JPS60169845A - Original size detector of copying machine - Google Patents

Abstract

PURPOSE:To make electrodes of a platen cover transparent or colored and detect the size of an original without the preliminary scanning of an optical system by detecting the size detection of the original with the electrodes of the platen cover before photoscanning. CONSTITUTION:Electrodes 31a-31c provided to the platen cover 3 and an electrode 32 provided to an original platen 2 constitute a circuit as shown in a figure. When the original D is placed on the original platen 2 and pressed with the cover 3, the electrodes 31a-31c contacts the electrode 32 and the size of the original D is detected from an electricity fed area. When the original D is of B5 size, all the electrodes 31a-31c contact the electrode 32 to feed electricity. Information corresponding to it is inputted to a detector, a comparing circuit decides on the size, and a control circuit generates a command for supplying a form of B5 size. Similarly, originals of other size, e.g. A4, B4, and A3 are detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a document size detection device for a copying machine such as an electrophotographic copying machine, which detects the size of a document placed on a document table.

[Prior art]

Conventionally, in copying, sheets of different sizes or rolls of paper are loaded and paper of an appropriate size is selected or cut and fed according to the size of the original placed on a document table. The machine is known from Japanese Patent Laid-Open No. 11242/1983. The W document size detection device in such a copying machine has a projection device R or a photoelectric conversion device mounted on the document holding cover (platen cover) and the lower surface of the document table, respectively, in the diagonal binding direction of the document placement. arranged in parallel so that
This is similar to detecting the document size based on the size information of the outputs of parallel photoelectric conversion devices.

In such a document size detection device, the photoelectric conversion device is affected by variations in the sensitivity of parallel photoelectric conversion devices, variations and fluctuations in the light emission strength of the projector, and even external light that leaks through the gap between the platen cover and enters the photoelectric conversion device. The size information of the output may give information different from the size of the original, which may cause a malfunction in paper selection speed.

In addition, since either the light projector or the photoelectric conversion device is installed on the platen cover that opens and closes, the light projector or the photoelectric conversion device located on the outside of the document placed on top can easily cause damage. This causes an inconvenience in that the particles are transferred onto the transfer paper.

Furthermore, Japanese Patent Publication No. 110837/1983 has proposed a method for detecting the size of a document that does not require the opening and closing operations of such a device.

That is, in this proposal, a steel surface portion with a specific reflection directionality is formed on the surface of the document valve cover that comes into contact with the document,
The document size is detected by counting the time from the start of the optical system until the irradiation light from the exposure lamp that has scanned the document surface reaches the steel surface of the document valve cover, is reflected, and is received by the photo sensor. It is carried out.

However, in this proposal, the W and document size can only be detected after the N-printing side is exposed, so in order to supply paper of the appropriate size for the document size, the optical system must scan in advance before copying. Must be.

In addition, the manuscript cover is generally made from a flexible material, and therefore the angle of the steel surface part tends to fluctuate, resulting in inconsistent reflection directivity and variations in the output of the 7 otosensors, which can lead to false detection. The sex is great.

On the other hand, several means have been proposed for detecting the document size without requiring preliminary scanning of an optical system.

First, the proposal in Japanese Utility Model Publication No. 56-145059 is to install a plurality of electrode members made of flexible material on portions of the manuscript cover surface corresponding to the respective manuscript sizes so that they can come into contact with the conductive manuscript glass. This is a method of detecting the document size by outputting an output according to the number of electrode members other than the crimped document surface that contact the document glass and are energized. If so, there is a drawback that the electrode member is imprinted through the document.

Furthermore, a plurality of colored parts are provided in portions corresponding to each original size on the manuscript cover surface, and a color sensor receives light from the colored parts that are not blocked by the manuscript, and the manuscript size is detected by the output of the color sensor. A method has also been proposed, but it has the disadvantage that it is not possible to detect the Iai document size of a transparent document or a document having the same color as the colored portion. Another option is to receive light from a light emitter embedded in the manuscript cover.
However, the same drawbacks as mentioned above cannot be avoided.

As described above, although many ideas have been made regarding document size detection devices for copying machines, each of them has its own problems, and the actual situation is that these devices have not yet reached a level of full satisfaction.

[Purpose of the invention]

The present invention eliminates the shortcomings and shortcomings of the above-mentioned conventional proposals for document size detection devices, always provides stable output, prevents false detection, and also enables size detection of transparent or colored documents. The purpose of this invention is to provide a document size detection device for a copying machine.

[Structure of the invention]

The present invention is configured to change the energization state between the power sources of the original glass and the original flap cover depending on the size of the original to be crimped, and to detect the original size based on the size of the original being crimped. In a copying machine equipped with a flap cover, a partial surface of either the original glass or the manuscript flap that is in contact with the original surface and corresponds to each original size, and the entire surface of the other, or at least a portion that is opposite to the partial surface. This is achieved by a document size detection device for a copying machine, which is characterized in that an electrode made of a conductive transparent member is provided on the surface.

[Example 5] Figure 1 is an example showing the state of a conductive transparent member provided on the document flap surface of a manuscript flap cover (platen cover).
A plurality of electrodes 31&
・31b and 31c are provided. FIG. 2 is a cross-sectional view showing one embodiment of the main part of the copying machine having the document flap shown in FIG. Note that 1a in Figures 1 and 2
is the document reading scanning start end.

