JPS59190156A - Recording sheet turning-over device - Google Patents

Abstract

PURPOSE:To enable delivery of sheets, of which pages are arranged out of order, by a method wherein a reversing roller is installed below a first delivery roller to supply a recording sheet to a second delivery roller. CONSTITUTION:A recording sheet turning-over device A has a machine frame 12 positioned adjacent to a fixing device 11. A first delivery roller 16 and an auxiliary roller 17 positioned adjacent thereto are located at the inlet of a passage 15 formed by a pair of guide plates 13 and 14, extending in an approximately horizontal direction, which are secured to the machine frame 12. A reversing roller 18, which is positioned under the passage 15 and turns in an opposite direction to a direction in which the first delivery roller 16 turns, is located at the outlet of the passage 15, and an auxiliary roller 19, which has a slight gap, provided between it and the reversing roller 18, wherethrough a recording sheet (b) can pass, is located above said reversing roller 18. This prevents bending of the recording sheet (b) and enables the sheet to be collected in an orderly manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for reversing recording paper discharged from a copying machine or the like.

In general copying machines, the copied recording paper is usually ejected with the image surface of the copy facing upward. Therefore, the later the recording paper is copied, the more it is collected in the tray with the paper facing upwards. Therefore, when copying books, etc., it is necessary to align the pages later or reverse the paper from the last page. It is necessary to take measures such as copying.

This is proposed in Publication No. 747. However, since this device has a structure in which the leading edge of the recording paper is received by a protrusion on a guide plate and the recording paper is turned over, it has the following drawbacks. First, depending on the size and stiffness of the recording paper used, the leading edge of the recording paper may not catch on the protrusion.
Only certain paper types can be used. In this structure, since the paper is reversed by the paper ejecting movement and the restoring force of the recording paper, the collection state tends to deteriorate, and it often takes time to take out the recording paper from the tray.

In view of the actual situation of the conventional recording paper reversing device as described above, the present invention aims to provide a structure that can reliably reverse any type of recording paper and eject the recording paper in an orderly manner. A reversing roller that can feed the recording paper is installed at the bottom of the recorded recording paper that is sent out in a substantially horizontal direction by a first ejection roller that rotates in one direction, and the reverse movement of the reversing roller causes the recording paper to be removed. A recording paper reversing device is proposed in which the end of the recording paper is supplied to a second ejection roller that cooperates with the first ejection roller, and the recording paper is reversed by a reversing guide plate located below the second ejection roller.

Embodiments of the invention will now be described in detail with reference to the drawings.

The illustrated embodiment is an embodiment in which a recording paper reversing device A according to the present invention is incorporated into an electrophotographic copying machine iB, and an exposure optical device 1 that optically scans an image of an original document a of the electrophotographic copying machine Bi.
and two paper feeding devices 3 that feed recording sheets one by one to the photoreceptor drum 2, and around the photoreceptor drum 2 there are a charging electrode 4, a developing device 5, a transfer electrode 6, and a separation electrode 7. , a static elimination electrode 8, and a cleaning device 9 are arranged in this order in the rotational direction.

Therefore, after the toner image of document a is transferred to the recording paper bK supplied from the paper feeding device 3 to the photosensitive drum 2, the recording paper bK is transferred to the fixing device 11 by the conveyor belt device 10, and the toner image is fixed thereon. The recording paper is then discharged to the recording paper reversing device A.

As shown in an enlarged view in FIG. 2, the recording paper reversing device A according to the present invention has a body frame 12 located adjacent to a fixing device 11, and a pair of substantially horizontally arranged body frames 12 fixed to the body frame 12. At the entrance of the passage 15 formed by the guide plates 13 and 14, there are located a first ejection roller 16 that rotates in the direction of the arrow and an auxiliary roller 17 that rolls into contact with the first ejection roller 16.

At the exit of the passage 15, a reversing roller 18 is located at the bottom of the passage 15 and rotates in the opposite direction to the first discharge roller 16. Above the reversing roller 18, the reversing roller 18 and An auxiliary roller 19 is provided to form a slight gap between which the recording sheet can pass. That is, the auxiliary roller 19 is a pair of reversing rollers]8 as shown in the third figure.
, and forms a gap Ll in the width direction of the recording paper sheet between it and the reversing roller 18. Therefore, the feed movement of the first discharge roller 16 and the auxiliary roller 17 causes the paper discharge port 2 to
The recording paper bH1 that is being fed toward the paper output tray 21 is folded into a wave shape between the auxiliary roller 19 and the reversing roller 18 and is in a so-called 1-stacked state, and is in a substantially horizontal state. There is no possibility that the collection state will be affected by contact with the recording paper.

