JPH11289428A - Image reader and image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pass an original while being in close contact with a read position and to eliminate static electricity. SOLUTION: The image reader is provided with a close contact image sensor 1 that reads image information of a carried original, a reading white board 12 that presses the original carried to a read line 4 of the close contact image sensor 1 to the read line 4, and a weight shaft 16 that energizes the reading white board 12 onto the read line of the close contact image sensor 1, and also with slits 19, 20 that respectively are extended in an original carrying direction toward an upper-stream and downstream of the reading white board 12 in the carrying direction with respect to the read line 4 and with an anti- electricity brush at a rear side of the slit 19 of the reading white board 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus for reading image information of a document while conveying the document, and an image processing apparatus provided with the image reading apparatus.

[0002]

2. Description of the Related Art Conventionally, in an image reading apparatus used for an image processing apparatus such as a facsimile apparatus, for example, as described in Japanese Patent Publication No. 7-90942, a flexible pressing member for pressing an original is used. In some cases, a sheet is used, and a reading reference sheet is stacked on the back surface. Further, as described in JP-A-6-268826, there is an apparatus using an antistatic resin as a reading reference. Further, as disclosed in Japanese Patent Application Laid-Open No. 7-58906, there is a type in which a pressing member for pressing a document is provided at a front end and a rear end of a reading reference, and a discharging brush is used as the pressing member.

[0003]

In recent years, there has been a demand for an image reading apparatus which uses a close contact type image sensor and conveys a document at a high speed in order to achieve both miniaturization of the apparatus and high-speed reading. As a result, the generation of static electricity due to the conveyance of the document tends to increase.

[0004] Further, the depth of focus of the contact type image sensor becomes shallower with the improvement of the reading resolution, and the disturbance of the document conveyance tends to affect the image. Therefore, the document is placed on the reading line (reading position) of the contact type image sensor. The necessity of passing while making them adhere to each other is increasing.

[0005] Further, as the document transport guide of the apparatus is made of resin, frictional charging due to friction between the guide and the document is increasing.

As a result, a problem is apt to occur, such as a problem that a static electricity attracts a document to a guide.

In such a situation, the above-described conventional example has the following problems. For example, 7-90
In the apparatus described in Japanese Patent Application Laid-Open No. 942, the document is pressed against the reading line by the pressing member, so that the document can be in close contact with the document, but static electricity tends to be generated.

In the apparatus described in Japanese Patent Application Laid-Open No. 6-268826, there is an effect of suppressing the generation of static electricity by the antistatic resin. In some cases, it is difficult to form a document so that it can be in close contact with the reading line due to a problem such as warpage that occurs. Also, since the types of resins that can be used are limited,
The performance of the desired reading standard is not always obtained.

Further, in the device described in Japanese Patent Application Laid-Open No. 7-58906, when a static elimination brush is used as a pressure contact member, the pressure contact force is determined by the elasticity of the static elimination brush. When the original is pressed strongly, the static elimination brush is generally made by arranging a large number of carbon fibers and fine stainless steel wires that are harder than normal paper. Occurs, and may adversely affect the read image.

SUMMARY OF THE INVENTION It is an object of the present invention to pass a document while closely contacting a reading position and to remove static electricity.

[0011]

A typical configuration of the present invention for achieving the above object is a document transport means for transporting a document, and reading image information of the document transported by the document transport means. Reading means, a pressing member serving as a reading reference for pressing the document conveyed to the reading position of the reading means by the document conveying means to the reading position, and a biasing member for urging the pressing member to the reading position of the reading means And a slit extending in the document conveying direction on one or both of the upstream and downstream sides of the reading position of the pressing member, and a static elimination member disposed behind the slit of the pressing member. It is characterized by having done.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an image reading apparatus and an image processing apparatus to which the present invention is applied will be specifically described below with reference to the drawings. In the following description, a facsimile apparatus as an image processing apparatus having an image reading apparatus to which the present invention is applied will be described as an example.

[First Embodiment] A facsimile apparatus as an image processing apparatus provided with an image reading apparatus according to a first embodiment will be described with reference to the drawings.

