JPH05333641A - Copying device - Google Patents

Abstract

PURPOSE:To shorten an illuminating/scanning width at the time of selecting the form of a size larger than an original size by making the illuminating/scanning width same as the original size, and destaticizing the left part of the form of the size longer than that of an original, when the specified form size is longer than the original size in an illuminating/scanning direction. CONSTITUTION:When the original size is discriminated by a size detecting sensor 15, according to the opening/closing of the pressing plate of an original feeder 13, a CPU judges whether coping is started or not. When a copy starting key is depressed, and a set detecting sensor 14 is turned on, it is judged whether an automatic form selecting mode is obtained, or not. When the automatic form selecting mode is turned off, the original size is confirmed, and then, it is judged that the size of the specified form is larger than the discriminated original size. When the size of the form is large, a copying action can be selected. The copying action is one for the illuminating/ scanning of the width coincident with the original size and destaticization for the left part of the form of the size longer than that of the original, with, for instance, the eraser of an LED, etc., and only the illuminating/scanning of the width coincident with the original size, is executed, so that a wasted exposure is eliminated, power can be saved and a coping time is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a size discriminating function for discriminating the size of a document placed on a document table by opening and closing a pressure plate, and an automatic selecting paper of the document size discriminated by the size discriminating function. The present invention relates to a copying apparatus having a paper selection function and illuminating and scanning an original placed on an original table to form an image.

[0002]

2. Description of the Related Art In the above copying apparatus, a size for discriminating the size of a document placed on a document table when a pressure plate or a document feeding device is opened / closed by detection signals of a plurality of photosensors provided in an optical system. It has a discrimination function. further,
Some of the copying machines have a size discrimination function for discriminating the size of a document by the combination of the detection position of the photo sensor and the timing when the document is fed to the platen by the document feeder.

A copying machine having such a size discrimination function is also provided with an automatic paper selection function for automatically selecting a paper, and a paper of the same size as the size detected by the size discrimination function is selected. By feeding
Prevents miscopying due to size error. But,
The automatic paper selection function can be canceled by the user in order to obtain a copy of a size different from the original. Therefore, for example, when it is desired to copy an A4 size image onto half of an A3 size paper, the A4 size landscape original is set at a predetermined position and the A3 size paper is selected.

[0004]

When a paper larger than the original size in the illumination scanning direction is selected such that an A4 size image is copied to half of the above A3 size sheet, the illumination scanning width, that is, the scanning width is selected. Perform according to the width of the paper. This is because a black solid image is formed on half of the sheet without the original unless the portion without the original is exposed. However, the power consumption of exposing a document occupies a large proportion of the power consumption of the entire copying apparatus, resulting in wasted power consumption. Moreover, there is a problem that the copy time becomes longer as the scan width becomes longer.

The present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide a copying apparatus that can shorten the illumination scanning width even when a paper larger than the original size is selected in the illumination scanning direction.

[0006]

In order to achieve the above object, the present invention provides a size discriminating function for discriminating the size of a document placed on a platen by opening and closing a pressure plate, and the size discriminating function. A copying machine which has an automatic paper selection function for selecting a paper of a different original size and which forms an image by illuminating and scanning the original placed on the original table when the automatic paper selection function is in the off state. When the specified paper size is longer in the illumination scanning direction than the original size determined by the size determination function, the illumination scanning width is adjusted to the original size and the portion longer than the original of the paper size is neutralized. There is.

Further, according to the present invention, it is possible to selectively switch between a mode in which the illumination scanning width is adjusted to the original size and a portion of the paper size which is longer than the original is eliminated, and a mode in which the illumination scanning width is adjusted to the specified paper size. It is characterized by

Further, according to the present invention, a size determining function for determining a document size by sending a document to a document table by a document feeding device and a size of a document placed on the document table by opening and closing the document feeding device. In a copying apparatus that has a size determining function for performing an illumination scan on a document placed on a document table to form an image, a specified paper size is determined based on the document size determined by feeding the document by the document feeder. When the illumination scanning width is long, the illumination scanning width is adjusted to the original size, and when the specified paper size is longer than the original size determined by the opening / closing operation of the document feeder, the illumination scanning width is adjusted to the specified paper size. It is characterized by matching.

