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Hammer Check Circuit

IP.com Disclosure Number: IPCOM000093789D
Original Publication Date: 1966-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Barcomb, JG: AUTHOR [+2]

Abstract

Hammer checking in a printer is accomplished. This is effected by addressing a latch 10 and driver 12 for each print position on a compare through its And 14. The driver output negative going pulse is sampled on the next cycle through And 16 with the next higher address. And's 16 for all print positions are Or'ed in Or 18. The output of Or 18 is sampled at time 4 directly in And 20 and inverted by inverter 22 in And 24 with the on and off outputs of a common trigger 25. The latter stores each compare. Trigger 25 set by a compare and reset at time 1 to indicate at the output of Or 26 whether a hammer failed to fire on a compare or whether one did fire without a compare, respectively. Typical timing curves are shown below the circuit.

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Hammer Check Circuit

Hammer checking in a printer is accomplished. This is effected by addressing a latch 10 and driver 12 for each print position on a compare through its And 14. The driver output negative going pulse is sampled on the next cycle through And 16 with the next higher address. And's 16 for all print positions are Or'ed in Or 18.

The output of Or 18 is sampled at time 4 directly in And 20 and inverted by inverter 22 in And 24 with the on and off outputs of a common trigger 25. The latter stores each compare. Trigger 25 set by a compare and reset at time 1 to indicate at the output of Or 26 whether a hammer failed to fire on a compare or whether one did fire without a compare, respectively. Typical timing curves are shown below the circuit.

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