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The Keys in an Upright Player Piano must be properly balanced for them to move up and down as the player mechanism is playing the piano. The exception to this general rule is any player piano in which the mechanism that activates the piano action is located below the keys and strikes the keys from the underside. Also, the key lock MUST be in the OFF position if the unit is equipped with such a feature. At 10:47 2/5/98 -0800, you wrote:
Mr. Tuttle,
This unit was restored several years ago and plays wonderfully. When
playing a roll, the keys have a slight downward motion but are not fully
depressed as I have seen on other players. Should the keys fully depress
when playing a roll? If so, any ideas why this unit doesn't?
The Knappert Family
Hello, My first test would be to remove the actions of both the player and the piano
(in the upper part of the piano) to see if the keys fall forward on their own. If they don't, my next test
would be to check the balance of the keys outside the piano. By removing
a few keys and placing them one at a time on a simple jig, it would be
easy to determine the dynamic balance of the keys. If they consistently
fall forward then the problem would have to be the balance rail pins, the
front rail pins or the associated key bushings. There are a variety of
corrective actions or changes that can be employed to insure that the keys
will work as you expect they should but selecting that action is totally
dependent on the results of the tests described above.
If the keys do not fall forward outside of the piano, the most common solution to the problem is to install lead weights on top of the keys just forward of the fulcrum. Musically,
Our family enjoys a 1910 A.B. Chase Player Piano, serial #54549.
Thanks for your help, I don't know who else to ask.
It must be understood at the outset that in an upright player
piano, it is gravity that makes the keys move. They are not physically
connected to the player mechanism or the piano action. Further, they only
move in response to the fact that all the weight of the piano action (the
parts associated with each note) is removed from the back of the key by
the action of the player mechanism 'lifting' the wippen and associated
abstract. Before an accurate solution can be suggested, the exact nature
of the problem must be ascertained.
If they do fall forward outside of the piano, the problem is most likely rust on the key guide pins (front or center rail) or the key bushings are too tight and must be relieved by a professional technician.
John A. Tuttle
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