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Bell System Practices Plant Series Adjustments

Transmitter-distributor units
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Summary of Contents for Bell System Practices Plant Series

  • Page 3 ISS 3, SECTION 573-127-700 CONTENTS PAGE 1. 03 In this section, left or right, front or rear, and up or down refer to the apparatus in Tight-tape Switch Assembly (28B Unit) normal operating position as viewed from operator's position in front of the unit. Tight-tape arm .
  • Page 4 SECTION 573-127-700 REQUIREMENTS AND ADJUSTMENTS 2. 01 Cam Shafts (28B Unit) NOTE 1: THE FOLLOWING REQUIREMENTS APPLY TO BOTH THE DISTRIBUTOR AND SENSING CAM SLEEVES. THESE MECHANISMS SHOULD NOT BE DISTURBED UNLESS THERE IS REASON TO BELIEVE THE REQUIREMENTS ARE NOT MET. DRUM MOUNTING DRUM MOUNTING SCREW...
  • Page 6 SECTION 573-127-700 2. 03 Clutch Trip Mechanism REQUIREMENTS APPLY TO BOTH CLUTCH TRIP MECHANISMS. MAGNET BRACKET ASSEMBLY CLUTCH ARMATURE AIRGAP REQUIREMENT AIRGAP BETWEEN ARMATURE AND MAGNET ASSEMBLY BRACKET WITH ARMATURE FLUSH AGAINST MAGNET CORE 0.004 MIN. INCH 0.008 MAX. INCH. TO ADJUST REMOVE ARMATURE-EXTENSION SPRING.
  • Page 7 ISS 3, SECTDN 573-127-700 NOTE: R EQUIREMENTS APPLY TO BOTH CLUTCH TRIP MECHANISMS. REQUIREMENT CLUTCH LATCHLEVER ON LOW PART OF CLUTCH DISC AND UNIT UPRIGHT. SCALE APPLIED TO BENT EAR OF LATCHLEVER HORIZONTALLY. MIN. 1/2 OZ. MAX. 1-1/2 OZS. TO START LATCHLEVER MOVING. CLUTCH DISC LUTCH LATCH­...
  • Page 9 ISS 3, SECTION 573-127-700 NOTE I REQUIREMENTS (A) AND (B) APPLY TO ALL CLUTCHES. STOP LU G CLUTCH TRIPLEVER UPPER EXTENSION REQUIREMENT CLUTCH TRIPLEVER LATCHED (CLUTCH IN STOP POSITION). CLUTCH TRIPLEVER UPPER EX­ TENSION SHALL FULLY ENGAGE CLUTCH-SHOE LEVER. CLUTCH TO ADJUST TRIP LEVER POSITION UPPER EXTENSION,...
  • Page 11 ISS 3, SECTION 573-127-700 NOTE REPLACE DISTRIBUTOR BLOCK. DISTRIB UTOR CONTACT GAP REQUIREMENT CONTACT GAP, WITH CAM FOLLOWER LEVER ON HIGH PART OF CAM� MIN. 0.0251NCH MAX. 0.030 INCH. TO ADJUST TRIP CLUTCH MANUALLY TO POSITION CAM. TURN CONTACT SCREW TO ADJUST. CHECK ALL CONTACTS.
  • Page 12 SECTION 573-127-700 2. 06 Feed Lever REQUIREMENT MIN. SOME MAX. 0.015 INCH CLEARANCE BETWEEN FEED LEVER AND COLLAR SET COLLAR COLLAR WHEN FEED LEVER IS FREE IN ITS GUIDE SLOT. TO ADJUST POSITION FEED LEVER WITH SET COLLAR SHALL SCREWS LOOSENED. FEED LEVER MOVE FREELY WITHOUT BINDING AT GUIDE OR COLLARS.
  • Page 17 ISS 3, SECTION 573-127-700 2.10 Tape-Lid Mechanism (28B Unit Without Tape-lid Spring) TAPE LID NOTE: REMOVE TOP AND TAPE-GUIDE PLATE. LUBRICATE PRIOR TO ADJUSTMENT. WITH TAPE LID HELD AGAINST NOTCH IN TAPE­ GUIDE PLATE: A FEED-WHEEL GROOVE SHALL ALIGN WITH SLOT IN PLATE. HOLE IN TAPE LID FOR TAPE-OUT PIN SHALL ALIGN WITH HOLE...
