JP2000270152A - Reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily clean the contact glass which is located at an original reading position. SOLUTION: In this reading device, an elastic member 11 is added on the outer circumference surface of a white roller 10. When the roller 10 is revolved, the dust G attached on the surface of the contact glass 6 located at a reading position is cleared away or adsorbed by the member 11. In such a constitution, it's possible to decrease the noises of read information which are conventionally caused by the dust etc., attached on the glass 6 and accordingly to improve the quality of the images which are reproduced according to the read information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a facsimile apparatus or a scanner apparatus, and serves as a reading sensor for optically reading document information, pressing a document to a reading position of the reading sensor, and serving as a white reference when reading. The present invention relates to a reading device having a white roller.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a document reading apparatus.
1, 1 is a transport roller for transporting the original, and 2 is installed between the transport rollers 1, 1 and has a built-in original illuminating means 3
A reading sensor 5 for optically reading document information by means of a light-receiving element 4 and the like, is installed above a contact glass 6 provided at a reading position of the reading sensor 2, and presses the document against the contact glass 6 and reads the document. It is a white roller that sometimes serves as a white reference for reading sensor 2 to read white reference information.

In the document reading apparatus having the above-described configuration, the document conveyed to the reading sensor 2 by the conveying rollers 1 and 1 is
Is pressed onto the contact glass 6 by the white roller 5,
The document information is optically read by the reading sensor 2 from the lower surface of the contact glass 6 while being transported in this pressed state.

[0004]

In the configuration of the conventional document reading apparatus, the document is conveyed while being pressed against the contact glass 6 at the time of reading the document. Is easy to adhere, and the dust etc. cause noise in the read information,
There has been a problem that image quality is degraded, for example, black stripes are generated in an image reproduced based on the read information.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a reading apparatus which can clean a contact glass at a document reading position with a simple structure.

[0006]

In order to achieve the above object, the present invention provides a reading sensor for optically reading document information, which presses a document onto a contact glass and uses a white roller as a white reference at the time of reading. In the reading device rotatably provided, an elastic member is extended in the main scanning direction of the reading sensor on the outer periphery of the white roller, and the surface of the contact glass is cleaned by the elastic member. Accordingly, dust and the like on the surface of the contact glass can be removed from the surface of the contact glass by the elastic member by the rotation of the white roller.

[0007] The present invention also provides that the projecting portion of the elastic member, which is provided so as to project from the outer peripheral surface of the white roller, is flush with the outer peripheral surface of the white roller when in contact with the contact glass. The roller can be deformed. With this configuration, the rotation of the white roller is performed smoothly, and the contact glass is surely cleaned.

Further, in the present invention, the elastic member is detachably provided on the white roller. With this configuration, the elastic member contaminated by the removed dust or the like can be easily replaced.

Further, according to the present invention, a concave portion for accommodating dust and the like removed by the elastic member is provided in a document conveying path close to the contact glass. Can be prevented,
Further, it is possible to collect the removed dust and the like.

[0010] Further, according to the present invention, in contact with the elastic member,
The elastic member includes a contact member that removes or absorbs dust and the like attached to the elastic member. With this configuration, the elastic member can be refreshed, and the service life of the elastic member is extended.

Further, the present invention is such that the white roller is pressed against the contact glass by the contact member. With this configuration, the contact member serves as a cleaner for the elastic member and a pressing member for the white roller. Points can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the following description, members corresponding to the members described in FIG. 9 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a block diagram of a document reading apparatus for explaining a first embodiment of the present invention, and FIG. 2 is a perspective view of a white roller according to the first embodiment. An elastic member (for example, felt material, foam material, cloth, or the like) 11 is extended in the main scanning direction of the reading sensor 2 on the outer periphery of the reading member 10 and has a length equal to or longer than the reading range width of the reading sensor 2. The end portion protrudes from the outer peripheral surface of the white roller 10.

By rotating the white roller 10 according to the above configuration, dust G or the like adhering to the surface of the contact glass 6 is wiped off by the elastic member 11,
In addition, it can be removed by scraping, or by adhering or adsorbing. For this reason, noise in the read information, which has conventionally been caused by dust on the contact glass 6, is reduced, and the quality of a reproduced image based on the read information can be improved.

Incidentally, the elastic member 11 is a white roller 10.
If the elastic member 11 is in contact with the contact glass 6 during the rotation of the white roller 10, the elastic member 11 does not come into close contact with the contact glass 6 when the white roller 10 rotates. In addition, when the elastic member 11 comes into contact with the contact glass 6 and when the elastic member 11 separates from the contact glass 6, the white roller 10 is caused to move up and down, thereby causing abnormal noise and unstable operation. There is a possibility that.

For this reason, the material of the elastic member 11 is
As shown in FIG. 3, when the contact roller 6 is in contact with the contact glass 6, a material and a material which are on the same surface as the outer peripheral surface of the white roller 10 and compress so as not to generate a lifting force on the white roller 10 are used. I do.

