Patent GB-190011414-A (GB)
Title: Improvements in Calculating or Computing Registers specially applicable to Type-writers.
Inventor: JARDINS BENJAMIN MYRRICK DES
Filed: 1900-06-23
Granted: 1901-06-08
Abstract: 11,414. Des Jardins, B. M. June 23. Type-writers and like machines.-Relates to calculating or computing registers specially applicable to typewriters. The register is enclosed in a cylindrical case 1 having a straight - slot or opening 14 and secured to the type-writer frame by a bracket. Six indicator bands or rings 3, representing units, tens, &c. and graduated with large characters for addition and small characters for subtraction, are confined between annular flanges 8. Each ring, except the units ring, has internal teeth 20 to engage pinions 21 on the shaft 22. Each ring, except the last, has an annular flange 23 engaging a recess in the adjacent ring and carrying a double toothed segment 23<a> engaging one of the pinions 21. Alternate teeth on the pinions 21 are wider than the others and the flange 23 rests on two of the wide teeth, when the pinion is elevated, so as to prevent turning of the pinion unless the narrow teeth are engaged by the segment 23<a>. The rings 3, except the first, have ten internal driving-teeth 24 to the left of the teeth 20. A pinionblock 25 and locking-plug 26 may be reciprocated but cannot turn in the casing. The block 25 is chamfered at 29 to receive the pinions 21 and the operating mechanism for the rising and falling carrying blade 30 engaging a slot 31. The pinion shaft 22 is connected by arms 32 to the blade 30 which has slotted lugs 33, engaging an operating-pin 34, and its sides are indented to ensure alignment of the pinions with the teeth 24. Cross-bars 36 have V-shaped ears 37 to align the teeth of the pinions 20 when these are lowered. The pin 34 is carried by a rocker-arm, rigidly connected to a shaft 38, which telescopes in a rockshaft 40 having slots 42 engaged by a pin 41. The locking-plug 26 has an external rib 43 to engage the teeth 24. A shaft 44, secured in place by a disc 46 and having a bearing in the right-hand end of the block 25, carries an annular driver 47 having a tooth 48 to engage any of the teeth 24. A collar 49, fast on the shaft 44, connects the several laterally-moving members together. A rod 50, connected to the head 25, is forced to the left by a spring 51. The shaft 44 telescopes in a shaft 53 to which it is connected by a pin and slots. The shaft 40 carries a rocker arm connected by a rod to the regulation carriage-shift bar of the type-writer, this bar being depressed by the ordinary key and space levers. A horizontal rod, fastened to the paper carriage has notches at intervals corresponding with the graduations on a scale on the type-writer. An angular pivoted arm bears against the head of the rod 50 and a sleeve adjustably connected, by a set-screw, to the notched rod. The sleeve carries a pivoted tripping-lug having steps or shoulders, the lowest of which drops by gravity against the top of a fixed frame except when a cam plate, adjustably connected to a fixed plate by a slot and screw, is encountered. The driver shaft 53 extends through a case 69, Fig. 15, and is driven by a clock-movement consisting of a gear 70, on a stud 71, and a pinion 72 on the shaft 53, and controlled by an escapement operated by the figure-key levers and the carriage-shift bar. A spring-actuated pawl 75 and a ratchet 76 are provided to enable the spring to be wound. The shaft 53 carries a wheel 68, having teeth on both sides, and a splined sleeve 77 carrying a loose stop disc 78 carrying pins 79, 80, and stops 81, 81<a>, 81<b>. A pivoted shifter 82 of bell-crank lever form is attached to the shift bar, its upper end being bifurcated. One bifurcation 82<a> normally engages one of the left-hand teeth of the gear 68, while the other bifurcation 82<b> engages a groove 77<a> in the sleeve 77. An extension from the case 69 lies in the path of the stop-pin 80 and is connected to the disc 78 by a spring which tends to retain the disc in its normal position. Ten rock shafts, in the bottom of the case 69, carry rocker arms, pivotally connected to the figure-key levers 1 by straps, cylinders, and plungers, each shaft being returned to normal position by a spiral spring. These shafts carry other rocker arms adapted to project rods into the path of the stops 81 &c. A cut-out finger, adapted to engage the gear 68, is connected to a rock shaft and is held in engagement by a spring and released by a cut-out key engaging a stop on the frame. In a modification, the operating levers, carrying stops, are pivoted to a shaft under the type-writer key levers. Pins on the shaft engage recesses in the hubs of the levers, the size of each recess governing the extent of movement. An escapement shaft, arranged parallel to the operating shaft, carries a series of radial stop pins and a shaft in line with it, and actuating the adding machine, is operated by a motor and carries a slidably-connected escape wheel having ten teeth on each side and normally locked by a fixed stop. A pin on the escape shaft is normally held by a spring against a fixed stop. The escape wheel is moved, each time a key is depressed, by an elbow lever having a fork, engaging a groove in its hub, and an arm connected to the operating shaft. The adding arrangement may be thrown into action by a shift-lever normally depressed by a spring and carrying an arm engaging a pin on the key-shaft which carries a loose disc connected to it by a spiral spring and having an arm engaging a pin on the shaft and an arm to engage the arm on the shift-lever. Displacement of the escape-shaft while inoperative is prevented by a pin on its end. The driving-wheel is moved longitudinally, so as to engage any one of the carrying wheels, by depressing keys on levers having toes to engage the frame and intercept an arm on the slide which moves the driver. The key-board is carried by levers carrying an arm connected to a rack, engaging a pinion used to wind-up the motor spring, and connected with a sector gear engaging a pinion on a vertical rock shaft. This shaft has an arm with a segmental slot engaged by a pin on a lever pivoted to the main frame and connected by a link with the slide, which carries two pawls acting on a vibrating rack forming an ordinary escapement, such as is used on type-writers. A spring tends to move the slide to the right. The rack is carried by a pivoted frame engaged by an arm on the type-writer key-shaft each time it is operated. The type-writer carriage is located at any desired point for tabulating figures or words by means of a pinion engaging a rack operating a pinion on a shaft carrying ten stepped radial pins to engage similar pins on a shaft having a bevel-wheel engaging a segment carried by a rock shaft carrying a tapered blade engaged by the stems of a series of controlling keys. Each carrying-wheel carries another wheel, engaged by a spring detent, and its carrying-tooth is pressed against a stop by a spring. The slide carries an index. When the spring is fully wound a pin raises the rack out of action, and when the spring is run down the pin operates a rod under the type-writer keys so as to lock them. In a modified form of the carrying-device, a lever pawl is pressed upwards by a spring and carries a loose pawl and the locking-device. The lever is held out of action by a trigger operated by a stud on the carrying-wheel. The pawl crank has a catch in the path of a projection on a rod. Each of the levers is re-set by a projection on the shaft.