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The servo angle measurement fixture provides a means for holding a piece of magnetic tape in an extremely precise manner in order that accurate measurements can be made.
English (United States)
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Servo Angle and Tape Measurement Fixture
The servo angle measurement fixture provides a means for holding a piece
of magnetic tape in an extremely precise manner in order that accurate
measurements can be made.
Helical scan recording devices, such as the read/write deck in the IBM 3850
Mass Storage System, depend upon prerecorded magnetic signals on the tape
for their proper operation. These prerecorded magnetic signals, called servo
tracks and I/O blocks, must be recorded in a very precise manner or the
performance of the read/write device will be degraded or even fail.
This servo angle and tape measurement fixture is designed to overcome the
problems encountered when attempting to precisely hold the tape for
Precision flat main plate 2 provides a continuous reference surface against
which the reference edge of tape T, shown in broken lines, is positioned. Tape T
is held in this position by compliant spring guides 4, at opposite ends of support
platform 24, which bear against the nonreference tape edge at each of four air
The tape is held at both ends of the fixture by vacuum clamps 8 and 10.
Fixed edge guides 12 are provided at these clamp plates to align the tape
accurately as it is being mounted. Adjacent air bearings 6 and vacuum columns
16 and 18 provide a decoupling action for any slight distortion caused by the tape
mounting on the vacuum clamp plates. The vacuum columns also provide the
closely controlled tension required for mea...