Repeater (horology)
A Repetitionsschlagwerk (Latin Repetiré: repeat ) also Rufschlagwerk or Zugschlagwerk called is an integrated in a clockwork mechanical chime (synonym percussion), which can be triggered at any time by pulling a cord, pressing a button or slider, and then the elapsed strikes hour, quarter hour and minute, if necessary, on a bell or gong.
Description
By using the principle of computing the impact mechanism with relay triggering the signal can be repeated at will. The Repetitionseinrichtungen can also be associated with self- striking mechanisms that are triggered periodically by clockwork. The calculator controls the number of hammer blows on the gongs or bells. In place of the calculator, there used to also lock washers - impact systems, which could hit wrong, if you feigned the pointer.
Watches with quarter or minute repeater have at least two gongs. Repetitionsuhren with more than three gongs or bells for the hour, quarter hour and minute is called Glockenspiel ( Carillon double or Cathédrale ). In a large percussion (French Grande Sonnerie ) the ringing takes place both themselves as well as hitting the trigger stroke.
Since the impact mechanism can be operated any number of times, the necessary energy is supplied by the press of the clock. The key travel and effort is therefore significantly larger than eg the stop system.
History
The oldest known Repetitionsschlagwerke date from the year 1676 by Londoners watchmakers Edward Barlow (1636 -1716 ) and Daniel Quare ( 1648-1724 ). Typically, the release lever of the computational impact mechanism is extended to beyond the edge of the board of the movement, so that this extension can be pulled down, which leads directly to a lifting of the other end of the release lever and thus triggers the Repetitionsschlag. In Wristwatches with Repetition is usually a slider is to the left side on the watch case.
The Repetitionsschlagwerk was written at a time when there were no luminous hands and you could not just make light quickly, if you wanted to know the time during the night. From this historical function out there today often the possibility to attach a string to the trigger of the Repetitionsschlagwerkes. If the other end of the string then tied, for example, the bedpost, then you can follow the time from the Repetitionsschlag without having to get up from the bed.