Knockdown for compiling recording media in finisher

A finisher, comprising:

• a main body having an input port to receive a recording medium and an output port to output the recording medium after a finishing operation is performed on the recording medium;
• and
• a compiler section to receive the recording medium transported from the input port along a path within the finisher and to output the recording medium to the output port, the compiler section including:
• a register tray to accommodate the recording medium for compiling,
• an upper paper guide provided above the register tray;
• a rotatable shaft coupled to the upper paper guide;
• a paddle coupled to the rotatable shaft to compile the recording medium toward an end of the register tray, and
• a knockdown device rotatably coupled to the upper paper guide to:
• be provided above the register tray, and to rotate so that a rotation axis of the knockdown device is eccentric to a rotation axis of the rotatable shaft;
• and
• apply a downward force to a first edge of the recording medium, the first edge being an edge of the recording medium nearest to the output port while the recording medium is in the register tray, the output port being opposite to the end of the register tray, to decrease a curl in the recording medium at the first edge of the recording medium,
• wherein the knockdown device includes a tapered outer side to allow a tamper to contact and slide under the knockdown device as the tamper moves in an inward direction toward opposite sides of the recording medium to align the recording medium.

A non-transitory machine readable storage comprising instructions that when executed cause at least one processor of a finisher to:

• control a driving source of the finisher to rotate a first rotatable shaft in a compiling section of the finisher in a forward direction such that a paddle coupled to the first rotatable shaft rotates in the forward direction to compile a recording medium in a register tray of the finisher;
• and
• control the driving source to rotate the first rotatable shaft in one of the forward direction or a reverse direction to cause a knockdown device coupled to a second rotatable shaft and provided above the register tray to rotate to apply a downward force to a first edge of the recording medium while the recording medium is in the register tray, the first edge being an edge of the recording medium nearest to an output of the finisher, the output being opposite to an end of the register tray in which the recording medium is compiled, to decrease a curl in the recording medium at the first edge of the recording medium,
• wherein the knockdown device includes a tapered outer side to allow a tamper to contact and slide under the knockdown device as the tamper moves in an inward direction toward opposite sides of the recording medium to align the recording medium.