to the first photo ink converter 1 .

As shown in FIG. 3, the optical system 36
2, the photointerrupter 1 outputs a signal indicating that the optical system 36 is closed above the document table 14, and the start of the copying operation is permitted.

A reflective second photo ink bumper 3 is fixed on the lower surface of the document holder 22 slightly closer to the proximal end than near the free end, and corresponds to the second photo ink bumper 3 of the document table 14. A reflector plate 4 that reflects the light rays emitted from the second photo ink converter 3 is attached to the area where the photo ink printer 3 is attached. Note that the operation of this second photo ink converter 3 is similar to that of the first photo ink converter 3.
There is no difference from the photo interrupter 1.

A charging corotron 54 is provided upstream of the exposure position of the photoreceptor drum 52, that is, the position where the original image is formed by the reflecting mirror 50, for uniformly charging the photoreceptor drum 52 with a charge of a specific polarity. It will be done.

A partial erase lamp 56 in which a plurality of LEDs are arranged in a line in the width direction of the photoreceptor drum 520 is provided on the downstream side of the photoreceptor drum 52 from the above-mentioned exposure position, parallel to the axis of the photoreceptor drum 52. The partial erase lamp 56 includes a plurality of LEDs 561 to 561, as shown in FIG. 8 or 9.
It is configured as an LED array containing 56m. As will be described later, such a partial erase lamp 56 is used to partially erase an electrostatic latent image formed on the photoreceptor drum 52 during image editing according to positional information for -collection. used for.

A developing device 58 is provided on the downstream side of the partial erase lamp 56 . The developing device 58 includes a photosensitive drum 52
The electrostatic latent image that has been completely formed is developed using toner.

A paper feed section 60 is formed at one end of the copying machine main body 12, and two paper feed cassettes 62 and 64 are detachably attached to the paper feed section 60 in this embodiment. Paper size sensors 66 and 68 are provided at the leading ends of the paper feed cassettes 62 and 64, respectively. Paper cassette 62
Among the sheets of paper 70 accommodated in and 64, the uppermost sheet is pressed against the paper feed roller 72. Paper feed roller 72
As it is rotated, the pressed paper 70 is taken in one by one in the direction of the register roller 74.

On the downstream side of the developing device 58, a transfer flotron 76 and a separation corotron 78 are integrally provided. When a paper 70 is supplied from the paper feed cassette 62 or 64, the toner image formed on the photosensitive drum 52 is transferred onto the paper 70 by a transfer corotron 76. During transfer by the transfer corotron 76, the paper is completely attracted to the photoreceptor drum 52 and tries to move together with the photoreceptor drum 52, but the paper is separated by the separation corotron 78.
It is transferred in the direction of the vacuum conveyor 80.

A cleaning device 82 is provided along the photoconductor drum 52 on the downstream side of the transfer flotron 76 (upper right side in FIG. Remove residual toner.

Cleaning equipment f! Further upstream of t82, that is, between the charging flotron 54 and the cleaning device 82, a general erase lamp 83 is provided.

The paper separated from the photosensitive drum 52 by the separating flotron 78 is sent to the fixing device 84 by the vacuum conveyor 8o. The fixing device 84 includes a heating roller 86 having a built-in heater and a pressure roller 88 for pressing the paper against the heating roller 86. Therefore, the toner image transferred onto the paper 70 is transferred to the two rollers 8.
6 and 88, heat and pressure is applied to the paper 70.
It will be established. The paper that has been fixed is discharged onto the paper discharge tray 90 by a pair of paper discharge rollers.

Above the vacuum conveyor 80, a photosensitive drum 52 is provided.
A drive motor 81 is provided for rotating the
A control box 92 is formed above the fixing device 84, and electronic components for a control system, which will be described later, are housed within the control box 92.

