JPS60114875A - Copy paper carrying device for copying machine - Google Patents

Abstract

PURPOSE:To make double face copying possible and improve the copying efficiency by feeding a copy paper onto a circulating belt and reversing a carrying direction control roll more quickly than rotation and rotating an eject roll quickly synchronously with the carrying direction control roll. CONSTITUTION:For the purpose of feeding the inverted copy paper onto a copy tray 5 in a short time, a command signal is issued in the stage, where the rear end part of the copy paper is held yet between carrying direction control rolls 29 and 29', to reverse carrying direction control rolls 29 and 29' in a speed higher than the rotative speed of feeding rolls 26 and 26' and that of forward rotation of carrying direction control rolls 29 and 29', and eject rolls 44 and 44' are rotated in a high speed also synchronously with the reversing speed of carrying direction control rolls 29 and 29'. Since the inverted copy paper A is fed onto the copy tray 5 in a short time, paper jam is resolved. By this constitution, double face copying of the copy paper is possible, and copy papers are economized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copy paper transport device for a copying machine, and more particularly to a copy paper transport device for a copy machine that can copy both sides of a copy paper.

Conventionally, the copy paper used to copy materials such as manuscripts has only been copied on one side.
The need for double-sided copying has arisen in order to save copy paper, and because when a large amount of copy paper is consumed, the amount of paper used can be halved and copy paper can be stored more efficiently.

In order to make double-sided copies, a complicated method is used in which one side of the copy paper is copied, the copy paper is ejected from the output port, the paper is manually turned over, and the copy paper is placed in the feed port and copied again. The drawback was that it was inefficient.

In order to eliminate these drawbacks, some large-scale copying machines have been developed that automatically flip the copy paper and make double-sided copying possible, but this requires a complicated flipping mechanism and requires equipment. It also became larger, and as a result it could not be adapted to small desktop machines.

Therefore, the present invention provides a transport direction control roller 29 that transports the copy paper A supplied from the first paper feed cassette 3 and having an image transferred and fixed on one side in a commanded direction based on a command signal. , 29'
a return belt 3 that returns the paper toward the second paper feed cassette 4;
3, and a reversing roller 404 that sends the copy paper A fed through the return belt 33 into the second paper feed cassette 4 in an inverted state so that the image is transferred to the other side.
0' and discharge rollers 44, 44' for discharging the copy paper A on which the image has been transferred to the copy tray 5, and by rotating the conveyance direction control rollers 29, 29' in the forward direction according to the command signal, the copying machine is Paper A is sent to the return belt 33, and then the paper A is sent to the transport direction control roller 29.
. The said return ilt 33
The main purpose of the present invention is to provide a copy paper transport device for a copy machine that can perform double-sided copying and improve copying efficiency by providing a copy paper transport device for a copy machine that can quickly feed the copy paper to the copy tray 5 without having to send the paper to the copy tray 5. This is the purpose.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a simplified cross-sectional view of the copying machine in an inverted state, and FIG. 2 is a cross-sectional view of the copying machine that makes copies on the other side of the inverted state. In the figure, reference numeral 1 denotes a main machine frame, and a transparent plate 2 on which a document is placed horizontally is provided above the frame. The first paper feed cassette 3, which stores the copy paper A, is attached to the center shaft at the right end of the main machine frame 1, as shown in FIG. A cassette 4 is provided below the first paper feed cassette 3, and the copy paper after copying is discharged to a copy tray 5 provided at the left end in FIG. Note that the paper feed cassettes installed in the main machine frame l in this way are the first paper feed cassette 3 and the second paper feed cassette installed vertically.
The number of paper feed cassettes 4 is not limited to two in two stages, but a large number of paper feed cassettes 4 may be arranged vertically in multiple stages, such as three in three stages, to store copy sheets of various sizes.

