JPH01213670A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To obtain a distinct copy without an unnecessary shadow regardless of the kind of an original which should be copied by performing copying in page continuous copying and forming desired margins for filing on the end parts of the paper copied in the above-mentioned way. CONSTITUTION:A computation means 68 calculates scanning timings for the edge of the left page and that of the right page of the original from an output 65 from a thick original specification means and an output 65 from a size specification means. A correction means obtains how much the scanning timing of each edge should be deviated, for example, in order to form the left margin for filing based on the timing of each edge calculated by the computation means 68. A light source driving means lights a light source 51 for correcting based on results calculated by the computation means 68 to uniformly expose a photosensitive body so that a part which becomes the shadow in the copy may be removed. Thus, the excellent and distinct copy can be obtained without causing the shadow in the content of the copy.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electrophotographic copying machine, and particularly to an electrophotographic copying machine that biases so-called page continuous copying function and binding margin function.

<Prior Art> Electrophotographic copying machines (hereinafter referred to as "copying machines") have become multi-functional, and copying machines having a page continuous copying function and a binding margin function are being manufactured.

The page continuous copying function in a copying machine refers to the left half A and right half B of a document 1 to be copied, as shown in FIG.
This is a function that allows you to automatically copy the files separately onto separate sheets 2 and 3, respectively.

Also, if it has an automatic duplex function, copying can be done by
It is also possible to separate the front and back sides of one sheet of paper.

In addition, the binding margin function, as shown in FIG. This is a function that allows copying to the right end (or left end) of the paper 6, leaving a band-shaped margin 7 for binding the paper 6 at the left end (or right end) of the paper 6.

Note that some binding margin functions allow the image area 5 to be brought to the top or bottom edge of the paper 6, leaving a margin for binding at the opposite end.

In conventional copying machines, the continuous page copying function and the binding margin function functioned independently. In other words, in conventional copiers, when the page continuous copy mode is selected, the page continuous copy function works, when the binding margin mode is selected, the binding margin function works, and when both modes are selected, the page continuous copy function works. Each function was made to work independently.

Further, as another prior art of interest to the present invention, there is an unnecessary black background removing device described in Japanese Patent Application Laid-Open No. 62-86378. This device is designed to prevent the periphery of the document from rising off the copy table and the raised portion from appearing as a black background in the copied content when copying a book document. To this end, when scanning the edge of a book document, an auxiliary light source is turned on in synchronization with the scanning timing to expose the photoreceptor.

Note that the "book manuscript" used in this specification refers to the following manuscripts. That is, when copying a page spread of a thick book or the like, the center and left and right edges of the book cannot be brought into close contact with the copy stand and may rise slightly. In this manner, a document to be copied in which the center and both left and right edges partially rise above the copying table will be referred to as a "book document."

Furthermore, this specification uses the term "sheet original" as a term corresponding to the book original. In this specification, the term "sheet original" refers to an original whose entire surface can be brought into close contact with a copy table during copying.

<Problem to be solved by the invention> Of the two conventional examples mentioned above, the former copying machine has the following problems:
Since both the page continuous copying function and the binding margin function work independently, there are the following problems.

It is placed on the copy table 8 as shown in FIG.
When a book document 9 is set with the double-page spread in the center and page continuous copying is performed, a band-shaped shadow 12 appears on the left end of the copy paper 10 of the left page, and a thin band-shaped shadow 13 also appears on the right end. In addition, a band-shaped shadow 14 appears on the right end of the copy paper 11 of the right page, and a thin band-shaped shadow 15 also appears at the left end.

By the way, in general, when copying a book manuscript, the copied sheets are often aligned and bound at the right or left end. Therefore, it is necessary to use the binding margin function in conjunction with the page continuous copying function, but if you do this with a conventional copier,
As shown in FIG. 13, the copy paper 11 on the right page has the shadow 14 on the right edge (see FIG. 12) removed, resulting in a relatively good copy, but on the copy paper 10 on the left page, There is a problem in that the image area 16 of the left page is too far to the right of the paper, and the right end of the image area 16 may be missing.

