Patent GB-233071-A (GB)
Title: Improvements in or relating to typewriters
IPC: B41J1/32
Filed: 1924-02-14
Abstract: 233,071. Peeters, H. Feb. 14, 1924. Type-wheel actions. - The angular position of the type-wheel is determined by an oscillating element or rocker 18, Fig. 1, secured at the upper end of a vertical shaft 20 carrying a toothed quadrant 21 which engages a pinion 22 on a sleeve 23 containing the spindle 58 of the type-wheel 24. The rocker 18 is pivoted at 19 to an element 15 forming one side of a deformable horizontal frame 15 - - 17, of which the arms 16, 17 are connected together by links 29, 30. The frame is deformed to the right or left about fixed vertical pivots 27, 28, when a side 16 is engaged by one of the stop members 12, 13 projecting upwardly from opposite ends of a bar 9, which forms the upper side of a vertical quadrilateral consisting of bars 7 - - 9 connected together by pivots 26. The side bars 8 are also pivoted on fixed spindles 10 at their lower ends and are normally held on a vertical position by springs 11. The horizontal bar 7 is connected by a slotted link 6 to an intermediate spindle 4 provided with tappets 5, which are engaged by projections 3 on the. cranked keylevers 2 when a key is depressed, causing the vertical quandrilateral to swing and produce rotation of the type-wheel until the rocker 18 meets a central tappet 14 on the upper bar 9, where it is held until a key is released. The correct position of the type-wheel is registered by a finger on the machine frame engaging the teeth of a wheel 44 on the sleeve 23. In the construction shown in Fig. 5, fifteen vertical quadrilaterals are provided, with a common horizontal frame 15 - - 17, the differential movements of the type-wheel being obtained by decreasing the distances between the stops 12, 13, so that the bar 9 adjacent to the keyboard has its stops 12, 13 closest together. The swinging of the typewheel for printing is effected by projections 31, Fig. 1, at the ends of the frame bars 9, striking elements 32 arranged transversely of the quadrilaterals. The elements 32 are supported by arms 33 keyed to rocking spindles 34 which are provided with lateral arms 33 arranged to swing upwardly to raise rods 36 about spindles 37. The rods 36 are connected by links 38, 39 to spindles 41 supporting a rigid frame 40 disposed in the tangent plane common to the quadrant 21 and pinion 22. Collars 43 connect the frame 40 to the sleeve 23 of the type-wheel spindle. The teeth of the quadrant and pinion are so shaped that they remain in engagement while the typewheel swings for impression. Keys and keyboards ; key-actions.-The keys are arranged in groups of three, 1, 1<a>, 1<b>, Figs. 3 and 5, corresponding respectively to the three rows of type around the periphery of the typewheel 24. A group of three keys is arranged on each side of an intermediate spindle 4 in order to obtain rotation of the type-wheel in both directions. The key-levers 2 are secured on concentric spindles 25, 25<a>, 25<b> which can rotate independently, and each spindle carries a projecting finger 3 to engage a corresponding tappet 5 on the intermediate spindle 4 common to its group of keys. Case-shift mechanism.-The concentric spindles 25a, 25<b>, Figs. 3 and 5, carrying the keys 1<a>, 1<b> for capitals and signs respectively, are provided at their inner ends with projections or fingers 50, 51 to coact with tappets 52 projecting from a rocking bar 53, which is connected by rods 54 tn a spindle 55 mounted within suitable bearings. The fingers 50 are in constant engagement with the tappets 52 and depress the bar 53 twice as far as the fingers 51, which engage the tappets during the latter half only of a key stroke. Keyed upon the spindle 55 is an arm 56 engaging one arm of a bell-crank lever 57 pivoted upon a spindle 49, and the other arm of the bell-crank lever is shaped to support the bent lower end of the type-wheel spindle 58. When the bar 53 is depressed by either of the fingers 50, 51, the bellcrank lever is swung and the type-wheel is shifted. The tappets 52 may be disposed level with the ends of the spindles carrying the respective keys, or, as shown in Fig. 3, two groups of keys may act on a common tappet 52. Letter-spacing mechanism.-A rack 103, Fig. 5, along the rear end of the carriage engages a driving-wheel 105 on a vertical spindle 102 which is surrounded by a tensioned helical spring 101. The escapement mechanism 104 may be operated manually by a handle 108 on a rotatable rod 109, or the rod 109 may be rotated automatically by keying upon it an arm 110, Fig. 1, carrying a horizontal rod' 111 which is disposed in the path of the bent ends 31 of the horizontal bars 9 of the oscillating vertical quadrilaterals, so that the rod 111 is inclined outwardly after the bar 32 has been similarly actuated to effect the printing by swinging the type-wheel 24. Specifications 233,072 and 233,073 are referred to. Back-spacing mechanism.-The back-spacing mechanism is oontrolled by a handle 120, Fig. 5, on a lever 106 which is moved by translation in a direction parallel to the movement of the carriage, and is identical with the mechanism described in Specification 233,072. Paper-carriages; paper-feeding arrangements; line - spacing mechanism; platen - impression arrrangements.-The carriage 60, Fig. 5, runs on rollers 61 along the machine bed 62 and the paper is fed between two pairs of rollers 63, 64, and 65, 66. The rollers 63, 65 are provided with pinions 67, 68 engaging a driving wheel 69 operated by hand or by a pawl and ratchet which is actuated by the line-spacing mechanism, as described in Specification 233,072. The paper is fed over a flat portion 71 secured to the carriage by screws at its ends.