JPH1028205A - Image reader and image-forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of image defects by placing a rotor at a position shifted in the original feed direction from the point set right above an image-reading position and therefore preventing even an injured transparent member from affecting the images. SOLUTION: A scraper sheet 20 serving as a transparent member is placed between the image-reading position R of an original board glass 19 and a Sonosheet original which passes the position R. Then the sheet 20 guides the fed original. A white roller 21 serving as a rotor makes the original adhere or come close to the sheet 20 and the glass 19 and also prevents an out-of-focus state of the original image. For this purpose, the roller 21 is placed at a position shifted in the original feed direction from the point, set right above the position R. Specifically, the roller 21 is shifted to the upstream side of the oriental feed direction from the point, set right above the position R.

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 an image of a sheet-shaped document or a book-shaped document, and more particularly, to an image reading apparatus used in an image forming apparatus such as a facsimile machine and a copying machine. Things.

[0002]

2. Description of the Related Art Conventionally, an image reading apparatus used in an image forming apparatus such as a facsimile machine or a copying machine is arranged so that a sheet-shaped original is passed through a predetermined image reading position on an original platen glass by an automatic original feeding apparatus. A document reading mode for reading an image of the sheet-like document by the image reading system at the image reading position while conveying the sheet-like document or the book-like document in the image reading area on the platen glass. A stationary original reading mode in which an image reading system is placed and the image reading system reads an image of the original while moving the image reading area along the original on the platen glass. 8 and 9 show the configuration around the image reading position in this conventional image reading apparatus.
Shown in

[0003] In the apparatus shown in FIG. 8, a sheet-like document passing an image reading position 102 on a document table glass 101 is peeled off from the document table glass 101 and guided to a downstream conveyance path in a document reading mode. The peeling sheet 103 is slightly pressed downstream from the image reading position 102 in the transport direction.

However, when the leading edge of the sheet-like document rides on the peeling sheet 103 and separates from the platen glass 101, the leading edge of the sheet-like document falls on the peeling sheet 103.
There is a risk of jamming at the end of the sheet, jamming, or non-feeding. Alternatively, there is a problem in that a load is applied to the sheet-shaped document, and misalignment, bending, wrinkling, image blur, and the like are likely to occur.

Therefore, in the apparatus shown in FIG. 9, the release sheet 103 is disposed over a wide range from the upstream portion to the downstream portion in the transport direction via the image reading position 102, and the release sheet 103 is provided.
103 is formed of a transparent member. Further, a rotator 104 is disposed directly above the image reading position 102 for bringing the sheet-shaped document into close contact with or close to the transparent release sheet 103 and the document table glass 101 to prevent defocusing of an image. I have.

[0006]

However, in the above-described conventional configuration, the image is not out of focus, and the sheet-like original can be peeled off satisfactorily. Scratches occur when rubbed on 104 or sheet-shaped documents. And this transparent release sheet 10
Since the image of the sheet-shaped document is read through the step 3, the above-mentioned scratches on the transparent sheet adversely affect the read image, and there is a possibility that an image defect occurs.

Accordingly, an object of the present invention is to prevent a scratch on the transparent member from adversely affecting an image, and to cause image defects such as image blur and image reading unevenness due to fluttering around the image reading position of a sheet-shaped document. The purpose is to prevent

[0008]

In order to achieve the above object, a typical configuration of the present invention is such that a sheet-shaped document is passed through a predetermined image reading position on a document table glass by an automatic document feeder. A transport original reading mode in which the image of the sheet-like original is read by the image reading system at the image reading position while the sheet is being transported, and the sheet-like original or the book-like original is placed in the image reading area on the platen glass. A stationary original reading mode in which the image reading system reads an image of the original while the image reading system moves in an image reading area along the original on the original platen glass. A transparent member interposed between the image reading position and a sheet-shaped document passing through the image reading position and guiding the sheet-shaped document to be conveyed; and the transparent member and the document Has a rotating body is brought into close contact with or close to the glass, and is characterized in that the rotating body is arranged at a position shifted in the conveying direction from above of the image reading position.

In the above construction, since the rotating body is arranged at a position shifted from the position immediately above the image reading position in the transport direction, the scratches on the transparent member will not affect the image reading position where the rotating body is arranged. This occurs at a position deviated from the position, and does not occur at the image reading position. Therefore, even if the transparent member is scratched, the image is not adversely affected, and the occurrence of an image defect can be prevented.

