Scully 280B Series - Tension Sensor PWA

Scully 280B Series

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AQdendum

I,

Model

280B

Constant

Tension

Feature

CONSTANT TENSION

1.1

GENERAL

1.2

The

constant

tension

feature

prevents

changes

in

tape

tension

against

the

heads

caused

by

the

varying

amount

of

tape

on

the

supply

reel

or

changes

in

tape

speed.

The

tension

sensor

PWA,

Figure

1,

con-

sists

of

an

opto

coupler

and

an

optical

grating

which

control

the

amount

of

light

which

reaches

the

transistor.

The

optical

grating

is

mechanically

connected

to

the

tension

sensor

dancer

arm.

As

the

dancer

arm

moves

in

response

to

changes

in

tape

tension,

the

tension

sensor

PWA

initiates

changes

in

the

holdback

voltage

applied

to

the

supply

reel.

~

.:;:

..

,~

...

:,

~;r~!;·

202499

A

Figure

1.

Tension

Sensor

PWA

1

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