JPH0441369A - Device for circulation feed of document - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention: FAT Industrial Field of Application The present invention relates to a document circulation feeding device which feeds the topmost document of a document stack and returns the returned document to the bottom of the document stack. Concerning improvements to the document bottom return unit.

(b) Conventional technology Copying machines that efficiently handle multiple sheets of originals (equipped with an automatic document feeder that feeds the originals in a stack one by one and sets them on the document table in order to copy them) One type of automatic document feeder is one that feeds the original at the top of the document stack and returns the copied document to the bottom of the document stack (original circulation feeder). ).

FIG. 4 shows the configuration of a conventional document circulation feeding device.

A bundle of sheet-like originals 52 is set on the original tray 51 . A paper feed roller 53 is located above the front part of the document tray 51.
is provided so that it can move up and down. The paper feed roller 53 descends when feeding the original, comes into contact with the stack of originals, and feeds the topmost original of the stack of originals to a document table (not shown). The document is exposed and scanned on the document table, and when the exposure process is completed, the document is returned to the bottom of the stack of documents 52 by a conveyance guide 54 and conveyance rollers 55 and 56.

(C1 Problem to be Solved by the Invention) However, in the conventional document circulation feeding device, as shown in FIG. There was a problem in that the paper collided with the stack of originals on top and formed a loop, resulting in a jam.

Note that Japanese Patent Publication No. 56-37536 discloses a device in which the entire document on the document tray is lifted by a rondo rotated by a motor when the document is returned from the document tray. There was a problem in that the configuration was complicated and the control thereof was also complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a document circulation feeding device that has a simple configuration and can prevent jamming when lowering a document.

+d1 Means for Solving the Problem The present invention provides an original circulation feeding device that feeds the topmost original of a stack of originals set on a document tray and inserts the returned original into the bottom of the stack of originals. A guide member is provided at the front lower part of the document tray, and the guide member is rotated by a rotating means from a position where the tip portion thereof pushes up the document on the document tray to a position where it does not touch the document, and the tip portion of the guide member It is characterized by being curved so that the inner surface faces toward the leading edge of the document on the document tray.

(e) Function In this invention, when the guide member is rotated by the rotating means to the position where the curved portion of the guide member pushes up the document on the document tray, the guide member moves the lower end of the document bundle and the surface of the document tray. A gap is formed in between. The guide member is provided so that the inner surface of the curved portion is on the leading edge side of the document bundle, and the returned document can be fed into this inner surface. In this state, the guide member is rotated to a position where it does not touch the original. At this time, the leading edge of the returned document is inserted into the lowest end of the document bundle. Therefore, the leading edge of the returned document will not collide with the leading edge of the document bundle to form a loop.

(G) Embodiment FIG. 3 shows a document circulation feeding device (R
DH) is a diagram showing the configuration of the DH.

A document tray 1 is provided in the upper left part of the RDH, and a stack of sheet documents 2 is set with the front surface facing upward. A paper feed roller 3 is provided at the front upper part of the document tray 1 so as to be movable up and down. The uppermost document in the document bundle is fed by the rotation of the paper feed roller 3, and sent to the first exposure section P1 via the feed section 4a. The first exposure section P1 is composed of a document table made of a transparent glass body, and exposes and scans an image on the surface of the document using an optical system (not shown) disposed below. Note that this optical system is fixed, and scanning by the optical system is performed by rotating the first cylinder 5a while the fed document is wound around the first cylinder 5a. The original whose front surface has been image scanned by the first exposure section is turned over in a switchback manner in the front-back reversing section 4b. If the document has images formed on both sides, it is wrapped around the second cylinder 5b and subjected to exposure processing on the back side in the second exposure section P2, and passes through the feeding section 4C to the document tray 1. returned to the bottom of the page. Note that in the case of a single-sided original, the optical system does not operate when the original passes through the second exposure section, and the exposure process for the back side is not performed.

Next, the configuration of the document return unit according to the present invention will be explained. 1st
Figure (A) is an enlarged view of the vicinity of the document tray.

