Teletype BX Technical Manual

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Page 3: List Of Effe,;Ctive Pages
241B LIST OF EFFE,;CTIVE PAGES MARCH, 1960 (Supersedes September, 1957 Issue) PAGE CHANGE IN EFFECT NUMBER Change 1 Original Change 1 C to D Change 1 1-1 to 1-2 Change 1 2-1 to 2-4 Change 1 3-1 to 3-17 Original 4- 2 Change 1 Change 1...
Page 7: Double Unit
115 volts a. c. and 120 volts d. c. sources. This bulletin covers the following for the Teletype Tape Reader: Descriptions, Principles Mounted :>n the same bracket is a 3 5-point output connector which links the Reader with associated of Operation, Adjustments, Lubrication and In...
Page 8: Motor Unit
2418 parallel with the magnet. On the double-reader nection between the base and reader units. model, to provide alternate feeding of tapes, two MOTOR UNIT (Figure 1-1) relays are used (Figure 2-10). The coil of each relay is in parallel with one reader control mag Mechanical motion for the Tape Reader is net and its associated series resistor and the supplied by an a.
Page 9: Principles Of Operation
2418. SECTION 2 PRINCIPLES OF OPERATION GENERAL Reader is conveyed by a permutation code of �· either five, six, seven or eight levels according a. This section describes the operating prin to what variation of the code is being used. Each ciples of the Tape Reader.
Page 10: Drive Parts
241B and the main bail is latched down by the latch rent--because of a blocked rotor, for example The reader is thus in its unoperated con ---excessive heat will be generated in the ther lever. dition as shown in Figure 2-3.
Page 11 241B feed wheel (Figu-re 2-3). The feed pawl is ad plate, and, if there is a hole in the tape above justably mounted on the main bail and is held any pin, it continues to move through the hole in the tape and its slot in the tape lid.
Page 12 2418 wheeling contact is closed (Figure If the DOUBLE UNIT - ALTERNATE FEEDING 2-6). free wheeling button is manually operated, the OF TAPES (Figures & 2-10) following operations occur simultaneously: The free wheeling lever pivots clockwise about its Two relays on the double unit base mounting screw.
Page 13 The letters of values in that they are those that should be ob the alphabet which precede the adjustments indi tained when Teletype scales are used as shown cate the sequence to be followed on a particular in the illustrations.
Page 16 241B MAIN BAIL CENTER GUIDE REQUIREMENT (1) MAIN BAIL CENTER GUIDE POST MAIN BAIL SPRING ALIGNMENT SHOULD BE PARALLEL TO TO CHECK THE MAIN BAIL. PLACE MAIN BAIL MAIN BAIL SHOULD MOVE UP AND IN ITS LOWEST POSITION. DOWN FREELY WHEN ACTUATED BY BAIL DRIVE FOLLOWER.
Page 17 241 B LATCH LEVER POSITION REQUIREMENT OF MAIN BAIL WITH BAIL DRIVE FOLLOWER IN ITS LOWEST POSITION, CLEARANCE BETWEEN LATCH LEVER AND LATCHING EXTENSION OF MAIN BAIL: 0.002 INCH<----MAX. 0.010 INCH TO ADJUST POSITION "U" BRACKET WITH FOUR MOUNTING SCREWS LOOSENED ITWO SCREWS IN EACH FRONT AND REAR PLATES).
Page 19 241B TAPE OUT CONTACT UPPER CGHACT SPRING RIGHT SIDE VIEW (A) TAPE OUT CONTACT (CONTINUED FROM FIGURE 3-5) (2) TO CHECK REMOVE TOP PLATE. REQUIREMENT TO JUST OPEN CONTACT. TO ADJUST BEND LOWER CONTACT SPR lNG. RECHECK REQUIREMENT NO. (1). NOTE: IF TOP PLATE IS REMOVED, CHECK TOP PLATE, CURVED PLATE, FEED RATCHET, FEED PAWL AND TAPE LID SHOE ADJUSTMEN TS.
Page 20 241B MOUNTING SCREWS LEFT SIDE VIEW (A ) WEDGE SPRING REQUIREMENT MIN. 16 OZS. ----MAX. TO START WEDGE MOVING. (B) TOP PLATE REQUIREMENT (1) FEED RATCHET SHOULD ENGAGE AT LEAST 3/4 (2) MAIN BAIL SHOULD MOVE FREELY WITHOUT TOUCHING FEED WHEEL . THE TOP PLATE SHALL BE IN CONTACT WITH THE FRONT PLATE.
Page 21 241B TAPE 0UIDES TO CHECK PLACE A LENGTH OF PERFORATED TAPE I N READER S O THAT IT I S ENGAGED B Y FEED WHEEL AND GUIDED BY TAPE GUIDES. TAPE GUIDE REQUIREMENT 0.010 SOME----MAX. INCH SIDE PLAY OF TAPE IN GUIDES. TO ADJUST WITH MOUNTING SCREWS LOOSENED, MOVE EACH TAPE GUIDE TO OUTER LIMIT OF ITS...
