Patent GB-190119563-A (GB)
Title: Improvement in Type-writing Machines.
Inventor: PAULSON CHARLES JOHN
Filed: 1901-10-01
Granted: 1901-11-09
Abstract: 19,563. Paulson, C. J. Oct. 1. Type - writers. - Relates to machines in which the type are carried on a wheel or segment, and the impression is made by means of a hammer. Fig. 1 shows the machine in sectional elevation, and Fig. 6 in sectional plan. The key levers 2 are pivoted on a transverse rod 3, and are tensioned upwards by springs 6 surrounding headed pins 7, Fig. 5, which are guided within the slots of a comb 9, Fig. 6. When a key is depressed, the lower end of the corresponding pin 7 is projected into the path of a stop arm 32 on the shaft 26 of the type-segment 29. Situated beneath the key-levers in each half of the keyboard is a diagonal bar 12, which forms the rear member of a bail turning on the fulcrum rod 14. The key levers bear upon the upper edge of a bar 18, which can be depressed relatively to the bar 12, being tensioned upwards by a spring 20 secured to the arm 13. The key levers can thus be depressed a little beyond the point at which the bail 12, 13 is arrested. Vertical arms 22 are carried by the inner arms 13 of the bails, and their upper ends are bent over and slotted, as shown at 23, Figs. 10 and 12, so as to engage the vertical pins 24 which project from the hub portion of a radial arm 25 carried by the shaft 26. The arm 25 carries at its rear end a vertical pin 28, which engages with the segment 29. The segment is thus swung to the left or right according as a key in the right or left hand side of the keyboard is depressed, and the extent of its movement is determined by the position of the projected pin 7, which brings the arm 32 and shaft 26 to rest. The working edges of the head of the arm 32 are faced with raw hide to prevent noise, and the contact-points of the various pins are spread over the elongated head by arranging the pins in a curved line which is not concentric with the shaft 26. The wear is thus distributed over a considerable area. The slots in which the pins 24 engage are so formed that either of the arms 22 may be actuated without causing movement of the other. Moreover, after a key in one half of the keyboard, say the right-hand side, has been depressed, accidental depression of a key in the left half is prevented by the fact that the left-hand pin 24 serves as a stop for the curved surfaces of the slot with which it engages. A universal bar 35, pivoted at 37, extends transversely beneath the rear ends of the key levers, and carries at its centre a rearwardly-projecting arm 38 connected by a spring 39 with the type-hammer 40. When a key lever is depressed, the spring 39 is first extended, and the arm 38 then depresses the trigger or catch 43 and allows the hammer to strike against the back of the paper at the impression point. When the universal bar rises again, the arm 38 forces the hammer back to its normal position by its action on the projecting lug 50. The paper-carriage is tensioned towards the left by a spring barrel in the usual way. The horizontal feed-rack 53 is normally engaged by the pivoted spring-controlled feeding dog 54, which co-operates with a fixed detent dog 55. The vertical slide 56 which carries the dogs is depressed by the action of the universal bar 35 on the rearwardly-projecting lug 57. A spring 60 tensions the slide 56 upwards. Shift-key levers 70, 71 are adapted to actuate a vertical rod 68, from which extends a plate 64 which serves to raise and lower the type-segment for change of case.