JPS59159152A - Original size detector of copying machine - Google Patents

Abstract

PURPOSE:To simplify the constitution of the titled device and to produce the device economically by arranging detectors detecting respective original size in the rectangular direction to the carrying direction of the original. CONSTITUTION:The original size detector has a light emitting part 8 consisting of a light emitting diode, etc. and a photodetecting part 9 consisting of a photosensor or the like receiving the reflected light projected from the light emitting part 8. The light emitting part 8 and the photodetecting part 9 include a pair of a light emitting part 8a and a photodetecting part 9a for detecting the minimum original size on the center line of the original carrying direction and the light emitting parts 8b-8d and the photodetecting parts 9b-9d detecting other original size are arranged in the rectangular direction to the original carrying direction. Consequently, the constitution is simplified and the device can be produced economically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a document size detection device for detecting the size of a fed document in an automatic document feeder of a copying machine.

[Prior art]

Conventionally, this type of device has a structure as shown in FIG. 1, for example.

111J, on the document insertion table (23) of the automatic document feeder (22) provided on the top surface of the copying machine main body (21), mark a mark in the document feeding direction and in a direction perpendicular to the center line in the document feeding direction. Two manuscript guides that can move forward and backward symmetrically with each other.
This is a structure in which (24) and (24) are provided.

Such a device guides a document inserted into a document insertion table (23) to a predetermined position according to the document size by moving a document guide (24).
) by detecting the stop position using, for example, M/S, etc.
This is to detect the size of the original.

However, since the conventional document size detection device detects the document size from the stop position of the guide plate, an electronic device is required to measure the moving distance of the guide plate, which makes the configuration complicated and The problem was that it was expensive.

[The invention was made in order to solve the above problems,
The object of the present invention is to provide an improved document size detection device that has a simple configuration and is inexpensive.

[Structure of the invention]

In order to achieve the objective of the present invention, a detection device is provided according to each document width, and the detection device for detecting the minimum document width is located at a position corresponding to the width of the document. and each of the detection devices for detecting other document sizes is placed at a corresponding position between the side edge of the document and the side edge of the same side of the document that is one size smaller than the document size. It is designed to detect the size of each document.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. FIG. 2 shows a sectional view showing an example of the present invention.

In FIG. 2, number (A)::B5. A4. B.l.

This figure shows the main body of the copying machine that can copy Δ3 Zeiss originals, and the automatic document feeder (B) is installed on the top.
have. The automatic document feeder (B) mainly uses a guide section (C) that guides the document to a predetermined position during document insertion F.
), and a platen part (D) that transports the original from this guide part (C) onto the platen of the copying machine main body (A).

As shown in Fig. 3, the chi [section (C) has two guide plates (1+, Fl) parallel to the document feeding direction; It moves forward and backward in the right angle direction and symmetrically with respect to the center line in the document feeding direction. It functions to guide the original to a predetermined position corresponding to the original size.

The platen part (D) is located inside the cover (2) and is provided with a feed roller (3) on the side surface of the guide root (1), and the side surface of the roller (3) protrudes or recesses into the floor surface. In addition to providing a gate (4), on the upper surface of the platen glass (5) on the side of the gate (4), a -21 roller f6) is provided with a -rut (7) wound around (6). ing.

On the inner wall of the cover (2) between the guide plate (1) and the feed roller (3), there are a plurality of light emitting sections (8) each consisting of a pair of light emitting diodes, etc., and a light emitting section that emits light from the light emitting sections. Multiple light-receiving units (9) consisting of bottom sensors, etc. that receive reflected light (reflected when there is a document)
have.

These light emitting parts 01 (8) and light receiving parts (9) are connected to a pair of light emitting parts (8a) and light receiving parts (9) for detecting the minimum original size on the center line in the feeding direction of the original, as shown in No. 3 and 1.
9a), and further includes pairs of light emitting units (8b) to (8d) and light receiving units (9b) to (9d) for detecting other document sizes in a direction perpendicular to the document feeding direction.
) are arranged. The light-emitting section and the light-receiving section are arranged at positions corresponding to each other between the side edge of the document and the same side edge of the document that is one size smaller than the document. In addition, the light emission 01 ((8a)) for detecting the minimum original size
Although an example is shown in which the light receiving section (9a) is provided on the center line in the document feeding direction, the present invention is not limited to this, and any position corresponding to the width of the document may be used. These devices function as a detection device that detects the size of each document.

