JPH11100141A - Paper sheet carrying device, and image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the inconvenience of duplicate feed, etc. by projecting an operating means outside a device body when a friction means is separated from a sheet carrying means to release the friction, to allow a user to easily recognize the friction release condition. SOLUTION: When an inclined part 30a of a release lever 30 is in a position not abutted on a projection 46d provided on an ADF holder 46, a separation piece is pressed against a separation roller by the pressure of an ADF spring. When an operation knob 30c is operated to turn the release lever 30 around a shaft 25a, the inclined part 30a of the release lever 30 is slidably abutted on the projection 46d of the ADF holder 46, and the ADF holder 46 is turned around the projected shaft 46a against the pressure of the ADF spring. Then, a flat part 30b of the release lever 30 comes below the projection 46d and the separation piece releases the friction to hold the separation piece in a separated condition from the separation roller. The operation knob 30c is located at a center part on a document insertion port 42 side in a condition projected from an end part 25b of an upper guide 25 of the document.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus provided in an image reading apparatus such as a facsimile apparatus for automatically separating and conveying a plurality of sheet documents.

[0002]

2. Description of the Related Art A document image reading section of a facsimile apparatus or the like is an automatic document that automatically separates and transports documents one by one when a plurality of sheet-like documents are set on a document table and transmitted. It has a separation transport mechanism.

As the document separation and transport mechanism, a mechanism having a mechanism in which a separation piece is brought into contact with a separation roller and the separation piece is pressed by an elastic body such as a spring is widely used. The sheet is in contact with the separation roller of a plurality of sheets by utilizing the difference in the frictional force between the sheets, the frictional force between the sheet and the separation piece, and the frictional force between the sheet and the separation roller by rotating in the conveying direction of the sheet. Separates and transports only one sheet.

In the case of a multi-function facsimile apparatus having a function of performing color copying in addition to a function of facsimile transmission and reception or a function of being connected to a computer and taking a color image into the computer, it is used at the time of facsimile transmission. There is a case where a sheet of a type different from the sheet to be used is used as a document.

For example, newspaper cutouts, color pages of magazines, color photographs, business cards, and the like are used as different types of sheets. Newspaper and magazine cutouts are thin and weak paper types. There is. When transporting these various sheets, it is required that the front and back surfaces are not stained without damaging the document rather than the separation performance.

[0006] A rubber material having a high coefficient of friction is used for a separation piece of a sheet conveying section of a conventional facsimile machine.
Even if the pressing force of the separation piece is reduced, the friction coefficient of the separation piece is high, so that when each sheet is used as a document, the document may be scratched or damaged. In addition, there is a possibility that the rubber material (rubber residue) of the separation piece adheres to the back surface of the separation piece due to the rubbing between the original and the rubber material used for the separation piece, thereby causing contamination. Further, when thick and hard paper such as a business card is used as a document, it is difficult to convey the sheet only by reducing the pressing force of the separation piece.

From the above, in order to transport thick paper such as business cards, originals such as photographs, newspapers or magazines without leaving traces of rubber on the back surface, the separation piece is completely separated from the separation roller ( Release) mechanism is required, and as a mechanism to separate the separation piece from the separation roller and release it, for example,
A technique as disclosed in Japanese Patent Application Laid-Open No. 59-13256 has been proposed.

[0008]

However, in the above-mentioned conventional example, the user sets a plurality of original bundles without the user noticing that the separation piece is released from the separation roller. When facsimile transmission is performed, the document bundle cannot be separated because no frictional force acts between the sheet and the separation piece when the document is conveyed, and there is a possibility that double feeding may occur.

The present invention has been made to solve the above problems, and
The purpose of the invention is to provide a sheet conveying apparatus which prevents a trouble such as double feeding by allowing a user to easily recognize that the friction means is separated from the sheet conveying means and the friction is released, and which is provided with the same. And an image reading apparatus provided with the same.

