JPH0264670A - Additional information recording device - Google Patents

Abstract

PURPOSE:To clearly record additional information such as date information and page number information, etc., by providing an erasing means, by which electrostatic load from an unnecessary part is eliminated, so that only an electrostatic latent image of arbitrary image elements are formed when the electrostatic latent image is formed on a photosensitive body surface by an image element latent image forming means. CONSTITUTION:The image element latent image forming means 21, which can form the electrostatic latent image of a large number of image elements on the surface of a photosensitive body 16 is provided near the surface of the photosensitive body 16, and at the same time, in an electrostatic latent image of image elements formed by the image elements latent image forming means 21, only the necessary parts are retained by the effects of the erasing means 19. That is, the erasing lamp 19 is provided with a large number of light emitting diodes 191, 192,..., 19n, which can be instantly lit selectively. Thus, the date information, the page number information, and other additional information can be clearly recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an additional information recording device for a copying device that copies a manuscript using a so-called electrophotographic method, and the present invention relates to an additional information recording device for a copying device that copies a manuscript using a so-called electrophotographic method. The present invention relates to a device capable of recording information and other additional information.

<Prior art> A document is illuminated, and the reflected light exposes a photoreceptor charged to a constant potential to form an electrostatic latent image of the document.The latent image is developed into a toner image and transferred to copy paper. In a type of copying apparatus, there are cases where it is desired to record date information, time information, page number information, magnification ratio information, and other additional information together with the document information recorded on the document.

A conventional example of such an additional information recording device is, for example, one described in Japanese Unexamined Patent Application Publication No. 58-192062. The device described in this publication includes a transmissive liquid crystal display or a transmissive electrochromic display near the surface of a photoreceptor, and forms an electrostatic latent image of additional information displayed on the display on the photoreceptor. It is like that.

Further, JP-A-58-196537 discloses an additional information recording device comprising a mask device for shielding light from a document and an additional information exposure device. The additional information exposure device disclosed herein has a character/figure display panel containing a liquid crystal provided facing the surface of a photoreceptor drum, and a flash lamp equipped with a compound eye lens provided behind the display panel. .

Furthermore, ■Japanese Patent Application Laid-open No. 57-161763,
A date recording device is disclosed which includes a date document device on which a date is printed and which is disposed substantially near a photosensitive drum.

<Problems to be Solved by the Invention> Among the conventional techniques, the devices described in (1) and (2) have a mechanism in which additional information displayed on a transmissive liquid crystal display or a transmissive electrochromic display is transferred onto the surface of a photoreceptor. However, due to the nature of liquid crystal and electrochromic, the contrast of the displayed content is low and the copying acid becomes unclear.

Additionally, in the case of the device described in (■), a large number of date plates with dates printed on them are required, as well as a mechanism to replace the plates each time the date changes, making the device complex and large. There are drawbacks.

Therefore, it is an object of the present invention to provide an additional information recording device for a copying machine that can clearly record date information, page number information, and other additional information, and that can be realized with a relatively simple device configuration. Set the number to 1.

Means for Solving the Problems> This invention forms an electrostatic latent image of a document by exposing a photoreceptor charged to a constant potential, develops the latent image into a toner image, and transfers the toner image to a sheet of paper. This is an additional information recording device for a copying device of a type that transfers images to a pixel, the pixel latent image forming device being provided near the surface of the photoreceptor and capable of forming electrostatic latent images of a large number of pixels on the surface of the photoreceptor. and a means disposed opposite to the surface of the photoreceptor so that only an electrostatic latent image of a given pixel is formed when an electrostatic latent image is formed on the surface of the photoreceptor by the pixel latent image forming means. An additional information recording device comprising: an erase means for removing static charge from unnecessary portions on the surface of the photoreceptor;

In the above-mentioned additional information recording device, the pixel latent image forming means includes: a pixel display sheet whose surface is provided facing the surface of the photoreceptor, and whose portion excluding the pixel display portion is made of a light-transmitting member; and the sheet. illumination means provided on the back side of the sheet and capable of exposing the surface of the photoreceptor through the sheet; and a shielding that blocks light provided from the document for exposing the photoreceptor in conjunction with lighting of the illumination means. It is preferable to include means and.

Further, in the above-mentioned additional information recording device, the pixel latent image forming means includes a pixel display sheet whose surface is provided facing the surface of the photoreceptor and whose portion excluding the pixel display portion is made of a light-transmitting member; A sheet moving means for moving the sheet in accordance with movement of the surface of the photoreceptor may be included.

Effect> The electrostatic latent image of the pixel formed by the pixel latent image forming means is reduced to only the necessary electrostatic latent image by the action of the erase means.

Therefore, arbitrary additional information such as date information, time information, page number information, magnification ratio information, marking, and other information can be expressed by a combination of electrostatic latent images of pixels.

