JPS59224852A - Transfer paper conveying device of both-surface copying machine - Google Patents

Abstract

PURPOSE:To take an automatic both-surface copy of a one-surface sheet original at a high speed by exposing only odd-numbered pages firstly and then odd- numbered pages, and controlling the conveyance of sheet originals so that they are stacked according to pages when discharged. CONSTITUTION:For example, originals S1-S4 are stacked on an original supply table 14 in order, and the original S1 is fed and exposed. While the original S2 is stopped temporarily in an auxiliary passage 22, the original S3 is exposed and then enqueued in an auxiliary passage 24 to expose the original S2; and the original S4 is fed and exposed a specific time after the sheet original S2 is fed. The picture of the original S1 is transferred to the 1st surface of transfer papar P1 by a transfer device 37, and transfer paper P2 is fed a specific time later to form the picture of the original S3 on the 1st suface and sent in a paper feeder 44. Simultaneously, the picture of the original S2 is formed on the 2nd surface of the transfer paper P2, and the picture of the original S4 is formed on the 2nd surface of the transfer paper P2 successively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic double-sided copying device, and more particularly to the conveyance of transfer paper in a double-sided copying device that forms an image of the original on both the front and back sides of the transfer paper from a single-sided sheet original. .

In general, a double-sided copying device places the original f11- on the document table and exposes it to make a copy on the first side of the transfer paper, and then turns the document over or transfers another document to the document table I. It is known that a double-sided copy is obtained by placing the transfer paper on the second side of the transfer paper and exposing it to light in the same manner.

By the way, the types of manuscripts include books with images formed on the front and back sides of a single sheet of paper, double-sided manuscripts in the form of individual sheets (K), and sheet-like double-sided manuscripts. There are various types of originals, such as so-called single-sided sheet originals in which an image is formed on only one side. The most suitable copying method can be considered depending on the type of document.

Recently, there has been a strong demand for quick copying or to complete copying in a short time. Among the above-mentioned originals, sheet originals in particular are handled in a different way than thick originals, and the copying speed is greatly improved. -1- It has been said that

That is, a thick original is placed on a fixed or reciprocating original platen, and sheet originals are passed through a sheet conveying device exclusively for sheet originals to be copied. Methods have been proposed to simplify processing and improve copying speed.

For example, a double-sided copying apparatus as shown in FIG. 1 has been proposed. Code l is manuscript 4+! 2 indicates a sheet document conveying device, and 3 indicates a sulin 1-exposure optical system. The original placed on the original platen 1"- is ] : +
The light is exposed by the exposure optical system 3, which is composed of two 11-movement reflecting mirrors 4 and 5 that move at a speed ratio of /2.・When the side sheet original is in sheet 1-original copy mode 1~, the original table provided in the second part of the copying machine supporting sheet 1~original transport device 2 moves to the left and becomes ready for copying. Seat/
The original l'IlI+ is transported by the transport device 2. Exposure is performed during the transport.

・On the other hand, the transfer paper is fed from the cassette 6, a henna image is formed on the surface of the transfer paper by transfer, and is fixed by the fixing device 7. Passage to! ], the paper is again fed toward the photosensitive tram 10 according to the next paper feeding command, a 1-ner (fit) is formed on the back side of the transfer paper, and duplex copying is completed.

However, even if you try to perform high-speed copying to sheet 1 using the sheet document 1 general feeding device 2 exclusively for originals, if the transfer paper is not processed in a way that can keep up with the processing speed of the sheet document, You cannot expect instant results. That is, in the figure, in order to form a toner image on the front surface of the transfer paper and feed the paper again toward the photosensitive drum 10 to form an image on the back surface, the direction changing device 8 of the sheet 1 to The formation of the next image on the photoreceptor 1 (ram) is limited by the time it takes to convey the photoreceptor 1 by the same distance and then further convey it from the resist 1 to the roller 11. In addition, instead of the type of copying device shown in Figure 1, which completes double-sided copying on transfer paper one by one and discharges it outside the machine, it copies many sheets at once on one side of transfer paper. It has also been proposed to perform high-speed copying without the above-mentioned problems by temporarily storing the data in a paper feeder, and then completing the copying on the other side. However, in this copying system as well, the copies ejected to the paper ejection tray are ejected and stacked in page order and in an orderly manner so that they can be bound or bound immediately.
n-l' (7) There is not much difference in time. It is also possible to include a device such as a collator, but this would increase the size of the device and increase the 4-1i11i rating, which is not preferable.

