Bell System Practices Plant Series Adjustments page 109

Univer sal Contac t (Select or) Mecha nism
3. 33
(A) CONTACT MOUNTING f!RACKET
THE DRIVE ARM LINKAGE SHOULD BE
VERTICALLY ALIGNED TO PREVENT BINDS.
TO ADJUST
POSITION THE CONTACT MOUNTING BRACKET
WITH ITS MOUNTING SCREWS LOOSENED.
CONTACT MOUNTING
BRACKET
CONTACT BLOCK
CONTACT BLOCK
MOUNTING SCREWS
CONTACT ARM SPRING
ISS 7, SECTION 573-115-700
(B) CONTACT BLOCK
REQUIREMENT
THE CONTACT FACES SHOULD BE IN A
VERTICAL STRAIGHT LINE
TO ADJUST
LOOSEN THE TWO CONTACT MOUNTING
SCREWS. PRESS THE CONTACT BLOCK
TOWARD THE REAR OF THE TYPING UNIT
FIRMLY AGAINST THE SCREWS AND
TIGHTEN THE SCREWS.
REQUIREMENT
THE CONTACTS SHOULD OPEN
EQUALLY WITHIN
TO CHECK
ROTATE CODE BAR CLUTCH
UNTIL IT IS DISENGAGED AND
LATCHED IN STOP POSITION.
MEASURE GAP BETWEEN UPPER
CONTACTS. TRIP CODE BAR
CLUTCH AND ROTATE
OR UNTIL LOWER CONTACT GAP
REACHES ITS MAXIMUM OPEN­
ING. MEASURE THE GAP.
TO ADJUST
POSITION CONTACT DRIVE
ARM WITH ITS CLAMP SCREW
LOOSENED.
DRIVE ARM
CLAMP SCREW
REQUIREMENT
WITH SHOULDER SCREW WHICH CONNECTS
CONTACT ARM TO DRIVE LINK REMOVED
AND SPRING SCALE APPLIED VERTICALLY
UPWARD OR DOWNWARD
MIN. 2 OZS.---MAX.
TO OPEN EITHER CONTACT.
0.010 INCH
DEGREES
180
5 OZS.
Page 109