JPH0218573A - Copying machine - Google Patents

Abstract

PURPOSE:To eliminate the need for operating a selection switch by an operator and to improve the operation efficiency by providing a sensor which detects an edge corresponding to the size of a document setting part at the document setting part and selecting a form cassette corresponding to the size with the output of the sensor. CONSTITUTION:Photoelectric sensors 31 and 32 are in a copying machine main body 11 and cooperate with reflecting plates 41 and 42 of a platen cover 24 when documents of B4 size and A3 size are placed to stop the output by interrupting specific reflected light. Namely, A3 is decided when both sensors stop, B4 is decided when only the sensor 31 stops, and A4 is discriminated when both generate outputs. A selection part 50 detects the document size as mentioned above when the platen cover 24 is closed to select copying form cassettes 21, 22, and 23 of A4, B4, and A3 automatically. Therefore, the operator only depresses a start switch to take a copy on a copying form matching the document size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying machine having a plurality of cassettes each containing copy sheets of various sizes.

[Conventional technology] FIG. 3 is a schematic structural diagram showing a conventional example of a copying machine.

This conventional copying machine 2 includes a copying machine main body 11, cassettes 21, 22, and 23 containing copy sheets of A4 size, B4 size, and A3 size, respectively, and a platen cover 2.
4, a photosensitive drum 61, a developing section 62, a light source 71,
Mirror 72.73, γ4.75, and transport heald 81,
The original sandwiched between the copying machine main body 11 and the platen cover 24 is copied onto copy paper using rollers 82, 83 and the like.

When copying a document using the copying machine 2, the operator operates a cassette selection switch (not shown) to select the paper size, that is, the cassette 21, 22, or 23, and then opens the platen cover 24. After setting the original in a predetermined location, the platen cover 24 is closed and a start switch (not shown) is pressed. When copying with a different paper size, the operator operates the cassette selection switch and selects again.

[Problem to be solved by the invention]

The above-mentioned conventional copying machine has the disadvantage that when copying with a different paper size, the operator has to operate the cassette selection switch each time to reselect the cassette, making it easy to make mistakes in selection and lower work efficiency. There is.

[Means to solve the problem]

In the copying machine of the present invention, when an original of each size is set, one edge of the original of each size is provided at the desired position, and when the edge of the original reaches the provided position, the edge is detected. The apparatus includes a sensor that outputs a detection signal, and a selection section that determines the size of the document set based on the detection signal output from the sensor and selects a cassette corresponding to the determined size.

[Operation] The selection unit determines the size of the original based on the output from the sensor installed where one edge of each size of original should be, and selects the copy stored in the cassette corresponding to the determined size. Since the paper is selected, even when copying with a different paper size, the operator does not have to operate the cassette selection switch each time to make a new selection.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic structural diagram showing an embodiment of the copying machine of the present invention;
FIG. 2 is a perspective view showing the appearance of essential parts of the embodiment shown in FIG. 1.

The copying machine 1 of this embodiment is different from the conventional copying machine 2 shown in FIG.
A photoelectric sensor 31.32 having a light emitting means, a reflection plate 41.42, a microswitch 43, and a selection section 50
This is the addition of

The photoelectric sensor 31 is provided in the copying machine main body 11 at a location where one edge (fixed side edge) of the set B4 size original S should come when a B4 size original S is set. ing. The reflection plate 41 is attached to the inside of the platen cover so as to face the photoelectric sensor 31 when the platen cover 24 is closed. Similarly, the photoelectric sensor 32 is located in the copying machine main body 11 at a position where one edge (fixed side edge) of the set A3 size original S should be when an A3 size original S is set. It is set in. The reflective plate 42 is attached to the inside of the platen cover so as to face the photoelectric sensor 32 when the platen cover 24 is closed.

The light output from the photoelectric sensors 31.32 is reflected by the reflecting plates 41.42, and when the reflected light is input to the photoelectric sensor 31.32, the photoelectric sensor 31.3
2 does not output a signal.

When the edge of the document S comes to the location where the photoelectric sensors 31 and 32 are provided, there is no reflection of light by the reflective plates 41 and 42, so the photoelectric sensors 31 and 32 detect the edge of the document S and detect it. Each outputs a detection signal indicating that the The microswitch 43 detects whether the platen cover 24 is closed or open, as shown in FIG.

When the microswitch 43 detects that the platen cover 24 is closed, the selection unit 50 selects the photoelectric sensor 31 .
The output of the detection signal No. 32 is monitored. Then, the selection section 50
When neither of the photoelectric sensors 31 and 32 is outputting a detection signal, the document S is considered to be A4 size, and when only the photoelectric sensor 31 is outputting a detection signal, the document S is considered to be B4 size. Assuming that photoelectric sensor 31.32
When both output detection signals, the document S is considered to be A3 size. After that, the selection unit 50 selects a cassette 21 that is a cassette corresponding to the respective determined size.
．． Select 22 and 23 respectively.

When the selection unit 50 selects one of the cassettes 21, 22, and 23, the operator can copy the document S onto copy paper that matches the size of the document S by simply pressing the start switch and without operating the cassette selection switch. .

Note that in this embodiment, the document S is detected by whether the reflection plate 41.42 reflects the light output from the photoelectric sensor 31.32, or even if the reflection plate 41.42 is not used, for example, the platen The light reflection coefficient of the cover is
It is also possible to detect the document S based on the difference in their reflection coefficients.

Further, without using the microswitch 43, the selection unit 50 may select each cassette when the platen cover 24 or the document S is detected by a sensor or the like.

[Effects of the Invention] As explained above, the present invention is such that the selection section determines the size of the document based on the output from the sensor provided at the position where one edge of the document of each size should come. By selecting the copy paper stored in the cassette that corresponds to the paper size, even when copying with a different paper size, the operator does not have to operate the cassette selection switch each time to reselect the paper, which eliminates the need to make a selection mistake. This is unlikely to occur and has the effect of improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram showing an embodiment of the copying machine of the present invention;
FIG. 2 is a perspective view showing the appearance of essential parts of the embodiment shown in FIG. 1, and FIG. 3 is a schematic structural diagram showing a conventional example of a copying machine. DESCRIPTION OF SYMBOLS 1... Copying machine, 11... Copying machine main body, 21.22.23... Cassette, 24... Platen cover 31.32... Photoelectric sensor, 41.42... Reflection plate, 43 ... Micro switch, 50 ... Selection section, 61 ... Photosensitive tram, 62 ... Developing section, 71 ... Light source, 72.73.74.75 ... Mirror 81 ... Conveyance belt , 82.83...roller, 8...manuscript.

Claims (1)

[Claims] 1. In a copying machine that has multiple cassettes containing copy paper of each size, when originals of each size are set, one edge of each size of original is placed at the desired position, When the edge of the document comes to the edge of the document, a sensor detects the edge and outputs a detection signal, and the size of the document set is determined based on the detection signal output from the sensor, and the document is adjusted to the determined size. A copying machine characterized by having a selection section for selecting a corresponding cassette.