Specifically, for example, by disposing the rotating body at a position shifted from immediately above the image reading position to the upstream side in the transport direction, the sheet-shaped document can be separated from the transparent member by the rotating body at the image reading position. Since the sheet-shaped document is constrained by being closely attached to or close to the platen glass, it is possible to prevent fluttering around the image reading position of the sheet-shaped document during conveyance, and to prevent image blur and image reading unevenness caused by the fluttering. Image defects can be prevented from occurring.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an image forming apparatus provided with an image reading apparatus to which the present invention is applied will be specifically described with reference to the drawings. In the following embodiment, a facsimile machine is exemplified as an image forming apparatus.

[First Embodiment] FIGS. 1 to 6 show a facsimile apparatus provided with an image reading apparatus according to a first embodiment.
This will be described with reference to FIG. FIG. 1 is an enlarged sectional view of the vicinity of an image reading position in the image reading apparatus according to the first embodiment, FIG. 2 is a sectional view of the image reading apparatus when the facsimile apparatus according to the first embodiment is viewed from the front, and FIG. FIG. 4 is a left side view (partially sectional view) of the entire facsimile machine, FIG. 5 is an external perspective view of the facsimile machine, and FIG. 6 is a view of the facsimile machine. It is a block diagram of a control part.

As for the order of the following description, first, the schematic configuration of the entire facsimile apparatus will be briefly described, and then the configuration of each section such as the image reading section, the recording apparatus main body, and the control section will be sequentially described. In the following description, a sheet-shaped document is referred to as a sheet document, and a book-shaped document is referred to as a book document.

First, the configuration of the entire facsimile apparatus according to the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a facsimile apparatus main body, which includes an image reading section 2 for reading image information of a sheet document, a recording apparatus main body 3 composed of a laser beam printer, an operation section 4 including a display section and input keys, and a facsimile apparatus. Control unit 5,
It comprises a partition 6 between the image reading section 2 and the recording apparatus main body 3 and the like.

The image reading section 2 is of a type in which a platen glass on which a sheet document or a book document is set is fixed, and the sheet document passes through a predetermined image reading position on the platen glass by an automatic document feeder. A transport original reading mode in which an image of the sheet-like original is read by an image reading system at the image reading position while the original is being transported, and a sheet original or a book original is statically placed in an image reading area on a platen glass. A stationary document reading mode for reading an image of the document while the image reading system moves in the image reading area along the document on the platen glass. Hereinafter, the image reading unit 2 will be described in detail.

In FIG. 1, reference numeral 11 denotes a document placing table on which a plurality of sheet documents can be placed. 11a
Reference numeral denotes a slider, which regulates the position of the sheet document placed on the document table 11 in the width direction. Reference numeral 11b denotes an extension tray, which is openably and closably attached to the document table 11, and can be extended in accordance with the length of the sheet document placed on the document table 11 in the transport direction. 11
Reference numeral c denotes a lifter, which is rotatably supported by a support shaft 11d of the document placing table 11, and which vertically moves a sheet document placed on the document placing table 11 and presses the sheet document against a separation roller. . A lifter spring 11e presses the lifter 11c upward.

Reference numeral 12 denotes a sheet document transport unit for sequentially feeding sheet documents set on the document table 11 one by one. 12b is a separation roller, and the lifter
The sheet original pressed by 11c is separated and fed one by one from the top. 12a is a separation pad,
It is arranged so as to face and contact the separation roller 12b, and separates sheet documents one by one in cooperation with the separation roller 12b. Reference numeral 13 denotes a separation pad holder, which is rotatably supported on a support shaft 13a and holds the separation pad 12a. Reference numeral 13b denotes a stopper which regulates the leading end position of the sheet document when the sheet document is set. 14
Denotes a separation spring, which presses the separation pad 12a together with the separation pad holder 13 against the separation roller 12b.

Reference numeral 12d denotes a conveying roller, and the separation roller
This is to convey one sheet document separated by the separation section formed by the separation pad 12a and the separation pad 12a to the downstream side in the conveyance direction. Numeral 12c denotes a conveying roller for nipping and conveying the sheet document in cooperation with the conveying roller 12b. Reference numeral 15 denotes an inner sheet guide, and 16 denotes an outer sheet guide. These two sheet guides 15 and 16 form a U-turn path to guide the conveyance of the sheet document.

