JPS5978331A - Original size detector of copying machine - Google Patents

Abstract

PURPOSE:To select a form automatically by providing a detetor which detects the breadthwise length of an original and an arithmetic device which calculates the lengthwise direction of the original from the feed speed and feed time of the original inserted into an insertion opening. CONSTITUTION:Titled original size detector detects the breadthwise length of the original by shielding the original from light from a light emission part 5 when the original is inserted into the original insertion opening 3, and rotating a feed roll 6 for a specific time by the light shielding signal of a photodetection part 4 until the front edge of the original abuts on a gate 11. This device is equipped with the arithmetic device which calculates the lengthwise length of the original from the feed speed and feed time of the original inserted into the insertion opening. Thus, the breadwise length and lengthwise length of the original are detected, so a form of the same size with the original is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document rise detection device for detecting the size of a fed document in an automatic document feeder of a copying machine.

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

That is, on the document insertion table (23) of the automatic document feeder (22) provided on the top surface of the copying machine main body (21), there are two slopes that can move forward and backward in a direction perpendicular to the document feeding direction and in the same direction. Manuscript guide' (24), (24) set up &
It has a J structure.

Such a device guides a document inserted into the document insertion table (23) to a predetermined position according to the document size by moving/Using the document guide (24).
Each time the stop position in step 4) is detected by, for example, an M/S, the size of the document is detected and paper of the same size as the document is selected.

However, in conventional devices, the document size and size are detected from the stop position of the document guide (24), so the width of the document can be detected, but the length of the document in the depth direction cannot be detected. Can not. Therefore, for example, when reducing a document and making a -ζ copy, if only the length in the width direction of the document is detected,
It is difficult to automatically select the paper on the IJ chair, which is the same size as the original, and it is necessary to install a separate paper selection device.

The present invention has been made to solve the above-mentioned problems.The present invention has been made to detect the document size by automatically selecting the paper type each time the length of the document in the width direction and the depth direction is detected. The purpose is to provide equipment.

Hereinafter, the present invention will be explained based on a first embodiment shown in the drawings.

As shown in Figures 2 and 3, the light receiving section (4) of the photo sensor 9 is inserted into the document insertion slot (3) of the automatic document feeder (2) provided on the top surface of the copying machine main body (1). A plurality of light receiving parts (8) are arranged in a direction perpendicular to the document feeding direction.
) A plurality of light emitting units (5) of the photo sensor 1 to the sensor are similarly arranged in the automatic document feeder (2) in a direction perpendicular to the document feeding direction. The light from the light emitting unit (5) is projected onto the document inserted into the document insertion slot (3), and the length of the document in the width direction is detected.

FIG. 4 is a plan view of the present invention, and FIG. 5 is a sectional view thereof. As described above, the light receiving section (4) and the light emitting section (5) are respectively attached to the document insertion slot (3) of the automatic document feeder (2). J, further back there is a feed roller (6) for feeding the document. On the side of this feed roller (6), there is a - (7) for conveying the document, and the feed roller (
6) Transport the original sent by -ζ. The document holding section (-U in the figure) of this root (7) holds the document 11! A predetermined position (hereinafter referred to as the home position) of the transmission stop.

) is detected by a sensor (8).

λ of the document insertion slot (3) that enters the automatic document feeder (2)
・Universal join 1 (9
) is provided with a roller 00) driven by a drive source (not shown in the figure), and when the sense (8) detects that the heald (7) is not in the Baum position, , rotate the belt (7) U.,
Return to Baume position. In addition, (11) in the figure
indicates game 1-.

Next, the effect will be explained.

When a document is inserted into the document insertion slot (3), the document blocks the light from the light emitting section (5), and the feeding roller (6) rotates for a certain period of time due to the light blocking signal from the light receiving section (4), and the leading edge of the document is rotated for a certain period of time. hits the gate (11). At this point, feed roller (6)
will stop temporarily. Then, the light from the light emitting section (5) is blocked by the width of the document, and is received by the light receiving sections (4) on both sides of the document. Due to the dirt, the length of the 'l'l'ji force direction of the document is changed.

After this, the sensor (8) detects Hell I-+71 and -
, 1-+71 is not in the home position, the roller (io) rotates to return 1-(7) to the Baum position by 1μ. Here, the gear 1-(11) opens, the feed roller (6) rotates and sends the document to the belt (7), and the gear 1-(71) rotates.
The document is conveyed until its leading edge hits the registration of the copying machine main body fil.

The length L of the document in the depth direction is calculated using the following formula (1)% formula % However, t: Hell! - (After 71 starts rotating, the original f
Measured time V until the rear end in the feeding direction of ^ passes the light receiving section (4); Surface speed S of the heald; Distance from the original holding position of the heald 1- to the light receiving section (4) A calculation device (not shown) performs calculations to determine the length of the document in the depth direction. (Since V and S are fixed values, they are stored in advance in the arithmetic device.

L is measured by a timing device. ) Therefore, the length of the document in the width direction and the depth direction can be detected. This word makes it possible to automatically select the paper of the same size as the original, which has the effect of eliminating the need for a conventional paper selection device and simplifying the operation of the copying machine.

In addition, t in the above calculation formula is the actual measured time from when the gate (11) is opened until the first and second ends of the document pass through the light receiving section (4),
(2) may be the feeding speed of the original by the roller (6) and the roller (1-+71), and S may be the distance from the gate (11) to the light receiving section (4).

As explained above, according to the present invention, it is possible to automatically select a sheet of paper of the same size as the original by detecting the length of the original in the width direction and the depth direction.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional document ZAIS detection device;
The figure is a perspective view of a copying machine equipped with the present invention, and (+1.
(b) is an explanatory diagram of the main part of the embodiment shown in Figure 2;
The figure is a plan view showing one embodiment of the present invention, and FIG. 5 is a sectional view thereof. (1); Copy machine body (2); Automatic document feeder (3);
); Original insertion slot (4); Light receiving section (5); Light emitting section
(6); Feed roller (7); Hell I- (81, sensor (9); Uniper Lujoin l- 00); Roller (11); Qi 1- Patent applicant Fuji Xerox Co., Ltd. agent Hand digging
Benefit (2 idiots)

Claims (1)

[Claims] ■, A detection device that detects the widthwise length of the originals arranged perpendicular to the original feeding direction in the insertion slot for inserting the original, and a detection device that detects the widthwise length of the originals arranged in the direction perpendicular to the original feeding direction, and the feeding speed and feed of the original inserted in the above-mentioned Insertion I. 1. A document-<)-size detection device for a copying machine, comprising: an arithmetic device that calculates the length of the document in the depth direction from time.