Sheet processing apparatus and image forming system

Patent metadata

Field	Value
Publication number	US-11294318-B2
Application number	US-202017133871-A
Country	US
Kind code	B2
Filing date	Dec 24, 2020
Priority date	Dec 26, 2019
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A sheet processing apparatus performs folding processing so that one end of a sheet exists inside the folded sheet. The sheet processing apparatus includes a transport path to guide a transported sheet, a rotating body pair capable of transporting the sheet in a first direction to perform folding processing, and in a second direction for switching back the sheet subjected to the folding processing, a folding blade that pushes the sheet to a nip portion of the rotating body pair, a press member that presses the sheet folded by the rotating body pair in the second direction, and a shift section that shifts the press member for pressing the sheet. In switching back the sheet, a control section controls transport of the sheet so that the one end of the sheet is halted within a region between the press member and a guide face of the transport path.

First claim

The invention claimed is:

1. A sheet processing apparatus for performing folding processing in a plurality of portions of a sheet and performing the folding processing so that one end of the sheet exists inside the sheet folded, comprising:
a transport path including a guide face to guide a sheet transported in a predetermined transport direction;
a rotating body pair adapted to be able to transport the sheet in a first direction for nipping the sheet transported to the transport path by a nip portion to rotate, and thereby drawing the sheet to perform folding processing, and in a second direction for performing switchback on the sheet subjected to the folding processing in a direction opposite to the direction for drawing;
a folding blade adapted to push the sheet transported to the transport path to the nip portion of the rotating body pair;
a press member adapted to press the sheet, which is subjected to the folding processing by the rotating body pair and is transported in the second direction, to one direction side that is one of the transport direction and a direction opposite to the transport direction;
a shift section adapted to shift the press member in a direction for pressing the sheet; and
a control section adapted to control the rotating body pair and the shift section,
wherein in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the rotating body pair and the shift section so that the one end of the sheet subjected to the folding processing by the rotating body pair is pressed by the press member, within a region between a shift locus of the press member and the guide face of the transport path.

2. A sheet processing apparatus for performing folding processing in a plurality of portions of a sheet and performing the folding processing so that one end of the sheet exists inside the sheet folded, comprising:
a transport path including a guide face to guide a sheet transported in a predetermined transport direction;
a transport section adapted to be able to transport the sheet in a first direction for drawing the sheet transported to the transport path, and in a second direction for performing switchback on the drawn sheet in a direction opposite to the direction for drawing;
a rotating body pair adapted to nip the sheet transported to the transport path by a nip portion to rotate, and thereby perform folding processing on the sheet, each including a first circumferential surface with a radius from a rotating shaft of the rotating body to a rotating body circumferential surface, and a second circumferential surface with a radius from the rotating shaft smaller than the radius of the first circumferential surface;
a folding blade adapted to push the sheet transported to the transport path to the nip portion of the rotating body pair;
a press member adapted to press the sheet, which is subjected to the folding processing by the rotating body pair and is transported in the second direction, to one direction side that is one of the transport direction and a direction opposite to the transport direction;
a shift section adapted to shift the press member in a direction for pressing the sheet; and
a control section adapted to control the transport section and the shift section,
wherein in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the transport section and the shift section so that the one end of the sheet subjected to the folding processing by the rotating body pair is pressed by the press member, within a region between a shift locus of the press member and the guide face of the transport path.

3. The sheet processing apparatus according to claim 1 , wherein the press member is provided rotatably around a rotation support as a center, and
in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the rotating body pair and the shift section so that the one end of the sheet is pressed by the press member, within the region between a rotation locus of the press member and the guide face of the transport path.

4. The sheet processing apparatus according to claim 2 , wherein the press member is provided rotatably around a rotation support as a center, and
in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the transport section and the shift section so that the one end of the sheet is pressed by the press member, within the region between a rotation locus of the press member and the guide face of the transport path.

5. The sheet processing apparatus according to claim 3 , wherein in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the rotating body pair to halt the one end of the sheet subjected to the folding processing by the rotating body pair, within the region between the rotation locus of the press member and the guide face of the transport path, and controls the shift section to rotate the press member.

6. The sheet processing apparatus according to claim 4 , wherein in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the transport section to halt the one end of the sheet subjected to the folding processing by the rotating body pair, within the region between the rotation locus of the press member and the guide face of the transport path, and controls the shift section to rotate the press member.

7. The sheet processing apparatus according to claim 3 , wherein the press member is able to shift to a first guide position for guiding the sheet along the guide face of the transport path, in receiving the sheet in the transport path, and to a second guide position for guiding the sheet, in transporting the sheet subjected to the folding processing by the rotating body pair to the one direction side, and
the control section controls the shift section so as to rotate the press member from the second guide position to the first guide position at a velocity faster than in a shift from the first guide position to the second guide position.

8. A sheet processing apparatus for performing folding processing in a plurality of portions of a sheet and performing the folding processing so that one end of the sheet exists inside the sheet folded, comprising:
a transport path including a guide face to guide a sheet transported in a predetermined transport direction;
a rotating body pair adapted to be able to transport the sheet in a first direction for nipping the sheet transported to the transport path by a nip portion to rotate, and thereby drawing the sheet to perform folding processing, and in a second direction for performing switchback on the sheet subjected to the folding processing in a direction opposite to the direction for drawing;
a folding blade adapted to push the sheet transported to the transport path to the nip portion of the rotating body pair;
a direction change member adapted to change a direction of the sheet, which is subjected to the folding processing by the rotating body pair and is transported in the second direction, to one direction side that is one of the transport direction and a direction opposite to the transport direction;
a shift section adapted to shift the direction change member; and
a control section adapted to control the rotating body pair and the shift section,
wherein in performing the switchback on the sheet subjected to the folding processing by the rotating body pair, the control section controls the rotating body pair and t

Assignees

• Katayama Takuya
• Komiyama Daiki
• Canon Finetech Nisca Inc

Inventors

• Katayama Takuya
• Komiyama Daiki

Classifications

• B65H2701/18292

  Stapled sets of sheets · CPC title

• B65H45/18

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

• G03G15/6582 Primary

  Special processing for irreversibly adding or changing the sheet copy material characteristics or its appearance, e.g. stamping, annotation printing, punching · CPC title

• B65H37/06

  for folding · CPC title

• B65H2404/693

  Retractable guiding means, i.e. between guiding and non guiding position · CPC title