First, an outline of a facsimile apparatus to which the present invention is applied will be described with reference to FIGS. FIG.
Is a schematic sectional view showing a schematic configuration of the facsimile apparatus, and FIG. 5 is an external perspective view of the facsimile apparatus.

4 and 5, reference numeral 101 denotes an apparatus main body;
Reference numeral 102 denotes a document table configured to stack a plurality of documents S on the top cover of the apparatus main body 101; 103, an image reading unit that reads image information of the document S; 104, an image using an electrophotographic method. Recording section, 105 is document transport section, 106
Is a document pressing section, 1 is a contact type image sensor, 108 is a document discharge tray, 109 is a laser scanner, 110 is an image forming section, 111 is a front cassette section, 112 is a recording paper discharge tray, and 113 is an MP (multi-paper). ) Cassette unit, 114 is a cartridge cover, 115 is an ADF (auto document feeder) cover, 11 is an upper document guide, 9 and 10 are lower document guides, 118 is a cassette feeding unit, 119 is a front cassette, and 120 is an image reading unit. A partition unit 103 for the image recording unit 104, a control unit 121 of the facsimile machine (consisting of a recording system control unit and an image reading system and a communication system control unit (not shown) housed at the rear of the apparatus), and a handset 122 123 is a conveyance guide, 124 is an operation unit, 125 is a display unit, 126 is a tally lamp indicating the operation status of the facsimile machine, 127 is a second cassette unit, 128 is a light cover, and 129 is an MP cassette. Tosensa unit, 130 is a MP separation unit.

The image reading section 103 operates as follows.

First, the original S loaded on the original placing table 102 is transported by the preliminary transport solenoid 105c to the preliminary transport rollers 105b.
Is rotated, pressed against the preliminary transport pressing piece 105a, and pulled out. Next, a separation roller 105e pressed against the reverse rotation roller 105d.
To separate them one by one (reverse roller separation method). Next, the paper feed roller 105f is conveyed to the contact image sensor 1 by the paper feed roller 105g pressed against the original, and the original S is sent to the contact image sensor 1 by the weight pressing shaft 16 and the read white background 12 by the original pressing portion 106 described later. The image information of the document S is read while being pressed and brought into close contact. Next, the document S is discharged by a discharge roller pressed against a discharge roller 105 h.
The document is discharged to the document discharge tray 108 by 105i. During this time, the original S is guided by the upper original guide 11 and the lower original guides 9 and 10.

The document table 102 is provided with a slider 102a slidable in a direction (width direction of the document S) perpendicular to the conveying direction of the document S, and is mounted on the document table 102 by the slider 102a. The both sides of the original S can be aligned. When the document S is a long document, by opening the auxiliary tray 102b, it is possible to prevent the rear end of the document S from protruding from the document table 102 and hanging down.

The image recording unit 104 emits a modulation signal from a laser beam oscillator 109a of a laser scanner 109 based on the image signal output from the control unit 121, and scans this modulation beam with a rotating polygon mirror 109b. Then, the light is reflected by the return mirror 109c, and the photosensitive drum 110a of the image forming section 110 is irradiated with the scanning light, and the photosensitive drum 110a is irradiated with the scanning light.
110a Form image information on the surface,
The image information is transferred and fixed to the recording paper P fed from the first or second cassette unit 127 or the MP cassette unit 113 to the image forming unit 110, and then discharged to the recording paper discharge tray 112. Have been.

The photosensitive drum 110a is integrally incorporated in a recording cartridge 110e together with a primary charger 110b, a developing sleeve 110c and a cleaning blade 110d, and is configured to be detachable from the apparatus main body 101. ing.
The surface of the photoreceptor drum 110a is uniformly charged by the primary charger 110b. When the surface is irradiated with scanning light, a latent image is formed, and the latent image is developed by toner supplied from the developing sleeve 110c. It is intended to be imaged.

A transfer charger 110f is arranged around the photosensitive drum 110a of the image forming section 110.
A fixing device 110 is provided on the recording paper transport path downstream of 110a.
g, and a paper discharge roller 110h.

