1961 American Telephone and Telegraph Company Printed in U. S. A. AND BASE LUBRICATION CONTENTS. A. Sequence Selector Unit...

Transcription

1 1961 American Telephone and Telegraph Company Printed in U. S. A. BELL SYSTEM PRACTICES Teletypewriter and Data Stations SECTION P Issue 1, June, 1961 AT&TCo Standard 28 SEQUENCE SELECTOR UNIT AND BASE LUBRICATION CONTENTS PAR. NO. 1. GENERAL LUBRICATION DETAILS A. Sequence Selector Unit B. Sequence Selector Base, Motor, and Gears C. Variable Features ASSOCIATED BELL SYSTEM PRACTICES. 3.1 I. GENERAL 1.1 This section contains the specific lubrication procedures for the 28 sequence selector unit, base, gears, and motor. The material herein, together with the section entitled Teletypewriter Apparatus, Lubrication, General Information and Routines, provides the complete lubrication information for maintenance. The lubrication symbols used herein are the same as those in the general section. However, the simple symbol is used in this section to mean only one drop of oil. Symbols, such as 2, 3, or 4, are used herein to specify that two, three, or four drops respectively are to be applied at the points indicated. 1.2 The apparatus should be lubricated before being placed in service, as specified in the section entitled Preparation of Teletypewriter Apparatus for Installation. After a few weeks in service, it should be relubricated to make certain that all specified points have lubricant. Thereafter, because of varying conditions, at each station, the apparatus should be lubricated as often as specified by the local instructions. The following lubrication interval is suggested as a guide for use under normal operating conditions. Operating Speed (Words per Minute) SEQUENCE SELECTOR UNIT AND BASE P LUBRI Lubricating Interval (Whichever Occurs First) 3 hours or 1 year 24 hours or 9 months 15 hours or 6 months

2 2. LUBRICATION DETAILS A. Sequence Selector Unit 2.1 Sequence Selector Unit, Rightside View.;"'.;.,. y

3 V> > < :r ;::;, r <(' < :r "" > m > () ;o V> :r :r m m z: i); '6 () r ;o c z < () G"l :r < u r m < m ;o 28 SEQUENCE SELECTOR UNIT AND P BASE LUBRI N N Ul t'l ii n,

4 2.3 Codebarpositioning Mechanism 2 GUIDE SLOTS SHIFT LEVERS 2 ENGAGING SURFACE SHIFT AND TRANSFER LEVERS 2 BEARING GUIDE SLOTS TRANSFER LEVER GUIDE BEARING (6 SLOTS) 2 ROLLER BEARINGS SHIFT LEVER LINK ROLLERS (4 ROLLERS) SAT FELT WASHERS SHIFT LEVER LINK SHAFT (2 WASHERS\ HOOKSEACH END SPRING (5 SPRINGS) 2 GUIDE SLOTS INTERMEDIATE ARMS AND (5 SLOTS) TRANSFER LEVERS 2 BEARING SURFACES SHIFT LEVERS (2 PLACES) 2 BEARING GUIDE SLOTS INTERMEDIATE ARM GUIDE (5 SLOTS) BEARING SAT FELT WASHER SHIFT LEVER LINK 3 OIL HOLE SHIFT LEVER DRIVE ARM SHAFT

5 2.4 Selector Mechanism ' 2 BEARING GUIDE SLOTS (5 SLOTS) SAT FELT WICK 2 ENGAGING SURFACES (5 LEVERS) 2 GUIDE SLOT 2 WICK 2 GUIDE SLOTS HOOKSEACH END (12 SPRINGS) FILL CUP (A VDID AIR LOCK) 2 BEARING GUIDE SLOTS (6 SLOTS) PUSH LEVER GUIDE BEARING SELECTOR WICK PUSH LEVERS MARKING LOCK LEVER LUBRICATOR II'ICK SELECTOR AND PUSH LEVERS SPRINGS LUBRICATOR RESERVOIR SELECTOR LEVER GUIDE BEARING O:CLLI ' Z: wt J.,z :::> '' z :::> Cl.,!13 ::'I<(.Ju ll) ("I) ll) t ("I) Oll

6 ltlol! C: u N t.n,, w,,, Ul It,tl r:: It :s n It Ul It it n ().,!" c C> a, :: It PI " ttl.. a,, t::: < ;!" co

7 Ul (t.c r:: (t ::1 n (t Ul (t ; n "1 28 SEQUENCE SELECTOR UNIT AND BASE P LUBRI ration

8 2.7 Main Shaft!lAIN SHAFT GEAR 2 BALL BEARING MAIN SHAFT BEARING

9 2.8 Main Shaft SAT FELT WASHER ( 2 WASHERS) ECCENTRIC FOLLOWER ARM BEARINGS Uf I 4 INTERNAL MECHANISM CLUTCH ASSEMBLY ( 2 CLUTCHES) SAT FELT WICKS BEARING SURFACES ( 2 CAMS) ARM CAMS ECCENTRIC FOLLOWER!!Iilii H iiiiii liiii Hi Jii\ [jo2 CAMMING SURFACE FLKTlc:NCAM BALL BEARING BEARING SURFACES ( 2 CLUTCHES) CAMMING SURFACES ( 3 DISKS) MAIN SHAFT BEARING CLUTCH SLEEVE CLUTCH DISKS CX:OLIJ!.Z oz a:o t;<tcaco WI.J,z V>=> u z :::> C1 V> :J4, Ju LO M LO.J. (f) a

