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Print Hammer Firing Technique Disclosure Number: IPCOM000061724D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

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Carrington, JE Hryck, MD Skinner, DW Westcott, GR [+details]


Hammer energization in a printer having a band of characters of constant pitch can be adapted for subscan operation with a plurality of optional hammers by incorporating individual hammer firing pulse delays to compensate for the serial comparing sequence necessary between a band image buffer and print line buffer. Referring to the figure, in a printer having a moving print band 1 with embossed characters 2 at constant pitch, a plurality of hammers 3 are optioned or concurrently aligned with respective characters for printing. Because the band 1 is constantly moving and the hammers 3 require flight time to reach the band, the hammers must be selected and energized with respect to a timing mark 4 a predetermined time before the desired character 2 arrives at the point of impact.