JPS60159759A - Both face copying machine - Google Patents

Abstract

PURPOSE:To improve the capacity of both faces copying and make a device compact by providing the first carrying path, where an image is copied on one face of a copy paper, under a photosensitive drum and providing the second carrying path, where an image is copied on the other face of this copy paper, above the photosensitive drum. CONSTITUTION:A copy paper P where no images are copied on both faces is supplied from a paper supply cassette 3 and is carried on the first carrying path A. An image is copied on one face by a corona discharger 13 for transfer and is fixed by a fixing device 21. The fixed copy paper passes on a switching device 22 and is held between carrying direction control rollers 23 and 23', and the front end part of the copy paper is received on a single face copy temporary saucer by normal rotation of these rollers. For the purpose of copying an image on the other face, the switching device 22 is turned by a command signal to rotate reverse carrying direction control rollers 23 and 23'. Then, the copy paper is carried on the second carrying path B, and an image is transferred to the other face and is fixed, and the copy paper is sent onto a copy saucer 5. Thus, the capacity of both faces copying is improved, and the device is made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a copying machine, and particularly to a copying machine capable of copying both sides of copy paper.

(Prior Art) Conventionally, copy paper used to copy objects such as manuscripts has been copied only 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. As a result, it could not be adapted to a small desktop type machine.

(Structure and Object of the Invention) Therefore, the present invention provides a paper feed cassette 3 on one side of the copying machine 1.
and a copy ejector 5 are disposed, and a one-sided copy temporary tray 4 is disposed on the other side. The photosensitive drum 10 is disposed between the first conveyance path A and the first conveyance path A, and conveys the copy paper p from the one-sided copy temporary tray 4 toward the copy ejector 5. a second conveyance path B, a corona discharger 13 for transferring an image from the photosensitive drum 10 onto one side of the copy paper p in the middle of the first conveyance path A;
The copy paper p sent from the conveyance path A is sent onto the one-sided copy temporary tray 4, and the one-sided copy 0-temporary tray 4
When reversing the upper copy paper p without reversing it,
A switching device 22 that switches the copy paper p on the one-sided copy temporary tray 4 to the second conveyance path B side, and a switching device 22 that switches the copy paper p on the one-sided copy temporary tray 4 to the second conveyance path B side; By providing a double-sided copying machine equipped with a charging/transferring corona discharger 11 for transferring an image onto the other side of the page, a double-sided copying machine that is capable of double-sided copying, is compact, and has improved performance is obtained. The main purpose of this is to

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

FIG. 1 is a simplified cross-sectional view of a copying machine that copies only one side, and FIG. 2 is a simplified cross-sectional view of a copying machine that copies the other side after it has been reversed.

In the figure, reference numeral 1 denotes a machine frame of a copying machine, and a transparent plate 2 on which a document is placed horizontally is provided above the frame. The paper feed cassette 3 that stores the copy paper p is installed approximately below the right end of the frame 1 shown in FIG. A copy ejector 5 for ejecting paper is provided, and a copy ejector 5 is provided at the left end of the machine frame 1 opposite to the paper feed cassette 3 for temporarily receiving copy paper with copies already made on one side and feeding the other side. A one-sided copy temporary tray 4 is attached.

A photosensitive tom 10 whose entire circumferential surface is coated with a photosensitive layer (not shown) is rotatably mounted approximately in the center of the machine frame 1 of the copying machine, and the original on the transparent plate 2 is rotated. The light projected and reflected by the movable reflecting mirrors 6, 7 . The image of the document is projected onto the photosensitive layer through the in-mirror lens 8 and the reflecting mirror 9 to form an electrostatic image on the photosensitive layer. Around the photosensitive drum 10, there is a charging/transfer corona discharger 11, which has the function of charging the photosensitive layer and transferring the other side of the copy paper that has been copied on one side, and a static charger formed on the photosensitive layer. A developing device 12 has a cleaning function by visualizing the electrostatic latent image into a toner image and removing toner remaining on the photosensitive layer after transfer, and copies the toner image formed on the photosensitive layer. A transfer corona discharger 13 for transferring onto paper is arranged. 17.17', 19. '
Reference numeral 19' denotes a conveying roller that conveys the copy paper p pushed up by the lever 14 and fed by the paper feed roller 15 to the photosensitive drum 9 1O for single-sided copying.

