JPH08336004A - Sheet carrying device and original reader - Google Patents

Abstract

PURPOSE: To reduce the number of parts, to simplify constitution, to release an original carrying path by a simple operation in the constitution for which the degree of freedom in terms of design is increased and to facilitate maintenance of a read device. CONSTITUTION: A separation roller 1 and a separation piece 2 for separating and feeding an original 15 are provided and a sensor holder 5 for holding a contact image sensor 4 energized to a read roller 3 opposing the read roller 3 arranged on a downstream side from the separation roller 1 is arranged rotatably around a holder rotation center 6 arranged on an upstream side from the contact position of the read roller 3 and the contact image sensor 4. An upper original guide 8 for supporting the separation piece 2 and an operation part exterior 10 is arranged rotatably to a frame main body around an upper original guide rotation center 12 arranged on the downstream side from the rotary shaft of the read roller 3. A sensor release rib 14 provided on the original ejection side of the upper original guide 8 depresses the original ejection side end part 5a of the sensor holder 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device most suitable for a document conveying device provided in a document reading device such as a facsimile, and more specifically, it separates documents one by one and uses a contact type image sensor. The present invention relates to a document feeding device in a document reading device that reads image information of a document.

[0002]

2. Description of the Related Art Conventionally, a document reading apparatus of a type that reads image information using a contact image sensor has a shallow depth of field of the contact image sensor. A reading roller that is pressed against and that conveys the document is arranged to face the contact image sensor with respect to the document conveyance path, and the contact image sensor is pressed against the reading roller.

When the reading roller and the contact image sensor are separated from each other so as to release the original conveyance path by separating the reading roller from the contact image sensor, when the reading roller is moved and retracted with respect to the contact image sensor, the reading roller is a motor or the like. Since it is connected to the drive system, there is a problem that the retract structure becomes complicated.

For this reason, an original release lever that slides or rotates in a direction substantially the same as the direction in which the contact image sensor is urged to operate by the reading roller is fixedly provided to the contact image sensor to release the original. There is also a structure in which the contact type image sensor is separated from the reading roller by operating the lever, and the document conveying path is released.

Further, a separation roller for separating and feeding a plurality of originals one by one is provided on the upstream side of the original reading unit composed of a contact image sensor and a reading roller, and the separation roller is opposed to the original conveyance path. There is also a document feeding device provided with a separating piece which is provided at a position where the separating roller is urged by the separating roller.

In the above-described document feeding device, in order to release the document feeding path, the opening / closing frame that supports the separating piece is opened and closed, and the document releasing lever is operated to release the document feeding path. There is a problem that the operation becomes complicated.

In order to solve the above-mentioned problems, an original reading portion including a contact image sensor and a reading roller, and an original feeding path including an original separating portion including a separating roller and a separating piece are located upstream and downstream in the original conveying direction. A separation lever and a separation piece are separated from each other by a lever lever mechanism that is rotatable at both positions on the side, and a reading roller and a contact type image sensor are separated from each other to release the document conveyance path. There is.

However, the above-mentioned both lever link mechanism has a complicated structure, which causes a cost increase of the apparatus. Therefore, as shown in FIGS. 4 and 5, the present applicant separates the separating roller and the separating piece by a simple operation without using a complicated mechanism such as a double lever link mechanism, and at the same time, attaches them to the reading roller. This is a developed document feeder that can be separated from the image sensor. Note that FIG. 4 is a view when the operation unit exterior 31 and the upper document guide 28 are in a closed state, and FIG. 5 is a view when they are in an open state.

In FIG. 4, 21 is a separation roller, 22 is a separation piece, and the separation piece 22 is urged by a urging member (not shown) in the direction of pressing the separation roller 21. Reference numeral 23 is a reading roller, and 24 is a contact type image sensor. The contact type image sensor 24 is held by a sensor holder 25 and rotatable about a holder rotation center 26.

The contact type image sensor 24 and the sensor holder 25 are urged by the sensor urging member 27 in the direction of pressing the reading roller 23. Reference numeral 28 is an upper document guide, 29 is a lower document guide, 30 is a discharge guide, 31 is an operation unit exterior, and 32 is an ejection unit exterior. The operation unit exterior 31 and the separating piece 22 are supported by an upper manuscript guide 28 which is an opening / closing frame, and the upper manuscript guide 28 is located approximately in the middle of both rotary shafts of the separating roller 21 and the reading roller 23 in the manuscript conveying direction. It is configured to be rotatable with respect to the main body frame around the upper original guide rotation center 33 located.

