Patent GB-190207862-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELL JOHN CORRY
Filed: 1902-04-03
Granted: 1902-08-07
Abstract: 7862. Fell, J. C., [Union Typewriter Co.]. April 3. Type-writers.-Relates to denominational tabulating-mechanism for type-writing machines, i.e., tabulating - mechanism which provides for the writing of numbers of different denominations in properly-aligned columns, and is described as applied to the front-strike machine shown in Fig. 1. The character keys 14 are carried by levers 12 pivoted at 13 and connected by sub-levers 10 and links 8 to the type - bars 4, as described in Specification No. 14,894, A.D. 1900. Extending beneath the key levers is a universal bar 19 connected by rods 20 to an arm 21, which extends forwards from the escapement-dog rocker 24. On the shaft of the escapementwheel 27 is a pinion 30, which engages with the carriage - feed rack 31. This rack is carried by arms 32 secured to rock-shafts 33 journalled in bearings 34, as shown in the plan view, Fig. 18. By depressing the finger key 36, the feed-rack can be lifted clear of the pinion 30 so as to free the carriage. Antifriction balls 39 separate the grooved carriage bar 37 from the supporting tracks or guides 40. At the right-hand side of the keyboard are situated a series of denominational keys 45, Fig. 3, secured to levers 42 pivoted at 43. Each denominational key lever is 'provided with a con tact-piece 46 and a tensioning-spring 48, the latter being secured in position by the U-shaped contact-piece, as shown in Fig. 12. The springs bear on a fixed cross-bar 49. The contact-pieces 46 are adapted to depress to varying degress a universal plate 50, Fig. 5, which forms part of a frame 50<a> pivoted at 51. Stop pins or screws 86,of varying heights, limit the downward movements of the denominational key levers. The side bars of the frame 50<a> are connected at their rear ends by a pivot piece 53, from which extends upwards a link 54 which passes through a tube 55, Fig. 1, and is tensioned upwards by a spring 57. To the upper end of the link 54 is secured a suitably-guided rack frame 60, the teeth 61 of which engage with a pinion 77 on a rock-shaft or stop-rod 68, Fig. 18. This stop-rod is therefore turned through varying angles by the depression of the various denominational keys. The stop-rod is serrated on opposite sides to form teeth which receive the adjustable column or tabulating stops 81, from each of which projects forwards an abutment or lug 80. Spring clips contained within the housings of the stops 81 clasp the cylindrical portions of the rod 68. A scale corresponding to the carriage scale is marked on the upper surface of the rod 68, and the serrations are letter-distance apart. The key levers 42 are provided with projections 42<b> of varying depth, the projections being adapted to depress a universal bar 89 and frame 90. One of the side bars of this frame extends rearwards as an arm 91, and to it is pivoted a rod 93 connected to a lever 97, Fig. 5, which carries at its further end a yoke 101 adapted to lift the feed-rack 31 out of engagement with the pinion 30. The depression of a denominational key therefore not only causes a rotation of the rock-shaft 68, but also releases the carriage. Projecting rearwards from the carriage is a bracket 105, Figs. 6, 16, and 18, which terminates in a tubular housing 107, which surrounds the shaft 68 and travels to and fro along it with the movements of the carriage. Stops 108 project inwards from the housing 107, and they are arranged in spiral form at letter-space intervals, as shown in Fig. 6, so that the point at which the carriage is arrested depends upon which stop 108 comes in contact with the lug 80, that is, it depends upon the extent to which the shaft 68 has been rotated. Depression of a denominational key will therefore cause the arrest of the carriage at the proper point for commencing the writing of a number of that denomination. In the normal position of the shaft 68 the lugs 80 project directly forwards, and the space 108<x>, Fig. 16, between the stops 108 enables the carriage to be spaced in either direction without obstruction. In order to prevent rebound of the carriage when the stop 108 strikes against the lug 80, a braking-mechanism of the following character is provided :-A lever 114, Fig. 18, tensioned towards the right by a spring 116, is provided at its rear end with a yoke 113, which straddles the head 72<b> of a screw secured in the end of the shaft 68. The shaft 68 is thus tensioned towards the right, a small amount of clearance 70<a> being left to enable it to move longitudinally. When the stop 108 strikes the lug 80, the shaft 68 is shifted slightly leftwards and the link 118 turns the lever 120, so that its forward end exerts a cam-like braking action on the rear face of the carriage rack 31, and prevents rebound of the carriage. Reference is made to Specifications Nos. 7861 and 7863, A.D. 1902.