Sheet-material associating – Associating and folding – Sheet associating
Patent
1989-02-28
1991-09-03
Look, Edward K.
Sheet-material associating
Associating and folding
Sheet associating
493420, B42C 100
Patent
active
050446177
ABSTRACT:
A sheet folding apparatus having a feed roller device for grasping and propelling a sheet forward, a first gate for receiving a leading portion of the propelled sheet and stopping the same at a predetermined distance therein to cause a first buckle in the trailing portion of the sheet, a first fold roller device for grasping the sheet at the first buckle and propelling the sheet with the first buckle leading into a second gate and stopping the same at a predetermined distance therein to cause a second buckle in the trailing portion of the sheet, the first and second buckles forming opposed overleaves having their inner edges in juxtaposition, a second fold roller device for grasping the sheet at the second buckle and propelling the sheet with the second buckle leading into a third gate and stopping the same at a predetermined distance therein to cause a third buckle in the trailing portion of the sheet, a third fold roller device for grasping the sheet at the third buckle and propelling the sheet with the third buckle leading through the exit of the folding operation, an air jet device disposed in close proximity to the inner edges and adjacent to the entry of the third fold roller device and adapted to apply air pressure to the inner edges in a direction tending to force them flat against the underlying sheet portion as the third buckle is being formed and is being engaged by the third fold roller device.
REFERENCES:
patent: 2699331 (1955-01-01), McGarvey
patent: 3773315 (1973-11-01), Tsien
patent: 3901501 (1975-08-01), Kistner
patent: 4601695 (1986-07-01), Pazzi
patent: 4850945 (1989-07-01), Whittenberger
Look Edward K.
M.B.O. Binder and Company of America
Newholm Therese M.
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