[0010]

In order to achieve the above object, a typical configuration of a sheet conveying apparatus according to the present invention comprises a sheet conveying means for conveying a sheet, and a sheet conveying means disposed opposite to the sheet conveying means. A sheet conveying device that has a friction unit and a pressing unit that presses the friction unit against the sheet conveying unit, and separates the friction unit from the sheet conveying unit in a sheet conveying apparatus that frictionally separates and transports the stacked sheets. Friction releasing means for releasing the friction by operating the friction releasing means, and operating the friction releasing means to separate the friction means from the sheet conveying means to release the friction. The means is configured to protrude outside the apparatus main body.

[0011] According to the above construction, the friction releasing means separates the friction means from the sheet conveying means to release the friction, so that thick paper such as business cards and sheets such as photographs, newspapers or magazines are not damaged and the back side is not damaged. It can be conveyed without leaving traces of rubber, etc. When the friction is released by separating the friction means from the sheet conveying means by the friction releasing means, the operating means projects outside the apparatus main body because it protrudes outside the apparatus main body. The user can easily recognize that the friction means has been separated from the sheet conveying means and the friction has been released by recognizing the operated means by the user.

Further, when a rotating body such as a roller is used as the sheet conveying means, when an elastic spring is used as the pressing means, or a rubber piece made of a rubber member having a large friction coefficient is used as the friction means. In such a case, it is possible to provide a friction-separation type sheet conveying device with a simple configuration.

Further, when the sheet conveying means is configured to convey a sheet inserted from a sheet insertion port, and when the operating means is disposed on the sheet insertion port side, a user can transfer the sheet to the sheet insertion port. It is possible to easily recognize whether or not the operating means is protruding outside the apparatus main body when inserting from the main body, and thereby, it is possible to determine whether or not the friction means is separated from the sheet conveying means and the friction is released. Easy to recognize.

Further, when the friction releasing means separates the friction means from the sheet conveying means to release the friction, the operation means projects to the central portion of the sheet insertion opening side. When the user inserts the sheet from the sheet insertion port, it is possible to easily recognize whether or not the operation means projects to the center of the sheet insertion port side, thereby separating the friction means from the sheet conveying means. It can be more easily recognized whether or not the friction is released.

Further, when the operating means and the friction releasing means are constituted by one member, the number of parts can be reduced and the structure of the apparatus can be simplified, so that the cost of the apparatus can be reduced.

The operating means comprises a releasing lever having an inclined portion serving as the friction releasing means and a flat portion. When the releasing lever is operated, the pressing means which presses the friction means with the inclined portion of the releasing lever. The friction means is separated from the sheet conveying means against the pressing force of the means, and the state is maintained by the flat portion of the release lever to keep the friction means separated from the sheet conveying means. With such a configuration, the configuration of the device is simple and preferable.

It is preferable that the release lever is formed in a color different from the color of the exterior of the apparatus main body and the sheet, since the release lever is visually conspicuous when projected outside the apparatus main body.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention applied to a facsimile apparatus as an example of a sheet conveying apparatus and an image reading apparatus having the same. FIG. 1 is a perspective view showing a configuration of an image reading apparatus provided with a sheet conveying apparatus according to the present invention, FIG. 2 is a cross-sectional explanatory view showing a configuration of an image reading apparatus provided with a sheet conveying apparatus according to the present invention, and FIG. FIG. 4 is an explanatory cross-sectional view showing a configuration of a main part of an image reading apparatus provided with the sheet conveying apparatus according to the present invention; FIG. 4 is an enlarged cross-sectional explanatory view showing a state in which friction means of the sheet conveying apparatus according to the present invention is released; FIG. 6 is a perspective view showing a configuration of a friction releasing unit, FIG. 6 is a diagram showing a position of a release lever in a state where the friction unit is pressed against the sheet conveying unit, and FIG. 7 is a diagram showing a position of the release lever in a state in which the friction unit is released. FIG. 8 is a view of the position of the release lever in a state where the friction means is pressed against the sheet conveying means as viewed from the operation panel side, and FIG. 9 is a view of the position of the release lever in a state where the friction means is released as viewed from the operation panel side. FIG. 10 shows another configuration of the release lever. FIG. 11 is a view of the position of the release lever shown in FIG. 10 in a state where the friction means is pressed against the sheet conveying means as viewed from the operation panel side, and FIG. 12 is a release lever shown in FIG. 10 in a state where the friction means is released. FIG. 13 is a diagram showing an example in which a message is written on the surface of the release lever.

