Patent GB-666849-A (GB)
Title: Improvements in and relating to justifying typewriters
IPC: B41J19/64
Filed: 1947-07-31
Abstract: 666,849. Typewriters. COXHEAD CORPORATION, R. C. July 31, 1947 [Oct. 5, 1938], No. 20745/47. Class 100 (iv). A typewriter wherein carriage movement is controlled by a fixed escapement mechanism is provided with justifying mechanism which is set by the carriage movement during a portion of its travel while an unjustified line is being typed. The portion of the carriage travel mentioned occurs near the end of the unjustified line, the justified line being typed to the right of the unjustified line and the carriage being made of a suitable width to permit of this. The invention is described as applied to a machine employing removable type shuttles and having an escapement mechanism controlling the letterspacing movements of the carriage 11, Figs. 3, 5, which mechanism can be set by means of knob 8, Fig. 17, to vary the unit spacing as described in U.S.A. Specification 1,918,299. A rod 12 slidable longitudinally of the carriage has arms 14 carrying the escapement rack 15 so that the carriage is movable relatively to the rack. Bellcranks 17 on the carriage have arms 19 engaging between lugs 21 on the rack and are connected by a control-bar 24 which, if maintained at a constant horizontal level causes the carriage and rack to have equal movements, but which if moved downwardly will cause the carriage to receive a greater movement than the rack. A bracket 37 adjustable on the bar 24 carries a roller 38 which runs on a track comprising a horizontal bar 25 and a bar 35 pivoted thereto at 36, and the arrangement is such that during typing of the unjustified line, the roller 38 runs on the bar 25 and no relative movement takes place between the carriage 11 and the rack 15 and during typing of the justified line, the carriage receives an increment of movement depending on the inclination of the bar 35 which is set automatically according to the space to be filled out in the unjustified line. For this purpose, at a point near the end of the unjustified line, an alarm is sounded and a stop 41 on the carriage engages a stop 44 on a bar 45. If further letters are typed, the stop 41 moves the bar 45 endwise and through a crank 51 rotates a shaft 52 carrying an arm 54. A pin 55 on the arm engages a pin 56 on a ratchet head 57 fixed to a sleeve 59 free on the shaft 52. An arm 60 on the sleeve 59 is connected by a link 61 to a sleeve 62 slidable on the bar 35 and connected by a link 64, Fig. 10, to the machine frame. Thus as the bar 45 is moved forward by the stop 41 during the typing of additional letters, the bar 35 is raised and the incremental movement imparted thereby to the carriage during typing of the justified line is decreased. The parts 57-62 and the bar 35 are held in set position by a pawl 74 engaging the head 57. When the unjustified line has been completed, a tabulating key 89, Fig. 18, is depressed. Through a connection 99 it releases the escapement as described in U.S.A. Specification 1,964,750 and through another connection 95 it depresses the stop 44 so that the carriage now tabulates under its spring drive until a stop 103 on the carriage engages a tabulator stop 104 raised into operative position by the depression of the key 89 as described in U.S.A. Specification 1,964,748. The carriage position now corresponds to the beginning of the justified line to which position the pivot connection 36 has previously been set by means of a knob 31, Fig. 10. The roller 38 has also previously been adjusted on the control bar 24 so that at the end of tabulation it is situated at the junction of bars 25, 35. Upon retyping the line, the downward movement of the bar 24 due to the travel of the roller 38 on the inclined track increases the spacing movements of the carriage to effect the required justification. Upon the return movement of the carriage, a stop 116, Figs. 5, 18, thereon engages the stop 44 to restore the parts 45, 51, 52, 54. A part of the arm 54 engages a pin 117 on the pawl 74 to lift the latter whereupon the parts 57, 60, 61 and 35 are restored by the weight of the bar 35. A pointer 48 is actuated by a rack-and-pinion gear from the bar 45 to indicate the number of letters typed after the alarm has sounded. For very short unjustified lines, the pointer 48 is moved to its extreme position wherein through the bar 45 and associated parts the bar 35 has been moved to an horizontal position so that the retyped line on the right-hand side of the sheet is the same length as that on the left. The slope of the bar 35 is given an initial adjustment according to the normal length of the lines to be typed by moving the knob 31 carrying the pivot 36 longitudinally of the machine to a set position indicated by a scale. The locking pawl 74 is slidable axially on its pivot 73 and is movable by connections 75, 77, 78 from the knob 8 so as to engage one of four ratchets 69-72 each of which corresponds to the selected unit-spacing obtained by setting the knob. Operation of the knob 8 is prevented when the pawl 74 is operative i.e. after the ratchet-head 57 has been moved into engagement therewith by a member 88 on the bar 45 engaging locking-segments 87 on the rod 86 moved by the knob. Specification 519,657 also is referred to. According to the Specification as open to inspection under Sect. 91, justification may be effected by using a variable-unit escapement, set to establish different feed units for the carriage. This subject-matter does not appear in the Specification as accepted.