After the toner image formed on the surface of the photosensitive drum 110a is transferred to the recording paper P by the transfer charger 110f, the recording paper P is transported along the transport guide 123, and the toner image is fixed by the fixing device 110g. The recording paper is then discharged to a recording paper discharge tray 112 by a paper discharge roller 110h.

The MP cassette unit 113 is disposed below the image recording unit 104. The recording paper P loaded on the MP cassette 113a is pressed by the press contact member 113b to rotate the MP middle plate 113c upward, so that the MP separation roller 130a is rotated.
, And are separated one by one by a MP separation pad 130b pressed against the MP separation roller 130a (friction piece separation method), conveyed along an MP separation base 130c, and further conveyed by a conveyance roller 128. a, a cover-side U-turn guide 128 b disposed on the light cover 128,
It is inverted by the main body side U-turn guide 128c arranged on the 101 side.

Further, the recording paper P being fed is supplied to the top sensor 128.
d, the leading end position is detected, the sheet is fed so that the leading end of the toner image formed on the photosensitive drum 110a coincides with the leading end of the recording paper P, and the image output timing is adjusted. It is transported between the body drum 110a.
The image is recorded on the lower surface of the recording paper P stacked on the MP cassette 113a.

The side edge and the rear edge of the recording paper P are regulated by an MP regulating plate 113d movably mounted in accordance with the recording paper size. The size and presence or absence of the recording paper P are detected by the MP cassette sensor unit 129.
The number of sheets that can be loaded on the recording paper is about 100, and is configured to be pulled out toward the left side of the apparatus main body 101 (side loading method). In addition, there are three types of movable recording paper sizes: A4, letter, and legal. In FIG. 4, the MP regulating plate 113d is set to letter size.

The front cassette unit 111 includes the image recording unit 10
The top plate 111d of the front cassette unit 111 is disposed so as to be in contact with the bottom of 4 and the top surface of the top plate 111d is the bottom plate of the image recording unit 104. Reference numeral 111f denotes a bottom plate of the front cassette unit 111.

The recording paper P loaded on the middle plate 119b rotatably disposed on the front cassette holder 119a receives the recording paper P from the middle plate 119b.
b is urged upward by an intermediate plate spring 119c, and a pair of semicircular paper feed rollers 118a, a pair of separation claws 119d, a feed roller 118b that rotates normally, and a torque limiter (not shown). The sheet is separated one by one by a retard roller 118d that is driven to rotate in reverse (claw + reverse roller separation method).
The separated recording paper P is fed to a cassette transport roller pair 118e.
And the MP separation base 130c and the paper passing guide 12
8e, a conveying roller 128a, a cover-side U-turn guide 128b disposed on the light cover 128,
It is inverted by the main unit side U-turn guide 128c on the device main unit 101 side. From here on, it is the same as the sheet feeding from the MP cassette unit 113 described above. The paper paths merge immediately before the transport roller 128a. The image is recorded on the lower surface side of the recording paper P loaded on the front cassette holder 119a.

The retard roller 118d is provided on a retard roller holder 118f that is pivotally supported so as to be swingable.
The feed roller 118b is urged by a cassette separation lever 119g disposed on the front cassette holder 119a.

The recording paper P has its side and rear end surfaces regulated by a side regulating plate 119e and a rear end regulating plate 119f. The side end surface of the recording paper P is urged in the direction of the side regulating plate 119e by a spring-urged side pressure plate (not shown) disposed on the side facing the side regulating plate 119e. The size of the recording paper P is detected by a front cassette size sensor (not shown) which detects a size detection frame (not shown) provided on the front cassette holder 119a. The presence or absence of the recording paper P
Is directly detected by the front cassette paper presence sensor 111b. Further, in order to prevent the last sheet of the recording sheet P from being double fed, the sheet feeding roller 118 of the middle plate 119b is used.
A separation sheet 119j is attached at a position corresponding to a. 119k is a cassette cover which forms the exterior of the front cassette 119.

