JPS6023250A - Paper discharging roller device - Google Patents

Abstract

PURPOSE:To prevent a sheet of record paper from suffering from a scratch or folding by horizontally movably supporting the lower roller of opposing upper and lower paper discharging rollers and moving said lower paper discharging roller in the opposite direction of paper discharging, after discharging a record paper. CONSTITUTION:As an intermediate plate 25 is bounced up against a paper discharging roller 5 by means of a bouncing-up member 26 when the paper discharging roller 5 is rotating in a position shown in the solid line, sheets of record paper A on the intermediate plate 25 are sent one at a time onto a paper refeeding guide plate 3 by means of the separating action of a manipulating member 24. When the rear end of a sheet of record paper A is detected by a microswitch 12, a control shaft 13 is rotated, a swinging member 10 is swung counterclockwise by means of an energizing spring 9, and the paper discharging roller 5 is moved horizontally in the direction separating from the rear end of the sheet of record paper, while a patting bar 23 is lowered. Thereby the rear end part of a sheet of record paper can be collected on a paper discharging tray 2 without being caught by the paper discharging roller 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper ejection roller device used in an image recording apparatus such as an electrophotographic copying machine.

-Prior Art- As is well known, in an image recording apparatus such as an electrophotographic copying machine, a set of vertically opposed paper ejection rollers is located in the paper ejection section of the machine body, and these paper ejection rollers By the rotational movement of the machine, the recording paper on which the image has been recorded is ejected from the machine.

However, with such a configuration of the paper ejection roller, the trailing edge of the ejected recording paper is in a state of leaning against the surface of the paper ejection roller, which may become an obstacle to the passage of the following recording paper.
This causes problems such as the preceding recording paper being pushed by the succeeding recording paper and falling off the paper output tray.

For this reason, a conventional measure has been to attach a small protrusion to the circumferential surface of the ejection roller and use the protrusion to knock off the trailing edge of the recording paper that is leaning against the ejection roller. , the rear edge of the recording paper caught on the protrusion may be scratched, the recording paper may be creased, the subsequent processing of the recording paper during double-sided copying may become inward, or the finish of the recording may deteriorate. To,
Product value is damaged.

1. Object and Structure of the Present Invention 1. In view of the conventional problems as described above, the present invention ensures that the recording paper is ejected to the paper ejection tray without leaning on the paper ejection roller, and prevents scratches and scratches on the recording paper. The objective is to obtain a paper ejection roller device that does not cause creases, and in an ejection roller device that ejects recording paper to the outside of the machine using a pair of vertically opposed paper ejection rollers, the lower paper ejection roller is The present invention proposes that the recording paper be supported on a fixed part of the apparatus so as to be movable in a substantially horizontal direction, and that after the recording paper is discharged, the lower paper discharge roller is moved in the opposite direction to the paper discharge direction.

An embodiment of the present invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The illustrated embodiment is an embodiment in which the present invention is applied to a paper discharge section of a double-sided copying machine. A paper ejection tray 2 on which recorded paper Ai is loaded, and a refeeder that refeeds the paper A collected on the paper ejection tray 2 to the paper feed section (not shown) of the copying machine as necessary. A paper guide plate 3 is provided.

At the exit position of the attachment guide plate 1, a pair of paper ejection rollers 4 and 5 facing each other vertically is positioned, and the recording paper A is ejected by the rotational interlocking of these paper ejection rollers 4 and 5. The paper is discharged onto the paper tray 2.

That is, the upper paper discharge roller 4 is attached to a shaft 7 installed on the crosspiece frame 6, and is rotated in the direction of arrow X by a drive motor that drives the same shaft 7. Further, the lower paper ejection roller 5 is attached to a shaft 11 of a swinging member 10 that can swing around a fulcrum shaft 8 mounted on the machine frame 6 and is biased counterclockwise by a biasing spring 9. , is movable in a substantially horizontal direction. The swinging member 10 has a pin 15 facing an eccentric cam 14 of a control shaft 13 that is operated by a command from a microswitch 12 attached to the mounting guide plate l.

1, the control shaft 13 has an eccentric cam 19 that makes the intermediate shaft 16 face the driven pin 18 of the driven lever 17 supported on the fuselage frame 6, and the driven lever 17 is biased clockwise by a biasing spring 20. It is engaged with the lever 21. Same lever 21
A knocker 1E23 for knocking off the rear end of the discharged recording paper A from the paper discharge roller 5 is attached to the support shaft 22 in a cantilevered manner.

The paper ejection tray 2 includes a separating member 24 that engages with the circumferential surface of the paper ejection roller 5 located at the position shown in FIG. A rising member 26 is attached.

Therefore, when the paper ejection roller 5 is rotating in the position shown in FIG.
By the peeling action of the sorting member 24, the sheets are sent out to the refeed guide plate 3 one by one.

Since the above-mentioned embodiment has the above-described structure, the recording paper A is removed by the rolling contact movement of the paper ejection rollers 4 and 5 located at the positions shown in FIG.
will be taken out onto the paper discharge tray 2. When the rear end of the recording paper A is detected by the microswitch 12, the control shaft 13 is rotated to the position shown in FIG. , the paper discharge roller 5 moves in a substantially horizontal direction away from the rear end of the recording paper A. At the same time, the tapping rod 23 descends around the support shaft to the position shown in the second figure, so that the rear end of the ejected recording paper A is not caught on the ejecting roller 5 and is placed on the ejecting tray 2. collected on top.

Effects of the Present Invention As is clear from the above description, according to the present invention, a structure is obtained in which the discharged recording paper is reliably collected on the paper discharge tray without being caught by the paper discharge roller, and the recording paper is Since there are no scratches or creases on the paper, it is possible to record images with a good finish.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a sheet discharge section of a double-sided copying machine to which the present invention is applied, and FIG. 2 is an explanatory diagram of the operation of the same sheet discharge section. 4.5... Paper discharge roller, 10... Swinging member. Patent applicant Konishi Rokushari Kogyo Co., Ltd.

Claims (1)

[Claims] 1) In a paper ejection roller device that ejects recording paper to the outside of the machine using a pair of vertically opposed paper ejection rollers, the lower paper ejection roller is supported by a fixed part of the device so as to be movable in a substantially horizontal direction, and the recording paper is A paper ejection roller device characterized in that after ejecting a paper, a lower paper ejection roller is moved in a direction opposite to the paper ejection direction.