A feeding roller 12f feeds the sheet document to an image reading position. Reference numeral 12e denotes a feeding roller for nipping and feeding a sheet document in cooperation with the feeding roller 12f.

Reference numeral 17 denotes an image sensor as reading means for reading an image of the sheet document. Reference numeral 18 denotes a carriage on which the image sensor 17 is mounted and moves in the direction of the arrow in the drawing or stops at a predetermined position. The image sensor 17 emits light from the LED array as a light source to the image information surface of the document, and forms the reflected light reflected from the image information surface on a sensor element by a selfoc lens (trademark) to form image information. To read.

Reference numeral 19 denotes an original platen glass. A sheet original passes through an image reading position on the original platen glass 19 in the transport original reading mode, and an image reading area on the original platen glass 19 in the stationary original reading mode. A sheet document or a book document is placed on the sheet. Reference numeral 20 denotes a scraper sheet as a transparent member, which is interposed between the image reading position of the platen glass 19 and the sheet document passing through the image reading position, and guides the conveyed sheet document. Reference numeral 21 denotes a white roller as a rotator, which brings the sheet document into close contact with or close to the scraper sheet 20 and the document table glass 19. Reference numeral 22 denotes a pressed white background sheet attached to a pressure plate (not shown), and a sheet document or a book document placed in the image reading area of the platen glass 19 is placed on the platen glass.
Press 19

Reference numeral 12h denotes a discharge roller, which conveys the sheet document from which the image has been read onto the discharge tray 23. Reference numeral 12g denotes a discharge roller, which pinches and conveys the sheet document in cooperation with the discharge roller 12h.

A sensor (DS) 24 detects the presence or absence of a sheet document and the width of the sheet document. Reference numerals 25 and 26 denote sensors (DWS) which detect the width of the sheet document and are attached according to the size of the sheet document. A sensor (DLS) 27 detects the length of the sheet document. 28 is a sensor (DES),
It detects the leading edge and the trailing edge of the sheet document. A sensor (BCVS) 29 detects the open / closed state of a pressure plate (not shown) provided with the white sheet 22.

The image reading section 2 is a sheet original transport section.
The upper unit 2a includes an upper unit 2a having an image sensor 17 and the like.
Are openable and closable with respect to the lower unit 2b.

Next, each reading mode of the image reading section 2 having the above configuration will be described. In the transport document reading mode of the image reading section 2, the sheet documents stacked on the document table 11 are separated one by one by a separation pad 12a and a separation roller 12b. The separated sheet original is transported to the outer sheet guide 16 and the inner sheet guide by the transport rollers 12c and the transport rollers 12d.
A U-turn path consisting of a part of 15 is transported. Further, the sheet document is sent to an image reading position by a feeding roller 12e and a feeding roller 12f. In the image reading position, the sheet original is scraped by the white roller 21 by the scraper sheet.
Image information is read by the image sensor 17 by being brought into close contact with or close to the platen glass 19 and the platen glass 19. At this time, the image sensor 17 is moved to the image reading position by the carriage 18 and stopped. Thereafter, the sheet document is scooped up from the platen glass 19 by the scraper sheet 20,
The sheet is discharged onto the discharge tray 23 by the discharge rollers 12g and the discharge rollers 12h. During this time, the sheet document is guided by a transport path formed by the outer sheet guide 16 and the inner sheet guide 15.

The document table 11 is provided with a slider 11a slidable in the width direction orthogonal to the sheet document conveying direction as described above, and is mounted on the document table 11 by the slider 11a. The both sides of the printed sheet document can be aligned. If the sheet document is long in the transport direction, opening the extension tray 11b can prevent the trailing end of the sheet document from protruding from the document table 11 and hanging down. Also, the width and length of the sheet document are set to DS24, DWS25,
LS27 detects the size of the sheet document.