  • Page 18 SECTION 573-127-700 2. 11 Tape-guide Plate (28B Unit) TAPE GUIDE REQUIREMENT WITH GAUGE PROPERLY POSITIONED: MIN . SOME MAX. 0.003 INCH BETWEEN GAUGE AND TAPE GUIDES . TO ADJUST LOOSEN TAPE-GUIDE MOUNTING NUTS TO FRICTION TIGHT. PROPERLY POSITION GAUGE ON TAPE-GUIDE PLATE. POSITION TAPE GUIDES TO MEET REQUIREMENT.
  • Page 19 ISS 3, SECTION 573-127-700 2. 12 Tape Feed Mechanism (28B Unit) ( A ) FEED-WHEEL DETENT PLATE NOTE I 0 00 o OO 0 00 ooo 0 00 ooo IF UNIT IS EQUIPPED WITH A START- 0 00 ooo TAPE 0 00 ooo STOP LEVER, PLACE IT IN STOP POSI- o oo o oo...
  • Page 20 SECTION 573-127-700 2. 12 Tape Feed Mechanism (28B Unit) (Cont) FEED-PAWL SPRING TO CHECK REQUIREMENT MIN. 1/4 OZ. MAX. 1-1/2 OZS. TO START FEED PAWL MOVING. ADJUSTING SLOT FEED ROLLER FEED PAWL NOTE IF UNIT IS EQUIPPED WITH START-STOP LEVER, PLACE IT IN RUN P OSITION .
  • Page 24 SECTION 573-127-700 2. 16 Sensing Mechanism SENSING PINS (28C UNIT) REQUIREMENT IN STOP P OSITION, HIGHEST SENSING PIN SHOULD BE FlUSH TO 0. 005 INCH BELOW SURFACE OF TOP PlATE. TO ADJUST WITH ClUTCH lATCHED AND YOKE IN lOCKED POSITION, lOOSEN NUT ON ECCENTRIC SHAFT AND ADJUST ECCENTRIC SHAFT WITH HIGH PART OF...
  • Page 25 ISS 3, SECTION 573-127-700 SENSING BAIL SPRINGS TO CHECK WITH BLANK TAPE UNDER TAPE LID, TRIP CLUTCH MAGNET AND MANUALLY ROTATE SHAFT UNTIL SENSING BAIL IS IN UPPER­ MOST POSITION. APPLY SCALE TO BAIL BETWEEN SPRINGS. REQUIREMENT MIN. l/4 OZ. MAX.
  • Page 27 ISS 3, SECTION 573-127-700 2. 18 Sensing Mechanism Springs LATCHLEVER SPRING LATCH LEVER TO CHECK SELECT BLANK COMBINATION. TRIP S EN­ SING CLUTCH AND ROTATE SHAFT TO STOP POSITION. APPLY SCALE AT RIGHT ANGLE TO TOP OF LATCH LEVER. REQUIREMENT MIN.
  • Page 30 SECTION 573-127-700 2. 20 Pivoted Sensing Head TAPE DEFLECTOR SENSING PINS REQUIREMENT THE TAPE DEFLECTOR VERTICAL EARS SHALL PASS FREELY BETWEEN SENSING PINS AS PIVOTED SENSING HEAD IS MOVED AWAY FROM ITS LOCKED POSITION. TO ADJUST POSITION TAPE DEFLECTOR WITH FRONT PIVOT SCREW.
  • Page 31 ISS 3, SECTION 573-127-700 FEED-WHEEL FEED PAWL (PRELIMINARY) RATCHET REQUIREMENT FEED-LEVER FOLLOWER ROLLER SHALL BE OFF CAM WHEN FEED PAWL RESTS AGAINST ITS UPWARD STOP. CHECK-PAWL TO ADJUST ECCENTRIC STUD TRIP CLUTCH AND ROTATE SHAFT UNTIL FEED PAWL IS IN ITS UP- PER POSITION AND BOTIOMED ON ITS STOP.
  • Page 32 SECTION 573-127-700 2. 20 Pivoted Sensing Head (Cant) TAPE-RETAINING LID LATCH ADJUSTING SCREW REQUIREMENT MIN. 8 OZS. MAX. 14 OZS. TO START TAPE-RETAINING LID LATCH SPRING MOVING AWAY FROM TOP PLATE. TO ADJUST BOW LID LATCH SPRING WITH FINGERS. DO NOT REMOVE SPRING FROM YOKE.
