JP2002265090A - Automatic document feeder - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an automatic document feeder capable of removing jammed paper from a transport path with a simple operation and removing jammed paper with a simple and inexpensive configuration. To provide. SOLUTION: After a main body cover 23 is opened to release the pressurization of the paper feed belt 11, a holding member 22 is moved to a release position, and a holding member 22 is pressed by a holding member 22.
The support member 26 is moved in the direction opposite to the pressing direction against the urging force of the coil spring 27.

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 provided in a copying machine, a facsimile machine, a scanner, a multifunction machine, and the like. The present invention relates to an automatic document feeder that can automatically feed a document.

[0002]

2. Description of the Related Art Conventionally, in an automatic document feeder (hereinafter, simply referred to as an ADF) provided in a copying machine, a facsimile machine, a scanner, a multifunction machine, etc., originals are separated one by one from a bundle of originals. A separation unit for conveying the document to the reading position is provided. For example, the separation unit includes a paper feed belt that moves around in the direction of feeding a document and a direction that slides on the paper feed belt and prevents the document from being fed. There is known a device comprising a separating roller which rotates at a constant speed.

In order to reliably separate the original, it is necessary to press one of the paper feed belt and the separation roller against the other of the paper feed belt and the separation roller. For example, a cover for removing jammed paper generated in the transport path is attached to the main body of the ADF, and when the cover is closed, the cover feeds the feed belt to the separation roller.

On the other hand, if a document jam occurs in the transport path, it is necessary to release the pressing force of the sheet feeding belt by opening the cover.

At this time, simply releasing the pressurization of the paper feed belt does not create a gap for removing jammed paper in the transport path between the paper feed belt and the separation roller. Means are provided, and a sheet feeding belt unit holding the sheet feeding belt is also provided with an adsorption means such as a magnet,
By attracting the magnets together with the opening operation of the cover, the paper feeding belt is attracted to the cover, and a gap for removing the jammed paper is secured in the transport path between the paper feeding belt and the separation roller. (See JP-A-9-218543 for such a conventional example.)

[0006]

However, such a conventional ADF has a structure in which a gap is provided between the paper feed belt and the separation roller when jammed paper is removed. Actually, a pair of transport rollers for transporting the document separated by the separating unit to a reading position such as a contact glass is provided on the transport path with the transport path interposed therebetween. Therefore, it is necessary to separate the transport roller pairs. However, since the transport roller pair is not mentioned at all, it is conceivable that a large addition is added to the document by the transport roller pair when the jammed paper is removed, thereby damaging the document.

Further, in order to secure a gap in the transport path by separating the pair of transport rollers, an independent structure for separating the pair of transport rollers is required. However, there is a problem that the manufacturing cost increases.

Accordingly, an object of the present invention is to provide an automatic document feeder capable of removing jammed paper from a transport path with a simple operation and removing the jammed paper with a simple and inexpensive configuration. And

[0009]

According to a first aspect of the present invention, in order to solve the above-mentioned problems, a separating means for separating documents one by one from a document bundle placed on a document placing table and a separating means for separating the documents one by one. Transporting means for transporting the original to the reading position, wherein the separating means faces a calling member for feeding the original placed on the original placing table via a transport path of the original, and A paper feed belt that moves in the paper feed direction, a blocking member that slides in contact with the paper feed belt and moves in a direction that blocks the feeding of the original, and a holding member that holds the call-out member. And a holding member movable between a release position for releasing the pressure and a release position for releasing the pressure. The transport unit faces the transport path of the document and transports the document to each other. Pair moving in the direction In the automatic document feeder comprising a conveying member, the separating unit and the conveying means are provided on the main body of the automatic document feeder so as to be openable and closable so as to be exposed and closed to the outside. And a main body cover that presses the paper feed belt toward the blocking member, a support member that supports one of the pair of conveying members, and presses one of the conveying members against the other of the conveying members. A biasing member for biasing the support member, wherein the holding member presses the support member when the main body cover is moved to the open position and the holding member is moved to the release position. Accordingly, the support member is moved in a direction opposite to the pressing direction against the urging force of the urging member.

