Patent GB-723942-A (GB)
Title: Improvements to end-of-line justifying typewriters
IPC: B41J19/64
Filed: 1952-07-30
Abstract: 723,942. Typewriters. LEGLISE, P. July 30, 1952 [Aug. 17, 1951], No. 19307/52. Class 100(4). In end-of-line justifying typewriters of the kind described in Specifications 715,115 and 717,947, the blank typing to determine the number of characters to be printed in a terminal segment of a line is effected by the character keys so that blank typing is done at normal typing speed, printing being prevented by a stop which when in operative position prevents the type bars from touching the platen. Alternatively, the stop may be placed in front of the ink ribbon, or between the ribbon and the paper, so that impression is taken on the stop. As shown in Figs. 2, 3 the type-lever is prevented from making a complete impression stroke by blocking a space f on the usual type-guide G mounted on a type segment S. The space is blocked by a stop or limiter K integral with a pivoting shutter V turned about an axis O by a link t, operated manually or automatically by a margin stop, set to operate the shutter V at the beginning of a terminal segment. The shutter V is held in either position by a spring z engaging in recesses o, o<SP>1</SP>, and its travel is limited by a slot l occupied by a large headed screw v fixed to the guide G. The limiter K comprises a replaceable metal washer R 2  having a slot e2 therein, which when in the position shown, allows a centring wedge of a type-lever to pass into the space f to effect impression. The washer R2, together with a washer R1 forming the spindle of the shutter, are riveted to the shutter at n. Coincident slots e1 in the washer R1 and the shutter V are twice the width of the slot e2 so that when the shutter is pivoted counter-clockwise, a metal surface of the washer R2 is presented below the space f where it prevents the type-levers from making an impression. In one modification, Fig. 6 (not shown), the limiter K is formed by a tongue pressed out of the shutter V which vertically slides on the guide G. In a modification, Fig. 11, the limiter K is in the form of a pin mounted in a block K1 integral with a plate k horizontally slidable by a mechanism controlled from the keyboard. Alternatively this form of limiter may be provided with an upright extension for manual operation. As shown in Fig. 23, the limiter may comprise a replaceable spring steel clip V having a rubber pad K and is slidable vertically to block the guide space. As the pad engages the type-levers below the centring wedges, it is made of sufficient width to engage type-levers approaching from different angles. In the embodiment shown in Fig. 27, the type-levers during the blank-typing of the terminal segment make a full stroke but impression is prevented by a stop or shield V slidably mounted on the usual scale C either in front or behind the ink ribbon. Alternatively the shield V may pivot about a point vertically below the impression position. Warning is given to the operator that the terminal segment. is reached by the actuation of a bell. The stops may be controlled by a detachable coupling from a mechanism changing the colour of the ink-ribbon.