[0009]

According to the above construction, when the designated paper size is longer than the original size in the illumination scanning direction, the illumination scanning width is adjusted to the original size and the portion longer than the original of the paper size is neutralized. Consumption, and the copying time is shortened.

Further, even if the specified paper size is longer than the original size in the illumination scanning direction, a copy of a normal size original and a small original can be obtained.

Further, when the specified paper size is longer in the illumination scanning direction than the original size determined by feeding the original by the original feeding device, the illumination scanning width is adjusted to the original size and the determination is made by the opening / closing operation of the original feeding device. When the designated paper size is longer than the designated original size in the illumination scanning direction, the illumination scanning width is adjusted to the designated paper size, so that there is no miscopying, wasteful power consumption is eliminated, and the copying time is shortened.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a layout view of a photo sensor for detecting a document size of a copying apparatus according to the present invention. In FIG.
The copying apparatus of this embodiment can copy up to A3 size, and the photo sensor 10 as a size detecting means for detecting the document size is arranged so as to detect from A6 size to A3 size. Then, the document is set on a contact glass as a document table, and each photo sensor 10 detects the document until the platen (not shown) is closed or before the copy start key is pressed, and the CPU A detection signal is input to (not shown). CP
U determines the document size based on the combination of signals from the photosensors 10.

The above-mentioned document size discriminating function itself is already known, and after the document size is discriminated, a sheet of the same size as the document size is selected by the automatic sheet selection function. The automatic paper selection function detects the size of paper stored in a paper feed cassette or the like in advance, and issues a paper feed command to a cassette that contains paper of the same size as the determined original size.

Here, when the automatic paper selection function is canceled by designating the paper size, conventionally, illumination scanning is performed according to the paper size. Therefore, when a paper larger than the original size is selected in the illumination scanning direction, there is a problem in that the large amount of paper causes unnecessary exposure.

The present invention takes steps to solve such a problem.

FIG. 2 is a flow chart showing an embodiment of the present invention. When the original size is determined by opening / closing the pressure plate, it is determined whether copying is started. When copying is started, it is determined whether the mode is the automatic paper selection mode. When the automatic paper selection mode is turned off, after the original size is confirmed, the specified paper size is judged to be larger than the judged original size. If the paper size is large, the copying operation 2 is performed. To be selected. The copying operation 2 is a copying operation in which illumination scanning with a width according to the original size is performed, and a portion longer than the original with a paper size is neutralized by an eraser such as an LED. Only the illumination scanning with a width according to the original size is performed. Since it is not performed, useless exposure is eliminated, power can be saved, and copy time can be shortened.

Further, the size of the designated paper is judged to be larger than the size of the judged original, and if the size of the paper is smaller, the copying operation 3 is selected. This copying operation 3 is
This is a copying operation of performing illumination scanning with a width according to the paper size and static elimination. Furthermore, when the automatic paper selection mode is turned on, the copy operation 1 is selected. This copy operation 1
Is a normal copying operation, in which illumination scanning is performed with a width that matches the paper size and the document size.

FIG. 3 is a timing chart comparing the copying operation 3 and the copying operation 2, in the case where the document size is A4 landscape and A3 size paper is selected. Figure 3
In the copying operation 3 of (a), the scanner is used for the A3 size T
Although it is turned on for 1 hour, in the copying operation 2 of FIG. 3B, the scanner is turned on for A2 size for T2 hours, and the scanning time is shortened by time T3.

FIG. 4 is a layout view of an operation section showing another embodiment of the present invention. The operation section 11 is provided with a paper size scan key 12. The paper size scan key 12 can select the copying operation 3 for illuminating and scanning the width corresponding to the paper size by the key operation even if the size of the paper is judged to be larger than the original size.

In the above embodiment, for example, when an A4 original and a small original are placed on the contact glass and copied with A3 paper, the small original is not detected by the photosensor 10 and the A4 original is copied. It is determined that the copy will be made on A3 paper. At this time, since the illumination scanning having the width corresponding to the determined original size is performed, there is a problem that a small original is not copied.

Therefore, in this example, to explain with reference to the flowchart of FIG. 5, it is judged whether the paper size scan key 12 is turned on after the specified paper size is judged to be larger than the judged original size. Then, by turning on the paper size scan key 12, it is possible to obtain a copy of the A4 original and the small original.

