The reroll mechanism automatically rerolls the note sheet when the piece is finished.
Referring Fig 27, it will be seen that when the reroll hole in the note sheet comes over the 8T hole in the tracker bar, atmosphere is admitted to the underside of the reroll valve A.
The raising of valve A admits suction to the reroll pneumatic which collapses and throws the transmission to the reroll position.
When the reroll pneumatic has collapsed somewhat more than half way, it opens the pallet valve 3 which springs the action cut-out valve valve in the high pressure reservoir and this cuts off suction to the pedal regulator and thus to the reroll valve A.
The reroll pneumatic thereby cuts itself off before it has completely collapsed, but its motion is completed by the little double acting spring C, Fig. 25, attached to the reroll level on the transmission frame.
As the pedal regulator supplies suction to the tracker pneumatics and the music roll brake, these also are cut out during the reroll.
When the reroll pneumatic collapses, the pallet valve 5 closes, thereby causing the reroll speed pneumatic to collapse.
The reroll speed pneumatic is always connected to pump suction through a No. 65 bleed, the effect of which is nullified when the pallet valve 5 is open, that is, during playing.
Electric Switch and Repeat Systems [page 52]
In starting a roll the electric switch is turned
on by hand, but when the roll is rewound and free from the take-up spool,
this switch is shut off automatically.
When it is not desired to "repeat" the playing of the roll, the note sheet rerolls at full speed throughout its length, disengages the ring from the take-up spool, then automatically resets the transmission to the "play" position and shuts off the electric switch.
When it is desired to repeat the playing of the roll, the
note sheet rerolls at full speed until about fifteen turns of paper remain
on the take-up spool, when it slows down for the rest of the way, and before
the ring is disengages from the take-up spool the transmission is thrown
back into the "poay" 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.
The pallet valves which control the operation of
the elctric switch also control the operation of the "repeat" mechanism
so that the two are very closely related.
Referring to Fig. 27, it will be seen that valve
D which control the switch penumatic and also the repeat pneumatic, only
has suction supplied to it from valve C during reroll when the repeat switch
is set at "On" or when the 5B hole in the tracker bar is open.
Repeat Switch at "On." During
"reroll" 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 port x_negatives 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.
As 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 springs valve D which has a supply
of suction due to the fact that pallet 4 is open and connected through
the repeat switch.
Under these conditions the repat pneumatic rapidly
shifts the transmission 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 D drips and the switch pneumaitc returns to its open position.
When repeat switch is turned to the "Off" position,
the tube leading from pallet 4 to valve C is cut off. This valve
C can now only be controlled by 5B tracker hole. The tube leading
from pallet 1 to the "reroll" speed pneumatic is also cut off.
Repeat Switch at "Off." With
the repeat switch at the "Off" position, on rewinding, when the last 15
turns of paper remian 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.
When the tapered end of the music roll uncovers
the spool broove as it unwinds from the spool, the pallet control lever
drops into the groove and positions pallet 2 to operate the valve D.
Valve D however, does not operate at this instant as it has no supply from
valve C.
When the paper uncovers the 5B hole, atmoshphere
admitted to the valve C causes this valve to supply suction to valve D.
The atmosphere, already communicated to the valve D pouch causes it to
raise and admit suction simultaneously to the repeat pneumatic and the
switch pneumatic.
This operation taking place so late allows
the pepr to inhook from the take-up spool. The transmission is meediately
moved to the "play" position and the switch pneumatic slowly collapses
and shuts off the electrical power.
This method of cotrolling the switch pneumatic is
a precautionary measure. Should the ring pull off the music roll,
or should the repeat fail to funtion, the player will automatically shut
off.
The operating block under palllet 1 is in correct
adjustment whien it allows its pallet to close its holes when there are
15 turns of paper on the take-up spool.
The operating block under pallet 2 is in correct
adjustment when it allows the pallet to close its holes just before the
control lever is pushed out of the groove in the take-up spool by the paper.
This adjustment can be made very accurately by turning
the contact screw in the operating block.
It is a great convenience to have the levers set
automatically in the "play" position and to not have to wind the note sheet
around the take-up spool.
It is unnecessary to hold the reroll level when
turning on the electric switch.
As will be seen, the mechanism for accomplishing
these various functions is fundamentally extremely simple and not liable
to get out of order.
[image page 54: CONTROL VALVE BLOCK -- Fig. 28