1 and 2, a color reading facsimile apparatus 1 as an image reading and recording apparatus includes a color scanner section 2 as a document-conveying color image reading apparatus inside a housing constituting the front, rear, left and right wall surfaces of FIG. , A serial recording apparatus, a color control board (not shown) and a power supply (not shown). These components are individually configured so that they can be easily replaced and detached.

The housing includes a lower cover 3 serving as a first housing serving as a lower housing, an upper cover 4 serving as an upper housing, and a third cover for guiding the recording sheet S and covering a power supply. It basically comprises a rear cover 19 which is a housing.

The upper cover 4 is provided with a side guide 5 which is adjustable in width to guide the document D in the width direction, and which moves about one central portion by moving only one side. The document table 6 is rotatably supported by the upper cover 4 to enable access to a recording head 7 serving as recording means.

A detachable document placing tray 8 is provided at the rear of the document table 6. For example, when a sheet-shaped document D of A4 size is conveyed forward toward the color scanner unit 2, its rear end hangs down. I try not to be.

The original D conveyed forward with the original surface facing downward is conveyed from below the color scanner unit 2 to the front of the facsimile machine 1 and discharged and placed on the original discharge tray 9. The document discharge tray 9 is configured to be movable in the direction of arrow a in FIG. 1 (the front-back direction of the facsimile machine 1).

On the other hand, after the recording sheet S conveyed to the recording apparatus is regulated in the width direction by the movement of the side guide 11 provided on the recording sheet table 10 disposed on the back side of the facsimile machine 1, After serial recording in a printer unit 12 described later, which is an ink jet recording unit, the sheet is discharged onto a recording sheet table 10 below the color scanner unit 2.

When the recording sheet S is conveyed so that its longitudinal direction is in the front-rear direction of the facsimile machine 1, the rear recording sheet support 13 and the front recording sheet support are used to prevent the recording sheet S from hanging down. A rod 14 is provided.

The recording sheet support table 13 is built in the recording sheet table 10, and is configured to be brought to the position shown in FIG. Also, the recording sheet support bar on the near side
Reference numeral 14 is provided so as to be able to be pulled out in the front-rear direction, similarly to the document discharge tray 9 including the document support bar described above.

The upper cover 4 is, as shown in FIG.
The lower cover 3 has a shape surrounding the color scanner unit 2 and extends along the edge 4 a of the upper cover 4.
By removing the color scanner unit 2 from the lower cover 3, the color scanner unit 2 can be opened while being left on the lower cover 3.

A scanner main body and an operation panel 15 are connected to the color scanner 2 so as to open and close about a hinge (not shown). The operation panel 15
An operation unit such as a liquid crystal display unit 16 and push button keys 17 is disposed in the display unit.

FIG. 3 is a three-dimensional exploded view of the sheet-type document feeder provided in the facsimile apparatus 1 in which the upper cover 4 is omitted, and an opening surface surrounded by a base serving as a bottom surface and a side wall serving as an exterior is integrally formed. Document D is placed inside the lower cover 3
A color scanner unit 2 which is an original transport image reading apparatus that reads an image written on the original surface of the original D while transporting the recording sheet S, and a serial recording apparatus that performs serial recording while transporting the recording sheet S. A printer unit 12, a color control board (not shown) for performing predetermined control by being connected to the printer unit 12, a power supply, an ink absorber 18 for absorbing ink that becomes unnecessary when ink is initially ejected from the recording head 7, and a rear cover 19, the recording sheet table 10, and all of the speakers (not shown) can be fixed to the lower cover 3 without using any tools.

Next, the configuration of each section will be described in detail with reference to FIG. First, the document D is placed on the document table 6. The color scanner unit 2 irradiates the original surface of the original D with light and converts the reflected light into an electric signal, and transmits the electric signal to another machine or to its own printer unit 12 according to the operation mode. Things.