Here, the vicinity of the image reading position will be described. As shown in FIG. 1, the sheet document is conveyed through the image reading position R in the directions of arrows S ₁ and S ₂ . Further, the scraper sheet 20 is provided in a wide range from the upstream side to the downstream side of the image reading position R in order to peel the sheet document from the document table glass 19. Also, the sheet original is brought into close contact with or close to the scraper sheet 20 and the original platen glass 19,
A white roller 21 for preventing the image of the sheet document from being out of focus is arranged at a position shifted from directly above the image reading position R in the transport direction. More specifically, in the present embodiment, the white roller 21 is disposed at a position shifted from immediately above the image reading position R to the upstream side in the transport direction.

According to the above construction, the scraper sheet
Since the reference numeral 20 is provided in a wide range from the upstream to the downstream in the transport direction via the image reading position R, the sheet document can be satisfactorily separated from the platen glass 19. Further, since the sheet original is brought into close contact with or close to the scraper sheet 20 and the original platen glass 19 by the white roller 21, the defocus of the image does not occur.

Further, since the white roller 21 is disposed on the upstream side in the conveying direction from immediately above the image reading position R, the scraper sheet 20 is rubbed by the white roller 21 and the sheet original at the image reading position R to cause damage. I will not do it. Further, at the image reading position R, the sheet document is tightly or closely held by the scraper sheet 20 and the document table glass 19 by the white roller 21 and is restrained, so that the occurrence of fluttering of the sheet document at the image reading position R is prevented. It is possible to prevent image defects such as image blur and image reading unevenness due to fluttering from occurring.

Here, according to the experiment of the inventor, the scratches caused by the white roller 21 of the scraper sheet 20 or the sheet original are caused by shifting the white roller 21 from the upper right of the image reading position R to the upstream side in the transport direction by 0.3 mm or more. It has been found that such a problem does not occur by arranging them at different positions.

If the amount of displacement of the white roller 21 from the image reading position R is large, the adhesion or proximity of the sheet document to the platen glass 19 by the white roller 21 is deteriorated, and the sheet document is There is a possibility that the image will be blurred due to floating from the glass 19, and the shift amount at which the image blur occurs will vary depending on the diameter of the white roller 21 and the depth of focus of the image sensor 17 as a reading unit. In light of these facts, the inventor conducted an experiment and found that the white roller 21
It is known that when the diameter of the white roller 21 is about 16 mm, the image blur does not occur if the shift amount of the white roller 21 from directly above the image reading position R is 1.0 mm or less.

In the stationary document reading mode of the image reading section 2, the image sensor 17 is moved by the carriage 18 to read the image of the sheet document or the book document set in the image reading area on the platen glass 19. .

Next, the recording apparatus main body 3 will be described in detail. The recording apparatus main unit 3 emits a modulation signal from a laser beam oscillator 30a of the laser scanner 30 based on the image signal output from the control unit 5, and this modulated beam is reflected by a polygon mirror 30b via a mirror 30c. The photosensitive drum 31a of the cassette 31 is irradiated with scanning light to form image information on the surface of the photosensitive drum 31a.
The image information is transferred and fixed to a sheet material such as a recording sheet fed from 32 to an image forming unit 31 and then conveyed to a sheet discharging unit 33.

The photosensitive drum 31a is integrally incorporated in a recording cartridge 31e together with a primary charger 31b, a developing roller 31c and a cleaning blade 31d, and is configured to be detachable from the apparatus main body 1. Then, the surface of the photosensitive drum 31a is uniformly charged by the primary charger 31b, and when the scanning light is reflected from the polygon mirror 30b by the return mirror 30c and irradiated on the surface, a latent image is formed, and the latent image is developed. The image is visualized by the toner supplied from the roller 31c.

A transfer charger 31f is arranged around the photosensitive drum 31a of the image forming section 31, and
A heat fixing device 31g and a discharge roller 31h are arranged on the sheet conveying path downstream of the position a.

The sheet material P such as the recording paper is transferred to a transfer charger.
After the toner image formed on the surface of the photosensitive drum 31a is transferred by 31f, the toner image is conveyed along the sheet conveying unit 34, the toner image is fixed by the heat fixing unit 31g, and is discharged to the sheet discharge unit 33 by the discharge roller 31h. It is being discharged.

The sheet conveying guide 34a of the sheet conveying section 34 has conveying belts 34b and 34c at the center in a V-shape, and conveys the sheet from the downstream of the photosensitive drum 31a to the heat fixing device 31g. And a sheet material shorter than the conveying path length of the photosensitive drum 31a and the heat fixing device 31g can be conveyed without disturbing the toner image.

