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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.
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 ...
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Another important timing value for a flip-flop is the clock-to-output delay (common symbol in data sheets: t CO) or propagation delay (t P), which is the time a flip-flop takes to change its output after the clock edge. The time for a high-to-low transition (t PHL) is sometimes different from the time for a low-to-high transition (t PLH).
In a synchronous counter, the clock inputs of the flip-flops are connected, and the common clock simultaneously triggers all flip-flops. Consequently, all of the flip-flops change state at the same time (in parallel). For example, the circuit shown to the right is an ascending (up-counting) four-bit synchronous counter implemented with JK flip ...
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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