Patent GB-190617546-A (GB)
Title: Improvements ind and relating to Time Recording Apparatus.
Inventor: HEWITT THOMAS PETER
Filed: 1906-08-03
Granted: 1907-08-03
Abstract: 17,546. Hewitt, T. P., and Hewitt, C. J. Aug. 3. Tell-tale clocks.- Relates to apparatus for recording the time of railway signals, and applicable also to speedometers, workmen's time - recorders, and the like. A clock-work train ends in a seconds' spindle which releases a separately-driven clock train every tenth of a minute to set the printing-wheels, of which there are two sets of three each for hours, minutes, and tenths, adapted to print on a tape when the signal operates either of a pair of platens, the operation of which releases a third train to feed the strip. The time-keeping mechanism, driven by a fusee 1<a>, Fig. 4, ends in an eccentric 4<a> rotating once in twelve seconds and engaging the forked arm 5<a>. This arm is pivoted at 6<a> and has arms 7<a> adapted to release every six seconds, the balanced tooth 8<a> terminating the second clock train, which is driven by the fusee 2b, Fig. 2, and which drives through the arbor 4<b> and the gearing shown the seconds' hand 8<b> and the hour and minute hands of the clock. The pallet 7<a> can be raised, to release the tooth 8<a> and let the clock run down to show the correct time, by means of a lever 9<a>. The arbor 7<b> driven by the train from 2<b> carries two pinions 15<c> to drive the pinions 1<c>, 4<c> on the sleeves of the two tenths of minutes type-wheels, and has a roller arm 16<c>, Fig. 7, to drive the star-wheel 17 on the arbor 18<c> carrying the pinions 19<c> which drive the minute sleeves. The wheel 17<c> is locked by a bent lever 21<c>, the other arm 22<c> of which rides on a cam disk 23<c> recessed so as to allow the spring 25<c> to raise the locking-arm when the arm 16<c> engages the toothed wheel 17<c>. Similar locking and driving arms as shown actuate the hour driving-arbor 28<c>. The extra power required for driving the several wheels on transferring is supplied by a lever 32<c>, Fig. 9, which is raised by a cam 31<c> on the arbor 7<b> against the action of a spring and carries a pawl 34<c> to engage a pin on the cam so as to urge the cam round. To facilitate alinement of the type, sixty numbers are placed on each wheel, the tenths of minutes being repeated six times in order and the hours repeated thus, five ones, five twos, &c. The third clock train driven by the fusee 19<d> feeds the strip by driving the roller, against which the strip is held by the spring-pressed roller 9d, which can be raised by the handle 14<d>. The strip is wound on the drum 5<d>, friction driven by the shaft 15<d>, on which it is held by the adjusting-nut 16<d>; a similar nut 8<d> secures the supply drum on its spindle. The strip is fed only after a signal is given, the platenactuating arms 2<f> carrying adjustable tappets 1<e> which engage arms of a rock-shaft 4<e> having an arm 5<e> which engages the releasing-device shown in Fig. 5 attached to the third train of gearing. The arm 5<e> raises a lever 6<e> so as to release a stop 22<e>, from a catch 23<e>, Fig. 2, on the spindle of a flyer 17<e>, and at the same time to allow a toothed quadrant 8<e> to turn under the action of a spring 10<e>, the clock-work running until a pawl 21<e> has wound the quadrant back to position ; a cam 19<e> is provided to engage a projection 20<e> on the lever so as to raise the stops 22<e> out of locking position till the quadrant is restored. The ink ribbon is wound on the drum 4<g> which is driven by the arbor 5<g>, the supply and winding-on drums being both attached to their spindles by milled nuts as shown.