Next, let's consider the latter technology (unnecessary black background removal device) introduced in the conventional technology section. The technology of the unnecessary black background removal device is a technology for removing black backgrounds (shadows) that occur in the copied content, so black shadows 12, 13, . 14 and 15 can be removed. However, that alone does not mean that a binding margin can be created on the copy paper 10.11 of each left page and right page that are continuously copied.

As described above, with the conventional technology, it has not been possible to make good copies using the page continuous copying function and to create a binding margin at one end of the copied paper.

Therefore, it is an object of the present invention to provide a copying machine that can make copies by continuous copying of pages and create a desired binding margin at the edge of the copied paper at the time of copying, and also allows the type of original to be copied to be changed. To provide a copying machine capable of making clear copies without unnecessary shadows.

Means for Solving the Problems> This invention scans an original to be copied with illumination, develops a photoreceptor on which an electrostatic latent image is formed by being exposed to the scanning light with toner, and transfers the toner image onto a sheet of paper. It is an electrophotographic copying machine that uses a transfer method, and has a page continuous copying function that allows the left half and right half of the original to be copied to separate sheets of paper or the front and back sides of a single sheet of paper, respectively, and a copy area. In the device having a binding margin function that allows copying to be performed by placing the copy at one end of the paper and leaving a band-like margin at the other end of the paper, a thickness original specifying means outputs that the original to be copied is a thick original; size specifying means for outputting the size of the document to be copied; continuous copying mode specifying means for outputting that the copy mode is a mode for performing the page continuous copying function; and in response to the output of the continuous copying mode specifying means. , a calculating means for calculating the scanning timing of the leading edge or the trailing edge of the left page and right page of the original to be copied from the output of the thickness original specifying means and the output of the size specifying means; and a mode in which the copy mode performs the binding margin function. a binding margin mode specifying means for outputting a binding margin content setting signal at that time; and a correction means for correcting the calculation result of the calculation means in response to the output of the binding margin mode specifying means; a paper feeding device that feeds paper onto which the toner image is to be transferred to a photoconductor; a correction light source that is provided to be able to expose the photoconductor; and driving the paper feeding device based on the output of the correction device. An electrophotographic copying machine characterized by comprising: a paper feed drive means; and a light source drive means for driving the correction light source based on the output of the calculation means.

Further, when the calculation result of the calculation means is output and there is no output of the correction means, the sheet feeding driving means drives the sheet feeding means based on the calculation result of the calculation means, It is an electrophotographic copying machine.

Function> The calculation means determines the leading edge (or trailing edge) of the left page of the original from the output of the thickness original specifying means and the output of the size specifying means.
and calculate the scanning timing of the leading edge (or trailing edge) of the right page. Furthermore, the correction means determines how much the scanning timing of each leading edge (or trailing edge) should be shifted in order to create a left binding margin, for example, based on the timing of each leading edge (or trailing edge) calculated by the calculation means. seek. That is, in order to create a left binding margin, the time to shift the scanning timing for the left page and the time to shift the scanning timing for the right page are determined.

Then, the light source driving means turns on the correction light source based on the calculation result of the calculation means, and uniformly exposes the photoreceptor to remove the portion appearing as a shadow on the copy. Further, in order to copy each page, the paper feed drive means feeds paper from the paper feed means at the leading edge scanning timing corrected by the correction means.

Furthermore, even when copying is performed using only the page continuous copying function without using the binding margin function, the sheet feeding drive means operates based on the calculation result of the calculation means, so that copies without shadows can be obtained.

<Embodiments> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a sectional view showing a schematic structure of a copying machine according to an embodiment of the present invention.

The upper surface of the body 31 of the copying machine is provided with a transparent contact glass 33 for setting a document to be copied (for example, a book document 32).

Note that the platen cover that covers the contact glass 33 is omitted in the drawing.

An optical system 34 is provided on the bottom surface of the contact glass 33 of the fuselage 31.
The lower part thereof is partitioned by a partition plate 35, and the lower part thereof is provided with an image forming device 36, a fixing device 37, paper feeding/conveying mechanisms 38a, 38b, 38c, 60, etc. .

The basic operation of this copying machine is as follows.

