GB1067718A - Improvements in or relating to the impact adjustment of type-bars in power-driven typewriters - Google Patents

Abstract

1,067,718. Typewriters. OLYMPIA WERKE A.G. Aug. 7, 1964 [Aug. 7, 1963], No. 32218/64. Heading B6F. Type - bar machines; power - assisted type actions.-A power-operated typewriter comprises a plurality of type bars 42, Fig. 1, articulated via links 41, 40, levers 39 and pivoted drive levers 1 carrying the cams 2 cooperating with a continuously rotating roller 37. On depression of a key lever 3 a release 36 connected thereto engages a projection 2<SP>111</SP> on said cam 2 to bring it into contact with the roller 37, whereupon the cam through the intermediary of the lever 1 raises a slide 5 so that one or the other of stop surfaces 12, 13 engage one or the other of screws 15, 16 of an impact adjustment device, the continued rotation of the roller 37 pivoting the cam 2 about projection 35<SP>1</SP> to displace the drive lever 1 to the right to pivot the type-bar 42 for impression. Impact adjustment arrangements.-For impact adjustment of the type bars 42 the typewriter is provided with an adjusting screw carrier 14, Fig. I, having disposed thereon two rows of letter-by-letter adjustment screws 15, 16, one row 15 serving for upper case letter and the other row 16 serving for lower case letters, said rows co-operating with stop surfaces 12, 13, respectively. The impact of each type bar is adjusted by setting the screws to vary the gaps between the screws and the stop surface to thereby control the upward travel of slides 5, which is limited by a rod 8 engaging a slot 5<SP>111</SP> in said slides. Collective adjustment of the impact is effected by rotation of a disc 49, having a cam plate 46 mounted thereon said disc co-operating with a roller 45 to thereby pivot the carrier 14 about a pin 17 to vary the gaps between the screws 15, 16 and stop surfaces 12, 13. In the embodiment shown in Fig. 1, the screws 16 co-operate with the surfaces 13, i.e. for lower case shift, the screws 15 being staggered with respect to the screws 16 by half a letter space. In order to engage the screws 15 with their corresponding stop surfaces 12, when the typewriter is in its upper case shift position a lever 20 attached to the type bar basket is articulated to a lever 23, which for upper case shift is pivoted anticlockwise to rock a further lever 25, Fig. 3, via a spring 33, whose arms 32, 34 engage a pin 26 on the lever 25. The lever 25 has a roller 28 engaging a groove 30 to displace the carrier 14 laterally against a stop pin 19. In another embodiment (Fig. 5, not shown), the screws 15 and 16 are aligned with respect to the slides 5 and the levers 23, 25 are replaced by a single lever 123, which displaces the carrier 14 for case shift pivotally about said pin 17 assisted by a toggle spring 133.