A photosensitive drum 6, whose entire circumferential surface is coated with a photosensitive layer (not shown) 5, is rotatably mounted approximately in the center of the main machine frame 1. The reflected light is projected onto the photosensitive layer via the movable reflecting mirrors 7 and 8, the in-mirror lens 9, and the reflecting mirror 10 to form an image of the original document, thereby forming an electrostatic image on the photosensitive layer. Around the photosensitive drum 6, there is a charging corona discharger 11 for charging the photosensitive layer, a developing device 12 that visualizes the electrostatic latent image formed on the photosensitive layer and converts it into a toner image, and A transfer corona discharger 13 for transferring the toner image formed on the photosensitive layer onto copy paper, and a cleaning device 14 for removing toner remaining on the photosensitive layer after transfer are disposed.

18 , 18', 20, 20', 22, 22'
, 23.

Reference numeral 23' designates a pair of conveyance rollers for conveying the copy paper A that has been pushed up by the lever 16 and fed by the paper feed roller 15 for single-sided copying. Also 1
7 and 17' are the paper feed roller 15 and the conveyance roller 18.
, 18' is a guide plate provided between 19,
A pair of guide plates I'l', 21, 21', 24, and 24' are installed between the rollers and guide the copy paper between the rollers. Reference numeral 25 denotes a fixing device, and the copy paper heated and fixed here is delivered to feed rollers 26 and 26'.
a first guide path that is sent out by the machine and goes to the copy tray 5 via the discharge rollers 44 and 44', and a second guide path that branches vertically from this first guide path and goes to the route 33 for return.
It is transported along the guide path.

A substantially triangular transport direction switching plate 27 is provided between the feed roller 26° 26' and the discharge rollers 44, 44' to branch into these two guide paths.

This conveyance direction switching plate 27 is pivoted by a pivot shaft 27a, and can be rotated about the pivot shaft 27a by a command signal, and when it is rotated in the horizontal direction as shown in FIG. The copy paper sent out from 26, 26' passes over the conveyance direction switching plate 27, follows the thread path shown by the imaginary line, passes through the discharge rollers 44, 44', and takes the first guide path toward the copy 0-receiver tray 5. . Other conveyance direction switching plate 2
7 rotates upward, that is, in the direction in which the oblique side portion 27b faces the feed rollers 26, 26', the copy paper fed out from the feed rollers 26, 26' takes a second guide path that comes into contact with the conveyance direction switching plate 27 and branches in the vertical direction.

A pair of guide plates 28 are provided below the conveyance direction switching plate 27.
28' is disposed, and below the guide plate 28', a pair of transport direction control rollers 2.
9 and 29' are arranged. These conveyance direction control rollers 29, 29' are branched by a conveyance direction switching plate 27, and in response to a command signal, the copy paper guided by the guide plates 28, 28' is returned to the route 33 located below.
The paper can be rotated so as to be fed into the copy receiver 5 (hereinafter referred to as reverse rotation) through the discharge rollers 44 and 44' located above (hereinafter referred to as reverse rotation).

As shown in FIG. 1, this return belt 33 is stretched between a rotary roller 31 located at the left end of the auxiliary machine frame 30 and an R route roller 32 located at its right end. Note that the return belt 33 is not limited to a belt, and a roller conveyor may be used as long as the copy paper can be placed on it and conveyed. A belt roller 34 is disposed on the belt roller 32 to sandwich the return belt 33, and a belt roller 35 is provided diagonally above the belt roller 34 to protrude from the main machine frame 1.
An auxiliary belt roller 37 is provided below this belt roller 35, holding a belt 38 between the belt rollers 35, and a belt roller 37.
An auxiliary belt 36 is provided between the
An auxiliary belt 38 is stretched between the rollers 37 and 37, and the copy paper conveyed by the return belt 33 is held between the auxiliary belts 36 and 38 and fed to the guide plate 39°39'. The guide plates 39, 39' are attached to the paper feed cassette 4, and a pair of reversing rollers 40, 40' are provided at their rear ends. The single-sided copy paper that has been guided through the space is rotated so as to be fed into the second paper feed cassette 4 (hereinafter referred to as reverse rotation), or rotated in a direction away from the second paper feed cassette 4. (hereinafter referred to as forward rotation).

