Kundo - Kieninger + Obergfell

Fabrik Fur Technische Laufwerke Und Apparate Kundo Kieninger & Obergfell

Rudolf Broghammer

Franz Kaser

An electronic clock emitting half-hourly time signals corresponding to sh' bells comprises an electromagnetic striker driven by a crystal-controlled oscillator via a multistage binary frequency divider whose last several stages, with the exception of the penultimate stage, have outputs interconnected by a logical coincidence gate to generate a succession of output pulses occurring in pairs during the first half of every cycle of a square wave emitted by the final stage. This square wave steps a motor which drives an associated clockwork entraining a multibank rotary switch and alternately closing, for short periods on the full hour and on the half hour, respective contacts which transmit the square wave to a control circuit including an electronic pulse counter. The control circuit, on being triggered by the second half of a wave cycle, emits an enabling signal which unblocks another gate in cascade with the coincidence gate to pass one or more output pulses to the striker for operating same, with simultaneous stepping of the pulse counter which terminates the enabling signal when its count matches a signal code generated by the rotary switch.

Bell-striking clock

An electronic clock emitting half-hourly time signals corresponding to the strokes of ships' bells comprises an electromagnetic striker driven by a normally blocked astable multivibrator whenever the closure of contacts operated by an associated clockwork, stepped by a crystal-controlled square-wave generator, coincides with a half-circle of predetermined polarity of the generated square wave. The multivibrator has a period of approximately 3/4 the duration of a half-circle of the square wave whereby not more than two pulses energizing the striker mechanism can be emitted by it during an unblocking half-circle so that strokes occurring at the ends of a second, third and fourth hour of a four-hour watch will appear in distinct pairs while those on the preceding half-hours will form one or more pairs followed by a single stroke after a larger time interval. The total number of strokes produced in each instance is determined by a comparator receiving the output of an electronic counter, advanced by the multivibrator pulses, together with binary signals generated by a multibank rotary switch entrained by the clockwork.

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Eschbronn-Mariazell, Germany

Rudolf Broghammer