Further, 16.16' is a guide plate provided between the paper feed roller 15 and the transport rollers 17, 17', and 18.18' is a guide plate provided between the transport rollers 17, 17' and the transport rollers 19, 19'. It is. Reference numeral 20 denotes a fixing device 2 for transferring the copy paper onto which one side has been transferred by the transfer corona discharger 13.
The conveyance to No. 1 is route.

The copy paper, which has been heat-fixed by the fixing device 21 and has been transferred on one side, is temporarily received in the temporary one-sided copy tray 4. Reference numeral 22 denotes a first conveyance path A that conveys the copy paper p from the paper feed cassette 3 toward the single-sided copy temporary tray 4; Conveyance path B
This is a switching device that switches to

This switching device 22 has a substantially triangular shape, is pivoted by a pivot shaft 22a, and is rotatable about the pivot shaft 22a in response to a command signal, and when rotated in the horizontal direction as shown in FIG. The single-sided copy paper sent out from the fixing device 21 passes through the switching device 22 and is transferred to the temporary single-sided copy tray 4.
Take the first conveyance path A toward . On the other hand, when the switching device 22 is rotated upward, that is, when the oblique side portion 22b is rotated in a direction facing the fixing device 21, as shown in FIG. , and takes a second conveyance path B from the single-sided copy temporary receiving tray 4 to the copy ejection tray 5. Conveying direction control rollers 23, 23' are disposed between the switching device 22 and the single-sided copy temporary tray 4, and transfer the single-sided copy paper that has been sent out from the fixing device 21 and passed over the switching device 22 to one side. Copy temporary tray 4
It can be rotated so as to send it toward the switching device 22 (hereinafter referred to as forward rotation), or rotated so as to move backward toward the switching device 22 (hereinafter referred to as reverse rotation).

Above this switching device 22 are conveyor rollers 24°24',
26, 26', 28, 28', 30, 30
'.

32.32', but there is a guide plate 2 between these conveyor rollers.
5, 25', 27, 27. ', 29, 29'
, 31.

31', respectively, and the copy paper switched by the switching device 22 to take the second conveyance path B is generally conveyed to the upper surface of the photosensitive drum 9 and the photosensitive drum 10 by these conveyance rollers, the other side is transferred, and the copy sheet is conveyed. The copy paper is conveyed to a fixing device 34 by a belt 33, and fixed by the fixing device 34.
5', the image is copied and discharged onto the folding tray 5. That is, the first transport path A for copying one side is located below the photosensitive drum 10, and the transport path B for copying the other side on which one side has been copied exists above the photosensitive drum 10.

To explain double-sided copying of copy paper using the double-sided copying machine with the above configuration, paper is fed from the paper feed cassette 3 by a roller 15 as shown in FIG. This fed copy paper is transferred to a pair of guide plates 16 and 16' and a conveyance roller 17.
, 17', guide plate work 8, 1g, and then conveyor roller 19
, 19', the photosensitive drum 9 is fed into close contact with the photosensitive layer of the drum 10, and one side is transferred by the transfer corona discharger 13. After one side of the copy paper has been transferred, the copy paper is conveyed by a belt 20 to a fixing device 21 where it is fixed.

The fixed copy paper passes over the switching device 22 and is held between the conveyance direction control rollers 2'3 and 23'.

Ru. Since this switching device 22 is rotated in parallel to the conveying direction of the copy paper, the copy sheet that has been copied on one side passes over the switching device 22 and is held by the conveying direction control rollers 23° 23', which controls the conveying direction. By the forward rotation of the rollers 23° 23', the front end of the copy paper P is temporarily received in the one-sided copy temporary tray 4, and the rear end of the copy paper P is transferred to the transport direction control roller 23.
, 23'. That is, the paper feed cassette 3
One side of the copy paper is copied by taking the first guide path A that conveys the copy paper p from the first side toward the one-sided copy temporary tray 4.

