Patent GB-750454-A (GB)
Title: Improvements in or relating to tape controlled typewriter
Inventor: BLODGETT EDWIN ORSON
IPC: B41J19/58
Filed: 1953-12-16
Abstract: 750,454. Typewriters. COMMERCIAL CONTROLS CORPORATION. Dec. 16, 1953, No. 35027/53. Class 100 (4). [Also in Group VIII] Printing and/or perforating type-lever machines.-A type-writing machine comprises several operative units, viz., a power frame 12, a code selector 13, a tape perforator 15, a tape reader 16 and a code translator 14 each substantially self contained but assembled in a common frame so that the machine may (a) print type-written characters and simultaneously perforate a record tape with corresponding data, (b) perforate a record tape only and (c) print only, either under direct control of the keyboard direct or under control of the record tape. The several operative units 12-16 are all driven from a single power shaft 19, and power from the shaft 19, Fig. 2, is connected by a chain drive 20 to a continuous power roll 21 which through a conventional cam arrangement, Fig. 3, operates the type-levers 36 and other actions. The operation of a particular cam also effects the setting of a slide 261 or 282 in the code selector 13 comprising a series of bails 274 which selectively close electrical contacts to energize six electromagnets PM in the tape-perforator 15 shown in Fig. 35. Perforating unit.-The tape-perforator comprises a punch controlled by the keyboard and code selector 13 for making a control tape feed perforation and six punches for making the perforation code. These punches, one of which, CP1, is shown in Fig. 35, are operated by levers 322 from power-driven cams on a shaft 315 connected through a one-revolution helical spring clutch to the power-shaft 19. Normally, a rotation of a cam moves the left-hand end of levers 322 with no movement of the end connected to the punches, but when an electromagnet PM operates its armature, a latch 342 is released anchoring left-hand end of lever 322 so the action of a cam operates the punches. A locking-bail 360 is moved by a cam to engage below extensions 362 of the latches 342 not released and above those which are released, both operated and unoperated punches being locked. The tape after punching is fed by a ratchet mechanism and held against a feedwheel 331 by a plate 385 carried on a lever 386 so that it may be removed for inserting a tape and for operating a punch control contact PCC. This contact may also be operated should the supply of tape fail by means of mechanism 396, 405. Strip controlled typing.-When the machine is being used to control typing the tape reader 16, Fig. 40, selects the appropriate translator magnets TM, Fig. 45, which effect type or other actions. The reader comprises six sensing pins 439 attached to interposed arms (Fig. 41, not shown) each having shoulders 438 which lie in the path of contact levers 419 which when moved operate a link 420 and close a pair of contacts 412 which operate the appropriate translator magnets TM. The shoulders 438, however, are not moved from the path of the levers 419 until a bail 431 is rocked clockwise on a shaft 429 by the following of a roller 433 with a cam 434. A latch 435 prevents this movement until a magnet RM is energized each cycle of operation. Code translator.-The operation of the various translator magnets TM effects the release of one to six permutation bars PB1-PB6, Figs. 3 and 45, each of which is differentially notched so that with any particular code one seeker 489 may pivot and engage an appropriate key 40. Actuation of the seeker 489 and the key is effected by one operating bail 530 driven from a clutch driven shaft 492. The key operates the appropriate cam mechanisms and a type or other action takes place. Actions, adjustable impact.-The printing impact is adjustable by means of a turnbuckle 43, 44, Fig. 3, which adjusts the setting of the cams 31 relative to the power roll 21. Anti-rebound.-The type-levers 36 are operated through a toggle linkage 46, 45 and when the levers 36 come back to rest position the toggle pivots 47, 48, 49 are in a straight line and effect a locking against rebound. Case-shift.-A type lever basket 52 is moved rapidly to upper case printing position by a key UC1, Fig. 4, which presses a cam 31 against the power roll 21 and is moved into lower case position by depression of a further key LC1 (not shown) with its own cam mechanism. Two oppositely arranged toggle mechanisms consisting of levers 56, 58, 59, 69 adjustably hold the basket in either shift position, and power from the cams moves the basket by breaking its associated toggle. The movement of the basket may be accurately limited by adjusting nuts 76. Letter-spacing arrangements.-A differential letter-spacing is produced by three interconnected escapement mechanisms comprising wheels 130-132 (Fig. 14, not shown) controlled by three pawl rockers, e.g. rocker 195 (Fig. 16, not shown) having movable and fixed pawls, to provide one-to-six units of letter-spacing. The selection of the appropriate combination of movement of the escapement wheels is effected by three electromagnets under the control of electric contacts operated by bails 286, Fig. 3, rocked by cam surfaces in an upper slot in the slides 261, 262 of the code selector 13. Separate contacts for upper and lower case assure operation of the appropriate electromagnets for correct letter-spacing in both cases. Carriage return.-The carriage is returned by power through a clutch engaged by the straightening of a toggle linkage (Fig. 22, not shown) by a carriage return cam controlled by a key-lever. At the end of the carriage return movement a margin stop moves a lever 189, Fig. 19, which operates a cam which engages the power roller and furnishes power for disengaging the clutch by breaking the toggle linkage. Carriage rebound.-A lever 810, Fig. 19, with a hooked end 815 which engages behind a tabulator stop prevents rebound. Sound deadening during carriage-return.-A pawl 162, Fig. 19, adjustably secured to a rear carriage rail 129 prevents reverse rotation of the ratchet-wheel 149, does not click hard against the escapement wheel during carriagereturn but against a leather buffer 166. Carriage-release.-Carriage-release is effected by either of two release levers, one at each side of the machine which rocks a bail 171 (Fig. 13, not shown) to pivot a lever 173, Fig. 19, mounted on the top surface of the rear rail 129. Operation of the lever 173 pivots a lever 175, moves a dog 177, and moves a ratchet 148 counter-clockwise relative to the ratchet 149. Through the coaction of a pin 155 (Fig. 17, not shown), one ratchet 148 engages a lever 153 (not shown) which through pin 152 and pawl 150, disconnects the escapement mechanism from a ratchet 137 so that the carriage may be released or moved by hand or by power to return the carriage. Tabulating.-When a tabulating key is depressed a single-lobe cam pivots a bell-crank lever 239, Fig. 19. This, through link 237, depresses the right-hand end of the lever 225 and an arm 192, by means of a link 193 and the lever 173, frees the carriage from the escapement mechanism as described under carriage release. At the same time a lever 222 is rocked clockwise to elevate a lug 223 into the path of the nearest tabulator stop to the left of the lug 223. A resilient connection 232-234 prevents damage if the lug 223 should strike the lower edge of a tabulator stop. After the lever 225 is operated it is held by a latch 244, and subsequently unlatched by the engagement of the lug with the stop which effects an unlatching of the lever 225 by a power action from the power roller. Line-spacing.-Line-spacing is automatically effected upon carriage-return and if further additional line-spacing is required the carriage return clutch is again engaged and the draw tape rotates sufficiently to effect line-spacing, but the clutch toggle linkage is immediately broken to release the clutch due to the margin stop controlling a mechanism in the carriage return position. Keyboard lock.-A normally energized magnetic lock 28, Fig. 2, rocking a bail, prevents key operation if power is off, and if the machine is set for tape punching the keys cannot be operated unless the tape is properly inserted. Ink-ribbon mechanism.-The ink-ribbon is shifted from one field of colour to another by a colour shift key operating a cam which engages the power roller and operates a ribbon shift mechanism. The colour shift key may be operated under control of the record tape and the ribbon shift mechanism may be moved by hand.