Bell System Practices Plant Series Adjustments page 38

SECTION 573-127-700
2. 26 Tight-Tape Switch Assembly (28B Unit)
NOTE I
FOR ALL ADJUSTMENTS ON THIS PAGE, START-STOP
LEVER (IF PRESENT) MUST BE IN RUN POSITION.
(D) TIGHT-TAPE BAit YIELD SPRING
TO CHECK
OPEN TAPE LID. HOLD SWITCH AC­
T U ATOR IN POSITION WITH FINGERS.
REQUIREMENT
MIN. 2 OZS.
MAX. 3-1/2 OZS.
TO SEPARATE BAILS.
TIGHT-TAPE
INTERMEDIATE BAIL
TIGHT-TAPE
SWITCH CONTACTS---
�
MOUNTING
SCREWS
Page 38
(C)
(A) TIGHT-TAPE SWITCH BRACKET
TO CHECK
TIGHT - TAPE BAIL
REQUIREMENT (FINAL)
TO ADJUST
(B) TIGHT-TAPE SWITCH
(1) REQUIREMENT
TO ADJUST
(2) REQUIREMENT
TO ADJUST
TIGHT-TAPE ARM
REQUIREMENT
TIGHT-TAPE SWITCH CONTACTS SHALL OPEN
WHEN TIGHT-TAPE ARM IS RAISED:
MIN. 0.045 INCH
MAX. 0.075 INCH
ABOVE TAPE-GUIDE PLATE.
TO ADJUST
WITH CLAMP SCREW FRICTION TIGHT, POSI­
TION BAILS, BY MEANS OF PRY POINT, TO
MEET REQUIREMENT.
LOOSEN CLAMP SCREW, AND MOVE TIGHT-TAPE
ARM ADJUSTMENT TO CENTER OF ITS RANGE.
MIN. 0.006 INCH
MAX. 0.015 INCH
CLEARANCE BETWEEN SWITCH ACTUATOR AND
BAKELITE PAD ON SWINGER.
AFTER COMPLETION OF TIGHT-TAPE ARM
ADJUSTMENT
MIN. 0.006 INCH
CLEARANCE BETWEEN SWITCH ACTUATOR AND
BAKELITE PAD.
WITH SWITCH BRACKET MOUNTING SCREWS
FRICTION TIGHT, POSITION BRACKET. TIGHTEN
SCREWS AND RECHECK REQUIREMENT.
NOTE 2
MAKE THIS ADJUSTMENT BEFORE ASSEMBLING
SWITCH TO UNIT.
MIN. 0.050 INCH
MAX. 0.070 INCH
CLEARANCE BETWEEN SWITCH BACKSTOP AND
BAKELITE PAD ON SWINGER WHEN SWITCH CON­
TACTS ARE CLOSED.
BEND SWITCH BACKSTOP WITH TP110445 SPRING
BENDER.
MIN. 3 OZS.
MAX. 4 OZS.
TO JUST SEPARATE CONTACTS.
BEND CONTACT SWINGER WITH A TP110445 SPRING
BENDER.