Browse Prior Art Database

Print Hammer Flight Time Compensation

IP.com Disclosure Number: IPCOM000052326D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Dayger, DA: AUTHOR

Abstract

Flight-time compensation is done by using hammer addresses as a source of timing information. Specifically, the firing times of selected hammers in a chain, train or belt printer are delayed to compensate for hammer flight and type motion based on the address information.

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Print Hammer Flight Time Compensation

Flight-time compensation is done by using hammer addresses as a source of timing information. Specifically, the firing times of selected hammers in a chain, train or belt printer are delayed to compensate for hammer flight and type motion based on the address information.

In chain printers or the like, the hammer option cycle time roughly corresponds to a fixed distance of type carrier travel. Specifically, the five microsecond hammer option cycle time used on an IBM 1403 1100 lpm printer corresponds to .001" of travel of the carrier. For each printer, the sequence of hammer addresses seen by the hammer driver circuits for the individual hammers is fixed. Therefore, in a given printer, for each hammer address another hammer address can be selected which will represent a type displacement, e.g., in units of .001". The hammer is selected using its actual address in the normal manner. The actual firing is delayed until another preselected hammer address occurs. The position of the printed character on the paper will have been displaced from its nominal position by an amount equal to the distance traveled in an option cycle time multiplied by the number of hammer option times occurring between normal hammer fire selection option time and actual hammer fire.

Referring to the fiqure, delay address register 10 stores the delay address for a specific print hammer. The delay address for the specific hammer is received and loaded into...