Image forming apparatus for forming a plurality of page images formed on one side of sheet on both sides of sheet

An image forming apparatus comprising:

• image forming means 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, lower left, upper right, and lower right of the sheet, and forming images of four other pages on the back side of the sheet;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in a first mode of fastening or to fasten the longer side of the sheet and in the case of a portrait image or in a second mode of fastening or to fasten the shorter side of the sheet and in the case of a landscape 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, and in said first 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-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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for forming a portrait image, comprising:

• image forming means 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;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in a first mode of fastening or to fasten the longer side of the sheet, 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 in a second mode of fastening or to faster the shorter side of the sheet, 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for forming a portrait image, comprising:

• image forming means 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, lower left, upper right, and lower right of the sheet, and forming images of four other pages on the back side of the sheet;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in a first mode of fastening or to fasten the longer side of the sheet, 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, and in a second mode of fastening or to fasten the shorter side of the sheet, 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for forming a landscape image, comprising:

• image forming means 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;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in a second mode of fastening or to fasten the shorter side of the sheet, 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 in a first mode of fastening or to fasten the longer side of the sheet, 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for forming a landscape image, comprising:

• image forming means 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, lower left, upper right, and lower right of the sheet, and forming images of four other pages on the back side of the sheet;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in a second mode of fastening or to fasten the shorter side of the sheet, 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, and in a first mode of fastening or to fasten the longer side of the sheet 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for performing transportation from a long edge of a sheet as a leading edge, comprising:

• image forming means 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;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in the case of a portrait 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 in the case of a landscape 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for performing transportation from a long edge of a sheet as a leading edge, comprising:

• image forming means 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, lower left, upper right, and lower right of the sheet, and forming images of four other pages on the back side of the sheet;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, 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, 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for performing transportation from a short edge of a sheet as a leading edge, comprising:

• image forming means 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;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, 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 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.

An image forming apparatus for performing transportation from a short edge of a sheet as a leading edge, comprising:

• image forming means 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, lower left, upper right, and lower right of the sheet, and forming images of four other pages on the back side of the sheet;
• storage means for storing an image to be formed by said image forming means;
• and
• control means for controlling to store images in said storage means, in the case of a landscape 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, and in the case of a portrait 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,
• wherein said image forming means forms the images in said storage means located by said control means, on the sheet.