Each of the cassette units 111 and 127 has about 500
Sheets of recording paper P can be stacked, and are configured to be pulled out in front of the apparatus main body 101 (front loading method). The size of the recording paper that can be loaded is A4 or Letter,
Switching is possible by changing the mounting position of 119e and the rear end regulating plate 119f. In FIG. 4, the letter size is set.

Although the second-stage cassette unit 127 is omitted in FIG. 4, it has substantially the same configuration as the front cassette unit 111 shown in FIG. The paper is fed to the image recording unit 104 through the side space 111c of the image forming apparatus.

The second cassette unit 127 can be separated and combined as an option, and the number of recordable sheets of the entire apparatus can be changed to about 600 sheets and about 1100 sheets.

The main body 101 has a cartridge cover 114.
Is provided so that it can be opened and closed, and the cartridge cover 114
The recording cartridge 110e is opened by opening the
It can be pulled out of the 101 and replaced. Further, the cartridge cover 114 is provided with an interlock mechanism so that the image recording unit 104 does not operate when the cartridge cover 114 is open or the recording cartridge 110 e is not set in the apparatus main body 101. . Further, a drum shutter 110i provided on the recording cartridge 110e is an apparatus main body of the recording cartridge 110e.
The drum shutter 110i opens when the cartridge cover 114 is opened and the recording cartridge 110e is set in the apparatus main body 101, and when the recording cartridge 110e is removed from the apparatus main body 101. By closing the drum shutter 110i, unnecessary exposure or contamination of the photosensitive drum 110a is prevented.

If a jam occurs during recording, the cartridge cover 114, the light cover 128, the paper discharge cover 11
The recording paper P staying inside can be taken out by opening any one of 0j and the jam release cover 111e. Further, the paper discharge cover 110j needs to be opened after removing the recording paper discharge tray 112.

The partition unit 120 includes an image reading unit 103 and an image recording unit.
It is a duct that separates 104, this part and the fuser
An appropriate amount of air is supplied to the 110 g portion by a fan (not shown) disposed on the back side of the image recording unit 104, and the heat generated from the image recording unit 104 causes the image reading unit 10.
3 prevents the water vapor evaporating from the recording paper P from condensing and dropping on the recording paper P.

The contact type image sensor 1, which will be described in detail later with reference to FIG. 1, irradiates the image information surface of the original S with light from an LED array as a light source, and reflects the reflected light reflected from the image information surface into a cell. The image information is read by forming an image on the sensor element with a Fock lens (trademark).

FIG. 6 is a block diagram of the control system 300 of the facsimile machine. In the figure, reference numeral 301 denotes a CPU for controlling the entire facsimile apparatus, which is an MPU, a ROM for storing a control program for the MPU, an RA used as a work area for various data processing and a temporary storage for image information.
M, an image processing unit for performing image scaling, resolution conversion, and the like.

The CPU 301 is provided with a calendar, a clock function, and the like having a well-known configuration. An area of the RAM for storing important system setting information such as one-touch key destination information and software switch information is provided by a battery backup for power failure or the like. Protected from accidental disability. This protected RAM area may be constituted by an EEPROM (including a flash memory).

The control system 300 of the facsimile apparatus is the same as the C
The configuration is such that a PU 301 and the following elements 302 to 310 are connected through an interface.

The operation unit 302 includes various key switches such as a numeric keypad, a function key, a one-touch key, a start key, and a stop key. The display unit 303 includes an LCD for displaying various messages, various LEDs for displaying a transmission mode and the like, a tally lamp for notifying a distant operator of a communication state and occurrence of a failure, and the like.

The reading unit 304 includes a driving unit such as a reading motor, a reading sensor for reading an image, an image processing unit for shading and binarizing the read image, various sensors for detecting a document, and the like.

The recording unit 305 includes a driving unit such as a recording motor, a recording unit for controlling a laser scanner or an electrophotographic process, an image processing unit for performing smoothing of an image to be recorded, and various sensors for detecting recording paper and the like. Etc.