The upper original guide 28 receives an urging force in the direction of arrow a in FIG. 4 about the upper original guide rotation center 33 by an urging member (not shown), and the upper original guide 28 is a stopper.
The upper original guide 28 and the separating piece 2
2. The operating part exterior 31 is positioned.

In FIG. 5, when the upper original guide 28 is rotated about the upper original guide rotation center 33 in the direction of the arrow b in FIG. 5 and opened, the operation portion exterior 31, the upper original guide 28 and the separating piece 22 are opened. The separation piece 22 is separated from the separation roller 21. Further, the sensor release rib 35, which is a part of the upper document guide 28, presses the sensor holder 25 holding the contact image sensor 24, so that the contact image sensor 24 and the sensor holder 25 are centered around the holder rotation center 26. By rotating in the direction of arrow d in FIG. 5, the contact image sensor 24 and the sensor holder 25 are separated from the reading roller 23. In the closed state shown in FIG. 4, the sensor release rib 35 is separated from the sensor holder 25.

As described above, since the original feeding path is released, the original 36 which is held by the separating roller 21 and the separating piece 22, and the reading roller 23 and the contact image sensor 24 is released from the holding, and the original 36 is released. It is possible to easily pull out in the discharge direction A or the document returning direction B. As described above, the separation roller 21 and the separation piece 22, and the reading roller 23 and the contact image sensor 24 can be separated from each other by a simple operation to release the document conveyance path.

[0014]

However, in the above-mentioned conventional example, since the upper document guide rotation center 33 is located near the middle of the document transport path, the discharge guide 30 is constructed integrally with the upper document guide 28. However, when the upper document guide 28 is configured to rotate integrally with the rotation operation of the upper document guide 28, the distance from the upper document guide rotation center 33 to the discharge side end 30a of the discharge guide 30 is relatively long. In addition, the discharge side end 30a of the discharge guide 30 largely moves downward in FIG. 5 due to the rotation operation when releasing the document conveying path, and the discharge side end 25a of the sensor holder 25 comes into contact with and interferes with the discharge side end 25a. There is.

In order to avoid this, in the above-mentioned conventional example, the discharge guide 30 and the upper original guide 28 are formed as separate members, and the discharge guide 30 is configured not to move even in the open state. There is a problem that the structure becomes complicated due to the increase of

Further, since the upper document guide rotation center 33 is arranged near the middle of the document transport path, the upper document guide rotation center 33
5 to the discharge side end 31a of the operation part exterior 31 is relatively long, and the discharge side end 31a of the operation part exterior 31 is largely moved downward in FIG. ,
There is a risk of interfering with the discharge part exterior 32 provided on the body frame.

For this reason, the discharge part exterior 32 must be formed in advance so as not to interfere with the operation part exterior 31,
There was a problem that the degree of freedom in design was restricted.

Further, the arrangement position of the holder rotation center 26 that pivotally supports the sensor holder 25 that holds the contact type image sensor 24 is downstream of the contact position of the sensor release rib 35 that presses the sensor holder 25 in the document conveying direction. Therefore, the end 25a of the sensor holder 25 on the document discharge side is open / closed as shown in FIG.
There is a problem in that there is almost no vertical movement in the above direction, and it is difficult to perform maintenance such as cleaning the reading surface of the contact image sensor 24 from the direction of the document discharge port.

Therefore, even if the contact type image sensor 24 is arranged near the document discharge port of the apparatus main body, the cleaning operation of the contact type image sensor 24 cannot be performed from the direction of the document discharge port. There was a problem that maintenance such as cleaning work had to be performed from the document insertion port arranged relatively far from 24.

The present invention is to solve the above problems,
The purpose is to reduce the number of parts and make the configuration simple, and in the configuration with increased design freedom, the document transport path can be released by a simple operation, and maintenance of the reading device can be performed. It is an object of the present invention to provide an easy sheet conveying device and a document reading device having the same.