By configuring the pixel latent image forming means with a light-transmissive pixel display sheet, a dedicated illumination means, and a means for blocking exposure light from the original, additional information can be recorded at a desired position. .

Furthermore, by moving a light-transmissive pixel display sheet along with the movement of the photoreceptor surface and allowing exposure light from an original to pass through the sheet, an electrostatic latent image of pixels can be formed by the exposure light. .

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

FIG. 2 is a schematic diagram of a copying machine 1 employing an embodiment of the present invention. First, with reference to FIG.
I will explain the configuration of.

A transparent contact glass 3 for placing a document 13 is provided on the upper surface of the body 2 of the copying machine 1, and a cover 4 that can be opened and closed is provided on the contact glass 3.

Inside the body 2, a lamp 5 for illuminating the document and a document 1 are installed.
An optical system 12 having reflecting mirrors 6° 7.8 and 9 and a condensing lens 11 is provided for guiding the light reflected by the 3rd grade.

The lamp 5 and the reflector 6 are integrated into a unit, and the lamp unit 10 is movable in the direction of arrow A1, and can sequentially illuminate and scan the document 13 placed on the contact glass 3 from the leading edge to the trailing edge. . At this time, the light reflected by the original 13 is reflected by the reflecting mirrors 7 and 8, which follow the lamp unit 10 and move in the direction of the arrow A1 at about half the moving speed of the lamp unit 10, and is focused. This is a mechanism in which the light is guided through a lens 11 to an image forming mechanism 15, which will be described later, by a reflecting mirror 9.

Note that, instead of moving the optical system 12, the contact glass 13 and the cover 4 may be slid with respect to the body 2.

Furthermore, a scan start position detection switch 14 is provided in conjunction with the lamp unit 10. The scan start position detection switch 14 is turned on at the timing when the lamp unit 10 illuminates the leading edge of the document 13.

The light guided by the optical system 12 is applied to an exposure position Ex of a photosensitive drum 16 that constitutes an image forming mechanism 15.

The image forming mechanism 15 includes a photoreceptor drum 16 as a center and a charger 18 arranged around the photoreceptor drum 16 in order, an erase lamp 19 as an erase means, a developing device 20 . It includes a transfer charger 22, a peeling charger 23, a cleaner 24, and a static elimination lamp 25. Further, a pixel latent image forming device 21 is provided between the exposure position Ex and the erase lamp 19.

During image formation, the photosensitive drum 16 rotates at a constant speed in the direction of arrow A2, and the surface of the drum is charged to a constant potential by the charger 18. Next, the original 13 is placed at the exposure position Ex.
The surface of the drum is exposed to light, and the charge on the exposed area is removed to form an electrostatic latent image of the document 13. Unnecessary latent images such as shadows of the document caused by reduction or editing are removed by the erase lamp 19. removed by

Further, as will be described in detail later, when recording additional information, the light irradiated to the exposure position Ex is temporarily blocked, and the additional information is displayed on the surface of the photoreceptor drum 16 by the pixel latent image forming device 21 and the erase lamp 19. A pixel latent image necessary for this is formed.

A developing device 20 attaches toner to the electrostatic latent image formed on the surface of the photosensitive drum 16, and the image is developed as a toner image. The transfer charger 22 is for transferring this toner image onto the incoming copy paper, and the peeling charger 23 is for peeling off the copy paper onto which the toner image has been transferred from the surface of the photoreceptor drum 16. . The cleaner 24 is for removing toner remaining on the drum surface, and the static elimination lamp 25 is for removing residual electric charge on the drum surface.

Next, the structure related to conveyance of copy paper will be explained.

Two paper feed cassettes 27 and 28 are installed in the machine body 2, and a first size of copy paper P1 is set in the paper feed cassette 27.

Also, the paper feed cassette 28 has a second size of copy paper P2.
is set. The first size copy paper P1 is the first
The sheets are taken out one by one by a paper feed roller 31 and sent to a pair of registration rollers 32. Further, the second size copy paper P2 is taken out one by one by a second paper feed roller 33 and sent to a pair of registration rollers 32. Further, the machine body 2 is provided with a manual paper feed port 34, and the copy paper inserted from this paper feed port 34 is transferred to a pair of registration rollers by a third paper feed roller 35 or the like.
It is now sent to 2.

When one of the paper feed rollers 31, 32 or 35 is driven and the copy paper is sent to the registration roller pair 32, the copy paper turns on the registration switch 36 disposed just before the registration roller pair 32, and the primary feeder is turned on. It is now possible to determine when the paper has been completed.

