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Individual Function Gating for a Plurality of Print Positions

IP.com Disclosure Number: IPCOM000044621D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Carrington, JE: AUTHOR [+2]

Abstract

Individual function gating for a plurality of print positions maintains simultaneous control over all functions that occur at different times for each print position during the process of printing a line on a high speed impact printer. This gating focuses primarily on the functions that occur when the print latch signal is on and is gated with three check bits, referred to as Enable, Fired and Handled. These functions are as follows: 1. Hammer Misfire Checking - verifies that hammer drivers do not turn "on" at the wrong time (Enable and Handled) while printing. 2. Hammer Failure - verifies that the hammer drivers turn "on" at the proper time (Fired) while printing. 3.

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Individual Function Gating for a Plurality of Print Positions

Individual function gating for a plurality of print positions maintains simultaneous control over all functions that occur at different times for each print position during the process of printing a line on a high speed impact printer. This gating focuses primarily on the functions that occur when the print latch signal is on and is gated with three check bits, referred to as Enable, Fired and Handled. These functions are as follows: 1. Hammer Misfire Checking - verifies that hammer drivers do not turn "on" at the wrong time (Enable and Handled) while printing. 2. Hammer Failure - verifies that the hammer drivers turn "on" at the proper time (Fired) while printing. 3. PLB (Print Line Buffer)/BIB (Band Image Buffer) Compare - is an equal compare between print and band data during Enable time if the compare is not inhibited for various error or control reasons. 4. Start Carriage - is a signal generated at the earliest possible instant (all hammers fired) at the end of the print line to start carriage motion. 5. Print line Complete - is an interrupt signal generated at the end of a print line after all hammer drivers have been turned off and checked (all handled bits). 6. Hammer Settling - is an individual print position mechanical settling timeout that occurs after the hammer driver is reset (Handled) to permit maximum printer throughput with the best possible registration. Fig. 1 illustrates the timing...