In this case, after the main body cover is opened to release the pressurization of the paper feed belt, the holding member is moved to the release position and the supporting member is pressed by the holding member, so that the supporting member is pressed by the urging member. It can be moved in the direction opposite to the pressing direction against the urging force, and the gap between the transport paths can be secured by separating the pair of transport members.

As described above, by moving the holding member to the separated position, it is possible to simultaneously release the pressurization of the separation means and the release of the pressurization of the transporting means. Therefore, the jammed paper is removed by a simple operation. be able to.

Further, the jammed paper can be removed with a simple and inexpensive configuration in which a supporting member is added to an existing holding member for holding the calling member.

According to a second aspect of the present invention, there is provided a connecting member for connecting the main body cover and the holding member, and the holding member is released via the connecting member when the main body cover is opened. It is characterized in that it is moved to a position.

In this case, since the pressurizing of the separating means and the conveying means can be released with the opening operation of the main body cover, the jammed paper can be removed by a simpler operation.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the automatic document feeder according to the present invention.

First, the configuration will be described. FIG. 1 shows a main body 1 of an image forming apparatus such as a copying machine, a facsimile machine, a scanner, and a multifunction machine. A contact glass 2a and a slit glass 2b having a smaller area than the contact glass 2a are provided on the upper surface of the main body. I have.

An ADF 3 is provided on an upper portion of the main body 1, and the ADF 3 can be opened and closed so as to open and close the contact glass 2a via a hinge mechanism (indicated by reference numeral 31 in FIG. 4B). It has become.

The ADF 3 includes a document tray (document mounting table) 4, a separating means 5, a conveying means 6, a paper discharging means 7, and a paper discharging tray 8.

The original tray 4 is configured to place an original bundle P composed of a plurality of originals, and the original bundle P is separated into one sheet by a separating means 5.

The separating means 5 comprises an abutment plate 9, a call roller (call member) 10, a paper feed belt 11, and a separation roller (blocking member) 12.

The abutment plate 9 abuts against the leading edge of the document bundle P to align the leading ends of the document bundle P,
Original bundle P is controlled so as to prevent from entering the separating means 5 side, and moves between a position where the distal end position and away abuts on the original bundle P by abutting a solenoid (not shown) .

The call roller 10 is provided so as to be movable between a position where it comes into contact with the upper surface of the document bundle P and a position where it is separated by a call solenoid (not shown), and the call solenoid is driven by a paper feed start signal from the main body 1. Then, the document is moved from the separation position to the contact position depending on the degree of the call, and the document located above the document bundle P is fed. At this time, the butting solenoid is also driven, and the butting plate 9 is separated from the leading end of the document bundle P.

The paper feed belt 11 is wound around a drive roller 11a and a driven roller 11b, and rotates clockwise as the drive roller 11a is driven clockwise by a paper feed motor (not shown) when the document is separated. It has become. The separation roller 12 is in sliding contact with the paper feed belt 11, and is rotated clockwise by a paper feed motor. As a result, only the uppermost document is separated from the document bundle P.

The conveying means 6 is composed of a driving roller 13 and a driven roller 14 slidably contacting the driving roller 13. The conveying means 6 holds the document separated by the separating means 5 and places the document on the slit glass (reading position) 2b. It is designed to be transported.

A reading optical system (not shown) such as a light source, a reflecting mirror, a condenser lens, and a CCD is stopped in the main body 1 below the slit glass 2b.
Is read by the reading optical system.

In order to place the original on the contact glass 2a and read the original, the original surface is read by moving the reading optical system in the horizontal direction in FIG. 1 below the contact glass 2a. ing.

The paper discharging means 7 comprises a first paper discharging roller pair 15 and a second paper discharging roller pair 16, and the document which has passed through the slit glass 2b is pinched by the first and second paper discharging roller pairs 15, 16. The paper is then discharged onto the paper discharge tray 8.

