Ampex 351 Series - SECTION 5 TAPE TRANSPORT MECHANISM; TAPE HANDLING SYSTEMS

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SECTION 5
TAPE TRANSPORT MECHANISM
GENERAL
Th e tape t ranspo rt m ec han i sm provides tape
motion for a ll modes of operation . I nteractio n
of four basic assemblies an d th e ir associated
components - the tap e supply system, the tape
take- up system, the tape drive system, an d lh e
control circuit-insur es smoo th , posiUve move-
m e
nt of the tape across the h ea d assembly, and
p roper tap e tension. All tape motion contro l s,
a ree l size se lector, a safety microswHch a nd
th e h ea d assemb ly are located on the tap e
tran sport.
TAPE SUPPLY AND TAKE-UP SYSTEMS
From the supply reel, on th e left si de of the
tap e transport as the operator faces the equip-
ment, tap e is delivered to the take-up reel when
the PLAY or FAST .FOHW/\RD buttons arc
pressed , t ape is rewound onto the supply reel
when th e REWIND butt on is pressed. Proper
tape tensioning is maintained during all modes
by means of two induction lorguc motors.
The reel idler assemb ly on the supp ly side
of the tape transport is composed of a pu lley.
a spring-pivot-mounted arrn and a flywhcol for
smoothing o ut transient speed variations in the
supply turntable asscm bl y.
On the take-up s id e of the tape transport ,
the tension arm assembly with a spring-pivot -
mounted arm performs two main functions.
Th e first function of this assemb ly is to provide
a small tape st orage loop which prevents tape
breakage during the starting and stopping of
tape motion. Secondly , this arm is used to slop
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