Patent GB-748121-A (GB)
Title: Printing telegraph apparatus
Inventor: KLEINSCHMIDT EDWARD E
IPC: H04L17/00
Filed: 1951-07-06
Abstract: 748,121. Type-printing telegraphy. KLEINSCHMIDT LABORATORIES, Inc. July 6, 1951, No. 16074/51. Class 40 (3). [Also in Group XVI] In a printing-telegraph receiver comprising a selector mechanism which converts permutated groups of pulses into mechanical movement, a movable carriage carries a number of type-bars, and a single element carried by, but movable independently of, the carriage and positioned by the selector mechanism, selects a predetermined type-bar in response to a received group of impulses and a predetermined member of a plurality of function operating means is controlled by the mechanical movement of the selector mechanism to perform a desired function corresponding to a received group of impulses. Keyboard transmitter. On the depression of a key lever 52, code bars 64 are selectively moved to the right or left and the universal bar 76 is moved to the rigl t. The end of the universal bar engages an adjustable screw 132 mounted in an arm integral with a latch member 128 having a ledge 126 on which a projection 124 of a start-stop lever 114 is supported in the stop position of a cam-shaft 92. Selector levers 82 engaging in notches 80 in the code bars 64 latch associated contact-operating members 86 against a stop member 158 when the bars 64 are moved to the right and the opposite ends of the member 86 have rectangular openings 154 engaging square blocks 156 mounted on a pivoted axis 116. The contact members 86 are sequentially engaged by helically-arranged cam projections 112 on a cam drum 110 during a half revolution of the shaft 92 so that the members 86 are selectively rocked about the latched end if the associated code bar 64 has been moved to the right or about the axis 116 so that contact members 164, 166 engaged spring-pressed plungers 168, 170 to apply marking or spacing impulses to the line. Appropriate cams on the shaft 92 control contact-operating members 86 to apply the stop and start impulses of the code combination. The operation of a key lever 52 causes the ledge 126 to move to the left so that the lever 114 drops under the action of a spring 122 and removes a projection 118 from engagement with a tooth 120 on the cam sleeve. At the same time, a knife-edge 184 carried by an arm 186 integral with the arm 114 engages in front of and behind, projections 188 on the selector levers 82 so that the keyboard is locked until the selection set up has been transmitted. Towards the end of the half-revolution a cam engages a projection 190 on the extension of the arm 114 which is rocked against the action of the spring 122 to arrest the cam sleeve 111 on the shaft 92. If the operated key has been released, the projection 124 is supported on the latch member 126, but if the key has not been released, a second latch member 140 attached by a spring 142 to the first latch member, moves to the left so that its ledge 138 slides under the projection 124 on the lever 114. When the actuated key is released, the latch 128 rotates so that the auxiliary latch 140 is pushed to the right and the projection 124 is again supported on the ledge 126 of the first latch member. Repeated transmission of the spacing signal. When the space bar 192 is actuated, its lever 196, similar to the levers 52, moves the universal bar 76 and the third permutation bar 64 to the right, releasing the cam drum to transmit the appropriate code combination. The lever 196 also engages the toe 198 of a pivoted member 200 having a projection 204 engaging an ear 206 on the latch member 140 so that its ledge 138 is unable to move to the left underneath the projection 124 of the lever 114 when it is raised by the cam associated with the projection 190, and the lever 114 is able to drop again to allow the cam drum to continue its rotation until the release of the spacing key permits the universal bar 76 to rock member 128 so that the lever 114 is supported on the ledge 126 with projection 118 in the path of the tooth 120 of the cam drum 110. Selecting-arrangement of the receiver. The received impulses operate a magnet 220 having an armature with a thin end 254 engaging, in the attracted position, a recess in a start-stop lever 258 and shaped recesses in selector members 288 having projections 301 engaged by helically arranged cams 300 on a shaft 276. The cams are held in the stop position by a member 268 engaging a projection 264 on the lever 258. The members 288, which are similar to the members 86 of the transmitter, are latched at the righthand end by the armature 224 in the attracted position and slide on the squared block 294. They rock about the shaft 262 carrying the squared block 294 when the armature is in the released position. The movements applied to the members 288 selectively position Y-shaped levers 310 frictionally mounted on a shaft 312. After the five members 288 and the Y-levers 310 have been set during a half revolution of the shaft 276, the