JP2002165059A - Original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an original reader that prevents foreign matters such as paper powder separated from an original at an ADF(Automatic Document Feeder) provided with an original carrying path directed laterally whose cross section is almost U-shaped from depositing onto a mirror or the like of a scanner thereby avoiding read information from having a defect. SOLUTION: A groove 37 burrowed into a paper guide 36 between an ADF platen glass pane 4 and the paper guide 36 is provided to a read section 22 between read rollers 33, 34 of the ADF to prevent paper powder or the like separated from the original from falling down. The groove 37 is integrally formed with the paper guide, contains the foreign matters such as the paper powder, and is cleaned up for an optional time by removing the ADF platen glass 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading device for an electrophotographic copying machine or a facsimile machine, which is provided on an ADF for reading an image of a document to prevent paper dust and the like falling from the document from adhering to the scanning device. To a device that

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a facsimile machine or a copying machine, a reading device for reading an image of a document is provided in combination with an image forming unit having a function of making a copy. In the reading device, in addition to transmitting information obtained by reading an image of a document to the image forming unit and using the information as copy creation information, using a facsimile function, image information is transmitted to a destination facsimile device. Use it to send. In the reading device, an original of a book is set on a platen glass, and an FBS (flat bed scanner) of a method of reading while moving the scanning device on the lower surface thereof, and the scanning device is fixed below the ADF platen glass. In addition, an ADF (automatic document feeder) for reading a moving document is used. Combining the above two types of scanner mechanisms so as to be able to read both book and sheet originals is provided in many reading apparatuses.

In the ADF, a document tray and a discharge tray are vertically arranged, and a horizontal U-shaped document transport path is provided between the two trays. A platen glass for ADF is provided, and a reading unit for reading with the scanning device fixed is provided. In the reading unit provided in the ADF, the document is conveyed by sliding the image surface of the document with respect to the ADF platen glass, and light is emitted from a scanning device disposed below the document,
Light is reflected by using a large number of mirrors and the like, and optical information focused by a lens is output as a digital signal from a CCD (charge coupled device).

[0004]

The manuscript to be read by using the ADF includes a manuscript corrected by a pencil or a pencil, a manuscript surface coated with a correction liquid, and an eraser residue attached thereto. As-is and the like may be used. In addition, depending on the type of paper, there is a powdery material contained in paper that has a property of being easily separated. Documents in which powdery substances (paper powder) or the like attached to the document are easily separated are portions that slide on the ADF platen glass.
The bending action on the original is strongly imparted, and
Sliding the DF platen glass increases the amount of paper powder separated.

Further, since the reading section of the ADF is provided at a lower portion of the curved path, paper powder and the like separated by sliding on a guide plate or the like when conveyed on the document conveying path can be removed. There is a problem that it is collected on the platen glass part.
Then, paper powder and the like separated from the document adhere to the platen glass and stain the reading surface, which may affect the image quality of the read image. Further, when paper dust or the like separated from the document falls from the gap between the platen glass and the support member and adheres to a mirror or the like of the scanning device, the read image information includes dirt information, and the image quality is reduced. A serious problem of deterioration occurs.

SUMMARY OF THE INVENTION The present invention is to solve the problem of a stain on a read image due to the adhesion of paper dust to an ADF, and provides a means for preventing paper dust and the like from dropping below the ADF platen glass. It is intended to provide.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a document reading apparatus for reading a document fed one by one from a document tray while passing it through a reading unit. The invention according to claim 1 of the present invention is characterized in that a paper dust falling prevention member is disposed on a support member for supporting the platen glass of the reading unit.
Therefore, the paper powder separated from the original is
Since it is possible to prevent the F platen glass from falling from the gap, clear image information can be obtained without adversely affecting the read image.

According to a second aspect of the present invention, a recess is provided in a supporting member that supports the platen glass of the reading section at a downstream portion in a document conveying direction. Since the paper dust can be collectively stored at the end of the ADF platen glass, it is possible to prevent the paper dust from dropping and adhering to the scanning device, and to prevent an adverse effect due to a dirty mirror or the like. Become.

According to a third aspect of the present invention, a film member is disposed between the reading unit and a supporting member that supports the platen glass of the reading unit at a downstream portion in the document conveying direction. And, by the film member closing the gap, it is possible to more effectively prevent the paper powder from dropping below the ADF platen glass.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an image reading apparatus of the present invention will be described with reference to the illustrated example. First, the configuration of an ADF incorporating a sheet conveying apparatus of the present invention will be described with reference to FIGS.
It is explained according to. The illustrated image reading device 1 has an F
The main frame 2 includes a platen glass 3 corresponding to a BS (flatbed scanner) function and an ADF platen glass 4 corresponding to an ADF (automatic document feeder) function.
, And a movable scanner device 5 is provided inside the main body frame 2. When the scanner device 5 is used in correspondence with the FBS, an image of a document set on the ADF platen glass 4 is read while moving at a constant speed by a driving unit (not shown). When the ADF function is used, the scanner device 5 is fixed at a position indicated by a virtual line in the figure, and an image of a conveyed document is read using the ADF function.

