JPH0955831A - Read mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fluttering of an original at a read position and to guarantee improved image quality. SOLUTION: Carrying rollers 1-4 carry the original along a guide plate 10 in the direction of an original carrying direction 15. When the original is passed through the carrying rollers 3 and 4 and the tip part of an actuator 7 is pushed up, an auxiliary plate 5 is linked with the movement of the actuator 7 and lowered toward the side of stage glass 9 and a part near the irradiation position of irradiation light from a light source 11 in the original is pushed onto the stage glass 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading mechanism, and more particularly to a reading mechanism for reading a document in a facsimile machine or a copying machine.

[0002]

2. Description of the Related Art Conventionally, in this type of reading mechanism, as shown in FIG. 3, an original document (not shown) on a sheet is guided by guide plates 10 and 16 and is conveyed in a conveying direction 15 by conveying rollers 1 to 4. It is designed to be transported in the direction of.

The original is conveyed by the conveying rollers 1 to 4, and the stage glass 9 receives the irradiation light from the light source 11. Reflected light from the document with respect to the irradiation light from the light source 11 is incident on the photoelectric conversion element 14 via the mirror 12 and the lens 13, converted into an electric signal by the photoelectric conversion element 14, and output as image information of the document.

In the case of the above guide method using the guide plates 10 and 16, since the gap between the guide plates 10 and 16 is fixed, the document moves vertically between the guide plates 10 and 16, that is, The manuscript flutters.

In order to solve the problem of fluttering of a document between these guide plates, an auxiliary plate is provided so as to face the stage glass, and the gap between the stage glass and the auxiliary plate can be adjusted, and the auxiliary plate can be adjusted. By attaching an auxiliary roller to the and pressing the document against the stage glass with the auxiliary roller,
There is a technology that improves the image quality by suppressing the flapping of the original. This technique is described in detail in Japanese Patent Laid-Open No. 4-120531.

[0006]

In the above-mentioned conventional reading mechanism, the gap between the stage glass and the auxiliary plate can be adjusted, and the original is pressed against the stage glass by the auxiliary roller attached to the auxiliary plate. The fluttering of the document is suppressed and the image quality is improved.

However, since the thickness of the original document is required as the minimum gap between the stage glass and the auxiliary plate, and the original document cannot be completely pressed against the stage glass, the original document flaps and the read image deteriorates.

Further, although the auxiliary roller is attached to the auxiliary plate, when, for example, a wrinkled original is conveyed, the wrinkled portion is conveyed between the auxiliary rollers and the irradiation light is emitted to the portion where the original is lifted. When illuminated, a clear image cannot be read.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a reading mechanism capable of preventing fluttering at the reading position of a document and ensuring good image quality.

[0010]

In a reading mechanism according to the present invention, a document placed on a platen glass is placed between a first conveying member arranged immediately before the platen glass and the platen glass. A reading mechanism for optically reading the content by an optical member while being conveyed by a second conveying member disposed immediately after, and detecting that the leading edge of the original has passed the second conveying member. The detector includes a detection unit and a pressing member that presses the document on the platen glass according to the detection result of the detection unit.

In another structure according to the present invention, the pressing member may be arranged such that the pressing member is located at least near the irradiation position of the irradiation light from the optical member of the document conveyed on the platen glass. It is configured to press on the glass.

According to another reading mechanism of the present invention, a document placed on the platen glass is arranged immediately after the first conveying roller arranged immediately before the platen glass and the platen glass. A reading mechanism for optically reading the content by an optical member while being transported by the second transport roller, wherein the leading edge of the document comes into contact when the leading edge of the document passes through the second transport roller. And a pressing plate that is connected to the actuator and presses the original document onto the original platen glass when the actuator is pushed up by the original document.

In still another reading mechanism according to the present invention, in the above structure, the pressing plate is provided at least near the irradiation position of the irradiation light from the optical member of the document conveyed on the platen glass. It is configured so that it can be pressed onto the base glass.

[0014]

First, the operation of the present invention will be described below.

When it is detected by the actuator that the leading edge of the original has passed the conveying roller disposed immediately behind the stage glass, an auxiliary plate connected to the actuator is used to move the original near at least the irradiation position of the irradiation light from the light source. Press on the stage glass. As a result, it is possible to prevent fluttering at the reading position of the document and ensure good image quality.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, conveyance rollers 1 to 4 convey a document (not shown) along a guide plate 10 in a document conveyance direction 15. An auxiliary plate 5 is attached between the carrying rollers 1 and 2 and the carrying rollers 3 and 4 at a position facing the stage glass 9.

