JPH08195852A - Reader - Google Patents

Abstract

PURPOSE: To provide a reader provided with an ADF including a light-weight pressing plate part with improved operability by separately arranging a sheet original separation means and a pressing plate for pressing a book original. CONSTITUTION: This reader is constituted of a movably constituted contact sensor 1, the pressing plate 2 for pressing the original, a separation part 3 for separating the plural sheets of the original one by one, a member 4 to be a white reference, a recording part 5, a control part 6 for performing the control of the entire reader such as the setting of a book mode and a sheet mode and the control of the recording part 5, etc., a power source part 7, a press roller, a base 17 and a cover 18, etc. By such constitution, in the case of reading the book original, the pressing plate 2 is pushed up, the book original is set at a prescribed position (set on the original size mark of the member 4) on a contact glass 16, the pressing plate 2 is pushed down, the original is fixed and then, the contact sensor 1 is moved between the positions 1h-1c, the lower surface of the member 4 as the white reference is used and read is performed in the recording part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading device such as a facsimile machine, and more particularly to a reading device provided with an automatic paper feeding device (hereinafter referred to as ADF) including a pressure plate which is light and easy to operate.

[0002]

2. Description of the Related Art In conventional facsimile machines and copying machines, an ADF integrated with a pressure plate for book originals is generally used. FIG. 2 is a diagram showing a partial configuration of a conventional facsimile apparatus, which includes an ADF 21 (pickup roller 21a, pressure roller 21b, conveying roller 21c,
Document table 21d, holder 21 for holding a separation pad
is used as a pressure plate for book manuscripts,
The book document is fixed by being sandwiched between the ADF 21 and the glass plate 22 on the main body side. Then, it is illuminated by a light source (not shown) of the recording unit 23, and the reflected light is guided to a reading element by a mirror (not shown) and read line by line. It should be noted that the originals placed on the original table 21d are separated one by one by a separation pad (not shown), and are conveyed to a reading position by a conveying path including the conveying rollers 21c. In addition, 24 is a control part and 25 is a power supply part. Further, the white pressure plate in the portion for reading the book original has a belt-like structure, and when the sheet original is read by using the separating device such as the separation pad, the belt-like pressure plate is rotated, while the book original is read. Read without rotating the belt-shaped pressure plate. Japanese Patent Application Laid-Open No. 6-92514 discloses a sheet conveying device in which a pressure plate and a separating portion are integrated with each other. In addition, JP-A-5-17611
Japanese Unexamined Patent Publication 7 describes an apparatus for reading a book document and a sheet document by moving a common contact sensor.

[0003]

The above-mentioned prior art has the following problems. (1) Since the pressure plate with a document separating device used in a copying machine or the like has its own drive system, the pressure plate portion becomes heavy and holds the pressure plate at top dead center (or open state). Therefore, a member that generates a high load such as a torsion bar is required. Further, a member that supports the high load is required, and a stronger member is required to hold the pressure plate portion. (2) If the pressure plate has electrical components, the power supply and signal cable must be joined to the pressure plate unit.
Assembly was bad. In particular, a reversing mechanism (Japanese Patent Laid-Open No. 6-9251)
In the case of a device for reading a sheet original according to the publication No. 4), the pressure plate has functions such as a motor and original detection.
The number of parts was increasing. (3) Since the drive system is provided separately from the main body, the number of parts is large and the unit is expensive. In addition, since the number of parts is large and heavy, the user has to use unnecessary force when opening and closing the pressure plate. (4) There is a possibility that a non-feed may occur due to the conveyance load of the portion where the document is conveyed. Further, the relative position between the document table and the ADF unit cannot be changed arbitrarily. (5) In the configuration in which the portion for separating and conveying the original document and the original table are separated, when the original document is set, the leading edge of the original document is caught in the entrance of the separation section and cannot be set smoothly. (6) When reading a document, if the white reference is provided on the path along which the document is conveyed, dirt on the document attaches to the white reference, and the white reference deviates. (7) Since the surfaces other than the surface used as the white reference are not used for the document conveyance, a separate guide plate for conveying the document is required and the number of parts is increased. (8) Since dedicated parts are used as marks for setting book originals, the number of parts is large. SUMMARY OF THE INVENTION An object of the present invention is to provide a reading device provided with an ADF including a pressure plate portion that is light in weight and has good operability, by solving such problems. In particular, it is an object to reduce the number of parts and to make the structure lightweight and inexpensive. It also aims to have a simple and durable structure. Further, another object of the present invention is to set a document smoothly and reduce the load of document conveyance. Another object is to configure the reading operation to be started in a short time. Another object is to configure so that the white reference can be set accurately.

