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Browse Prior Art Database

Cooperating Print Hammers

IP.com Disclosure Number: IPCOM000081943D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Dowd, AA: AUTHOR

Abstract

In a printer using print hammers to selectively print in either of two adjacent print positions, a hammer width of 0.200 inch is used with each print column occupying 0.100 inch and type characters spaced 0.250 inch between centers on the type belt.

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Cooperating Print Hammers

In a printer using print hammers to selectively print in either of two adjacent print positions, a hammer width of 0.200 inch is used with each print column occupying 0.100 inch and type characters spaced 0.250 inch between centers on the type belt.

Where it is desired to print both 0.100 inch and 0.075 inch wide columns, it is common to use print hammers which are of a common denominator width, namely, 0.300 inch. This means that the type characters must be spaced accordingly, so as not to strike two adjacent characters with one hammer.

It is proposed to avoid unnecessary hammer width with its corresponding type pitch growth and related performance degradation, by using two adjoining print harmers cooperatively for striking a single-type character.

As shown in Fig. 1, by using two print hammers #1 and #2 each 0.190 inch wide and a third print hammer #3 which is 0.210 inch wide, printing on 0.100 inch centers with type characters 5a, 5b, 5c, etc. on 0.250 inch centers may be performed satisfactorily.

When printing on 0.075 inch centers with type characters 6a, 6b, etc. on
0.300 inch centers, as shown in Fig. 2, hammers #1 and #2 cooperate to print in column 3, while hammer #3 must be capable of printing in three different columns, namely columns 6-8. Hammer #1 additionally prints in columns 1 and 2, and hammer #2 in columns 4 and 5.

Print samples which have been run show that the split line in a character printed by two cooperating print...