In the main body of the color scanner unit 2, the scanner base 20 is a frame of the color scanner unit 2,
The document D is fixed to the lower cover 3 to guide the lower side thereof. Also, on the scanner base 20, a separation roller 21 as a rotating body serving as a sheet conveying means for feeding out the document D, a feeding roller 22 for conveying the document D, a discharge roller 23 for discharging the document D onto the document discharge tray 9, and a document A color contact sensor 24 or the like serving as image reading means for reading the image information of D is provided.

The operation panel section 15 is rotatably attached to the scanner base 20 by a fulcrum (not shown).
A separating piece 26 made of a rubber member serving as a friction means is disposed opposite to the upper document guide 25 for guiding the upper side of the document D and the separating roller 21, and is pressed against the feeding roller 22 and the discharging roller 23, respectively. A feed roller 27 and a discharge roller 28 are disposed, a reading white background 29 serving as a reading white reference is disposed by being pressed against the color contact sensor 24, and the pressing of the separation piece 26 for conveying a thick document D or the like is released. Release lever which serves as friction releasing means and also operates as operating means for operating the friction releasing means
30 mags are provided.

The operation panel section 15 attached to the upper document guide 25 forms a part of the exterior, and includes operation keys such as push button keys 17 and a liquid crystal display section 1 such as an LCD (liquid crystal device).
6, a panel board and the like on which they are mounted are provided.

Here, the original D of the color scanner unit 2
The transport, reading operation, and the like are performed by a motor, a sensor drive circuit, and the like (not shown), and the control of these and the display control of the liquid crystal display unit 16 are controlled by a color control board (not shown).

Next, the printer section 12 will be described. The printer section 12 is provided with a recording sheet table 10 supporting a middle plate 10a by a fulcrum (not shown), and the middle plate 10a is pressed by a spring. The base of the recording sheet table 10 is fixed to the main body of the printer unit 12 with screws or the like.

The recording sheet S is stacked on the middle plate 10a,
The back surface is supported by a recording sheet support table 13 and a recording sheet table 10 provided on the base of the recording sheet table 10 so as to be extendable and contractible, and the position in the width direction is regulated by a side guide 11 movably provided on an intermediate plate 10a. Is done. Also, feed roller
Numeral 31 feeds out the recording sheets S one by one and sends them out to the printer unit 12.

Numeral 32 denotes a conveying roller, and the recording sheet S sent from the recording sheet table 10 by the pressing of the pinch roller 33 arranged opposite thereto is opposed to the recording head 7 arranged further downstream. Send it out to the recording unit. Numeral 34 denotes a platen which supports the back surface of the recording sheet S facing the recording head 7. On the front side of the recording sheet S, a recorded image is recorded by the recording head 7 mounted on a carriage 36 which is supported by a guide shaft 35 and reciprocates. Is formed. Thereafter, the recording sheet S is discharged from the printer unit 12 by the discharge roller pair 37 and is discharged and placed on a recording sheet discharge table 38 provided on the lower cover 3.

Here, the recording sheet S of the printer unit 12 is used.
Are carried out by a motor, a sensor, a head drive circuit and the like (not shown), and the control of these is controlled by a control board unit (not shown). Also, the recording relay board 39
Relays signals of these motors, sensors, head drive circuits, etc., and transfers them to the control board unit. In addition, an ink absorber 18 that absorbs waste ink generated at the time of operation such as ink clogging prevention in the printer unit 12 is attached to the lower cover 3.

Next, the flow of the document D will be described. FIG.
3 is an enlarged cross-sectional view of the color scanner unit 2, and the conveyance path of the document D is as shown by the arrow b in FIG. 2, the document D is placed on the document placing tray 8 with the image side of the document D facing downward. The document D placed on the document placing tray 8 is positioned by a side guide 5 movable in the width direction.

