Patent GB-998203-A (GB)
Title: Improvements in or relating to typewriters
Inventor: NAGY ISTVAN
IPC: B41J19/64
Filed: 1961-10-19
Abstract: 998,203. Typewriters &c. IRODAGEPIPARI ES FINOMMECHANIKAI VALLALAT. Oct. 19, 1961, No. 37680/61. Heading B6F. A typewriter for producing justified typescripts has a variable escapement mechanism, a word space counting device, a device for indicating the number of spaces from the desired margin at which the typing ends, and means to vary the space movement between words. Variable escapement mechanism.- A ratchet escapement wheel 5 is held against clockwise rotation by a pawl 15, Fig. 1, and is driven in an anticlockwise direction by a carriage driving wheel 6 through a clutch mechanism. In a rest position the wheel 5 meshes with an intermediate wheel 18 which also engages a toothed rack 23. When allowed to move, a striker pin 28 of the rack 23 engages a striker plate 35, Fig. 4, which movement will allow a three unit escapement movement or if the type key used actuated one of the other striker plates 33, 34, 36, 37, through engaging a lug 47 on one of the control bridges 41 to 44 one, two, four, or five, unit escapement movement is allowed. Actuation of a type key engages a pawl 22 with the wheel 5 and releases the intermediate wheel 18 so that a spring 25 can move the rack 23 until the pin 28 strikes the striker plate made operative by that key. Release of the key re-engages the wheel 18 and releases the pawl 22 so that the carriage drive wheel 6 drives the wheel 5 until the rack 23 is restored the distance it was originally allowed to move and a corresponding escapement movement occurs. Word space counting.-Depression of a space bar 95, Fig. 12, acts through a linkage 118, 119 to cause a pawl 116 to move a ratchet wheel 113 in the direction 113a and thus to advance a counter wheel 115. A spring 122 (Fig. 13, not shown), tends to return the counter to zero with a pin 141 engaging a plate 142 but is mainly prevented from doing so by a pawl 123 engaging the ratchet wheel 113. On carriage return a margin stop arm engages a pin 137 to rotate a shaft 136 an arm 138 of which disengages the pawl 123 to allow the counter wheel to return to zero or this disengagement can be effected manually by pressing a lug 140a. Upon release of the pawl 123 it is latched in its disengaged position by a bent arm 128a engaging the pawl hook 126a so that after completion of carriage return spacing movements can be effected for indenting without them being counted. Subsequent depression of any type key 129 causes its lever 130 to engage a cross rail 133 which by an arm 132 pulls down a rod 134 to disengage the bent arm 128a from the hook 126a so that a spring 124 can re-engage the pawl 123. Justifying.-Typing of an original line is continued until the desired right-hand margin is approached in which position a lug 56a, Fig. 7, of an arm 56 of a margin stop engages a pin 60 which by a linkage moves a pointer 64a to indicate the number of spaces the last type is from the desired margin and this is noted in the margin. From the number of word spaces indicated on the counter wheel 115 it can be calculated where it is necessary to alter the size of the spaces between the words. This alteration is effected in typing the justified copy by a setting lever 73, Fig. 10, which moves a shaft 86 longitudinally to position a striker member 89 over one of the control bridges 41-44 so that when on depression of the space bar 95 a striker plate 103 rotates the shaft 86 so that the striker 89 actuates the bridge it is positioned over and the size of the spacing movement that is effected corresponds to the selected bail.