IBM B-1, Instruction Manual

Page 1: ...IBM ELECTRI TYPEWRITERS CUS rOMER ENGINEERING B 1...

Page 2: ...L MODEL B1 Issued to ___________________ Branch Office _________________ Department ____________________ Address ___________________ If lost or mislaid finder will kindly return to the above address I...

Page 3: ...Carriage and Rai Is Paper Feed Platens Functiona I Cams Space Bar Shift Tabulation Carriage Return Backspace Ribbon 1958 by INTERNATIONAL BUSINESS MACHINES CORPORATION 590 Madison Avenue New York 22...

Page 4: ...c c...

Page 5: ...otor are that it requires no gover nor or governor contacts and requires only a simple switch cir cuit and a fuse Changing machine specifications from one 1 White llac lc Gray sJitch capacitor Figure...

Page 6: ...spaces to the inch Machine pitch usually is determined by the size of the type used Type style and size also indicate the power roll speed needed for best impression results The speed of the power ro...

Page 7: ...t position The springs are located between the front ends of the key levers and the pring lugs on the top of the front guide comb Fig 15 The travel of each key lever is limited by strips of rubber mou...

Page 8: ...of the knockout bor and pivots in two bronze bearings which are mounted to the left and right side frames Fig 10 A plastic gear is pinned to the left end of the shaft and meshes with the teeth on the...

Page 9: ...the key button by the operator causes the rear end of the key lever to pivot about the fulcrum wire in the key lever bearing support Fig 15 The lug on the bottom of the keylever contacts the top lug...

Page 10: ...wi II remain against the key lever lug unti I the key lever is allowed to restore The restoration of the key lever allows the trip lever spring to restore the trip lever up toward the rear of the mach...

Page 11: ...is allowed by the spring loaded plunger This will cause the front step of the key lever lug to depress the trip lever for a repeat action of the cam If the key lever is he Id down in this position the...

Page 12: ...ps to the right under tension of the pawl spring and immediately contacts the next rack tooth The type bar continues on toward the platen and prints causing the pawl spacer to continue its forward tra...

Page 13: ...rip links have been used on the Model Bl One is the solid link with pin clevis the other uses a clevis contain ing a compression spring The spring clevis was designed to improve impression by equalizi...

Page 14: ...rgin set lever will contact the margin stop and lower it farenough to disengage it from the margin rack With the margin set keybuttoh held down the carriage may be positioned by using the space bar ba...

Page 15: ...ng right margin when the bell rings approximately 10 spaces from the margin When the letter key levers lock at the margin the operator must then decide whether to complete or hyphenate the word being...

Page 16: ...plate has one extra bearing point o n the outer carriage to obtain additional stability for the line space mechan ism Earlier machines used a carriage side frame eccentric nut as a third bearing point...

Page 17: ...se carriage motion to the right Hand carriage release can be used by the operator to move the carriage in either direction To do this the operator depresses the left or right carriage release button a...

Page 18: ...y Paper feed and paper release are the two bosic functions of this mechanism The inner carriage provides the mounting for the paper feed mechanism so that when the inner carriage is cammed front or re...

Page 19: ...its rotation wifh the platen Feed ro II pressure is supplied by applying a twist to flat torsion springs Fig 34 The ends of these springs are mounted in 15 slots in plastic bushings which are molded...

Page 20: ...over printing on the paper The rollers also feedthe pop er away from the operator so the writing line is plain Iy visible Bail Shaft Figure 37 Paper Bail The paper boil has three positions which are a...

Page 21: ...a platen is determined by the style of the type and the particular job it wi II be required to perform 17 A code number and letter are stamped on the right end of the rubber to identify the various gr...

Page 22: ...s fed by the pins and misfeeding results if the feed rolls are engaged A detent spring is installed to hold the feed roll release le er in its re leased position 18 Card Holding Platen The card ho ldi...

Page 23: ...anisms use double lobe cams located on the left side of the machine Fig 40 The carriage return and backspace use single lobe cams located on the right side ofthe machine Fig 41 The double lobe double...

Page 24: ...lution when the key lever is depressed arid completes the revolution when the key lever is restored upward Fig 42 Only the shift mechanism uses this double action type cam Figure 42 Double Lobe Shift...

Page 25: ...me as that employed for repeat non repeat operations on the letter key levers SHIFT The purpose of the shift mechanism is to raise or lower the type basket and permit double case typing Two key button...

Page 26: ...are shoulder riveted to the shift actuating lever This is called the shift pusher lever assembly The actuating lever pivots on a shoulder screw in the power frame and is spring loaded to the rear A s...

Page 27: ...sket mechanism The pin on the back of the buffer is cammed downward by the top of the cutout in the toggle lever plate as the buffer completes its restoration The cutout and the buffer spring position...

Page 28: ...in its operated position over a pin on the rebound check bracket Fig 49 2 The pawl release hook contacts the rear upright lug on the pawl release lever causing the pawl release lever to rotate and re...

Page 29: ...direction to the exist ing main spring for best operation of the governor The improved mechanism includes a4 inch plastic gear 25 Clutch Governor Figure 52 Centrifugal Tab Governor attached to the mai...

Page 30: ...ition The tab stop then strikeS the tab check lever mov ing it to the J ft Fig 54 The tab check lever moves the tab latch to the left unti I it is no longer be hind the keeper At this time the travel...

Page 31: ...eck lever was moved to the rear by a leaf spring and as soon as the tab lever restored to rest another leaf spring returned the rebound check lever to rest CARRIAGE RETURN The carriage return mechanis...

Page 32: ...is now forced against the clutch pulley and causes it to rotate and wind up the carriage return tape One end of this tape is attached to the pulley and the other end to a stud on the index pawl carrie...

Page 33: ...t margin Third the margin control bellcrank contacts the carriage re turn tab interlock and rotates it counter clockwise from the top of the machine The interlock moves the clutch latch linkage and un...

Page 34: ...awl to move forward and engage a platen ratchet tooth The ratchet is ro tated until the index pawl strikes the lower index pawl stop The rotation of the ratchet has caused a ratchet tooth to lower the...

Page 35: ...operated This prevents the rebound check lever from holding on the right side of a set tab stop and locking the car riage when the clutch is pulling the carriage to the right A flat extension on the...

Page 36: ...Figure 66 Backspace Pawl Sequence Of Operation 32 Intarloct Ir Backspace Pawl Clears Rack f r lJ And Stop When Backspace Is Backspace Interlock Operated Operated With Interlock Actuated Figure 67 Bac...

Page 37: ...te about this shaft The motion of the letter cam lever pivots the bai I about the shaft A link attached to the bail transfers the motion to the ribbon Ii ft mechanism This motion rotates the actuating...

Page 38: ...di rection As the feed pawl restores to its rest position the check pawl prevents the ribbon spool from following the feed pawl Ribbon Reverse Reversing the direction of the ribbon feed requires an au...

Page 39: ...chment utilizes the same ribbon lift mechanism as the fabric ribbon except that the ribbon lift guide is designed to lift and feed a 5 16 wide carbon paper ribbon The ribbon feed mechanism uses the sa...

Page 40: ...ol is attached to the inner half by a collapsible spring that hooks behind the inner spool when not compressed On machines above serial number 581357 a noiseless style of carbon ribbon rewind has been...