JPH04150658A - Original reader - Google Patents

Abstract

PURPOSE:To prevent dust from introducing into a device, and to prevent the degration of the picture quality by forming a conveying roller pair conveying an original into the device with a material having a slight adhesiveness, and removing the dust by sticking the dust stuck on the original to the conveying roller pair. CONSTITUTION:A conveying roller pair is formed by the material with the slight adhesiveness. When conveying an original 4 into the device and reading out, since the original 4 is conveyed by the conveying roller pair 5 having the slight adhesiveness, the small dust stuck on the original 4 sticks to the surface of the conveying roller 5 and is removed. Thus, it is possible to prevent the dust from inserting from outside and sticking to a contact glass 8 or an original reader 11 provided at the poststage of the conveying roller pair 5, and an influence by the dust when reading out the original can be removed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a document reading device using a contact sensor such as a facsimile machine or a scanner device, and in particular to prevention of deterioration of image quality due to dust etc. attached to the document. be.

[Prior Art] In the reading operation performed by a facsimile machine, since the facsimile machine is a device that converts a document into a dot-shaped image signal, the conditions are different from those of a copying machine, which reads with a slit of a constant width. Therefore, in order to form high-quality images, it is necessary to pay sufficient attention to minute dust.

There is a lot of dust around such facsimile machines, such as minute paper dust adhering to the originals, dust adhering to the original loading table from outside due to the installation condition of the equipment, and powder from erasers, etc. exists. These dust particles are brought into the apparatus by the original and scattered around the optical system.

Most of the reading devices of conventional facsimile machines are systems that use reduction optical systems, so the impact of dust scattered around the optical system is relatively small, and almost no countermeasures have been taken to prevent dust. . Even if this is done, as shown in Japanese Unexamined Patent Publication No. 58-181360, the document loading side of the guide plate for conveying the document is bent diagonally upward, and the back side of the document is Scrub to remove dust stuck to the original,
As shown in Japanese Patent No. 79655, a dust removal section is provided immediately before the reading section, and this dust removal section removes dust that has passed through the conveyance means.

[Problem to be solved by the invention]

In facsimile machines that are miniaturized and have an optical system disposed near the reading unit, for example, in a device that uses a contact sensor, if even a small amount of dirt enters the device, it will affect the quality of the read image.

However, the conventional dust removal method described above cannot completely prevent dust from entering the apparatus, and has the disadvantage that image quality is degraded by this dust.

The present invention was made to solve these shortcomings, and an object thereof is to provide a document reading device that can completely prevent dust from entering the device and prevent deterioration of image quality. That is.

[Means for Solving the Problems] A document reading device according to the present invention irradiates light from a light source onto a document conveyed by a conveyance means, and guides the reflected light to an image sensor through an optical system to capture nine images of characters on the document. The document reading device is characterized in that the conveyance means is provided with a dust removal means consisting of a pair of carry-in rollers having slight tackiness.

Further, the dust removal means includes a pair of brushed rollers that are provided immediately before the pair of carry-in rollers and rotate in a direction opposite to the document conveyance direction;
It may also be configured with a pair of carry-in rollers that have a static eliminating function.

[Effect]

In this invention, the pair of carry-in rollers for carrying the original into the apparatus are made of a slightly adhesive material, and the dust attached to the document is removed by adhering to the pair of carry-in rollers.

Further, a pair of brushed rollers is provided immediately before the pair of carry-in rollers, and by rotating this pair of brushed rollers in a direction opposite to the document conveyance direction, dust attached to the document is swept out of the apparatus. Then, the static electricity that has been charged on the document due to the friction between the brushed roller pair is eliminated by the carry-in roller pair that has a static elimination function.

〔Example〕

FIG. 1 is a configuration diagram showing an embodiment of the present invention. As shown in FIG.
and the lower body exterior cover 2 in the document loading section 3,
Loading roller pair 5 for loading 4 ft originals, loading roller pair 5
A contact glass 6 provided at the rear stage and serving as a guide for the original 4
, a document guide member 7 , a light source 8 that irradiates light onto the document 5 on the contact glass 6 , and an optical element 1o that images the reflected light from the document 4 onto a solid-state light receiving element 9 such as a CCD. and a pair of discharge rollers 12.

The carry-in roller pair 5 is made of a slightly adhesive material.

