Patent GB-190401710-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: FELL JOHN CORRY
Filed: 1904-01-22
Granted: 1904-03-03
Abstract: 1710. Fell, J. C., [Monarch Typewriter Co.]. Jan. 22. Type - writers.-Front - strike type - writing machines have their type moved by mechanism in which the chief bearings are specially formed to resist wear, and are protected from dirt; also, each separate type-bar and its mechanism may be easily detached from the machine and replaced, and the type bars are so bent at their ends, as to clear the adjacent type-blocks, and allow of the bars being closer together. Each type-bar 17 is pivoted on a bifurcated hanger 25, having a projecting part 32. These hangers are mounted on a segmental holder 21, in such a position that when the type-bars are vertical, the type 45 strikes the platen roller 4 at about the same height as its axis. The finger-keys are supported on levers 5, pivoted at 6, and carrying levers 8, which turn about pivots 9 on the levers 5, and rest at one end on a bar 11 in a slot 10. Springs 7 keep these levers normally in the position shown, but when a key is depressed, the corresponding lever 8 raises the type-bar 17 through a wire link 13, until the type strikes the platen roller 4. One end of the link 13 is bent through an eye 16 on the type-bar, and secured in place by a leaf spring 18, so that it may be easily disengaged. Several characters are mounted on each type block, which has a slightly tapered pin 46, driven into a socket 47 in the typebar. As the type-blocks must be set at an increasing angle to the bar, depending on their distance from the centre of the segment, the bars are spaced further apart towards the sides to prevent the type-blocks from being too close to each other. The ends of the outer bars have also to be bent to clear the tips 45<a> of the adjacent type-blocks. The type-bar 17 may have a rib on the top, which not only stiffens the bar but prevents dust &c. from the platen from falling on to the bearing in the hanger 25. The type-bar is hardened at the end 23, and preferably bears on a hardened collar driven tightly on to a central rivet 28, which passes through both sides of the bifurcated hanger. The outer end of the rivet hole is slightly chamfered, and notched, and the rivet end is hammered or spun over into the chamfer and notches to prevent it from turning or falling out. The width of the hardened collar is less than that of the type-bar, so that as wear occurs between the sides of the typebar and hanger, it may be taken up by further spinning the rivet end, and so closing in the sides of the hanger. The collar may be omitted and the rivet hardened as far as possible, but the end must be left soft enough to spin over. Each hanger is held firmly in place against the surfaces 37, 38 of the type-bar segment, by a screw 40, which bears on the inclined face 33 of a notch in the extension part 32. By slackening this screw sufficiently far to allow the projection 35 to pass upwards, and disconnecting the link 13, the whole type-bar mechanism may be removed. After making an impression, the type-bar is returned to its normal position of rest on the segmental pad 19 by a spring 43, fixed to the type-bar and to the hanger at opposite ends.