The registration roller pair 32 is connected to the optical system 12 or the image forming mechanism 1.
Copy paper is fed to the photosensitive drum 16 at a constant timing in conjunction with the operation of step 5. This paper feeding is called a so-called secondary paper feeding. As described above, the toner image is transferred to the secondarily fed copy paper by the action of the transfer charger 22. The copy paper on which the toner image has been transferred is peeled off from the drum surface by a peeling charger 23, conveyed by a conveyor belt 37, and applied to a fixing device 38.

A device 38 fixes the toner image on the surface of the copy paper by a method such as heat fixing or pressure fixing.

On the downstream side of the fixing device 38, there are three pairs of first conveying rollers and three pairs of second conveying rollers.
A pair of transport rollers 40 and a pair of discharge rollers 4] are arranged in this order. Further, a first switching guide 42 is arranged between the first transport roller pair 39 and the second transport roller pair 40, and a second switching guide 42 is arranged between the second transport roller pair 40 and the discharge roller pair 41.
A switching guide 43 is arranged.

The first switching guide 42 is for switching whether to guide the copy paper sent from the first transport roller pair 39 to the second transport roller pair 40 or to the internal paper feed path 44 . The copy paper guided to the internal paper feed path 44 by the first switching guide 42 is used for so-called composite copying in which copying is performed over previously copied content.

Further, the second switching guide 43 is for switching whether to guide the copy paper sent from the second transport roller pair 40 to the ejection roller pair 41 or to the paper reversing path 45. The copy paper guided to the paper reversing path 45 is reversed. Thereafter, it is sent to the internal paper feed path 44. In other words,
The second switching guide 43 is for switching between ejecting the copy paper after copying has been completed or transporting the copy paper again in order to copy the back side of the copy paper.

An internal tray 46 is provided downstream of the internal paper feed path 44, and a fourth paper feed roller 47 is provided at the tip of the tray 46. The copy paper sent to the internal tray 46 is
By this fourth paper feed roller 47, the registration roller pair 32
The system is such that the paper is sent to a paper feeder, and is then fed again for secondary paper feeding.

Note that the copy paper sent to the pair of ejection rollers 41 is ejected to the ejection tray 30.

FIG. 1 is a partially enlarged view of the image forming mechanism 15, showing the relationship among the pixel latent image forming device 21, the erase lamp 19, and the shutter 48 that blocks exposure light 49 from the original 13. The pixel latent image forming device 21 includes a pixel display sheet 50 on which a large number of pixels are displayed and a lamp 51. The pixel display sheet 50 is a light-transmissive sheet whose surface faces the surface of the photoreceptor drum 1-6, and the light from the lamp 51 disposed on the back side passes through the sheet 50 to the photoreceptor drum. 16 surfaces are irradiated. At this time, light is blocked in many pixel portions drawn on the pixel display sheet 50, and an electrostatic latent image of the pixels is formed on the surface of the photoreceptor drum 16.

The shutter 48 is used to enable the pixel latent image forming device 21 to function effectively, and primarily blocks exposure light 49 from the original. When the exposure light 49 is blocked, the surface of the photoreceptor drum 16 is not exposed, so the electrostatic charge on that part is not removed, and when that part faces the pixel latent image forming device 21, the pixel latent image forming device 21, an electrostatic latent image of the pixel can be formed. Thereafter, unnecessary pixel latent images are removed by the erase lamp 19.

The arrangement position of the shutter 48 is not limited to the position shown in FIG. 1, but may be any position on the optical path in which the light reflected by the original document 13 is guided to the photosensitive drum 16.

Also, the erase lamp 19 and the pixel latent image forming device 21
The arrangement position of the charger 1 is not limited to the illustrated position.
8 and the developing device 20, for example, the upstream side of the exposure position Ex. Furthermore, the erase lamp 19 may be located upstream of the pixel latent image forming device 21. In such a case, the erase lamp 19 first removes the static charge from the unnecessary portion, and then removes the remaining static 't'T.
A pixel latent image representing additional information is formed in the t-load portion.

FIG. 3 is a plan view of the pixel display sheet 50.

In this embodiment, the pixel display sheet 50 is made of a transparent glass plate, and as shown in FIG. 3, a large number of 7-segment pixels 521, 522, .・・・
・, 52n are described. The 7 segment pixels are
For example, it is painted with black, light-opaque paint.

Pixels 521, 522 of each 7 segments. ..., 52n
As shown in FIG. 4, the pitch between pixels is 1 pitch in both the width direction and the length direction. In this way, by making the pitch between pixels equal vertically and horizontally, and by matching the pitch of one erase lamp (described later) to this pitch, the electrostatic latent image of unnecessary pixels can be removed by the erase lamp 19. .

FIG. 5 is a perspective view of the erase lamp 19, and FIG. 6 is a plan view showing the arrangement relationship between the erase lamp 19 and the photosensitive drum 16.