The present invention aims to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide a transfer paper conveying device for high-speed automatic double-sided copying that forms original images from a single-sided sheet 1 to the original on both the front and back sides of transfer paper. This is the purpose.

In FIG. 2, a movable document table 12 is provided at the top of the main body H of the copying machine and moves back and forth during exposure, and is normally stopped at the position shown in the figure. On the left side of the copying machine main body 11, a sheet document transport section 13 dedicated to sheet documents is provided. Paper roller 15, first switching means 16
, a sheet document exposure section "-1", which is composed of a second switching means 17, a paper discharge roller 18, a paper discharge 1 to 19, and a plurality of transport rollers 20t to 20c1. - A sheet original passage 21 and a first sheet original passage formed in parallel with each other between the original supply table 14 and the exposure section 1C
It is configured to selectively supply sheet originals to the auxiliary passage 22, and the direction 2 switching means 17 connects the sheet original passages 23 formed in parallel to each other between the exposure section, the discharge section I, and the sheet 19. and the second auxiliary passage 24 are configured to selectively supply sheet originals.

The exposure optical system 25 includes illumination devices 26 and 27 and a reflecting mirror 2L29.
゜30, 31.32a, 32b, 32c, etc. It is composed of lenses 33, etc., and when copying the original in 2-, the reflecting mirror 31 and the reflecting mirror 32b are placed in the position shown by the dotted line in the figure. The moving light image illuminated on the illumination device 26 passes through the reflecting mirrors 28 and 30, passes through the lens 33, passes through the reflecting mirrors 32 and 32c, and enters the photoreceptor tram 3.
・Achieve 1.

On the other hand, when copying the original to the sheet 1, the reflecting mirror 31 and the reflecting mirror 3
2b is fixed at the solid line position, the illuminating device 27 is energized to illuminate the document, and the light image is transmitted to the reflecting mirrors 28, 29, . : 11, passes through the lens 33, passes through the reflecting mirror 32a, and passes through the photoreceptor 34.
arrive at. The light rays reflected by the reflecting mirror 31 are also arranged so that the incident optical path to the light ray lens 33 that is reflected by the reflecting mirror 30 is common.

Around the photoreceptor drum 1134, there are a charging device 35, a coloring device 36, a transfer device 37, a separation device 38, a cleaning device 39, and a static eliminator! if, 4 (1 is arranged respectively.

Here, regarding the case where images corresponding to, for example, the original S1 on the front side and the original S2 on the back side are formed on both sides of the transfer paper 1 from the single-sided sheet originals S1 to S4, and a double-sided copy of the following combinations S and S4 is obtained. explain.

Documents S1 to S4- are stacked on the single-sided sheet 1 in page order with the screen oriented in the order of S+, then S2, on the sheet document supply table 14'2. The paper feed roller 15 is activated by a copy command.
The second original sheet fIl'l1si is then rotated and transported to the exposure position E through the sheet passage 21. After exposure, the sheets 1 to MS+ pass through the sheet 1 path 23 and are discharged onto the discharge sheet 1 tray 19 with the screen facing upward.

Immediately after the sheet original S1 passes through the first switching stage 16, the first switching means 16 is moved to the dotted line (in the figure), and after a predetermined period of time, sheets 1 to S2 of No. 2 and No. 1 are fed. , the tip is held in the first auxiliary passage by a pair of rollers 205 and is temporarily stopped.

The first switching means 16 returns to its original position immediately after the sheet document S2 passes. In short, the first and second switching means +h, 17 are configured to be switched to the respective =7- positions after the sea 1- passes.

Next, the third and eleventh document S3 is fed, passes through the sheet path 21, passes through the exposure section E, and enters the second auxiliary path 24 with the leading edge of the sheet document S3 held in the conveyance roller 2011 at 1 o'clock. Stand still and wait.

When a predetermined period of time has passed after the sheet original S3 passes through the exposure section E, the conveyance roller 20 resumes rotation, and the sheet original S2
starts feeding, sends it to the exposure section E, and discharges it through the sheet path 23].The sheet is stacked on top of the first document S1 on the sheet 19 with the screen facing downward.

When the sheet original S2 is discharged, the transport roller 2011 resumes rotation, transports the sheet original S, and stacks the sheet original S2 on the sheet discharge I/sheet 19 with the screen facing downward and discharges it. The sheet original S4 is fed after a predetermined time period has elapsed since the sheet original Sλ was fed.

If the feeding of the sheet originals is controlled so that the exposure time intervals of the sheet originals SL to 34 are constant, the feeding control of the transfer paper becomes simple.

By repeating the above operations, sheet originals are discharged to the paper discharge tray 19'2 in page order.