[0021]

A typical constitution according to the present invention for achieving the above-mentioned object is to convey a sheet by the first means.
Rotating body and a first rotating body arranged to face the first rotating body.
A facing member, and a second rotating body which is provided on the downstream side of the first rotating body in the sheet conveying direction and which conveys a sheet,
A frame body supporting a second facing member arranged to face the second rotating body, the first and second rotating bodies, and the second facing member; An opening / closing frame that rotatably and rotatably supports the first facing member, and an axial center position that rotatably rotatably supports the opening / closing frame with respect to the frame body. The sheet transporting device is provided at a position corresponding to the axial center position of the second rotating body in the transport direction or on the downstream side of the axial center position of the second rotating body in the sheet transport direction.

When the opening / closing frame is closed with respect to the frame main body, the first facing member is urged against the first rotating body and the second facing member is provided. When the member is biased against the second rotating body and the open / close frame is opened to the frame body, the first rotating body and the first facing member are separated from each other. At the same time, the second rotating body and the second facing member are configured to be separated from each other.

Further, when the opening / closing frame is opened to the frame body, a part of the opening / closing frame presses the second facing member or a holder member holding the second facing member. It is characterized in that the second facing member is retracted in a direction away from the second rotating body.

The second facing member or a holder member for holding the second facing member is rotatably supported by the frame main body, and the second facing member or the holder member is supported. The rotation center position is provided on the upstream side in the sheet conveying direction with respect to the contact position where the second rotating body and the second facing member contact each other.

An original reading device according to the present invention includes the sheet conveying device, the sheet is a sheet-shaped original, and the second opposing member reads the image information of the sheet-shaped original. It is configured by means. Further, it is preferable that the original reading means is constituted by a contact image sensor.

[0026]

Since the sheet conveying apparatus according to the present invention is configured as described above, the rotational center position of the open / close frame corresponds to the axial center position of the second rotating body in the sheet conveying direction or the second rotational direction. By arranging on the downstream side in the sheet conveying direction from the axial center position of the body, the distance from the rotation center position of the opening / closing frame to the sheet discharge side end of the opening / closing frame can be shortened, and the opening / closing frame is closed. The sheet discharge side end of the opening / closing frame holds the second facing member or the second facing member by reducing the amount of movement of the sheet discharging side end of the opening / closing frame when rotating from the open state to the open state. It does not interfere with the holder member.
Further, the distance that the discharge-side end of the open / close frame approaches the frame body becomes smaller.

Further, the rotation center position of the second facing member or the holder member holding the second facing member is set to a sheet position more than the contact position where the second rotating body and the second facing member come into contact with each other. By arranging it on the upstream side in the transport direction, it is possible to easily perform maintenance on the second facing member from the sheet discharge port side.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a document reading device equipped with a sheet conveying device according to the present invention as a document conveying device will be concretely described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing a closed state of a document conveying device which is a sheet conveying device according to the present invention, and FIG. 2 shows an opened state where a document conveying path of the document conveying device which is a sheet conveying device according to the present invention is released. FIG. 3 is a cross-sectional explanatory view showing a manner of performing maintenance of the contact image sensor of the document conveying device which is the sheet conveying device according to the present invention.

In FIG. 1, reference numeral 1 is a separation roller which is a first rotating body for feeding a sheet-shaped original 15 made of paper, synthetic resin or the like, and 2 is opposed to the separation roller 1. It is a separation piece which is the first facing member provided as a separate piece. The separating piece 2 receives an urging force in a direction of pressing the separating roller 1 by an urging member (not shown). Documents 15 set with the document surface facing down from the document insertion port 17 are separated at the nip portion between the separation roller 1 and the separation piece 2 and fed one by one.

Reference numeral 3 is a reading roller which is a second rotating member, and 4 is a second roller provided to face the reading roller 3.
Is a contact-type image sensor that serves as a document reading unit that is a facing member. The contact image sensor 4 has a sensor holder 5
The sensor holder 5 is held by the holder rotation center 6
It is configured to be rotatable around. The holder rotation center 6 is the contact image sensor 4 in the document transport direction.
Is arranged on the upstream side in the document transport direction with respect to the abutting position where the abutting on the reading roller 3. The sensor holder 5 that holds the contact image sensor 4 is urged by the sensor urging member 7 in the direction in which the contact image sensor 4 presses the reading roller 3.

