Punching processing apparatus, sheet post-processing apparatus, and image forming apparatus

A sheet post-processing apparatus capable of performing binding processing on a sheet, the sheet post-processing apparatus including a punching processing apparatus, the punching processing apparatus comprising:

• a punching scrap collection member that is disposed at a position where punching scraps produced after punching a sheet drop;
• a punching scrap housing unit that is disposed in the punching scrap collection member and movable in a horizontal direction;
• a registration detection unit that is movable in a width direction of the sheet for detecting a positional deviation amount of the sheet in the width direction when a position of the sheet in the width direction is adjusted so as to meet a punching position;
• and
• a linking member that has a swing base end supported by a swing supporter provided to an upper portion of a sidewall of the punching scrap collection member facing a sidewall of the punching scrap housing unit, and is swingable,
• wherein:
• moving directions of the punching scrap housing unit and the registration detection unit are set to be identical,
• the linking member is supported in such a manner that the swing base end straddles the swing supporter of the punching scrap collection member, and one swing end of the linking member straddling the swing supporter of the punching scrap collection member is engaged with an engagement portion formed on the sidewall of the punching scrap housing unit and the other swing end of the linking member is provided with a driven cam portion capable of abutting a cam portion provided to the registration detection unit, and
• punching scraps accumulated in the punching scrap housing unit are shaken and flattened out by causing the punching scrap housing unit to move in the horizontal direction in coordination with the movement of the registration detection unit.

An image forming apparatus that forms an image on a sheet, the image forming apparatus including a punching processing apparatus, the punching processing apparatus comprising:

• a punching scrap collection member that is disposed at a position where punching scraps produced after punching a sheet drop;
• a punching scrap housing unit that is disposed in the punching scrap collection member and movable in a horizontal direction;
• a registration detection unit that is movable in a width direction of the sheet for detecting a positional deviation amount of the sheet in the width direction when a position of the sheet in the width direction is adjusted so as to meet a punching position;
• and
• a linking member that has a swing base end supported by a swing supporter provided to an upper portion of a sidewall of the punching scrap collection member facing a sidewall of the punching scrap housing unit, and is swingable,
• wherein:
• moving directions of the punching scrap housing unit and the registration detection unit are set to be identical,
• the linking member is supported in such a manner that the swing base end straddles the swing supporter of the punching scrap collection member, and one swing end of the linking member straddling the swing supporter of the punching scrap collection member is engaged with an engagement portion formed on the sidewall of the punching scrap housing unit and the other swing end of the linking member is provided with a driven cam portion capable of abutting a cam portion provided to the registration detection unit, and
• punching scraps accumulated in the punching scrap housing unit are shaken and flattened out by causing the punching scrap housing unit to move in the horizontal direction in coordination with the movement of the registration detection unit.