JPH04340858A - Both-side copy picture generating device - Google Patents

Abstract

PURPOSE:To discharge paper in the order of page by placing an original face down, and using a mechanism which ejects the paper after inverting the face, at the time of a copy mode from one side to both sides. CONSTITUTION:At the time of the copy mode from one side to both sides, the original is turned over, and placed on an original placing tray 22. At the time of turning a start key ON, the original is carried from the bottom face, that is, the first page through carrying paths 24, 25, 26, 27, 28, 29, and 25, and set on an original stand glass 10 while the face is inverted. At that time, whether the page number of the original is the odd number or the even number is judged, and in the case of the odd number, the original is copied to a sheet material fed from a paper feeding cassette 14. And also, when the page number of the carried original is the even number, the sheet material carried to a lower carrying part is refed along a guide 9, and the original whose page number is the even number is copied to the back face. Then, the sheet material on both sides of which the original is copied is ejected on a paper ejecting tray 4 by the paper ejecting mode of a paper ejecting part 1.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a double-sided copying image forming apparatus,
Specifically, the present invention relates to an image forming apparatus such as a copying machine equipped with an automatic double-sided document feeder, for example.

0002

2. Description of the Related Art Conventionally, in a copying machine equipped with an automatic double-sided document feeder and a sheet conveyance path for double-sided copying, by setting a copy mode, the document stacking tray 22 is Copying can be performed automatically in the following four modes from a document set in . That is, (i) copying from a one-sided original onto one side of a sheet material (hereinafter referred to as "one-sided to one-sided copying").

(ii) Copying from a single-sided original to both sides of a sheet material (hereinafter referred to as "copying from one-sided to both-sided").

(iii) Copying from a double-sided original onto one side of a sheet material.

(iv) Copying from a double-sided original onto both sides of a sheet material. There are four modes. This automatic double-sided document feeder 21 sets a document with its surface facing upward on a document stacking tray 22, and when there are multiple documents, sequentially transports the documents from the bottom to the top of the document glass 10. It is. In other words, in one-sided to one-sided copying, when a document is set on the document stacking tray 22 with the document surface facing upward, the lowest surface of the document is fed by the paper feed roller 23, and then the document is transferred to the conveyance paths 24, 25, 26. As a result, the document is set at a predetermined position on the document table glass 10. And in the copier itself,
The scanner unit 11 reads the original on the original table glass 10 and applies the original to the sheet material fed from the paper feed cassette 14.
The image is transferred in the transfer section 8 , and after passing through the conveyance section 6 and the fixing device 5 , the sheet material is stacked on the paper discharge tray 4 by the paper discharge section 1 . The document whose image has been read is returned onto the document stacking tray 22 via the conveyance paths 27, 28, and 30.

In this way, by sequentially copying the bottom side of the original, multiple sheets of the original are copied from one side to the other, and the originals are placed on the output tray in the same order as the originals on the original stack tray. The sheets of paper are stacked with the copy side facing upward.

Furthermore, when copying a double-sided original (copying from double-sided to one-sided or from double-sided to double-sided), the original is transported from the original loading tray 22 onto the original platen glass 10 by the transport paths 24 and 25, and the front side is read. After finishing the document, the document is reversed by the conveyance paths 27, 28, 29, and 25, and then transferred to the belt 26 again.
The document is conveyed onto the document table glass 10, and the back side is copied.

[0008] Furthermore, when copying on both sides of a sheet material (copying from one side to both sides or from both sides to both sides), the sheet material on which the front side of the document has been copied is By switching, the sheet material is transported from the transport path 13 to the lower transport section 7 with the leading and trailing ends reversed without changing the orientation of the front and back surfaces. The sheet material in the lower conveyance section is fed again and sent to the transfer section 8 through the conveyance path 9.