At the top of the copying machine main body 1-, there are arranged a transparent original glass, ie, an original platen 2, on which the original plate is placed, and a platen cover 3, which covers the original p after placing the original plate on the original platen 2. . Furthermore, in the present invention, the electrodes 31 a to 3 of FIG.
On the other hand, on the document placement surface 2a of the document placement table 2, an electrode 3 made of a conductive transparent material is provided over the entire surface of the document placement surface 2a so as to face the electrodes 31a to 31c.
2 (not shown) is provided.

A first mirror unit 6 equipped with an exposure lamp 4 and a first mirror 5 is provided below the document table 2 and inside the copying machine body 1, and is arranged parallel to the document table 2 and on the left and right sides of the drawing. It is attached so that it can move linearly in the direction, and optically scans the entire surface of the document tray.

7 and 8 are a second mirror and a third mirror, respectively, and the second mirror unit 9 in which these mirrors are integrated is linearly moved in the left and right direction at a speed of % of that of the first mirror unit so as to maintain a predetermined optical path length. do. Of course, the movement of the second mirror unit 9 is parallel to the original table 2, like the first mirror unit. The reflected light from the original on the original placing table 2 is reflected by the first mirror 5, the second mirror 7, and the third mirror 8, and further passes through the main lens 10 and the fourth mirror 11 to the photosensitive image support. The light enters the body drum leg through a slit S provided near the document surface.

On the other hand, the electrodes 31 & to 3 provided on the platen cover 3
1c and the electrode 32 provided on the original platen 2 are the third
The circuit shown in the figure is configured, and when the original is placed on the original placing table 2 and crimped by the platen cover 3, the electrodes 31a to 31c and the electrode 32 come into contact with each other and become energized. The size of the document paper is detected accordingly.

That is, when the original document placed thereon is 85 size, the electrode 31
Since all of the paper sheets a to 31c are energized by contact with the electrode 32, the corresponding information is input to the detection device, the size is determined by the comparison circuit, and the control circuit determines whether paper equivalent to 85 size is supplied. It is a trap so that orders can be issued.

Similarly, in the case of A4 size, 84 size, and A3 size, information from different combinations of electrodes is input to the detection device, and sheets corresponding to the respective sizes are fed.

Therefore, since the size of the document is detected before optical scanning, there is no need for preliminary scanning of the optical system as in the conventional example, and therefore the detection is performed at the same time as the start of copying, or when the lighthouse is turned on while the main switch of the copying machine is turned on. This is done at the same time as the platen cover 3 is closed, and it becomes possible to select and supply paper of a desired size.

Note that the electrode 32 may be formed by directly depositing a transparent conductive material such as indium oxide or palladium oxide on the surface of the document glass. Further, the electrodes 32 and 31a to 31c provided on the platen cover 3 are suitably made of a PET base of 1100βrr or less and a transparent conductive material such as indium oxide or palladium oxide deposited thereon.

In addition, electrodes (31a, 31bν) provided on the platen cover 3
31C), even if a conductive member of white color or the like having the same reflectance as the platen cover 3 is used, it is considered to be transparent. In this case, in this application, a white conductive member is also referred to as transparent.

〔Effect of the invention〕

The present invention makes it possible to detect the size of a document without requiring preliminary scanning of one optical system, and also detects the size of colored documents or transparent documents, and detects defects such as imprinting of the detection member. We have decided to provide a document size detection device for copying machines that does not require a copying machine.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the state of the electrodes provided on the N document holding surface of the document holding cover. FIG. 2 shows the optical system of a copying machine equipped with a document size detection device according to the present invention. A sectional view shown. FIG. 3 is a circuit diagram of the detection device. 1...Copy machine body 2...Document placement table 2a...Document placement surface 3...Document holding cover 3a...Document holding surface 4...・・Exposure lamp 5,
7.8.11...Mirror 6.9...Mirror unit 10...Main lens Group... Group/Photosensitive drum D...Document S...Slit Agent Patent Attorney No 1) Father-in-law Figure 1 Figure 3 ■ Procedural Amendment 1, Case Display Copying Machine Document Size Detection Device 3, @, Correct Person Relationship with the Case Patent Applicant Address Shinjuku, Tokyo Ward Nishi-Shinjuku 1-26-2 Name (1
27) Roku Konishi Photo Industry Co., Ltd. 4, Agent 191 Address 1-5 Sakura-cho, Hino-shi, Tokyo, Date of amendment order Vol. 6, “Claims” and “Details of the invention” Contents of the amendment (1) The "Claims" of the specification will be amended as shown in the attached sheet. (2) In the first line of page 6 of the specification, the phrase [an electric conductor made of an electrically conductive transparent member on the facing part surface] has been replaced with 'an electric conductor made of an electrically conductive transparent member on the opposite part surface'. I am corrected. (3) On page 6, line 6 of the specification, the phrase "transparent member" is corrected to "transparent member that is a transparent member." (4) On page 9, line 14 of the specification, it says "transparent even when used" [transparent without substantially forming an image of the conductive member even when used]
I am corrected. (5) On page 9, line 16 of the specification, the word "transparent" is corrected to read "1. Conductive transparent member." Attached Patent Claims A copying machine equipped with a document glass and a document holding cover, a partial surface corresponding to each document size of either the document glass or the document holding cover that is in contact with the document surface, and the entire surface or the other surface. A document size detection device for a copying machine, characterized in that an electrode made of a conductive transparent member is provided on at least a partial surface opposite to the partial surface.

Claims (1)

[Claims] 1 for copying machines equipped with a document glass and a document holder cover.
A conductive transparent member is formed on a partial surface corresponding to each document size of either the original glass or the original holding cover that is in contact with the original surface, and the other entire surface or at least a partial surface opposite to the partial surface. A document size detection device for a copying machine characterized by being provided with an electrode.