Patent GB-190410045-A (GB)
Title: Improvements in or relating to Typewriting Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1904-05-02
Granted: 1904-07-07
Abstract: 10,045. Boult, A. J., [Marriott, H. W.]. May 2. Typewriters.-Relates to machines for printing on books or on sheets laid on a flat surface. Fig. 2 shows a front elevation and Fig. 4 a section on the line a-a, Fig. 2. The printing-mechanism G is movable in two directions over the platen C, and the platen also is movable, so that the line-spacing may be effected either by the movement of the printing - mechanism or of the platen. Two parallel rails A, B are supported, independently of the platen C, on uprights 1, 1<a>, and their upper sides are each formed with two parallel racks 3 having a longitudinal groove or space between them. The main carriage D is suspended on the rails A, B by a pair of pinions 5 and a second pair 6 having central ribs which enter the grooves in the racks and prevent lateral displacement of the carriage. The carriage D consists of a pair of triangular side plates 7, 7<a>, cross-bars 9, 10, and a shaft 12 on which the pinions 6 are fixed. A tilting carriage-frame E, formed of side pieces 13, 13<a> and cross-bars 14, 15, 16, is pivoted at the lowermost part of the hangers 7, 7<a>, by means of pivot screws 19. The bars 14, 15 form tracks on which the printing-carriage F travels transversely for letter-spacing. The frame D with the printing- mechanism is moved for line-spacing by operating a lever 16<a> having a pin engaging a slot in a pawlcarrying lever operating a ratchet-wheel on one end of the shaft 12. Adjustable stops determine the distance of each line-space movement. The line-spacing pawl and detaining pawl may both be moved from engagement with the ratchet-wheel, to permit of the carriage being moved rearwards, by pressing a push-rod. The printing-carriage F consists of a rigid frame having side bars or pieces 38, and cross-bars 40, 43. On the bars 40, 43 are grooved rollers 44, 45 running on the track-bars 14, 15 of the tilting carriage-frame E ; other rollers prevent vertical movement of the carriage. The tilting carriage-frame carries a balance weight 17<a> on arms 18<a>, so that, when tilted with the printing-mechanism to expose the platen &c., it is held in that position. The carriage F is drawn along by a spring-drum 49 and strap 51. On the bar 14 is a rack 53 engaged by spacing- dogs 54 on pivoted arms 56, rocked by an arrangement of linkwork connecting them with the universal bar 62, the connection being such that the dog-arms 56 are not operated when the type-frame G is tilted. The bar 62 is rocked by all the keylevers a and the space-bar 144, 145. The keylevers are pivoted on a triangular type-frame G pivoted by its trunnions 70 upon the side pieces 38 of the carriage F. The type-frame comprises two straight side bars 71, converging towards their lower ends, and connected by arched guide-plates 72, 73 which are slotted to guide the radiallyarranged sliding type-bars c. Plates 74, 76, fixed on the frame 71, are provided with guide-blocks 75, 77 which guide the type-heads to the printing- point. The key-levers a are fulcrumed in slots in the upper edge of the plate 80, and are connected by rods 88 to levers 87 pivoted on a curved bar 85 carried by arms 84 extending rearwards from the bars 71. The levers 87 have pins 89 engaging slots in the type-bars c, and, after operation, the parts are returned to normal raised position by spring-arms projecting from a curved bar 86 on the arms 84. Each type-bar carries a type-head 92 having two types 93, 94 on it, in different planes. The pivoted type-frame G is normally held by a spring in the vertical position shown in Fig. 4, agaiust a stop 96. To bring the second set of types 93 into printing-position, the frame is rocked on its trunnions 70, into engagement with a stop 103, by operating a special key-lever e. The ink-ribbon h is wound on two spools 105, 106 carried by brackets 108 on the side frames 38 of the carriage F. It passes through a tubular guide 118 slotted to permit of the passage of the types to the printing-point. One of the spools is rotated intermittently by a pawl 111, 112 engaging ratchet-wheels 113, 114 respectively. The pawls 111, 112 are pivoted to arms connected with the universal bar and with the type-frame G. A sliding ribbon-shift-bar 116 moves either pawl into, and the other out of, engagement. The ends of the pawls are formed with extensions embracing the sides of the ratchet-wheels, to prevent them from becoming disengaged when the type-frame G is rocked. The guide 118 is attached to bearings 119, 120 by which it is hung on the trunnions 70, and it may be rocked by a key-lever g and arm 122 to expose the line of writing. A pointer 126 on the guide indicates the printing-point. The platen C is guided upon rails 127, and may be moved in a direction parallel with the rails A, B, for line-spacing, by a rack 129 and pinion 130 operated by a ratchet-and-pawl arrangement. The pawl is carried by a lever 135 pivoted on the bed or support 2. A cam 140 pivoted on the lever 135 may be operated to move the pawl in or out of gear. An adjustable stop limits the movement of the lever 135. The platen C is provided on one side and one end with ledges 125 projecting above it to assist in placing the paper, and the paper is secured by suitable clamps 150.