Patent GB-237676-A (GB)
Title: Improvements in typewriting machines
IPC: B41J1/32
Filed: 1924-05-20
Abstract: 237,676. Fischer, O., and Naamlooze Vennootschap Machina Maatschappij voor Handel en Industrie. May 20, 1924. Relay type-wheel actions; case-shift mechanism; shift-key actions.-In a power-operated machine of the kind in which a type-cylinder having circumferential rows of types is rotated and axially shifted for type-selection and is rocked for impression, the rows of types are arranged in groups which are selected by manual shift-mechanism, and the rows in a group are selected by means of power-operated shift-mechanism controlled by the character-keys. The typecylinder 53 is secured to a shaft 61 splined to a drum 62 which is mounted by ball-bearings in a drum 63 secured to a rocking plats 148 mounted on trunnions 149. The shaft is provided at the bottom with a socket 612 engaging a ball 591 adjustably mounted on a rod 59 which is trunnioned on a pivoted frame 57. The rocking 148 is connected by a link 151 to the rocking armature 153 of an electromagnet 155 which is energized at each operation of the keys and serves to rock the type-cylinder for impression. The rocking movement is limited by a socket 612 engaging a sliding collar 163 connected by links 161 to the rod 59. Shift-keys 51, 50 for manually raising the type-cylinder to bring the third or fifth rows of types into positson are carried by levers 54 connected by slotted links 56 to the frame 57. When the first, third, or fifth row of types is in position, the type-cylinder is, on operation of the appropriate characterkeys, raised to bring the second, fourth, or sixth row into position by means of a lever 75 having a cam-slot 77 co-operating with one of three pins 80, 79, 78 on the frame 57. The lever 75 has a nose 74 in the path of a link 67 connected to a rooking frame 116 carrying the armature 65 of an electromagnet 64. The movements of the lever 75 are limited by a stop, preferably a spring 82. Each column of types on the type-cylinder is associated with two character-keys which are mounted on adjacent levers 48, 49 having rocking members 89, 90 for engaging arms 87, 88 or. laterally-movable bars 84, 85 respectively, the bar 84 being connected by a link 71 to the link 67. The bars 84, 85 have arms 91, 92, F:g. 2, engaging a roller 93 on a lever 94 carrying a contact 941 for closing the circuit of the alectromagnet 64. To delay action of the electromagnet 155, it is arranged in shunt with the electromagnet 64 and is provided with a separate circuit-closing device consisting of a contact 157 carried by an arm 156 on the rocking frame 116. On depressing any of the key-levers 49, the link 67 is depressed idly, whilst on depressing any of the key-levers 48, the link is drawn forward by the bar 84 and depressed, so that the link .67 rocks the lever 75 and thereby causes the typecylinder to be shifted through a distance equal to that between two rows of types. The mechanism for rotating the type-cylinder comprises a sector 98 which engages a pinion 97 on the drum 62 .and is pivoted at 982 on the rocking plate 148, a forked arm 99 on the sector engaging a pin 100 on an arm 101 secured to a rock-shaft 102. The rear end of the arm 101 is forked to engage a roller 103 on a longitudinally-movable bar 105 carried by links 106. Fig. 3, and guided by rollers. Behind the bar 105 are two longitudinally-movable bars 134, 135 supported at the outer ends by links 132, 133 and at the inner ends by bellcranks 130, 131 respectively. A three-armed lever 123, pivoted at 124 to a yoke 122 trunnioned on the rocking frame 116, is forked to engage a roller 128 on the bar 105, and is provided with rollers 125, 126 engaging the bellcranks 130, 131 respectively. The bars 105, 134, 135 have notches 105<1>, 134<1>, 135<1> co-operating with stop-levers 112 which are pivoted on a bracket 113 and guided by a comb 1121. Each lever 112 is associated with one pair of keylevers 48, 49 and is provided with a cross-pin 115 engaging the rocking members 89, 90 carried by the pair of key-levers. On depressing any of the key-levers, the associated stop-lever 112 enters a notch in the bar 105 and a notch in the bar 134 or 135. The lever 124 then descends and rocks the bell-cranks 130, 131, the movement continuing until the bar 134 or 135 is arrested by the stop-lever. Thereupon, the bellcrank 130 or 131 is rocked and moves the bar 105 to the left or right, the movement being transmitted to the type-cylinder and being determined by the widith of the notch 105<1> that engages the operative stop-lever 112. To permit uniform movement of the rocking frame 116, the notches 105<1> 134, 135<1> are of such width that the sum of the movements of the rack 105 and the rack 134 or 135 is constant. When the circuit of the electromagnet 64 is broken, springs 136, 137 return the belt-cranks 130, 131 and associated parts to the normal posiiton, determined by stops, preferably springs 140, 141. In the normal position, a lug on the lever 123 enters a notch in a bracket 1291 supporting the bellcranks. When the type-cylinder approaches the printing point a rocking bail 171, Fig. 1, connected to the rocking plate 148 engages a finger 172 on the rocking member 89 or 90 and releases it from the arm 87 or 88 and the stoplever 112, the arm and stop-lever then returning to normal position and the circuits of the electromagnets being opened. For regulating the impression, the rocking pLate 148 is formed with an arm 175 adapted to strike a spring 174 secured to the framework and adjustable bv means of a screw 173 provided with a knob and a pointer which is set by the aid of a graduated disc 177. The spring 174 may be lined with felt &c. Letter-spacing mechanism; space-key actions. -The paper-carriage 200, Fig. 1, is controlled for letter-spacing by means of the escapement described in Specification 234,763 and comprising a rocking frame 221 carrying fast and loose racks 219,218 co-operating with a dog connected to the paper-carriage. At each operation of the electromagnet 64, the rocking frame is depressed by means of a link 226 connected to a rocking bail 229. Fig. 2, having a cross-bar 231 arranged under the rocking frame 116 carrying the armature 65. The space-keys 47 actuate levers connected to links 238. Fig. 2, having heads 239 resting on ears on the rocking bail 229.