Method for detecting leading edge of print medium

Details Method for detecting leading edge of print medium Method for detecting leading edge of print medium

1998-07-02

2000-11-07

Lee, Thomas C.

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Digital positioning

358497, H04N 104

Patent

active

061448869

ABSTRACT:
A method for detecting the leading edge of a sheet of print medium by driving a line feed motor at a predetermined speed; scanning and storing a data block of the sheet by slices; determining the leading edge of the sheet, based on the scanned and stored data; calculating sheet position according to the edge determination, and calculating a drive value of the line feed motor according to the sheet position; and second driving the line feed motor according to the calculated drive value. The data of the scanned data block is stored such that a scanning level of pixel data for a given horizontal line is regularly stored in an address memory, and the determining step searches for a boundary on which both near-absolute black and near-absolute white pixel data values are indicated in the scanning and storing step.

REFERENCES:
patent: 5402252 (1995-03-01), Kojima
patent: 5479586 (1995-12-01), Gallagher et al.
patent: 5614982 (1997-03-01), Yasukawa
patent: 5825512 (1998-10-01), Okita
patent: 6002495 (1999-12-01), Rombult et al.

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