Patent GB-189920502-A (GB)
Title: Improvements in and relating to Typewriting Machines.
Inventor: GRANVILLE BERNARD
Filed: 1899-10-12
Granted: 1900-09-01
Abstract: 20,502. Granville, B. Oct. 12. Type - writers.-Relates to improvements in the type - writer described in Specification No. 23,935, A.D. 1896. The type-bars slide radially towards the impression point, being guided by converging guide-plates a, Fig. 3, which constitute a guide - box carried on a cradle frame b pivoted to the machine frame at c. The type-bars 60 are actuated by crank levers e and links f from the key levers d. The guide-box a tends to drop by gravity into its lowest position, which is that required for printing lower-case characters. When, however, the spring q is free to act on the lower arm m extending from the shaft l, the fork rod o pushes .the lever p towards the rear of the machine, and lifts the guide-box into position for printing upper-case characters. The spring q is rendered inoperative by means of a locking-lever i, which is normally in engagement with the arm k. To print a single upper-case character at this time a key g may be depressed, which effects the movement of the lever p through the medium of a link h. On the other hand, if the guide-box is set for upper-case printing, a lower-case character may be printed by depressing a key r which turns the shaft l on its pivots and temporarily overcomes the tension of the spring q. The paper carriage is provided with a bar s having a V-groove into which fit rollers t on an antifriction truck u, Fig. 4, intermediate between the paper carriage and the grooved bar v of the machine frame. The truck also carries vertical rollers x which bear on the rear face of a vertical flange y. A pinion 1 on the truck engages with racks on both the carriage and the machine frame, the movement of the truck being thus definitely related to that of the carriage. A roller 3 supports a rod 5 at the rear of the carriage. The escapement mechanism for the carriage-feed comprises a frame 8, Figs. 3 and 7, pivoted at 9 and connected by the link 10, bell-crank lever 14, and link 15 with the universal bar 16. There are two escapement pawls 6, 7, of which the latter only is shown in Fig. 7, the other being removed to show the plate 63 which separates them. Both pawls are pivoted on the pin 18, and are provided with springs 19 which normally hold the extensions 64 against the pin 17. The pawl 7 is also slotted at 21 so as to slide forward one tooth under the influence of the main carriage spring, which overpowers the oppositelyacting spring 19. The rocking movement of the frame 8 is limited by a stop which can be witbdrawn by means of a release key which acts also on the universal bar 16. The depression of this key removes the stop, and throws over the frame 8 sufficiently to release both pawls from the carriage rack, leaving the carriage free. The carriage bears a stop which at the end of a line comes in contact with an arm 67, Fig. 5, pivoted in ears 68 which are also pivoted in a bracket 69. A spring buffer 28 is placed beyond the arm 67. The movement of the arm 67 throws the lever end 29 into the path of the tail piece 30<a>, Fig. 3, of an arm 30 connected with the universal bar 16, thus locking the keyboard. To print a few letters beyond this automatic limit, an unlocking-key is caused to actuate a horizontally-moving lever 33, Fig. 5, so as to turn the ears 68 on their pivot and throw the arm 29 clear of the tail piece 30<a>. The paper roll 36 is held by spring-controlled arms 37 which can be withdrawn by means of links 40 and bell-crank levers 41. The margin stop 44 is adjustable on a rod 43, being provided with a detent engaging with a toothed bar on the carriage. To examine the last character printed, the guide-box a can be turned about the pivot 49 against the tension of the spring 50. This is effected by a key placed close to the lower-case key, so that both can be pressed simultaneously and the maximum depression of the guide-box produced. Line-spacing is effected by a pawl operating a ratchet-wheel on the platen. An adjustable shield can be caused to vary the effective throw of the pawl. A dividing-comb in the guide-box separates the series of type-bars into groups of three or four, which facilitates their movement. The rod which actuates the automatic line-spacing mechanism described in the Specification quoted above is provided with a stop to relieve the space mechanism of strain.