Browse Prior Art Database

Print Hammer Check System

IP.com Disclosure Number: IPCOM000096701D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Schaaf, FW: AUTHOR [+2]

Abstract

This permits higher speed operation of a chain printer having checking circuitry generally of the type disclosed in Patent No. 3,066,601. Such is realized by checking cores in hammer fire check plane 64 one print cycle later so as to permit the hammer fire current to decay sufficiently for the core to be read out.

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Print Hammer Check System

This permits higher speed operation of a chain printer having checking circuitry generally of the type disclosed in Patent No. 3,066,601. Such is realized by checking cores in hammer fire check plane 64 one print cycle later so as to permit the hammer fire current to decay sufficiently for the core to be read out.

This is effected by addition of equal check delay core plane 61. Here, the core for a particular print position is set over line 63 on the print cycle following that in which the corresponding core in the equal check plane 60 is set.

When an equal compare occurs between a character on the chain in a particular print position and the character in storage 20 for that position, the corresponding core in plane 60 is reset by a signal from print compare 48 over line 58. A signal is provided to fire the corresponding print hammer over line 55. Firing of the print hammer sets the core in plane 64 for the particular position over line 62. Since the comparison is now made between a core in plane 64 and a core in plane 61, the compare with the core in the plane 64 is delayed a cycle to permit the hammer fire current to decay and permit reading the core condition.

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