FIG. 4 is a block diagram showing an example of the control system of this embodiment. The control system includes a CPU 94. This CPU 94 controls the operation of the entire electronic copying machine. The CPU 94 includes a ROM 96 for storing control programs, etc., and a ROM 96 for temporarily storing data when controlling by the CPU 94 and necessary for control. It is connected to a RAM 98 having areas for various flags, a timer area, and a table 99 for a partial erase lamp 56 (FIG. 10, which will be described later). In addition, the CPU 94 has
The aforementioned paper size sensor 6 is connected via the I10 port 100.
6 and 68 are connected, and a position specifying device 102 including a tablet 28 is connected. engineering 10 boats 1
00 is connected to the partial erase lamp 56, and therefore the plurality of LIDs 5 included in the partial erase lamp 56
61 to 56m (FIG. 8 or 9) are controlled to be turned on or off by the CPU 94. A mechanism (for example, a taratch solenoid) for the register roller 74 is further connected to the I10 port 100,
Therefore, the opening/closing and timing of register roller 74 is controlled by CPU 94.

Referring to FIG. 5, tablet 28 is formed by overlapping two translucent sheets 104 and 106.

A plurality of striped transparent electrodes 108...
and 110... are formed to be orthogonal to each other. In other words, the transparent electrodes 108... and 110...
A matrix is formed by the transparent electrode 108.
The arrangement direction of... corresponds to the X axis, and the transparent electrodes 110...
The arrangement direction corresponds to the Y axis. Therefore, by acting the light pen 26 on the tablet 28, the X-axis position and the Y-axis position can be detected. As shown in FIG. 6, each of the transparent electrodes 108... has sequential outputs Ql, Qt, Qs- of the shift register 112.
, Qn-+, Qn are processed with an AND gate together with a clock to obtain a scanning voltage X 1+ X 21 X i *
... is applied as X n-+ + X n. As shown in FIG. 6, each of the transparent electrodes 110... has sequential outputs R1, R2, R of the shift register 114.
t-, Rn-+, Rn are processed with an AND gate together with a clock to generate scanning voltages Ys, Y2+ Yz,
=Yn-+, applied as Yn.

When the light pen 26 is brought into contact with or in close proximity to the tablet 28, a voltage is induced in the light pen 26 by electrostatic induction from the transparent electrodes 108 and 110 directly below the tablet 28, as shown in FIG. The voltage obtained at the light pen 26 is amplified by an amplifier 116, noise is removed by a filter 118, and then subjected to waveform processing by a waveform shaper 120 and input as a pulse signal to latch circuits 122 and 124.

On the other hand, counters 126 and 128 are provided, and these counters 126 and 128 include the shift register 11.
2 and 114 are provided. Therefore, counters 126 and 128
is the output Q 11 of shift registers 112 and 114
It is incremented in synchronization with Q21... and R1, R2.... Latch circuits 122 and 124 receive the outputs of counters 126 and 128. Therefore, as described above, the latch circuit 12
When the pulse output from the light pen 26 is input to 2 and 124, the count values of the counters 126 and 128 at that timing are latched by the latch circuits 122 and 124, respectively, as shown in FIG. In this way, the coordinate position can be specified using the tablet 28 and the light pen 26.

Next, with reference to FIG. 4, the operation of this embodiment will be described based on the flowcharts shown in FIGS. 7A, 7B, and 7C. It should be noted that controls related to ordinary electronic copying machines are well known, and here mainly controls for editing, ie, trimming, masking, and centering will be explained.

Before explaining the operation, with reference to FIGS. 8 to 11,
Each of the trimming mode, masking mode, and centering mode will be briefly explained.

In the trimming mode, as shown in Fig. 8, two designated points Pi (XIIFI) and P2 (X
2), leaving only the portion of the electrostatic latent image corresponding to the rectangular area 130 connecting the two, and erasing the remaining portion of the electrostatic latent image indicated by diagonal lines in FIG. Therefore, in this mode, the plurality of LEDs 561 to 5 included in the partial erase lamp 56
6m is lit only outside this area 130.

In masking mode, as shown in Fig. 9, two designated points Pt (xt, yl) and P2 (xt, y2
> is erased, and only the portion of the electrostatic latent image corresponding to a rectangular area 132 (indicated by diagonal lines in FIG. 9) is erased, and the remaining portion of the electrostatic latent image is left as is.

Therefore, in this mode, the partial erase lamp 56
The plurality of LEDs 561 to 56m included in this area 1
It is lit only within 32.