The reading roller 3 conveys the original document 15 separated and separated by the separating roller 1 and the separating piece 2 and fed while pressing the original document 15 against the contact image sensor 4, and the original image 15 is fed by the contact image sensor 4. Image information is read,
The signal is processed by an image processing unit or the like (not shown) and appropriately used for facsimile transmission or copying. The document 15 whose image information has been read by the contact image sensor 4 is conveyed by the reading roller 3 and discharged from the document discharge port 16 to the outside of the apparatus.

8 is an upper document guide, 9 is a lower document guide, 10
Is the exterior of the operation unit, and 11 is the exterior of the discharge unit. The separating piece 2 and the operation part exterior 10 are supported by an upper document guide 8 which is an opening / closing frame, and the upper document guide 8 is an upper document guide with respect to a frame body supporting the lower document guide 9, the discharge part exterior 11, and the like. It is configured to be rotatable around a rotation center 12.

The upper document guide rotation center 12 is arranged downstream of the rotational axis position of the reading roller 3 in the document transport direction in the document transport direction. The upper original guide 8 receives an urging force in the direction of arrow a in FIG. 1 about an upper original guide rotation center 12 by an urging means (not shown), and the upper original guide 8 is brought into contact with a stopper 13 provided on the frame main body side to move the upper original guide 8 upward. The document guide 8, the separating piece 2, and the operating portion exterior 10 are positioned.

In FIG. 2, the upper document guide 8 shown in FIG. 1 is rotated around the upper document guide rotation center 12 in the direction of arrow b in FIG. I will show the situation when I did. At this time, the separation piece 2 provided on the opening / closing frame side is separated from the separation roller 1.

At this time, the sensor release rib 14 which is a part of the upper document guide 8 and which is provided at a position corresponding to the document discharge side end 5a of the sensor holder 5 has the sensor release rib 14 on the document discharge side. By pressing the end 5a, the contact image sensor 4 and the sensor holder 5 rotate about the holder rotation center 6 in the direction of arrow c in FIG. Separate from 3. In the closed state shown in FIG. 1, the sensor release rib 14 is separated from the sensor holder 5, and the reading operation can be performed without any trouble.

Therefore, the document 15 which is sandwiched by the separation roller 1 and the separation piece 2, and the reading roller 3 and the contact image sensor 4 can be easily pulled out in the document discharge direction A or the document return direction B. .

With the above-mentioned structure, the separation roller 1 and the separation piece 2, the reading roller 3 and the contact image sensor 4 are separated by a simple operation to release the document conveyance path, and the inside of the document conveyance path is released. The original 15 can be easily taken out.

Here, as described above, the center of rotation 12 of the upper original guide is disposed on the downstream side of the reading roller 3 in the original conveying direction, and the sensor release rib 14 which is a part of the upper original guide 8 is the upper original. The guide 8 is arranged near the document discharge side end. The holder rotation center 6 of the sensor holder 5 that holds the contact image sensor 4 is arranged upstream of the contact position between the reading roller 3 and the contact image sensor 4 in the document conveying direction, and the upper document guide 8 is The sensor release rib 14 arranged near the document discharge side end is arranged at a position to press the document discharge side end 5a of the sensor holder 5.

For this reason, since the end of the upper document guide 8 on the document discharge side is relatively close to the position of the upper document guide rotation center 12, even when the document transport path shown in FIG. 2, the amount of movement of the end of the upper document guide 8 on the document discharge side in the vertical direction in FIG. 2 is relatively small, and the end of the upper document guide 8 on the document discharge side is excluded except for the sensor release rib 14. It does not interfere with the contact image sensor 4 and the sensor holder 5.

Further, the position of the upper document guide rotation center 12 is
It is arranged on the downstream side of the reading roller 3 in the document conveying direction, and the distance between the upper document guide rotation center 12 and the document discharge side end 10a of the operation portion exterior 10 is relatively small. Therefore, even in the open state shown in FIG. 2, the amount of movement of the document discharge side end portion 10a of the operation portion exterior 10 in the vertical direction in FIG. Therefore, the end portion 10a of the manipulating portion exterior 10 of the manipulating portion exterior is the exterior portion of the ejecting portion provided on the frame body.
Since it does not interfere with 11, the flexibility of the design of the shape of the discharge part exterior 11 is increased, which is preferable.

Further, the position of the holder rotation center 6 of the sensor holder 5 for holding the contact image sensor 4 is arranged upstream of the contact position between the reading roller 3 and the contact image sensor 4 in the document conveying direction. Therefore, during maintenance such as cleaning of the contact image sensor 4, as shown in FIG. 3, the contact image sensor 4 and the sensor holder 5 are pushed down from the document discharge port 16 to clean the contact image sensor 4. It becomes possible to easily perform maintenance such as.

