Broadcast Electronics 3000 Series - Page 139

PRESSURE PADS
The pressure pads ensure the tape remains in contact with the heads.
A
foam plastic is the most commonly used material for the pressure
pads. The compression of the foam provides pressure to wrap the
tape
slightly around the heads. Felt is less frequently used. To
provide pressure on the tape, the felt is mounted on a phosphor
bronze
arm or a spring-loaded plastic block.
The foam may be a single block mounted behind the two openings for
the record and reproduce heads and held in place by ridges cast
into the shell. Alternately, the foam may be in two separate pieces
fastened to a metal or
plastic arm. A third type mounts the foam
on a spring-loaded plastic block. To ensure smooth tape travel,
teflon is usually applied to the face of the foam.
COR.NER. POST
~SPRING
CORtJER POST
SUPPORT J
ARM
6
CORNER POST
CORNER. POST
511\JGLE FOAM BLOCK