Referring to FIGS. 5 and 6, the erase lamps 19 are arranged in the lamp unit 55 at a J pitch.
A large number of light emitting diodes 191, 192 .
..., 19n. A large number of light emitting diodes 191, 192 . ...The light emitted by 19n is
The light is arranged so as to irradiate the surface of the photoreceptor drum 16 parallel to its axial direction. In addition, each light emitting diode 1
The heights of 91, 192°, . . . , 19n are also J pitch.

Therefore, a large number of light emitting diodes 191, 192,
..., by selectively lighting up 19n momentarily,
The surface of the photoreceptor drum 16 can be intermittently exposed for each JXJ area, and electrostatic charges on exposed areas can be removed.

Note that since the photosensitive drum 16 rotates at a constant speed, the direction of rotation depends on the light emitting diodes 191 and 192.
．． ..., 19n, the area from which charges are removed can be increased accordingly.

Since the pitch between pixels drawn on the pixel display sheet 50 and the arrangement pitch of the large number of light emitting diodes of the erase lamp are equal as described above, the pixel latent image forming device 21 (see FIG. 1) After forming an electrostatic latent image of 7 segments of pixels shown in FIG. 3 on the surface of the photoreceptor drum 16, as the photoreceptor drum 16 rotates, a
Photosensitive drum 1 in the order of row, ■ row, ■ row, 0 row, and 0 row.
6 When the surface faces the erase lamp 19, each light emitting diode 191, 192, . . . of the erase lamp 19
・, 19n can be sequentially turned on for each row, and if the light-emitting diodes facing the squares with hatching in Fig. 4 are turned on, only the pixel electrostatic latent images of the squares without hatching can be left. can.

If this remaining pixel electrostatic latent image is developed by the developing device 20 (see FIGS. 1 and 2), date information r88-. 3-30J (March 30, 1988
day) and a center mark 60 can be recorded on the copy paper P.

At which position on the copy paper P the additional information such as the date information is to be recorded can be determined by adjusting the closing timing of the shutter 48 and the lighting timing of the lamp 51, as described below.

FIG. 8 is a timing chart when additional information and document information are recorded in the normal copy mode in the copying machine 1.

Next, the operation of the copying machine 1 in the normal copy mode will be explained with reference to FIGS. 1 to 8.

For example, when the copy paper P1 is primarily fed by the paper feed roller 31 and the registration switch 36 is turned on to complete the primary paper feed, the paper feed roller 31 is stopped and the operation of the optical system 12 is started. .

When the lamp 5 illuminates the leading edge of the document 13, the lamp unit 10 turns on the scanning start position detection switch 14.

The registration roller pair 32 is connected to the scan start position detection switch 1
The secondary paper feeding of the copy paper P1 is started after a delay of time t1 from the turning on of the copy paper P1. Turning on the switch 14 and turning on the registration roller pair 32
The reason why there is a lag of time t1 between the paper feeding timing of
This takes into consideration the time it takes for the exposure position Ex of the photoreceptor drum 16 to move to the transfer position (the position facing the transfer charger 22). This is to match the

In response to the scanning start position detection switch 14 being turned on, the shutter 48 is closed for a certain period of time, and after a time t2 delay from the closing of the shutter 48, the lamp 51 is momentarily turned on and an electrostatic latent image of the pixel is formed. .

Furthermore, the erase lamp 19 is selectively turned on a time t3 after the lamp 51 is turned on.

In this way, the timing at which the shutter 48 is closed,
Timing of lighting of lamp 51 and erase lamp 1
As shown in FIG. 1, there is a lag of time t2 and t3 between the lighting timing of 9 and 9, respectively.
This is because the positions of the shutter 48, lamp 51 (pixel latent image forming device 21), and erase lamp 19 are misaligned with respect to the rotational direction of the photosensitive drum 16.

Thereafter, the optical system 12 is reversed by turning off the registration switch 36, and then the pair of registration rollers 32 is stopped.

The reversed optical system is stopped at the stop position.

In the operation shown in FIG. 8, the shutter 48 is closed in response to the turning on of the scan start position detection switch 14, and the lamp 51 and erase lamp 19 are turned on. Therefore, the additional information is as shown in FIG. It is recorded on the leading edge of the copy paper P. Furthermore, the image of the document 13 is deleted from the band-shaped portion where additional information is recorded.

If you want to record the additional information not at the leading edge of the copy paper P but at a desired position fT, the shutter 48 should be closed at a timing from when the scanning start position detection switch 14 is turned on until the optical system 12 is reversed. You can choose any timing in between. Even in that case, there is a lag of time t2 between the timing of closing the shutter 48 and the timing of lighting the lamp 51, and there is a lag of time t2 between the timing of lighting the lamp 51 and the timing of lighting the erase lamp 19. There is no difference in the fact that there is a deviation of t3.