The scanner device 5 includes a lamp 6 for irradiating the image surface of the document, a plurality of mirrors m1 to m4,
A lens 7 for forming an image of light on a CD 8 is provided, and the CCD 8 converts a light signal into a digital signal and transmits the signal to an image signal processing means of an image reading apparatus. The image signal transmitted to the image reading device is used as an image writing signal for a photoreceptor in a recording unit of a copying machine, and in the case of an image forming device having a facsimile function, the image signal is transmitted through a telephone line. It is also possible to transmit to a facsimile machine.

A platen cover 10 and an ADF device 20 are integrally combined on the upper part of the main body frame 2 and provided so as to be openable and closable via a hinge portion (not shown) arranged at a rear end of the main body frame. I have. And the FB
When the S function is used, an original is set on the platen glass 3 and pressed by the elastic body 11 of the platen cover 10 so that the image surface is brought into close contact with the platen glass 3 to read an image. A discharge tray 13 is disposed on the upper surface of the platen cover 10, and a document tray 12 is provided above the discharge tray 13. The discharge tray 13 and the document tray 12 are provided corresponding to the ADF device 20. ing. The ADF device 20 has a substantially U-shaped conveyance path extending in a horizontal direction from a document insertion port 14 connected to the document tray 12, and a document conveyance path 21 reaching the ADF platen glass 4 and a reading unit 22. A discharge path 24 leading to the discharge tray 13 is provided, and a roller device for transporting the document in the document transport path is provided.

[0013] The roller device arranged in the document conveying path includes:
Pickup roller 3 arranged with respect to document insertion port 14
0 and sheet separating device 31, transport roller device 32 and A
The DF platen glass 4 includes two reading roller devices 33 and 34 arranged at the upstream and downstream portions, and a discharge roller device 35 provided at a discharge port. Then, the original is taken in from the original tray 12 by the pickup roller 30, the sheet is separated by the sheet separating device 31, and the separated original is sent to the original conveying path. In the document conveying path 21, the document is conveyed toward a reading roller device 33 by a conveying roller device 32, and the document is conveyed at a constant speed to a reading roller device 34 disposed downstream of the ADF platen glass 4. While platen glass 4 for ADF
The image is read by the scanner device 5 fixed at the position. The read original is sent to the discharge roller device 35 by the reading roller device 34 and discharged to the discharge tray 13 by the discharge roller device 35.

The ADF device 20 has an upper frame 25 which can be opened and closed via a hinge 27 provided on an upper portion of the frame 2 of the image reading device.
5, a cover member 26 is provided. In addition, A
In the substantially U-shaped transport path provided in the DF device 20, the inner frame 28 disposed inside the transport path is also provided so as to be swingable about a support shaft (not shown). When a paper jam or the like occurs in the reading unit 22 or the discharge path 24,
The upper frame 25 and the inner frame 28 are opened to perform maintenance work. Of the transport paths, the document transport path 21 includes a guide plate 25 a provided on the upper frame 25 and a guide surface 2 on the outer surface of the inner frame 28.
The document is guided by the reading unit 22 toward the reading unit 22.

In the reading section 22, the document pressing section 23 for sliding the back side of the document is connected to the ADF platen glass 4.
And guides the document conveyed by the reading roller devices 33 and 34 to the document pressing portion 23 while sliding the document. Then, an image on the document is read by a scanning device fixed to the lower surface of the ADF platen glass 4. In the reading unit 22,
On the upstream side of the ADF platen glass 4 in the document transport direction, the document is supported using a support member protruding from the frame,
Since the downstream side is supported by the paper guide 36 and the end of the glass and the supporting surface of the paper guide cannot be in close contact with each other, the paper guide 36 and the ADF
A slight gap is formed between the platen glasses 4 for use.

However, since a bending action and a sliding action are applied when passing through the curved document conveying path, the residue of the eraser adhered to the document conveyed in the document conveying path 21 and other debris, There is a problem that powdery deposits are easily separated. On the other hand, since the reading section 22 is located below the curved section of the document conveying path 21, the paper dust and other powder-like foreign matters separated from the document on the curved path are removed by the reading section 22. 22, it may fall from the gap between the ADF platen glass 4 and the paper guide 36 and adhere to a mirror or the like of the scanner device 5, which may hinder light reflection by the mirror.

In this embodiment, as shown in FIG. 3, a groove 37 dug into the paper guide is provided in a gap between the paper guide 36 and the platen glass 4 for ADF. Further, powder foreign matter such as paper powder separated from the original is accommodated in the groove 37. Further, in the paper guide 36, AD
The downstream end of the platen glass 4 for F is received and positioned by the support surface 36a, and the projection 36b supports the lower surface of the platen glass.
6b is not formed with a large gap.
Therefore, as shown in FIG.
Even if powdery foreign matter falls between the ADF platen glass 4 and the ADF 6, the foreign matter is stored in the groove 37 so that it does not fall below the ADF platen glass 4,
It is possible to prevent a problem that a foreign substance adheres to a mirror or the like of the scanner device 5. In addition, as described above, when foreign matter is stored in the groove 37, if the ADF platen glass 4 is removed when performing maintenance of the apparatus, the paper guide 36 is exposed.
Foreign matter can be removed from the groove 37 using a brush or the like.

