Differential drive for sheet registration drive rolls with skew detection
AssigneeXerox Corporation
InventorsDavid R. Kamprath, Martin E. Hoover
Life of this patent
Estimating the term…
Abstract
A registration system for copy sheets uses a pair of drive rolls and a drive system for commonly driving both drive rolls. A differential drive mechanism is provided for changing the relative angular position of one of the rolls with respect to the other roll to deskew the copy sheet. A control system is supplied with inputs representative of the skew of the copy sheet and controls the differential drive mechanism to deskew the copy sheet. The system offers enhanced performance and reduced cost.
Claims38
A sheet registration comprising:
- a first rotatable roll for driving a sheet;
- a second rotatable roll, spaced laterally from first roll, for driving a sheet;
- a single drive motor for commonly driving the first and second rolls;
- a differential drive means for changing the angular rotational position of one of the rolls differentially with respect to the angular rotational position of the other roll;
- and
- control means for sensing skew in a sheet and controlling the differential drive means in relation to the amount of skew sensed.
A copy sheet registration apparatus comprising:
- means defining a copy sheet path;
- determining means for determining the amount of skew in a copy sheet in said copy sheet path;
- determing means for determining the amount of skew in a copy sheet in said copy sheet path;
- means for moving a copy sheet in the copy sheet path and controlling the skew of the copy sheet comprising:
- a first rotatable roll for driving a sheet;
- a second rotatable roll, spaced laterally from said first roll, for driving a sheet;
- a first drive means for commonly driving the first and second rolls;
- and
- a differential drive means for changing the angular rotational position of one of the first and second rolls differentially with respect to the angular rotational position of the other roll without changing the speed of said first and second rolls;
- and
- means responsive to the determining means for controlling the differential drive means to control the skew of the copy sheet.
A sheet registration apparatus comprising:
- means defining a sheet feed path;
- a first rotatable roll for feeding a sheet;
- a second rotatable roll, spaced laterally from said first roll, for feeding a sheet;
- a drive means for commonly driving the first and second rolls;
- a differential drive means located between said first rotatable roll and said second rotatable roll for changing the angular rotational position of one of the first and second rolls differentially with respect to the angular rotational position of the other roll;
- and
- control means for sensing skew in a sheet being fed in said sheet feed path means and controlling the differential drive means in relation to the amount of skew sensed.
A sheet registration apparatus comprising:
- means defining a sheet feed path;
- a first rotatable roll for feeding a sheet;
- a second rotatable roll, spaced laterally from said first roll, for feeding a sheet;
- a drive motor for commonly driving the first and second rolls, said drive motor being connected to said first roll;
- a differential drive means for changing the angular rotational position of one of the first and second rolls differentially with respect to the angular rotational position of the other roll;
- and
- control means for sensing skew in a sheet being fed in said sheet feed path means and controlling the differential drive means in relation to the amount of skew sensed;
- wherein said differential drive means connects said second roll to said motor.
Dependencies are inferred from the claim text.