Patent GB-191322602-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: PAYNE HALBERT EDWIN
IPC: B41J19/18
Filed: 1913-10-07
Granted: 1914-07-09
Abstract: 22,602. Payne, H. E. June 14, [Convention date]. Index type-plate machines; toy machines; hammerimpression arrangements.-Relates to improvements in flexible type-plate machines of the kind described in Specification 22,601/13, and comprises the provision of means for improving the alinement, consisting of a support for the type-plate which is held stationary by a flexible part on the impression hammer during the local flexing of the type-plate for impression, the arrangement compelling the type-plate always to flex about the same centre (1) In the arrangement shown, the rubber typeplate 23 is secured, as by vulcanizing, to a metal plate or support 24 formed with a bead 25 engaging slots 27 in brackets 26, the mounting allowing the plate to slide for character-selection and to tilt backwards and forwards, for impression, between stops formed by the edges of the slots. In the normal position of the type-plate, the writing is visible. The impression hammer 33, secured to a rock-shaft 36 and operated as described below, is provided with a spring 78 adapted to engage the plate 24 and move it against the rear edges of the slots 27.. During the last part of the swing of the hammer, the plate 24 is held against the stops by the spring 78 and the hammer flexes the typeplate locally for impression, as shown in Fig. 5, the selected type passing through a slot 31 in an ink-pad, described below. The flexing always takes place about the same centre, namely the junction of the type-plate with the plate 24. (2) The index setting mechanism comprises an index plate 16 formed with circular apertures 21 arranged over index-marks 17 on an underlying plate 20, the index-marks being arranged in the form of a standard keyboard and with the rows of index-marks staggered from front to rear so that the index, described below, can register with only one index-mark at a time. The index 59 is mounted to slide on a U-piece 58 mounted on a bail 56, which is trunnioned in the ends of the bead 25 on the plate 24. The index is formed with a cup adapted to receive the finger of the operator and to fit in the apertures 21. The index may carry an elastic band 61 for preventing slipping of the finger. The index plate is provided with side plates 19 and a front plate to form a cover for the mechanism, the side plates being pivoted at 35 to brackets 34 to permit the index board to be depressed to operate the impression and spacing mechanism. (3) The impression hammer 33 is slotted at 42 to engage a lever 38 which is pivoted on a bracket 40 and enters a notch 43 in the plate 18 of the index board, so that on depression of the index board, the hammer is operated. A coiled returning spring 37 is arranged on the shaft 36 of the hammer. In a modification, the index board is pivoted at the front, and is provided with a roller which engages the hammer directly. Alining for impression.-The hammer 33 engages during impression a rack 62 on the plate 24, the teeth of the rack being bevelled. Letter-spacing mechanism.-A feed-pawl 45, Fig. 6, co operating with a rack 15 on the carriage 3, is carried by a bar 44 which is mounted to rock in brackets 49, 50 and is formed with an arm 46 arranged under the lever 38. On depression of the index board 16, the pawl is retracted idly, and on releasing the index board, the pawl is operated to space the carriage by means of a spring 52. Overthrow is prevented by means of a stop 54 which engages over the pawl at the end of the feedstroke. The arm 46 is used as a space-bar. The bar 44 is mounted in notches in the brackets 49, 50 and is held therein by the spring 52 and a finger 51. In a modification, the bar 44 is replaced by a rockshaft provided with an arm engaging a tail on the impression hammer. The rock-shaft projects through the front of the index board, and is provided with an arm constituting a space-key. Carriage-releasing arrangements.-The depression of the arm 46 raises the feed-pawl out of engagement with the feed-rack and thus releases the cirriage. Pad inking-arrangements; paper-shields.-One or more pads 29 are secured to a shield 30 formed with a slot 31 to permit impression of the selected type. The shield is mounted by ears 32 on the bead 25 so as to tilt with t'he plate 24, but is prevented from sliding by the brackets 26.