JPS626240A - Original size detecting device for copying machine - Google Patents

Abstract

PURPOSE:To detect the size of an original securely by providing an original size detecting means for the case of the use of an ADF, and inputting a signal from the detecting means to a main body and judging the original size from whether there is an original in the tray of the ADF or not. CONSTITUTION:The tray 15 of the ADF 3 where an original is set is provided with original control guides 16 and 17 which are slidable and adjustable according to the size of the original and a switch 18 almost at the center part of the tray 15 for the detection of the original size using the ADF 3, which operates when long paper is set in the tray 15. Further, a switch 20 which detects an original being set is provided at the inner side of the tray 15. A reed switch provided in the tray is operated by magnets fitted to to front ends of reverse surfaces of the original control guides 16 and 17 as the original control guides 16 and 17 of the tray are slid, thereby detecting the width of the original. Therefore, when the original is set in the tray 15, the size of the set original can be detected from the combination of the positions of the original control guides 16 and 17 and the switch 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying machine original size detection device for automatically detecting the original size in an electrostatic transfer type copying machine.

Conventional technology In the past, electrostatic transfer copying machines detected the size of the original to be copied and automatically selected the copy paper.
Alternatively, as a method for detecting the original size in order to automatically set the copy magnification, the first method is to use an AI)F (automatic document feeder) to detect the width and length of the set original. There is a way to determine the original size by

The second method is to place the original on the platen glass and irradiate light from the bottom of the platen glass to separate the light reflected from the placed original and the light reflected from the platen cover in the area where there is no original. There is a way to read the size of the original from the difference. In this case, it is necessary to color the document platen cover that covers the document a light yellow or blue color in order to differentiate it from the white document.

Problems to be Solved by the Invention In the first method described above, the original to be copied must be
It is necessary to pass the document through the F device, otherwise it is difficult to judge the document size.

In addition, in the second method, the yellow or blue color of the manuscript cover is
Since the copied image is copied with tingling and tingling, faint lines appear around the image. Particularly when using an ADF, there are two disadvantages: - One problem is that the document feed belt of the ADF must be colored yellow or blue, and the document feed belt of the ADF may be slightly tilted or misaligned. If the copy is sent in, a dirty black stain will appear around the copy, which is undesirable.

The present invention makes it possible to reliably detect the document size even when using a copying machine with an ADF or when copying by placing the document directly on the glass platen without using the ADF. Another object of the present invention is to provide a copying machine document size detection device that prevents stains from appearing around the document even if the document is misplaced.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a first document size detecting means that detects the size of the document from the bottom surface of the document platen glass, and a first document size detecting device that detects the size of the document from the bottom surface of the document platen glass. and second document size detection means for detecting the size of the set document, and when a document is set in the DF device, the second document size detection means detects the size of the document. If the size of the original is not set, the first original size detection means detects the size of the original.

Effect of the Invention According to the above-described structure, the present invention can reliably detect the size of a document whether the copying machine is equipped with a DF and copies without using an ADF. can.

Example Examples of the present invention will be described below.

FIG. 1 is a schematic cross-sectional view of a copying machine according to the present invention. In the figure, 1 is the main body of the copying machine, 2 is the original platen glass provided at the top of the copying machine main body, 3 is the mu DF installed to cover the original platen glass 2, and the ADF 3 is the document transport section. As shown in Figure 3, it can be opened and closed using the back side as the fulcrum of the hinge. On the inside of the main body 1 below the original glass plate 2 is an exposure lamp 5 which scans and exposes the original 4 placed on the original glass plate 2. Optical means consisting of a mirror 6 and a lens 7 is provided. A light emitting element 8 as shown in FIG. 6 is placed below the optical means so that it does not interfere with the movement of the optical means. As shown in FIG. 2, there are four original size detecting elements 12 (one
2a, 12b.

12 (j, 12d) are arranged.