A guide member 6 is attached to a fulcrum 6a at the front lower part of the document tray 1.
It is supported by and rotatably provided. Guide member 6
The tip of the document is curved into an arc shape, and the inner surface of the curved portion is shaped so as to face the tip of the document bundle, making it hollow. A rotatable roller 6 is provided at the tip of this curved portion 6b.
C is attached. This roller 6C is provided to improve the sliding of the guide member when it moves along the document, as will be described later. A solenoid 7 is attached to the rear end of the guide member 6. Further, a tension spring 8 is attached to the tip end side. When the solenoid 7 is turned on, the rear end of the guide member 6 is pulled and rotated about the fulcrum 6a, so that the leading end 6b pushes up the document bundle as shown in FIG. When the solenoid 7 is turned off, the spring 8 causes the guide member 6 to
The leading end 6b of the guide member 6 is pulled, and the guide member 6 no longer comes into contact with the document bundle, as shown by the solid line in FIG.

Note that 91 is a conveyance roller for feeding the returned original 2a to the bottom of the stack of originals, and 92 is the returned original 2a.
This is a conveyance roller for feeding the document to the rear end of the document tray 1. This conveyance roller 92 is a half-moon-shaped roller, and feeds the document 2a to a position exactly at the rear end in one rotation. Also,
Sensors Sl and S2 detect the returned document 2a, and are composed of an optical sensor, a micro-sinch, and the like.

The operation of the document feeder configured as described above when returning a document will be described. FIG. 2 is a flowchart showing the processing procedure.

When the exposure process is completed and the original 2a is returned to the original tray 1 side, the sensor S1 first detects this original 2a (n
l). Solenoid 7 is turned on in response to this document detection.
2), the guide member 6 resists the tensile force of the spring 8.
The tip rotates in the direction that lifts it up. During this time, manuscript 2a
The original 2 continues to be transported by the transport roller 91.
The tip of the guide member 6 is fed into the hollow portion formed by the curved tip of the guide member 6. Figure 1 (B
) indicates the status. Before this, the document 2a turns on the sensor S2 (n3). When the sensor S2 is turned on, the solenoid 7 is turned off (n4), and the guide member 6 is rotated by the tensile force of the spring 8, so that the tip portion 6b begins to lower. When the rotation of the guide member 6 is completed, the leading edge of the document 2a is inserted into the lowest part of the document bundle as shown in FIG. 1(C). Thereafter, the conveyance roller 92 rotates after a certain period of time tl, and the document 2a is perfectly stored at the bottom of the document bundle. Note that the time 't1 is the time during which the leading edge of the document is conveyed from the position 32 to the position of the conveyance roller 92 by the rotation of the conveyance roller 91.

In this embodiment, the solenoid 7 and the spring 8 correspond to the rotating means.

(g1 Effects of the Invention As described above, according to the present invention, jamming of returned originals can be prevented with a simple configuration that only includes a guide member of a simple shape and a rotating means for rotating this guide member. be able to.

Figure 1 (A)

[Brief explanation of drawings]

Figures 1 (A) to (C) are diagrams showing the operating state of the document return unit of the document circulation feeding device which is an embodiment of the present invention, and FIG. 2 is a diagram showing the processing procedure when returning the document by the same device. Flowchart, FIG. 3 is a diagram showing the overall configuration of the document circulation feeding device, and FIG. 4 is a diagram showing the configuration of the document return section of the conventional device. Figure 1 (B) C 1-Original tray, 2a-Return original, 6-Guide member, 6
a - curved part, 7 - solenoid, 8 tension spring. Figure (C) Figure 2 Figure

Claims (1)

[Claims] (1) In an original circulation feeding device that feeds the topmost original of a stack of originals set on a document tray and inserts the returned original into the bottom of the stack of originals, the front lower part of the original tray is , a guide member is provided which is rotated by a rotating means from a position where the leading end thereof pushes up the original on the original tray to a position where it does not touch the original; A document circulation feeding device characterized by being curved so as to face toward the leading edge of the document.