公开(公告)号：DE69318643D1

公开(公告)日：1998-06-25

申请号：DE69318643

申请日：1993-08-09

Applicant: XEROX CORP

Inventor： MARTIN MICHAEL J ,  MOORE STEVEN R ,  SOKAC RUSSELL J ,  LAFFEY KATHLEEN ,  SIEGEL ROBERT P ,  GARAVUSO GERALD M ,  DURFEY LLOYD W

IPC: B65H43/00 ,  B65H7/02 ,  G03G15/00

Abstract: A sheet path velocity profile signature analysis apparatus which utilizes output from various idler rolls (82) throughout the machine paper path to detect abnormalities. The idler rolls (82) are in frictional contact with device rolls (84) defining therewith a nip through which individual sheets pass. The idler rolls (82) are coupled to an encoder (86) for generating a signal as a function of the rotational speed of the idler rolls (82). The constantly monitored and instantaneous velocity readings are compared with a base line velocity signature established at the factory. If the constantly monitored velocity profile is not within the pre-established operating parameters as set at the factory, automatic machine adjustment procedures are initiated and/or automatic service alerts are issued. The ability to constantly monitor the velocity profile throughout the machine enables preventative maintenance to occur and worn drive rolls, idler rolls and other transport devices can be replaced before catastrophic failure.

公开(公告)号：DE3275992D1

公开(公告)日：1987-05-14

申请号：DE3275992

申请日：1982-11-25

Applicant: XEROX CORP

Inventor： HOLMES MAURICE F ,  GARAVUSO GERALD M

IPC: B65H3/08 ,  B65H3/12 ,  B65H3/40 ,  B65H3/48 ,  B65H3/54

Abstract: A sheet feeding apparatus with a sheet support tray (10), a rear vacuum plenum chamber (19) adapted to acquire the rear portion of a sheet, a front vacuum plenum chamber (18) positioned over the front of the sheet and adapted to acquire the front portion of a sheet, sheet transport means (27) associated with the front vacuum plenum to transport a sheet acquired in a forward direction and an air knife (28) positioned at the rear of the stack of sheets to inject air between the trailing edge of the top sheet in a stack and the remainder of the stack. In a specific embodiment the trail edge of a sheet in a stack is separated by the air knife, acquired by the rear vacuum plenum (19) then acquired by the front vacuum plenum (18) and transported in a forward direction. As the trailing edge clears the rear vacuum, the rear vacuum which together with the air knife is continuously activated, acquires the next sheet in the stack. In this way the speed of the sheet feeder can be very high since sheets are separated and acquired by the feeder simultaneously with transporting them off the stack. Preferably the apparatus includes preacquisition fluffer jets to initially loosen the top few sheets in the stack, and the air knife (28) includes lateral converging air streams to facilitate separation of the topmost sheet in the stack.

公开(公告)号：CA1197873A

公开(公告)日：1985-12-10

申请号：CA413939

申请日：1982-10-21

Applicant: XEROX CORP

Inventor： GARAVUSO GERALD M

IPC: B65H3/12 ,  B65H3/48 ,  G03B27/62 ,  B65H3/14

Abstract: Apparatus for feeding sheets from a stack of sheets on sheet stack supporting tray which includes means to feed a sheet from a stack and an air injection means disposed adjacent the front of the tray to inject air between the sheet to be separated and the remainder of the stack, the air injection means injecting a planar stream of air which has portions at its ends which converge toward the center of the planar air stream thereby providing both convergence in the planar air stream and expansion in a direction perpendicular to that of the air stream resulting in improved sheet separation. In a preferred embodiment the air injection means includes an array of nozzles, the end nozzles of which are inclined toward the center of the air stream so that the air will converge over the center of the sheet stacking tray. The array of nozzles is directed at an angle down to a stack of sheets in a sheet stacking tray which has a bottom sheet feeder associated with it.