The example shown in FIG. 4 shows an example in which a gap is not formed between the ADF platen glass 4 and the paper guide 36 by using a sheet-like sealing member 38 attached to the paper guide 36. I have. The sealing member 38 is made of a thin and stiff plastic film, and is adhered to the oblique surface 36c formed at the tip of the paper guide 36, and the tip is directed toward the lower surface of the platen glass 4 for ADF. The sealing member 38 is attached so as to press the tip of the sealing member 38 against the ADF platen glass 4 from below.
Therefore, even if the original sliding on the ADF platen glass 4 drops foreign matter such as paper dust to the connection portion with the paper guide 36 in the reading unit 22, the paper guide 36 and the ADF platen glass 4 Can be held between the paper guide 36 and the sealing member 38, so that it is sufficient to remove the foreign matter at any time.

FIG. 5 shows the groove 37 shown in FIG.
5 shows an example in which the sealing member 38 shown in FIG. 4 is arranged in combination, so that foreign matter can be more favorably dropped onto the lower surface of the platen glass. In this embodiment, the groove 37 provided in the paper guide 36 can be formed as a concave portion or a groove having an arbitrary shape.
Surface 36a and projection 36 corresponding to platen glass 4 for use
b can be configured in the same manner as in FIG. Also, the sealing member 3
The oblique surface 36c for pasting 8 can be an inclined surface formed at an arbitrary angle as in FIG. As shown in FIG. 6, when two types of foreign matter drop prevention means are provided, a very fine powdery material such as pencil shavings written on an original or clay used as a filler for paper is used. It is also possible to easily prevent foreign substances and the like from dropping into the scanner device. Then, the fine powdery foreign matter separated from the manuscript falls to the lower surface of the ADF platen glass 4 and adversely affects the optical system of the scanner device or stains the lower surface of the ADF platen glass 4. Can be prevented.

[0020]

Since the apparatus according to the present invention is constructed as described above, the paper dust falling prevention member is disposed on the supporting member for supporting the platen glass of the reading section, so that the paper dust separated from the original can be obtained. However, it is possible to prevent falling from a gap between the support member and the platen glass for ADF, so that clear image information can be obtained without adversely affecting the read image. In addition, a supporting member supporting the platen glass of the reading unit of the ADF at a downstream portion in the document conveying direction,
Since the concave portion is provided, the paper dust can be collectively stored at the end of the ADF platen glass, so that the paper dust can be prevented from dropping and adhering to the scanning device, and an adverse effect due to contamination of the mirror and the like can be prevented. Can be prevented. Further, by arranging a film member between the reading unit and a supporting member that supports the platen glass of the reading unit at a downstream portion in the document conveying direction, the film member closes a gap, and thus the ADF platen is closed. It is possible to more effectively prevent the paper powder from dropping below the glass.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of an image reading device.

FIG. 2 is an explanatory diagram illustrating a configuration of an ADF provided in the image reading apparatus.

FIG. 3 is an explanatory diagram of a configuration of a reading unit.

FIG. 4 is an explanatory diagram of another configuration of the reading unit.

FIG. 5 is an explanatory diagram of another configuration of the reading unit.

[Explanation of symbols]

1 image reading device, 2 frames, 3/4
Platen glass, 5 Scanner device, 6 Lamp, 7 Lens, 8 CCD, 10 Platen cover, 11 Elastic body, 12 Document tray,
13 output tray, 14 document insertion slot, 20
ADF, 21 document feed path, 22 reading unit,
23 original pressing section, 24 discharge path, 25 upper frame, 26 cover member, 27 hinge,
28 inner frame, 30 pickup roller, 31 paper separating device, 32 transport roller device, 33/34 reading roller device, 35 discharge roller device, 36 paper guide, 37 groove portion,
38 sealing member.

Claims (3)

[Claims] 1. A document reading apparatus for reading a document which is fed one by one from a document tray one by one while passing through a reading unit, wherein a paper member is prevented from falling to a supporting member supporting a platen glass of the reading unit. An original reading device, wherein members are arranged. 2. A document reading apparatus which reads a document separated and fed one by one from a document tray while passing through a reading unit, wherein a platen glass of the reading unit is located at a downstream portion in a document conveying direction. A document reading device, wherein a recess is provided in a supporting member that supports the document. 3. The image forming apparatus according to claim 1, wherein a film member is arranged between the reading unit and a supporting member that supports a platen glass of the reading unit at a downstream portion in a document conveying direction. Original reading device.