When the start of a copying operation is instructed, the book original 32 is illuminated and scanned by the optical system 34 . The optical system 34 of this copying machine is of a movable type, and illumination scanning of the book original 32 is performed by turning on a lamp 39 and moving it in the direction of an arrow 40. And book manuscript 3
The light 41 reflected from the lower surface of the lamp 39 is reflected by a reflection m42 that moves integrally with the lamp 39 and a reflection mirror 43.44 that moves following it, is condensed by a lens 45, and is further reflected by a reflection r146. The window 4 formed in the partition plate 35
7 and is irradiated onto the surface of the photosensitive drum 48, exposing the photosensitive layer on the surface of the drum 48.

The photosensitive drum 48 is rotated in the direction of an arrow 49, and around it are a charging charger 50, an eraser 51 as a correction light source, a developing device 52, a transfer/separation charger 53, a cleaner 54, and a static elimination lamp 55. , are arranged in this order in the rotational direction of the drum.

When the photosensitive drum 48 starts rotating,
The surface of the photosensitive drum 48 is charged to a constant charge by the charger 50, and light 41 from the optical system 34 is irradiated thereon, so that the drum surface is exposed to the contents of the book document 32. Thereafter, the eraser 51 is turned on as required, and the surface of the drum 48 is exposed. eraser 5
Exposure according to No. 1 is performed to remove shadows from the copy contents, as will be described later.

When the photoreceptor drum 48 is exposed to light, electric charge is removed from the exposed portion. Then, the developing device 52 attaches toner to the charged portion (electrostatic latent image) on the drum surface.

In conjunction with this operation, the sheet feeding mechanism 38a starts feeding the sheet taken out from the sheet cassette 56 or 57 or inserted through the manual sheet feeding port 58. A pair of registration rollers 59 provided in the paper feeding mechanism 38a
Accordingly, the timing at which the paper is fed onto the surface of the photosensitive drum 48, that is, the so-called secondary paper feeding timing is set, and the paper is secondary fed at a predetermined timing.

When paper is applied to the surface of the photoreceptor drum 48, the toner attached to the surface of the photoreceptor drum 48 is transferred to the paper by the action of the transfer/separation charger 53.
separated from the surface. Then, the paper is transferred to the conveyor belt 60
The transferred toner is sent to a fixing device 37 and fixed thereon. The paper that has been copied in this way is usually
The paper is discharged to the paper discharge tray 61.

Further, when the mode of the copying machine is double-sided copy mode, the switching claw 62 is switched, and the sheet on which one-sided copying has been completed is sent to the transport mechanism 38c.

In the conveyance mechanism 380, when the paper has completely advanced to the rear end, the paper is reversely fed with the rear end at the beginning, and the paper is sent to the conveyance mechanism 38b. Thereafter, the paper is again fed to the photosensitive drum 48 by the paper feeding mechanism 38a, but at this time the paper is turned upside down.

In this way, this copying machine is provided with the transport mechanisms 33c, 38b, the switching claw 62, etc. for double-sided copying.

Note that after the paper is separated from the photosensitive drum 48, the toner remaining on the surface of the photosensitive drum 48 is cleaned by a cleaner 54, and the surface charge is completely removed by a static elimination lamp 55. Thereafter, the series of operations described above are repeated.

FIG. 4 shows the optical system 3 in the copying machine according to this embodiment.
4 is an illustrative diagram showing the optical path of the light 41 passing through the reflector 41 viewed from above, and showing the bending at the reflecting mirrors 42, 43, and 44.

From this FIG.
It can be seen that by moving in the 0 direction, the lower surface of the original 32 is sequentially illuminated and scanned.

On the optical path of the light 41 reflected from the bottom surface of the book manuscript 32,
A light receiving element 63 whose direction of light entry is regulated by a hood 64 is placed in a position where it does not interfere with the light 41 entering the lens 45.
is located. The light receiving element 63 detects a change in the amount of light reflected on the lower surface of the book original 32 when the book original 32 is illuminated and scanned.