[0004]

In order to achieve the above object, the reading device of the present invention is characterized in that the sheet document separating means (3 in FIG. 1) and the pressure plate for pressing the book document are separately arranged. is there. More specifically, the separating portion (3 in FIG. 1) is fixed to the apparatus main body, and the pressure plate (2 in FIG. 1) can be independently opened and closed. Further, ribs (15 in FIG. 1) are provided on the upper surface of the pressure plate to form a table for setting the original. In addition, the rib is located higher than the lower surface of the document guide of the separating portion when the pressure plate is closed. Further, a white reference member (4 in FIG. 1) is provided on one surface below the separation roller of the separation section, a guide plate for conveying sheet originals is provided on the other surface, and a part of the member is used for setting book originals. The marker is provided.

[0005]

In the present invention, the pressure plate for pressing the book original and the separating portion for the sheet original are divided, and ribs are provided on the upper surface of the pressure plate to be used as a table for setting the original.
The number of parts can be reduced by not using the white reference sheet member, or by using a part of the white reference member at the bottom of the separation part as a guide plate and adding a marker when setting a book document. You can Further, in addition to the above, by fixing the separating portion to the main body side and not providing a drive system for the pressure plates arranged in a divided manner, it is possible to configure the pressure plate portion in a lightweight and inexpensive manner. In addition, noise generation by the drive unit is small. In addition, a table for document setting is not specially provided, the drive system on the main body side has no impact due to opening and closing of the pressure plate, and the cover is smaller than the conventional integrated structure, so that a simple and durable structure can be achieved. . Also,
The pressure plate is not provided with a drive system, the relative position of the pressure plate and the separating portion is arbitrarily adjusted by the rib on the upper surface of the pressure plate, and the inclined surface is provided on the rib.
By setting the rib position higher than the document insertion port, the document can be set smoothly and the document feeding load can be reduced. Further, the separation roller located above the white reference member is
Since it is arranged between the book document reading position and the sheet document reading position, the movement distance of the contact sensor is short and the operation can be started in a short time. Moreover, since the white reference is fixed on the contact glass surface, an accurate white reference can be obtained.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a schematic configuration of a reading device according to an embodiment of the present invention, FIG. 3 is a perspective view showing its appearance, and FIG.
FIG. 3 is a perspective view showing a configuration of a separating portion according to an embodiment of the present invention. Reference numeral 1 denotes a movable contact sensor, which moves between positions 1b to 1c in accordance with a document in the book mode to perform reading, and in the sheet mode to position 1a.
It is fixed to and is configured to perform reading. Two
Is a pressure plate for pressing an original, and is installed separately from the separating portion 3 and is configured to hold the opened / closed state by a damper, a spring or the like (not shown). Further, a magnet (not shown) is provided at the end of the pressure plate, and when setting a book document having an appropriate thickness, a book document 30 is placed between the pressure plate 2 and the contact glass 16 as shown in FIG. It is configured to be held by a sandwiching magnet. For thick book originals, press platen 2 by hand to set. Further, it has a rib 15 on the upper surface of the pressure plate and is also used as a document table. The ribs 15 can adjust the relative positions of the pressure plate 2 and the separating portion 3. For example, the ribs 1
By setting the position of 5 to be slightly higher than the position of inserting the document into the separating portion 3, it is possible to prevent the document from colliding with the entrance. Further, the rib 15 may be formed to have an inclined surface so that the document can be conveyed more smoothly. In addition,
The height of the ribs 15 is adjusted in order to cope with height variations caused by variations in assembly and variations in parts at the stage of assembly, and due to changes over time, elastic members (eg, sponge) of the pressure plate portion. This is because the readjustment is performed when the thickness becomes thin. In this embodiment, since the rib 15 is used as a guide plate, the height of the guide plate can be changed by raising the rib 15 with a mold. Alternatively, the height can be easily changed by adding a cap-shaped member to the rib 15. On the other hand, in the conventional platen,
It is necessary to adjust the height with respect to the lower surface of the separating portion guide plate by raising the entire pressure plate or increasing the thickness of the elastic member of the pressure plate portion. Reference numeral 3 is a separation unit for separating a plurality of sheet originals one by one, and is composed of a separation roller 8, a conveyance roller 9, a pressure plate 12, a pickup roller 13, etc., and is installed separately from the pressure plate 2. There is. Further, the separation roller 8 is arranged between the reading position of the book original and the reading position of the sheet original, and in each case, the same white reference (the lower surface of the member 4) is used to read the short moving distance in a short time. It is configured to start operation. 4 is
A member serving as a white reference, and a surface located below the separation portion and in contact with the upper surface of the contact glass 16 (a surface using the white reference in FIG. 4) is used as the white reference. In this embodiment, the belt-shaped white pressure plate is abolished to be a fixed type pressure plate, and the structure of the pressure plate portion includes a fixed type white pressure plate (white reference of the member 4) and a cover (not shown) for protecting it. Only three hinges (not shown) for fastening the cover and the main body are provided. Also, the member 4
Marks (A3, B4, etc.) indicating the document size are written on the end face of the. The transport roller 10 side of the member 4 is used as the document guide 20. A recording unit 5 is composed of a light source and an optical reading system (not shown). Reference numeral 6 denotes a control unit that controls the entire apparatus such as setting a book mode / sheet mode and controlling the recording unit, and 7 denotes a power supply unit. In addition, 11 is a pressure roller, 17
Is a base and 18 is a cover.

