JP3154551B2 - Copier - Google Patents

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 / closing operation of a pressure plate, and an automatic sheet selecting apparatus for selecting a sheet of the document size discriminated by the size discriminating function. The present invention relates to a copying apparatus that has a paper selection function and forms an image by illuminating and scanning a document placed on a document table.

[0002]

2. Description of the Related Art In the above-described copying apparatus, a size for determining the size of a document placed on a document table when a pressure plate or a document feeder is opened or closed, based on detection signals of a plurality of photosensors provided in an optical system. It has a discrimination function. further,
Some copiers have a size discriminating function for discriminating the size of a document based on a combination of a detection position of a photosensor and timing when a document is fed to a document table by a document feeder.

A copying apparatus having such a size discriminating function is provided with an automatic sheet selecting function for automatically selecting a sheet, and selects a sheet of the same size as the size detected by the size discriminating function. By feeding paper
Miscopying due to size error is prevented. But,
The automatic paper selection function can be canceled by the user in order to obtain a copy of a size different from that of the original. Therefore, for example, when it is desired to copy an A4 size image on half of an A3 size sheet, the A4 size landscape document is set at a predetermined position, and the A3 size sheet is selected.

[0004]

When a sheet larger than the document size in the illumination scanning direction is selected such that an A4 size image is copied on half of the A3 size sheet, the illumination scanning width, that is, the scanning width is selected. Perform according to the specified paper width. This is because a black solid image is formed on half of the paper without the document unless the portion without the document is exposed. However, the power consumption for exposing a document occupies a large proportion of the power consumption in the entire copying apparatus, and wasteful power is consumed. In addition, 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,
It is an object of the present invention to provide a copying apparatus capable of reducing an illumination scanning width even when a sheet larger than a document size is selected in an 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 document table by opening and closing operations of a pressure plate, and a discriminating function based on the size discriminating function. An automatic paper selection function for selecting paper of the same size as the original, and illuminating and scanning the original placed on the platen to form an image. When the paper size specified in the illumination scanning direction is longer than the document size determined by the size determination function, a mode in which the illumination scanning width is adjusted to the document size and a portion longer than the paper size document is discharged. It is characterized in that a mode for adjusting the scanning width to a designated paper size can be selectively switched.

[0007]

Further, the present invention provides a size discriminating function for discriminating a document size by feeding a document to a document plate by a document feeder, and discriminating a size of a document placed on the document plate by opening and closing operation of the document feeder. In a copying apparatus that forms an image by illuminating and scanning a document placed on a document table, a specified sheet size is determined based on the document size determined by feeding the document by the document feeder. When the length is long in the illumination scanning direction, the illumination scanning width is adjusted to the document size.When the paper size specified by the document size determined by the opening and closing operation of the document feeder is long in the illumination scanning direction, the illumination scanning width is set to the specified paper size. It is characterized by matching.

[0009]

According to the above arrangement, when the specified paper size is longer than the original size in the illumination scanning direction, the illumination scan width is adjusted to the original size, and the portion longer than the original of the paper size is neutralized. In addition, even if the copy time is shortened and the specified paper size is longer than the original size in the illumination scanning direction, a copy in which a normal size original and a small original are combined can be obtained.

[0010]

Further, when the designated paper size is longer in the illumination scanning direction than the original size determined by feeding the original by the original feeder, the illumination scanning width is adjusted to the original size and determined by the opening / closing operation of the original feeder. When the specified paper size is longer than the specified document size in the illumination scanning direction, the illumination scanning width is adjusted to the specified paper size, so that there is no erroneous copying, unnecessary 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 diagram of a photo sensor for detecting a document size in the copying apparatus according to the present invention. In FIG.
The copying apparatus according to the present embodiment can copy up to A3 size, and the photo sensor 10 as a size detecting unit for detecting the document size is arranged so as to be able to detect from A6 size to A3 size. Then, the original is set on a contact glass serving as an original table, and each photo sensor 10 detects the original until a pressure plate (not shown) closes or until the copy start key is pressed after the closing. (Not shown). CP
U determines the document size based on a combination of signals from the photosensors 10.

The above document size discriminating function itself is already known. After discriminating the document size, a sheet of the same size as the document size is selected by the automatic paper selecting function. This automatic paper selection function detects the size of paper stored in a paper cassette or the like in advance, and issues a paper feed command to a cassette storing paper of the same size as the determined document size.

Here, when the automatic paper selection function is released by designating the paper size, conventionally, illumination scanning according to the paper size is performed. Therefore, as described above, when a sheet larger than the document size is selected in the illumination scanning direction, there is a problem in that useless exposure is performed for the larger sheet.

The present invention takes measures to solve such a problem.

FIG. 2 is a flowchart showing an embodiment of the present invention. When the size of the original is determined by opening and closing the pressure plate, it is determined whether or not the copy is started. When the copy is started, it is determined whether or not the automatic paper selection mode is set. If the automatic paper selection mode is turned off, after the document size is confirmed, the specified paper size is determined to be larger than the determined document size. If the paper size is larger, the copy operation 2 is performed. Selected. The copying operation 2 is a copying operation in which an illumination scan having a width corresponding to the document size is performed, and a portion longer than the paper size document is a charge removal operation using an eraser such as an LED, for example. Since it is not performed, useless exposure is eliminated, power can be saved, and copy time can be reduced.