FIG. 5 is a diagram showing the relationship between the light receiving output 65 of the light receiving element 63 and the book original 32. As shown in FIG. When the book manuscript 32 is viewed in the scanning direction 40, there is a raised area 30a at the left end of the left page, a left page image area (portion that is in close contact with the contact glass 33 (see FIG. 3)) 66a, and a raised area 30c1 on the right side of the left page. The image area 66b of the page and the raised area 30b at the right end of the right page are arranged in order, and the arrangement is uniform in the direction perpendicular to the scanning direction 40. The light-receiving output 65 of the light-receiving element 63 changes clearly corresponding to the boundaries of each area of the book original 32, and reaches a substantially constant large value at each raised area 30a, 30c, and 30b. It has become.

Therefore, the type of document (
In this case, it must be book manuscript 32. )・Size of document (represented as time data), image area 66a, 6
6b, the scan start timing, scan time, etc. can be calculated.

In this embodiment, the contact glass 33 (see FIG. 3)
When setting the book original 32 on top of the book original 3
2 to a predetermined position (for example, the position is displayed near the contact glass 33). Therefore, the light reception output 65 obtained when the set book original 32 is illuminated and scanned causes the image area 66a to be expanded from the start of the illumination scan.
Scanning time T until scanning begins Scanning time T for image L area 66a on the left page Scan start timing and scanning time T 1 for image area EL area 66b on the right page
Scanning R of the raised area 30b at the right end of the right page Scanning time T from the start of scanning (that is, the end of scanning of the image area 66b) to the illumination scanning completion position Scanning time T of the left page R Scanning of the right page side Time 1゜T work etc. can be calculated.

This calculation is performed on the lamp 39 prior to copying the original 32.
is pre-scanned, and changes in the light 41 at that time are detected by the light receiving element 63.
This can be done by detecting.

If pages of the book original 32 are continuously copied based on the data TT L'EL"ER' TR5T1 thus obtained, copies without black shadows can be made as shown in FIG. 6.

This is because, when copying the left page of the book original 32, if the timing of the secondary paper feeding of the copy paper is delayed by a time T, copying will start from the leading edge of the image area 66a on the copy paper. This is because when the time T has elapsed, the eraser 51 is turned on to remove the charge in the unnecessary area.

In addition, when copying the right page, the timing of the secondary paper feeding of the copy paper is advanced by the time TR, and furthermore, the timing of the secondary paper feeding of the copy paper is advanced by the time TR, and the time T'-(T
+TR), if the eraser 511 ER is turned on, a shadow-free copy can be obtained.

The same procedure can be used when copying both the left and right pages onto the front and back sides of a single sheet of paper by continuous page copying.

In addition, when the binding margin function is used in addition to the page continuous copying function described above, based on the leading edge scanning timing of each image area 66a, 66b, only the binding margin is set, and the timing of the secondary paper feeding and the lighting of the eraser are also adjusted. If the timing is shifted, a shadow-free binding margin 75 as shown in Figure 7 will be created.
A copy can be made with

Next, referring to FIG. 1, the exposure of the photoreceptor drum 48 and the
The relationship with the timing of the next paper feed will be specifically explained.

The light 41 reflected at the exposure start position on the document surface is reflected v
L42.43.44.46 Te reflection tLT-1 Until the position where the surface of the photoreceptor drum 48 is irradiated, that is, the exposure position P1 of the photoreceptor drum reaches the transfer position P2 opposite the transfer/separation charger 53. Let T-r be the time, and let TLED be the time until the exposure position P1 reaches the position P3 facing the eraser 51. Furthermore, using both the page continuous copying function and the binding margin function, EG is the time taken for the leading edge of the paper 67 to reach the transfer position P2 after the secondary feeding is started by the registration roller pair 59 to reach the transfer position P2.
To obtain copies as shown in Figure 7, copy the left page in each case of left binding margin, right binding margin, left binding margin for double-sided copying, and right binding margin for double-sided copying. When copying the right page, the start timing of the secondary sheet feeding relative to the start of illumination scanning may be delayed by the time Ta shown in the table below, and when copying the right page, the time Tb shown in the table below.