Reference numeral 40 denotes a preliminary transport arm, which is disposed at a position facing the separation roller 21. The preliminary transport arm 40 is pressed against the separation roller 21 by a preliminary transport pressing spring 41. Therefore, the original D bundle inserted and set from the original insertion opening 42 serving as the sheet insertion opening is preliminarily conveyed by the leading end being loosened by the cooperation of the preliminary conveyance arm 40 and the separation roller 21.

The separating piece 26 is a pressing means from above in FIG. 3 and is separated from the separating roller 21 by an ADF spring 43 composed of an elastic spring.
Is pressed, and the preliminarily conveyed document D is separated and conveyed one by one from below by the cooperation of the separating piece 26 and the separation roller 21. Further, the separation roller 21 also has a role of conveying the document D to the feeding roller 22.

The original D conveyed by the separation roller 21 is nipped by a feed roller 22 and a feed roller 27 facing the feed roller 22, and is conveyed to a reading position where the color contact sensor 24 is opposed to the color contact sensor. The image of the original D is read by 24. The reading white background 29 arranged opposite to the color contact sensor 24 is formed of a white background sheet metal,
3 is urged from above by a white background spring 44 along the reading line of the color contact sensor 24 to bring the image of the separated and conveyed document D into close contact with the reading line of the color contact sensor 24.

The original D whose image has been read by the color contact sensor 24 is conveyed while being nipped and held by the discharge roller 23 and the discharge roller 28 opposed thereto, and is placed on the original discharge tray 9 which is detachably attached to the main body of the facsimile machine 1. Is discharged and placed.

Next, the configuration of the document separating and conveying section A shown in FIG. 3 will be described with reference to FIGS. In FIG.
The document D is inserted and set from a document insertion port 42 formed between the document upper guide 25 and the document lower guide 45.

The separating piece 26 is formed of a rubber piece having a relatively large coefficient of friction mounted on the ADF holder 46, and the preliminary transport arm 40 is formed of a plastic member having a relatively small coefficient of friction. A projection shaft 46a extends from the ADF holder 46.

The preliminary transport arm 40 is provided with a concave portion 40a in which the projection shaft 46a of the ADF holder 46 is fitted.
The projection shaft 46a is fitted to and mounted on a. Thus, the preliminary transfer arm 40 is configured to be rotatable around the concave portion 40a.

The preliminary transfer pressing spring 41 is constituted by a tension coil spring, and one end of the preliminary transfer pressing spring 41 is connected to a preliminary transfer arm.
The ADF holder 46 is engaged with the projection locking portion 40 b of the ADF holder 46.
Are engaged with the projection locking portions 46b.

The document upper guide 25 is provided with a concave portion (not shown), and the projection shaft 46a of the ADF holder 46 is fitted and attached to the concave portion so that the ADF holder 46 is centered on the projection shaft 46a. It is configured to be rotatable.

The ADF holder 46 is located at a position facing the separation roller 21, and the preliminary transport arm 40 and the separation piece 26
It is arranged to contact with. One end of the ADF spring 43 is engaged with the spring receiving surface 46c of the ADF holder 46, and the other end of the ADF spring 43 is engaged with the operation panel section 15. The ADF spring 43 is a compression coil spring.
The separation member 26 provided below the ADF holder 46 is pressed against the separation roller 21 by the elastic force of the DF spring 43.

FIGS. 6 and 7 are plan views when the ADF holder 46 and the release lever 30 are incorporated in the upper document guide 25. The release lever 30 for releasing the friction by separating the separation piece 26 from the separation roller 21 is shown in FIG. The release lever 30 is attached so as to be rotatable around a shaft 25 a provided on the original upper guide 25.
An inclined portion 30a and a flat portion 30b are formed at one end.

As shown in FIG. 6, an operation knob 30c disposed on the side of the document insertion port 42 of the release lever 30 is moved to the document upper guide 25.
ADF holder when positioned approximately along the edge 25b of the ADF
The inclined portion 30a of the release lever 30 is not in contact with the protrusion 46d provided on the 46, and at this time, the separating piece 26 is
The separation roller 21 is pressed by the pressing force of 43.