On the other hand, as shown in FIGS.
Is attached to a belt holder 21. This belt holder 21 has one end attached to the roller shaft of the drive roller 11a and has a notch 21a.
The driven shaft of the driven roller 11b is inserted. Also,
A coil spring (not shown) is provided in the notch 21a, and the driven roller 11b is pressed by the coil spring in a direction away from the drive roller 11a, thereby applying tension to the paper feed belt 11. .

One end of a holding member 22 is swingably attached to the roller shaft of the drive roller 11, and the call roller 10 is rotatably attached to the other end of the holding member 22. . The holding member 22 has a paper feed belt 11
A pressing position (the position shown in FIG. 2) that presses the paper feed belt 11a against the separation roller 12 so as to cover the paper feed belt 11 and a release position that is separated upward from the paper feed belt 11 so as to release the pressurization of the paper feed belt 11 ( (Position in FIG. 3).

In the present embodiment, the call rollers 10,
The paper feed belt 11, the separation roller 12, the belt holder 21, and the holding member 22 constitute a separation unit.

The body 3a of the ADF 3 has a body cover.
The main body cover 23 is rotatably provided on a rotation shaft 25, and opens and closes the main body 3a so as to expose and close the separation unit and the conveying means 6.

The main body cover 23 is provided with a projection 23a. When the main body cover 23 closes the main body 3a,
When the protrusion 23a presses the belt holder 21, the feed belt 11 is pressed against the separation roller 12, and the feed belt 11 is pressed.
A separation pressure is generated in the separation roller 11 and the separation roller 12.

The body cover 23 and the holding member 22 are connected by a band member (connecting member) 24, and the band member 24 is attached to the body cover 23 and the holding member 22 by retaining rings 24a and 24b, respectively. .

The band member 24 is composed of the main body cover 23 and the main body 3.
a is closed so as not to interfere with the surrounding members when closed, and is stored in the main body 3a.
When the is released, the holding member 22 is rotated to the release position.

A supporting member 26 is rotatably provided on the rotating shaft 25, and the driven roller 14 is rotatably provided on the supporting member 26. In addition, FIG.
A coil spring (biasing member) 27 as shown in FIG. 2B is wound, and the end of the coil spring 27 presses the supporting member 26 to press the driven roller 14 against the driving roller 13. ing.

On the other hand, the end of the support member 26 extends to the vicinity of the holding member 22, and when the holding member 22 moves to the release position, the holding member 22 presses the support member 26, thereby supporting the support member 26. The member 26 is moved in the direction opposite to the pressing direction of the driven roller 14 against the urging force of the coil spring 27.

Next, the operation will be described.

In the present embodiment, a document transport path is formed between the paper feed belt 11 and the separation roller 12 and between the drive roller 13 and the driven roller 14. When the main body cover 23 is closed, the belt holder is
When the paper feed belt 11 presses the separation roller 12 to generate a separation pressure, the coil spring 27
The conveying pressure is generated by pressing the driven roller 14 against the driving roller 13 by pressing.

Here, if a jam occurs in the document conveyance path, the display unit (not shown) indicates that the jam has occurred, and the user opens the main body cover 23 as shown in FIG. 4A. At this time, the pressing of the belt holder 21 is released by the cover 23, and the hand member 24 folded and stored in the main body 3a is expanded, and the holding member 22 is pulled by the band member 24 so that the holding member 22 is pulled.
Swings to the release position.

At this time, when the holding member 22 presses the support member 26, the support member 26 moves in the direction opposite to the pressing direction of the driven roller 14 against the urging force of the coil spring 27.
As a result, the pressurization of the paper feed belt 11 and the separation roller 12 and the pressurization of the drive roller 13 and the driven roller 14 are simultaneously released.

Next, as shown in FIG.
3 is moved to the open position via the hinge mechanism 31, and then the white plate 32 covering the contact glass 2a is removed to expose the driven roller 14 below the ADF 3 as shown in FIG. Remove jammed paper from the transport path.

