GB1176306A - Strip Printer - Google Patents

Abstract

1,176,306. Selective signalling. FRIDEN, Inc. 26 Aug., 1968 [2 Oct., 1967], No. 40704/68. Heading G4H. In a paper strip 22 printer each character to be printed is entering into a counter 66 which is then advanced to zero by clock pulses CM, CP produced by an inductively senses toothed index wheel 72 moving with a type wheel 12, and when a count of zero is reached, at which instant the desired character will be adjacent the paper strip, a control signal PH is applied to a print hammer 57, 48. Whenever all the stages of the counter are not in their zero state state an AND gate 98 produces a signal which inverted 106 and used to drive a motor 24 which rotates the type wheel 12 and advances the paper via a worm gear 26, 28 and a friction wheel 32. Whilst the motor is accelerating, having started from rest, the amplitude of the pulses produced by the index wheel 72 and also those produced by a reference projection 86 on it is too small for them to have any effect. Once running speed is attained, the next pulse IM produced by the reference projection sets a trigger 94 allowing subsequent clock-pulses CM, CP to advance the counter 66 to zero where upon printing occurs. Also, but for a delay element 108 power to the motor would, but the delay element 108 maintains the motor energized for a sufficient period after the counter 66 has reached zero for a further character to be entered therein. In this way, if a sequence of characters is to be printed the motor runs continuously until the sequence ends.