Browse Prior Art Database

Fire Control Via Ping-Pong Fire Tiers

IP.com Disclosure Number: IPCOM000047810D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Bolcavage, RD: AUTHOR [+2]

Abstract

Multi-level fire tier signals are provided to allow hammer on-time to exceed fire tier time. Printer hammer fire architecture is based on the number of subscans which, in turn, is a function of hammer and type spacing. Hammer setting is done via a latch 10 which sets given the proper decode of the hammer address and the fire tier time. The latch 10 is reset after the fire tier time concludes. Fire tier time is a function of subscan time plus added time dependent on forms thickness. A unique group of hammers is optioned every subscan, and if one hammer is set during subscan-1, another or more hammers in the same group can be optioned the next subscan-1 time and every subscan-1 time thereafter until printing is completed. For high belt speed, the latch-set time can exceed the scan time. As seen in Fig.

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Fire Control Via Ping-Pong Fire Tiers

Multi-level fire tier signals are provided to allow hammer on-time to exceed fire tier time. Printer hammer fire architecture is based on the number of subscans which, in turn, is a function of hammer and type spacing. Hammer setting is done via a latch 10 which sets given the proper decode of the hammer address and the fire tier time. The latch 10 is reset after the fire tier time concludes.

Fire tier time is a function of subscan time plus added time dependent on forms thickness. A unique group of hammers is optioned every subscan, and if one hammer is set during subscan-1, another or more hammers in the same group can be optioned the next subscan-1 time and every subscan-1 time thereafter until printing is completed.

For high belt speed, the latch-set time can exceed the scan time.

As seen in Fig. 1, a dual set of fire tier signals are gated into each latch. The control logic 11, senses whether latch 10 is "ON" or "OFF". If "ON", control logic 11 blocks the alternate fire tier signal. If "OFF", it allows the fire tier to enable the latch if the decode is present. Fig. 1 shows the timing for a five-subscan system.

Fig. 2 shows the timing of subscan-1 and subscan-2 for two groups of fire tiers whereby the logic of Fig. 3 can be set with either group during option time. If latch 10 were set, control logic 11 would prevent the next fire tier from being gated to reset. For example, assume hammers 1, 6, 11, 16, etc., were option...