The communication control unit 306 for performing outgoing calls, incoming calls, encoding of image data, and the like has a connection unit composed of a MODEM, an NCU, and the like. The connection unit is connected to a communication network 307 and a handset 308. CPU external interface 309 is CPU
An interface for directly transmitting and receiving data from the device 301. The device is used as a scanner printer of an external computer by connecting to an external computer via a line such as RS232C, SCSI, LAN or the like. The HDD 310 is used as a large-capacity nonvolatile memory for storing image information and the like.

Next, the basic operation of the image recording section will be described with reference to FIG. In FIG. 7, reference numeral 400 denotes a semiconductor laser that flashes a laser beam for image data to be recorded, 401 denotes a polygon motor, and 402 denotes a polygon motor.
403 is an optical system that performs image formation, tilt correction, etc., 404 is a photodetector, 405 is a folding mirror, 406 is a photosensitive drum, 407 is a developing device, P is recording paper, 409 is a conveyance guide, and 410 Is a fixing device.

In the above configuration, first, a semiconductor laser
The laser light emitted from 400 is deflected by being reflected by a polygon mirror 402, and is irradiated onto a photosensitive drum 406 via an optical system 403 and a return mirror 405 (main scanning). At this time, the head is caught by the photodetector 404 and the irradiation position is determined. While the main scanning is completed for one line, the photosensitive drum 406 rotates one line (sub-scan). The image formed on the photosensitive drum 406 as described above is developed by the developing device 407 and is transferred onto the recording paper P. The sheet is further transported along the transport guide 409, and is
Settled at 410 and discharged.

Incidentally, the above-mentioned photosensitive drum 406, developing unit 407
The components of the sub-scanning system, such as the fixing device 410, are synchronously driven by a recording motor, gears, belts and the like (not shown).

Next, the image reading unit 103 to which the present invention is applied will be described in detail with reference to FIGS. FIG. 1 is an enlarged sectional view of a main part of the image reading unit 103 viewed from the front of the apparatus.
Is a cross-sectional view of the upper document guide 11 of the image reading unit 103 as viewed from below the apparatus.

1 and 2, reference numeral 1 denotes a contact image sensor which irradiates light from a LED array 2 to a reading line 4 at a reading position through a contact glass 3;
The light reflected from the image information surface of the original S on the reading line 4 is imaged on the sensor element 6 by the SELFOC lens 5 (trademark) to read the image information. The contact type image sensor 1 is fixed to a leader frame 8 by a mounting plate 7.
Reference numerals 9 and 10 are a lower document guide, 11 is an upper document guide, 12 is a read white background, 13 is a white background front guide, 14 is a white background rear guide, 15 is a reading reference sheet, 16 is a weight shaft, and 17 is a neutralizing member. A static elimination brush, 18 is a CS static elimination brush which is a second static elimination member;
Reference numeral 20 denotes a slit provided on the white reading background 12.

First, the document pressing section 106 will be described.
The reading white background 12 is a flexible white polyester film (about 110 μm thick in this embodiment). The reading white background 12 is bonded to a front white guide 13 and a rear white guide 14 made of galvanized steel at bonding portions 12a and 12b, respectively. Guide in front of white background
13 is fixed to the upper document guide 11 by a fixing screw (not shown). The white background rear guide 14 is attached in a manner guided by the upper document guide 11, and is movable in the vertical direction. The reading reference sheet 15 is a white synthetic paper, and is adhered to the back surface of the reading line 4 portion of the reading white background 12 by an adhesive portion 15a. The weight shaft 16 is a guide portion (not shown) of the upper document guide 11 and is attached so that both ends can move only in the vertical direction. The upper static elimination brush 17 is arranged on the back side of the reading white background 12,
The front end portion 17b is extended to the vicinity of the reading reference sheet 15 by being adhered to the white front guide 13 by an adhesive portion 17a. With this configuration, the document S transported between the lower document guide 9 and the upper document guide 11 is pressed against the contact glass 3.