innermost cam 300 rocks a lever 350 so that a latching projection 356 releases a pivoted arm 360 having a short shaft 370 carrying five T-members 372 which are lowered towards the Y-members 310 and selectively rocked by the engagement of a depending leg part 374 or 376 with the arm 306 or 316 respectively of the Y-members. The rotations of the T-members 372 are applied to five code rings 386 mounted on a hollow shaft 388 with internal and external notches 404 operatively associated with stop-bars 400. The arm 360 is secured to a shaft 362 and its rotation rocks clutch latch 418 which allows a clutch dog 420 to slide to the right so that toothed member 426 engages with clutch teeth of the wheel 428 driven by gearwheel 430 from the constantly-driven power shaft 104. The function cam -shaft 414 is driven through half a revolution and drives the shaft 416 carrying the stop arms at twice its own speed, slipping of wheel 452 taking place when the long or short stop-arm 444 or 442 is arrested. Soon after shaft 414 commences its rotation, a cam 368 restores the lever 360 to its normal position in preparation for the transfer of the next selection. The squared shaft 416 controlled by the stop arms rotates a shaft carrying a spider positioning finger 456 co-operating with a type-bar operating spider 458 having diametrically opposed arms 460, 462 whose ends can be located opposite the end of bars 510 linked by rack 512, 514 to the type-bars 516. A cam 504 on the shaft 414 rocks a lever 500 carrying a printing-bail member 486 extending across the width of the platen 520 so that the end of the rotationally positioned spider engages the bar 510 and actuates the corresponding type-bar 516, a spring 524 withdrawing the bar 510 after actuation. Ribbon positioning arrangement. The end of the shaft 476 carrying the spider 458 engages a pivoted lever 544 which rocks a lever 552 connected with a swivel member 556 and adjustable member 558 to a pivoted member 562 carrying an arm 568 attached to a ribbon guide 538 sliding on a support 540 so that the inking ribbon 536 is raised at each printing operation. The member 562 is pivoted to a member 578 attached by an arm 582 to the underside of the support for the platen 520 so that the raising of the latter for upper-case characters automatically lifts the ribbon support 540 to a corresponding higher position. Ribbon feed and reversing mechanism. The inking ribbon 536 is carried on spools 586, 587 rotatable on spindles 584, 585 having spring- pressed retaining clips 589, 590. The winding spindle in operation, spindle 584 as shown, is driven by a bevel gear 592 engaged by a bevel gear 596 on a shaft 600 driven by a gear-wheel 592 engaged by a bevel gear 596 on a shaft 600 driven by a gear-wheel 608 engaged by a rack on the platen and operated for each character spacing operation. When the ribbon on a spool becomes exhausted, for example that on spool 587, a pivoted lever 626 disposed opposite a window in the core of the spool rotates about its pivot 630 and rocks a cam lever 640 so that its lever end 642 is positioned under a cam 644 having two lobes disposed at 180 degrees, and a pin 646 carried by the member 640 engages a slot 648 in a rocking arm 650 so that the gearwheel 594 on a slidable sleeve is brought into engagement with gear-wheel 598 on the shaft 600. A pointed member 668 co-operates with a pivoted detent member 670 to accelerate the movement of the cam 650 and effect locking in its operated position. The members 622, 624 are operated manually by the handles 682, 684 to enable the empty spools to be withdrawn. Control of functions.-Functionsare mainly controlled by an arm 686 rotated by a spider 695 on an extension 688 of the shaft 416 and moved axially by a function cam 690 on the shaft 414 towards a guide block 694 having longitudinal recesses in which are housed function bars such as 732, 734, 736, 738, shown in Fig. 30. Some of the functions, namely line-feed, figure-shift and carriage-return are controlled by auxiliary stop-bars 406, 408, 410 corresponding to the bars 400 for selecting the characters to be printed, but these bars do not engage the stop arm 405. Spacing operations.-The function cam 690 moves the lower end of a lever 698 to the right and the function selecting arm 686 to the left. When a normal character is received, the arm 686 is blocked by the member 694 and further rotation of the cam 690 causes the lever 698 to pivot about its upper end and move stud 702 to the right so that a lever 704 is rocked about pivot 706 and its projection 722 strikes a projection 723 on the spacing lever 724 which moves a link 728 to the right to actuate the spacing mechanism. For normal functions, the arm 686 is blocked in its leftward movement and the lever 704 is not rocked by the lever 698. For the deliberate spacing operation a function bar 734, moved to the left by the arm 686, rocks a lever 742 supported on a stud 726 so that its lower edge 748 strikes a lug 750 on the lever 724 and moves link 728 to operate the spacin