In the above operation, the erase lamp 19 is turned on only to remove electrostatic latent images of unnecessary pixels, but it can also be turned on as necessary to remove unnecessary shadows etc. included in the document information. is preferred.

Furthermore, in the above configuration, the exposure light 49 irradiated onto the photoreceptor drum 16 is temporarily blocked by the shutter 48 to create a band-shaped area on the surface of the photoreceptor drum 16 that is not exposed by the exposure light 49, and pixels are formed in the band-shaped area. Latent image forming device 21
Although the electrostatic latent image of the pixel is formed by using the shutter 48, it is also possible to use the following configuration without using the shutter 48.

That is, as shown in FIG.
Make 3 the black side. In this way, the operation of the optical system 12 is started, and the black surface 53 is illuminated while the lamp unit 10 moves from the stop position to the illumination scan start position. Since almost no light is reflected on the black surface 53, the black surface 53
The photosensitive drum 16 is hardly exposed due to the reflected light. Therefore, an electrostatic latent image of a pixel can be formed by the pixel latent image forming device 21 in this almost unexposed area. In this case, since the black surface 53 is on the upstream side of the illumination scan start position, the registration roller pair 32
It is sufficient to advance the timing of the next paper feed by time t4.

Further, the black surface 53 may be a strip-shaped surface provided along the scanning start position and on the downstream side thereof.

FIG. 10 is a timing chart when the copying machine 1 records additional information and document contents in a superimposed manner by composite copying.

Figures 1 and 2 show the operation when performing composite copying.
The explanation will be made mainly with reference to the figures and FIG. 10.

For example, the primary feeding of the copy paper P1 is carried out by the paper feeding roller 31, the completion of the primary feeding is detected by turning on the registration switch 36, the feeding roller 31 is stopped, and the electrostatic charger 18 is operated for a short time. The surface of the photoreceptor drum 16 is charged in a band-like manner. When the charged surface of the photoreceptor drum 16 faces the pixel latent image forming device 21, the lamp 51 is turned on to form an electrostatic latent image of pixels on the surface of the photoreceptor drum 16. Next, the erase lamp 19 is selectively turned on to remove unnecessary pixels. The developing device 20 then develops the electrostatic core image of the pixel into a toner image. In this case, since the optical system 12 does not need to expose the surface of the photoreceptor drum 16, the optical system 12 does not operate. Note that since the optical system 12 does not operate, there is an advantage that fatigue of the photoreceptor drum 16 can be reduced.

A predetermined time delay after the registration switch 36 is turned on, the registration roller pair 32 starts secondary feeding of the copy paper, and the pixel image formed by the above-described operation is transferred onto the copy paper.

In this case, by changing the operation timing of the charger 18 and the operation timings of the lamp 51 and erase lamp 19 linked thereto, additional information can be recorded at a desired position on the copy paper (see the broken line in the figure). ).

Furthermore, without changing the operation timing of the electrostatic charger 18, etc., two copies of the copy paper fed by the pair of registration rollers 32 can be used.
Even if the next paper feeding timing is changed, the recording position of the additional information can be changed.

After first recording the additional information on the copy paper as described above, the copy paper is guided from the internal paper feed path 44 to the internal tray 46, and the guided paper is again 1
The next sheet is fed and applied to the pair of registration rollers 32. When copy paper is applied to the registration roller pair 32, the registration switch 36 is turned on, and in response to the registration switch 36 being turned on, the fourth paper feed roller 47 is stopped, and the charging charger 18 is stopped.
The operation of the optical system 12 is started, and the operation of the optical system 12 is also started. After the operation of the optical system 12 starts, when the lamp 5 reaches the scan start position, the scan start position detection switch 14 is turned on, and after a certain period of time delay from the turn on of the switch 14, the secondary feeding of copy paper is started by the registration roller pair 32. is started.

When the registration switch 36 is turned off and the trailing edge of the copy paper is detected, the operation of the electrostatic charger 18 is stopped and the optical system 12 is returned.

Then, the operation of the registration roller pair 32 is stopped after a certain time delay.

In this way, the contents of the original document 13 are recorded in a superimposed manner on the copy paper on which date information is recorded.

In the composite copying operation shown in FIG. 10, the additional information is first recorded and then the document contents are recorded, but the document contents may be recorded first and then the additional information is recorded.

Also, for convenience of explanation, it was stated that one erase lamp operates only to remove unnecessary pixel latent images, but when recording the contents of a document, it operates to remove latent images of unnecessary parts such as shadows of the document. Of course, you may do so.

In this embodiment, even when the original 13 is enlarged or reduced in size in the normal copy mode or composite copy mode, the additional information can be recorded in a desired easy-to-read size regardless of the magnification ratio of the original 13.

