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Abstract of GB190214430
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| 14,430. H i g - gins, F. H. W. June 25. Telegraphs. - A
printing-receiver has a type-wheel shaft a provided with h a ratchet- wheel b, which is
driven by inclined surfaces on a forked lever k, Fig. 2, arranged so that, at high speeds,
the lever attains considerable velocity before it strikes the inclined surface of a tooth
of the wheel, and the blow thus delivered causes the wheel to advance rapidly until a
radial face of the next tooth on it is stopped by a radial face on the lever h. Reverse
motion of the shaft a is prevented by a stationary spring-pressed pawl c<1> engaging
another ratchet-wheel on the shaft, this wheel having twice as many teeth as the driving-
wheel b. The lever h carries an armature, and is operated by an electromagnet receiving
the line currents, and a spring, or by two electromagnets. Alternating currents may be
used as described in Specifications No. 25,644, A.D. 1896, and No. 6229, A.D. 1899. Spring
stops x<1>, x<2> limit the move- ments of the lever. Printing is effected by
another electromagnet k, Fig. 6, raising a platform, over which the paper strip passes,
below the type- wheel. The letters and other signs are carried by two type-wheels d, e on
the shaft a, either of these being rendered inoperative by the interposition of a light
shield f between the wheel and the paper. The shield is carried by a frame, sliding on the
printing-platform in a direction parallel to the type-wheel shaft a ; the frame is so
movable by a T-shaped lever 7, pivoted on the platform, that it can be raised against
either of two radial pins 10, 11 on the type-wheel shaft. Synchronous movements.-A
synchronizing-appli- ance consists of a screw-thread r, Fig. 6, on the type-wheel shaft a,
moving a stop parallel to the shaft, until after a few revolutions an arm of the shaft
comes in contact with the stop, prevent- ing further rotation. The printing platform is
then raised, disengaging the stop frcm the screw r, whereupon a spring returns the stop to
its starting position. |
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