JP2000078368A - Original moving type reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove objects which have possibility of sting to the contact glass from an original by means of a simple structure, and to prevent the generation of the black stripes on copy images. SOLUTION: For this reader, a part of roll-like cleaning brush 9 is projected to an original carrying surface side from a hole provided on the original carrying direction downstream side of a carrying roller 5b on a carrying guide plate 4 on the lower side of a pair of upper and lower carrying guide plates 4 and 6 for introducing an original between an original pressing roller 1 and the contact glass 2. The rotation speed of the cleaning brush 9 and a contact pressure with the original are varied by a control part 19 according to the kind and thickness, etc. of the original.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original moving type reading apparatus in which an original moves on an image reading section.

[0002]

2. Description of the Related Art Conventionally, in an industrial copying machine, an original moving type reading apparatus which can reduce the size of the apparatus because the original is large is used. As a typical type of the original moving type reading apparatus, an original is conveyed with the image side facing down, and is passed through a gap between an original holding roller and a contact glass on an image reading unit (hereinafter referred to as a CCD). Therefore, there is a method of reading an image of a document.

In such an original moving type reading apparatus, when an original passes between the original pressing roller and the contact glass, an attached matter on the image surface side may adhere to the contact glass. This deposit is just C
If it adheres on the reading position of the CD, it always appears on the image when reading the original. For this reason, even if the attached matter is minute, it appears in the copy image as a line extending in the entire conveyance direction, that is, a so-called black stripe, and it becomes impossible to read the document image faithfully.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 3-31127, a document cleaning member is provided at a position in contact with the document conveying roller to contact and clean the surface of the document. There has been proposed an apparatus for cleaning a document by transporting the document while being sandwiched between document transport rollers. JP-A-56-4159, JP-A-56-5563, and JP-A-56-626
No. 2 and Japanese Patent Application Laid-Open No. Sho 56-40845 disclose an apparatus which is a fixed-document type reading apparatus, but which removes electricity from the contact glass by dust removing means in order to eliminate the deposits on the contact glass. If the member is replaced with a document cleaning member, the device can be a device for cleaning the contact glass.

[0005]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. Hei 3-3
In the apparatus disclosed in Japanese Patent No. 1127, since a document cleaning member is provided at a position where the document cleaning roller is in contact with the document conveying roller, the contact pressure of the document cleaning member changes depending on the thickness of the document. Image rubbing may occur.

In the apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 56-4159, a static elimination member is also driven by using a movable portion for driving a CCD of a fixed document reading apparatus in order to remove dust from the entire surface of a contact glass. However, when the static elimination member is replaced with a contact glass cleaning unit, the C
It is necessary to move the contact glass cleaning means separately from the movable part for driving the CD, which complicates the device structure.

According to the present invention, objects that may adhere to the contact glass can be removed from the original, the occurrence of black streaks in the copy image can be prevented, and the original image can be read faithfully. It is an object of the present invention to provide an original moving type reading apparatus having a simple structure capable of coping with a case where the thickness of the original is changed without causing the image to be distorted even if the original is placed.

[0008]

According to a first aspect of the present invention, in order to achieve the above object, an original moving type reading apparatus according to the first aspect of the present invention places an original between a contact glass and an original pressing roller via an original guide plate. A document moving type reading device that reads the document image while moving the document on image reading means disposed on the back surface of the contact glass. And a control unit for controlling the speed of the cleaning member or the contact pressure on the document in accordance with the type of the document.

That is, although the manner in which dust adheres depends on the type of the original, the dust can be effectively removed by increasing the speed difference of the cleaning member or increasing the pressure of the cleaning member for a thick original. On the other hand, if the speed and pressure of the cleaning member are too high, the original may be damaged if the original is too thin.If the original is additionally written with a pencil or a pencil, the pencil entry may be rubbed and copied as in the case of the thin original. May be difficult to read or the original may not be usable. Therefore, the rotation speed and pressure of the cleaning member suitable for the document can be set.

According to a second aspect of the present invention, in order to achieve the above object, the original moving type reader has means for selecting an original type from an operation panel.

According to a third aspect of the present invention, in order to achieve the above object, there is provided an original moving type reading apparatus, wherein the means for automatically detecting the thickness of the original, and the control means, based on the detection result of the thickness detecting means, provide the cleaning member. The above-mentioned control is performed.

According to a fourth aspect of the present invention, in order to achieve the above object, an original is passed between a contact glass and an original pressing roller via an original guide plate, and the original is placed on the back surface of the contact glass. In the original moving type reading apparatus for reading the original image while moving the original on the arranged image reading means, means for detecting the presence or absence of dust on the contact glass; And control means for displaying the cleaning information and for prohibiting the conveyance of the document as necessary.

