| 摘要 |
1469587 Printers INTERNATIONAL BUSINESS MACHINES CORP 23 May 1975 [28 June 1974] 22875/75 Heading G4H A printer includes an array of type characters arranged in a plurality of groups presented successively in front of a print position, and means whereby, when successive print positions require use of the last group followed by the first group, printing and movement of the array along the print line are inhibited for at least one passage of a group past the print position to allow hammer recovery. As disclosed, there are two groups, one for lower case and numerals, the other for upper case and special characters, and as long as successive characters to be printed are in the same group, hammer recovery occurs during presentation of the other group, the two groups being respective halves of a multi-fingertype rotating print wheel, one character being printed per revolution, in the absence of inhibition. The wheel is driven along the print line by selective engagement with a constantlyrotating lead screw. Provision is also made for small lateral movements of the hammer.
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