Patent GB-609605-A (GB)
Title: Improvements in dictating machines
Filed: 1946-03-18
Abstract: 609,605. Dictating-machines. DICTAPHONE CORPORATION. March 18, 1946, No. 8364. Convention date, March 28, 1945. [Class 40 (ii)] In a dictating-machine using cylindrical records, a control lever 37, Fig. 10, is provided for lifting and lowering the translation unit relative to the record, whereby the carriage B, Fig. 2, on which the translation unit is mounted, is back-spaced by a small amount in order to reproduce the last few words dictated, or is released from the feed screw 23 so that the carriage B may be moved manually to any part of the record for reproduction, the feed screw releasing means and the translation-unit-lifting means being coupled to a record-ejecting lever 11, Fig. 12, in such a manner that operation of the latter disengages the translation unit from the record and the feed nut 24 from the feed screw 23, and holds said translation unit and feed nut 24 disengaged until the carriage B has been driven back automatically to the starting position and a new record emplaced, after which the translation unit is automatically lowered to the recording position and the feed screw 23 re-engaged. When a back-spacing operation is being carried out after recording, the control lever 37 is pressed down to the fullline position shown in Fig. 10. The engagement of a pin 54 on a lever 52 in a slot 53 on control lever'37 which pivots about a point 38 causes the pin 51 on lever 52 to act against the cam 50 and lift the translation unit from the record. At the same time a slot 56 in lever 37 acting against a pin 57 on a rocking tube 12, on which the translation unit is suspended from a pivotal joint 17, Fig. 8 (not shown), causes the translation unit to be lifted so that the reproducing stylus 16 is held ready for engagement with the record. The downward movement of the control lever 37 and the rocking tube 12 also results in a lever 71, Fig. 6, being rotated about a point 72, said lever 71 being connected to another lever 78 having an enlarged part which rotates about a stud 79 and which has a cam lug 81 engaging a cam 82 on the end of a sleeve carrying an arm 84 on the end of which is mounted the feed nut 24. The cam lug 81 rides up the cam 82 and shifts the feed nut 24 in relation to the carriage B, and thereby effects a small amount of back-spacing of the carriage B which is thus withdrawn to the right, Fig. 2, from the advance slide C which is normally pushed along the bar 28 by the carriage B. The withdrawal of the carriage B from the pin 139 on the advance slide C permits the tooth 61, Fig. 11, on a latch lever 45, under the influence of a spring 68, to intercept a projection 59 on the end of the rocking tube 12 so that the translation unit is maintained in the reproducing position after release of control lever 37 which, acting under the tension of a spring 41, moves upwards at its free end and permits the reproducing stylus 16 to be lowered on to the record. When the carriage B again reaches the advance slide C the pin 139 re-engages the rod 65 and releases latch 45 so that the rocking tube 12 and the translation unit, under the influence of spring 41 on lever 37 and pin 57, is restored to the recording position. When it is desired to reproduce some other part of the record, the lever 37 is pressed down to its fullest extent so that lever 78 is moved sufficiently to bring a pip 88 into contact with a lever 90 which disengages the feed nut 24, after which the carriage B may be moved manually until the lever 37 is released, when the stylus will rest on the record in reproducing position until the carriage B again reaches the advance slide C. When a record is ejected by the lever 11, Figs. 2 and 12, which acts on a slide 10 and plunger 9, a further slide 101 rotates a lever 110 about a rod 111 having a forked lever 112 which rocks a bar 114, Figs. 2 and 6, and moves the lower end of the lever 90 to withdraw feed nut 24. At the same time the bar 114 also moves the lower end of the lever 52, Fig. 10, to lift the stylus from the record. The action of the slide 101 also brings a pawl 106 thereon into contact with the end of a lever 124, which rotates about a point 125 so that its other end moves a lever 127, Fig. 15, against a spring 130, about a point 128, and serves to engage a clutch 143, 144, whereby the cord 140 is wound on a sleeve to return the advance slide C and carriage B. A lever 132 moves under tension of spring 135 to intercept and retain lever 127 in position until the rod 34 on the advance slide C comes into contact with turned-up part 137 of the lever 132. The feed nut 24 cannot be re-engaged with the feed screw 23, or the stylus with the record, while the lever 112 is held in position by the slide 101 or the lever 122. Slide 101 is held in position by a spring friction member 105 until a new record has been emplaced, while lever 122 is held in position by lever 127 until advance slide C has been returned to starting position. During recordchanging, drive between the pulley 4 and shaft 3, Fig. 3 (not shown), is interrupted by the operator by means whereby the yoke 8 moves a sleeve connected to a ratchet engaging plunger 6 slidable longitudinally in a slotted end opening in the shaft 3.