Automatic paper alignment mechanism
AssigneeHewlett-Packard Company
InventorMartin K. Mason
Life of this patent
Estimating the term…
Abstract
A paper alignment mechanism for a recorder in which the paper is moved by one or both rollers at the outer edges of the paper along the X axis in accordance with one variable and a stylus is moved across the paper along the Y axis in accordance with another variable, the alignment being achieved by determining the distance between two points on a line parallel to the Y axis and an orientation line on the paper, applying a pivot near one edge of the paper and a force near the other edge, the force being in such direction as to rotate the paper to an aligned position and the relative positions between the pivot and the point of application of the force being such that the paper between them is in tension.
Claims8
Recording apparatus comprising
- a platen,
- a plate mounted so as to be closely spaced above said platen,
- means for detecting a change in the optical characteristics along a plurality of paths perpendicular to and above said platen at a plurality of inspection points,
- first means for selectively applying force at a point on a first side of said platen in either direction along a line in the X direction to a sheet of material when present on said platen, and
- means for selectively inserting a localized obstruction through the space defined between said platen and said plate at a point that is off the line along which the force is applied.
Dependencies are inferred from the claim text.