To explain double-sided copying of copy paper using the copy paper conveying device with the above configuration, as shown in FIG. The second paper feed cassette 4 is an empty cassette in which copy paper is not fully stored. In this state, the copy paper A stored in the first paper feed cassette 3 and pushed up by the lever 16 is fed from the first paper feed cassette 3 by the paper feed roller 15. This fed copy paper is transferred to a pair of guide plates 17, 17', transport rollers 18, 18
', guide plate 19, 19', conveyance rollers 20, 20'
, guide plates 21, 21', and is conveyed by a pair of conveying rollers 22, 22' so as to be brought into close contact with the photosensitive layer of the photosensitive drum 6 facing the transfer corona discharger 13, where it is transferred. After the transfer is completed, the copy paper is transferred to the transport roller 2'3.
．． 23', the image is sent to the fixing device 25 and fixed thereon. The fixed copy paper passes through transport rollers 26, 26' and comes into contact with a transport direction switching plate 27. In this case, the conveyance direction switching plate 27 has been previously rotated about the pivot shaft 27a by a command signal in a direction in which the upper side, that is, the oblique side 27b faces the conveyance rollers 26, 26'.
The copy paper sent out in the horizontal direction by 6' comes into contact with the conveyance direction switching plate 27, branches, and is directed downward in the vertical direction, and as shown in FIG.
forward rotation of the conveyance direction control rollers 29, 29' guided by ? From this, the copy sheet is returned (placed on the belt 33). At this stage, the copy paper is reversed. That is, one side of the copied paper is in contact with the return belt 33, and one side that has not yet been copied is exposed. (The copy paper placed on the route 33 is
As shown in FIG. 1, the guide 9 is conveyed to the right by the movement of the return belt 33, is held between the auxiliary coils 1-36 and 38, and is attached to the second paper feed cassette 4.
A pair of reversing rollers 40, 4 are guided by plates 39, 39'.
0'. And this pair of reversing rollers 40,
By the forward rotation of 40', the leading edge of the copy paper A is projected from the reversing rollers 40, 40', and at the stage where the rear end is still held between the reversing rollers 40, 40', the reversing rollers 40, 40' are commanded. The copy paper A is rotated in the reverse direction by a signal and fed into the second paper feed cassette 4 with one side that has not yet been copied facing up.

Next, in order to copy this one side that has not been copied yet, the conveying direction switching plate 27 is rotated in parallel to the conveying direction of the copy paper in response to a command signal. That is, it is displaced to the position shown in FIG. Then, the paper feed roller 41 feeds the copy paper pushed upward by the lever 42 from the second cassette 4.

The fed copy paper is guided by the guide plates 43, 43' and led to the conveyance rollers 20, 20', where it is then transferred and fixed via the above-mentioned thread path and conveyed [1-ra 26°2
6', as shown by the imaginary line in FIG. 2, passes over the conveyance direction switching plate 27 without contacting the conveyance direction switching plate 27, and passes through the discharge roller 44. It is fed into the copy tray 5 by '44'. In this way, double-sided copying can be completed.

In this way, during double-sided copying work, there are cases where the copying of a document, such as a book, whose pages are aligned sequentially, ends at the odd-numbered page. In this case, the final copy can be made on only one side, but it becomes necessary to reverse the copy onto the copy tray 5 so that the edges are aligned.

In order to reverse the sheet, the return belt 33 in the auxiliary machine frame 30 feeds the single-sided copy sheet to the second sheet feed cassette 4. The document must be removed from the second paper feed cassette 4 to make a hidden copy, which is time consuming and troublesome. In order to avoid such trouble, copy paper fed from the first paper cassette 3 and copied on one side is fed from the first paper cassette 3 and copied on one side, as shown in FIG. The paper is pulled out by the pull-out rollers 26, 26' as shown in the imaginary line, comes into contact with the conveyance direction switching plate 27, and is guided downward, and is returned to the route 33 by the conveyance direction control rollers 29, 29'. At the stage where the leading edge of the copy paper has moved away from the conveyance direction control rollers 29, 29' and is in contact with the return belt 33, but the trailing edge is still held by the conveyance direction control rollers 29, 29', By reversely rotating the conveyance direction control rollers 29, 2.9', the copy paper is guided from the conveyance direction control rollers 29, 2.9' to the ejection rollers 44, 44', and is fed into the copy tray 5 in an inverted state and thrown. - This means that alignment can be achieved.