FIG. 11 is a perspective view of a pixel latent image forming device 61 according to another embodiment of the present invention, and is drawn so that the attachment relationship to the photosensitive drum 16 can be seen.

The pixel latent image forming device 61 according to this embodiment includes a pair of left and right support members 63a and 63b rotatably attached to a drum core shaft 62 protruding from both sides of the photoreceptor drum 16;
A frame plate 64 connected and supported by the support members 63a, 6:3b and disposed facing the surface of the photoreceptor drum 16;
A pixel display sheet 65 fitted into the pixel display sheet 65, a clutch mechanism 66 attached between one support member 63a and the drum core shaft 62, one end of which is attached to one support member 63a, and the other end of which is attached to a fixed part (not shown). A spring 67 is attached to the section. The pixel display sheet 65, like the pixel display sheet 50 described above (see FIG. 3), is made of a light-transmitting member except for the pixel display portion. The spring 67 applies force to the support members 63a, 63b and the frame plate 64 in the direction of arrow A3. The clutch mechanism 66 is for switching between a state where the support member 63a is fixedly connected to the drum core shaft 62 and a state where the support member 63a is freely rotatable with respect to the drum core shaft 62. It is something.

Now, in a state where the support member 63a is connected to the drum core shaft 62 by the clutch mechanism 66, the photoreceptor drum 16
When the support member 63a rotates in the direction of arrow A2, the support member 63a, the frame plate 64 integrated therewith, the image element sheet 65, and the support member 63b also rotate in the same direction against the elastic force of the spring 67. Then, as shown in FIG. 12, when the pixel display sheet 65 comes to the exposure position Ex, the photosensitive drum 16
The surface of the pixel display sheet 65 is exposed to four exposure lights that pass through the pixel display sheet 65. At this time, if the exposure light 49 is made to be light reflected by a white surface, an electrostatic latent image of pixels can be formed on the surface of the photoreceptor drum 16 by the exposure light 49.

The exposure light 49 reflected by the white surface in the above description is, for example, the black surface 53 provided on the lower surface of the tip of the contact glass 3 in FIG.
The timing may be selected so that the pixel display sheet 65 comes to the exposure position Ex when the light 49 reflected by the photoreceptor drum 16 is applied to the photoreceptor drum 16.

After the pixel display sheet 65 passes the exposure position Ex, the clutch mechanism 66 is switched at an appropriate timing and the support member 63a
When the support member 63a, the frame plate 64, the pixel display sheet 65, and the support member 63b integral therewith are made rotatable with respect to the drum core shaft 62, the elastic force of the spring 67 moves the support member 63a as shown in FIG. The position of the group is reversed. Note that when the support member 63a and the like return to their original positions, the four exposure lights are momentarily blocked by the frame plate 64 and the pixel sheet 65, and a shadow is formed on the photoreceptor drum 16; It can be erased using the erase lamp 19.

FIG. 13 is a timing chart when additional information is recorded on the leading edge of copy paper by composite copying using the pixel latent image forming device 61 shown in FIG. 11. Next, a description will be given with reference to FIGS. 2, 9, and 11 to 13.

First, for example, the paper feed roller 31 performs the primary feeding of the copy paper P1, and the completion of the primary feeding is detected by turning on the registration switch 36. Based on this, the optical system 12
start the operation. Further, the clutch 66 is turned on after a certain period of time from the start of the operation of the optical system 12, and the pixel display sheet 65 is rotated together with the photoreceptor drum 16. The reason for delaying the turning on of the clutch 66 in this manner is to wait for the rising speed of the optical system 12 to stabilize. When the image display sheet 65 rotating together with the photosensitive drum 16 reaches the exposure position Ex, the white surface 53' illuminated by the lamp 5
The reflected light (see FIG. 9) is irradiated onto the surface of the photosensitive drum 16. As a result, an electrostatic latent image of pixels is formed on the surface of the photoreceptor drum 16. The clutch 66 is turned off after the image display sheet 65 passes the exposure position Ex. As a result, the pixel display sheet 65 immediately returns to its original position by the force of the spring 67.

Further, the scan start position detection switch 14 is turned on, and when time t5 has passed thereafter, the registration roller pair 32 starts secondary paper feeding. This time t5 is a timing (t5-tl-t4) earlier by time t4, where tl is the time from when the detection switch 14 is turned on during normal copying until the start of secondary paper feeding. ing. The reason why the start timing of the secondary sheet feeding is thus advanced by a time t4 compared to the normal copying is that the above-described latent image forming operation is performed during this time t4.

Although not shown in the timing diagram, the erase lamp 19 is always turned on for images other than the necessary additional information and blood so as to leave only the electrostatic latent image of the necessary additional information.

