JPH04308866A - Automatic document feeder - Google Patents

Abstract

PURPOSE:To easily take out a document without damaging it by opening a opening/closing body when a document in a sheet feeding part is jammed in the automatic document feeder of a copying machine. CONSTITUTION:A first holding part is formed by a roller 11 and a belt 9 and a second holding part is formed by rollers 25 and 24. The opening/closing body 16 for which a movable guiding plate 23 is firmly fixed is supported by a rotary shaft 17 so that it can be freely opened/closed. A cam which turns along with the opening/closing of the opening/closing body 16 is firmly fixed to a rotary shaft. When a document 2 is jammed in a sheet feeding part, the opening/closing body 16 is opened to release the document holding of a second holding part, and also the movable guide plate 23 is opened to release the document holding of a first holding part by means of the rotation of the cam. Therefore, the document can be taken out without applying the force to the document and damaging it.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder for a copying machine that facilitates the removal of jammed documents.

0002

2. Description of the Related Art In general, automatic document feeders of copying machines that automatically feed multiple sheets of originals one by one to the document reading section have a wide range of document quality and sizes, and the documents may be warped or folded. Because of this, the document may become jammed inside the paper feed section of the automatic document feeder. Paper jams that occur inside a copying machine are copy paper, so there is no problem if the paper gets torn or dirty when removed, but paper jams that occur in the automatic document feeder are valuable documents. , there is the difficulty of having to remove the original without damaging it.

[0003] For this reason, conventionally, a part of the passage in the paper feed section is constructed with an opening/closing body, and when a paper feed jam occurs, opening and closing the opening/closing body exposes the passage in the paper feed section and makes it easier to take out the original. .

0004

[Problems to be Solved by the Invention] In such a conventional configuration, even when the opening/closing body is opened, the document feeding means constituting the paper feeding section and the document handling device that clamps and feeds the document between the first connecting portions are not provided. If the document is jammed in the device, the document is held in the second holding section, or in each device of the document sending device that holds the document in the second holding section, or in any of the means, the jammed document may be very thin. If the paper is bent or is moving slowly, excessive force is applied to the document when removing it, making it extremely difficult to remove it without damaging it. There was a problem.

The present invention solves the above-mentioned problem, and by opening the opening/closing body, it is possible to release the document from each means constituting the paper feed section and easily take out the jammed document without damaging it. The purpose is to provide an automatic document feeder.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a document feeding means for feeding out a large number of documents one by one, and a document feeding means for feeding out a large number of documents one by one, and a first document holding portion that holds the document. a paper feeding unit comprising a document handling device that feeds the document to a passage; a document sending device that clamps the document with a second clamping portion and sends the document from the document path to a conveyor belt; and a movable guide plate that forms the document path. and a cam interlocked with the opening/closing of the opening/closing body, and when the opening/closing body is opened, the first holding part of the document handling means and the second holding part of the document sending means are opened. It is configured to release the clamping.

[0007]

[Operation] With the above-described structure, the cam that is linked to the opening of the opening/closing body releases the document clamping of the first clamping section of the document handling means and the second clamping section of the document sending means.
By opening the opening/closing body, the document can be taken out without applying excessive force.

In addition, when the opening/closing member is opened, the movable guide plate is separated from the fixed guide plate and the document path is left open, making it possible to easily take out the document.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, a large number of original documents 2 are stacked on a paper feed tray 1 with the lower side in the figure facing the image surface. Manuscript 2
When the document 2 is inserted until it touches the tip of the document stopper claw 3, the document presence/absence sensor lever 4 is pushed upward by the document 2, and the document presence/absence sensor 5 detects the insertion of the document. The movable paper feed plate 6 is pulled upward by a solenoid (not shown), but when a document is inserted, the solenoid is released, and the springs 7 at both ends force the document 2 downward about the fulcrum shaft 8, and the document 2 is sent to the belt. Press 9. The sorting guide 10 guides the sent document to the sorting rollers 11.

[0011] The above-mentioned members constitute a document feeding means, which feeds a large number of documents 2 one by one to the document handling means.

In the document handling means, as shown in FIG. 2, a handling roller 11 is fixed to a supporting member 13 which is vertically slidable using a pin 12 as a guide shaft, and the supporting member 13 is pushed downward by a spring 14. energized. As a result, the sorting roller 11 fixed to the support member 13 is moved to the feed belt 9.
The first holding part is formed by being pressed against the first holding part. Then, by the rotation of the sorting roller 11 and the forwarding action of the feed belt 9, the documents are reliably separated one by one and sent to the document path.

The opening/closing body 16 is rotatably supported by a rotating shaft 17 whose both ends are supported by bearings 18, and a cam 15 is fixed to the rotating shaft 17. Therefore, cam 15
rotates as the opening/closing body 16 opens and closes.

