Importance

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Abstract

A needle end ruby of a needle printing head where the printing needle writing ends are arranged along one or more parallel columns is comprised of two or more plates juxtaposed on one or more planes. Each plate is rigidly fixed to the contiguous plate or plates. The ruby guiding openings for one column of the needle writing ends are obtained by shaping and grinding the sides along which two plates are juxtaposed and fixed. At least one of the plates comprising the ruby has a different height in relation to the remaining juxtaposed plate(s). Thus the ruby presents two ground surfaces used for accurately positioning the ruby into a housing in the nose end of a guiding needle head. Alternately the guiding ruby, though comprised of plates of equal height, can still present two reference ground surfaces by juxtaposing and fixing at least two of the plates in a staggered manner so as to expose precisely ground surfaces utilized to accurately position the ruby into its housing.

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First Claim