The size of the designated paper is determined to be larger than the determined original size. If the size of the paper is smaller, the copying operation 3 is selected. This copying operation 3
This is a copying operation in which illumination scanning with a width corresponding to the paper size and static elimination are performed. Furthermore, when the automatic paper selection mode is turned on, the copy operation 1 is selected. This copying operation 1
Is a normal copying operation, and performs illumination scanning with a width corresponding to the paper size and the document size.

FIG. 3 is a timing chart comparing the copy operation 3 and the copy operation 2 in a case where the document size is A4 landscape and A3 size paper is selected. FIG.
In the copy operation 3 of (a), the scanner operates the A3 size T
The scanner is turned on for one hour, but in the copying operation 2 of FIG. 3B, the scanner is turned on for T2 time corresponding to A4 size, and the scanning time is reduced by time T3.

FIG. 4 is a layout view of an operation unit according to another embodiment of the present invention. The operation unit 11 is provided with a paper size scan key 12. The paper size scan key 12 allows the user to select an illumination scan having a width corresponding to the paper size and a copying operation 3 for removing static electricity, even if the size of the paper is determined from the size of the original.

In the above embodiment, for example, when an A4 original and a small original are placed on the contact glass and copied on A3 paper, the small original is not detected by the photo sensor 10 and the A4 original is detected. It is determined to copy on A3 paper. At this time, the illumination scan having a width corresponding to the determined document size is performed, so that a small document is not copied.

In the present embodiment, referring to the flowchart of FIG. 5, after the size of the designated paper is determined to be larger than the determined original size, it is determined whether the paper size scan key 12 is turned on. Thus, by turning on the paper size scan key 12, a copy in which the A4 document and the small document are combined can be obtained.

FIG. 6 is a perspective view showing still another embodiment of the present invention. In this embodiment, a document feeder 1 is used instead of a pressure plate.
3 is used. The document feeder 13 includes a set detection sensor 14 for detecting a document set known per se,
A size detection sensor 15 for detecting a document size. 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 is sent from the document feeder 13 to the contact glass. The size of the original is determined based on the width of the original and the length of time the size detection sensor 15 is turned on while the document is being fed.

Also in this embodiment, as shown in the flowchart of FIG. 7, when the specified paper size is longer in the illumination scanning direction than the document size determined by feeding the document by the document feeder 13, the scan width is set to the document size. Adjust to Therefore, as in the embodiment shown in FIG. 2, since the copy operation 2 is selected, useless exposure is eliminated, and the effect of saving power and shortening the copy time is obtained.

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 feeder 13, the illumination scanning width is adjusted to the designated paper size, so that the original document and the small original document are adjusted. Is obtained. When the original is fed by the original feeder 13, a copy of the normal size original and the small original cannot be obtained. However, since the normal original and the small original cannot be sent side by side by the original feeder 13, the small original is not sent. Is not cut.

[0025]

According to the first aspect of the present invention, when the specified paper size is longer than the original size in the illumination scanning direction, the illumination scan width is adjusted to the original size and the charge is removed by an amount longer than the paper size original. Therefore, wasteful power consumption is eliminated, the copying time is shortened, and even if the size of the sheet is larger than the size of the original, copying in which the original of that size and a small original are combined can be performed.

[0026]

According to the second aspect of the present invention, when the specified 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. When the specified paper size is longer than the document size determined by the opening and closing operation of the apparatus in the illumination scanning direction, the illumination scanning width is adjusted to the specified paper size, so that there is no erroneous copying, no waste of power is consumed, and copying is performed. Time is also shorter.

[Brief description of the drawings]

FIG. 1 is a layout diagram of a photo sensor for detecting a document size in 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 according to 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 feeder 13 showing still another embodiment of the present invention.

FIG. 7 is a flowchart showing still another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 photo sensor 11 operation unit 12 paper size scan key 13 document feeder 14 set detection sensor 15 size detection sensor

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification code FI H04N 1/04 101 G03G 21/00 340 (56) References JP-A-1-233466 (JP, A) JP-A-4-270335 (JP, A) JP-A-1-102479 (JP, A) JP-A-59-22043 (JP, A) JP-A-61-282854 (JP, A) JP-A-60-31166 (JP, A) JP-A-58-184955 (JP, A) JP-A-61-132941 (JP, A) Patent 2666957 (JP, B2) Patent 2620291 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) G03G 21/00 370-512 G03B 27/62 G03G 15/00 107 G03G 15/04-15/04 120 G03G 21/06 H04N 1/04 101

Claims (2)

(57) [Claims] 1. A size discriminating function for discriminating the size of a document placed on a document table by opening and closing operation of a pressure plate, and an automatic sheet selecting function for selecting a sheet of the document size discriminated by the size discriminating function. In a copying apparatus that forms an image by illuminating and scanning a document placed on a document table, when the automatic paper selection function is in an OFF state, the document is designated based on the document size determined by the size determination function. When the paper size is long in the illumination scanning direction, a mode in which the illumination scanning width is adjusted to the document size and a portion longer than the paper size original is removed, and a mode in which the illumination scanning width is adjusted to the specified paper size are selectively performed. A copying apparatus characterized by being switchable. 2. A size discriminating function for discriminating a document size by sending a document to a platen by a document feeder;
A copying apparatus that has a size determining function of determining the size of a document placed on a document table by opening and closing operation of a document feeder, and forms an image by illuminating and scanning a document placed on the document table; When the paper size specified by the document size determined by sending the document by the feeding device is longer in the illumination scanning direction, the illumination scanning width is adjusted to the document size, and the document size specified by the document size determined by the opening / closing operation of the document feeding device. When the paper size is long in the illumination scanning direction, the illumination scanning width is adjusted to the designated paper size.