Type drum selector using sliding plates

Claim 1

IN PRINTING APPARATUS INCLUDING A TYPE DRUM CARRYING TYPE MEMBERS MOUNTED FOR DISPLACEMENT RADIALLY OF THE DRUM AND ARRANGED IN ANGULARLY AND AXIALLY SPACED RELATION EACH AT THE INTERSECTION OF A RESPECTIVE ANGULAR COORDINATE WITH A RESPECTIVE AXIAL COORDINATE, A HAMMER OPERABLE TO RADIALLY PROJECT A TYPE MEMBER THEN ALIGNED THEREWITH TO PRINT ON A PRINTING MEDIUM, ADJUSTING MEANS FOR DISPLACING THE DRUM ANGULARLY, ADJUSTING MEANS FOR DISPLACING THE DRUM AXIALLY, AND SELECTOR MEANS OPERABLE THROUGH THE ADJUSTING MEANS TO DISPLACE THE DRUM ANGULARLY AND AXIALLY TO ALIGN A SELECTED TYPE MEMBER WITH THE HAMMER: THE IMPROVEMENT IN WHICH SAID SELECTOR MEANS COMPRISES A SUPPORT PANEL; A PAIR OF RELATIVELY ELONGATED OPERATORS MOUNTED ON ONE SURFACE OF SAID PANEL FOR LENGTHWISE DISPLACEMENT IN ONE LONGITUDINAL DIRECTION IN SUBSTANTIALLY PARALLEL RELATION, EACH OPERATOR BEING IN DRIVING CONNECTION WITH A RESPECTIVE ADJUSTING MEANS; A PAIR OF SELECTOR PLATES EACH MOUNTED ON A RESPECTIVE OPERATOR FOR DISPLACEMENT IN A TRANSVERSE DIRECTION SUBSTANTIALLY NORMAL TO SAID ONE LONGITUDINAL DIRECTION, AND CONSTRAINED AGAINST DISPLACEMENT IN SAID LONGITUDINAL DIRECTION RELATIVE TO ITS ASSOCIATED OPERATOR; EACH SELECTOR PLATE HAVING AN OUTWARDLY OPENING, SUBSTANTIALLY ISOCELES TRIANGULAR NOTCH IN ITS EDGE FACING IN SAID TRANSVERSE DIRECTION, AND THE TWO NOTCHES FACING IN THE SAME DIRECTION WITH EACH NOTCH HAVING AN APEX; A PLURALITY OF SELECTOR FINGERS ARRANGED IN TWO TRANSVERSELY SPACED PARALLEL ROWS EXTENDING IN SAID LONGITUDINAL DIRECTION, EACH ROW EXTENDING ACROSS THE PATH OF MOVEMENT OF THE NOTCH IN A RESPECTIVE SELECTOR PLATE; EACH SELECTOR FINGER BEING MOUNTED THROUGH A RESPECTIVE APERTURE IN SAID PANEL; RESPECTIVE MEANS CONSTANTLY MECHANICALLY BIASING EACH SELECTOR FINGER TO PROJECT FROM SAID ONE SURFACE OF SAID PANEL INTO THE PATH OF MOVEMENT OF THE ASSOCIATED SELECTOR PLATE; RESPECTIVE LATCH MEANS MECHANICALLY LATCHING EACH SELECTOR FINGER AGAINST SUCH PROJECTION; PRINTING PULSE RESPONSIVE ELECTROMAGNETIC RELEASE MEANS OPERABLE, WHEN ENERGIZED, TO RELEASE THE ASSOCIATED LATCH MEANS FROM ONE SELECTOR FINGER IN EACH ROW, IN ACCORDANCE WITH THE DRUM COORDINATES OF THE CHARACTER TO BE PRINTED, FOR PROJECTION OF THE RELEASED FINGERS BY THE RESPECTIVE MECHANICAL BIASING MEANS; AND PRINTING PULSE RESPONSIVE DRIVING MEANS OPERABLE, WHEN ENERGIZED, TO RECIPROCATE SAID SELECTOR PLATES INITIALLY IN A DIRECTION TO ENGAGE A SLOPING SIDE OF THE ASSOCIATED NOTCH WITH A PROJECTED SELECTOR FINGER TO MOVE THE RESPECTIVE SELECTOR PLATE AND ITS OPERATOR IN SAID LONGITUDINAL DIRECTION AN AMOUNT EQUAL TO THE SPACING OF THE RESPECTIVE PROJECTED SELECTOR FINGER, LONGITUDINALLY OF ITS ROW, FROM THE APEX OF THE RESPECTIVE NOTCH.