The cassette feeding section 32 is provided at the bottom of the apparatus main body 1. The sheet loaded on the feeding cassette 32a is urged upward by the middle plate 32e by the middle plate spring 32f.
The sheet is separated one by one by a semicircular feed roller 32b and a separation claw (not shown) (claw separation method). The separated sheet material is transported by a pair of cassette transport rollers 32c, and a sheet transport inner guide 35c formed by a part of a main body frame forming a frame of the apparatus main body 1 and a cover-side U-turn guide disposed on a front cover 36. 35d and the main body side U-turn guide 35e arranged in the main body 1 of the apparatus. Further, the leading edge position of the sheet material being fed is detected by the registration sensor 35f, and the feeding / image output timing is adjusted so that the leading edge of the toner image formed on the photosensitive drum 31a and the leading edge of the sheet material coincide. Is transported between the transfer charger 31f and the photosensitive drum 31a.

In the feeding cassette 32a, a sheet regulating plate (not shown) which can move the sheet material according to the sheet size is mounted. The rear end face is regulated so that skewing and non-feeding do not occur. The image is recorded on the lower surface side of the sheet material stacked on the feeding cassette 32a. The size and presence or absence of the sheet material are detected by a cassette sensor (not shown). In the present embodiment, the number of sheets that can be stacked on the feeding cassette 32a is set to about 100, and the front side (rightward in FIG. 4) of the apparatus main body 1 where the operation unit 105 is provided. (Front loading method). Sheet sizes that can be stacked are A3 length, A4 width, A4 length, A
5 horizontal, B4 vertical, B5 horizontal, LDR vertical, LTR horizontal, LGL
There are 10 vertical and LTR vertical types.

Further, by removing the front cover 36, the MP
(Multi-paper) By attaching the tray 37, a postcard or a business card can be added to a sheet size that can be fed. In this embodiment, the number of sheets that can be stacked on the MP tray 37 is set to about 100 sheets.

The second to fourth cassette feeding sections 38 having the same configuration as the cassette feeding section 32 can be separated and connected as options. This allows
Approximately 350 to 1100 sheets can be loaded on the entire device
It is possible to change the number of sheets.

A cartridge cover 39 is provided on the apparatus main body 1 so as to be openable and closable. By opening the cartridge cover 39, the recording cartridge 31e can be pulled out of the apparatus main body 1 and replaced. The cartridge cover 39 is provided with an interlock mechanism (not shown).
When the recording cartridge 32e is not set in the apparatus main body 1, the recording apparatus main body 3 does not operate. The drum exposure prevention shutter 31i provided on the recording cartridge 31e is connected to the apparatus main body 1 of the recording cartridge 31e.
The cartridge is opened when the cartridge cover 39 is opened and the recording cartridge 31e is set in the apparatus main body 1, and is closed when the recording cartridge 31e is removed from the apparatus main body 1 to close the photosensitive drum 31a. It is designed to prevent unnecessary exposure.

When a jam occurs during recording,
Cartridge cover 39, front cover 36, discharge cover
By opening one of the sheets 40, the sheet material staying inside can be taken out.

The partitioning section 6 is a duct for separating the image reading section 2 from the main body 3 of the recording apparatus.
This prevents the image reading unit 2 from being adversely affected by the heat generated from the sheet, and prevents water vapor evaporated from the sheet material from condensing and dripping on the sheet material.

Next, the configuration of the control unit 5 of the facsimile apparatus embodying the present invention will be described with reference to the block diagram of FIG. The control unit 5 includes a reading unit 54, a recording unit 55, an operation unit 52, a communication control unit 56, an LCD (display unit) 53, a speaker 57, a CPU
(Central processing circuit) 51, MPU61, RAM63, ROM
62, an image processing unit 64.

A CP 51 controls the entire facsimile machine.
U, an MPU 61, a ROM 62 for storing a control program of the MPU 61, a RAM 63 used as a work area for various data processing and a temporary storage unit for image information, an image processing unit for performing image scaling, resolution conversion, etc. 64. The CPU 51 is provided with a calendar, a clock function, and the like having a known configuration, and an area for storing important system setting information such as one-touch key destination information and software switch information in the RAM 63 is provided by a battery backup so as to prevent a power failure or the like. Are protected from failure. The control unit 5 of the facsimile apparatus has the CPU 51 described above.
And the following elements 52 to 60 are connected via interfaces 58 and 59.