In centering mode, only one
Only a point is specified, and coordinate data P3 (X3.
Based on F3), when the toner image is transferred to paper, the center of the toner image in the X-axis direction is aligned with point P3. That is, in this mode, the partial erase lamp 56 is not used.
As will be described later, the paper feed timing is controlled by coordinate data and paper size data.

Before starting the copying process, the operator first opens the document holder 22 and places the document 20 on the document placement plate 18 with the document surface facing upward. Then, the document holder 22 is closed. At this time, the original 4112 placement plate 18 is deformed against the elastic force of the coil spring 16, and the original 4112 is deformed.
The surface of the original 0 is made flat.

Then, hold the tab 32 and remove the flexible tablet 2.
8 and place it on the original presser foot 22. Then, as shown in FIG. 1, the user uses the light pen 26 to specify a position on the tablet 28, that is, a position on the document surface of the document 20 to be edited.

An editing mode, ie, trimming, masking, or centering, is selected by a mode selection switch (not shown). In the case of trimming or masking, two points P1 and P2 must be specified, as described above.

In the case of centering, it is sufficient to specify one point P3.

In the first step 311 of FIG. 7A, the CPU 94
determines whether the specified editing mode is trimming or masking. And this step 31
If it is determined in step S1 that the trimming or masking mode is selected, the process advances to step S13, and it is determined whether two points have been indicated by the titpen 26 or not. This is because, in the case of trimming mode or masking mode, coordinate data of two points is always required as described above.

In step S13, if it is detected that two positions on the document 20 have been input as shown in FIG. 8 or 9, the position specifying device 102 including the tablet 28 (
(Fig. 4) is sent to the CPU via the I10 boat 100.
94. That is, in step S15, the CPU 94 activates the latch circuits 122 and 124 (fifth
Load the coordinate data from Figure). These two points P1 (xt
, yl ) and P2 (12°yt) data are R
It is temporarily stored in an appropriate area of AM9+1.

If it is determined in step 913 that there is no input of position data for two points, the CPU 94 displays the message "Please input one more point" on the display section (not shown) in step S17, Alert the operator.

In step S15, two points Pt(xt, yt) and P2(
Once the coordinates of X2, 3F2) are determined, the CPU 94
In step S19, for each of the plurality of LEDs 561 to 56m included in the partial erase lamp 56, when to turn them on and their lighting duration are calculated.

To be more specific, in the trimming mode, as shown in FIGS. 8 and 10, all LEDs 561 to 56m should be lit until the X-axis position x1 is reached, and from the X-axis position x1 to xt. Up to this point, only those corresponding to positions ft y 1 to yt on the Y axis should be turned off, and after position X2 on the X axis, all items should be turned on. In masking mode, as shown in FIGS. 9 and 10,
All LEDs 561 to 56 until the X-axis position x1
m should be turned off, and from X-axis position x1 to xt, only those corresponding to Y-axis positions fly1 to yt should be turned on, and after X-axis position x2, everything should be turned off. Should.

Then, the data of the LEDs to be turned on or off calculated in this way is combined with the time data in step S1.
9, the data is stored in a table 99 (FIG. 4) formed in RAM 98.

If the above-mentioned position data is canceled in the next step 521, the data in the table 99 is cleared in the subsequent step 823, and the process returns to step S13.

If the input is not canceled in step 321, the process proceeds to step S25, and in step 325, the CPU 94 determines whether or not the trimming mode is active. Such a determination is achieved by checking the state of a mode selection switch (not shown) previously operated by the operator.

If it is the trimming mode, the CPU 94 performs step S.
At step 29, time data is set in an on-timer for counting the timing at which the register roller 74 (FIG. 1) should be turned on. The time data set at this time is
This is the same data as in normal copy mode. This is because in the trimming mode (this also applies to the masking mode), unlike the centering mode, there is no need to adjust the paper feeding timing.

