US Patent No. 9,244,419

SHEET COMPRESSION APPARATUS AND IMAGE FORMING APPARATUS


Patent No. 9,244,419
Issue Date January 26, 2016 
Title Sheet Compression Apparatus And Image Forming Apparatus
Inventorship Kazunari Hatazaki, Kashiwa (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,244,419

1. An image forming apparatus comprising:
a sheet feeding unit configured to feed a sheet;
a pair of first nipping members configured to compress the sheet fed by the sheet feeding unit while the sheet is nipped and
configured to be separatable from each other;

a first separation mechanism configured to perform a separation operation of the pair of first nipping members;
a pair of second nipping members configured to compress the sheet nipped by the pair of first nipping members while the sheet
is nipped and configured to be separatable from each other;

a second separation mechanism configured to perform a separation operation of the pair of second nipping members;
an image forming unit configured to form an image on the sheet nipped by the pair of first nipping members and the pair of
second nipping members;

a conveyance switching unit having a reversely-rotatable roller which normally rotates and conveys the sheet compressed by
the pair of first nipping members and then, which reversely rotates and conveys the sheet to switch the sheet conveying direction
of the sheet compressed by the pair of first nipping members; and

a controlling portion controls the first separation mechanism so after a first end of the sheet as a leading edge in a sheet
conveying direction passes between the pair of first nipping members, the first separation mechanism relatively moves the
pair of first nipping members closer to each other to nip the sheet, and then the pair of first nipping members compresses
a second end of the sheet as a trailing edge in the sheet conveying direction, and controls so after the first end of the
sheet leading edge in the sheet conveying direction passes between the pair of second nipping members, the second separation
mechanism relatively moves the second nipping members closer to each other to nip the sheet and the conveyance switching unit
switches sheet conveying direction of the sheet, and then the pair of second nipping members compresses the first end of the
sheet as the trailing edge in the sheet conveying direction.