In this embodiment, even after the image latent image is formed, the optical system 12
The original 13 is exposed to light at this time, and the electrostatic latent image of the original 13 formed by this exposure is generated by the erase lamp 1 as described above.
It is erased by one lighting.

), and then the optical system 12 is returned. However, after the latent image is formed, the optical system 12 may be returned, for example, at the same time as the clutch 66 is turned off. In this way, fatigue on the surface of the photoreceptor drum 16 can be reduced.

In this way, by the timing operation shown in the left half of FIG. 13, additional information associated with the pixel display sheet 65 is first recorded on the leading edge of the copy paper P1.

Then, the copy paper P1 on which the additional information has been recorded is conveyed from the internal paper feed path 44 to the internal tray 46 by switching the first switching guide 2.

The copy paper P1 on which additional information is recorded is stored in the internal tray 46.
After being conveyed to , the paper is again primarily fed to the pair of registration rollers 32 by the fourth paper feed roller 47 .

Then, by turning on the registration switch 36, the optical system 12 is started to be driven again. Then, after a time tl after the scan start position detection switch 14b is turned on, the registration roller pair 3
2 starts the secondary feeding of copy paper P1. and,
When the erase lamp 19 is turned on and the electrostatic charge in unnecessary parts is removed, the image based on the original 13 is transferred to the copy paper P.
1.

Although FIG. 13 shows the operation timing of composite copying in which additional information is recorded first and then original information is recorded, additional information and original information may be recorded forward or backward.

FIG. 14 is another timing chart when additional information is recorded by composite copying using the pixel latent image forming device 61 shown in FIG. 11. FIG. 14 shows the timing when additional information is recorded at an arbitrary position on copy paper by composite copying.

Mainly explaining FIG. 14, in the left half timing operation, after the registration roller pair 32 starts secondary paper feeding, the optical system 12 starts operating at time t6, and the clutch 66 is turned on. In this way, by delaying the drive start timing of the optical system 12 with respect to the secondary feeding of the copy paper, it is possible to record additional information at a desired position, for example, at the trailing edge of the copy paper.

Other operation timings, such as the on/off timing of the clutch 66, which is opened and operated for a certain period of time after the start of the operation of the optical system 12, and the on-timing of the detection switch 14, are the same as the timing operations shown in FIG. The explanation here will be omitted. Also, in the operation shown in FIG. 14, in the left half operation, the optical system 12 is connected to the clutch 6, for example.
It may be returned at the same time as 6 is off. Furthermore,
The left half and right half actions may be performed in the reverse order.

Note that even when this pixel latent image forming device 61 is used, recording of additional information is not affected at all even when copying the original 13 at variable magnification ratios, as in the previous embodiment.

Next, another example of the above-mentioned pixel display sheet 50 or 65 will be explained.

The pixel display sheet 50 of FIG. 15A has a large number of pixels 521, 522, . ..., 52n is an example in which two "dots" are added to the 7-segment pixels.

When the pixel display sheet 50 (65) is configured in this way, the time information rP, 3:30 J (afternoon) as shown in FIG. 3:30) and the center mark 60 of the copy paper P can be recorded.

FIG. 16A shows still another embodiment of the pixel display sheet 50 (65). Pixel display sheet 50 shown in FIG. 16A
(65) to form an electrostatic latent image of the pixel, and
By exposing the hatched squares in the figure with the erase lamp 19, character information rcOPYJ as shown in FIG. 16C can be recorded on the copy paper P.

FIG. 17 shows still another embodiment of the pixel display sheet 50 (65). As shown in the figure, a large number of dots arranged in a matrix may be drawn on the pixel display sheet 50 (65). In this case, an electrostatic latent image of a large number of dots in a matrix is formed on the photoreceptor drum 16, so by selectively exposing unnecessary dots with the erase lamp 19, the hatched dots shown in the figure are created. Any information such as character information "i" can be recorded on the copy paper.

FIG. 18 shows still another embodiment of the pixel display sheet 50 (65). Each pixel written on this pixel display sheet 50 (65) is not arranged in one pixel per nopitch, but is an example in which one pixel spans two nopitch. It's okay.

FIG. 19A shows still another pixel display sheet 50 (65).
Here is an example. As shown in FIG. 19A, the pitch of each pixel may vary from pixel to pixel, such as J1 pitch, sawtooth pitch, or "3 pitch."

In this case, it is also necessary to change the pitch of each light emitting diode constituting one erase lamp in accordance with the pitch of each pixel.

As an advantage of using the pixel display sheet 50 (65) shown in FIG. 19A, as shown in FIG. 19B, so-called horizontally written numerical information r1234J, etc. arranged in the width direction at the leading edge of the copy paper P, etc. Also, as shown in FIG. 19C, numerical information "12" and "12" arranged on the leading edge of the copy paper P in its length direction can be recorded.
34'' etc. can also be recorded in so-called vertical writing.