In the above embodiment, the upper document guide rotation center 12
Is placed at a position different from the rotation axis of the reading roller 3,
The rotation center of the open / close frame may be provided coaxially with the rotation axis of the reading roller 3 or at the same position in the document transport direction.

Further, in the above-mentioned embodiment, the contact type image sensor 4 which is the document reading means is arranged as the second facing member, but as the second facing member, recording for recording an image on a recording sheet is carried out. It is also possible to apply to a recording device in which the means is arranged.

[0044]

Since the sheet conveying apparatus and the document reading apparatus according to the present invention have the above-described structure and operation, the conveying path can be released by a simple operation with a small number of parts. Further, in the open state in which the conveyance path is released, the amount of movement of the opening / closing frame on the sheet discharge side where the opening / closing frame and the frame body approach each other can be reduced, so that the degree of freedom in designing the exterior shape increases.

Further, maintenance such as cleaning of the reading surface of the contact type image sensor can be easily performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a closed state of a document conveying device which is a sheet conveying device according to the present invention.

FIG. 2 is an explanatory cross-sectional view showing an opened state in which a document transport path of a document transport device which is a sheet transport device according to the present invention is released.

FIG. 3 is a cross-sectional explanatory view showing a manner of performing maintenance of a contact image sensor of a document conveying device which is a sheet conveying device according to the present invention.

FIG. 4 is a diagram illustrating a conventional example.

FIG. 5 is a diagram illustrating a conventional example.

[Explanation of reference numerals] 1 ... Separation roller, 2 ... Separation piece, 3 ... Read roller, 4 ... Contact image sensor, 5 ... Sensor holder, 5a ... Original discharge side end, 6 ... Holder rotation center, 7 ... With sensor Member,
8 ... upper document guide, 9 ... lower document guide, 10 ... operation part exterior, 10a ... document ejection side end, 11 ... ejection part exterior, 12 ... upper document guide rotation center, 13 ... stopper, 14 ... sensor release rib, 15 ... Original, 16 ... Original exit, 17 ... Original insert, A ...
Original discharge direction, B ... Original return direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Terashima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Toshihisa Kawashima 3-30-2 Shimomaruko, Ota-ku, Tokyo Kyano Within the corporation

Claims (6)

[Claims] 1. A first rotating body which conveys a sheet, a first facing member which is arranged so as to face the first rotating body, and which is provided on the downstream side of the first rotating body in the sheet conveying direction. And a second rotating member that conveys a sheet, a second facing member that is arranged to face the second rotating member, the first and second rotating members, and the second facing member. A frame body that supports the frame body,
An opening / closing frame that supports the first facing member, and an axis center position that rotatably supports the opening / closing frame with respect to the frame body is an axis of the second rotating body in the sheet conveying direction. A sheet conveying device provided at a position corresponding to a center position or on a downstream side in a sheet conveying direction with respect to an axial center position of the second rotating body. 2. When the opening / closing frame is closed with respect to the frame body, the first facing member is urged against the first rotating body and the second facing member is pressed. When the member is biased against the second rotating body and the open / close frame is opened to the frame body, the first rotating body and the first facing member are separated from each other. At the same time, the second rotating body and the second facing member are configured to be separated from each other.
3. The sheet conveying device according to 1. 3. When the opening / closing frame is opened to the frame body, a part of the opening / closing frame presses the second facing member or a holder member holding the second facing member. The second opposing member is the second
The sheet conveying device according to claim 2, wherein the sheet conveying device is configured to be retracted in a direction away from the rotating body. 4. The second facing member or a holder member for holding the second facing member is rotatably supported by the frame main body, and the second facing member or the holder member holds the second facing member. The sheet conveying device according to claim 1, wherein the rotation center position is provided on the upstream side in the sheet conveying direction with respect to the contact position where the second rotating body and the second opposing member contact each other. 5. The sheet conveying device according to claim 1, wherein the sheet is a sheet-shaped original document, and the second opposing member displays image information of the sheet-shaped original document. An original reading device comprising an original reading unit for reading. 6. The document reading apparatus according to claim 5, wherein the document reading unit is a contact image sensor.