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MMD > Gallery > Tech > Ampico > amp52m.htm

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Ampico B Rewind and Repeat System
Ampico B Repeat System Modified
by Robbie Rhodes

    At the end of "reroll" when the tapered end of the roll uncovers the groove in the take-up spool, the pallet control lever drops into the groove and causes pallet 2 to be raised.  Atmosphere through the lower hole under this pallet raises valve C.

   When the paper uncovers the 5B hole, atmosphere admitted to the valve D pouch causes this valve to raise and admit suction simultaneously to the repeat pneumatic and the switch pneumatic.

   Repeat Switch "On."  When it is desired to repeat the playing of the roll, the note sheet rerolls at full speed until about 15 turns of paper remain on the take-up spool, when it slows down for the rest of the way, and before the ring is disengaged from the take-up spool the transmission is thrown back into the "play" position.

   When there are 15 turns of paper left on the take-up spool, the pallet control lever causes pallet 1 to be raised from its port; atmosphere through the port negates the suction being supplied to the reroll speed pneumatic through the No. 65 constriction.  This causes the reroll speed pneumatic to open and allows the roll to reroll slowly from this point.
   The Re-Play pneumatic receives suction via the Repeat switch which bypasses the #65 constriction, so that the transmission rapidly shifts to the "play" position before the ring disengages from the take-up spools and before the constricted switch pneumatic has collapsed.  When the note sheet starts ahead it pushes the pallet control level out of the groove.  As soon as this lever is pushed from the groove, the valve C dips and the switch pneumatic slowly returns to its open position.

   Under these conditions the switch pneumatic, which requires about 5 seconds to close, does not have time to function before the note sheet is wound around the take-up spool again and the pallet valve controlling the switch valve is returned to its seats.

   This method of controlling the switch pneumatic is a precautionary measure.  Should the ring pull off the music roll, or should the repeat fail to function, the player will automatically shut off.

    Repeat Switch "Off."  With the repeat switch at the "Off" position, on rewinding, when the last 15 turns of paper remain on the take-up spool, slowing down does not take place as the tube leading from the lower hole under pallet 1 is closed by the switch.  In this position, the full suction supply is continued on the "reroll" speed pneumatic until the end of the roll.

   The Re-Play pneumatic receives suction via the #65 constriction, so that the transmission slowly shifts to the "play" position.  This operation taking place so late allows the paper to unhook from the take-up spool, after which the transmission is moved to the "play" position and the switch pneumatic slowly collapses and shuts off the electrical power.

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