[pianotech] Curiously curvaceous repetition lever

[Overs Pianos]

Susan,

>. . . Might there be a small coil spring hidden inside
>the curve, pushing directly against the top part of the jack?


I believe your speculation regarding a spring is correct, but it will 
be the repetition-spring which is doing the work for the jack return 
also. Notice that the rep' spring runs through what is almost 
certainly a slotted wippen heel. There must be a loop cord which we 
can't see, which is attached to the front of the jack (on the 
key-front side of the jack-centre), so that the spring provides the 
reverse jack rotation which is required to return it under the 
knuckle after lett-off. This is an interesting concept, because with 
this arrangement the jack escapement will be running in the same 
direction as the rotation of the roller as the let-off point is 
approached. Let-off should be a little less obvious in this action 
than it is with a conventional arrangement. The idea of the lower 
repetition-lever-centre is almost certainly intended to lower 
friction between the knuckle and repetition lever during the let-off. 
But I suspect that the centre has been lowered to such a degree that 
there may well be some friction in the opposite direction to that 
which is usual, with respect to a 'standard' action.

Ron O.
-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
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