Apparatus and method for sheet registration using a single sensor
AssigneeXerox Corporation
InventorsVittorio R. Castelli, Osman T. Polatkan
Life of this patent
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Abstract
A deskewing and registering device for an electrophotographic printing machine. A single sensor determines the position and skew of a sheet in a paper path and generate signals indicative thereof. A pair of independently driven nips forward the sheet to a registration position in skew and at the proper time based on signals from a controller which interprets the position signals and generates the motor control signals. An additional single sensor can be used at the registration position to provide feedback for updating the control signals as rolls wear or different substrates having different coefficients of friction are used.
Claims10
An apparatus for registering and deskewing a sheet along a paper path, comprising:
- a single sensor only located along the paper path, to sense a position of a sheet in the paper path and to generate a signal indicative thereof;
- a pair of independently driven drive nips located in the paper path for forwarding a sheet therealong;
- a controller, to receive signals from said single sensor and to generate motor control drive signals for said pair of independently driven drive nips as a function of said signals so as to deskew and register a sheet at a registration position in the paper path downstream in the path from said single sensor.
An electrophotographic printing machine having a device for registering and deskewing a sheet along a paper path comprising:
- a single sensor only located along the paper path, to sense a position of a sheet in the paper path and to generate a signal indicative thereof;
- a pair of independently driven drive nips located in the paper path for forwarding a sheet therealong;
- a controller, to receive signals from said single sensor and to generate motor control drive signals for said pair of independently driven drive nips as a function of said signals so as to deskew and register a sheet at a registration position in the paper path.
A method for registering and deskewing a sheet along a paper path, comprising:
- sensing the lead edge position and edge position of a sheet with a single sensor only to sense a position of a sheet in the paper path and to generate a signal indicative thereof;
- determining a skew angle error and a registration position error of the sheet and generating a set of signals indicative thereof;
- driving a pair of drive nips independently pursuant to said set of signals as a function of the skew angle error and registration position error so that the sheet arrives at a registration position downstream in the paper path from the single sensor at a proper time and in proper alignment position.
Dependencies are inferred from the claim text.