8- Next, the movement of the transfer paper will be explained. Masu cassette 41
The uppermost transfer paper (P) inside the inner transfer paper is 16 pieces drum 3
The sheets are fed in synchronization with the images of Sheets 1 to S (S) formed on 4.

Transfer paper 13. The transfer device 37 transfers the "2" image onto the first side of the image, the separating device 38 consisting of an AC corona discharger separates the transfer paper P1 onto the photoreceptor 1 along with the ram 34, and the fixing device 42 transfers the toner images 1 to 1. fixed thereon, the switching means 4
3, the transfer paper 1 is fed into the second paper feeding device 44, and the first side of the transfer paper 1 is placed in a state where it is ready to be fed again from the trailing edge in two directions.

Transfer paper 1 in cylinder 2 after a predetermined time has elapsed since transfer paper number 1 was fed.
” 2 is fed in the same way, and the document S3 is placed on the first side of sheet 1.
An image corresponding to the paper is formed and sent to the second paper feeder 44 by the switching device 43 as well. Second transfer paper IJλ
Before the transfer paper is fed, the transfer paper is placed on the photoreceptor 1 and ram 3.
Images corresponding to sheets 1 to S2 are formed on the second side of the transfer paper 1-1. That is, transfer paper p +
Images corresponding to the originals sI and s2 are formed on the front and back sides of the sheet 1, respectively. The transfer paper 1'1 is discharged onto a paper discharge tray 45'' with the first side facing downward. Following the feeding of transfer paper PI, transfer paper 1]2 is also sent out, and transfer paper 1
An image corresponding to sheet 1 to document S is formed on the second surface of the document 32. The transfer paper P2 is also discharged onto the paper discharge tray 45''2 with its first side facing up, and is stacked on top of the transfer paper P+. Therefore, the transfer sheets are stacked correctly in page order.

'' In the case of the dual-unit device, we have explained the case where there are four single-sided originals, but in the case of five or more sheets, only the odd-numbered pages are exposed first, then the even-numbered pages are exposed all at once, and then the documents are ejected. When printing sheets, the conveyance of sheet documents is controlled so that they are stacked in page order. Alternatively, the above-mentioned copying operation for up to four sheets may be repeated in one 11-position.

If you want to make multiple double-sided copies from a sheet original, the sheet originals stacked on trays 1 to 19 in FIG.
4 and repeating this process until the desired number of sheets is reached. In Fig. 2, exposure of Sheet 1 to the original is performed using exposure method to the Surin 1 where the exposure optical system 25 is fixed and the sheet original is moved. In order to obtain a document, it is preferable to use a type in which the sheet 1 to original is fixed and the optical system scans it because it reduces the chance of damaging the sheet 1 to the original.

FIG. 3 shows a general feeding system for sheet originals of a type in which a sheet original is fixed to an exposure section and subjected to slit exposure. Reference numeral 46 indicates sheet 1 to document supply table, 17 indicates paper feed roller, 48 indicates first switching device, 49 indicates sheet document path, and 50
51 is the first auxiliary passage, and 51 is the sheet conveyance bell 1 to . Reference numeral 52 indicates a second switching device, 53 indicates a sheet document path, 5.1 indicates a second auxiliary path, and 55 indicates paper discharges 1 to 5, respectively.

Since the sheet original is conveyed by the method explained in FIG. 2, a detailed explanation thereof will be omitted. The original to the sheet 1 that has reached the exposure section E is temporarily stopped on an original table 56 made of a glass plate, and then the original is scanned to the slide 1 by the exposure optical system 57. When the exposure scan is completed a predetermined number of times, the sheet conveyance bells 1 to 51 resume rotation and send out the sheets 1 to originals. When copying a thick original, the sheet original conveying belt 51 is attached to the main body of the copying machine so as to be openable and closable, and the thick original is placed on the original placing table 56 for exposure.

In such a type of copying machine that produces a large number of double-sided copies from a single-sided sheet original, the transfer paper must be conveyed efficiently.

FIG. 4 shows a schematic diagram of a transfer sheet conveying device particularly suitable for a copying machine having a document conveying device for sheet 1 shown in FIG.

A case will be described in which images corresponding to sheet original S+ and sheet original S2 are formed on the surface of transfer paper and a large number of copies of these are made simultaneously.

First, in FIG. 3, a sheet original SI is placed on an exposure section E and exposed and scanned a plurality of times. As shown in FIG. 4, in conjunction with this exposure operation, transfer paper is sequentially fed from the paper cassette 58 for the number of exposures, an image corresponding to the sheet original S1 is formed on one side of the transfer paper, and the first intermediate Power set 1-
59 with the image side facing upward.

