US 8,899,579 B2Granted

Sheet processing apparatus and image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorYohei Gamo

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Abstract

A sheet processing apparatus and an image forming apparatus move, when stacking a sheet on a stacking tray, a supporting tray disposed to freely appear above the stacking tray to a first position in which the supporting tray projects above the stacking tray and supports the sheet stacked on an intermediate stacking tray. When these apparatuses discharge a processed sheet bundle, these apparatuses move the supporting tray from the first position to a second position in which the supporting tray supports an edge of the discharged sheet in an upstream side in a discharging direction, and guides the moving sheet bundle to a stacking wall. Further, these apparatuses move the supporting tray from the second position to a third position at predetermined timing, so that the supporting tray stops supporting the sheet bundle and stacks the sheet bundle on the sheet bundle previously stacked on the stacking tray.

Claims13

Dependent claims

A sheet processing apparatus comprising:

a sheet processing portion configured to process a sheet bundle;
a sheet stacking portion configured to stack thereon the sheet bundle discharged from a discharge port after being processed on the sheet processing portion;
a regulating portion disposed below the discharge port and configured to regulate a position of an upstream edge, in a discharging direction of the sheet bundle discharged to the sheet stacking portion;
a sheet supporting portion configured to support the sheet bundle;
a moving portion configured to move the sheet supporting portion to a first position where the sheet supporting portion projects above the sheet stacking portion to support an upstream edge portion of the sheet bundle discharged from the discharge port, a second position where the sheet supporting portion releases supporting the upstream edge portion of the sheet bundle to stack the discharged sheet bundle on a sheet bundle previously stacked on the sheet stacking portion, and a stacking position where the sheet supporting portion supports a sheet bundle being processed by the sheet processing portion, the stacking position being above the first position;
and
a control portion configured to control the moving portion so that, after a sheet bundle is processed by the sheet processing portion, the sheet supporting portion is moved from the stacking position to the first position to support the upstream edge portion of the sheet bundle discharged from the discharge port, and sheet supporting portion is moved from the first position to the second position while the upstream edge portion of the sheet bundle is on the sheet supporting portion so as to pull the upstream edge of the sheet bundle to contact with the regulating portion.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/558,241Filed 25 Jul 2012
Priority: JP 2011-16758629 Jul 2011
Published: US 2013/0026702 A131 Jan 2013
Granted: 2 Dec 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B65H 31/34
Pile receivers: apparatus for squaring-up piled articles
B65H 31/10
The articles being piled one above another: and applied at the top of the pile
G03G 15/6552
Apparatus which relate to the handling of copy material: means for discharging uncollated sheet copy material, e.g. discharging rollers, exit trays
B65H 2301/4213
Forming a pile: of a limited number of articles, e.g. buffering, forming bundles