JPH0423779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a double-sided document copying machine, and more specifically, an automatic circulation type double-sided document feeder (hereinafter referred to as an automatic document holder).
This invention relates to an improvement of a double-sided document copying machine consisting of an automatic double-sided copying device, a double-sided copy paper reversing device, and an output device (referred to as ADH).

For double-sided originals in conventional automatic double-sided copying machines
In ADH, when copying a double-sided original, the first original is first conveyed onto a platen, the first page is exposed, and then the original is reversed and the second page is exposed. When the exposure of both sides of the first document is completed, the document is further inverted and returned to the document tray of the ADH in order to restore the order of the pages of the document.
Thereafter, the second document (pages 3 and 4) and the third document (pages 5 and 6) are exposed and then reversed and returned to the document tray in the same manner. Therefore, a total of two countermovements are required when exposing the double-sided document and returning it to the document tray, which reduces the possibility of document jams.
There were many disadvantages in terms of work reliability, cost, etc.

Therefore, it is proposed to reduce the document reversing operation twice as described above to one operation, but in order to do so, when obtaining a double-sided copy from a double-sided original, the ADH of the first (or odd-numbered) copying operation of each original is required. When using and 2
The copy feeding path of an output device such as a copying machine or a sorter may be changed during the first (or even-numbered) use of ADH. The present inventor completed the present invention starting from such a technical idea.

That is, in the present invention, a document is sent from a document tray onto a platen, one side of the document is exposed, the document is reversed using a reversing roll, the document is sent to the platen again, the other side of the document is exposed, and this document is left as it is. An automatic circulation type double-sided document feeder that exposes a set of double-sided documents by repeatedly ejecting the document into the document tray and feeding the next document from the document tray; The toner image on the photoreceptor obtained by exposing and developing one side of the document is transferred to one side of the paper, and then the toner image on the photoreceptor obtained by exposing and developing the other side of the document is transferred to the other side of the paper. An automatic duplex copying machine equipped with a duplex copying tray that inverts the paper to transfer it to the paper, and a double-sided copying machine that inverts the double-sided copy paper sent from the automatic duplex copying machine before inserting the double-sided copy paper into an output device such as a sorter. This is a copying machine that has a double-sided copy paper reversing device used for double-sided copying, and an output device such as a sorter that finally processes the double-sided copy paper. In a copying machine that copies multiple copies of the same original by copying one set of originals and then repeating the process of copying one set of originals from that set of originals, the automatic circulation double-sided document feeder has a document tray. a detecting means for detecting the feeding of the last document out of a set of originals, and whether the double-sided copied paper reversing device is in a used state or a non-used state at the time of first copying of a set of originals; In addition, during the second and subsequent copying, the double-sided copied paper reversing device is switched between a use state and a non-use state each time according to a signal from the detection means of the automatic circulation type double-sided document feeder. The present invention provides a double-sided original copying machine featuring the following features.

The present invention will be explained in detail below with reference to Examples. An example of a copying system used in the copying method of the present invention is shown in FIG. In Fig. 1, 1 is the copying machine main body 10.
This is an automatic circulation type double-sided document feeder (ADH) attached to the ADH, which stores a series of documents 6 in a document tray 5 with the first page facing down. The document tray is equipped with a set separator 9, and when the first copying operation is completed, a sensor 26 (Fig. 3) detects the end of document feeding, and the inverter used to reverse the copy paper is activated. 22 is switched by the paper path switching mechanism 20 to prevent the second copy paper from being fed into the inverter. On the other hand, after the detection operation of the sensor 26, the separator 9 rotates once as shown in FIG. 3, and is automatically stored in the document tray after the first copying operation for the second copying operation. It stops when it touches the top page of a series of originals.

