Sheet processing device, image forming device provided with the same, and folded sheet pressing method

Patent metadata

Field	Value
Publication number	US-9919893-B2
Application number	US-201514750469-A
Country	US
Kind code	B2
Filing date	Jun 25, 2015
Priority date	Jun 30, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

Provided is a sheet processing device capable of preventing a folded sheet bundle from being opened after pressing to improve accumulating property and aligning property of the sheet bundle. A sheet processing device includes: a pair of sheet pressing members 70 that press a fold of a folded sheet bundle in a thickness direction of the fold; and a moving member 56 that moves the sheet pressing member pair 70 along the fold of the folded sheet bundle. The moving member 56 supports a plurality of rows of the sheet pressing member pairs 70 arranged in a moving direction of the moving member 56 . The sheet pressing member pairs 70 press the folded sheet bundle with the intervals therebetween in the respective rows reduced stepwise in the moving direction of the moving member 56.

First claim

What is claimed is:

1. A sheet processing device that presses a folded sheet bundle, comprising:
a plurality of pairs of sheet pressing members, each pair of sheet pressing members including an interval therebetween for sandwiching a fold of the folded sheet bundle and pressing the folded sheet bundle in a thickness direction of the folded sheet bundle; and
a moving member that moves the plurality of pairs of sheet pressing members along the fold of the folded sheet bundle, wherein
the moving member supports the plurality of pairs of sheet pressing members, wherein each pair of sheet pressing members is supported by the moving member in a row at a different position along a moving direction of the moving member,
the interval between each pair of sheet pressing members is regulated based on the position of each pair of sheet pressing members on the moving member, such that a first pair of the plurality of pairs of sheet pressing members has an interval larger than a next pair of the plurality of pairs of sheet pressing members, and
the moving member moves in the moving direction so that each pair of sheet pressing members forms another fold on the folded sheet bundle and simultaneously presses the fold of the folded sheet bundle.

2. The sheet processing device according to claim 1 , wherein
each pair of the plurality of pairs of sheet pressing members is a pair of pressing rollers, the each pair of pressing rollers being capable of being rotated in accordance with the moving direction of the moving member.

3. The sheet processing device according to claim 2 , wherein
the plurality of pairs of pressing rollers is supported in a plurality of rows in the moving direction and the plurality of pairs of pressing rollers includes a pair of pressing rollers in a last row and a pair of pressing rollers adjacent to the pair of pressing rollers in the last row, so that the pair of pressing rollers in the last row in the moving direction is elastically biased so as to be brought into pressure contact with each other, and
the pair of pressing rollers adjacent to the pair of pressing rollers in the last row is position-regulated so as to prevent the interval therebetween from becoming narrower than a predetermined interval.

4. The sheet processing device according to claim 3 , wherein
the plurality of pairs of pressing rollers supported by the moving member in the plurality of rows in the moving direction of the moving member is configured such that one roller of each pair of pressing rollers is disposed opposite the other roller of each pair of pressing rollers, with a position of the fold as a center, at positions substantially equally distant from the position of the fold.

5. The sheet processing device according to claim 4 , wherein
the plurality of pairs of pressing rollers includes a pair of pressing rollers in a first row, and
a movement of the moving member along the fold of the folded sheet bundle is continued from when the pair of pressing rollers in the first row in the moving direction overrides one end portion of the folded sheet bundle until when the pair of pressing rollers in the last row passes through another end portion of the folded sheet bundle.

6. The sheet processing device according to claim 5 , wherein
the interval of each pair of pressing rollers is regulated so that the interval between the pair of pressing rollers in the first row is defined as L 1 , the interval between the pair of pressing rollers adjacent to the pair of pressing rollers in the last row is defined as L 2 being narrower than L 1 , and the pair of pressing rollers in the last row pressure contacts each other.

7. An image forming device comprising:
an image forming unit that forms an image on a sheet; and
a sheet processing device that applies a predetermined sheet processing to an image-formed sheet from the image forming unit, wherein
the sheet processing device is the sheet processing device as claimed in claim 1 .

8. A sheet processing device that presses a folded sheet bundle, comprising:
a stacker section that accumulates sheets as a sheet bundle;
a folding roller that nips and folds the sheet bundle accumulated on the stacker section to form the folded sheet bundle with a fold;
a plurality of pairs of pressing rollers, each pair of pressing rollers having a first roller facing a second roller with an interval therebetween for sandwiching the fold of the folded sheet bundle formed by the folding roller, and pressing the folded sheet bundle in a thickness direction of the folded sheet bundle; and
a moving member with a frame that supports the plurality of pairs of pressing rollers, sandwiches the fold of the folded sheet bundle, and moves along the fold of the folded sheet bundle, wherein
the frame is arranged
to sandwich the fold of the folded sheet bundle between the plurality of pairs of pressing rollers, wherein each pair of pressing rollers is arranged in a row, the plurality of rows positioned in different locations on the frame along a moving direction of the moving member,
to press two sides of the folded sheet bundle in the thickness direction with the plurality of pairs of pressing rollers wherein the interval between each pair of pressing rollers is regulated to be different from the interval of the other pairs of pressing rollers in the plurality of pairs of pressing rollers, wherein the interval between each pair of pressing rollers is regulated based on the position of each pair of pressing rollers on the frame, such that a first pair of the plurality of pairs of pressing rollers has an interval larger than a second pair of the plurality of pairs of pressing rollers,

and
to move in the moving direction along the fold of the folded sheet bundle so that each pair of the plurality of pairs of pressing rollers presses the fold of the folded sheet bundle formed by the folding roller and simultaneously forms another fold on the folded sheet bundle.

9. The sheet processing device according to claim 8 , wherein
the plurality of pairs of pressing rollers includes a last pair of the plurality of pairs of pressing rollers in a last row, and
the interval of each pair of pressing rollers is regulated so that the interval between the first pair of the plurality of pairs of pressing rollers in a first row, which is on a side of the moving member closest to the fold of the folded sheet bundle, is defined as L 1 , the interval between the second pair of the plurality of pairs of pressing rollers in a second row after the first row is defined as L 2 being narrower than L 1 , and the last pair of the plurality of pairs of pressing rollers in the last row pressure contacts each other.

10. The sheet processing device according to claim 8 , wherein an elastic member is provided between each pair of pressing rollers and the frame to urge the respective each pair of pressing rollers toward the folded sheet bundle, and by a regulating member maintaining the interval between each pair of pressing rollers, each pair of pressing rollers presses the folded sheet bundle at different positions.

11. The sheet processing device according to claim 10 , wherein the regulating member is a supporting groove provided at the frame supporting a shaft of each pair of pressing rollers.

12. A sheet processing device that presses a folded sheet bundle, comprising:
a plurality of pairs of pressing rollers, each pair of pressing rollers having a first roller facing a second roller with an interval therebetween for sandwiching a fold of the folded sheet bundle and pressing the folded sheet bundle in a thickness direction of the folded sheet bundle, and
a plurality of moving members, wherein ea

Assignees

• Fukasawa Takeshi
• Osada Hisashi
• Takei Akira
• Canon Finetech Nisca Inc

Inventors

• Fukasawa Takeshi
• Osada Hisashi
• Takei Akira

Classifications

• B65H2301/51232

  for flattening · CPC title

• B65H45/18 Primary

  Oscillating or reciprocating blade folders (carried on rotary members B65H45/16) · CPC title

• B65H2801/27

  Devices located downstream of office-type machines · CPC title

• B65H2701/1829

  Bound, bundled or stapled stacks or packages · CPC title

• B65H2701/13212

  Fold, spine portion of folded article · CPC title