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Almost all of the extant PianOrchestras are fitted with a standard
6-station roll changer. For these, the revolver part consists of
two opposing cast and machined flanges, with the six sets of fixtures
that hold the music rolls attached.
In the Style 15 PianOrchestra, the 12-station revolver portion
is quite different in construction, and consists of a "chain" of
segments, each of which holds one music roll. This 12-part "chain"
is then supported by a special widely pitched "sprocket" wheel that
guides and moves the individual segments (each holding a music roll)
into place for playing. At the bottom end of the music roll "chain"
is a large hard-rubber edged set of wheels that further guides the
whole dangling "chain" of music rolls, keeping it vertical and clear
of other nearby mechanisms. Although quite heavy, the "chain" idea
works very well, and is as trouble free and reliable as is the standard,
and much more simple, 6-station roll changer.
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