With such a configuration, when reading a book original, as shown in FIG. 5A, the pressure plate 2 is pushed up to set the book at a predetermined position (set by the original size mark on the member 4) on the contact glass 16. After the original is set and the pressure plate 2 is pushed down to fix the original, the contact sensor 1 is moved to the position 1b.
1 to 1c, and the recording unit 5 reads using the lower surface of the member 4 as a white reference. On the other hand, when reading a plurality of sheet originals, as shown in FIG.
, And press it against the contact glass 16, press plate 2
The sheet original 40 is set on the rib 15. The sheet original 40 is conveyed from between the pickup roller 13 and the pressure plate 12, and is separated by the separating roller 8 and the feed roller 9.
The discharge roller 1 is separated sheet by sheet and passes through the guide plate 20.
0 and before the pressure roller 11 are read by the recording unit 5. In this case, the contact sensor 1 is moved and fixed to the position 1a according to the setting of the sheet mode, and is controlled to return to the original position (standby state) when the reading operation of the member 4 using the white reference is completed.

[0008]

According to the present invention, the following effects can be obtained. (1) By dividing the pressure plate and the separation portion, the number of parts of the pressure plate portion can be reduced, and a lightweight and inexpensive pressure plate can be manufactured. Moreover, since it is lightweight, it is easy and safe to operate. Further, due to the weight reduction, when the open / close portion is held in the opened state, the use load of the holding damper, spring, etc. can be made small and simple. (2) Since the separation unit is fixed to the main body, the drive system is not affected by opening and closing during use, and is unlikely to malfunction. Further, the number of covers can be reduced as compared with the case where the drive unit is integrally configured with the pressure plate. (3) Since it is not necessary to attach a table for sheet originals, the number of parts is reduced and an inexpensive product can be manufactured. In addition, it is not necessary to provide a space for the table, which helps save space. (4) The load can be reduced when the document is conveyed. Further, since the relative positions of the pressure plate and the separating portion can be adjusted by the ribs, the respective positions can be arbitrarily changed. Further, it is possible to provide the document table with an inclined surface that facilitates the transportation of the document due to the shape of the rib. (5) By setting the position of the rib slightly higher than the document entrance position, the document can be easily set without colliding with the document entrance. Further, it is possible to make the relative positions of the pressure plate and the separating portion rough. (6) Since the separation roller is located between the reading section for book originals and the reading section for sheet originals, the same white reference can be used for both book originals and sheet originals.
No matter which document is read, the movement distance is short and the operation can be started in a short time. Further, since the white reference can be provided on the upper surface of the contact glass, the white reference can be set accurately. (7) Since the member used as the white reference can be used as the guide plate, it is not necessary to use the sheet member for the white reference, and the number of parts can be reduced. (8) Since the member used as the white reference can be used as the marker of the book document, the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a reading device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a schematic configuration of a conventional reading device.

FIG. 3 is a perspective view showing an external appearance (when a book document is set) of the reading device according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration of a separation unit according to an embodiment of the present invention.

FIG. 5 is a diagram showing a document setting position in one embodiment of the present invention.

[Explanation of symbols]

1: Adhesion sensor, 2: Pressure plate, 3: Separation part, 4: White reference member, 5: Recording part, 6: Control part, 7: Power supply part, 8:
Separation roller, 9: conveyance roller, 10: conveyance roller, 1
1: pressure roller, 12: pressure plate, 13: pickup roller, 15: rib, 16: contact glass, 17: base, 18: cover, 20: document guide, 30: book document, 40: sheet document.

Claims (8)

[Claims] 1. A reading device having a means for reading a book original and a sheet original, and a means for separating a plurality of sheet originals, wherein the sheet original separating means and the pressure plate for pressing the book original are arranged separately. Characteristic reading device. 2. The reading device according to claim 1, wherein the separating means is fixed to the main body of the apparatus, and the pressure plate can be opened and closed independently. 3. The reading apparatus according to claim 1, wherein when the sheet original is read, the original is set on the upper surface of the pressure plate. 4. The reading device according to claim 1, wherein a rib is provided on an upper surface of the pressure plate. 5. The reading device according to claim 4, wherein the rib is configured to be set at a position higher than a lower surface of the document guide of the separating means in a state where the pressure plate is closed. 6. The reading device according to claim 1, wherein a member serving as a white reference is provided below the separation roller of the separation means. 7. The reading device according to claim 6, wherein a guide plate for conveying the sheet original is provided on a surface of the member different from a surface used as a white reference. 8. The reading apparatus according to claim 6, wherein a marker for setting a book document is provided on a part of the member.