[0009]

However, in the above-mentioned conventional example, when copying from a plurality of originals, copying starts from the last page of the original, so when copying from one side to both sides, the number of originals increases. You have to check whether it is an odd number or an even number. For example, if you have 6 manuscripts (
If the number of pages is even (even number), copying starts from the 6th page, and the number of pages (back-front) is (6-5), (4-3), (2-1).
Copying is performed on both sides of the three sheets in order so that. However, if the manuscript has 5 pages (odd number),
Start copying from the 5th page, and the number of pages (back - front) is (
-5), (4-3), and (2-1). In other words, if the original has an odd number of pages,
The sequence is such that the last page of the document, that is, the first copy sheet is not conveyed to the lower conveyance section, but is ejected as a one-sided copy.

[0010] As described above, in the case of copying from one side to two sides, the paper conveyance sequence of the copying machine body changes depending on whether the number of original sheets is odd or even. When you press the start key on a copying machine, before starting the copying operation, all originals on the original loading tray are sequentially fed and returned to the tray again, which checks the number of originals and determines whether the number is odd or even. judgment is being made.

[0011] In the one-sided to two-sided copy mode, this operation is always required before copying starts, and especially when the number of originals is large, time loss becomes large and productivity is reduced.

0012

[Means and effects for solving the problems] According to the present invention, when copying from one side to two sides, the document side is facing downward.
It is set in the automatic duplex document feeder, and when ejecting the copied sheet material from the copying machine, it can be switched between a mode in which it is ejected as is and a mode in which it is ejected with its front and back sides reversed. When a mechanism is provided to copy an odd number of single-sided originals onto both sides of a sheet material, only the sheet material on which the final original has been copied is turned over and ejected,
In other cases, by providing a control device that performs normal paper ejection, even when copying from one side to two sides, it is possible to measure the number of original sheets before the copying operation and determine whether they are odd or even. This eliminates the need for this, and can prevent a drop in productivity when copying from one side to both sides in a copying machine equipped with an automatic duplex document feeder.

[0013]

Embodiments Hereinafter, embodiments using the present invention will be described with reference to the drawings. FIG. 1 shows a cross section of a copying machine using a control device according to the present invention. Reference numeral 21 denotes an automatic double-sided document feeder, which has a conveyance path that sends the document on the document loading tray 22 onto the document glass 10 using guides 24 and 25, and reverses the document front and back using guides 27, 28, 29, and 25. It has a conveyance path and a conveyance path in which the original is returned onto the tray 22 by means of guides 27, 28, and 30. Further, in the main body of the copying machine, the sheet material sent out from the paper feed cassette 14 passes through the transfer section 8, the conveyance section 6, the fixing device 5, and is sent to the paper discharge section 1.

FIG. 2 is a cross-sectional view of a paper ejecting section having a mechanism for ejecting paper by reversing the front and back sides. Here, 2 is
Conveyance path switching flapper, (a) (b) (c)
It is controlled by a stepping motor (not shown) so that it can take three positions as shown in the figure. Reference numeral 3 denotes a pair of conveyance rollers whose forward and reverse rotation can be controlled by a stepping motor (not shown).

FIG. 2(a) shows a normal paper discharge state. The flapper 2 will be in the position shown in the figure.
The sheet material sent from the direction of arrow 15 is transferred to conveyance roller 1.
6 and 17, the paper is ejected onto the paper ejection tray 4.

FIGS. 2(b) and 2(c) show a mode in which the front and back sides are reversed and abolished. First, the sheet material sent in the direction of arrow 15 is sent in the direction of arrow 18 by the conveying roller 3 by setting the flapper 2 to the state shown in (b). Then, the rear end of the sheet material passes through the flapper position, and before passing the conveyance roller 3, the flapper 2
(c) Switched to the position shown in the figure, the conveying roller 3 changes its rotational direction in the direction of arrow 19. The sheet material is sent out in the direction of the arrow 20, and is discharged onto the tray 4 with the front and back sides reversed by the conveyance rollers 17.

