Patent GB-190017824-A (GB)
Title: Improvements in or relating to Typewriters.
Inventor: BOULT ALFRED JULIUS
Filed: 1900-10-08
Granted: 1900-12-22
Abstract: 17,824. Boult, A. J., [Spiro, C.]. Oct. 8. Type-writers.-Relates to improvements in the tabulating- devices, margin stops, carriage-feed escapements, and inking-ribbon guides of typewriters. Fig. 1 is a plan view showing the tabulating-devices, and Fig. 3 a sectional elevation. The carriage B is provided with a rearwardly-extending paper-rest C, to which are secured blocks D, which support a rod D' and a toothed rack D<4>. Adjustable spacing-stops D' pivoted on the rod D<2> are provided with detents which engage the rack D<4>. A bar D<5> is movably secured to the rack D' by screws passing through inclined slots in the bar, so that a longitudinal movement of the bar causes it to move rearward and engage its edge with recesses in the stops D<3>, which are thus locked in the positions to which they have been adjusted. The stops serve to determine the positions of columns when writing tables of figures &c., and a scale D<10>, also carried by the blocks D, facilitates their adjustment. In a modification the stops D<3> are rocked to disengage them from the rack D<4> by means of the scale-bar, which is in this case pivoted or adapted to slide, and is provided with a handle or thumb-piece. Pivoted to the frame of the machine is a rack-bar E<5> bearing the two margin stops F, G. The rack-bar also bears a finger E<8> adapted to be thrown into the path of the stops D<3>. When it is desired to use the stops for writing in tabular form, the switch E is first thrown over, so as to bring the arm E<1> above the escapement-pawl lever E<3>. On depressing the margin release-key, the escapement pawls are disengaged from the carriage rack and at the same time the rack-bar E<5> is rocked and the finger E<8> moved into the path of the stops D<3>. The released carriage advances until the next succeeding stop D<3> engages with the finger E<8>, and the writing is then proceeded with in the new column. The margin-stop F for the left-hand side of the paper is stamped from one piece of metal. It is provided with a spring-controlled latch or detent which can be disengaged from the rack by means of a handle F<6>. The other margin stop G is adapted to rock on the rack-bar, a spring G<2> serving to retain it in position thereon. When the carriage comes into engagement with the projection G', the rack-bar commences to move longitudinally with the carriage, and the keyboard is locked. A few more characters can be printed by pressing back the projection G<1> so as to allow the carriage to pass. The escapement pawls H<4>, H<5> are each provided with five teeth instead of one. The body of the movable pawl H<5> is slotted, and slides on a guiding-pin H<6> under control of a spring H<8>. Fig. 8 shows in side elevation the reciprocating inking-ribbon guide or holder. The holder J is not rigidly secured to the universal bail K, but is pivoted at L, and is held in place by the curved ends of a locking-lever M, shown in perspective view in Fig. 9. When preparing stencil sheets &c., the inking-ribbon is thrown out of use by turning the lever M on its pivot M<1>, so as to release the holder J, which then ceases to reciprocite with the bail K.