In the facsimile machine configured as described above, when the original 4 is inserted into the apparatus along the lower exterior cover 2 of the machine, it is conveyed by the pair of slightly adhesive carry-in rollers 5, and is moved to the original guide member 7 and the contact glass 6. pass between.

At this time, the image information on the original document 4 is irradiated with light from the light source 8, and the reflected light is imaged by the optical element 10 as dot-shaped image information on the solid-state light receiving element 9 and read.

Thereafter, the read document 4 is discharged from the apparatus by a pair of discharge rollers 12.

When the original 4 is transported into the device and read in this way, the original 4 is transported by the pair of import rollers 5 which have a slight adhesive property, so that small dust etc. attached to the original 4 will not stick to the surface of the pair of transport rollers 5. and removed. Therefore, it is possible to prevent dust from entering and adhering to the contact glass 8 and the document reading section 11 provided at the rear of the pair of carry-in rollers 5 from the outside, thereby eliminating the influence of dust when reading the document. be able to.

In the above embodiment, the case where the dust removal means is constituted by a pair of slightly adhesive carry-in rollers 5 has been described. It may be set in

FIG. 2 shows a pair of brush-like rollers 14 provided in front of a pair of carry-in rollers 13, and a pair of brush-shaped rollers 14 and a pair of carry-in rollers 1.
An embodiment will be shown in which the dust removal means is constituted by 3 and 3. As shown in the figure, a pair of brush-shaped rollers 14 provided before the pair of carry-in rollers 13 rotates in a direction opposite to the direction in which the document 4 is conveyed.

Further, the carry-in roller pair 13 is grounded by a grounding member 15 and has a static eliminating function.

In the facsimile machine configured as above,
When the original 4 is inserted, a pair of brush-like rollers 14 rotating in a direction opposite to the direction in which the original 4 is conveyed rotates to sweep out dust attached to the original 4 to the outside of the apparatus. Then, the original 4 with no dust attached thereto is sent onto the contact glass 6 by a pair of carry-in rollers 13.

At this time, the document 4 that has passed through the pair of brush-like rollers 14 is charged with static electricity due to friction with the pair of brush-like rollers 14 . If the document 4 charged with static electricity is sent as it is, it will adversely affect the conveyance system and the document reading section 11 in the apparatus. Therefore, when the document 4 passes through the pair of carry-in rollers 13, the static electricity of the document 4 is eliminated by the neutralizing action of the pair of carry-in rollers 13.

In addition, if the pair of carry-in rollers 13 is made to have a slight adhesive property, it is possible to exhibit a more effective dust removal effect.

〔Effect of the invention〕

As explained above, in this invention, the pair of carry-in rollers for carrying the original into the apparatus are made of a slightly adhesive material, and the dust attached to the document is removed by adhering to the pair of carry-in rollers. It is possible to completely prevent dust attached to the original from entering the apparatus, and it is possible to prevent image quality from deteriorating due to dust when reading the original.

In addition, a pair of brushed rollers is provided just before the pair of carry-in rollers, and by rotating this pair of brushed rollers in the opposite direction to the document conveyance direction, dust adhering to the document is swept out of the apparatus, and the friction between the pair of brushed rollers By eliminating the static electricity that has been charged on the original by using a pair of carry-in rollers that have a static-eliminating effect, it is possible to prevent dust from entering the reading section and eliminate the effects of static electricity on the transport system and optical elements, resulting in high-quality images. I can load it.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing another embodiment. 1; Upper body exterior cover, 2; Lower body exterior cover, 4
; Manuscript, 5-. 13. Pair of carry-in rollers, 6; contact glass, 7; document guide member, 8; light source, 9; solid light receiving element, 10; optical element, 11; document reading section, 12; pair of discharge rollers, 14; pair of brush-like rollers.

Claims (1)

[Scope of Claims] 1. In a document reading device that irradiates light from a light source onto a document conveyed by a conveyance means and guides the reflected light to an image sensor through an optical system to read characters and images on the document, the conveyance means described above. What is claimed is: 1. A document reading device comprising a dust removal means comprising a pair of slightly adhesive carry-in rollers. 2. The document reading device according to claim 1, wherein the dust removing means is provided immediately before the pair of carry-in rollers and comprises a pair of brushed rollers that rotate in a direction opposite to the document conveyance direction, and a pair of carry-in rollers that have a charge-eliminating function.