Patent GB-189923339-A (GB)
Title: Improvements in Time and Date Stamps.
Inventor: STOVER JOSEPH WOODMAN
Filed: 1899-11-22
Granted: 1900-11-17
Abstract: 23,339. Stover, J. W., and King, G. E. Nov. 22. Date and time printing stamps.-Relates to a stamp adapted to be actuated by means of an electromagnet for recording the date and time upon a paper strip. Two electromagnetic coils b are secured to a piece b<1>, which is attached by screws 2 to a T-shaped plate b<2>, rigidly fixed to the base a of the stamp. The leads are attached to plates b<5> secured to a block b<4> of insulating- material, fixed to the plate b<2>. The armature b<7> is carried by a lever b<8> mounted upon a rod b<9>, round which is coiled a spring having one end b<13> attached to a vertically-adjustable post b<15>, and its opposite end b<14> bearing against a pin b<16> ; this spring tends to force the armature towards the poles of the electromagnet. A link c<10> is connected adjustably, by means of an eccentric bearing c<15>, to the lever b<8>, and its upper end is pivoted to an oscillating arm c', which supports a circular platen c, the connection between the two being a ball-andsocket joint c<2>. A rod c<4> is secured to the platen, and its lower end is quadrangular in cross-section and passes through an aperture in a plate c' secured to the plate b<2>. By means of these arrangements, the platen is always held in an approximately - horizontal position during the movements of the arm c'. The lever b<8> and link c<10> together form a toggle-lever, which is forced away from the magnet by the action of the weight of the platen and parts connected therewith. When desired, the platen may be operated by means of a spring - controlled hand - piece d, mounted in the frame opposite the lever b<2>. The strip of paper, to be printed, is supported by a curved and centrally-perforated plate e, fitted removably to the lower part of the framing. The printing-mechanism is mounted within a frame comprising two parallel plates f, f<1>, rigidly connected by posts f<2>; the upper plate f is removably attached to a ring f secured by means of screws f to the framing. The printing-mechanism comprises a stationary ring i fitted within the plate f<1>, and rotary ring i<2> and disc i', fitted concentrically within the ring i, Fig. 11. A triangular projection, for indicating the hour, is formed on the ring i', and an arrow-shaped projection, for indicating the minute, is formed on the disc i<1> ; the whole is so arranged as to print, upon the paper strip, a representation of a clock dial. Any suitable means may be employed for rotating the ring and disc ; in Fig. 5, the disc i<1> is connected to an arbor n, and the ring i<2> is driven from the arbor by means of toothed gearing n<1>, n<2>, n<3>, n<4>. In order to minimize the effects of shock during printing, the disc i<1> is connected to the arbor n by means of upright arms i<10>, which frictionally embrace a projection i<12> on the lower end of the arbor, and form parts of a tubular stem supporting the disc i<1>. The disc fits beneath a shoulder formed on the ring i<2>, which is formed with a shoulder abutting against a flange on the fixed ring i. The wheel n' is connected to a sleeve i<7> mounted on the arbor and provided with a perforated flange through which pass pieces i<5> projecting from a tubular stem i<4> on the ring i<2>. The arbor n is driven by any suitable clockwork, and carries fingers g<1>, g', which travel over a dial g. The finger g' is secured to the arbor, and the finger g' is driven from the arbor by means of gearing g<7>, g<6>, g<5>, and g<4>. On the lower side of the plate f<1> are mounted a boss j, Fig. 11, which carries a letter M, and a rotary disc carrying the letters A, P. The disc j<1> is oscillated periodically so as to bring the letters A, P successively into position for printing in conjunction with the letter M ; this oscillation is effected by means of a spring-actuated drum, the movements of which are controlled by pawl and ratchet mechanism. Discs m, o, p, l, printing the year, month, and day of the month, are fitted within the lower side of the plate f<1>, and are adjusted by hand. The platen c is made of metal provided with a rubber pad having six radial arms registering with the printing-discs. An inking-ribbon passes beneath the printing-discs, and is carried by two rollers w, w<1>, mounted in drawers w<3> which are rigidly connected and are fitted within recesses provided within a cylindrical casing t. A glass plate is fitted upon a rim f<20>, projecting from the plate f<5>, and is held in position by a ring f<22>.