As shown in FIG. 4, the light emitted from the light emitting element 8 is focused and formed into an image on the top surface of the document glass 2, and if there is an original 4 on the top surface of the document glass 2, this document 4 The reflected light is collected by the lens 1o, and the light receiving element 11 can detect the presence of the document. ADF3 as shown in Figure 3
When the is in the open state, if there is no original on the document platen glass 2, the light from the light emitting element 8 passes through the document platen glass 2 and does not return to the light receiving element 11. No signal can be detected. 9 As shown in FIG. 2, the document size detecting element 12 is arranged. For example, in the case of a M4 size document, the detecting element 12a,
12b and 12c output the document recess signal, and 12c,
12d indicates that there is no document, so this document can be detected as a M4 size document. Similarly, the sizes of B5, B5 horizontal, Mu4, Mu4 horizontal, B4, and Mu3 can be detected in the same manner. Next, in the present invention, as shown in FIG. 3, a switch 13 is provided in the copying machine main body 1 for detecting that the DF is in a closed state, and when the DF 3 is open, a detection element is provided. 12&, 12b, 120, and 124 are always working to detect the document size. When the mu DF3 is closed, the document 40 part and the paper conveyance belt 14 part of the mu DF3 are both white because there is no document 4, so the detection element 12&,
12b.

120.12d cannot be detected. The document size is detected by the detection element 12a immediately before the switch 13 is closed.

The signals are read from signals 12b, 120, and 12d. Therefore, the switch 13 is not activated when the ADF 3 is completely closed, but after a certain period of time. Note that the switch 13 may be provided in the ADF 3.

Next, the detection of the document size using the person D"F3 will be explained. As shown in FIG. , 17 and a switch 18 located approximately in the center of the tray 16, the switch 18 is activated when a long sheet of paper is set on the tray 15. Also, an original is set on the back side of the tray 16. There is a switch 20 that detects when the tray document regulation guide 16°17
As it slides, a reed switch provided inside the paper tray is activated by magnets attached to the bottom surface of the tips of the document regulation guides 16 and 17, so that the width of the document can be detected.

Therefore, when a document is set on the tray 15, the size of the set document can be detected by the combination of the positions of the document regulation guides 16 and 17 and the switch 18.

When a document is set in the ADFs, a document size signal is transmitted from the human DF 3 to the copying machine main body 1, and paper selection or magnification selection is performed. If no original is set on the tray 16 of the ADF 3 and a person sets the original 4 with the DF 3 open as shown in Figure 3, the detection element 12 detects the original size, and the size of the original is detected before the switch 13 is activated. The selected original size is transmitted to the main body of the copying machine, and paper selection or magnification selection is performed.

If the copy start button on the copying machine main body 1 is pressed while the copying machine DFs is not closed, the size signal of the detection element 12 at the time the copy start button is pressed is transmitted to the main body.

Effects of the Invention As detailed above, the present invention is a copying machine equipped with an ADF,
A document size detecting means is provided when a human DF is not used, and a document size detecting means is used when a human DF is used, and the signal from which detection means is to be taken into the main body is determined based on the presence or absence of a document in the tray of the mu DF. That's what I do.

With this configuration, the size of the original can be detected even when the DF is not used in a copying machine equipped with a shim DF, and there is no need to color the original feed belt of M I). No unnecessary black lines are copied around the edges.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a copying machine according to an embodiment of the present invention, FIG. 2 is a layout diagram of a detection element of a first document size detection means of the embodiment, and FIG. FIG. 4 is a cross-sectional view of the detection element of the first document size detection means of the same embodiment, and FIG. 6 is a perspective view of the document tray section of the human DF of the same embodiment. be. 1...Copy machine body, 2...Original platen glass, 3...ADF, 4...Original, 12
. . . Detection element of first document size detection means, 1
5...MDF) Ray, 20...Document detection switch. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Figure 2 3rd Flash

Claims (1)

[Claims] A document provided to cover the document table glass, including a plurality of document size detectors that emit light from the lower surface of the document table glass and detect reflected light from the document placed on the glass surface. a first document size detection means configured to detect the document size when the automatic document feeder is in an open state; and a first document size detection means provided in the automatic document feeder to detect that a document is set in the automatic document feeder. and second document size detection means for detecting the size of the set document, and when a document is set in the automatic document feeder, a signal from the second document size detection means is transmitted. and when no document is set in the automatic document feeder, a signal from the first document size detection means is transmitted and a copying operation is performed. Detection device.