Electrophotography – Machine operation – Job mode
Reexamination Certificate
1999-11-19
2001-06-05
Pendegrass, Joan (Department: 2852)
Electrophotography
Machine operation
Job mode
C358S001180
Reexamination Certificate
active
06243549
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image forming apparatus for forming a plurality of page images formed on one side of a sheet on both sides of a sheet.
2. Related Background Art
A conventional image forming apparatus has a 2-in-1 mode and a 4-in-1 mode and records images on the front and back sides of a recording sheet. The 2-in-1 mode copies two originals on the same side of one sheet, and the 4-in-1 mode copies four originals on the same side of one sheet.
The layouts of images formed after originals are stacked in a stacker of an image forming apparatus are shown in
FIGS. 21 and 22
which illustrate the directions of originals and sheet feed directions.
FIG. 23
illustrates the definitions of an original direction and a sheet feed direction. The original direction indicates whether an original placed in a stacker at a correct direction as viewed by a user positioned in front of the image forming apparatus, is vertically long or horizontally long relative to the arrow direction shown in FIG.
23
. The sheet feed direction indicates whether a long edge or short edge of a sheet is first fed.
FIG. 21
shows the positional relationship between images recorded on the both sides of a sheet in the 2-in-1 mode, and
FIG. 22
shows the positional relationship between images recorded on the both sides of a sheet in the 4-in-1 mode. In
FIGS. 21 and 22
, the sheet in the “front” column shows the state when viewed down to a paper ejection tray
2
. A bold line
3
shows a staple fastened with a stapler
4
. Originals are stacked in the order of 1, 2, 3, 4, 5, 6, 7, and 8 from the top to the bottom. If the numerals 1 to 8 are in the correct direction as viewed from a user, it is assumed that each original is placed at the correct direction.
However, both the sheets of originals copied in the 2-in-1 mode and the sheets of originals copied in the 4-in-1 mode are fastened by a single staple
3
. Therefore, these sheets can be turned over either on the vertical side or on the horizontal side. Assuming that the contents of a sheet on the front side are at the correct direction, the user cannot know at once which side is used to turn over pages. The user is required to check the correct turnover direction through a try and error basis.
In order to avoid this problem, the user adds another staple, resulting in a cumbersome work with possible errors.
If the contents of an original are written vertically, the copied images are disposed from the left to the right as the originals in the original stacker
1
are copied sequentially downward. Therefore, a user feels something different from the original images.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an image forming apparatus which can solve the above problems.
It is another object of the present invention to provide an image forming apparatus capable of smoothly reading a plurality of sheets recorded with original images like reading a book.
In accordance with one aspect of the invention there is provided an image forming apparatus with a method for forming images of four pages on the front side of a sheet, images of (8N−7)-th, (8N−6)-th, (8N−5)-th, and (8N−4)-th pages being formed respectively upper left, upper right, lower left, and lower right of the sheet, and forming images of four other pages on the back side of the sheet; a step of determining the arrangement locations of the plural images to be formed on the back side of the sheet, in a first mode of fastening or to fasten a longer side of the sheet and in the case of a portrait image or in a second mode of fastening or to fasten a shorter side of the sheet and in the case of a landscape image, so as to locate images of (8N−2)-th, (8N−3)-th, 8N-th, and (8N−1)-th pages respectively at the back sides of images of (8N−7)-th, (8N−6)-th, (8N−5)-th, and (8N−4)-th pages; and a step of determining the arrangement locations of the plural images to be formed on the back side of the sheet, in said first mode and in the case of a landscape image or in said second mode and in the case of a landscape image or in said second mode and in the case of a portrait image, so as to locate images of (8N−1)-th, 8N-th, (8N−3)-th, and (8N−2)-th pages respectively at the back sides of images of (8N−7)-th, (8N−6)-th, (8N−5)-th, and (8N−4)-th pages.
The other objects and advantages of the present invention will become apparent from the following detailed description when read in conjunction with the accompanying drawings.
REFERENCES:
patent: 4876562 (1989-10-01), Suzuki et al.
patent: 4995601 (1991-02-01), Ohashi et al.
patent: 5023658 (1991-06-01), Toyama et al.
patent: 5461459 (1995-10-01), Muramatsu et al.
patent: 5508798 (1996-04-01), Yamada
patent: 5530560 (1996-06-01), Nakajima
patent: 5768488 (1998-06-01), Stone et al.
patent: 5940543 (1999-08-01), Isemura et al.
patent: 5999767 (1999-12-01), Ando
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Pendegrass Joan
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