(The following is a margin) In the above table, T and TR are the time from the start of scanning to scan the raised area 30a at the edge of the left page and the time from when the raised area 30b at the edge of the right page is scanned to the completion of scanning, as shown in FIG. This is the time until. Further, TD is the scanning time required to create the binding margin 75 shown in FIG.

The timing diagram of FIG. 2A will now be described with reference to the table above. Note that the katakana characters in parentheses correspond to the entries in the timing diagram of FIG. 2A.

When copying the left page, the optical motor, which is the drive source of the optical system, starts to rotate in the normal direction, and the eraser 5 rotates accordingly.
1 lights up (a). When the light source frame 76 including the lamp 39 and the reflecting mirror 42 comes to the illumination scanning start position (
(See FIG. 1), a switch (not shown, for example, a photointerrupter switch) is switched by the light source frame 76, and an exposure start pulse is derived (a). In response to this pulse, exposure of the photosensitive drum 48 at the exposure position P1 is started. Time after start of exposure TL + TLED
During this period, the eraser 51 is turned on, and the portion of the image area 66a (see FIG. 6) on the left page up to the start of exposure becomes a white background. In addition, here, by T,
The physical distance between the exposure position PIED and the light irradiation position P2 by the eraser is compensated.

Further, the eraser 51 is turned off for a period of time EL while the image area 66a of the left page is exposed, that is, for a time T, and is then turned on again (O).

Secondary sheet feeding is started after a time Ta delay from the exposure start pulse (1). This time Ta is the time shown in the table above. Thereafter, when time T1 has elapsed since the exposure start pulse, the light source frame 76 finishes illumination scanning of the left page, so the optical motor stops normal rotation (power). Then, the secondary paper feeding stops when the paper feeding is completed.

Although not shown in FIG. 2A, the optical motor is then reversed to return the light source frame 76 to the initial position to start scanning.

When copying the right page by page continuous copying, the eraser 51 is already lit when the optical motor starts rotating forward (g). Then, the light source frame 76 comes to the illumination scanning start position, an exposure start pulse is output (e), and the eraser 51 turns off after a time of (2T-TER-TR) ten TLEDs (e). As a result, shadows caused by the central raised portion 30c and the like in FIG. 6 are eliminated. The turn-off time of the eraser 51 is determined by the image area 66b (
(See Figure 6) is the scanning time T, after which the ER lights up again.

Note that the time T is the same as above, the exposure position ED This takes into consideration the distance between position P1 and position P3.

Also, the reason for 2T1 is that the light source frame 76 starts illumination scanning from the illumination start position, and starts illumination scanning of the right page after scanning the left page, so it is necessary to add the scanning time T1 of the left page. It is from.

Secondary paper feeding starts after a time delay of T1+Tb from the exposure start pulse (c). The reason why time T1 is added here is that, like the above-mentioned lighting time of the eraser 51, since the right page is scanned after the left page is scanned, it is necessary to delay the secondary paper feeding by that amount. .

Further, the optical motor stops with a delay of 2T1 from the exposure start pulse, and then the optical motor rotates in reverse to return the optical frame 76 to its initial position. Further, the secondary paper feeding ends when the paper feeding is completed.

In the above case, if the original is a sheet original rather than a book original, as shown in Figure 6, there will be no shadow on the left edge of the left page or the right edge of the right page, so the T
- image area 66 at TR-0 and shown in FIG.
The scanning times "EL" and "TER" of a and 66b are respectively the net scanning time of the document 1 "T""
Since T time and time color match, it is sufficient to set "EL ER1".

In addition, when executing only the page continuous copying function, it is sufficient to set the margin scanning time required for the binding margin to "rD-0", and the values shown in the table above can be changed regardless of the type of original or copy mode. Exactly the same copy control is sufficient.

In this embodiment, the eraser 51 is arranged downstream of the exposure position P1 of the photoreceptor drum 48, but as shown by the dotted line in FIG. The exposure position of the drum 48 may be upstream of iP1. In that case, the timing of turning on/off the optical motor, the exposure start pulse, the secondary paper feed, and the eraser may be as shown in FIG. 2B.

