Patent GB-191203390-A (GB)
Title: Combined Typewriter and Computing Machine.
Inventor: FAIRWEATHER WALLACE CRANSTON
Filed: 1912-02-10
Granted: 1913-02-06
Abstract: 3390. Fairweather, W. C., [Underwood, J. T.]. Feb. 10. Adding - apparatus; attachments and connexions to typewriters; column - spacing. - A combined typewriting and computing machine of the type described in Specification 5557/06, in which the numeral keys set up pins in rack-bars and these pins subsequently determine the extent of rotation to be imparted to the computing-wheel, has a number of individual totalizers for computing in several columns and is provided with means for causing any two or more of the totalizers to register simultaneously so as to give the line-total and the grandtotal of the items computed in the different columns. Adjustable selecting-devices or dogs mounted on the typewriter carriage engage in succession a number of denominational selecting- levers which are adapted to set one of the series of pins mounted in the register rack-bars. When computing in columns, it is arranged that the selecting-dog acts only upon its associated groups of levers and clears the other groups. This is effected by varying the lengths of the selecting-levers f<1>, the shorter group being on the right, and the selecting-dog f being offset on its respective block f' to engage the ends of the co-operating group of levers. In cross or line totalling, a number of selecting-clogs equal in number to the number of columns must be actuated simultaneously with each of the column dogs, and to obtain a grand total, a selecting-dog is arranged to come into operation with the co-operating selecting-levers simultaneously with the printing of the line-total, or the result may be obtained by a method similar to that employed for computing the line total. Differential mechanism.-The typewriter is of the Underwood type, and is provided with an automatic speed-governing device to control the movement of the carriage when this is freed from its step-by-step escapement. Depression of a numeral key 5, Fig. 3, through its adjustable stem b, which is adapted to engage an arm b<6>, Fig 14, on a corresponding rock-shaft b<5>, rocks this shaft and thereby, through an arm b<12> thereon, a link b<9> and bell-crank b<10> are operated to depress a bar b<7>. The stems b of the keys, when depressed, engage a pair of cam-plates b<15> and thus prevent more than one key from being depressed at a time. The bars b<7>, Fig. 9, are arranged across the machine and lie directly above the series of pins c<5> of the register rack-bars c, which are mounted at right-angles to the bars b<7> and are adapted to be raised by the denominational selecting- levers so as to cause the bar b<7> that has been depressed to project the corresponding pin on the raised rack-bar into the path of a bar c' on the general operator. The general operator comprises a pair of rack-bars c<7>, Fig. 8, and a pair of transverse bars c<9>, c<10>, the bar c<10> upon return of the carriage being adapted to engage lugs on the rack-bars c and return them to their normal position. The racks and carriage are reciprocated by means of pinions and segmental gears engaging therewith. Selecting denomination. - For each totalizer there is a corresponding selecting-dog f mounted on the typewriter carriage, and a series of denominational selecting-levers f<1> equal in number to the number of rack-bars c together with a number of punctuation space levers g. The dog f is mounted in a block f<7>, which is itself mounted in an adjustable rod f<5> and is provided with a depending tooth engaging a notch in the notched bar f<6> of the carriage along which the block can slide. To render the selecting-dogs inoperative, the blocks f<7> can be raised to a vertical position. The levers f<1> are pivoted to arms on the casing, and their rear ends rest on rods f<15>, Fig. 3, which are adjustably connected at their lower ends to levers f<16>, g<2>, respectively. Figs. 8 and 9. The levers f<16> are pivoted at f<17>, and are increased in length on either side of the pivot from right to left. Extending transversely of the levers f<16> is a number of bars f<23> mounted on bell-cranks f<24> and having depending lugs f<28> and upwardly extending lugs f<29> which respectively engage the forward ends of the levers f<16> and underlie the ends of the rack-bars c. The arrangement is such that the right - hand lever f<16>, Fig. 27, engages the lug f<28> on the rearmost bar f<23>, and the lug f<29> engages the left-hand rack-bar c. Punctuation.-The upward arms of the levers g<2> are pivoted to links g<3> which are connected at their forward ends to a lever g<5> on a rockshaft g<6> provided with a locking-arm g<7> adapted to be forced between the cam stops b'5 so as to prevent a numeral key from being depressed in the punctuation space, the positions of which spaces can be varied by interchanging the connexions of the levers f<16>, g<2> with the links f<15>. Zeroizing-mechanism. - At the left-hand side of each series of rack-bars c is a bar k having a single pin k<1>, Fig. 33, which can be projected into the path of the bar of the general operator when the zeroizing-key k<11> is depressed. The key k<11> first extends the spring k<14>, which is attached to a bar k<4>, and then rocks a locking- lever k<8> to free the lever k<1>, which, under the action of its spring, is rocked to raise the rearmost end thereof to set the pin k<1>. The bar k is moved by the general operator, and the teeth of the bar k mesh with a pinion loosely mounted on the numeral-wheel shaft a<1> and connected thereto by. a one-way friction clutch. The bar k is returned by engagement of the carriage bar c<10> with a lug k<3> on this bar. Error keys &c.-To restore the projected pins c<5> and k<1>, a plate c<47>, Figs. 9 and 14, with a projection k<19> extending below the bars c, k is raised bv means of an arm c<48> on a rock-shaft c<43>, which is rocked by means of a cam-arm thereon engaging a spring-controlled arm c<52> on the left-hand rack-bar c<7> of the operating- carriage when this is nearing the end of its return stroke. The error-correcting key p is similar to the zeroizing-key k<11> and, when depressed, is adapted to raise the rear end of a lever p<3>, which thereby engages an arm of the bell-crank c<44> to raise the plate c<47> to restore the depressed pins. Full-stroke mechanism.-The segmental gear c<15> on the main shaft is recessed to receive a hub c<17>, Fig. 38, having eccentric cam-surfaces c<20> between which and the recess of the gear c<15> are adapted to work rollers c<21>. A reversing- lever c<23> is mounted on the hub and has pins c<26> adapted to engage the rollers c<21> and is provided with screws c<31> which at the limit of the movement of the gear c<15> are engaged by the pins c<30> on this gear to reverse the action of the rollers. On the main spindle is loosely mounted a pinion c<39> which engages a pinion c<41> on an arm c<42>, which can be set relatively to the main handle c<13>. The handle is provided with a pinion c<40>, and when the handle is actuated, the typewriter carriage remains stationary until the pinion c<40> engages with the pinion c<41> and thereby locks the pinion c<39> to the handle which, on the further movement thereof, returns the carriage to the right. Interlocking. - To prevent a key from being depressed when the carriage is operating, a stop t', Figs. 9 and 14, mounted on a sleeve on the shaft g<6> is pressed between the cam stops b<15>; the stop t' is normally held inoperative by means of the carriage bar c<10>. Overthrow of the rackbar c is prevented by means of a stop blade t<3> pivoted to an arm t<4> on the shaft k<5>, which is adapted to be rocked by means of a cam-plate on one of the operating carriage racks. A universal bar t<10> on an arm t" is provided to lock the racks c. k against vertical movement while the set pins thereof are being restored in case of an error in the setting or after the operation has been completed. The bars f<23> are positively returned to their normal position by means of an arm t<22>, Fig. 9, which is adapted tc be rocked by engagement with a notch in the carriage rack c<7>.