[0013] That is, even if there is no dust on the original document, if there is dust on the contact glass, black stripes are generated. Check the cleaning information to the operator to prevent black streaks,
The conveyance of the document is prohibited if necessary.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a first embodiment of the original reading apparatus according to the present invention. The original moving type reading apparatus 10 according to the present embodiment includes a contact glass 2 on which an original is conveyed on a main surface thereof, and an image reading unit (CCD) 3 is disposed on the back side of the contact glass 2. Also, on the contact glass 2 main surface side,
The document pressing roller 1 is arranged to face the image reading unit 3. A gap is provided between the document pressing roller 1 and the contact glass 2 to hold the document. Note that the contact glass referred to in the present specification includes not only a glass material but also a material using a transparent resin or the like.

A pair of upper and lower transport guide plates 4 for introducing a document between the document pressing roller 1 and the contact glass 2 are provided upstream of the document pressing roller 1 in the document conveying direction indicated by an arrow A in FIG. 6 are provided. On the other hand, a pair of upper and lower discharge guide plates 7 a and 7 b for leading out a document discharged from between the document pressing roller 1 and the contact glass 2 are provided downstream of the document pressing roller 1 in the document conveying direction. is there. The paper discharge guide plates 7a and 7b are provided with paper discharge roller pairs 8a and 8b for nipping and transporting the original.

Although transport rollers 5a and 5b are provided in the middle of the transport guide plates 4 and 6, a lower transport guide plate 6 is provided.
The roller-shaped cleaning brush 9 is arranged so that a part thereof protrudes from the hole provided on the downstream side of the transport roller 5b in the document transport direction toward the document transport surface. The width of the cleaning brush 9 is set to be larger than the maximum sheet passing width. Cleaning brush 9
Rotates in the same direction as the transport roller 5b, and the rotation speed is higher than that of the transport roller 5b. A cleaning member 15 is provided so as to contact the cleaning brush 9. The rotation speed of the cleaning brush 9 can be changed by a motor 9a. The drive control of the motor 9a is performed by the control unit 19 according to the paper type of the document. The cleaning brush 9 can be moved up and down by a structure such as a combination of a motor and a gear (not shown).
The contact pressure on the document can be varied. The control of this pressure can also be performed by the control unit 19 in accordance with the paper type of the document.

The original pressing roller 1 and the cleaning brush 9
The static eliminator 16 is provided on the upstream end of the upper transport guide plate 4 further upstream in the transport direction. Static eliminator 1
For example, a high resistance may be inserted into the output side of the static electricity generated by the piezoelectric element, and a discharge electrode may be attached to the high resistance in a resin case. . Even if the operator touches the discharge electrode, there is no problem such as electric shock because the high resistance is inserted. Further, a second static eliminator 61 is provided on the downstream side of the cleaning brush 9 in the document conveying direction to prevent the charging of the document. The static eliminator 61 has the same configuration as the static eliminator 16.

Below the upstream end of the lower transport guide plate 6, there is provided a sensor 18 for detecting the passage of a document. The sensor 18 is also connected to the control unit 19, and the control unit 19 operates the motor 9 a that drives the neutralizers 16 and 61 and the cleaning brush 9 based on a signal output from the sensor 18.

Next, the original reading device 10 according to the present embodiment is described.
Will be described. A document having image information is placed on the document table 17, and the document side is the document transport direction A with the image side facing down.
The document is then inserted into the original reading device 10. The leading end of the document is held between the transport rollers 5a and 5b, and the transport guide plates 4 and 6 are held.
Transport between When the leading edge of the document reaches the document pressing roller 1 and the contact glass 2, reading of image information by the CCD 3 is started. After that, the original is discharged to the discharge roller pair 8.
a, 8b, and is conveyed between the paper discharge guide plates 7a, 7b to be discharged out of the apparatus, thereby completing the reading operation.

When the document sensor 18 detects a document during the above operation, the control unit 19 responds to the detection signal by the control unit 19.
6 is operated to remove the charge of the original due to the static electricity. As a result, relatively large dust among the dust adhering to the document falls, but small dust is conveyed to the downstream side together with the document. Further, the original comes into contact with the cleaning brush 9 and dust on the original surface is scraped off by the peripheral speed difference between the original feeding speed and the rotation of the cleaning brush 9. The scraped dust adheres to the surface of the cleaning brush 9 or falls from the cleaning brush 9 to the dust collecting unit 20.

As described above, since the cleaning brush 9 is provided with a difference between the document conveying speed and the peripheral speed in order to remove dust, the document may be charged by friction with the cleaning brush 9. When the document is charged again in this manner, dust may adhere again from the surface of the cleaning roller 9. Therefore, the charge of the document is removed again by the second neutralizer 61 downstream of the cleaning roller 9.

FIG. 2 shows a display unit as an example of an operation panel to be combined with the original reading apparatus of the embodiment shown in FIG.
Plain paper, tracing paper, and film can be selected as the paper type, and the paper thickness can also be input (if unknown, for example, it is better to input 70 μ as a general value). The type can be either copy or pencil. This selection can be made, and the control unit 19 of the embodiment of FIG.
If the rotation speed and pressure can be set, dust can be more reliably removed.

