Patent GB-482617-A (GB)
Title: A machine for composing lithographic prints
IPC: B41J19/64
Filed: 1936-12-02
Abstract: 482,617. Typewriters. GEIRNAERT, R. L. R. R. Dec. 2, 1936, No. 33022. Convention date, Dec. 3, 1935. [Class 100 (iv)] Letter-spacing mechanism.-In justified letterspacing mechanism for a typewriter employed in typing matter suitable for lithographic reproduction, the quotient of the line-deficit and number of word-spaces is determined by the aid of expansible members which are assembled during preliminary typing of the line and, after being expanded, determine the word-spacing movement of the paper-carriage during typing of the justified line. In the apparatus shown in Fig. 2, the paper-carriage is controlled for differential letter-spacing by the escapement described in Specification 482,616 and comprising a gripper mounted on a laterally-movable slide 32 in connection with a universal frame 2 operated by the key-levers. The word-space required to justify a line is determined by the aid of expansible justifying-members each consisting of a pair of blades 183, 183<1>, Figs. 7, 8 and 11, having engaging inclined faces, each justifying-member being, before expansion, of the same thickness as the normal word-space. Each blade 183<1> is provided at the rear with a stop-lug 236 for engaging a rod 219, referred to below. The justifying-members are stored in a magazine 184 having grooves receiving ears on the blades. Each line is preliminarily typed without word-spaces, and at each word-space, a lever 213 is depressed to transfer one of the justifying-members to a magazine 196 provided with upper and lower grooved jaws which can be moved towards each other by depressing a lever 197. The lever 213 displaces a link 210 in connection with a laterallymovable plate 201 supporting pivoted fingers 198, 199 for transferring the justifying-members. For causing the fingers to move into and out of engagement with the first justifying-member, extensions of the fingers are provided with sliding pins 205 co-operating on the out-stroke and in-stroke of the fingers with cams 207, 209 and 206, 208 respectively. The justifying- members are arranged between plates 188, 190 carried by an axially-movable rod 187 which is connected to a pointer 195 arranged over a scale at the keyboard. The justifying-members that have been transferred to the magazine 196 are confined between shutters 176, 177 which are inserted in the magazines by pulling out a knob 235. The shutter 177 is mounted on a bar 178 which is trunnioned on brackets 179 on the paper-carriage. The shutter 176 is secured to an axially-movable rod provided with the knob 235. The shutter 176 is provided with a pin 182 for moving the shutter 177. Before preliminary typing of the line, a pointer 175 on the paper-carriage is set to line-length on a scale 172, and the shutter 177 is so adjusted on the bar 178 that the distance between the shutters is equal to line-length. The scale 172 comprises graduations which represent the normal and expanded thickness of the justifying-members and are employed with the aid of the pointer 175 for indicating when a set line is long enough to permit of justification. For determining the justified word-space, the justifying-members co-operate with an axially-movable rod 219 carrying a block 218 which is provided with a pin engaging an inclined groove 217a in a slide 217 connected to a knob 216. The block is provided with guides 222 for a slide 223 constituting a stop for the escapement-slide 32, the initial gap between the slides being equal to a normal word-space. The slide 223 is connected to a lever 224 operated by a space-key lever 227 which operates also the universal frame 2. After preliminary typing of the line, there are as many justifying-members in the magazine 196 as the number of word-spaces, and the distance between the shutters 176, 177 is equal to the line-deficit. The knob 235 is then pulled outwards to insert the shutters in the magazine, the lever 197 is depressed to expand the justifying-members until they fill the space between the shutters, and the knob 216 is pulled outwards until a stop on the end of the rod 219 engages the stop-lug 236 on the blade 1831 of the last justifying-member that has been transferred to the magazine 196. The slide 223 moves laterally with the rod 219, the movement being equal to the quotient of the line-deficit and the number of justifying- members in the magazine 196, and consequently equal to the amount by which the normal word-space must be increased to produce a justified word-space. The lever 197, knob 235, and pointer 195 are then restored to normal position to open the jaws of the magazine 196, withdraw the shutters 176, 177, and return the justifying-members to the magazine 184. After these operations, the line is again typed, the space-key lever 227 is depressed at each word-space to move the slide 223 into position for arresting the escapement-slide 32, and a justified word-space movement is imparted to the paper-carriage.