Method and system to calculate line feed error in labels on a printer

A system to calculate line feed error on a printer, comprising:

• a holder assembly, the holder assembly positioned in the printer before a printer burn line;
• a first sensor and a second sensor disposed on the holder assembly with a fixed distance, L, between the first sensor and the second sensor;
• a processor communicatively linked to the first sensor and the second sensor;
• the first sensor being configured to sense a first position of a first edge of the label, L1A, as the label moves over the first sensor;
• the second sensor being configured to sense a second position of the first edge of the label, L1B, as the label moves over the second sensor;
• the processor being configured to calculate a distance, L1AB, between the first position and the second position;
• and
• the processor being further configured to calculate a line feed error over the fixed distance, L, by taking the difference (L−L1AB).

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 having an optical feature near the first and second sensors on the holder assembly;
• c) sensing a position of the optical feature, L1A, by the first sensor as the label moves near the first sensor;
• d) sensing a second position of the optical feature, L1B, by the second sensor as the label moves near the second sensor;
• e) calculating a distance, L1AB, between the first position and the second position;
• f) calculating a line feed error over the fixed distance, L, by taking the difference (L−L1AB);
• and
• g) calculating a 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 the burn line of the printer.