FIG. 6 is a perspective view showing still another embodiment of the present invention. In this embodiment, the original feeding device 1 is used instead of the pressure plate.
3 is used. The document feeding device 13 includes a set detection sensor 14 that detects a document set known per se,
A size detection sensor 15 that detects the size of the document is provided. When the copy start key is pressed and the set detection sensor 14 is turned on, it is determined that there is a document, and the document feeding device 13 feeds the document to the contact glass. The size of the document is determined by the size detection sensor 15 provided in the document and the size of the document and the time during which the size detection sensor 15 is turned on during feeding.

Also in this example, as shown in the flow chart of FIG. 7, when the specified paper size is longer in the illumination scanning direction than the original size determined by the original feeding device 13 feeding the original, the scan width is set to the original size. To match. Therefore, as in the embodiment shown in FIG. 2, since the copying operation 2 is selected, useless exposure is eliminated, and it is possible to save power and shorten the copy time.

When the designated paper size is longer in the illumination scanning direction than the document size determined by the opening / closing operation of the document feeding device 13, the illumination scanning width is adjusted to the designated paper size, so that the original document and the small document are scanned. You get a copy of and. It should be noted that if a document is fed by the document feeding device 13, a copy of a normal size document and a small-sized document cannot be obtained, but since the document feeding device 13 cannot send a normal-size document and a small-sized document side by side, The image of the original document is not cut.

[0025]

According to the first aspect of the present invention, when the designated paper size is longer than the original size in the illumination scanning direction, the illumination scanning width is adjusted to the original size, and a portion longer than the original of the paper size is discharged. Therefore, wasteful power consumption is eliminated and the copying time is shortened.

According to the second aspect of the present invention, even if the size of the paper is larger than the size of the original, it is possible to make a copy by combining the original of that size and the original of a small piece.

According to the third aspect of the invention, when the designated paper size is longer in the illumination scanning direction than the document size determined by feeding the document by the document feeder, the illumination scanning width is adjusted to the document size and the document feeding is performed. When the specified paper size is longer than the original size determined by the opening / closing operation of the device in the illumination scanning direction, the illumination scanning width is adjusted to the specified paper size, so there is no miscopying, wasteful power consumption is eliminated, and copying is possible. Time will also be shortened.

[Brief description of drawings]

FIG. 1 is a layout view of a photo sensor for detecting a document size of a copying apparatus according to the present invention.

FIG. 2 is a flowchart showing an embodiment of the present invention.

FIG. 3 is a timing chart comparing a copy operation 3 and a copy operation 2.

FIG. 4 is a layout view of an operation unit showing another embodiment of the present invention.

FIG. 5 is a flowchart showing another embodiment of the present invention.

FIG. 6 is a perspective view of a document feeding device 13 showing still another embodiment of the present invention.

FIG. 7 is a flow chart showing another embodiment of the present invention.

[Explanation of symbols]

 10 Photo Sensor 11 Operation Unit 12 Paper Size Scan Key 13 Document Feeder 14 Set Detection Sensor 15 Size Detection Sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 1/04 101 7251-5C

Claims (3)

[Claims] 1. A size discriminating function for discriminating the size of a document placed on a document table by opening and closing a pressure plate, and an automatic sheet selection function for selecting a sheet of the document size discriminated by the size discriminating function. Then, in a copying apparatus that forms an image by illuminating and scanning an original placed on an original table, when the automatic paper selection function is in the OFF state, the original size determined by the original size determined by the size determination function is specified. A copying apparatus characterized in that when the paper size is long in the illumination scanning direction, the illumination scanning width is adjusted to the original size and a portion longer than the original of the paper size is discharged. 2. The copying apparatus according to claim 1, wherein the illumination scanning width is adjusted to the original size and a portion of the paper size longer than the original is neutralized, and the illumination scanning width is adjusted to the specified paper size. A copying apparatus characterized in that and can be selectively switched. 3. A size discriminating function for discriminating a document size by sending the document to a document table by a document feeder.
A copying apparatus that has a size determination function that determines the size of a document placed on the document table by opening and closing the document feeder, and forms an image by scanning the document placed on the document table with illumination. If the specified paper size is longer in the illumination scanning direction than the original size determined by feeding the original by the feeder, the illumination scanning width is adjusted to the original size and specified from the original size determined by the opening / closing operation of the original feeder. A copying machine characterized in that when the paper size is long in the illumination scanning direction, the illumination scanning width is adjusted to the specified paper size.