Next, the action will be explained.

First, place the original on the guide section (C) and place it on the guide plate (1).
), +11 to guide the document to a predetermined position corresponding to the document size. At this time, the document is guided so that its longitudinal centerline and the document feeding direction centerline of the platen portion (D) coincide.

Next, the functions of the light emitting section (8) and the light receiving section (9) will be explained. First, fal in Figure 3 is a B5 size original, t
b+ is A4 size, (C1 is B4 size, (d) is A3 size
This shows the size of the manuscript.

Now, suppose that a B5 size document (al) is guided to a predetermined position by the guide section (C)-H, the light from the light emitting section (8a) is reflected on the document (al), and this reflected light is sent to the light receiving section (9a). Also, since there is no document, the light from the other light emitting parts (8b) to (8d) is not reflected, and the light from the corresponding light receiving parts (9b)
) to (9d) do not receive light.

The size of the B5 original can be detected by the light reception signal of the light receiving unit (9a), and this reception signal is further sent to a paper selection device (not shown) to select the B5 paper in the chair that is the same as the ζ original. It is something to do.

Next, when the document tb+ of the Δ4 cylinder is moved to a predetermined position by the guide part (C)-H, the reflected light from the light emitting parts (8, 1) and (81)) is sent to the light receiving part (9a). (!:(
9b) receives the light. This detects that the paper is A4 size, and similarly selects A4 size paper. Furthermore, in the case of a 349-size original (C), each of the light receiving sections (9a) to (9c) receives the light, and in the case of an A3 size original (d+), the light receiving section FJ8 (9a) receives the light, respectively.
) to (9d) are received. Then, in the same way, the original and the chair are detected, and the paper of the same size as the original and the chair is selected.

This one throw, the document is at its tip H ((Ka feed) - Ra (3)
By this, it is transported until it hits the ``C'' (4th hole).

Then, it caves in at the timing when a predetermined position of the photosensitive ram (not shown) is exposed to light such as characters 9 and 9 of the original. As a result, the document is transported by the feed roller (3) to the paper-grabbing position of the feed roller (71), and further transported to a predetermined position on the platen glass (5) by the feed roller (7).

In addition, in the example, B5. A4. B4. An example of detecting an A3 size document is shown as L7, but is not limited to this, for example, B6. When detecting a document with a size such as 〇,
The light-emitting section and the light-receiving section may be provided at positions centered on the size.

〔Effect of the invention〕

As explained above, according to the present invention, since a detection device is provided corresponding to each document chair, the structure is simple and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional document size detection device, FIG. 2 is a sectional view showing the configuration of an embodiment of the present invention, and FIG.
As shown in the figure, it is a plan view of the main body 91 (A); copying machine body (B); automatic document feeder (C)
;Guy part (D);Platen part (1);Guy I
・Plate (2); Cover (3); Feed roller
(4): Gate (5), platen glass (6); Roller (7); Hell 1- (81, (8a) - (8d); Light emitting part + ri),
(9□1) ~ (9d,); Light-receiving section patent applicant Fuji Xerox Co., Ltd. agent Masu Tebori (No. 9 [or 2 people)] Patient 1 Figure 2 ＼ 38.1

Claims (1)

[Claims] 1. In an apparatus having two guide plates on both sides of the document insertion table that move forward and backward in the direction perpendicular to the document feeding direction and symmetrically with respect to the center line in the document feeding direction, Detecting devices for detecting the respective document sizes are arranged in a direction perpendicular to the document size, and the detecting device for detecting the minimum document size of the detecting devices is arranged at a position corresponding to one depth of the document, and A copying machine characterized in that each of the detection devices for detecting the document size is disposed at a position corresponding to between the (Jl11 edge of the document and the same side edge of the document that is one size smaller than the document size). Original size detection device.