If it is determined “No” in the previous step 825,
That is, if it is not the trimming mode, it is the masking mode, and the data set in the table 99 of the RAM 98 in the previous step S19 is inverted. That is, in this masking mode, the partial erase lamp 56
The LEDs 561 to 56m included in the trimming mode are turned on or off in a completely opposite manner to the trimming mode. Specifically, in step S19, the partial erase lamp 5 is turned on.
Although the data of LED 6 and its time has been set in the table 99, this data has been inverted, and therefore, as shown in FIG.
The ED and its time data are set in the table 99.

After normal time data is set in the on-timer for the register roller 74 in step 529, the CPU
94 determines in step 531 whether copying has started, that is, whether a copy button (not shown) has been operated. Then, when the copy button is operated,
The process proceeds to the next step S33.

In step S33, the drive motor 81. for rotating the photosensitive drum 52 is activated. While supplying voltage to the high-voltage circuit for the charging Flotron 54 and the like and the entire erase lamp 83, the paper 70 begins to be conveyed from the paper cassette 62 or 64 toward the register roller 74 by the paper feed roller 72.

Then, in step S35, a certain amount of idling time is counted based on the copying process program built into the ROM 96.

After a certain period of time has elapsed, in the next step S37,
The servo motors for operating the movable light source 38, movable mirror 42, etc. are energized, and the previous step 32 is activated.
The on-timer for register roller 74 set at 9 begins decrementing.

Then, in step S39, if it is determined that a certain period of time has passed in the same way as in step S35, the following step S41
At this time, the timer of the partial erase lamp 56 formed in the RAM 98 starts decrementing based on the time data set in the table 99 of the RAM 98.

Next, in step S43, the previous step S19
Based on the LED data set in table 99,
The CPU 94 lights up the LED that should be lit among the partial erase lamps 56.

In the following step S45, it is determined whether the on-timer for the register roller 74 whose decrement was started in the previous step S37 has timed out.

If the time has expired, the CPU 94 provides a signal to a mechanism for the register roller 74, such as a clutch solenoid, in step S47. In response, the register roller 74 is turned on, and the paper 70 is conveyed toward the photosensitive drum 52 again.

In the next step S49, a jam is checked. If the paper 70 is jammed, a message to that effect will be displayed on the display section and the jam will be cleared.

If there is no jam, in the next step S51, the CP
U94 determines whether the exposure and scanning of the original surface of the original 20 by the movable light fi 38, the movable mirror 42, etc. has been completed.

When the exposure/scanning is completed, in step S53, C
The PU94 includes a charging flotron 54 and a movable light source 38.
Turn off the t source. Then, in step S55, it is determined whether the copying has been completed. If the copying is completed, the process advances to step S59, and if the copying is not completed, the number of copies is counted down in step S57, and the process returns to step S37.

In step S59, it is determined whether or not the paper 70 has been completely discharged onto the paper discharge tray 90. If the paper 70 has been discharged completely,
The copying machine enters a standby state, and if the paper cannot be completely ejected, jam processing is performed in the same manner as in step S49.

Next, in step Sll, if the trimming mode or the masking mode is not selected, that is, if the centering mode is selected, the routine proceeds to the routine shown in FIG. It will be determined whether there is. If there is a point force, the process proceeds to step 361, and if there is no point force, the CPU 94, in step 363, displays the message "Please input the center point" on the display section to call the operator's attention.

In the next step S61, the CPU 94 determines the position tX on the X axis of the point Px (x3.y3) that has been completely input from the latch circuit 122 (FIG. 5) included in the position specifying device 102.
Only 3 is taken into RAM98.

Further, in step 365, the output of the paper size sensor 66 or 68 is sent to the CPU 9 via the I10 boat 100.
4 is input.

Next, in step 367, it is determined whether the position designation has been canceled. If you wish to cancel your input, press C.
In step S69, the PU94 performs the previous step 8.
At 61, the data stored in RAM 98 is cleared and the process returns to step 359.

If there is no cancellation of the input, in step 571,
The CPU 94 stores the position data x stored in the RAM 98.
3 and the size data detected by the paper size sensor 66 or 68, the timing at which the register roller 74 should be turned on is calculated.

