JPS5915948A - Picture forming machine - Google Patents

Abstract

PURPOSE:To execute easily trimming, namely, to erase an unnecessary picture, and to reduce the burden to a cleaning device, by selecting a desired area of an original by a switch provided on an original placing plate of a picture forming machine. CONSTITUTION:A photosensitive drum 6 provided with photoconductivity is rotated clockwise, is charged uniformly by a charger 7, and there after, an original 1 on an original placing plate 11 is exposed and scanned in the Y axis direction by an original sheet illuminating device 9, and is irradiated onto the drum through a reflection mirror 9'. In the downstream from a latent image forming area 6', a non-picture forming exposure lamp train 5 is provided in the longitudinal direction. In case when it is desired to copy only an oblique line part and to erase other part, switches of the X axis and the Y axis corresponding to the oblique line area are turned on. For instance, in the X axis switches X4-Xa-1 are turned on and other switches are turned off, and in the Y axis, Y5-Yb-1 are turned on and other switches are turned off. In this way, an unnecessary picture can be erased, and copying of only a desired area can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming machine, and more particularly to an image forming machine equipped with a so-called trimming function that forms an image only on an arbitrary part of a document.

For example, even in an electrophotographic copying machine, the entire area of a document is not necessarily required. With conventional copiers,
In such a case, use a sheet with a smaller size X of the transfer paper,
Alternatively, copies had to be made smaller by cutting out unnecessary parts of the manuscript by hiding them with blank paper.

Additionally, if the size of the transfer paper is smaller than the original, an inconvenience will occur because images will be formed on the tilted plate that is not copied, and similarly, even in devices that can change the copying magnification, images will be formed on unnecessary parts on the photoreceptor. There were some inconveniences. Disadvantages include unnecessary removal of developer and increased burden on the cleaning device.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques and to provide an image forming machine that allows a user to select an area or document position in which an image is desired to be formed when a document is set.

a setting means for setting a non-image forming area, an instructing means for instructing a non-image forming area based on the setting, and an instruction means provided opposite to the latent image carrier, for forming an image on the non-image forming area of the latent image carrying body according to the above instructions. and erasing means for erasing the latent image.

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

FIG. 1 is a plan view of a document table of an electrophotographic copying machine.

As a result, the part (hatched area) of the original 1 that you wish to copy 2
The case of copying only the file will be explained. Around the document table 11, there are arranged switch rows 3.4 that are subdivided into a matrix corresponding to the X and Y axes (vertical and horizontal directions). If you set a document and want to copy only the shaded area and erase the other parts, turn on (input) the X- and Y-axis switches corresponding to the shaded area.

For example, a switch on the X axis! , ~) m, of f f
%X a ~x, -1 is OnX, L%X6 is off
Make it f. Furthermore, on the Y axis, 74"3'@off-~
The user sets yb-1 to On - and 7bN to Off.

FIG. 2 is an explanatory diagram of the copying process of the electrophotographic copying machine according to the present invention. A photosensitive drum 6 having a photoconductive layer on a conductive substrate rotates clockwise in the figure. After the surface of the photosensitive drum 6 is uniformly charged by the charger 7, the original 1 on the original platen 11 is exposed and scanned in the Y-axis direction by the original illumination device 9, and the reflection S79' is exposed on the photosensitive drum 6. It is then irradiated. As a result, an electrostatic latent image is formed on the photosensitive drum.

A non-image forming exposure lamp array 5 is provided downstream of the latent image forming area 6' in the longitudinal direction of the photosensitive drum 6. FIG. 3 is a plan view of the non-imaging exposure row 5. For example, light emitting elements such as LEDs and ELs are subdivided according to the number n of switches provided across the above-mentioned X axis.

That is, non-image forming exposure lamp arrays 11 to 11 are provided corresponding to X-axis to Xn on the X-axis. If the photosensitive drum 6 on which the latent image has been formed is exposed with the non-image forming exposure rung row 5, the charge on the drum can be erased, so that the latent image in this area can be erased.

For example, if the document illumination device @9 moves in the direction of the arrow in FIG.
When in position m, turn on lamp row 5, y, ~7b-
Off with z.

If yb-yffi is turned on, the area other than the shaded area 2 will be erased. This electrophotographic copying machine is equipped with a copying circuit 16 for copying only the shaded portions of the original. Therefore, in the case of the original shown in FIG. 1, the scanning direction is 7z7. → If yb-+7m, then x
IS′xn and 1f) OR→X4ゞXB and 7 @ ”'
l) OR → x > ~ OR of xn and yb → Xz ~ xn
By ORing Tm and Tm, it is possible to blink 1, . This situation is shown in FIG. It is assumed that y, to yn move due to changes in time or position.

