Browse Prior Art Database

Hammer Flight Time Correction

IP.com Disclosure Number: IPCOM000051134D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Survant, TG: AUTHOR

Abstract

In a software-controlled printer that employs a solenoid as a print hammer mounted on a moving carrier and which is capable of on the fly printing, the "flight time" of the hammer becomes critical. Flight-time may be defined as the time between the current pulse to the hammer and the print petal impact on the platen, as illustrated in Fig. 1. Due to the nature of the hammer, this flight time may vary insignificantly in any single hammer for a given condition, but from one hammer to another the flight time variation may be substantial.

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Hammer Flight Time Correction

In a software-controlled printer that employs a solenoid as a print hammer mounted on a moving carrier and which is capable of on the fly printing, the "flight time" of the hammer becomes critical. Flight-time may be defined as the time between the current pulse to the hammer and the print petal impact on the platen, as illustrated in Fig. 1. Due to the nature of the hammer, this flight time may vary insignificantly in any single hammer for a given condition, but from one hammer to another the flight time variation may be substantial.

If during on-the-fly printing, this flight time is shorter than the design time (that time employed by the software), then the printed character will be to the left of the desired print point on a left to right printed character and to the right on a right to left printed character. Of course the converse is true if the flight time is longer than the design time. In a printer that prints bidirectionally on the fly and bidirectionally incrementally, the problem becomes compounded.

Fig. 2 illustrates the representation of a short flight time in a printer that is capable of printing both bidirectionally and incrementally as well as on the fly. In Fig. 2, print position 10 is the left to right on the fly print position; print position 12 is the left to right incremental print position; print position 11 is the right to left on the fly print position; and print position 13 is the right to left incremental pr...