Bell System Practices Plant Series, Adjustments

Page: 105 / 150

ISS 7, SECTION 573-115-700
3. 29
Vertical Tabulation and Transmitter Distributor Control Mechanism (Cont.)
VERTICAL TAB
PAGE FEED-QUT
BLOCKING LEVER (INNER)
PAGE FEED-OUT SLIDE
TRANSMITTER CONTROL SWITCH
TYPE)
SWITCH ASSEMBLY
MOUNTING SCREWS
FUNCTION ARM GUIDE BAR
BLOCKING LEVER
(OUTER)
VERTICAL TAB
SLIDE
RETAINER
'
BLOCKING LEVERS
TRANSMITTER CONTROL SWITCH ( TRANSMITTER CONTROL ONLY)
REQUIREMENTS --- FOR TRANSFER TYPE CONTACTS
1.
WITH NORMALLY CLOSED (LOWER) CONTACTS CLOSED, CLEARANCE BETWEEN INSULATED EXTENSION
OF SWINGER AND LOBES OF FEED-OUT AND VERTICAL TABULATOR BLOCKING LEVER SHALL BE
MIN. SOME CLEARANCE -----------------------------------------
MAX 0.005 INCH
TO CHECK --- ROTATE MAINSHAFT UNTIL FEED-QUT AND VERTICAL TABULATOR
BLOCKING LEVERS ARE UNOPERATED (BLOCKING LEVERS RESTING ON SLIDES).
TO ADJUST -WITH TRANSMITTER CONTROL SWITCH MOUNTING SCREWS LOOSENED, POSITION THE
CONTACT ASSEMBLY.
-2.
WITH THE NORMALLY OPEN (UPPER) CONTACTS CLOSED
(
a
)
.
LOBE OF FEED-OUT BLOCKING LEVER (INNER LEVER) SHALL FULLY ENGAGE INSULATED
EXTENSION OF CONTACT SWINGER.
{b).
THE FEED-QUT BLOCKING LEVER SHALL REST FIRMLY ON THE FUNCTION ARM GUIDE BAR
(INTERNAL --- CHECK BY LIFTING LEVER LIGHTLY AT CONTACT END) AND ALSO SEPARATE
THE NORMALLY OPEN CONTACT SPRING FROM IT STIFFENER AS THE UPPER CONTACT CLOSES.
TO CHECK --- SELECT FEED-OUT CODE COMBINATION, ROTATE MAIN SHAFT UNTIL FEED-OUT SLIDE
IS IN ITS EXTREME FORWARD POSITION AND FEED-OUT BLOCKING LEVER DROPS BEHIND ITS SLIDE
TO CLOSE NORMALLY OPENED CONTACTS.
TO ADJUST --- WITH CONTACT PILE-UP MOUNTING SCREWS LOOSENED, POSITION THE ASSEMBLY.
3. WITH THE NORMALLY OPEN (UPPER) CONTACTS CLOSED
(
a
)
.
LOBE OF VERTICAL TABULATOR BlOCKING LEVER ( OUTER ) SHALL FULLY ENGAGE THE
INSULATED EXTENSION OF THE SWINGER.
(b).
THE VERTICAL TABUL ATOR BLOCKING LEVER SHALL REST FIRMLY ON THE FUNCTION ARM
GUIDE BAR (INTERNAL --- CHECK BY LIFTING LEVER LIGHTLY AT CONTACT END.) AND ALSO
SEPARATE NORMALLY OPEN CONTACT SPRING FROM ITS STI FFENER AS UPPER CONTACT
CLOSES.
TO CHECK--- SELECT VERTICAL TABULATOR COMBINATION AND PROCEED AS IN ITEM TO CHECK
OF REQUIREMENT 2 ABOVE.
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