The reading unit 54 includes a driving unit such as a reading motor, a reading sensor (image sensor 17) for reading an image, an image processing unit for shading and binarizing the read image, and various sensors for detecting a document. (Sensors 24 to 29) and the like.

The recording unit 55 includes a driving unit such as a recording motor, a recording unit for controlling a laser scanner and 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 56 for performing outgoing calls, incoming calls, encoding of image data, and the like has a connection composed of MODEM, NCU, and the like, and a communication network and a handset are connected to the connection unit.

The external interface 59 is connected to a CPU
An interface for directly transmitting and receiving data from the device 51. The device is used as a scanner printer or the like of an external computer by connecting to a computer external to the device through a selection of, for example, RS232C, SCSI, LAN, or the like. The HDD 60 is used as a large-capacity nonvolatile memory for storing image information and the like.

[Second Embodiment] A facsimile apparatus provided with an image reading apparatus according to a second embodiment will be described with reference to FIG. FIG. 7 is an enlarged view near the image reading position. Since the schematic configuration of the entire apparatus is substantially the same as that of the above-described embodiment, members having the same functions and configurations are denoted by the same reference numerals, and detailed description is omitted.

In the above-described embodiment, the configuration in which the white roller 21 as a rotator for preventing defocusing of the sheet document is arranged on the upstream side in the transport direction from immediately above the image reading position R is illustrated. In the embodiment, the white roller 41 as the rotator is disposed on the downstream side in the transport direction from immediately above the image reading position R.

In such a configuration, since the white roller 41 is disposed immediately above the image reading position and on the downstream side in the transport direction,
At the image reading position R, the sheet document is in close contact with or close to the scraper sheet 20 and the document table glass 19 by the white roller 41. Further, since the scraper sheet 20 is disposed from the upstream to the downstream in the transport direction via the image reading position R as in the first embodiment described above, the sheet document can be satisfactorily separated from the document table glass 19. . Also, white roller 41
The sheet original is scraper sheet 20 and platen glass
Since it is in close contact with or in close proximity to 19, the image will not be out of focus. The white roller 41 is positioned at the image reading position R.
At the image reading position R, the scraper sheet 20 does not rub against the white roller 41 or the sheet document, and no scratch occurs.

[Other Embodiments] In the above embodiment,
The rotator for preventing defocusing of the image of the sheet document is a white roller in the first embodiment and a white roller in the second embodiment, but the present invention is not limited to this.
If it is a rotating body, its material, form, surface treatment and the like are not limited.

In the above-described embodiment, a facsimile apparatus is exemplified as an image forming apparatus provided with the image reading apparatus according to the present invention. However, the present invention is not limited to this. For example, another image forming apparatus such as a copying machine may be used. The same effect can be obtained by applying the present invention to the image reading device provided in the printer. Further, the present invention is also effective when applied to an image reading apparatus such as a scanner connected to a computer or the like.

In the above-described embodiment, an electrophotographic method is exemplified as a recording method. However, the present invention is not limited to this. For example, recording methods such as an ink jet method, a thermal transfer method, a heat-sensitive method, a wire dot method, and the like. Alternatively, other recording methods may be used.

[0057]

As described above, according to the present invention,
Since the rotating body is arranged at a position shifted in the transport direction from directly above the image reading position, the scratch on the transparent member is generated at a position shifted from the image reading position, and is generated at the image reading position. Disappears. Therefore, even if the transparent member is scratched, the image is not adversely affected, the occurrence of image defects can be prevented, and a good image can be obtained.

Specifically, for example, by disposing the rotating body at a position shifted from immediately above the image reading position to the upstream side in the transport direction, the sheet-shaped document can be separated from the transparent member by the rotating body at the image reading position. Since the sheet-shaped document is constrained by being closely attached to or close to the platen glass, it is possible to prevent fluttering around the image reading position of the sheet-shaped document during conveyance, and to prevent image blur and image reading unevenness caused by the fluttering. Image defects can be prevented from occurring. Therefore,
Good images can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view near an image reading position in an image reading apparatus according to a first embodiment.