As shown in FIG. 3, the opening/closing body 16 maintains the closed state by attracting the magnet 19 attached to the upper part to the paper feed stay 20 (see FIG. 1) attached to the main body. By applying force in a direction to separate the magnet 19 from the paper feed stay 20, the magnet 19 is brought into an open state. The open/close state of the opening/closing body 16 is detected by the coupling between the sensor rib 21 provided on the upper part of the opening/closing body 16 and the opening/closing sensor 22 attached to the paper feed stay 20.

When the opening/closing body 16 is closed, as shown in FIG.
As shown in FIG. 2, the cam 15 and the support member 13 are in a non-contact state, and the sorting roller 11 is pressed against the feed belt 9 by the spring 14. When the opening/closing body 16 is opened, the cam 15
When the opening/closing body 16 is completely opened as shown in FIG. 4, the sorting roller 11 is separated from the feed belt 9 and the first
The grip of the gripping part is released.

A document path through which documents are sent out from the document handling means is formed by a movable guide plate 23 attached to the opening/closing body 16 and a fixed guide plate 24 attached to the main body side. As a result, as shown in FIG. 4, the opening/closing body 16
When the movable guide plate 23 is opened, the movable guide plate 23 is separated from the fixed guide plate 24, and the document path is left open.

A pair of rollers 25 and 2 are located in the middle of the document path.
A second clamping portion formed by 6 is disposed. The roller 25 is attached to the opening/closing body 16, and a part thereof faces the inner surface of the movable guide plate 23, and when the opening/closing body 16 is closed, it is attached to the main body side by a leaf spring 27 and a part thereof is fixed. It is pressed against a roller 26 facing the inner surface of the guide plate 24. Then, the original is sent to the conveyor belt 30 by the rotation of the roller 26. A document passage sensor lever 28 is provided upstream of the roller 26, and a document passage sensor 29 detects the movement of the document.

The conveyor belt 30 is an endless belt having a width that covers the entire surface of the document, and its surface is coated with a material having a sufficient coefficient of friction so that the document can be conveyed by frictional force. The conveyance belt 30 is rotated by a conveyance drive roller 31 and conveys the document sent out by rollers 25 and 26.

In the above configuration, when the document presence sensor 5 and the document passage sensor 29 detect that the document 2 has not moved within the paper feed section within a predetermined period of time, the automatic document feeder assumes that a paper jam has occurred and starts operating. Stop and display paper jam indication.

When a paper jam occurs, when the opening/closing body 16 is opened, the movable guide plate 23 and roller 25 are moved to the opening/closing body 16.
Since the document path is left open and the roller 2
5 and roller 26 are separated. As a result, the gripping of the document by the second gripping section is released.

Further, when the opening/closing sensor 22 detects that the opening/closing body 16 is opened, a solenoid is electrically operated to pull up the movable paper feed plate 6 and separate it from the feed belt 9.

Furthermore, by opening the opening/closing body 16, the cam 1
5 pushes up the support member 13 to separate the sorting roller 11 from the feed belt 9. As a result, the document is released from being held by the first holding section.

As described above, according to the automatic document feeder according to the embodiment of the present invention, the document path is opened by simply opening the opening/closing member 16, and the document is released from being held by the first and second holding portions. This has the effect of allowing jammed originals to be taken out without damaging them. Note that if a rotating roller or the like is used in place of the movable paper feed plate 6 of the document feeding means, it is not necessarily necessary to separate this roller from the surface of the document.

[0024]

As is clear from the description of the embodiments above, according to the present invention, the cam interlocked with the opening of the opening/closing body is connected to the first holding part of the document handling means and the second holding part of the document feeding means.
Since the gripping portion of the original document is released, the document can be taken out without applying excessive force by opening the opening/closing body.

In addition, when the opening/closing body is opened, the movable guide plate is separated from the fixed guide plate, and the document path is left open, so that the document can be easily taken out.

In this way, it is possible to provide an automatic document feeder that can easily take out a jammed document without damaging it.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the configuration of an embodiment of an automatic document feeder of the present invention.

[Fig. 2] Side sectional view showing the configuration of the document handling means

[Figure 3
] Side sectional view showing the structure of the opening/closing body

[Figure 4] Side sectional view showing the configuration of the opening/closing body in the open state

[Explanation of symbols]

2 Document 9 Feed belt (first clamping section) 11 Sorting roller (first clamping section) 15 Cam 16 Opening/closing body 23 Movable guide plate (document path) 24 Fixed guide plate (document path) 25 Roller (second clamping section) part) 26 Roller (second clamping part) 30 Conveyor belt

Claims (2)

[Claims] Claims: 1. Document feeding means for feeding out a large number of documents one by one; document handling means for holding the document in a first gripping section and sending it out to a document path; a paper feeding unit comprising a document feeding unit that clamps the document with a clamping unit and sends the document from the document path to the conveyor belt; an opening/closing body provided with a movable guide plate forming the document path; and an opening/closing body interlocked with opening/closing of the opening/closing body. an automatic document feeder, the automatic document feeder having a cam that releases the first holding part of the document handling means and the second holding part of the document sending means by opening the opening/closing body. 2. The automatic document feeder according to claim 1, wherein the movable guide plate is further separated from the fixed guide plate by opening the opening/closing member.