Patent GB-122972-A (GB)
IPC: B41J3/37
Abstract: 122,972. Marks, E. C. R., (Corona Typewriter Co.). April 15, 1918. Folding machines.-The printing and shift-key levers can be folded laterally into parallelism with the platen, and means may be provided for drawing forward the platen-carriage when the key levers are folded. In the machine shown, the printing-key levers 1 and the shift-key levers 38, 39 are arranged in two groups which are folded to the right and the left respectively by moving apart two levers 21. The space-key 67 is secured to a telescopic lever arranged between the two groups. The lever consists of an arm 67<a> which is pivoted on a wire 14 and formed with an arm 68 provided with three telescopic sections 67b having pin-andslot connexions. The printing and shift-key levers pass through slotted posts 2 carried by two separate lazy-tongs A, B, the links 15 of the lazytongs being connected by the posts 2 and pivots 16. The end posts 2<a> are guided by slots 20 in the base a, and the end posts 2<b> are connected to the levers 21. The printing-key levers 1 are connected by vertical pivots 3 to action-levers 4, pivoted on the wire 14, and the shift-key levers 38, 39 are connected by vertical pivots 40 to levers 41, 42, Fig. 4, pivoted on brackets 43. The normal position of the key-levers is determined by the engagement of the posts 2a with the ends of the slots and by stop shoulders formed on the outer ends of the links 15. The bed 23 for supporting the platen-carriage 3G is formed with ribs engaging guides 25 on the base a, d of the casing, and the bed is connected by links 27 to the levers 21. On moving apart the levers 21, the lazytongs are collapsed and cause the key-levers to be folded, and the bed 23, with the platen-carriage, to be drawn forward. The base-section d is hinged to the section a and, when the platencarriage is in the forward position, can be turned upwards to form part of the back of the casing. Type-bar actions.-Sliding type-bars 9, Fig. 2, are provided with pins 8 engaging slots 7 in bellcranks 6 which are connected bv the levers 4 to the key-levers 1, described above. The type-bars are formed with stems 11, guided by tubes 12 containing returning-springs. Platen-shift mechanism; shift-key actions.- Two shift-key levers 38, 39, Fig. 4, are arranged at each side of the keyboard and are, as described above, connected by hinges 40 to the levers 41, 42, pivoted on the brackets 43. The rear ends of the levers 41, 42 are provided with folding extensions 44, 46, and 45, Fig. 2, engaging rods 37, 37<a> respectively on the platen-frame. The levers 41 are longer than the levers 42, the shift-key levers 38 thus imparting a greater shift than the levers 39. The extensions 44, 46, and 45 consist of a number of links which are normally rendered rigid by shoulders 47<1>, but can fold when the platen-carriage is drawn forward. In folding or restoring the machine, the platen is first lifted to permit of the extensions 44, 45 swinging to the rear or the front of the rods 37, 37a. Letter-spacing mechanism.-The printing-key levers 1 and the space-key lever engage an arcuate universal bar 49 which is guided by vertical plungers 51. An escapement-anchor 61, pivoted on a cross bar 58 of the universal bar, is formed with a finger 65, Fig. 11, and a hook 64 for engaging a rack 62 on the platen-carriage 36. Normally, the hook rests at the top of the slope of a rack tooth and the finger abuts on the vertical face of a rack tooth, a spring 63 pressing the hook downwards. The platen-carriage is geared to a spring drum 33. Ink-ribbon mechanism.-(i) The universal bar 49 carries pawls 53 for driving ribbon-spools 54. (2) A ribbon-vibrator 57, Fig. 2, is pivoted on the cross bar 58 of the universal bar and is normally held in the vertical position bv a spring 59. When the machine is folded, the vibrator is moved downwards by the rod 37a on the platen-carriage.