Patent GB-235577-A (GB)
Title: Telegraph typewriters
IPC: H04L17/22
Filed: 1924-06-23
Abstract: 235,577. Kleinschmidt Electric Co., Inc., (Assignees of Kleinschmidt, E. E.). Aug. 11, 1923, [Convention date]. Electric type - lever machines. - A printing telegraph machine comprises slotted selector members such as the selector bars 617 . . 621, members controlling the movement of the selector members such as armatures 606 for electromagnets 601, and means for partially restoring actuated control members before restoration of the selector members but for restoring completely the control members only after restoration of the selector members. In this way an overlap of selections in the selecting mechanism is secured. Each selecting bar is formed with five notches. In one of the notches an extension 612 of the armature 606 engages a shoulder to hold the bar in unselected position, the extensions 612 of the other armatures being positioned in the centre of their corresponding notches. Adjusting members 613 pivoted at 614 engage the extensions 612 so as to position them in correct relation to the notches. Latches 628 normally rest against the ends of rearward extensions 627 of armatures 606 and on actuation of any one armature a latch 628 is released, the extension 627 rides over it and is thus locked in actuated position. The latch 628 also actuates a bail 639, fixed at its ends in a shaft 644, Fig. 5, and so rocks a member 645 fixed to this shaft. A lug 647 on a member 646 is held against member 645 and member 646 is therefore moved from under a block 659 on the armature 654 of an operating magnet 653. A block 660 on this armature moves a pawl 677, Fig. 6, pivoted at 678 on a member 675 and when a screw 661 also on armature 654 has depressed a member 667 which normally engages a shoulder on the bars, the selector bars move over the pawl 677. Alignment of the slots of the selector bars permits selection of an actuating bar 108, Fig. 2. Further movement of armature 654 causes the block 659 on the armature to engage a shoulder on a bar 705, pivoted on ears on an arm 701, and so moves arm 701 to press a contact 698 against a contact 699. This movement permits a spring-pressed arm 708 to rise and lock the arm 701. Contacts 698, 699 close a circuit for a printing solenoid 688, attached to the core of which is an arm 686 fastened to a shaft 685. Rotatable with shaft 685 are end pieces 691, Fig. 8, on which are pivotally supported members 693 carrying a printing bail 128, Figs. 2 and 8. Movement upwards of the printing bail 128 permits a bar 108 to fall into the aligned slots in the selector bars and then moves the bar 108 upwards in the slots to print a character. As the bail 128 moves upwards spring 694 is stressed and a uniform printing impact is thus ensured. Upward movement also causes an arm 684, Fig. 6, to move away from a pin 683 on the member 675 and allows member 675 to be moved more to the left by spring 686 and also allows pawl 677 to be moved under the influence of its spring into a position to engage the ends of the selector bars. This last movement is limited by a stop 679. Whilst the printing bail is being actuated armature 654 begins to restore and member 667 is allowed to contact with a second shoulder 669 on the selector bars to hold them in selected position. Further outward movement of armature 654 causes a pawl 713, pivoted to it, and which had on the inward movement ridden over ratchet 651, to turn this ratchet and so turn member 645 which moves to allow the member 646 to rotate shaft 644 and move the bail 639 against the latches 628, Fig. 2, thus allowing partial resetting of the armatures 606; but as the selector bars are locked in position the extensions 612 engage the lower edges of the selector bars. The selector magnets are, however, in a position to receive the next selection and the selected armatures are again locked in attracted position. Towards the end of the printing stroke the bail 128 engages the end 712 of arm 708 which releases arm 701 and contacts 698, 699. Printing magnet 688 is de-energized and the printing bail structure restored under the influence of spring 690. The bars 108 are disengaged from the slots in the selector bars. Members 684, Fig. 6, engages pin 683 and forces member 675 to the right causing the pawl 677 to move the selector bars to unselected positions. The armatures 606 of those magnets not energized by the next selection are thus completely restored by moving into the slots in the selector bars. Specifications 218,643 and 220,280 are referred to. The Specification, as open to inspection under Sect. 91 (3) (a) describes also a modification of the restoring mechanism for use with a cam actuated printing mechanism, Fig. 9 (Cancelled). The selector bar restoring and locking parts and the printer magnet contacts are eliminated, leaving however the pawl 713, ratchet wheel 651 and and bar 705. The bar 705 has pivoted to it an arm 719, Fig. 9, secured to a spindle 717. Operation of bar 705 by armature 654 of operating magnet 653 causes rotation of shaft. 717 and removal of latch 716 mounted thereon from member 76 to permit the selected bars to move into position, and rock spindle 79 to initiate operation of the printing shaft. Restoring motion of armature 654 operates ratchet wheel 651 to condition the selector magnets for the succeeding selection. At the end of the printing stroke the cam rotation spindle is rocked to operate selector bar restoring member 77 mounted on spindle 79. This subject-matter does not appear in the Specification as accepted.