Patent GB-190714096-A (GB)
Title: Improvements in or relating to Typewriters.
Inventor: BILLING NOEL PEMBERTON
Filed: 1907-06-18
Granted: 1908-06-18
Abstract: 14,096. Billing, N. P. June 18. Typewriters.-Relates to a typewriter comprising (1) a type disk operated by a single key, (2) a paper carriage and spacing-mechanism, and (3) a ribbon inking-mechanism. (1) Secured on a spindle C within a casing B is a type disk C' and a three-part cam C<2>, which is. engaged by a detent C<3> and serves to govern the printing of the various sets of type characters. Loose upon the spindle C is a pinion D to which is attached a three-toothed ratchet-wheel D' engaged by a detent D<3> on the type disk C<1>. The operating- key E is pivoted at E<1> and passes through a slot F', a gear segment E<2> serving to rotate the pinion D and type disk when the key is depressed. On each side of the slot F<1> are slots F<5>, each having two type characters allotted to it ; those on one side are staggered relatively to those on the other side. Slidable upon the lever E is a member E<5> pressed outwardly by a spring E<6>. The lever E is normally spring-held in its uppermost position, and the type disk is rotatable against the action of a coiled spring C'. The slot F<1> is formed in a plate F, which is movable vertically. upon the casing B when the key E is engaged with a slot F<5> and depressed, and an extension F' of which bears upon a pivoted lever G; this lever is connected to a bell crank lever G<3> having a cam flange G<5>, Fig. 5. Carried by a transversely - disposed spring J<1> is a striker block J which, during the descent of the plate F, is first depressed and then released by the action of the cam G<5> upon the block. Fig. 10 shows a modified striker, the arm P being operated by the cam G<5>. The block J when released moves upwards and causes the impression upon the paper. Depression of the lever E into a particular slot F<5> causes one of the two corresponding types to come opposite the printing point; but by pushing in the key member E<5>, the lever E can then be pressed further down in the slot and the other type comes opposite the printing point. The type disk carries three sets of characters, such as capitals, lower case type, and figures, each set being on one-third of its circumference. Depression of the key E into the bottom of the slot F<1> causes the cam C<2> to be rotated so much as to allow its stop c<1> to move past the detent C<3>. During the successive operations of the key E, the detent C3 rides over that portion of the cam between the stops c', c<2>, and the second set of characters are in printing position. Similarly, a further depression of the key E into the bottom of the slot F<1> causes the third set of characters to be brought into printing position. The change in the opposite direction from one set of characters to another is accomplished by pushing-up the lever E so as to release the detent C<3> from the cam-wheel. The amount of change depends on the position of the member E<5> when the key is raised. An indicator is provided to show which set of characters is in printing position. '(2) The paper passes over a platen L<1> and rolls into openings A<3> in the framework. A rack K upon the platen carriage has a bevelled guide K<1> engaged by rollers K<2>, Fig. 5. The escapement mechanism comprises a pivoted lever H engaged by a stud on the lever G and the forked end of which carries a loose dog H<4>. The fixed dog H<8> is formed on the end of the lever H. Depression of the key E causes the lever H to rock the dog H<4> away from, and the dog H<8> into engagement with, the rack K ; the dog H<4> is then swung backwards by a spring H<6> ready for engagement with the next tooth of the rack. A stop H' limits the movement of the dog H<4>. The lever H may be rocked by band for spacing purposes. The carriage is moved by a pinion K<4> tensioned by a coiled spring in a drum enclosed by a bell K<9>. (3) Fig. 3 shows two inking-ribbons carried by double spools M, which can be displaced along the shafts M<2> so as to bring either ribbon opposite the printing point. Either shaft may be rotated by means of ratchet-wheels M<4> engaged by pawls which are operated by the depression of the plate F, one pawl being out of action according to the direction in which the ribbons are wound.