Specifically, in the case of normal copying, reflected light 134 is projected from point A to form an electrostatic latent image on the rotating photosensitive drum 52, as shown in FIG. When the photosensitive drum 52 has completed its rotation and the point A reaches the point B, the register roller 74 is turned on, and the paper 70 is conveyed toward the photosensitive drum 52 at that timing. Therefore, in the case of normal copying, the leading edge of the paper 70 coincides with point A at the leading edge of the electrostatic latent image, and the leading edge of the copied image coincides with the leading edge of the paper.

On the other hand, in centering mode, the
The timing at which the register rollers 74 are operated is controlled so that the center in the axial direction coincides with the designated position. In other words, in the centering mode, the copy image is translated in the X-axis direction by advancing or delaying the timing at which the register roller 74 is turned on. That is, as shown in FIG. 11, when the X-axis position x3 of point P3 is translated by a distance d in the X-axis direction, when the point corresponding to the X-axis position x3 coincides with point C in FIG. , the register roller 74 is turned on, and the copied image is then translated by a distance d and placed in the center of the paper. The time t until the point P3 coincides with the point C is calculated by dividing the distance from point A to point B on the circumferential surface of the photoreceptor drum 52 by dividing the length of one sheet 70 by L,
If the peripheral speed of the photosensitive drum 52 is S, it is given by the following equation.

D-L/2+xs However, D≧L/2.

In this way, in step S71, the time t for advancing or delaying the timing of turning on the register roller 74 is calculated. This time t corresponds to the time to start decrementing the on-timer for the register roller 74 set in the previous step S29.

After the time t for adjusting the turn-on timing of the register roller 74 is calculated in step 371, the process returns to step S3L shown in 7th Bm. Step S
The operations after 31 are the same as those in the trimming or masking mode described above, except that in step 837,
The difference is that based on the time t calculated in step S71, decrement of the on-timer for the fully set register roller 74 is started in step S29.

(G) Effects of the Invention In the present invention, a document can be transferred by simply opening and closing (swinging) the optical system ξ on the document table, so that a plurality of documents can be copied in a short time.

Further, since an elevator or the like is not used, the structure is simplified, and a small and inexpensive electronic copying machine can be realized.

Furthermore, since documents can be transferred from the top of the device,
The posture of the worker handling the manuscript becomes comfortable.

Furthermore, since a means for detecting whether or not the optical system is closed on the apparatus main body is provided, a signal indicating that the optical system is closed on the apparatus main body is outputted from the detection means. Otherwise, if the copying operation is prevented from starting, copying errors caused by the optical system not coming into close contact with the document will not occur.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing an embodiment of the present invention. FIGS. 2 and 3 are structural diagrams for explaining the operation or operation of the embodiment shown in FIG. FIG. 4 is a block diagram showing an example of the control system of this embodiment. FIG. 5 is a block diagram illustrating the positioning device of FIG. 4 including a tablet. FIG. 6 is a timing diagram for explaining the operation of FIG. 5. FIGS. 7A, 7B, and 7C are flowcharts for explaining the operation of an embodiment of the present invention. FIG. 8 is an illustrative diagram for explaining the trimming mode. FIG. 9 is an illustrative diagram for explaining the masking mode. FIG. 10 is a diagram showing the relationship between turning on or off of the LED of the partial erase lamp and its time in the trimming mode or the masking mode. FIG. 11 is an illustrative diagram for explaining the centering mode. FIG. 12 is an illustrative diagram for explaining the on-timing of the register roller in the centering mode. 1.3... Photo interrupter, 2.4... Reflector, 10... Electronic copying machine, 12... Copying machine main body, 14
... Original table, 20... Original, 22... Original holder, 34... Shaft, 36... Optical system.

Claims (1)

[Scope of Claims] 1. A document table on which a document is placed so that the surface of the document to be copied faces upward, and a document image is exposed by exposing and scanning the document by being positioned above the document table. In an electronic copying machine equipped with an optical system for projecting and forming an image on a body, the optical system is swingably attached to the apparatus main body above the document table with a fulcrum near one end thereof. Along with being
1. An electronic copying machine, comprising means for detecting whether or not an optical system is closed on the main body of the apparatus. 2. A transparent document holder is swingably mounted between the document table and the optical system, and a means for detecting whether or not the document pressing plate is closed on the document table is provided. An electronic copying machine characterized by: