JPH0117551Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a paper feeding device, for example, one that separates and feeds stacked copy sheets one by one in accordance with the copying process, or separates a series of copy originals one by one and places them on the original set surface. The present invention relates to a paper feeding device that sequentially feeds sheets stacked on top of each other.

Generally, in this type of device, paper stacked and stored on a paper tray is fed out one by one using a conveying means such as a roller or a belt, and the paper is separated one by one by a separating means and fed to the main processing device. In order to ensure reliable separation by the means, a feeding means on the paper table is arranged so as to be movable in the vertical direction perpendicular to the feeding direction, and this feeding means feeds out the paper while handling it in the vertical direction. It has been known.

Various methods are known for vertically sorting and feeding, such as using an eccentric roller, a semicircular roller, a polygonal roller, or a plate-like tongue that swings vertically.

However, in the case of a device in which a feeding rotation means such as an eccentric roller is buried in the loading surface of the paper loading table, and this rotating means rolls up and down to scrape out the bottom paper, when the paper runs out, the loading surface When replenishing paper on top of the paper, the rotating means may protrude upwards, making it impossible to set the paper or causing the leading edge of the paper to fold. However, there is a problem in that the tip gets caught on the edge of the mounting surface in which the rotation means is embedded, causing the tip to break. The present invention solves this drawback by detecting when there is no more paper on the paper loading table and causing the feeding rotation means to stand by at the lowered position. It is set in a position where it is easy to
The main purpose of the present invention is to provide a paper feeding device that can correctly set paper during replenishment without getting stuck.

To achieve this purpose, the present invention includes a feeding rotation means 2 connected to a drive motor that sequentially feeds the sheets 3 set on the loading surface of the paper loading table 1 from the lowest layer toward the separating means 4. It is constituted by a rotating means such as an eccentric roller whose center of rotation is displaced between a raised position where it protrudes from the loading surface of the paper loading table 1 and engages with the set paper, and a lowered position where it is retracted from the loading surface. , a paper presence/absence sensor S1 for detecting whether the paper set on the paper loading table is empty, and a position sensor S2 for detecting the rotational position of the delivery rotation means are provided respectively, and the paper empty signal from the paper presence/absence sensor S1 and the paper delivery sensor are provided. The control means of the drive motor is controlled to stop the eccentrically rotating delivery rotation means 2 at almost the same position as the mounting surface of the mounting table 1 when the paper is empty based on the position detection signal from the position sensor S2 of the rotation means. It is a combination of sensors.

The configuration will be described in detail below based on one embodiment shown in the drawings.

Figure 1 is a paper tray, which consists of a normal paper tray.
A stack of paper 3 is stored thereon. Reference numeral 2 denotes a feeding rotation means (hereinafter referred to as feeding means) disposed on the paper mounting table 1, which engages with the lowest layer of paper on the paper mounting table 1 and sends it out to the separating means 4 side.

Although various types of separating means 4 can be used, the one shown in the drawing is composed of a rotating roller 4a rotating in the direction of the arrow in FIG. 1 and a fixed roller 4b pressed against the rotating roller 4a. The fixed roller 4b may be replaced by a friction pad or a roller that rotates in the opposite direction with respect to the paper feeding direction.

Further, the separation means 4 may be a so-called vacuum separation such as a vacuum nozzle backup.

Therefore, the feeding means 2 feeds out the lowest layer of paper sequentially to the separating means 4 side, and after the separating means 4 separates the sheets one by one, the feed roller feeds them to the main unit, for example, a conveyor belt provided on the original set surface of a copying machine. ing.

In the present invention, the feeding means 2 is configured to be vertically movable in a vertical direction different from the paper feeding direction on the left side of FIG. When there is no paper, this feeding means 2 receives a signal from the paper presence/absence detection sensor S.
is retracted to the same lowered position as the paper placement surface 1a.

In the case shown in FIG. 1, an eccentric roller is used as the feeding means 2, and is connected to a drive motor (not shown) so as to rotate in the direction of the arrow. Therefore, the paper on the paper tray 1 is separated by the separating means 4 by this roller.
At the same time as it is sent out to the side, it is lifted up and down at right angles and handled.

Separately, a sensor _S1 for detecting the presence or absence of paper is provided on the paper tray 1 in a normal configuration, and a cam 5 for indicating the rotational position is provided integrally on the shaft 6 of the feeding means 2. A position sensor _S2 is in sliding contact with this cam 5.

Therefore, when the paper presence/absence detection means _S1 on the paper tray detects the absence of paper, it rotates the drive motor of the feeding means 2, and when the feeding means reaches the lowered position shown in Fig. 2, the position sensor _S2 detects this. paper presence sensor S ₁ and position sensor S ₂ to stop the drive motor.
is connected to the control means of the drive motor.

Then, the feeding means 2 is retracted from the paper mounting table 1, and the operation of loading the paper onto the paper mounting table 1 becomes easy.

In other words, when setting paper on the paper tray 1 as shown in FIG. 3, the feeding rotation means 2 stops and waits at the same position as the paper mounting surface 1a when the paper is empty. By inserting a bundle of sheets along the placement surface 1a, there is no fear that the leading edge of the sheet will be caught by the feeding rotation means 2, and there is no possibility that the leading edge of the sheet will be caught by the edge of the placement surface and cause the leading edge to break.

Since the present invention has the above-mentioned structure, there is no fear that the leading edge of the paper will be caught by the feeding means 2 on the paper mounting table 1 when the paper is set on the paper mounting table 1.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is an overall explanatory diagram thereof, FIG. 2 is an explanatory diagram of the operating state, and FIG. 3 is an explanatory diagram of the state when paper is set. 1...Paper loading table, 2...Feeding means, _S1 ...Paper presence/absence detection means.

Claims (1)

[Claims for Utility Model Registration] 1. A handling rotation means 2 connected to a drive motor that sequentially feeds the paper 3 set on the loading surface of the paper loading table 1 from the lowest layer toward the separation means 4. A rotation center that rotates the feed rotation means 2 between a raised position in which it protrudes from the loading surface of the paper loading table 1 and engages with the set paper, and a lowered position in which it is retracted from the loading surface. and a paper presence/absence sensor S1 for detecting whether the paper set on the paper loading table is empty, and a position sensor S2 for detecting the rotational position of the delivery rotation means, The paper empty signal from the paper presence/absence sensor S1 and the position sensor S of the feeding rotation means
When the paper is empty with the position detection signal from 2,
A sheet feeding device characterized in that a control means for the drive motor is provided for stopping the delivery rotation means 2 at substantially the same position as the mounting surface of the mounting table 1. 2. The paper feeding device according to claim 1, wherein the steering/rotating means is shaped to have an arcuate surface facing the paper mounting table at substantially the same position as the mounting surface of the mounting table 1.