Patent GB-672642-A (GB)
Title: Improvements in and relating to justifying typewriters
IPC: B41J19/64
Filed: 1945-06-25
Abstract: 672,642. Typewriters. TRIGGS, W. W. (Coxhead Corporation, R. C.). June 25, 1945, No. 6166/48. Divided out of 672,633. [A Specification was laid open to inspection under Sect. 91 of the Acts, Jan. 9, 1946.] Class 100 (iv). In a typewriter wherein letter-spacing is effected by escapement devices and varies according to the width of the letter being typed, a justifying mechanism is provided which imparts movement to the carriage relative to the escapement rack to effect line justification, the justifying mechanism being set by the carriage movement and secured in the set position by a friction lock. The justifying devices are described as applied to the machine forming the subject-matter of Specification 672,633. The paper carriage 16 is of sufficient width to allow of the use of a wide sheet of paper and is provided with means whereby after a line is typed normally in a column on the left of the sheet, a justified line is typed in a column to the right of the first column. For this purpose the carriage 16, Fig. 7, is carried by links 119 engaging between blocks 121 on the escapement rack 31 so that the parts 16, 31 are capable of relative movement, and by links 122 connected by a control bar 124 having mounted thereon a roller 138 running on tracks 125, 135 which control such movement. While the roller 138 is on the horizontal track 125, i.e. during the typing of the unjustified line, the carriage and rack movements are the same, but as the roller 138 runs down the track 135, i.e. during the typing of a justified line, the carriage movement is increased, such increase depending on the slope of the track 135 which is pivoted at its end adjacent to the track 125. One end of the track 125 is attached at 130 to a sleeve 131, Fig. 10, to which the track 135 is pivoted at 136, the sleeve being adjusted along a toothed bar 127 so as to be opposite a tabulator stop 203 on the carriage determining the left-hand margin of the justified column. A sleeve 162 slidable on the track 135 is connected by a link 164 to a fixed pivot, so that during adjustment of the sleeve 131, an initial adjustment of the slope of the track 135 occurs. When the end of the unjustified line is being approached, a stop 141 on a rack bar 142 on the carriage engages a stop 144 on a bar 145 connected to a pointer 148 indicating the line space remaining at the end of the unjustified line. At the same time an alarm is actuated. If a few more letters are typed, the stop 141 moves the bar 145 endwise thus turning a shaft 152 carrying an arm 154 with a projecting pin 155 engaging a pin 156 on another arm 158 on a sleeve 159 rotatable on the shaft 152. This sleeve carries an arm 160 connected by a link 161 to the sleeve 162 on the track 135 which is moved upwardly and thus decreases the increment of spacing imparted to the carriage during typing of the justified line. The arm 158 has an arcuate edge 158a which is engaged by a friction locking device described below to fix the track 135 in its adjusted position. When the unjustified line is completed, a tabulating-key 110, Fig. 18, is depressed. This causes in the following sequence (1) release of the stop 144 from the stop 141 by levers 191, 194 and link 195 (2) setting of a dog 204 in the path of the tabulator stop 203 through levers 209, 210 and 205 on the latter of which the dog 204 is pivoted and (3) release of the retaining dog 105, Fig. 5 (not shown) of the escapement devices by means of levers 111, 111b actuating a trip rod 111a engaging the tail 112 of the dog. The carriage is now free to move under the influence of the carriage drive and tabulates to the position in which the members 203, 204 engage. This position corresponds to the lefthand margin of the justified line and the roller 138 is now adjacent to the pivoted end of the track 135. At the same time as the tabulator dog 204 is set, a catch 205a on the lever 205 is released from a pin 115 on a pivoted cam-plate 174 so that the latter moves under the action of a spring until its cam edge 174a engages the edge 158a of the plate 158 and thus locks the plate 158 and therefore the track 135 in the position to which they have been set. Typing of the justified line can now proceed. When the carriage is returned, a preset stop 216 on the rack bar 142 engages the stop 144 and returns the parts to their initial position. During this operation the upper end of the arm 154 engages a roller 173 on the cam-plate 174 and pivots it to the position in which it is reengaged by the catch 205a. If the unjustified line is a very short one, the amount of justification is adjusted by setting the pointer 148 and therefore the operating bar 145 by hand. Slight adjustment of the carriage position which may be necessary at the beginning of each unjustified and justified line is effected in conjunction with a carriage-position indicator as described in Specification 672,637, [Group XXXV]. Specifications 519,657, 657,842, [Group XXXV], and 666,849 also are referred to.