When the release lever 30 is rotated in the direction of arrow c in FIG. 6 around the shaft 25a by operating the operation knob 30c, the inclined portion 30a of the release lever 30
After the ADF holder 46 is rotated in the upward direction in FIG. 5 against the pressing force of the ADF spring 43 around the protruding shaft 46a by sliding against the 46d, the flat portion 30b of the release lever 30 is moved to the ADF holder. When the separation piece 26 separates from the separation roller 21 and is released by releasing the friction while the separation piece 26 is separated from the separation roller 21 at this time, the operation knob 30c is moved to the original insertion guide 42 at the center of the original insertion port 42 to guide the upper document.
25 (see FIG. 7). FIG. 4H shows the separation piece 26 and the separation roller when the release lever 30 is in the state shown in FIG.
This is the gap created between the gap and 21.

Since the force of the ADF spring 43 pressing the ADF holder 46 is strong, the preliminary transport arm 40 is pressed against the separation roller 21 by the elastic force of the preliminary transport pressing spring 41. Therefore, even when the release lever 30 is operated, the preliminary transport arm 40 maintains the state pressed by the separation roller 21. Therefore, the pressing position of the preliminary transport arm 40 is the same as when the separation piece 26 is not separated from the separation roller 21.

In the state shown in FIG. 7, since the frictional force does not act between the separating piece 26 and the document D, the function of separating a plurality of document D bundles is reduced, but one sheet of thick paper or the like can be fed.
In addition, since rubber marks of the separation piece 26 do not adhere to the back surface of the original D and there is no scratch caused by friction with the separation piece 26, newspaper clipping, color pages of magazines, color photographs,
An image can be read by transporting a document D such as a business card.

As described above, the operation knob 30 of the release lever 30 can be used without the user having to disassemble the device.
By operating c, the separation piece 26 is separated from the separation roller 21 and can be released.

Next, the release lever 30 on the external appearance of the facsimile machine 1 when the separation piece 26 is released with reference to FIGS.
Will be described. FIG. 8 shows the separation piece 26 as a separation roller.
21 shows the normal state of pressing, and at this time, the release lever
The portion where the 30 operation knobs 30c are exposed to the outside of the apparatus is very small, and is set so that it is slightly visible to the user.

Operation knob of the release lever 30 from the state of FIG.
By operating 30c in the direction of arrow c in FIG.
Is released from the separation roller 21, and at the same time, the operation knob 30c projects from the center of the document insertion slot 42 (see FIG. 9).

As shown in FIG. 9, when the separation piece 26 is released, the operation knob 30c is located substantially at the center of the document insertion slot 42.
When the user tries to insert the bundle of originals D into the original insertion slot 42 and set it, the separating piece 26 is separated from the separation roller 21 by the external appearance (the state in which the operation knob 30c is extended). It can be easily recognized that the state has been released by being separated from. For this reason, it is possible to prevent an erroneous operation of setting a plurality of documents D in a state where the separation piece 26 is separated from the separation roller 21 and released.

As described above, the user operates the operation knob 30 from outside the apparatus without disassembling the apparatus.
By operating the release lever 30 by operating c
26 can be released by separating from the separation roller 21, and the user can easily recognize the current pressing state of the separation piece 26 from the appearance.

An operation knob 30c serving as an operation means,
Since the inclined portion 30a and the flat portion 30b serving as friction releasing means are constituted by the release lever 30 formed of one member, the number of components can be reduced, the configuration can be simplified, and the cost can be reduced.

In the release lever 30 shown in FIGS. 8 and 9, the operating knob 30c operated by the user can be made a thin member to reduce the material cost. However, as shown in FIGS. By increasing the width of the operation knob 30c and forming it in the shape of a "<", it is possible to more easily recognize the state when the separation piece 26 is released.

FIG. 11 shows a normal state in which the separation piece 26 is pressed against the separation roller 21. At this time, the portion where the operation knob 30c of the release lever 30 is exposed to the outside of the apparatus is very small, and is slightly exposed to the user. It is set to be visible.