Next, in order to copy this other side which has not been copied yet, the switching device 22 is rotated upward about the pivot shaft 22a in response to a command signal, that is, in a direction in which the oblique side portion 22b faces the fixing device 21. That is, it is displaced to the position shown in FIG. Then the transport roller control roller 23. ．． 23' is rotated in the reverse direction, the front end is temporarily received in the one-sided copy temporary tray 4, and the one-sided copied copy paper p, whose rear end is held between the conveyance direction control rollers 23, 23', moves backward. The other side of the copy paper p is guided to conveyance rollers 24 and 24' which are in contact with the switching device 22 and are branched and disposed vertically upward, and the other side of the copy paper p is transferred from the temporary copy tray 4 to the copy discharge tray 5. Transport path B for copying the side is taken. Conveyance roller 24
, 24', the copy paper is guided to the guide plate 25, 25',
Conveyance rollers 26, 26', guide plates 27, 27', conveyance rollers 28, 28', guide plates 29, 29', conveyance rollers 30, 30', guide plates 31°31', and then conveyance rollers 32, 32'. , where the copy paper is positioned on the upper surface of the photosensitive drum 9 and the other side, which has not yet been copied, faces the photosensitive drum. The conveying rollers 32 and 32' then feed the copy paper so that it comes into close contact with the photosensitive layer of the photosensitive drum 10, and the charging/transferring corona discharger 11 transfers the other side that has not yet been copied. The copy paper on which the other side has been transferred is conveyed by a route 33 to a fixing device 34 where it is fixed, and after completion of fixing, the copy paper is ejected and conveyed by ejection rollers 35, 35'. In this way, double-sided copying can be completed.

(Effects of the Invention) 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 is efficient. becomes.

In addition, there is no need to provide a second cassette for copying the other side, and double-sided copying of copy paper can be completed by using only one paper supply cassette for copying one side. Problems such as paper jams that sometimes occur are reduced.

Furthermore, since an auxiliary machine frame is not required to invert and return the copy paper, it is possible to manufacture a compact double-sided copying machine, which has advantages such as making the copying machine inexpensive.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a simplified cross-sectional view of a copying machine in a state where only one side is being copied, and FIG. It is a similar simplified sectional view. 3...Paper feed cassette, 4...Single-sided copy temporary tray, 5...Copy ejector, 10...Photosensitive vilam, 11...・Corona discharger for charging and transfer, 13...
...Transfer corona discharger, 22...Switching device) A...First conveyance path, B...Second conveyance path, p... ...copy paper. Applicant: Junya Suzuki, Patent Attorney, Mita Kogyo Co., Ltd.

Claims (1)

[Claims] A paper feed cassette 3 and a copy ejector 5 are disposed on one side of the copying machine 1, and a one-sided copy temporary tray 4 is disposed on the other side l, and the one-sided copy is transferred from the paper feed cassette 3 to the copy ejector 5. The first conveying copy paper p toward the temporary tray 4
A photosensitive drum 9 is disposed between the transport path A of the first transport path A and the first transport path A, and a photosensitive drum 9 is disposed with a drum 10 interposed between the transport path A and the first transport path A. a second conveyance path B for conveying; a corona discharger 13 for transferring an image from the photosensitive drum 10 onto one side of the copy paper p in the middle of the first conveyance path A; When sending the copy paper p fed from the conveyance path A onto the one-sided copy temporary tray 4 and reverse the copy paper p on the one-sided copy temporary tray 4 without reversing it, the one-sided copy temporary tray 4 a switching device 22 that switches to send the upper copy paper p to the second transport path B side; and a switching device 22 that switches to send the upper copy paper p to the second transport path B
A double-sided copying machine equipped with a charging/transfer corona discharger 11 for transferring an image from the photosensitive drum 10 onto the other side of the copy paper P in the middle of the process.