Next, the slit provided on the white reading background 12 will be described. The slits 19 and 20 are formed before the reading white background 12 is bonded to other members. The formation is performed by pressing a sheet material. First, a double-sided tape serving as an adhesive is adhered to the adhesive portions 12a and 12b on the back surface of the white reading background 12 with the release paper attached. In this state, the slit shape is punched out from the reading surface side to the non-reading surface side by a press. In this embodiment, as shown in FIG. 2, the slits are provided on the upstream side (slit 19) and the downstream side (slit 20) of the reading line 4 in the transport direction. When processed as described above, since the double-sided tape is also punched with a slit-shaped hole, the adhesive does not remain in the slit after the release paper is removed, and there is no burr due to pressing on the reading surface side. Further, as shown in FIG. 2, since the slits 19 and 20 narrow the downstream side in the transport direction of the document S, it is difficult for the leading end of the document S to be caught at the portions exiting the slits 19 and 20.

Next, the removal of static electricity will be described. The static electricity on the back surface of the conveyed document S is supplied to the white front guide 13 by a slit 19 provided on the upstream side in the conveyance direction from the reading line 4.
And is removed by the white background rear guide 14 at the slit 20 provided on the downstream side in the transport direction from the reading line 4. Further, the static electricity on the surface of the document S is removed by a CS neutralization brush 18 provided at a position opposite to the slit 20 of the white reading background 12 via a document conveyance path. Further, since the slits 19 and the slits 20 are arranged at positions shifted in a direction orthogonal to the direction of transport of the document S, that is, since the slits 19 and the slits 20 are provided at positions that do not overlap in the direction of transport of the document S, A wide range of static elimination on the document S is enabled. Also, the upper static elimination brush
Reference numeral 17 is located at a position separated from the original S by the thickness of the white reading background 12, and the upper static elimination brush 17 does not rub the original S, so that paper dust is hardly generated, and the deterioration of the read image due to the paper dust is reduced. Can be suppressed. Also, slit 19 and slit 20
Is removed from the bonding portion 15a (reading reference effective portion) of the white reading background 12, so that it is possible to suppress the influence on the image due to static elimination. Further, the CS neutralizing brush 18 is provided with a slit 20.
Therefore, static electricity can be removed from both sides of the document S at the same time. The front white guide 13 and the rear white guide 18 are connected to a frame ground of the apparatus through a ground line (not shown) so that the removed static electricity does not accumulate.

It should be noted that a conductive member other than the charge removal brush may be attached to the back side of the slit 19 of the white reading background 12. The white reading background 12 is not limited to a polyester film as long as it is a flexible sheet material. The front white guide 13 and the rear white guide 14 may be plated with nickel or the like, or may be made of stainless steel according to the required conductivity.

As described above, according to the present embodiment, the slits 19 and 20 extending in the document conveying direction are provided on the upstream side and the downstream side of the read white background 12, and the slits 19 and 20 of the read white background 12 are provided on the back side. Since the static elimination brush 17 is provided, the original S can be passed through the reading line 4 while being in close contact with the reading line 4, and static electricity can be removed.

[Second Embodiment] Next, an image reading section according to a second embodiment will be described in detail with reference to FIG. FIG.
FIG. 3 is an enlarged sectional view of a main part of the image reading unit as viewed from the front of the apparatus. The description of the parts substantially the same as those in the first embodiment will be omitted.

In the above-described first embodiment, the pressing member for pressing the original to the reading line is made of a flexible sheet material (eg, a polyester film). In this embodiment, a white resin (eg, plastic) is injection-molded. At the same time, the above-mentioned slit is provided at the time of molding, and a static elimination member is provided on the back side. Also with this configuration, static electricity can be removed as in the first embodiment described above. Hereinafter, this configuration will be described in detail.