Further, the elastic member 11 itself becomes soiled by repeatedly removing dust and the like.
In such a case, the entire white roller 10 including the elastic member 11 may be replaced. However, the white roller 10 may not reach the end of its useful life, and as shown in FIGS. By providing the elastic member 11 detachably with respect to the white roller 10 and replacing only the elastic member 11, the cleaning effect on the contact glass 6 can be maintained.

In the example shown in FIG. 4, the adhesive S is applied to a part of the elastic member 11, and the concave portion 10 formed on the white roller 10 is formed.
aAttach it by pressing the adhesive S side against the bottom,
The elastic member 11 can be removed by holding and pulling it apart.

In the example shown in FIG. 5, a trapezoidal concave portion 10b is formed in the white roller 10 which is wide on the back side and narrow on the outside side, and the outer shape of the elastic member 11 is changed to the concave portion 1b.
0b, the elastic member 11
Is attached in a compressed state so as to fit into the concave portion 10b. The elastic member 11 can be removed by pulling the elastic member 11 outward.

FIG. 6 is a block diagram showing a main part of a document reading apparatus for explaining a second embodiment of the present invention.
In the embodiment, a dust storage recess 16 formed of a concave groove or a concave box is provided below the document transport guide plate 15 on the downstream side in the document transport direction in the reading sensor 2, and the dust G removed by the elastic member 11 is provided. The dust storage recess 1
6 to prevent dust and the like from escaping to the transport surface of the document transport guide plate 15 during the operation of removing the elastic member 11 due to the rotation of the white roller 10,
Also, the dust and the like can be collected.

FIG. 7 is a block diagram showing a main part of a document reading apparatus for explaining a third embodiment of the present invention.
In the embodiment, the contact member 19 that contacts the end of the elastic member 11 protruding from the outer peripheral surface of the white roller 10 and adsorbs dust and the like on the document transport guide plate 18 above the white roller 10
Is protruding. For this reason, when the elastic member 11 to which the removed dust or the like reaches the upper position by the rotation of the white roller 10, the elastic member 11 comes into contact with the contact member 19, so that the attached dust or the like is adsorbed by the contact member 19. Removed. By performing such cleaning of the elastic member 11, the cleaning effect can be maintained.

Further, as shown in FIG.
It is also conceivable that the contact member 19 applies a pressing force by which the white roller 10 is pressed against the contact glass 6 by being formed of an elastic material and brought into contact with the upper portion of the white roller 10. In this case, since the contact member 19 has both functions of the cleaner of the elastic member 11 and the pressing member of the white roller 10, the number of components can be reduced.

[0023]

As described above, according to the present invention,
Dust on the contact glass surface can be removed from the contact glass surface by the elastic member by the rotation of the white roller, and the cleaning of the contact glass at the document reading position is realized with a simple configuration, and the presence of dust etc. is read. Since it is possible to prevent the information from being mixed as noise, it is possible to improve the reading reliability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a document reading apparatus for describing a first embodiment of the present invention.

FIG. 2 is a perspective view of a white roller according to the first embodiment of the present invention.

FIG. 3 is an explanatory view showing a state in which the elastic member according to the first embodiment of the present invention is in contact with the contact glass.

FIG. 4 is an explanatory diagram illustrating a configuration of attaching an elastic member to a white roller according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing another attachment configuration of the elastic member to the white roller according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram showing a main part of a document reading apparatus for explaining a second embodiment of the present invention;

FIG. 7 is a configuration diagram showing a main part of a document reading apparatus for describing a third embodiment of the present invention;

FIG. 8 is a configuration diagram illustrating another installation example of the contact member according to the third embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional document reading apparatus.

[Explanation of symbols]

 2 Reading Sensor 6 Contact Glass 10 White Roller 11 Elastic Member 16 Dust Storage Concave 19 Contact Member

Claims (6)

[Claims] 1. A reading device in which a document is pressed onto a contact glass in a reading sensor for optically reading document information and a white roller serving as a white reference at the time of reading is rotatably provided. A reading device, wherein an elastic member extends in a main scanning direction of the reading sensor on an outer periphery, and the surface of the contact glass is cleaned by the elastic member. 2. The method according to claim 1, wherein the protruding portion of the elastic member provided to protrude from the outer peripheral surface of the white roller is deformed to the same surface as the outer peripheral surface of the white roller when in contact with the contact glass. 2. The reading device according to claim 1, wherein the reading is possible. 3. The reading device according to claim 1, wherein the elastic member is detachably provided on a white roller. 4. The reading device according to claim 1, wherein a concave portion is provided in the document conveying path adjacent to the contact glass to store dust and the like removed by the elastic member. 5. The reading device according to claim 1, further comprising a contact member that comes into contact with the elastic member to remove or absorb dust and the like attached to the elastic member. 6. The reading device according to claim 5, wherein the white roller is pressed against the contact glass by the contact member.