Ampex 351 - Page 49

Section 6
TAPE TRANSPORT MECHANISM
6-1
TAPE SUPPLY AND TAKE-UP SYSTEMS
From the supply reel, on the left side of the
t;\pc transport as the operator faces the equip 
ment, tape is delivered to the take-up reel when
the PLAY or FAST FORWARD buttons are
pressed, tape is rewound onto the supply reel
when the REWIND button is pressed. Proper
tape tensioning is maintained during all modes
by means of two induction torque motors.
The reel idler assembly on the supply side
of the tape transport is composed of a pulley,
a spring-pivot-mounted arm and a flywheel for
smoothing out transient speed variations in the
supply turntable assembly.
On the take-up side of the tape transport,
the tension arm assembly with a spring-pivot 
mounted arm performs two main functions.
The first function of this assembly is to provide
a small tape storage loop which prevents tape
breakage during the starting and stopping of
tape motion. Secondly, this arm is used to stop
89-0131
89-0144
Issue A
GENERAL
The tape transport mechanism provides tape
motion for all modes of operation. Interaction
of four basic assemblies and their associated
components — the tape supply system, the tape
take-up system, the tape drive system, and the
control circuit — insures smooth, positive move 
ment of the tape across the head assembly, and
proper tape tension. All tape motion controls,
a reel size selector, a safety microswitch and
the head assembly arc located on the tape
transport.