In FIG. 3, reference numeral 21 denotes an original pressing plate 21 as the above-mentioned pressing member, which is rotatable around a rotation center 21a, and prevents a stopper 21b from coming off. The document pressing plate 21 presses the document S by its own weight. Original pressing plate
The portion corresponding to the 21 reading line 4 (central portion 21c) is thicker to prevent the light emitted from the LED array 2 from transmitting and making the white reference unstable. Further, in this case, there is no problem even if the thickness around the slit (upstream portion 21d, downstream portion 21e) described later is reduced, so that the upper discharging brush 22 which is the discharging member is moved to a position close to the surface of the document pressing plate 21. Can be arranged. Specifically, the thickness around the slit (upstream portion 21d, downstream portion 21e) is preferably about 0.8 to 1.5 mm, and the thickness corresponding to the reading line 4 (center portion 21c) is preferably about 2.0 to 3.5 mm. It is. If the required thickness cannot be ensured due to a problem in injection molding, a reading reference sheet may be stacked on the back surface as in the first embodiment. The material of the reading reference sheet is not limited to the white composite sheet.

A slit (not shown) similar to the slit 19 of the first embodiment is formed on the original pressing plate 21 on the upstream side of the reading line 4 in the transport direction. Further, the original pressing plate 21
The upper static elimination brush 22 is adhered to the back surface of the slit portion by an adhesive portion 22a. With this configuration, the document S can be passed through the reading line 4 while being in close contact with the reading line 4, and static electricity can be removed as in the first embodiment.

Further, according to the present embodiment, there is an advantage that the possibility of obtaining a desired reading reference performance is increased because the types of usable resins are increased.

In this embodiment, a conductive member other than the charge removal brush may be attached to the back side of the slit portion of the document pressing plate 21, or a slit may be provided downstream of the reading line 4 in the transport direction. No problem.

[Other Embodiments] In the above-described embodiment,
Although a facsimile apparatus is exemplified as the image processing apparatus, the present invention is not limited to this. For example, another image processing apparatus such as a scanner or a copying machine may be used, and an image reading apparatus used in the image processing apparatus may be used. Similar effects can be obtained by applying the present invention to the device.

Further, in the above-described embodiment, the electrophotographic method is exemplified as the recording method. However, the recording method is not limited to this, and another recording method such as an ink jet method may be used.

[0062]

As described above, according to the present invention, the pressing member for pressing the conveyed document to the reading position extends in the document conveying direction to one or both of the upstream side and the downstream side of the reading position. Since the slit is provided and the static elimination member is disposed behind the slit of the pressing member, the original can be passed while closely adhering to the reading position, and static electricity can be removed.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of an image reading unit according to a first embodiment as viewed from the front of the apparatus.

FIG. 2 is a cross-sectional view of the upper document guide of the image reading unit according to the first embodiment as viewed from below the apparatus.

FIG. 3 is an enlarged cross-sectional view of a main part of an image reading unit according to a second embodiment as viewed from the front of the apparatus.

FIG. 4 is a schematic sectional view showing a schematic configuration of a facsimile apparatus to which the present invention is applied.

FIG. 5 is an external perspective view of a facsimile apparatus to which the present invention is applied.

FIG. 6 is a block diagram of a control system of the facsimile apparatus to which the present invention is applied.

FIG. 7 is a conceptual diagram of a basic operation of the LBP.

[Explanation of symbols]