The operation knob of the release lever 30 from the state of FIG.
By operating 30c in the direction of arrow c in FIG.
Is released from the separation roller 21, and at the same time, the operation knob 30c projects from the center of the document insertion slot 42 (see FIG. 12).

As described above, when the user tries to set a plurality of originals D in a state in which the separation piece 26 is separated from the separation roller 21 and released, the operation knob 30c is smaller than when the operation knob 30c is a thin member. The user can easily recognize that the length D extends in the width direction. Thus, when the document D is set, the separation tab 26 is separated from the separation roller 21 and released when the operation knob 30c is a thin member.
An erroneous operation such as insertion of a bundle can be prevented to prevent double feeding of the document D.

If the color of the operation knob 30c is different from the color of the operation panel unit 15 and the document D, the user can easily recognize the state of the separation piece 26. Generally, the back side of the document D has a color close to white in many cases, and when the operation panel unit 15 of the facsimile apparatus 1 is also a color close to white, the color of the operation knob 30c is constituted by, for example, red, green or dark gray. Then, when the separation piece 26 is released, the operation knob 30c stands out from the document D or the operation panel unit 15, and the user can easily recognize the state of the separation piece 26.

As shown in FIG. 13, a message (for example, "ADF" is displayed on the upper surface of the operation knob 30c of the release lever 30.
OFF), "A Thick Sheet", "Sheets cannot be
The user can easily recognize the state of the separation piece 26 when the separation tab 26 is released and the operation knob 30c protrudes out of the operation panel section 15 by describing "separated" or the like.

According to the above configuration, the separation piece 26 can be separated from the separation roller 21 and released by operating the operation knob 30c, so that the release operation of the separation piece 26 is easy, and When the sheet is released, it is possible to feed one sheet of the original D having a print on the thick paper or the back side thereof, and additionally, the rubber mark of the separation piece 26 does not adhere to the back side of the original D.
Originals such as newspaper clippings, magazine color pages, color photos, business cards, etc.
To read the image.

When the separating piece 26 is released, the operation knob 30c is set outside the facsimile machine 1 outside the document insertion port.
The state of the separation piece 26 protrudes from the substantially central portion of 42, so that the state of the separation piece 26 can be easily recognized by the position and appearance of the operation knob 30c.

[0069]

Since the present invention has the above-described structure and operation, the friction releasing means can separate the friction means from the sheet conveying means and release the friction by operating the operating means. It is easy to release the means, and if the friction means is separated from the sheet conveying means and set to the state where friction is released, thick paper or a sheet-like document with printing on both sides can be made without dirt or scratches such as rubber marks Since the document can be transported, the security of the document can be ensured. When the friction is released, the operating means protrudes out of the apparatus, so that the user can easily recognize that the friction means has been released. It is possible to prevent an erroneous operation such as setting a plurality of sheets in the sheet insertion slot sometimes.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of an image reading apparatus including a sheet conveying apparatus according to the present invention.

FIG. 2 is an explanatory cross-sectional view illustrating a configuration of an image reading device including a sheet conveying device according to the present invention.

FIG. 3 is an explanatory cross-sectional view illustrating a configuration of a main part of an image reading apparatus including a sheet conveying device according to the present invention.

FIG. 4 is an enlarged cross-sectional explanatory view showing a state in which a friction unit of the sheet conveying device according to the present invention is released.

FIG. 5 is a perspective view showing a configuration of a friction releasing unit.

FIG. 6 is a diagram illustrating a position of a release lever in a state where a friction unit is pressed against a sheet conveying unit.

FIG. 7 is a diagram illustrating a position of a release lever in a state where a friction unit is released.

FIG. 8 is a view of the position of the release lever in a state where the friction unit is pressed against the sheet conveying unit, as viewed from the operation panel side.

FIG. 9 is a view of the position of the release lever in a state where the friction means is released, as viewed from the operation panel side.

FIG. 10 is a plan view illustrating another configuration of the release lever.

FIG. 11 is a diagram illustrating a state in which the friction unit is pressed against the sheet conveying unit.
FIG. 11 is a view of the position of a release lever shown in FIG. 10 viewed from the operation panel side.

