Browse Prior Art Database

Line or Columnar Printer

IP.com Disclosure Number: IPCOM000094095D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Demer, FM: AUTHOR

Abstract

The line or columnar printer has a character bearing print drum D. This is removable from a cantilever shaft S. The latter is driven by motor M. By removal of bolt B the drum is easily changed from either one style of type to another or from a line to one of a columnar configuration.

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Line or Columnar Printer

The line or columnar printer has a character bearing print drum D. This is removable from a cantilever shaft S. The latter is driven by motor M. By removal of bolt B the drum is easily changed from either one style of type to another or from a line to one of a columnar configuration.

Print hammers H are selectively activated from a 2-D memory.

This has one core per character per print position. Readout of the 2-D memory is effected by a commutator and segment arrangement CR-CS. The latter is operated in synchronism with drum D to read out each row of character cores in the 2-D memory as drum D presents such row at the print position, to activate hammers H in response to the cores selected.

The 2-D memory is loaded by either selecting or setting a particular character core in accordance with the character required for each print position. Data from processor P is passed through switch contacts SW1B and SW2B to the 2-D memory through decode circuits DC under the control of register R, when line printing, to select the 2-D cores.

When columnar printing is to be performed, drum D is changed. A page of data is written into the 1 channel of storage drum SD. Such writing is through switch contact SW1A and read out a column at a time through SW2A, and from register R and decode DC into the 2-D memory to operate selected hammers H in conjunction with CR-CS. While channel 1 is read out, channel 2 can be loaded from processor P to be ready for the n...