It should be noted in FIG. 2B that the exposure start pulse ED needs to be derived by a time T 2 earlier than the light source frame 76 reaches the illumination scan start position. This can be easily done, for example, by devising the arrangement position of the switch for deriving the exposure start pulse.

The other points in the timing chart of FIG. 2B can be easily understood from a comparison with FIG. 2A, so a detailed explanation will be omitted here.

Next, the configuration and operation of the control circuit that executes the contents described above will be explained.

FIG. 8 is a block diagram showing the configuration of the control circuit of this copying machine.

Referring to FIG. 8, the control circuit is equipped with a CPU 68 as a center of calculation and control, and the CPU 68 is equipped with a ROM 69 in which operating programs are stored, and a read/write RAM 70 that serves as a work memory and other functions. There is.

The CPU 68 also controls the lamp 39, the optical motor 71,
Fixing heater 77 of fixing device 37 and eraser 51
These elements and mechanisms are controlled by giving control signals to them.

Further, various data are input to the CPU 68 from a keyboard 72 including a page continuous copy key, a binding margin key, etc., and various switches 73 provided in the internal mechanism are inputted to the CPU 68.
(In this switch type 73, for example, the light source frame 7
6 (see figure m1) reaches the illumination scan start position, and is provided in connection with the switch (already explained) for deriving the exposure start pulse and the pair of registration rollers 59 (see figure 3). Contains detection switches, etc. ) is also given a signal. Furthermore, as explained in FIG. 4, the light receiving output 65 of the light receiving element 63 read during pre-scanning is given, converted into a digital signal, and processed.

9A and 9B are flowcharts for explaining the operation of the control circuit shown in FIG. 8.

Next, along the flow of FIGS. 9A and 9B, and
The operation of this control circuit will be explained with reference to the drawings described above as necessary. In addition, the katakana written in parentheses on the left shoulder of the flowchart is the 2nd A.
It represents the timing of the figure.

Let us consider a case where copying is performed in page continuous copying mode and using the binding margin function. When the CPU 68 receives a copy start command (step S1), as shown in FIGS. 4 and 5, the CPU 68 turns on the lamp 39, performs pre-scanning, and reads necessary document data (step S2). .

The required manuscript data includes the manuscript type (
(book manuscript or sheet manuscript), manuscript size T. In the case of a book manuscript, the scanning time ratio (position, ERL) between the image area and the shadow area 1.

T, T TR) etc.

Next, the CPU 68 executes the calculations in step S3 and step S4 based on the data read in the pre-scan. Operation in step S3 (T − T
)+TL represents the scanning start timing of the leading edge of the image area 66a of the left page when copying the left page during continuous page copying.

Furthermore, the calculation in step S4 (T −T
)-TR indicates the end timing of scanning the trailing edge of the image area 66b of the right page in continuous page shooting T REG . The data calculated in step S3 and step S4 are tentatively calculated as Ta- and Tb-, respectively.
It is stored in the RAM 70 as .

Next, step S5. S8. In SIO and S12, the CPU 68 uses the binding margin function to determine which type and how many binding margins are set. The type of binding margin and binding substitution in the binding margin function can be freely input using, for example, the binding margin key on the keyboard 72 (see FIG. 8). The CPU 68 performs the following operations depending on the determined binding margin type and binding substitution.
Perform the corresponding operation.

For example, if a left binding margin is set and the binding substitution is TD in terms of scanning time, as shown in steps S6 and S7, the data Ta- and Tb- are corrected by the binding substitution TD, and are again stored in the RAM 70 as Ta- and Tb''.

Similarly, in the case of right binding margin, the correction calculation in step s9 is performed, and in the case of left binding margin for double-sided copying (step 510),
If the correction calculation in step S11 is for double-sided copying and right binding margin (step 512), the correction calculation in step 813 is performed.

Note that if the binding margin function is not selected, control moves from step S12 to 814.

Then, the results of the correction calculations Ta” and Tb′ obtained are as follows:
They are formally stored in the RAM 70 as Ta and Tb (step S14, 515). As a result, the secondary sheet feeding delay times Ta and Tb corresponding to the types of binding margins shown in the table described above are determined.

