Media multi-feed rejection process with an encoded counter-rotating roller
AssigneeHewlett-Packard Development Company, L.P.
InventorsGary L. Miller, Ed Tucker, Jon Johnson
Life of this patent
Estimating the term…
Abstract
This invention relates to a media multi-feed rejection apparatus, comprising: a plurality of feed rollers; a feed roller driving means operatively connected to one of the plurality of feed rollers; a clutch means operatively connected to the other of the plurality of feed rollers; and a single channel encoder means operatively connected to the clutch means to measure a rotation of the other of the plurality of feed rollers.
Claims16
A method, comprising:
- rotating a first feed roller in a first rotational direction to cause sheets of media to move towards a printing mechanism;
- rotating a second feed roller in the first rotational direction to cause surfaces of the first feed roller and the second feed roller to rotate in opposite directions in a nip between the first and second feed roller;
- preventing the second feed roller from rotating in a second rotational direction opposite the first rotational direction while sheets of media are being fed into the nip;
- ascertaining rotational velocity of the second feed roller in the first rotational direction;
- and
- determining that a multi-feed separation is being performed in response to a determination that the ascertained rotational velocity of the second feed roller in the first rotational direction exceeds a threshold value.
A non-transitory computer-readable medium tangibly embodying instructions that, when executed by the computer cause the computer to perform a method comprising:
- rotating a first feed roller in a first rotational direction to cause sheets of media to move towards a printing mechanism;
- rotating a second feed roller in the first rotational direction to cause surfaces of the first feed roller and the second feed roller to rotate in opposite directions in a nip between the first and second feed roller;
- preventing the second feed roller from rotating in a second rotational direction opposite the first rotational direction while sheets of media are being fed into the nip;
- ascertaining rotational velocity of the second feed roller in the first rotational direction;
- and
- determining that a multi-feed separation is being performed in response to a determination that the ascertained rotational velocity of the second feed roller in the first rotational direction exceeds a threshold.
Dependencies are inferred from the claim text.