Patent ID: 11891262
Assignee: CANON PRODUCTION PRINTING HOLDING B.V.
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 14:
15. A sheet stacker comprising:
a flipper for flipping a sheet with respect to an orientation of the sheet before being received by the flipper onto a stack support or a stack of sheets on said stack support;
sensors arranged for detecting an out-of-plane deformation of a top sheet with respect to the stack support or the stack of sheets on said stack support at least for each sheet added to the stack; and
a controller configured to determine from data from the sensors whether the top sheet was successfully flipped and stacked,
wherein the controller is configured to derive at least flipping fault parameter from data from a detector of the sensors and to transmit information for the at least flipping fault parameter to a database with a look-up table for determining a root cause of a flipping fault.