However, the present invention is not limited to the above-described relationship between the reversing roller 18 and the auxiliary roller 19, but the auxiliary roller 19 is positioned directly above the reversing roller 18, and a vertical gap is formed between them. You may.

Further, a base portion of a suppressing member 23 that can come into contact with the upper surface of the recording sheet is swingably attached to the mounting shaft 22 of the auxiliary roller 17. m V The m-shaped suppressing member 23 is urged in the direction of arrow X by gravity, so that the rear end of the recording paper is between the first discharge roller 16 and the auxiliary roller 1.
7, the rear end of the recording paper sheet is deflected by the force of the pressing member 23 like a virtual water drill.

A second ejecting roller 24 is positioned at the lower part of the entrance of the passage 15 and rolls into contact with the circumferential surface of the first ejecting roller 16 , and the recording paper that is reversely fed by the force of the reversing roller 18 is transferred to the first ejecting roller 16 . The reversing guide plate 25 is supplied to the ``U''-shaped reversing guide plate 25 by the rolling movement of the second discharge roller 24. and a take-out end portion 25b located at the bottom of the
The intake end 25a and the output end 25b are connected through an arcuate intermediate section 25C. An auxiliary roller 26 is positioned below the reversing roller 18, that is, at a position facing the paper ejection port 20, and cooperates with the reversing roller 18 to send out the reversed recording sheet to the paper ejection tray 21. .

Since the above-mentioned embodiment has the above-described structure, the recording paper on which the image has been fixed by the fixing device 11 is transferred to the first ejection roller 16.
Due to the feeding movement, the paper is sent out through the multiple passages 15 toward the paper discharge port 20. In this case, the reversing roller 1
Although the reverse feeding force of 8 is applied, the recording paper is
8, the leading edge of the recording paper sheet leaks onto the paper discharge tray 21 as shown in the second figure.

Then, when the rear end of the recording paper comes off the @1 ejection roller 16, the rear end of the recording paper is pushed downward by the force of the suppressing member 23 like a virtual water shaker in FIG. against ta
Since the driving force of the d-rolling roller 18 is applied, the rear end of the recording sheet is pushed into the rolling contact area between the first ejection roller 16 and the second ejection roller 18, and the first ejection roller 16 and the second ejection roller 1
By the rotational movement of 8, it is fed into the reversing guide plate 25.

The recording sheet is deflected into a "U" shape by the reversing guide plate 25 and taken out onto the sheet discharge tray 21 with the image surface facing downward. Therefore, the recording sheets are stacked on the paper ejection tray 21 in the order in which they are ejected, with the image side facing downward, so that the recorded state of the pages can be obtained by simply taking out the stacked state. can.

In the above embodiment, the structure using the suppressing member 23 has been described, but the rear end of the recording paper sheet is connected to the first ejection roller 1.
6 tends to be guided by the rolling contact position housing with the second discharge roller 24, so the suppression member 23 is not necessarily required. Furthermore, if the reversing roller 18 in the embodiment described above is rotated in the normal direction when only one sheet is to be recorded, there is an advantage that the recording sheet can be taken out directly onto the sheet discharge tray 21 from the position of the reversing roller.

As is clear from the above description, according to the present invention, it is possible to obtain a recording paper reversing device that automatically aligns pages, and this recording paper reversing device can reliably process any type of recording paper. Direct extraction can be easily performed by simply rotating the reverse roller in the forward direction. It is also possible to reverse feed the recording paper into the copying machine and use it as a double-sided copying machine by only slightly modifying the water device.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of an electrophotographic copying machine to which the present invention is applied, FIG. 2 is an enlarged sectional view of the main parts of the same, and FIG. be. A... Recording paper reversing device, b... Recording paper, 16.
...First discharge roller, 18...Reversing roller, 24
...Second discharge roller, 25...Reversing guide plate.

Claims (1)

[Claims] 1) A reversing roller on which the recording paper can be placed is installed at the bottom of the recorded recording paper that is sent out in a substantially horizontal direction by the '@1 ejection roller that rotates in one direction. A recording paper reversing device characterized in that an end of the recording paper is supplied to a second ejection roller that cooperates with the first ejection roller, and the recording paper is reversed by a reversing guide plate located below the second ejection roller.