FIG. 2 is a sectional view of the image reading apparatus when the facsimile apparatus according to the first embodiment is viewed from the front.

FIG. 3 is a front view (partially sectional view) of the entire facsimile apparatus according to the first embodiment;

FIG. 4 is a left side view (partially sectional view) of the entire facsimile apparatus according to the first embodiment.

FIG. 5 is an external perspective view of the facsimile apparatus according to the first embodiment.

FIG. 6 is a block diagram of a control system of the facsimile apparatus according to the first embodiment.

FIG. 7 is an enlarged cross-sectional view near an image reading position in an image reading apparatus according to a second embodiment.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Facsimile apparatus main body 2 ... Image reading part 2a ... Upper unit 2b ... Lower unit 3 ... Recording apparatus main body 4 ... Operation part 5 ... Control part 6 ... Partition part 11 ... Document mounting table 11a ... Slider 11b ... Extension tray 11c ... 11d: Support shaft 11e: Lifter spring 12: Sheet document transport section 12a: Separation pad 12b: Separation roller 12c ... Transport roller 12d ... Transport roller 12e ... Feed roller 12f ... Feed roller 12g ... Discharge roller 12h ... Discharge roller 13 ... Separation Pad holder 13a ... Support shaft 13b ... Stopper 14 ... Separation spring 15 ... Inner sheet guide 16 ... Outer sheet guide 17 ... Image sensor 18 ... Carriage 19 ... Stage glass 20 ... Scraper sheet 21 ... White roller 22 ... Pressed white sheet 23 ... Discharge trays 24, 25, 26, 27, 28, 29 Sensor 30 Laser scanner 30a Laser beam oscillator 30b Polygon mirror 30c Return mirror 31 Image forming unit 31a Photosensitive drum 31b Primary charging device 31c Developing roller 31d Cleaning blade 31e Recording cartridge 31f Transfer charging device 31g Thermal fixing device 31h Discharge roller 31i Shutter 32 Cassette feeding unit 32a Feed cassette 32b Feed roller 32c Cassette feed roller pair 32e Middle plate 32f Middle plate spring 33 Sheet discharge unit 34 Sheet transfer unit 34a Sheet transfer guides 34b and 34c Transfer belt 35c Sheet transfer inner guide 35d… U-turn guide on the cover side 35e… U-turn guide on the main body 35f… Registration sensor 36… Front cover 37… MP tray 38… Cassette feeding unit 39… Cartridge cover 40… Discharge cover 41… White roller 51… CPU 52… Operation Unit 53 LCD (display unit) 54 reading unit 55 recording unit 56 communication control unit 57 speakers 58 and 59 interface 60 HDD 61 MP 62 ... RAM 63 ... ROM 64 ... the image processing unit

Claims (6)

[Claims] 1. An image reading system in which a sheet-shaped document is conveyed by an automatic document feeder so as to pass through a predetermined image reading position on a platen glass, and an image reading system at the image reading position. The original reading mode for reading the image of the original document, a sheet-shaped original or a book-shaped original is statically placed in the image reading area on the original platen glass, and the image reading system reads the image along the original on the original platen glass. An image reading apparatus having a stationary document reading mode for reading an image of the document while moving the reading area, wherein an image reading position on the platen glass and a sheet-like document passing through the image reading position are interposed. A transparent member for guiding a sheet-shaped document to be conveyed; and a rotating body for bringing the sheet-shaped document into close contact with or close to the transparent member and the platen glass. Image reading apparatus characterized by being arranged serial from just above the image reading position at a position shifted in the conveying direction. 2. The image reading apparatus according to claim 1, wherein the rotating body is arranged at a position shifted from immediately above the image reading position to an upstream side in a transport direction. 3. The image reading apparatus according to claim 1, wherein the rotating body is arranged at a position shifted from immediately above the image reading position to a downstream side in a transport direction. 4. The amount of shift of the rotating body in the transport direction is determined.
The thickness is 0.3 mm or more.
The image reading device according to any one of claims 1 to 4. 5. When the diameter of the rotating body is about 16 mm,
The image reading apparatus according to claim 1, wherein a shift amount of the rotating body in a transport direction is set to be within 1.0 mm. 6. An image reading apparatus according to claim 1, further comprising: an image forming unit configured to record and form an image of the read document on a sheet material. Image forming device.