Printing device for high speed printers
AssigneeSociety Said: LOGABAX
InventorsJean-Pierre Talvard, Bernard Flaceliere, Jacques Bunel
Life of this patent
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Abstract
Printer for printing machine comprising a plurality of styluses arranged in a plane parallel to the writing line and a corresponding number of electromagnets whose armatures cooperate with one end of the styluses mounted in a fixed guide, the other end being driven by a movable guide, characterized by means for subjecting the guide to a first alternating linear movement parallel to the writing line combined with a second alternating linear movement perpendicular to the first one, the amplitude of these linear movements corresponding to an integral number of characters printed in the form of dot matrixes. The invention can be applied to high speed printers operating at 300 to 500 lines per minute.
Claims6
An impact printer for forming dot patterns upon a movable document in a line by line fashion whereby a regular matrix of A dot lines by B dot columns defines each character, A and B being real integers greater than 1, comprising:
- a plurality of N elongated reciprocating styluses each having first and second ends, N being a number obtained by dividing the total number of characters in each line by a whole number including unity;
- a plurality of N electromagnet means cooperating with the first ends of the respective styluses for driving the second ends thereof against the said document at high speed;
- means for selectively energizing said electromagnet means;
- first and second guide members by which the first and second end portions of the styluses are respectively supported at regularly spaced intervals along first and second imaginary straight lines substantially parallel to the dot lines;
- said first guide member being fixedly mounted, whereas the second guide member is mounted for first reciprocating cyclic motion in the direction of the second imaginary straight line and for second reciprocating motion in a plane perpendicular to said second imaginary straight line;
- motor means and a rotating shaft constantly rotated by said motor means when said motor means is energized;
- first coupling means connecting the said shaft to the second guide member and adapted for converting the constant rotating motion of the said shaft into the said first reciprocating cyclic motion, the said first reciprocating cyclic motion being constant and having an amplitude corresponding to the line portion defined by the said total number of characters, divided by N;
- second coupling means connecting the said shaft to the second guide member and adapted for converting the constant rotating motion of said shaft into the said second reciprocating motion, the said second reciprocating motion including a plurality of discrete downward steps each starting before the end of one of the successive half cycles of the first reciprocating cyclic motion and ending after the beginning of the next half cycle, the number of steps in said plurality equalling A-1 and a single step return upward translatory alternation movement starting at the end of the last of the said successive half cycle and ending at the end of the next half cycle, the totality of said downward steps together forming a downward translatory alternation movement having an amplitude equalling the length of a column, the said means for selectively energizing the electromagnet means being operative only during those portions of the first reciprocating cyclic motion are comprised between the said discrete downward steps;
- and means for effecting a step of motion of the movable document during the said upward translatory alternation movement.
Dependencies are inferred from the claim text.