Patent GB-231815-A (GB)
Title: Telegraph typewriters
IPC: H04L17/22
Filed: 1924-07-04
Abstract: 231,815. Kleinschmidt Electric Co., Inc., (Assignees of Kleinschmidt, E. E.). April 3, 1924, [Convention date]. Electric type-lever machines. - In a selector mechanism for a type-printing receiver adapted to be started into operation in response to a predetermined electrical condition, to effect the selection in response to a code combination of marking and spacing conditions, and to be arrested in response to a predetermined electrical condition, the timing of the operation is corrected by means controlled by one of the conditions of the code combination. Figs. 2, 3, 4, 7, 9, and 12 show the application to a non-interfering mechanical action selector of the kind described in Specification 218,643, in which an electromagnet, energized or not according to the character of the receiver impulses, controls the positioning of selector bars by impacting axial movements to a start-stop shaft carrying a series of pins, one corresponding to each bar. Figs. 18 to 20 show the application to an interfering mechanical action selector. For positioning the selector bars 59 - - 63, Figs. 2, 3, and 4, the pivoted armature 9 of the receiving magnet 8, normally retracted by a spring, is operated upon energization of the magnet to cause its extension 11, Fig. 12, to bear on one end of the start-stop shaft 15 to move this shaft axially against the action of a spring 23, the other end of the shaft sliding in a hollow shaft 18 driven through a friction clutch from a shaft 26 continuously driven through gearing 27, 28 from a shaft 29. The pivot 10 of the armature may be carried by a bracket 152, Fig. 12, adjustable about a fixed pivot 153 to enable the air gap to be varied. A member 19 secured to the shaft 18 is formed with an extension 20 provided with a slot 21 engaging a pin 22 secured to the shaft 15 to enable the shaft 15 to be driven from the shaft 18. The shaft @5 carries pins 54 - - 58 which, as the shaft rotates, actuate or fail to actuate corresponding pivoted fingers 37 - - 41 for positioning the selector bars 59 - - 63 respectively according to whether the magnet 8 is or is not energized. The shaft 15 completes a revolution in a period slightly less than that required for the transmission of a starting impulses, five signalling impulses, and a stopping impulse, and is held stationary between two signalling periods by a pin 34 on the shaft bearing against an adjustable stop 30, and increased speed and reliability are obtained by the provision, according to the invention, of an additional stop 150, Fig. 12, to coact with the pin 34 at the end of the last signalling impulse, whenever this impulse is different in character from the stopping impulse. The starting impulse moves the shaft to the left to bring the pin 34 opposite a notch in the stop 30, whereupon the shaft is free to rotate until arrested by the stop 150 or the stop 30. Each selector bar 59 - - 63 is normally held to the left in Fig. 2, against the action of a spring 65, bv the engagement of the corresponding finger 37 - - 41 with a lug 71 between notches 69, 70 in its lower edge. Each finger, when actuated by the corresponding pin 54 - - 58, is moved clear of the lug 71 and is locked in this position by the engagement of a corresponding latch 44 - - 48, Fig. 4, with a shoulder 53 on the finger. The latches 44, 45 are lifted by the pins 34, 55 respectively to restore, if necessary, the corresponding fingers 37, 38 during the starting interval of the succeeding signalling period, and the restoration of the elector bars is effected during this interval by devices actuated from the cam 19. Latches 46, 47, and 48 are similarly lifted by the pins 56, 57, and 58 during the first, second, and third signalling intervals respectively of the succeeding period. During the stop interval the member 19 trips a member 73 to release a bell-crank lever 76 provided with an extension 77 bearing against the ends of the selector bars. The springs 65 associated with the released bars thereupon move these bars to the right, Fig. 2, thus moving the lever 76 and rocking its spindle 79 to trip a clutch mechanism to effect printing. A series of bars 108, each connected to a corresponding type-bar actuating arm or other printer mechanism, extends across the selector bars 59 - - 63, and is supported on a bar 125. When the selector bars are in position corresponding to a selection, the bar 125 is moved by the action of a cam 91 on a sleeve 88 on the shaft 29, thus enabling the selected bar 108 to enter aligned notches in the bars 59 - - 63 to effect the desired actuation and to disengage the notches, whereupon the bars 59 - - 63 are restored to normal position by the action of a cam 90 on the sleeve 88. This sleeve is clutched to the shaft 29 by the action of an arm 87 on the spindle 79 when this spindle is rocked, and rotates until its cam 90 acting on a roller 86 carried by an arm 85 on the spindle rocks the spindle in the reverse direction to restore the selector bars and to place the arm 87 in position to declutch the sleeve. Figs. 18 to 20 show an interfering mechanical action selector in which discs 186 - - 190 on a shaft 161 driven through a friction clutch coact with corresponding selector members 192 to set these in accordance with a sequence of impulses received by a magnet 183. The starting impulse actuates the armature 179 to move a member 176 from the position of Fig. 20 to that of Fig. 19 to release a trip arm 173 on a spindle 171, thus enabling a stop 169 on the shaft 161 to move a retaining arm 170 on the spindle 171 against the action of a spring 174. The shaft 161 is stopped at the end of a revolution by the re-engagement of the stop 169 with the arm 170 as shown in Fig. 20, but if the polarity of the last signalling impulse is different from that of the stopping impulse, the shaft is preliminarily stopped at the end of the last signalling impulse in the position shown in Fig. 19, by the engagement of a pin 185 on the disc 186 with an extension 178 of the member 176.