12 is a view of the position of the release lever shown in FIG. 10 in a state where the friction means is released, as viewed from the operation panel side.

FIG. 13 is a diagram illustrating an example in which a message is written on a surface of a release lever.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Facsimile apparatus, 2 ... Color scanner part, 3 ... Lower cover, 4 ... Top cover, 4a ... Edge, 5 ... Side guide, 6 ... Document table, 7 ... Recording head, 8 ... Document mounting tray, 9 ... Document discharge tray, 10: recording sheet table, 10a: middle plate, 11: side guide, 12: printer unit, 13: recording sheet support table, 14: recording sheet support rod, 15: operation panel unit,
16: liquid crystal display, 17: push button key, 18: ink absorber, 19: rear cover, 20: scanner base, 21: separation roller, 22: feed roller, 23: discharge roller, 24: color contact sensor, 25 … Guide on original, 25a… Axis, 25b…
End, 26 ... Separation piece, 27 ... Feed roller, 28 ... Discharge roller, 29 ...
Read white background, 30 release lever, 30a inclined section, 30b flat section, 30c operation knob, 31 feed roller, 32 transport roller, 33 pinch roller, 34 platen, 35 guide shaft, 36 Carriage, 37: Discharge roller pair, 38: Recording sheet discharge table, 39: Recording relay board, 40: Preliminary conveyance arm, 40a
... concave part, 40b ... projection locking part, 41 ... preliminary conveyance pressing spring,
42 ... Document insertion slot, 43 ... ADF spring, 44 ... White background spring, 45 ...
Document lower guide, 46: ADF holder, 46a: Projection shaft, 46b
... Projection locking portion, 46c ... Spring receiving surface, 46d ... Projection, A ... Document separation and conveyance portion, D ... Document, S ... Recording sheet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Atsushi Saito 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (10)

[Claims] 1. A stacking device comprising: a sheet conveying means for conveying a sheet; a friction means arranged to face the sheet conveying means; and a pressing means for pressing the friction means against the sheet conveying means. A sheet conveying apparatus that conveys the separated sheet by friction separation, comprising: a friction releasing unit that releases the friction by separating the friction unit from the sheet conveying unit; and an operating unit that operates the friction releasing unit. The sheet conveying apparatus according to claim 1, wherein when the friction is released by separating the friction means from the sheet conveying means by the friction releasing means, the operating means projects outside the apparatus main body. 2. The sheet conveying apparatus according to claim 1, wherein said sheet conveying means comprises a rotating body. 3. The sheet conveying apparatus according to claim 1, wherein said pressing means comprises an elastic spring. 4. The sheet conveying apparatus according to claim 1, wherein said friction means is made of a rubber member. 5. The sheet conveying device according to claim 1, wherein the sheet conveying unit is configured to convey a sheet inserted from a sheet insertion slot, and the operation unit is disposed on the sheet insertion slot side. Sheet transport device. 6. When the friction is released by separating the friction means from the sheet conveying means by the friction releasing means, the operating means is configured to protrude toward a central portion of the sheet insertion opening side. The sheet conveying device according to claim 5, wherein 7. The method according to claim 1, wherein the operating unit and the friction releasing unit are one.
The sheet conveying device according to claim 6, wherein the sheet conveying device is formed of a member. 8. The operating means comprises a release lever having an inclined portion serving as the friction releasing device and a flat portion, and when the release lever is operated, the pressing means which presses the friction means with the inclined portion of the release lever. The friction means is separated from the sheet conveying means against the pressing force of the means, and the state is maintained by the flat portion of the release lever to keep the friction means separated from the sheet conveying means. The sheet conveying device according to claim 7, wherein the sheet conveying device is configured as described above. 9. The sheet conveying apparatus according to claim 8, wherein the release lever is formed in a color different from a color of an exterior of the apparatus main body and a sheet. 10. An image reading apparatus, comprising: the sheet conveying apparatus according to claim 1; and an image reading means for reading image information of a sheet-shaped document conveyed by the sheet conveying apparatus.