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A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology – the study and measurement of time and palette – and the Italian ...
The Cifra 5 clock was the progenitor of a full-fledged family of industrial-type clocks, awarded the Compasso d'Oro in 1956. [ 6 ] [ 5 ] [ 1 ] With the help of Belgian inventor John Meyer, a roll of 48 pallets was achieved, leading to the creation of the smallest direct-reading clock, the iconic Cifra 3, ideal for keeping at home or in the office.
The Signaltron main departure board at Praha-Smíchov station, Czech Republic (2012), manufactured by Pragotron Schematic of a split-flap display in a digital clock display An animation of how a split-flap display works Flap departure board at Gare du Nord, Paris (2007) Section of a split-flap display board at Frankfurt (Main) Hauptbahnhof (2005) Enlarged inner workings of a split-flap clock
Flip-Flops that read in a new value on the rising and the falling edge of the clock are called dual-edge-triggered flip-flops. Such a flip-flop may be built using two single-edge-triggered D-type flip-flops and a multiplexer, or by using two single-edge triggered D-type flip-flops and three XOR gates.
Twemco is the world's leading manufacturer of automatic flip clocks and its products became a symbol of Hong Kong precision engineering during the mid-20th century. [3] [4] The company claims to have sold almost 1 million clocks. [5] The design of Twemco's desk clocks resembles that of the world's first flip clock, the Cifra 3 designed in Italy ...
Cifra 23 by Solari di Udine, known for its stylish design, digital flip clock dated Sixties, used in airport Paris-Orly and Warszawa Centralna railway station. Split-flap display at 30th Street Station in 2013, since moved to the Railroad Museum of Pennsylvania Display at the Museum of Modern Art
If the output of the flip-flop is low, and a high clock pulse is applied with the input being a low pulse, then there is no need for a state transition. The extra computation to sample the inputs cause an increase in setup time of the flip-flop; this is a disadvantage of this technique. [3]