FIG. 3 is a sectional view showing a main part of a second embodiment of the original moving type reading apparatus according to the present invention. The original moving type reading apparatus 10 of the present embodiment includes a pair of transport rollers 5a,
5b is provided with a sensor 5c so that the thickness of the document can be detected. That is, the sensor 5c detects the amount by which the driven transport roller 5a moves by the thickness of the paper when the document passes. Also in this embodiment, by combining the operation panel of FIG. 2 and inputting the remaining information, that is, the paper type / type, an appropriate speed and pressure are given to the cleaning roller 9.

FIG. 4 is a sectional view showing a main part of a third embodiment of the original reading apparatus according to the present invention. The original moving type reading apparatus 10 of the present embodiment includes a contact glass 2
When there is dust on the top, it is not enough to clean and remove only the original with the cleaning brush 9 and the neutralizers 16 and 61, and to prevent the probability that black streaks are generated in the formed image from being high.
The detection of the presence or absence of dust on the contact glass 2 is also performed by using the CCD 3 for image reading, and the control unit 19 is configured to make a determination based on the image information. If dust is detected, for example, cleaning information is given to the operator through the operation panel, and if it is determined that the amount of dust is large, control is performed so that the conveyance of the original document itself is stopped.

[0025]

According to the first aspect of the present invention, there is provided an original moving type reading apparatus.
As described above, since the cleaning member is provided in contact with the moving document in the middle of the document guide plate, and the speed of the cleaning member or the contact pressure with the document is controlled in accordance with the type of the document. For thick documents, dust can be effectively removed by increasing the speed difference between the cleaning member and the cleaning member or by increasing the contact pressure of the cleaning member against the document.For thin documents, the speed and pressure of the cleaning member can be reduced. Thus, the original can be prevented from being damaged, and furthermore, even if the original is written in pencil, the image is not distorted.

According to the second aspect of the present invention, as described above, the original moving type reading device has means for selecting the type of the original from the operation panel. There is an effect that control such as cleaning and static elimination can be performed more effectively so that the paper type, paper thickness, type, etc. of the original can be easily selected.

According to the third aspect of the present invention, as described above, the cleaning member is controlled based on the detection result of the means for automatically detecting the thickness of the original. In addition to the effect, there is an effect that the operation becomes easier.

According to the fourth aspect of the present invention, as described above, the cleaning information is displayed on the operation panel according to the detection result of the means for detecting the presence / absence of dust on the contact glass, and if necessary, Control to prohibit the conveyance of the original, so that if there is dust on the contact glass, the dust can be removed before the image reading operation starts, and the conveyance of the original should be prohibited if necessary. Thus, there is an effect that black streaks can be reliably prevented from being generated in an image.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main part of a first embodiment of a movable document reading apparatus according to the present invention.

FIG. 2 is a plan view showing a display unit of an operation panel combined with the original moving type reading apparatus of the embodiment shown in FIG. 1;

FIG. 3 is a cross-sectional view illustrating a main part of a second embodiment of the original reading apparatus according to the present invention.

FIG. 4 is a cross-sectional view illustrating a main part of a third embodiment of the original moving type reading apparatus according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 document holding roller 2 contact glass 3 image reading section (CCD) 4, 6 transport guide plate 5 a, 5 b transport roller 5 c sensor 7 a, 7 b discharge guide plate 8 a, 8 b discharge roller pair 9 cleaning brush 9 a motor 10 original moving type Reading device 15 Cleaning member 16 Static eliminator 17 Document table 18 Sensor 19 Control unit 20 Dust collection unit 21 External power supply 61 Static eliminator A Document transport direction

Claims (4)

[Claims] An original for reading an original image while moving the original on an image reading means arranged on a back surface of the contact glass by passing the original between a contact glass and an original pressing roller via an original guide plate. In the movable reading device, a control unit for providing a cleaning member in contact with the moving original at an intermediate position of the original guide plate and performing control for varying the speed of the cleaning member or the contact pressure to the original according to the type of the original is provided. An original moving type reading device, comprising: 2. An original moving type reading apparatus according to claim 1, further comprising means for selecting an original type from an operation panel. 3. A means for automatically detecting the thickness of a document;
3. The original reading apparatus according to claim 1, wherein said control means controls said cleaning member based on a detection result of said thickness detecting means. 4. An original for reading an original image while moving the original on an image reading means disposed on the back surface of the contact glass by passing the original between a contact glass and an original pressing roller via an original guide plate. In the mobile reading device, a means for detecting the presence or absence of dust on the contact glass and a control for displaying cleaning information on the operation panel based on the detection result of the dust detection means and for inhibiting conveyance of the document as necessary. A moving document reading apparatus having control means for performing the reading operation.