hosted on condor3913
 Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info

End-of-Year Fundraising Drive In Progress. Please visit our home page to see this and other announcements: https://www.mmdigest.com     Thank you. --Jody

MMD > Archives > February 2005 > 2005.02.19 > 09Prev  Next


Player Piano Plays During Rewind
By Robert Moore

It sounds as if Steven Hager has tapped his suction box into the wrong
place.  If he has installed a "T" connection in the hose that leads
from the pump to the stack, he has bypassed the cut out box which
prevents vacuum from reaching the stack, thus allowing the piano to
play during the rewind mode.

This would also account for the air motor not getting sufficient vacuum
to rewind the roll.  The cut out box would be closed in the rewind mode
preventing vacuum from reaching the air motor.  He should check to see
if the sliding block inside the cut out box is seated properly.  Since
vacuum was applied in the opposite direction from the way the cut out
box was designed, the block may not be sealing as it should.  This may
explain why the piano plays in rewind after the suction box is turned
off.

There should also be a one-way valve in the suction box which will open
when it is on and will close when the box is off.  When the piano is
played using the foot pump, vacuum will be lost through the suction box
if there is no valve present.  The correct way to install a suction box
would be to tap into the pump directly at a point where vacuum is
always present, before it reaches any other components in the system.

Bob Moore
Orlando, Florida


(Message sent Sat 19 Feb 2005, 15:51:20 GMT, from time zone GMT-0500.)

Key Words in Subject:  During, Piano, Player, Plays, Rewind

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2022 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

                                     
Translate This Page