 P: Recording paper S: Document 1: Contact image sensor 2: LED array 3: Contact glass 4: Read line 5: Selfoc lens 6: Sensor element 7: Mounting plate 8: Leader frame 9, 10: Lower document guide 11 … Top document guide 12… Reading white background 12a, 12b… Adhesive part 13… White background front guide 14… White background rear guide 15… Reading reference sheet 15a… Adhesive part 16… Weight axis 17… Upper static eliminating brush 17a Part 18: CS neutralizing brushes 19, 20 Slit 21 Document original plate 21a Rotation center 21b Stopper 21c Central part 21d Upstream part 21e Downstream part 22 Upper neutralizing brush 22a Adhesive part 101 Device body 102 Document mounting table 102a Slider 102b Auxiliary tray 103 Image reading unit 104 Image recording unit 105 Document transport unit 105a Preliminary transport pressing piece 105b Preliminary transport roller 105c Preliminary transport Solenoid 105 d reverse roller 105 e separation roller 105 f paper feed roller 105 g paper feed roller 105 h paper discharge roller 105 i paper discharge roller 106 document pressing section 108 document discharge tray 109 laser scanner 109 a laser beam oscillator 109 b polygon mirror 109 c folding mirror 110 image forming unit 110 a photosensitive drum 110 b primary charger 110 c developing sleeve 110 d cleaning blade 110 e recording cartridge 110 f: transfer charger 110 g: fixing unit 110 h: discharge roller 110 i: drum shutter 110 j: discharge cover 111: front cassette 111b: front cassette paper presence / absence sensor 111c: side space 111d Top plate 111 e Jam release cover 111 f Bottom plate 112 Recording paper discharge tray 113 MP cassette unit 113 a MP cassette 113 b Pressure contact member 113 c Medium MP plate 113 d M Restriction plate 114… Cartridge cover 115… ADF cover 118… Cassette paper feed section 118 a… Paper feed roller 118 b… Feed roller 118 d… Retard roller 118 e a: Front cassette holder 119 b: Middle plate 119 c: Middle plate spring 119 d: Separating claw 119 e: Side regulating plate 119 f: Rear end regulating plate 119 g: Cassette separating lever 119 j: Separating sheet 119 k: Cassette cover 120 Partitioning unit 121 Control unit 122 Handset 123 Transport guide 124 Operation unit 125 Display unit 126 Tally lamp 127 Second cassette unit 128 Light cover 128 a Transport roller 128 b Cover-side U-turn Guide 128 c: Main unit side U-turn guide 128 d: Top sensor 128 e: Paper passing guide 129: MP cassette sensor unit 130: MP separation unit 130a: M Separation roller 130 b MP separation pad 130 c MP separation base 300 Control system 301 CPU 302 Operation section 303 Display section 304 Reading section 305 Recording section 306 Communication control section 307 Communication network 308 Handset 309 ... CPU external interface 310 ... HDD 400 ... Semiconductor laser 401 ... Polygon motor 402 ... Polygon mirror 403 ... Optical system 404 ... Photodetector 405 ... Folding mirror 406 ... Photoconductor drum 407 ... Developing device 409 ... Transport guide 410 ...

Claims (11)

[Claims] An original transporting means for transporting an original; reading means for reading image information of the original transported by the original transporting means; and an original transported by the original transporting means to a reading position of the reading means. A pressing member serving as a reading reference for pressing the reading member to the reading position, and an urging means for urging the pressing member to the reading position of the reading means, and an upstream or downstream side of the reading position of the pressing member. An image reading device, wherein a slit extending in the document conveying direction is provided in one or both of the above and a static elimination member is provided behind the slit of the pressing member. 2. The image reading apparatus according to claim 1, wherein the charge removing member is a member having higher conductivity than the pressing member. 3. The image reading apparatus according to claim 1, wherein the pressing member is a member made of a non-conductive material. 4. The image reading apparatus according to claim 1, wherein a second static elimination member is provided at a position facing a slit provided in the pressing member via the document conveyance path. 5. The image reading apparatus according to claim 1, wherein the pressing member is made of a flexible sheet material. 6. The image reading apparatus according to claim 5, wherein the slit is formed by punching the flexible sheet material from a reading side to a non-reading side. 7. A reading reference sheet is superposed on a position corresponding to the reading position on the back surface of the flexible sheet material, and the slit is provided in a portion where the reading reference sheet does not overlap. The image reading device according to claim 5, wherein 8. When a slit is provided on the upstream side and the downstream side of the reading position of the pressing member, the slit on the upstream side of the reading position and the slit on the downstream side of the reading position are arranged in a direction orthogonal to the document conveying direction. The image reading device according to claim 1, wherein the image reading device is provided at a shifted position. 9. The pressing member is made of injection-molded white resin, and a thickness of the pressing member at a position corresponding to the reading position is made thicker than a portion provided with the slit. The image reading device according to claim 1. 10. The image reading apparatus according to claim 1, wherein said reading means is a contact image sensor. 11. An image reading apparatus according to claim 1, further comprising: an image communication unit for transmitting an image read by the image reading apparatus to a communication line. Image processing device.