Sheet folding device

Patent metadata

Field	Value
Publication number	US-10196227-B2
Application number	US-201414546557-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 19, 2013
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A sheet folding device includes first and second folding rollers as a pair arranged on a sheet transfer path located downstream of a printing unit and configured to form a fold on a printed sheet. At least the first folding roller includes a small-diameter portion formed at a position corresponding to a range of a width of a separating roller in the sheet width direction, and a large-diameter portion formed at a position other than the position of the small-diameter portion.

First claim

What is claimed is:

1. A sheet folding device configured to perform a folding process on a printed sheet received from an image forming device that separates sheets loaded on a paper feed tray one by one between a separating roller and a separating member arranged along a sheet width direction of the sheet, transfers the sheet into a printing unit, and prints an ink image on the sheet in the printing unit, the sheet folding device comprising:
first and second folding rollers as a pair arranged on a sheet transfer path located downstream of the printing unit and configured to form a fold on the printed sheet,
wherein at least the first folding roller includes:
a small-diameter portion having a width substantially the same as a width of the separating roller in the sheet width direction, and
a large-diameter portion formed at a position other than the position of the small-diameter portion;

wherein the small-diameter portion is located on the first folding roller at a location corresponding to a center of the sheet width,
wherein the large-diameter portion has a uniform diameter.

2. The sheet folding device according to claim 1 , wherein upon one surface of the sheet that comes into contact with the separating roller being a print surface, the first folding roller is arranged on a side on which the first folding roller comes into contact with the print surface.

3. The sheet folding device according to claim 1 , wherein the first folding roller includes a single one of the small-diameter portions.

4. The sheet folding device according to claim 1 , wherein the small-diameter portion is formed only at a position corresponding to a range of the width of the separating roller in the sheet width direction.

5. The sheet folding device according to claim 1 , wherein
the large-diameter portion comprises two large-diameter portions in contact with a portion of the printed sheet other than a portion contacted by the separating roller; and
the small-diameter portion is continuously formed between the two large-diameter portions in the sheet width direction and is not in contact with the printed sheet.

6. A sheet folding device configured to perform a folding process on a printed sheet received from an image forming device that separates sheets loaded on a paper feed tray one by one between a separating roller and a separating member arranged along a sheet width direction of the sheet, transfers the sheet into a printing unit, and prints an ink image on the sheet in the printing unit, the sheet folding device comprising:
first and second folding rollers as a pair arranged on a sheet transfer path located downstream of the printing unit and configured to form a fold on the printed sheet,
wherein at least the first folding roller includes:
a small-diameter portion having a width substantially the same as a width of the separating roller in the sheet width direction, and
a large-diameter portion formed at a position other than the position of the small-diameter portion;

wherein the small-diameter portion is located on the first folding roller at a location corresponding to a center of the sheet width,
wherein the small-diameter portion has a uniform diameter.

7. The sheet folding device according to claim 6 , wherein upon one surface of the sheet that comes into contact with the separating roller being a print surface, the first folding roller is arranged on a side on which the first folding roller comes into contact with the print surface.

8. The sheet folding device according to claim 6 , wherein the first folding roller includes a single one of the small-diameter portions.

9. The sheet folding device according to claim 6 , wherein the small-diameter portion is formed only at a position corresponding to a range of the width of the separating roller in the sheet width direction.

10. The sheet folding device according to claim 6 , wherein the large-diameter portion comprises two large-diameter portions in contact with a portion of the printed sheet other than a portion contacted by the separating roller; and the small-diameter portion is continuously formed between the two large-diameter portions in the sheet width direction and is not in contact with the printed sheet.

Assignees

• Riso Kagaku Corp

Inventors

• Maeda Kunihiro

Classifications

• B65H45/147 Primary

  folding rollers therefor · CPC title

• B65H2601/10

  Ensuring correct operation · CPC title