High speed vertical reciprocating sheet trail edge stacking assistance system
AssigneeXerox Corporation
InventorsDavid Thomas, Kenneth C. Smith, Jeffrey W. Ryan, Christopher Pearce
Life of this patent
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Abstract
A print media sheets trailing edge knockdown stacking assistance system, in a compiler or other stacking system with a substantial sheet gravity drop, activated for each ejected sheet to move substantially linearly and perpendicularly downwardly from above, but adjacent to, the sheet ejection position to engage a sheet end area and rapidly push it down towards the underlying stack of sheets and into engagement with any sheet compiling device, then automatically rapidly reciprocally lifting up out of the way above the sheet ejection position before another sheet is ejected, without any significant pause between its up and down movements.
Claims8
In a sheet stacking system in which non-rigid print media sheets are:
- sequentially ejected from a sheet ejection position to drop onto an underlying stack of other such non-rigid print media sheets to be superposed thereon, there is provided a sheet stacking assistance system comprising:
- a system for providing a signal that the trailing edge of a print media sheet is being ejected from said sheet ejection position,
- a rack and gear driven print media sheet trailing edge knockdown system activated in response to said signal that the trailing edge of a print media sheet is being ejected from said sheet ejection position,
- said print media sheet trail edge knockdown system moving substantially linearly downwardly from above said sheet ejection position and past said sheet ejection position to engage a trailing edge area of said ejected print media sheet to rapidly push said print media sheet rapidly downwardly towards said underlying stack of other such non-rigid print media sheets,
- said print media sheet trail edge knockdown system then automatically rapidly reciprocally lifting up away from said print media sheet to above said sheet ejection position before a subsequent said sequential ejection of a print media sheet from said sheet ejection position.
In a method of sheet stacking in which non-rigid print media sheets are sequentially ejected from a sheet ejection position to drop onto an underlying stack of other such non-rigid print media sheets to be superposed thereon, there is provided sheet stacking assistance method comprising:
- providing a signal that the trailing edge of a print media sheet is being ejected from said sheet ejection position,
- activating an automatic rack and gear driven print media sheet trailing edge area knockdown system in response to said signal that the trailing edge of a print media sheet is being ejected from said sheet ejection position,
- moving said print media sheet trail edge knockdown system substantially linearly downwardly from above said sheet ejection position past said sheet ejection position to engage a trailing edge area of said ejected print media sheet to rapidly push said ejected print media sheet downwardly towards said underlying stack of other such non-rigid print media sheets,
- said print media sheet trail edge knockdown system then automatically rapidly reciprocally lifting up away from said print media sheet to above said sheet ejection position before a subsequent said sequential ejection of a print media sheet from said sheet ejection position.
Dependencies are inferred from the claim text.