  • Page 34 SECTION 573-127-700 2. 22 Tape Depressor and Last-character Contact Switch TO CHECK WITH TAPE DEPRESSOR IN LOCKED POSITION, APPLY SCALE TO LIP AT EXTREME RIGHT END OF DEPRESSOR. REQUIREMENT MIN. MAX. TO START DEPRESSOR MOVING. TAPE-DEFLECTOR SPRING REQUIREMENT MIN. MAX. 1-1/4 OZS.
  • 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. TIGHT-TAPE ARM REQUIREMENT TIGHT-TAPE SWITCH CONTACTS SHALL OPEN (D) TIGHT-TAPE BAit YIELD SPRING WHEN TIGHT-TAPE ARM IS RAISED: TO CHECK MIN.
  • Page 39 ISS 3, SECTION 573-127-700 2. 27 Tape-out Switch Assembly (28B Unit With START-STOP Lever) REQUIREMENT TAPE-OUT SWITCH MIN. 0.008 INCH MAX. 0.015 INCH CLEARANCE BETWEEN NORMALLY OPEN CONTACTS. TO ADJUST FORM UPPER CONTACT LEAF WITH A TP110445 SPRING BENDER. NOTE WHEN REPLACING SWITCH ASSEMBLY, MAKE SURE CONTACT SWINGER IS OVER TAPE-OUT PIN EXTENSION, AND EXTEN­...
  • Page 40 SECTION 573-127-700 2. 28 Tape-out Pin and Bail Assemtily (28B Unit With START-STOP Lever) (A) TAPE-OUT BAIL YIELD SPRING TO CHECK PLACE START-STOP LEVER IN RUN POSITION. (B) TAPE-OUT EXTENSION BAIL SPRING REQUIREMENT TO CHECK MIN. OZS. PLACE START-STOP LEVER IN RUN POSITION. MAX.
  • Page 41 ISS 3, SECTION 573-127-700 2. 29 START-STOP Switch Assembly (28B Unit) START -STOP BAIL YIELD SPRING TO CHECK YIE L D BAIL PLACE START-STOP LEVER IN RUN POSITION . REQUIREMENT MIN. OZS. MAX. OZS. TO SEPARATE BAILS. START-STOP SLIDEARM ASSEMBLY WITH START-STOP LEVER IN RUN POSITION: MIN.
  • Page 42 SECTION 573-127-700 Note: Hold the stop contact open to view the 2. 30 Contact Timing Requirements for Pivoted trailing edge of the No. 5 contact image. Sensing Head (One-cycle Cam) DISTRIBUTOR CONTACTS - STOP AND {c) TO ADJUST: NO. 1 T HROUGH NO. 5 To meet Requirement (2), position the (a) TO CHECK: Use a 1A teletypewriter test...
  • Page 44 S ECTION 573 -127-700 AUXILIARY "A" 75 DIV. f-25 DIV. AUXILIARY "B" Figure 3 - Pulse Length Requirements for Auxiliary Contacts A and B 0 DIV.-1 40 DIV. 30 DIV. 31 DIV. 25 DIV. Figure 4 - Pulse Length Requirements for Storing S witch Contacts No. 1 Through No. 5 (b) REQUIREMENTS: With test set connected t o tape-out con- tact or 6th pin contact of 28B unit and...
  • Page 45 ISS 3, SECTION 573-127-700 (7.42 UNIT CODE) STOP ALIGNED WITH S CALE DIVISION DIY. 50 70 90 10 30 50 �� WC50 FIVE STOP � 70 DIV. � 12 DIV. I- 5 7 DIY. TAPE OUT j.-46 DIY. DIY. CLUTCH TRIp Figure 5 - Pulse Length Requirements for Storing Switch Auxiliary Contacts (28 C Unit) 10 30 50 20 c 60...
  • Page 46 SECTION 573-127- 700 Release the gears and turn the motor on. Check the No. and No. contacts in accordance with the instructions given With the test set connected to the output for the No. and No. distributor contacts ( 4) of the distributor, align the end of the of the pivoted sensing head.

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