Page 22 241B ® (TOP VIEW) ® F EE D TAPE HOLES FEED WHEEL REQUIREMENT WITH MAIN BAIL IN UPPER POSITION, MIN. OZS. ----MAX. OZS. TO START FEED PAWL MOVING. (B) FEED RATCHET TO CHECK PLACE LENGTH OF FULLY PERFORATED TAPE IN UNIT SO THAT IT IS ENGAGED BY FEED WHEEL, TAPE LID AND TAPE GUIDES.
Page 23: Front View
24 1B DETENT FEED PAWL REQUIREMENT WITH MAIN BAIL IN ITS LOWEST POSITION AS PERMITTED BY DRIVE FEED PAWL ECCENTRIC, CLEARANCE BETWEEN FEED RATCHET AND DETENT: MIN. 0.002 INCH----MAX. 0.005 INCH TO ADJUST WITH TOP PLATE REMOVED AND MOUNTING SCREWS LOOSENED, POSITION FEED PAWL.
Page 25 241B FREE WHEELING LEVER SPRING (A) FREE WHEELING CONTACT TO CHECK (1) REQUIREMENT PLACE FREE WHEELING LEVER UPPER CONTACT SPRING SHCl.JLD TO THE LEFT IN ITS UNCPERATED BE STRAIGHT---- -- -. POSITION. TO ADJUST REQUIREMENT BEND UPPER SPRING. 14 OZS. MIN.
Page 26: Ifront View
TOP PLATE FREE WHEELING ADJUSTING SCREW TO CHECK HOLD FREE WHEELING LEVER FORWARD IN ITS FULLY OPERATED POSITION. FRONT VIEW REQUIREMENT REAR EXTENSIGI OF TAPE OUT ®. LEVER SHOULD BE BELOW TOP SURFACE OF TCP PLATE. ----' 0.0 4 0" MIN .
Page 28: Drive Belt
241B BASE NOTE: THE ADJUSTMENTS ON THIS PAGE APPLY TO SINGLE UNITS (}.IL DRIVE BELT ALIGNM ENT REQUIREMENT WHEN UNIT IS OPERATING, BELT SHOULD BE IN FULL DRIVE BELT ENGAGEMENT WITH BOTH SPROCKETS. TO ADJUST SPROC KET POSITION MOTOR SPROCKET IN ELONGATED HOLE WITH MOUNTING SCREW LOOSENED.
Page 29 2418 NOTE: THE ADJUSTMENTS ON THIS PAGE APPLY TO DQJBLE UNITS ONLY. (A} READER DRIVE BELTS TENSIO N TO CHECK BY MEANS OF A SCALE, APPLY A 4 OZ. PUSH � � � TO CENTER OF BELT SPAN ( SEE FIGURE 3-15). R EQUIREMENT MOTOR BELT SHOULD YIELD...
Page 31 LUPL Apply Luoriplate 105 ( Teletype part No. 108805). EKcept where Lubriplate is called for, Teletype KS-7470 oil and Ks-7471 grease should be used. Over lubrication that might permit oil or grease to drip or be thrown on other parts should be avoided.
Page 32 24fB SENSING, LATCH, FEED AND DRIVE MECHANISMS TEETH FEED RATCHET ENGAGING SURFACES SENSING PINS TOP P LATE. WIPE OFF EXCESS.) PIVOT TAPE LID FEED WHEEL 0 BEARING -RIGHT FEED WHEEL OGO BEARING-LEFT FEED PAWL ENGAGING SURFACE SENSING PIN SLOTS MAIN BAIL PIVOT FEED PAWL SPRINGS...
Page 36 241B BX 3 B X l 6 HOLE 7 HOLE 5 HOLE 8 HOLE -<:r- - - - - - - - -- ---- - - - -- - --- - - - - - - - - ------ -- - - -...
Page 39 241B TAP E L I D TAPE LID SHO E TOP PLATE W H EEL MAIN OPERATING FEED PAWL SPRING WINDING WEDGE DETENT AUXIUARY OR MOTOR START RELAY MA IN BA IL B EARING HO USING MA IN BA IL SPRING HERM CUTOUT...
Page 40 241 8 TAPE LID CONTACT SPRING CONTACT TERMINAL oOO O MAIN BAIL: MARKING CONTACT SPACING CONTACT ECCENTRIC DRIVE FOLLOWER FRONT VIEW TAPE LID SHOE CURVED PLATE FIGURE 2-5 SENSING AND CONTACT MECHANISMS (TOP VIEW) FIGURE TOP PLATE ASSEMBLY 6-9, 6-10 CHANGE 1...
Page 41 2418 FEED BEARING FREE WHEELING BUTTON BX I, B X FREE WHEELING LEVER WHEEL TAPE OUT LEVER TAPE OUT CONTACT �� RING PAWL FEED PAWL FRONT FRAME FRAME MAIN BI'>IL SPRING MAIN BAIL LATCH LEVER SPRING � ARMATURE INTERMEDIATE LEVER...
Page 43 2418 MOTOR UN � � § A.C . (SEE FIGURE 2-2) � MOTOR-ON SWITCH a.. a.. z MOTOR A.C. UNIT (SEE FIGU R E 2-2) FUSE M OTOR-ON SWITCH n.ffi r-----, TAPE STA RT � RELAY NO.2 SWITCH 0::: TAPE OUT CONTACT 5 >...

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