The auxiliary plate 5 is rotatably supported by a shaft member 6, and is connected to an actuator 7 arranged so that its tip end crosses the conveyance path outside the conveyance rollers 3 and 4 (right side in the figure). Has been done.

Therefore, when the original is conveyed by the conveying rollers 1 to 4 in the original conveying direction 15 and the tip of the actuator 7 is pushed up, the auxiliary plate 5 interlocks with the movement of the actuator 7 and the stage glass 9 is moved. It is designed to go down to the side. Incidentally, the auxiliary plate 5 is normally urged by a spring 8 in a direction in which its tip is separated from the stage glass 9.

When the document is conveyed onto the stage glass 9, the light source 11 irradiates the document with irradiation light.
Light emitted from the light source 11 passes through the stage glass 9 and is applied to the document, is reflected by the document, and is focused on the photoelectric conversion element 14 through the mirror 12 and the lens 13. The photoelectric conversion element 14 converts the reflected light from the document into an electric signal and outputs the electric signal as image information of the document.

FIG. 2 is a diagram for explaining the operation of one embodiment of the present invention. The operation of the embodiment of the present invention will be described with reference to FIGS.

When the actuator 7 is pushed upward after the leading edge of the original has passed the conveying rollers 3 and 4, the auxiliary plate 5 connected to the actuator 7 rotates about the shaft member 6 toward the stage glass 9 side. , The document being conveyed by the conveying rollers 1 to 4 is pressed against the stage glass 9.

In this case, since the auxiliary plate 5 presses the vicinity of the irradiation position of the light emitted from the light source 11 of the document against the stage glass 9, it is possible to prevent the document from flapping near the irradiation position of the light emitted from the light source 11. You can

Further, even if a document with wrinkles is conveyed, for example, the wrinkled portion is near the irradiation position of the irradiation light from the light source 11 by the auxiliary plate 5 to the stage glass 9
Since it is pressed against, the irradiation light does not irradiate the wrinkled portion that is extended and raised, so that a clear image can be read. Therefore, it is possible to prevent the image quality from being deteriorated due to the change in magnification.

When the original is conveyed by the conveying rollers 3 and 4, and the rear end of the original passes through the actuator 7, the tip of the auxiliary plate 5 is pulled upward by the spring 8, so that the tip of the actuator 7 crosses the conveying path. Go down,
The auxiliary plate 5 and the actuator 7 return to the initial state.

In this way, when the actuator 7 detects that the leading edge of the document has passed the transport rollers 3 and 4, the auxiliary plate 5 connected to the actuator 7 causes the auxiliary plate 5 connected to the actuator 7 to irradiate the document with at least the irradiation position of the light emitted from the light source 11. By pressing the vicinity on the stage glass 9, it is possible to prevent fluttering at the reading position of the document, and it is possible to guarantee good image quality.

[0026]

As described above, according to the present invention, when it is detected that the leading edge of the original has passed the second conveying member disposed immediately behind the original table glass, the original is conveyed on the original table glass. By pressing at least the irradiation position of the irradiation light from the optical member on the platen glass with the pressing member in the document to be fluttered, it is possible to prevent fluttering at the reading position of the document and ensure good image quality. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1-4 Transport rollers 5 Auxiliary plate 6 Shaft member 7 Actuator 8 Spring 9 Stage glass 11 Light source 14 Photoelectric conversion element

Claims (4)

[Claims] 1. A first conveying member arranged immediately before the original plate glass and a second conveying member arranged immediately after the original plate glass for an original placed on the original platen glass. A reading mechanism for optically reading the content by an optical member while being conveyed by means of detecting means for detecting that the leading edge of the original has passed the second conveying member, and a detection result of the detecting means. And a pressing member that presses the document on the platen glass accordingly. 2. The pressing member is configured to press at least the vicinity of the irradiation position of the irradiation light from the optical member of the document conveyed on the platen glass onto the platen glass. The reading mechanism according to claim 1. 3. A first conveying roller arranged immediately before the original plate glass and a second conveying roller arranged immediately after the original plate glass for an original placed on the original platen glass. A reading mechanism for optically reading the content by an optical member while being conveyed by an actuator, the actuator contacting the leading edge of the document when the leading edge of the document passes through the second transport roller, and the actuator. And a pressing plate that presses the original document on the original platen glass when the actuator is pushed up by the original document. 4. The pressing plate is configured to press at least the vicinity of the irradiation position of the irradiation light from the optical member of the document conveyed on the platen glass onto the platen glass. The reading mechanism according to claim 3.