-12=Next, the third sheet original S is exposed. At this time as well, -F paper feeding force sets 1 to 58 or IEJ transfer paper are sequentially fed, images corresponding to sheets 1 to original S5 are formed on one side of the transfer paper, and the second intermediate force set 1 to 58 is fed. The images are loaded with the image side facing -1-. At this time, the switching device 61 has switched to the dotted line position, and the switching device 62 is in the solid line position and guides the transfer paper to the second intermediate force set 1.

Next, the sheet original Sλ is exposed, and in response to this, the transfer paper is re-fed from 59 to the first intermediate force set 1, an image corresponding to sheet 1-original S2 is formed on the other side, and the sheet is placed on the output tray. 63
The first sheets 1 to S+ are stacked one after another with their images facing down. Thereafter, sheets 1 to S4 are exposed to light, a transfer sheet is fed from the second intermediate cassette 60, an image corresponding to the sheet original S4 is formed on the other side, and the sheet/original is discharged to sheet 63. It is loaded with the S3 image facing down. Thereafter, such operations are repeated to complete the double-sided copying operation.

Odd-numbered pages are stacked on the output tray 63 in page order (when the sheets are taken out from the output tray and placed face down), so it is extremely easy to handle the transfer paper after copying. . The paper feed rollers 64 and 65 provided in the first and second intermediate cassettes 59 and 60, respectively, are in the operating position shown when feeding the transfer paper from the force cellar l~, or the transfer paper is not transferred. After the operation is completed, when the transfer paper is fed into the case 1, it must be retracted to a position that does not prevent the transfer paper from entering, that is, a non-operating position.

In addition, in order to avoid feeding the single-sided sheet document with the paper feed roller in contact with the image surface, for example, as shown in FIG. -1~Document feed table 461- You can feed sheet originals in the reverse order of the page order so that the image surface of the first page is facing downward (a).v)°Paper 1 hessy 5
This is convenient because the sheets are sequentially discharged onto the sheet 5 in the reverse order of the page order with the image side facing upward, and finally the sheet 1-original is stacked in page order.

As mentioned above, according to the present invention, double-sided copying is efficiently performed when multiple copies are made from the same original, and the copies are stacked in order on the discharge trays 1 to 1. It is easy to handle copies.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional double-sided copying machine, FIG. 2 is a schematic diagram showing an example of a double-sided copying machine in which the present invention is implemented, and FIG. 3 is a schematic diagram of sheets 1 to originals suitable for implementing the present invention. FIG. 4 is a cross-sectional view of a transfer paper feeding and discharging device showing an embodiment of the present invention. 58... Paper feed cassette, 59... First intermediate force set, 60... Second intermediate force set 1-161. ．． 62
... Passage switching device, 63 ... Paper ejection tray, 6.1
．． 65...Paper feeding means.

Claims (1)

[Claims] In a double-sided copying machine that copies from an original to both sides of transfer paper to one-sided sheet 1 of continuous pages, the paper is fed from the paper feed cell h (58) that stores the transfer paper and this paper feed cell I. is,
Paper is fed from the first intermediate force set 1 to (59) that sequentially stacks the transfer paper onto which the image corresponding to the first sheet original has been transferred, and the paper feed force cera 1 to 1 to correspond to the third sheet original. The transfer paper in the first intermediate cassette is loaded in sequence from the second intermediate force set 1-(6f+) to the transfer section of the photoreceptor. a conveyance path for conveying the transfer paper in the second intermediate cassette l- from the second intermediate cassette toward the transfer section; " After the transfer paper has been fed to the second intermediate cassette, -]
A paper feeding means (ti4) feeds the transfer paper in the first intermediate cassette from the second intermediate power set 1 to the transfer section, and a paper feeding means (ti4) feeds the transfer paper from the first intermediate cassette to the transfer section. After that, a paper feed means (6) for feeding the white transfer paper from the second intermediate cassette to the transfer section (second intermediate force set 1)
5) and the transfer paper fed from the first intermediate case 1 to which the image corresponding to the second sheet original has been transferred, and the transfer paper fed from the brother 2 intermediate case 1- to the transfer paper 1t, the fourth sheet original The image corresponding to 4I5 is transferred and the transfer paper is loaded.
: On the output tray, the transfer paper that has passed through the transfer section -1- is transferred to the above-mentioned No. 1. A path switching device (61) for selectively feeding sheets to the second intermediate cassette,
62) and transfer paper (injection device).