Incidentally, the lamp row 5 is an LED with a fast blinking response speed.

EL or the like is preferable, and from the viewpoint of further segmentation, a liquid crystal may be used to turn the transmitted light on and off. Also, y1~yn
It is preferable to obtain a signal for the change by detecting the time from the starting time of the lighting device or by detecting the position.

The surface of the drum that has passed through the non-image forming exposure lamp array 5 is developed in a developing section (not shown) and transferred onto a copying paper, making it possible to obtain a copy of only the desired area.

Next, a case will be described in which the paper sizes of the original and copy paper are considered. For example, non-image portion formation can be performed by determining the paper size of the copy paper using a signal from a copy paper cassette, another transfer paper size detection signal, or a selective paper size selection switch. That is, when the original is A5 and the transfer paper is A4, the signal or the A4 selection switch automatically erases images outside A4y size. This situation is shown in FIG.

That is, the original size is (x1 to x21) x (y, ~yI!
I) corresponds to D, and the copy paper size at this time is (X l ~
In the case of X&1)X(yl~yb・), input the X-axis switch Then, as the exposure illumination device 9 scans, the non-image forming exposure lamps la+1- and the like (shaded areas) light up the latent image area of the photosensitive drum corresponding to outside the common area. As a result, only the area corresponding to the size of the paper to be copied can be copied. Therefore, even if a document larger than A4 is copied, only the A4 size area (11 to xlLl) x (y1 to yb/) will be imaged. Similarly, when changing the copy magnification, for example, A
If the size is 5→A4, it is also possible to erase images in areas other than A4.

In this embodiment, the case where the original is placed face down on the original table is shown, but in this case, a method for checking the desired copy area of the original is to provide a rank under the original table and set it before starting the copying process. All you have to do is turn on this lamp and set the above area.

FIG. 7 shows another embodiment of the invention. On the document table 11 of the copying machine 12, there is an automatic feeder 15 (hereinafter referred to as ADF's Automat) whose one end that can be opened and closed is pivotally supported.

A double feeder is provided. The ADF 15 automatically supplies the documents 1 stacked on the tray 14 to the document table one by one. This supply is
The belt 15' and rollers are normally white, so even if the original is smaller than the paper size of the paper in the cassette 15, the outside of the original will be white. be done. However, in reality, during long-term use, the bell 13' becomes gradually soiled, and this soiling is often replicated, resulting in extremely inconvenient conditions.

In this embodiment, such belt stains are not copied. As long as the original size area is set using the switch rows 5.4 on the X and Y axes provided around the original platen 110, it is possible to obtain a clean copy with plain white color except for the original area.

Furthermore, in the present invention, since it is possible to erase unnecessary images that are not transferred even if the copying paper is too small, it is possible to reduce the burden on the cleaning device without wasting developer consumption. Furthermore, even if an unnecessary portion of the image occurs depending on the copying magnification, it can be automatically erased, so the same can be said of the above.

As described above, according to the present invention, it has become possible to easily trim, that is, erase unnecessary images, by selecting a desired area of the document using a switch provided on the document table of the image forming machine.

[Brief explanation of drawings]

1 is a plan view of the document table of an electrophotographic copying machine, FIG. 2 is a diagram for explaining the copying process, FIG. 6 is a plan view of the non-image forming exposure lamp array, and FIG. 4 is a plan view of the document illumination device 9. Figures 5 and 6 are diagrams showing the relationship between movement and the Y-axis 2-pump array, Figures 5 and 6 are explanatory diagrams of the operation of the switchboard for erasing outside the desired area of the document, and the 2-pump array for non-image forming exposure. FIG. 7 is an external perspective view of a copying machine equipped with an automatic document feeder according to another embodiment of the invention. 1・@9・Contest manuscript, 3, 4... Switch row (setting means) 5... Non-image forming exposure lamp row (erasing means) 6... Photosensitive drum (latent image bearing body) 7...
Charger, 9...0 Haraaki lighting device 16...OFI
Logic circuit (instruction means) pot・, -9

Claims (1)

[Scope of Claims] In an image forming apparatus that forms a latent image of a document on a latent image carrier and then develops the image, there is provided a setting means for setting a non-image forming area of the document, and a setting means for specifying the non-image forming area based on the setting. and an erasing means that is provided opposite to the latent image carrier and erases the latent image formed in the non-image area of the latent image carrier according to the above instructions. image forming machine.