JPS5824268A - Original feed roller mechanism - Google Patents

Abstract

PURPOSE:To reduce load torque and to prevent deterioration in picture quality by press-contacting the large diameter part of a roller to a contact sensor surface by the weight of the roller or a spring in a facsimile equipment which uses a contact type sensor. CONSTITUTION:Auxiliary rollers 8 are provided at both ends of a rubber roller 4 so that they are at distance greater than the width (a) of an original 7 on sensor cover glass 2, and thus an about 0.05mm. gap less than the thickness of the original is left between the rubber roller 4 and sensor cover glass 2. When the original 7 is sent onto a cntact sensor 1 through the rotation of the roller 5, the original 7 never floats higher than the gap between the rubber roller 5 and sensor cover glass 2 and runs smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document feed roller mechanism, and more specifically, to a document feed roller mechanism for facsimile in which only a large portion of the diameter at both ends contacts the contact sensor surface. .

In the conventional document feeding mechanism for the 7-axis i9, as shown in FIG. A belt 6 is hung so as to When the row 25 rotates, the document 7 is fed and reaches the reading position 2, and the rubber roller 4 rotates while pressing the document 7 against the sensor cover glass 3. At this time, until the document 7 reaches the rubber roller 4, the rubber roller 4 rubs against the sensor cover glass 3, resulting in increased frictional resistance and increased load torque. Further, since the document 7 is pressed against the sensor cover glass S by the rubber roller 4, the rubber roller 4 and the sensor cover glass S are easily soiled, resulting in poor image quality.

The object of the present invention is to eliminate the drawbacks of the prior art described above, and to prevent reduction in load torque and deterioration in image quality.

That is, the present invention is characterized in that the distance between the rubber row 2 and the sensor cup (-) is set slightly to prevent the original from lifting up, and also to prevent the rubber a-9 from coming into direct contact with the sensor cover. The present invention is shown in FIGS. 2 and 5.
An embodiment shown in the figure will be described in detail.

As shown in FIGS. 2 and 3, auxiliary rollers 8 are provided at both ends of the rubber roller 4 at a position away from the width a of the document 7 on the sensor cover glass 2, and the rubber roller 4 and the sensor cover glass 50 are
The configuration is such that there is a gap of approximately α05−, which is smaller than the thickness of the original document.

The auxiliary roller 8 is made of hard rubber, plastic, or aluminum to reduce the frictional resistance between the auxiliary roller and the sensor cover glass 5 even when the auxiliary roller 8 rotates.

As the roller S rotates, the belt 6 causes the rubber roller 4 and the auxiliary roller 8 to also rotate, and the document 7 is sent over the contact sensor 1. At this time, the original 7 does not rise above the distance between the rubber roller 5 and the sensor cover glass 20, and the original 7 runs smoothly.

Although the example in which the auxiliary rollers 8 are attached to both sides of the rubber roller 4 has been described, the same effect can be obtained by slightly increasing the diameter of both ends of the rubber roller itself.

Furthermore, metal rings or plastic rings may be fitted to both ends of the rubber roller 40.

As described above, according to the present invention, by making both ends of the rubber roller slightly larger in diameter than the other parts, the load torque can be reduced by about 1/1o by lifting the rubber roller from the glass surface.
It can be reduced to

A smaller motor can be used, the rubber roller no longer presses the document against the glass surface, dirt is less likely to accumulate on the rubber roller and the glass surface, and the number of times this area is cleaned can be reduced by about 1/10. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional document feeding mechanism, FIG. 2 is a side sectional view showing an embodiment of the present invention, and FIG. 1 is a view taken along the arrow in FIG. 1...Contact type sensor, 2...Sensor cutter (-glass, G...reading position, 4...Rubber roller, 6...Belt, 7・・・・・・Manuscript, 8・・・・・・Auxiliary roller.Representative Patent Attorney Usui 1) Rikushi 1st figure 2nd figure

Claims (1)

[Claims] (11) In a facsimile machine using a light source for document illumination and a contact type sensor having a photoelectric conversion function in the reading system,
In order to maintain a constant distance between the document feed roller and the surface of the contact type sensor at the reading position of the contact type sensor, both ends of the row 2 are made thicker than other parts so as to be in contact with the surface of the contact type sensor at a position wider than the inside of the document. The document reading unit mechanism is characterized in that the large diameter portion is pressed against the contact sensor surface by the roller's own weight or by a spring. (2) Claim 1, characterized in that the document feed roller has a configuration in which auxiliary rollers having a diameter larger than the diameter of the cough roll are disposed at both ends thereof, and the auxiliary rollers are in contact with each other. Document feed roller mechanism as described.