Next, the CPU 68 turns on the eraser 51 (step 516), starts normal rotation of the optical motor 71 (step S17, timing (a) in FIG. 2A), and causes the paper feeding mechanism 38a to start primary paper feeding (step S17, timing of (a) in FIG. 2A). Step 51
8). The primary paper feed means copy paper is fed into the paper cassette 56.
57 etc., and convey it to the registration roller pair 59.

When the primary feeding of paper is completed, the light source frame 76 is at the illumination scanning start position, and it is determined that there is an exposure start pulse (step S19, timing (a) in FIG. 2A), the CPU 68 starts the timer. 1 (step 520). This timer 1 is a so-called soft timer and is created on a program. Of course, this timer 1 may be a hard timer instead of a soft timer.

Next, in step S21, the CPU 68 determines whether to copy the left or right page, and if the left page is to be copied, the process proceeds to step S22, where timer 1 started in step S20 reaches T L +"LED. Wait until the time is reached, and turn off the eraser 51 (step 82).
3. Timing in Figure 2A).

Next, the CPU 68 starts timer 2 (step 524), and starts measuring the scanning time T of the image area 66a of the left page (see FIG. 6). Here, timer 2 is also a so-called soft timer, but it can also be a hard timer.

Next, when timer 1 reaches time Ta (step 525
), the secondary paper feeding is started (step 826, timing (1) in FIG. 2A).

When timer 2 measures time TE in step S27, the eraser 51 is turned on (step S28, timing (e) in FIG. 2A), and when timer 1 reaches T1 (step 529), optical motor 71 is turned on. To stop the rotation, step S30. (timing of force) in FIG. 2A), the motor 71 is reversed to return the optical system (step S31).

In the next step S32, the CPU 68 determines whether double-sided copying is to be performed, and if it is not double-sided copying, the copied paper is ejected to the output tray 61 (step 833).
If it is double-sided copying, the switching claw 62 is changed and the copied paper is guided for double-sided copying by the transport mechanisms 38c and 38b (step 534). In other words, the transport mechanism 38c,
The paper reversely fed by the paper feeding mechanism 38a is primarily fed again to the pair of registration rollers 59. The subsequent control operations are again from step S17.

That is, start illumination scanning (step 517,
2A), performs the primary sheet feeding (step 518), waits for the exposure start pulse (step S19, ff12A timing (g)), and resets timer 1 (step 518). 520).

In the next step S21, when the CPU 68 determines that the right page is to be copied instead of the left page, in step S3
Proceeding to step S20, timer 1 starts at step S20.
Determine whether the time (2T - T -T ) I ERR +TLED is reached (step 535)
. In response to the timer 1 measuring this time, the CPU 68 turns off the eraser 51 in step S3.
6. (timing (i) in FIG. 2A), timer 2 is set to suit (step 537).

Next, wait for timer 1 to reach time T1+Tb (step 538), and start secondary paper feeding (step S
39, timing of (g) in Figure 2A). Then, when the timer 2 reaches time T (step 540), the eraser 51 is turned on (step S41, timing shown in FIG. 2A).

Next, wait until timer 1 measures time 2 T 1, that is, until the illumination scan of the right page ends (step 542), and after stopping the forward rotation of the optical motor and stopping the optical system (step S43, 2A), the optical motor is reversed to return the optical system (step 544).

Then, after waiting for the copied paper to be ejected to the ejection tray 61 (step 545), the eraser 51 is turned off (step 546), and the machine is stopped (step 547).
), the control operation is complete.

Note that if the original is a sheet original, as described above, T and TR in step S3 and step S4 are
becomes 0, the total 11 PJ time T by timer 2 in step S27 becomes T, and the time T measured by timer 2 in step S40 becomes T.
become.

R1 In the above embodiment, the type and size of the original to be copied are obtained by pre-scanning the original before starting exposure, but these data can be manually input by the operator from the keyboard 72 (see FIG. 8). You may also do so. Then, pre-scanning is not necessary.

Further, in the embodiment, a type of copying machine with a moving optical system has been described, but the present invention can be similarly applied to a type of copying machine with a fixed optical system and a moving document table.

