Patent GB-190208111-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELL JOHN CORRY
Filed: 1902-04-07
Granted: 1902-07-31
Abstract: 8111. Fell, J. C., [Felbel, J.]. April 7. Type-writers.-Relates to improvements in frontstrike machines of the type described in Specification No. 14,894, A.D. 1900. The type-bars 4 are pivoted on a segmental wire 6 and normally rest on the curved pad 5. They are connected by links 8 to the sub-levers 9, which are pivoted at 10 to the key levers 11, and are slotted at 13 to engage a fixed transverse rod 14. The platen 16 is mounted on a shaft 17 journalled in the forward ends of side arms 18 extending from the slide 20, which is grooved to receive the antifriction balls 25. Rails 23, 24, also grooved, support the carriage. The carriage feed-rack 29 is carried by rocker arms 53. from the rock-shafts of which extend forwards finger-pieces, which serve to release the carriage when depressed. The rack 29 normally meshes with a pinion (not shown) on the shaft of the escapement wheel, with which the dogs 31, 32 engage. The dog rocker 33 is actuated by means of a link 36 and universal bar 37. Fig. 7 shows the carriage slide 20 between the rails 23, 24. The slide is partly broken away to expose two of the balls 25. The balls are confined in perforations 38 in spacers 39, 40. The spacers are connected by arms 41 bent to follow the contour of the slide 20. The main portion 42 of the upper spacer is bent upwards into the vertical plane just in front of the rail 24, and is formed with rack teeth 44 which mesh with a pinion 45 journalled on a shoulder screw 46 tapped into the carriage slide 20. To the pinion 45 is secured a second pinion 47 of twice the diameter, and this pinion meshes with a rack 48 secured to the rail 24. The spacer bars 39, 40 are thus caused to move with the carriage at half its speed, that is, at the natural travelling speed of the balls. Journalled above the upper carriage rail 24 is a rocker bar 65, Fig. 4, bearing adjustable margin gauges 66. A bellcrank lever 68, 69 is pivoted at 67 to the carriage slide 20, and when its upper end strikes against the stop 66 the horizontal portion 69 depresses a bail 70 pivoted at 71 to the rail 23 and rocks the hooked arm 76 so as to lock the arm 78, Figs. 1 and 4, of the dog rocker and prevent further operation of the keys. This locking-apparatus is described in Specification No. 15,643, A.D. 1900, the rocker bar 65 being provided with milled finger-wheels 79 which can be rotated against the tension of springs 93 to remove the stop 66 from contact with the lever 68 and allow the carriage to proceed. Means are also provided for operating the gauge-bar from the keyboard. For this purpose, an arm is extended rearwards from the bar 65 and has a pin- and-slot connection with a link 82, Fig. 1, connected to a lever 83 pivoted at 85 to the side wall of the machine frame. The lever of the margin-release key 88 depresses the lever 83 by means of a pin 89, and thus effects the unlocking of the keyboard. The paper is guided round the platen by a deflector 94 mounted by ears upon a rock-shaft 96 journalled in the side arms of the paper carriage. The deflector is spring-pressed against the platen in the usual manner. Openings 97, 105 are formed in the deflector for the pressure rollers 98, 106, Fig. 2, carried by spring-pressed arms 100, 108. The front paper guides are mounted upon a rod 112 and comprise downwardly-curving arms 113. to which are pivoted fingers 114, which are pressed against the platen by springs coiled about the rod 112. The guides are adjustable along the rod, the free ends of the tensioning-springs bearing against a feather 117 on the rod. Rearwardly-projecting gauges 118 are hung on the rod 112 by means of ears 120. The gauges incline inwards from top to bottom, so as to facilitate the introduction of the paper. A small roller 121 bears upon the platen at its centre, being carried by a rod 122 detachably secured at one side of the carriage and having sufficient spring to enable the roller 121 to yield when necessary. The roller 121 serves to hold a stiff card or envelope against the platen near the impression-point. The paper shelf is pivotally mounted by screws 126, so that it can be thrown forwards to expose the margin gauge-bar. The platen scale 132 is carried by arms 133 pivoted to the arms 134 and tensioned upwards by springs 136.