Patent GB-191315868-A (GB)
Title: Improvements in or relating to Typewriting Machines.
Inventor: ELLIOTT CRAWFORD
IPC: B41J3/28
Filed: 1913-07-09
Granted: 1914-07-09
Abstract: 15,868. Elliott, C. July 9. Type-lever machines for writing on books.-In book typewriters of the kind in which type-levers with reversible type-heads are arranged for v i s i b l e writing around an opening in the frame of the typecarriage, the visibility is improved by constructing and arranging the action in the manner described below and by providing a vibrator for the inkribbon. Type-carriages. - The frame a which carries the action and the keyboard is mounted to move laterally for letter-spacing on a bar a<1> carried by brackets a<2> formed on slides a<3> which can move on guides a<4> for line-spacing. The frame is mounted on the bar a<1> by means of rollers f <9>, f<10>, Fig. 1. The bar a<1> is rotatable in brackets a<2> to permit the frame a to be turned up into the position shown in Fig. 2 for inspection, the frame being provided with a prop which can engage a projection on the brackets. In the normal position the frame is supported at the front by rollers k<2>, Fig. 2, running on a cross-bar k<3>. Type-lever actions.-The frame a is provided with an annular plate b, Fig. 2, carrying an action of a kind known in ordinary typewriters, consisting of long axles b<2> of equal lengths carrying at the outer ends type-levers and connected at the inner ends by cranks c<1> and links c<2> to key-levers c<3> operated by keys arranged in standard keyboard formation. According to the invention, the axles are disposed on the upper and lower faces of the plate b and to improve the visibility, the type-levers b<4>, Fig. 4, are curved, instead of being straight as is usually the case in book-typewriters, and the type-heads b<5> on the type-levers are arranged in two curved baskets c, Fig. 1, in an upper and a lower series which are associated respectively with the upper and the lower series of axles. The type-beads are pivoted at b<8> to the type-levers and are provided with two types b<6>, b<7>, the type b<6> being normally presented for impression. Case-shift mechanism.-The type-heads b<5> are reversed positively, to cause the presentation of the types b<7>, by means of fingers g<6>, Fig. 4, which are adapted on depression of the shift-keys g<5>, Fig. 1, to be set in the path of lugs g<7> on the type-heads. The fingers g<6> are arranged at two levels, corresponding with the two series of type-heads, and are secured to a frame g which is guided vertically by pins g<3> and is connected to the shift-keys. The frame g is supported resiliently by springs. The type-heads are held in the normal or the reversed positions by springs y<9> which engage lugs k on the type-heads The reversed type-head is restored to the normal position shown by the engagement of the finger g<6> with the interior of the basket c. Ink-ribbon mechanism.-(1) The vibrator d' is mounted for horizontal movement by means of parallel linkage d<6>, Fig. 6, connected by a link d<5> to a lever d<1> suspended at d<2> on a bracket d<3> on the frame a. A slotted arm d on the lever d' engages an arm c<7> of a frame c<5> which is pivoted to the frame a and is provided with a universal bar c<4> engaged by the key-levers. (2) The ink-ribbon passes between spools e<14> provided with manually reversed feeding-mechanism consisting of a rod e" which is provided with pawls e<12> adapted to engage ratchets e‹ on the spool-spindles, the rod being movable endways for reverse by means of a lever e<15>. The rod is mounted in levers e<0> and engages levers e<2> which are pivoted at e<3> and are connected by links e' to rear extensions of the arm c'. Letter-spacing mechanism.-The levers e<2> of the universal bar mechanism are secured to a dog-rocker carrying fast and loose dogs a iapted to engage an escapement-wheel e<8>, Fig. 1, mounted in the frame a and provided with a pinion engaging a rack a<10> on the bar a<1>. A spring-drum f<3> is mounted on a bracket f<4> on the bar a', and is connected to the frame a by a tape f0. The space-bar k<1> is secured to levers which engage the universal bar. Line-spacing mechanism.-The line-spaciug lever a<6>, Fig. 1, and a pawl ax are pivoted on the slide a<3> and are arranged so that on operation (f the lever the pawl engages a rack a<8> on the guides a<4>. The rack serves as an abutment or fulcrum for the lever during the line-spacing movement. The slide a<3> also carries a pivoted detent a<7> which is held released by hand during line-spacing. Automatic line-spacing mechanism may be provided.