Lift (clock)
With the help of the so-called lift , mechanical energy is transferred to the oscillators ( i.e. rate regulators such as pendulum or balance wheel) of a wheel clock, thus preventing them from stopping.
Every oscillator loses energy through friction in the bearing and against the ambient air. In a wheel clock, the oscillator has periodic contact with the wheel train in order to control its sequence. The inhibition takes place , resulting in further loss of friction. In the opposite direction of action , the gear train provided with a drive gives the oscillator a small push at the end of each contact , which compensates for the entire loss of friction.
The lifting typically takes place between the escape wheel (gear wheel, climbing gear or escape wheel) and the inhibiting piece (anchor or rest piece) (see illustration, left). The tips of the anchor pallets are blunt wedges. Each pallet experiences a “pushing forward” when the escape wheel tooth tip is swiveled out. The tip moves over the wedge surface and “lifts” the anchor arm. On the other hand, the swinging of the pendulum connected to the anchor (see figure, right) is supported, it is also “lifted”.
In the co-axial escapement developed by George Daniels in 1976 , the lift is spatially separated from the escapement, so that it has less friction and wear despite the absence of lubrication .
literature
- Otto Böckle, Wilhelm Brauns: Textbook for the watchmaking trade. Work skills and materials. 8-10 Edition. Wilhelm Knapp, Halle (Saale) 1951 (reprint, edited by Michael Stern. Heel, Königswinter 2010, ISBN 978-3-86852-288-4 ).
- Hermann Brinkmann: Introduction to watchmaking (= The watchmaking school. Vol. 2). 10th unchanged edition. Wilhelm Knapp, Düsseldorf 2005, ISBN 3-87420-010-8 .
- George Daniels : Watchmaking. Updated 2011 edition. Philip Wilson Publishers, London 2011, ISBN 978-0-85667-704-5 .