![]() ![]() Having two sets of leaves for each hour also allows the clock to alternate between 12- and 24-hour display, every half hour, like this: 12 am, 0 h, 1 am, 1 h, 2 am, 2 h. There are two of each hour, like this: 12 am, 12 am, 1 am, 1 am, 2 am, 2 am. These leaves have hour numbers printed on them. The slower wheel has connected to it a similar ring of leaves, only there are 48 leaves on this ring. This ring is put into position and rotated so that one page falls each minute, showing a new number for the minutes. The "book" is opened vertically, and its pages form a ring. On the leaves are printed numerals so that, when a person holds two adjacent leaves apart like an open book, the two open leaves spell out a numeral, and flipping a leaf down increases the number shown by 1 unit. The faster wheel has connected to it a ring of 60 flat plastic leaves. The small hook which retains the hour leaves until the top of the hour can be dimly seen, retracted, in the inset. This is a synchronous electric clock which is kept to the correct time by the 50/60 Hz AC power grid. The narrow numbered wheel and knobs on the left are the alarm mechanism. The inset shows the metal tab holding back the top flap. Mechanism of a split-flap alarm clock, removed from its case. The wheels move continuously, not in steps. Method of operation Schematic of a split-flap display in a digital clock displayĪn electric motor (often synchronous, if directly connected to the AC line) turns two sets of wheels continuously via a reduction gear train: the faster at a rate of 1 revolution per hour, the slower at a rate of 1 revolution per 24 hours. People interested in the collection, restoration, buying and selling of flip clocks are known as horopalettologists. The study, collection and repair of flip clocks is termed horopalettology (from horology - the study and measurement of time and palette - and the Italian "orologio a palette" - Italian for "flip clock"). JSTOR ( January 2009) ( Learn how and when to remove this template message)Ĭopal japan 1970s Alarm flip number electric clockĪ 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. ![]() Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. However, only Members will receive credit under "Contributors" above.This article does not cite any sources. You do not need to be a member to comment. Your comment will be review and may become a part of this data sheet.
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