Sheet post-processing apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuri Urano
Life of this patent
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Abstract
The present invention provides a sheet post-processing apparatus for performing squaring processing of a spine in a well-looking manner without leaving “wrinkles” on back portion of booklet and an image forming apparatus including such a sheet post-processing apparatus. It is a characteristic feature thereof that when squaring of the spine by reciprocating the pressing unit along the spine of the booklet by the moving unit is performed, the distance from the spine of the booklet prior to squaring by the pressing unit to the pressing position is changed by the changing portion such that the distance of a backward movement of reciprocating the pressing unit becomes larger than the distance of a forward movement.
Claims14
A sheet post-processing apparatus comprising:
- a holding unit that holds a booklet containing folded sheets;
- a pressing unit having a pressing surface that presses a spine of the booklet held by the holding unit in a pressing direction perpendicular to a thickness direction of the booklet to deform the spine into a square shape;
- a moving unit that moves the pressing unit forward and backward along the spine while the pressing surface of the pressing unit is pressing the spine;
- and
- a changing portion that changes a pressing position of the pressing surface at which the pressing surface presses the spine in the pressing direction,
- wherein the changing portion changes the pressing position so that, when squaring of the spine is performed while the pressing unit reciprocates along the spine of the booklet by the moving unit, a distance in the pressing direction between a top of the spine prior to pressing by the pressing surface and the pressing position is changed such that the distance during a backward movement of reciprocating the pressing unit becomes larger than the distance during a forward movement.
An image forming apparatus comprising:
- an image forming portion which forms an image on a sheet;
- and
- a sheet post-processing apparatus which processes the sheet with the image being formed,
- wherein the sheet post-processing apparatus includes:
- a holding unit that holds a booklet containing folded sheets;
- a pressing unit having a pressing surface that presses a spine of the booklet held by the holding unit in a pressing direction perpendicular to a thickness direction of the booklet to deform the spine into a square shape;
- a moving unit that moves the pressing unit forward and backward along the spine while the pressing surface of the pressing unit is pressing the spine;
- and
- a changing portion that changes a pressing position of the pressing surface at which the pressing surface presses the spine in the pressing direction,
- wherein the changing portion changes the pressing position so that, when squaring of the spine is performed while the pressing unit reciprocates along the spine of the booklet by the moving unit, a distance in the pressing direction between a top of the spine prior to pressing by the pressing surface and the pressing position is changed such that the distance during a backward movement of reciprocating the pressing unit becomes larger than the distance during a forward movement.
Dependencies are inferred from the claim text.