In this way, the pixel display sheet 50 (
65), it is possible to record additional information in an optimal format depending on the type of paper and whether the original document to be copied is written horizontally or vertically.

<Effects of the Invention> Since the present invention is configured as described above, it is possible to clearly record date information, page number information, and other additional information in addition to original information, and it is possible to clearly record the date information, page number information, and other additional information, as well as the classification of copied sheets.
Storage becomes very convenient.

Additionally, the additional information can be recorded at any position by so-called composite copying, and it is possible to record the additional information at a position that does not interfere with the original information.

Furthermore, even when a document is enlarged or reduced in size, the additional information is clearly recorded in a desired location at a desired easy-to-see size, regardless of the magnification ratio of the document.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main parts of a copying machine employing an embodiment of the present invention. FIG. 2 is a schematic sectional view of a copying machine employing an embodiment of the present invention. FIG. 3 is a plan view showing an example of a pixel display sheet included in the pixel latent image forming device. FIG. 4 is a diagram for explaining the arrangement pitch of pixels on a pixel display sheet. FIG. 5 is a perspective view showing an example of an erase lamp. FIG. 6 is a plan view for explaining the arrangement relationship between the erase lamp and the photosensitive drum. FIG. 7 is a diagram showing an example of additional information recorded by the apparatus according to the embodiment of the present invention. FIG. 8 is a timing chart showing the operation of a copying machine in which an embodiment of the present invention is adopted, when additional information is recorded in a normal copy mode to be superimposed on document information. FIG. 9 is a sectional view showing an example of the structure around the tip of the contact glass. FIG. 10 is a timing chart showing the operation of a copying machine employing an embodiment of the present invention when additional information and document information are superimposed and recorded by composite copying. FIG. 11 is a perspective view showing the configuration of a pixel latent image forming apparatus according to another embodiment of the present invention. FIG. 12 is a sectional view for explaining the operation of a pixel latent image forming device according to another embodiment of the present invention. FIGS. 13 and 14 are timing charts illustrating the operation of a copying machine in which the pixel latent image forming apparatus shown in FIG. 11 is used to perform composite copying. FIG. 15A shows another example of the pixel display sheet,
Figure B shows an example of lighting control of the erase lamp for the pixel display sheet, and Figure 15C shows additional information recorded in that case. FIG. 16A is still another example of a pixel display sheet,
FIG. 16B shows an example of lighting control of the erase lamp on the pixel display sheet, and FIG. 16C shows an example of additional information recorded at that time. FIG. 17 is a diagram showing still another example of the pixel display sheet. FIG. 18 is a diagram showing still another example of the pixel display sheet. FIG. 19A is a diagram showing still another example of a pixel display sheet, and FIG. 19'B and FIG. 19C are diagrams showing, respectively,
It is a figure which shows the example of additional information recorded by the pixel display sheet. In the figure, 1... copying machine, 3... contact glass, 12... optical system, 14... scanning start position detection switch, 15... image forming mechanism, 16... photosensitive drum, 1... Erase lamp, 21.61... Pixel latent image forming device, 48... Shutter, 49... Exposure light, 50°65... Pixel display sheet, 51... Lamp, 53... indicates a black surface, 53'... indicates a white surface. Figure 16C Figure 17 Figure 9B Figure 9C

Claims (1)

[Claims of Claims] 1. Copying in which a photoreceptor charged to a constant potential is exposed to light to form an electrostatic latent image of the original, the latent image is developed into a toner image, and the toner image is transferred to paper. An additional information recording device for an apparatus, comprising: a pixel latent image forming means provided near the surface of the photoreceptor and capable of forming an electrostatic latent image of a large number of pixels on the surface of the photoreceptor; and the photoreceptor. arranged opposite to the surface of the photoconductor so that when an electrostatic latent image is formed on the photoconductor surface by the pixel latent image forming means, only an electrostatic latent image of a given pixel is formed. An additional information recording device comprising: an erase means for removing static charge from unnecessary portions. 2. In the additional information recording device according to claim 1, the pixel latent image forming means is provided with its surface facing the surface of the photoreceptor, and the portion other than the pixel display portion is made of a light-transmitting member. a pixel display sheet; an illumination means provided on the back side of the sheet and capable of exposing the surface of the photoreceptor through the sheet; and a shielding means for shielding light for the purpose of the present invention. 3. In the additional information recording device according to claim 1, the pixel latent image forming means is provided with its surface facing the surface of the photoreceptor, and the portion other than the pixel display portion is made of a light-transmitting member. The present invention is characterized in that it includes: a pixel display sheet; and a sheet moving means for moving the sheet in accordance with the movement of the surface of the photoreceptor.