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MECHANICAL
PRESSURE
OF
PRESSURE
ROLLER
As the Pressure Roller is pressed against the Capstan,
the Capstan rotation is transmitted to the Tape between
Pressure Roller and Capstan.
But when pressure of the
Pressure Roller against the Capstan is insufficient, slip-
ping occurs and the Capstan rotation is not conveyed
smoothly.
Therefore,
this pressure should always be
kept moderate.
Given hereunder are the measurement
and adjustment methods.
Measuring Method:
Instruments Required: Spring Scale, Strong Thread
1. Thread the Tape and place the set into the Playback
mode.
2. Make a loop of the thread and hook the Pressure
Roller Shaft to the Spring Scale with it.
3. Pull the Spring Scale slowly along the straight line
between the Pressure Roller Shaft and the Capstan
2kg Full Scale,
Spring Scale
NOTE:
Pull it along the extension of a-o
ADJUSTMENTS
Shaft, and read the value on the Spring Scale when
the Tape stops running or when the Pressure Roller
moves away from the Capstan.
4. The standard pressure (value on the Spring Scale) is:
(1.3~1.7 kg)
NOTE: The Capstan and the Pressure Roller should be in
parallel.
If they are not in parailel, the Tape
moves up and down between the Pressure Roller
and the Capstan, or only a side of the Tape is
tensioned.
The adjustment is made by correct-
ing the bent Pressure Roller Shaft.
Adjusting Method:
Make the adjustment by use of elongation and contrac-
tion of the Pressure Roller Lever Spring.
Measure pressure of the Pressure Roller and check if it
satisfies the specified value. (Fig. 4)
Pressure Roller
Fig. 4
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