10 2.9 Selector Cam Clutch,._ SAT FELT WASHERS ( 2 ASHERS) SELECTOR CAM ASSEMBLY 2 CAMMING SURF ACES CLUTCH DISK SELECTOR CLUTCH SELECTOR CAM

11 2.1 Tripshaft,r 2 ENGAGING SURFACES ( 2 LEVERS) CLUTCH TRIP LEVER 2 ENGAGING SURFACES ( 2 LEVERS) CLUTCH LATCH LEVER HOOKSEACH END,SPRINGS ( 3 SPRINGS),. SAT FELT WASHER AND WICK SAT FELT WASHERS ( 4 WASHERS) CAM FOLLOWER ARM ROLLER CLUTCH TRIP LEVER SHAFT o:ol&j ozu1ii: 1<!c::(CC!::cc, z (I) :::I () z :::> 1S 1. M 1.,.; M a

12 2.11 Functionreset Bail Mechanism r HOOKEACH END ( 2 SPRINGS) ;SAT FELT WICKS ( 2 SPRINGS) SPRINGS SPRINGS SAT FELT WASHERS ( 2 BEARINGS) CAM SHAFT 2 BEARINGS ( 3 ROLLERS) SAT FELT WASHERS (EACH END) FUNCTION BAIL ROLLERS DRIVE LINK ( 2PIVOTS) G ENGAGING SURFACE SAT FELT WASHER FUNCTION BAR RESET BAIL FUNCTION CAM ROLLER CAM ROLLER BRACKET LINK

13 2.12 Stripper Bail Mechanism,2 BEARING SURFACES ( 2 BEARINGS) CAM ARMS SAT FELT WASHoRS ( 4 ASHERS) DRIVING CAM G engaging SURFACES I 2 ARMS) CAM ARMS r G ENGAGir:G SURFACES (EACH ARM) CONTACT ARM r 2 GUIDE SLOTS FUNCTION PAWLS 2 GUIDE SLOTS FUNCTION LEVERS 2 GUIDE SLOTS SAT EACHFELT WICK /, """:> HOOKSEACH END 2 ENGAGING SURFACES ( FRONT AND REAR ' G CAMMING SURFACES I 2 CAMS) ' SAT FELT WASHER FUNCTION BARS FUNCTION PAWL SPRitlGS SPRING FUNCTION BARS DRIVING CAM STRIPPER BLADE DRIVING ARM o:c oz<r t;ct UJI. wz <r>=> UJ u z UJ ::::> a UJ ro

14 Stripper Blade 2 GUIDE SURFACES (EACH END) STRIPPER BLADE G ENGAGING SURFACES ( 2 PLACES) STRIPPER BLADE

15 2.14 Codebarpositioning Mechanism 1+.,. 2 ENGAGING SURFACES CODE BAR FORKS 2 ROLLER AND PIVOT FUNCTION SLIDE ' I" ;i > 2 SLIDING SURFACES FUNCTION SLIDES ENGAGING SURFACES FUNCTION SLIDES C:Q\IJ ozci) t, \.I.! t J LU Z V>=> LU u z w :::> l;l ' 1 ('I) It), o::i' ('I) C>

16 2.15 Codebar Mechanism. 2 GUIDE SLOT CODE BARS HOOKS EACH END (3PLACES) SPRING

17 ("J Q r:r I», a: n :r I» E!. a., co em rz rc> co > r r V> n m [JJ > ;o m l m z 1 28 SEQUENCE SELECTOR UNIT AND BASE P LUBRI

18 2.17 Front Bellcrank +====z1 2 ENGAGING SURFACES (2 PLACES) FRONT BELL CRANK 2 BEARING SURFACE FRONT BELL CRANK HOOKS EACH END SPRING

19 28 SEQUENCE SELECTOR UNIT AND P Pal!'e 19 BASE LUBRI CATION N E:: " I» ::1 Q. C'l Ill I», Cll Ill. c g n Ill Cll Ill li" n " t:tl I»!I v'l: II> :s Q., C'l Ill I»,

20 ::> 2.19 Gears Note: For detailed lubrication information of the motor unit, refer to section entitled 28 Motor, Lubrication. G TEETH (2 GEARS) INTERMEDIATE GEARS ', ); ' ' _.::/' 2 BALL BEARING INTERlEDIATE GEAR SHAFT " v

21 C. Variable Features 2.2 Universal Contacts (MakeBreak) 2 BEARING SURFACE LATCH CAM SURFACE CAMS LATCHING SURFACE LATCH LEVER G ENGAGING SURFACE INSULATOR HOOKS EACH END SPRING l BEARING SURFACE LATCH LEVER o:c w Oz (/)a: t;cl: t: _,J wz <I>=> w '' z w => w "" 1. () 1. () a

22 22 Pages 3. ASSOCIATED BELL SYSTEM PRACTICES 3.1 The following Bell System Practices provide additional information that may be required in connection with this section. Subject Teletypewriter Apparatus, Lubrication, General Information and Routines Teletypewriter Apparatus, General Requirements and Procedures Teletypewriter Apparatus, Disassembly and Reassembly, General Information and Routines Teletypewriter Tools and Maintenance Supplies Teletypewriter Apparatus, Preparation of Apparatus for Installation Alphabetical Index of 28type Equipment, Bell System Practices, and Associated 28 ASR Station Drawings Section P3.11 P3.12 P3.13 P3.31 P33.14 P34.1