Patent ID: 9701140
Date: 2017-07-11
CPC Classifications: B41J

Claim:
1. A method of calculating line feed error on a printer comprising the steps of: a) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; b) feeding a label near the first and second sensors on the holder assembly; c) sensing a position of a first edge of the label, L1A, by the first sensor as the label moves near the first sensor; d) sensing a second position of the first edge of the label, L1B, by the second sensor as the label moves near the second sensor; e) calculating the distance, L1AB, between the first position and the second position; f) calculating the line feed error over the fixed distance, L, by taking the difference (L−L1AB); and g) calculating the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and a burn line of the printer.