Patent GB-189810644-A (GB)
Title: Improvements in Type-writing Machines.
Inventor: BARNES JOHN EDWARD LLOYD
Filed: 1898-05-10
Granted: 1898-07-30
Abstract: 10,644. Barnes, J. E. L., [Cahill, T.]. May 10. Type-writers.-Relates more particularly to machines adapted to print two letters at a time by means of two sets of type-bars. Fig. 1 shows a transverse sectional elevation of the preferred form of machine embodying the invention. There are two sets of keys, one. set for operation by each hand, and each set consists of three thumb keys B', B<2>, B<3>, finger keys C<1>, C<2>, C<3>, C<4>, C<5>, C<6>, C<7>, and a space key G. The right-hand set of keys is arranged to operate the left-hand set of type-bars a striking the platen m at the point A, and the left-hand set operates the set of type-bars a<1> striking at the point A<1>. The type-bars are connected by wires h to levers f pivoted radially upon a circular part 40 of the framing. Pivoted on a vertical axle K<24> are two segmental pin carriers K, one for each set of type-bars, in which are mounted vertically-movable pins k<9> movable under and adapted, when lifted, to operate the levers f. Each pin k<9> operates four typebar levers f, and the one operated depends upon the position of the pin carrier K. Each pin k<9>, as the carrier is oscillated, moves over the segmental end of a lever e<7>. When any of the finger or C group keys only are depressed, the carrier K remains stationary and the pins k<9> operate the levers f under which they normally stand. The pin carrier is moved into a different position by each of the thumb or B group keys. These keys, at their rear ends, are provided with pins engaging and operating a lever connected to the pin carrier K, and they also operate stops for stopping the carrier in correct position. There are eight levers e<7>, one operated by each finger or C group key and the other one operated when a thumb key only is used. The latter lever e<7> has a pivoted depending arm E which normally stands over the lever frame E<12> pivoted at E<15> and operated by a motor magnet E'‹ when any key is depressed. When any finger or C group key is depressed the arm E is moved out of position over the motor frame E<12>, and the arm E<7> of the lever e<7> corresponding to the operated key is moved into position over the frame E<12> and operated thereby. The arms E<7> are connected by rods 50 to levers F<1> ..... F<7> pivoted at 49, and operated by pins 49<b> of the C group keys C' &c. The electric circuits through the motor magnets E<10> and space magnets are preferably so arranged that the circuit for the left-hand keys is slower in acting, so that the second type-bar a<1> strikes slightly later than the first type-bar a. The escapement is so arranged that normally the carriage is moved so that a space for two letters is provided for, two characters being printed simultaneously, or, in the case of a word having an uneven number of characters, the space at the end of the word is made when the last character is printed. In the case of a word containing an even number of characters, a space key G is depressed simultaneously with the keys for the two final characters, and this operation of the space key closes a circuit containing a magnet which moves the stop normally limiting the movement of the movable escapement dog, thereby permitting it to move on to another stop, and increasing the space to a threecharacter one. This provides for the space at the end of the word at the same time that the last two characters of the word are printed. A circuit-breaking lever is provided by which the circuit is broken immediately after the impression, whether the key is released or not. The electric circuits and spacing-mechanism &c. are fully described in the Specification and drawings. A modified arrangement of machine is described in which the levers corresponding to the levers f, which operate the type-bars, are pivoted at one end in groups on the levers corresponding to the levers e<7> operated by the finger or C group keys. On each of the type-bar levers f is a pin projecting so as to engage one of four lever frames which are operated by four magnets so as to remain rigid and act as fulcrums for the levers f. Of the magnets operating these lever frames, one is energized when a finger key only is depressed, and one of the remaining three is energized when a thumb key is depressed. The machines are fully described in the Specification and drawings, and various modifications are indicated.