By the way, in this way, the conveyance direction control roller 29°29'
By rotating in the opposite direction, it is possible to feed the reversed copy paper immediately into the copy tray 5 without feeding it into the second paper feed cassette 4, but the shorter the time the copy paper is fed into the copy tray 5, the better. It is desirable. Especially in medium and high speed copying machines, the copy tray 5 is
The next copy sheet with the image transferred thereon is pulled out from the pull-out rollers 26, 26' before it is fed into the paper, comes into contact with the conveyance direction switching plate 27, is guided by the guide plates 28, 28', and is guided by the conveyance direction control rollers 29, 28'. 29'. As a result, the next copy paper, which should normally be fed to the second paper feed cassette 4 via the belt 33 and the reversing rollers 40, 40', is transferred to the return belt 33.
The conveyance direction control rollers 29, 2
Reverse rotation of 9' causes the inconvenience of paper jams.

Therefore, in order to feed the reversed copy paper to the copy tray 5 in a short time, the leading edge of the copy paper is separated from the conveyance direction control rollers 29, 29', and the return paper is in contact with the route 33. , while the rear end is still clamped by the conveyance direction control rollers 29, 29', a command signal is issued to control the rotational speed of the delivery rollers 26, 26' and the forward rotation of the conveyance direction control rollers 29, 29'. If the conveyance direction control rollers 29, 29' are reversely rotated faster than the conveyance direction control rollers 29, 29', and the discharge rollers 44, 44' are also rotated quickly in synchronization with the reverse rotation speed of the conveyance direction control rollers 29, 29', the conveyance direction control rollers 29, 29' can be reversed. The copied paper A can be fed to the copy tray 5 in a short time, and the above-mentioned inconvenience can be solved.

As detailed above, since the present invention has the above configuration, it is possible to perform double-sided copying of copy paper, which was difficult in the past, and as a result, copy paper can be saved and storage becomes efficient.

In addition, since the conveyance direction control roller can be rotated in forward and reverse directions, the copy paper can be reversed without returning the single-sided copy paper to the second paper feed cassette, which is effective for aligning paper edges, etc. .

Furthermore, since the reverse rotation of the conveyance direction control roller is made to rotate faster than its forward rotation, and the discharge roller is rotated faster in synchronization with this reverse rotation, there are advantages such as smooth copying operations.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a simplified cross-sectional view of the copying machine in a reversed state, and FIG. 2 is a state in which the copying machine is reversed and the other side on which no image has been transferred is being copied. FIG. 3 is a sectional view of the copying machine, and is an explanatory diagram of a reversed state of the conveyance direction control roller. 3...First paper feed cassette, 4...Second paper feed cassette, 5...Copy tray, 29.
29' ... Conveyance direction control roller, 40, 40
'...Reversing roller, 44. '44'...
...Discharge roller, A... Copy paper. Applicant: Junya Suzuki, Patent Attorney, Mita Kogyo Co., Ltd.

Claims (1)

[Claims] Conveying direction control AL roller 29 that conveys the copy paper A supplied from the first paper feed cassette 3 and having an image transferred and fixed on one side in a commanded direction based on a command signal.
, 29' and the conveyance direction control rollers 29, 29'
A return route 33 that returns the copy paper A fed in toward the second paper feed cassette 4;
The copy paper A fed through the cassette 4 is inverted so that the image is transferred to the other side.
reversing rollers 40, 40' that feed the copy sheet A to the copy receiver 11115, and ejection rollers 44, 44' that eject the copy paper A that has undergone image transfer T to the copy receiver 11115. : By rotating the conveyance direction control rollers 29, 29' in the normal direction according to the command signal, the copy paper A is sent to the retraction belt 33, and further the conveyance direction control rollers 29, 29' are rotated in the normal direction. The discharge rollers 44 and 44' are also rotated in the opposite direction faster than the rotational speed of the conveyance direction control roller 2.
A copy paper conveying device for a copying machine capable of quickly feeding the copy paper A to the copy tray 5 without sending it to the return route 33 by rapidly rotating it in synchronization with the reverse rotation of 9 and 29'. .