FIG. 3 shows a paper discharge section configured as described above, and
1 is a flowchart of a control device according to the present invention that copies a plurality of single-sided documents onto both sides of a sheet material using a copying machine equipped with an automatic double-sided document feeder.

First, in the case of copying from one side to both sides, the document is placed on the document stacking tray 22 with its surface facing downward. By turning on the start key, the document is transported from the bottom side, that is, the first page, to the conveyance paths 24, 25, 26, 27.
, 28, 29, and 25, the document is turned over and set on the document table glass 10. At this time, it is determined whether the original is an odd-numbered sheet or an even-numbered sheet, and if it is an odd-numbered sheet, the original is copied onto a sheet material fed from the paper feed cassette 14. Here, it is determined whether or not there is the next original on the original tray 22, and if there is, the copied sheet material is turned over in the paper ejection section 1, passes through the transport roller 3, and is transported downward. The document is sent to section 7, and conveyance of the next document begins. If the conveyed document is an even-numbered document, the sheet material being conveyed to the lower conveyance section is re-fed according to the guide 9, and the even-numbered document is copied on the back side. The sheet material copied on both sides is then discharged onto the paper discharge tray 4 in the normal paper discharge mode of the paper discharge section 1 as shown in FIG. 2(a). Here, if there is no next document, the process ends; if there is, the next document is transported again.

[0019] Also, if the transported document is an odd-numbered document,
If the document is the final document, the copied sheet material is turned over and discharged onto the paper discharge tray in the modes shown in FIGS. 2(b) and 2(c).

FIG. 4 shows the sheets copied on both sides of the paper output tray 4 when the final original (third sheet) is copied when an odd number of single-sided originals (three sheets) are copied onto both sides of the sheet material. This diagram schematically shows the front and back conditions of the material. The sheet material with the first and second originals copied on both sides is ejected in the normal manner as shown in FIG. 2(a), so the first page is ejected facing downwards, as shown in FIG. . Next, when the sheet material on which the third original is copied is ejected in the normal manner as shown in FIG. 2(a), as shown in FIG.
), the third page is ejected with the copy side facing upward. Therefore, only the final manuscript (3rd page), Figure 2
(b) By using the front/back reversal paper ejection mode as shown in (c),
As shown in FIG. 4(a), the ejected sheets are stacked in the correct page orientation.

[0021]

Effects of the Invention As explained above, in the single-sided to double-sided copy mode, the number of originals can be reduced by placing the originals face down and using a mechanism that reverses them and discharges them. Regardless of whether the number is odd or even, the sheet materials copied onto the paper ejection tray can be ejected in page order.

That is, by performing such control, conventionally, when copying from one side to both sides, before the copying operation,
Since the operation of counting the number of originals, which was performed by the original document conveying device, is no longer necessary, there is no decrease in productivity when copying from one side to both sides.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a copying machine using a control device according to the present invention.

FIG. 2 is an enlarged view of the paper discharge section in FIG. 1;

FIG. 3 is a flowchart of a control device according to the invention.

FIG. 4 is a schematic diagram when the control device according to the present invention is used.

FIG. 5 is a sectional view of a conventional copying machine.

[Explanation of symbols]

1 Paper ejection section 2 Flapper for front and back reversal paper ejection 3, 16, 17 Conveyance roller 21 Automatic double-sided document feeder

Claims (1)

[Claims] Claim 1: A mechanism for automatically conveying a document onto a document table glass and reversing the front and back sides of the document conveyed on the document table glass, a scanner section for reading image information on the document, and a sheet. An image forming apparatus that has a printer section that forms an image on a sheet of paper, and a mechanism that turns the sheet material over when the sheet material is ejected from the printer section to the outside of the machine. An image forming apparatus characterized by having a control device that reverses and discharges the sheet material only when the sheet material on which the final original has been copied is discharged when the sheet material is copied on both sides of the sheet material.