Photosensitive drum 11, developing device 12, cleaner 13,
A copying system consisting of a user 14, a paper feeder 15, a double-sided copying tray 16, and a copy paper path switching mechanism 17 is prepared to perform automatic double-sided copying, and the paper path switching mechanism 20 is set so that copy paper passes through an inverter 22. Switch. Next, when copying is started, the first page and second page of the first sheet of the original are exposed in order, and then processed and conveyed as shown in Fig. 2 → → and returned to the original tray. Unlike when the first document is placed in the tray, the second page is on the bottom side. Thereafter, copies of the second and third originals are made in the same manner, and the copies are taken out from the sorter bin 25 after copying is completed. When the first copying operation for making a predetermined number of copies is completed, the set separator 9 passes through the notch of the copying tray 5 and comes into contact with the sensor 26, as shown in FIG. A signal is issued to start the second copying operation. The manuscript used for the second copying operation is exposed in the order of the second page of the first sheet and the first page, and then the same process as in the first copying operation is performed, as shown in →→ in Figure 2. The first page of the original that is processed and transported and returned to the original tray is placed at the bottom, just as it was when it was placed in the original tray at the start of the first (odd-numbered) copying operation. becomes. In this second copying operation, the second page of the original is copied first, and then the first page is copied on the back side thereof. Therefore, at the same time as the second copying operation starts, the paper path switching mechanism of the inverter 22 is activated. 20 is switched so that the copy paper is not sent to the inverter but is transported directly to the sorter. Note that the second copying work is the same as the first copying work.
Preferably, the process is started after the first copy is removed from the sorter bin. In this way, the fourth and third pages of the second manuscript, the sixth and fifth pages of the third manuscript, and so on are copied in order, and the second (even-numbered) copying operation is completed. In this way, when starting the third (odd-numbered) copying operation following the second copying operation, the paper path switching mechanism 20 is activated so that the copy paper is guided to the inverter 22 in the same way as in the first copying operation. The third copying operation is completed by switching and performing the same operation as the first copying operation. Thereafter, the 4th, 5th, and so on, the odd numbered times are the same as the first time, and the even numbered times are the same as the 2nd time.
The copying operation can be carried out in the same manner as the second time, and the desired number of copies can be obtained. Note that if the number of copies is an odd number, including when the number of original copies is less than the number of sorter bins, the pages of the originals in the original tray will be in an irregular order when the ADH operation ends, so if the copying operation is performed an odd number of times, When the copying operation is finished with
It is a good idea to go back and restore the order of the sections in the manuscript.

In the above embodiment, ADH includes the first part of the manuscript.
In the copying system, the copies are stored with the page facing down, and in the duplex copying tray 16 with the copy side facing up, and the output device is a sorter. However, other examples are shown in FIG. show
In the ADH, the original 6 is stored in the original tray with the first page on the top side. When this ADH is combined with the copying system shown in Figure 1, the original 6 in the ADH is stored in the ADH during double-sided copying work. The transition is performed in the order of "solid line running → exposure → dashed line running → exposure → chain line running → original tray". On the other hand, in the sorter finisher, the use of the inverter is omitted for the first copying operation, and the use of the inverter is omitted for the second copying operation. An inverter may be used, and the inverters may be used alternately in the same manner. As another example, when the original is stored in the ADH with the last page facing down, the copy is stored in the double-sided copying tray with the copy side facing down, and the output device is a sorter finisher, finisher, etc. too
A similar effect can be achieved by alternately omitting the use of the inverter and using the inverter before the paper is conveyed to the output device in response to the even and odd copying operations of the ADH.

According to the method of the present invention, when obtaining a double-sided copy using a double-sided original, the original has to be reversed twice in one copying operation, whereas the original has to be reversed only once. Therefore, the occurrence of document jams, the reliability of copying operations are significantly improved, and machine failures are also reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a copying system used in the present invention, FIGS. FIG. 4 is a diagram showing another example of an automatic document feeder according to the present invention. Codes in the figure: 1... Automatic document feeder, 2... Platen transport, 3... Reversing roll, 4
... Return roll, 5 ... Document tray, 6 ... Document, 7 ... Sorting and sending roll, 8 ... Platen glass, 9 ... Set separator, 10 ... Copying machine main body, 11 ... Photosensitive drum, 12 ... ...Developer,
13...Cleaner, 14...Fuser, 15...
Paper feeder, 16...Double-sided copying tray, 1
7, 19, 20... Paper path switching mechanism, 18...
Catch tray, 21...Inverter roll,
22...Inverter, 23...Transport,
24... Indexer, 25... Sorter bin, 2
6...Sensor.

Claims (1)

[Claims] 1. Feed the document from the document tray onto the platen, expose one side of the document, then reverse the document using a reversing roll, send the document again to the platen, expose the other side of the document, and place the document as it is in the document tray. An automatic circulation type double-sided document feeder that exposes a set of double-sided documents by repeatedly ejecting the documents and feeding the next document from the document tray, and a paper feeder that feeds paper from a paper feeder and develops one side of the document after exposure. After transferring the obtained toner image on the photoreceptor to one side of the paper, the other side of the document is exposed and developed to transfer the obtained toner image on the photoreceptor to the other side of the paper. An automatic two-sided copying machine equipped with a tray for double-sided copying, and a double-sided copying machine that is used to reverse the double-sided copied paper sent from the automatic two-sided copying machine before it is inserted into an output device such as a sorter. A copying machine that has a copied paper reversing device and an output device such as a sorter that finally processes the double-sided copied paper, and when making multiple copies of one set of originals, one set of copies is made from one set of originals. In a copying machine that copies multiple copies of the same original by repeating copying from that set of originals one set at a time, the automatic circulation type double-sided document feeder has one set of originals in the original tray. a detecting means for detecting the feeding of the last document among the documents; the double-sided copy paper reversing device is placed in either a used state or a non-used state during the first copying of a set of documents; In the case of subsequent copying, the double-sided copy sheet reversing device is switched between a use state and a non-use state each time according to a signal from the detection means of the automatic circulation type double-sided document feeder. Manuscript copying machine.