Patent GB-199811-A (GB)
Title: Improvements in typewriting machines
IPC: B41J1/04
Filed: 1922-03-29
Abstract: 199,811. Hess, E. B., and Royal Typewriter Co., Inc. March 29, 1922. Type-lever machines; portable machines. - A compact visible - writing machine comprises a support for the paper-carriage and escapement mechanism mounted and shifted in an inclined plane, and framework consisting of a single sheet of metal bent to form a front, sides, and a back, the meeting edges being joined at the back by a plate. In the light portable machine shown in Figs. 3 and 5, the mechanism is supported in a frame body A consisting of a metal blank bent to form a back, front, and sides, the meeting edges, at the back of the frame being riveted to a connecting- plate A<1> which supports part of the letter-spacing and other mechanisms. The body is formed with top and bottom flanges a<2> and is provided with corner-pieces. Horizontal type-levers U are pivoted in a slotted segment B secured in an inclined position, the type-levers fanning outwards and resting on a cushioned support C<1>. Horizontal key-levers E pivoted on a rod e are connected by links g<2> to levers G which are pivoted on a rod g<1> and are connected by links g to the heels of the type-levers. The pivotal connections between the levers G and the links g<2> are arranged at graded distances from the rod g<1>. The printing-point is higher than the centre of the platen K. The key-levers and levers G are guided by a double comb H. To exclude dust, the body is provided with top plates A<2> between which is a curved member A<3> having a plate a<11> covering the type-heads and the levers G. The ink-ribbon spools R are mounted above the plates Paper-carriages; carriage-shift mechanism; shift-key actions.-The paper-carriage L is supported at the front on an inclined shift-rail L<1>, and at the rear by means of a. roller m<3> and a pin m<4> which are mounted in a bracket N on the shift rail and engage a rod M on the papercarriage. The bracket is arranged at the middle of tho shift rail, and supports escapement mechanism. The shift rail and a rail l on the paper-carriage are channelled to receive balls, and are prevented from separating by means of angle-plates m<2> secured by screws m<10> passing through enlarged holes. To prevent sagging of the paper-carriage, the bracket N is formed with an arm N<2>, Fig. 5, engaging an abutment, preferably a screw N<3>, on the body A. The shift rail is constrained to shift in an inclined plane by means of pairs of rocking-arms l<2>, L<2> pivotally connected to the body A and inclined legs l<1> on the shift rail, To permit adjustment of the plates with reference to the printing line, the pivots l<6> of the rocking arms l<2> are adjustable in inclined slots l<8> in the body. A bell-crank o<5> provided with a shift key O is connected by a link o<1> to one of the arms L<2>, the bell-crank being provided with a pin o‹ having lost-motion engagement with a hook o<4> on the link. The bell-crank is also connected by a link p<3> to a latch P having a finger p<1> which normally engages a lug on one of the legs l<1> and retains the shift rail in the lower position. The latch is of a. bell-crank form, the rear arm being connected to the link p<3> and a returning spring p<2>. On depressing the shift key, the latch is rocked quickly to release the shift rail, and when the lost motion at the pin o<6> has been taken up, the shift rail is raised. The bell-crank o<5> is formed with a lug o<10> passing through guideslots o<11>. One of the arms L<2> is connected to a counterbalancing-spring m<1>. In the lower position of the shift rail, inclined stop-screws n<2>, n<4> mounted in brackets w, q<4> on the body A engage the shift rail, and a stop-screw mounted in a lug r on the bracket N rests on the upper flange of the body. The shift movement is .limited by the engagement of inclined stop-screws n<3>, n<5> on the brackets w, q<4> with cars n<6> on the legs l<1>. The bracket q<1> supports also parts of the ink-ribbon, letter-spacing and other mechanisms. Letter-spacing mechanism; space-key actions. -A universal bail F is operated by rearward extensions E<1> of the key-levers E, the extensions being arranged at graded inclinations to compensate for the difference in the length of the keylevers. The space-bar levers d<10>, Fig. 3, also are provided with extensions for operating the universal bar. A dog rocker T pivoted in the bracket N is provided with a spring arm t<10> bearing a roller t' which engages a lever T<2> connected by a link f<4> to an arm f on the universal bail. The lever T is pivoted to an arm t<6> on the plate A'.