<Effects of the Invention> As configured as described above, according to the present invention, regardless of the type and size of the original, copies can be made using not only the normal copy mode but also the page continuous copying function and the binding margin function. Even in the case of copying, there is an effect that good and clear copies can be made without causing shadows on the copied contents.

In particular, when using both the page continuous copying function and the binding margin function, the inconveniences of conventional copying machines have been resolved.
A desired binding margin can be created at a desired position while continuously copying pages.

4. Brief Description of the Drawings FIG. 1 is a diagram illustrating the operating principle of an electrophotographic copying machine according to an embodiment of the present invention, and shows the positional relationship of each mechanism.

FIG. 2A is a timing diagram showing the on/off timing relationship of the optical motor, exposure start pulse, secondary paper feed, and eraser in this embodiment.

FIG. 2B is a timing diagram showing the on/off timing relationship of the optical motor, exposure start pulse, secondary paper feed, and eraser when the eraser 51 is placed upstream of the exposure position P1.

FIG. 3 is a sectional view showing a schematic structure of an electrophotographic copying machine according to an embodiment of the present invention.

FIG. 4 is a plan view of the optical path within the optical system of this copying machine.

FIG. 5 is a diagram showing the relationship between the light reception output signal detected by pre-scanning and the book original.

FIG. 6 is a diagram showing the relationship between a book original and a copy when continuous page copying is performed according to this embodiment.

FIG. 7 is a diagram showing copying using the binding margin function and continuous page copying according to this embodiment.

FIG. 8 is a block diagram of a control circuit of an electrophotographic copying machine according to this embodiment.

9A and 9B are flowcharts for explaining the operation of the control circuit of FIG. 8.

FIG. 10 is a diagram for explaining the page continuous shooting function.

FIG. 11 is a diagram for explaining the binding margin function.

FIG. 12 is a diagram when pages of a book manuscript are continuously copied using a conventional electrophotographic copying machine.

FIG. 13 is a diagram showing the copying result when a conventional electrophotographic copying machine performs continuous page copying and also operates the binding margin function.

In the figure, 32...Original, 34...Optical system, 39
... Lamp, 41 ... Light or optical path, 48 ... Photoreceptor drum, 51 ... Eraser, 59 ... Registration roller pair, 63 ... Light receiving element, 65 ... Light receiving output, 6
6a, 66b...Image area, 68...CPU.

Claims (1)

[Claims] 1. Scan the original to be copied with illumination, and Exposure to scanning light to form an electrostatic latent image The photoreceptor is developed with toner, and the toner is Electrophotographic copying that transfers images onto paper the left half of the original to be copied. and the right half, respectively, on separate sheets of paper or copies the front and back of one sheet of paper separately. Continuous page copy function and copy area area to one edge of the paper and the other edge of the paper. Binding that allows copies to be made with band-like margins In those equipped with alternative functions, If the original to be copied is thick Thickness document specifying means that outputs that and, Output the size of the original to be copied. size identification means, Copy mode uses the page continuous copying function. Continuous shooting that outputs the mode to be used mode identification means; Responding to the output of the continuous shooting mode specifying means Then, the output of the thickness original specifying means and From the output of the leading edge of the left and right pages of the original Or calculate the scan timing of the trailing edge calculation means; Copy mode performs the binding margin function described above. mode and when The binding margin that outputs the binding margin content setting signal. mode identification means; In response to the output of the binding margin mode specifying means. and correct the calculation result of the calculation means. a correction means for The paper to which the toner image is transferred is placed on the photoreceptor. a paper feeding means for feeding paper to the A repair is provided to enable exposure of the photoreceptor. A normal light source, Based on the output of the correction means, the a paper feed drive means for driving the paper feed means; Based on the output of the calculation means, the a light source driving means for driving a correction light source; An electrophotographic copying machine comprising: 2. Electrophotographic copy as set forth in claim 1 It is a machine, A calculation result of the calculation means is output, When there is no output from the correction means, the paper feed The driving means is based on the calculation result of the calculation means. and driving the paper feeding means. An electrophotographic copying machine.