As described above, in this embodiment, the main body cover 23
To release the pressurization of the paper feed belt 11, and then
22 is moved to the release position, and the holding member 22
By pressing the support member 26, the support member 26 can be moved in the direction opposite to the pressing direction against the urging force of the coil spring 27. Can be simultaneously performed, and the jammed paper can be removed by a simple operation.

Further, the jammed paper can be removed with a simple and inexpensive configuration in which a support member 26 is added to the existing belt holder 21 holding the call roller 10.

Further, since the main body cover 23 and the holding member 22 are connected by the band member 24, the holding member 22 can be moved to the release position via the band member 23 when the main body cover 23 is opened. For this reason, the pressurization of the separating means 5 and the conveying means 6 can be released with the opening operation of the main body cover 23, and the jammed paper can be removed by a simpler operation.

[0046]

According to the present invention, by moving so as to move the holding member to the separation position, it is possible to release the pressure of the pressure release and transport means of the separating means at the same time, easy The jam paper can be removed by a simple operation. Also, simple addition of the support member to an existing holding member for holding the call members, and can be removed jammed sheet inexpensive configuration.

Further, a connecting member for connecting the main body cover and the holding member is provided, and when the main body cover is opened, the holding member is moved to the release position via the connecting member. The pressurization of the means and the conveying means can be released, and the jammed paper can be removed by a simpler operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an automatic document feeder according to the present invention, and is a schematic configuration diagram thereof.

FIG. 2 is a schematic view of a separating unit and a transporting unit when the main body cover of one embodiment is closed.

FIG. 3A is a schematic view of a separating unit and a conveying unit when a main body cover according to an embodiment is opened, and FIG. 3B is a configuration diagram of a coil spring that presses a support member.

FIG. 4 is a diagram illustrating a procedure for removing jammed paper according to one embodiment.

[Explanation of symbols]

 3 Automatic Document Feeder 4 Document Tray (Document Placement Table) 5 Separation Means 6 Transport Means 10 Calling Roller (Calling Member, Separation Unit) 11 Feeding Belt (Separation Unit) 12 Separation Roller (Separation Unit) 13 Drive Roller 14 Follower Roller 21 Belt holder (separation unit) 22 Holding member (separation unit) 24 Band member (connection member) 26 Support member 27 Coil spring (biasing member)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (Reference) 2H076 AA58 BA17 BA24 BA48 BA49 BA52 3F049 CA01 CA33 DA12 DB02 DB04 LA02 LB02 3F343 FA03 FB02 FB03 FC01 FC05 GA01 GB01 GC01 GD01 HA07 HA12 JA35 JD04 JD10 JD33 KB04 KB05 KB06 LA04 LA15 LA LC11 LC12 LD10 5C062 AA05 AB17 AB29 AD02 AD06 BA00

Claims (2)

[Claims] A separating unit for separating the originals one by one from a bundle of originals placed on an original placing table; and a conveying unit for transporting the originals separated by the separating unit toward a reading position. Means for feeding a document placed on the document table, a feeding belt facing the document path, and moving in the document feeding direction; A blocking member that moves in the direction of contacting and blocking the feeding of the original document, and a pressing position that holds the calling member and presses the paper feed belt against the blocking member and moves between a release position that releases the pressing. An automatic document feeder comprising: a pair of transporting members, each of which includes a pair of transporting members that face each other across a transporting path of the document and that move in the direction of transporting the document. You The automatic document feeder is provided to be openable and closable on the main body of the automatic document feeder so as to expose and close the sheet and the feeding means to the outside, and when closing, the holding member is moved to the pressing position and the paper feed belt is blocked. A body cover that presses toward the member, a support member that supports one of the pair of transport members, and a biasing member that biases the support member so as to press one of the transport members against the other of the transport members. When the main body cover is moved to an open position and the holding member is moved to a release position, the support member is pressed by the holding member, whereby the urging member presses the support member. An automatic document feeder that moves in a direction opposite to the pressing direction against the urging force of the document. 2. A connecting member for connecting the main body cover and the holding member, wherein the holding member is moved to a release position via the connecting member when the main body cover is opened. The automatic document feeder according to claim 1.