Patent GB-189922148-A (GB)
Title: Improvements in Type-writing Machines.
Inventor: BAUM EDWARD FLORENCE
Filed: 1899-11-06
Granted: 1900-11-03
Abstract: 22,148. Baum, E. F. Nov. 6. Type-writers.-The frame comprises a front plate 2, side rails 3, a rear cross-bar, and inwardly-extending lugs 5 to which is secured the segment 6. The segment 6 is slotted to receive the type-bars 10, the upper ends of which are bent rearwardly as shown in Fig. 1. The type-bars are all pivoted on a wire seated in a groove in the front face of the segment 6 and secured at each end by screws 9. A curved bar 15, lined with felt, forms a cushion for the type-bars on their return from the printing-point. The key levers 17 are provided with notches 20, which together with the wedge-shaped rims on which they rest, constitute the pivots for the levers. The levers are guided by pins 18 and slots 26. The shift-mechanism for the carriage comprises a forwardly-extending bail 29 secured to the carriage and resting on grooved rollers 30. A lever pivoted beneath the key-levers so as to move in a horizontal plane carries a pin adapted to engage the bail 29 and draw the carriage towards the operator against the tension of controlling-springs. The shift key levers 36 actuate the left-hand end of the abovementioned horizontal lever, their downwardlyextending arms passing through a stepped opening in a stop-plate so that the one lever shitts the carriage twice as much as the other. A notched locking-arm is adapted to lock the horizontal lever in either of the shift positions. The platen 51 is journalled in brackets 52, and carries a ratchetwheel 56 with which engages a pivoted pawl 57 on the line-spacing lever 58, Figs. 1 and 10. The lug 59 is adapted to strike against a stop-pin projecting inwardly from the bracket 52, but, when only half the usual space is required between the lines, a stoppin secured to a pivoted arm 62 and passing through a slot in the bracket 52 can be thrown into the path of the lug 59. When it is desired to turn the platen in the reverse direction to the normal linefeed, the milled wheel 64 is turned, and the pawl 57 rides upon a pin 63 projecting from the paper guide or apron 53 and disengages the ratchet-wheel. The paper feed-roll 67 is journalled in brackets secured to the apron 53. In Fig. 1 a sheet of paper p is shown in position on the platen. The paper carriage is provided at the rear with a bar 68, Fig. 14, having oppositely-disposed teeth 69, 69<a> with which engage respectively an adjustable marginstop 81 and an adjustable carriage stop 72, which co-operate with a fixed lug or stop on the machine frame. A pivoted arm 73 actuates the alarm bell by depressing and suddenly releasing the spring arm carrying the hammer. The spring barrel which effects the carriage-feed is provided with a hook engaging with one or other of a number of holes in the end of a strap connected to the carriage, this arrangement enabling the tension on the carriage to be varied. The carriage feed-rack 86, Figs. 1 and 8, is pivoted by its arms 87 to the carriage, and is normally in engagement with a pivoted dog 89. Upon the depression of any key the universal bar 95 is depressed, and the space-bar 94 lifts the rack as shown in Fig. 8. The dog 89 then falls back into the position shown in Fig. 8, so as to allow the carriage to advance one step, when the rack reengages with the dog. Removably fixed to the carriage track 92 is a vertical plate 98, which supports the inking-ribbon spools. On the plate 98 is adapted to move a slide 102, Fig. 7, bearing pivoted pawls 106 engaging with the ratchet-wheels 114 on the ribbon spools. A shifting-bar 109, provided with lugs 108, enables either of the ratchet-wheels to be engaged with its corresponding pawl. The slide 102 is urged downwards by springs, but is raised by the space-bar 94 whenever a key is depressed. The ribbon is guided through a vibrating holder 119, Fig. 4, which is thrown forward by the space-bar when a key is depressed and then returns under the influence of counterbalance weights 124.