Patent GB-235561-A (GB)
IPC: H04L17/22
Filed: 1925-06-08
Abstract: 235,561. Morkrum - Kleinschmidt- Corporation, (Assignees of Krum, H. L.). June 13, 1924, [Convention date]. Electric type - lever machines. - In a typeprinting telegraph comprising type-levers connected to actuating-bars controlled by permutation bars and having a common driving - member actuated by an intermittent cam-shaft, the cam-shaft is arranged to lock the permutation bars so as to permit advance setting of a series of magnetically controlled, spring-actuated selectors for the permutation bars; the permutation bars control also actuating- bars for case-shift and spacing mechanisms and a signal bell, and to permit printing on a sheet or a tape the machine is provided with interchangeable top plates carrying a platen roller and a platen disc, the spacing-mechanism on the top-plates being separable from that on the main framework. Permutation bars 42, controlling actuating-bars 40 for type-levers 35, and actuating-bars 40a .. 40e for the spacing &c. mechanisms, are guided longitudinally by combs in a bracket 43 and are actuated by selectors or levers 68, Fig. 4, which are urged to the left by springs 69 but are normally detained by latches 71 engaging plungers 72 actuated by the armatures 74 of electromagnets 75. A cam shaft 59 is provided with a one-revolution clutch 82, 83 controlled by a sixth-pulse magnet 76, the movable member 82 of the clutch being normally detained by a lever 79 latched by the armature 78 of the electromagnet. When the lever 79 is released, a spring 87 moves the member 82 into engagement with the continuously-driven member 83, and when the cam shaft completes a revolution the lever is restored and the member 82 is disengaged from the member 83. The cam shaft is provided with a cam 91 controlling a spring- urged lever 46 for locking the permutation bars, and a cam 92 controlling a spring-urged lever 95 carrying a bar 96 for returning the levers 68. The lever 95 may be provided with an adjusting- screw 97 bearing on an arm 98 engaging the cam. When a signal is received, one or more of the levers 68 are released and move the associated permutation bars, and the cam shaft is started. Thereupon, the cam 91 permits the lever 46 to lock the permutation bars, and the cam 92 permits the lever 95 to return the levers 68 into engagement with their latches. The lever 95 then recedes and permits the levers 68 to be set in accordance with the succeeding signal, during the time that the cam shaft is operating the type-levers and the spacing-mechanism. At the end of a revolution, the lever 46 releases the permutation bars and permits them to be returned by springs 70. If any of the permutation bars are required for successive signals they are retained in the displaced position by the associated levers 68. 'I'he levers 68 engage a link 90 connected to a lever 89 normally obstructing the lever 79, are arrangement preventing the cam shaft from being operated when the electromagnet 76 alone is energized. The type-levers 35, Fig. 1, are pivoted on an inclined segment 36 and are connected by links 38 to sub-levers 37 carrying the actuating-bars 40, which have shoulders 48 for engaging a common driving-bail 49, engagement being normally prevented by a bail 47. The bails 47, 49 are secured to shafts 50, 51 connected by links 53 to rockers 54, 55 co-operating with cams 57, 58 on the cam shaft. The bails are connected to actuating-springs 62, 63, the spring 63 being connected to a lever which can be adjusted by a screw to vary the tension. At each setting of the permutation bars, tht bail 41 rises and the actuating-bars are raised by springs 41, the selected actuating-bar being raised into the path of the bail 49 and being moved thereby to actuate the associated typelever. If the spring 63 fails, the movement of the bail 49 is effected by a cam 61 engaging an arm 60 on the rocker 55. When the type-lever approaches the printing point, the bail 49 swings over the shoulder 48, the movement of the typelever being then completed by momentum. The spring 41 returns the type-lever and actuating- bar to the normal position. An actuating-bar 40b for the line-spacing mechanism, and actuating-bars 40c, 40e for the case-shift mechanism are operated in the same manner as the actuating- bars 40. To ensure positive operation of the actuating-bars 40b, 40c, 40e by means of the cam 61, the shoulders on these bars are made higher than those on the actuating-bars 40. Actuating- bars 40a, 40d for the carriage-releasing mechanism and a signal-bell hammer are not moved by the bail 49 but are merely lifted by their springs 41. Case-shift mechanism; alarms. - The typelever segment 36, Fig. 1, is shifted and locked by means of the actuating-bar 40e, Fig. 5, and is released by means of the actuating-bar 40c. The segment is connected by links 138 to a rockshaft 139 having an arm provided with two screws of which one rests on a rocking arm connected to the actuating-bar 40e, and the other engages a latch connected to the actuating-bar 40c. The actuating-bar 40d for the signal-bell hammer and an actuating-bar 40<1> connected to a type-lever bearing only one type may be selected by the same combination, the actuating-bar 40d being normally locked by a lug on the actuating-bar 40e. If the actuating-bar 40e is operated, the lug locks the actuating-bar 40' and releases the actuating-bar 40d. Paper carriages and supports; paper feeding and guiding arrangements.-The platen roller 14, Figs. 1 and 5, slides on a square shaft 15 journaled in brackets on the top plate 12 of the machine. A carriage 17 is provided with a bar 19 and a rack 23 engaging a roller and a feed-pinion 22 on a shaft 21 mounted on the main framework 11. For tape-printing, the top plate 12 is replaced by a top plate carrying a platen disc 24, Fig. 2a, secured to a slightly inclined shaft 25 which is mounted in a bracket on the top plate and has a bevel wheel 34 engaging a bevel wheel on a horizontal shaft mounted on the top plate, this shaft having a pinion for engaging the feedpinion 22. The tape passes through a guide and engages a feed-roller 28, preferably driven from the platen disc by gearing 29, 30. Letter-spacing mechanism; carriage-releasing arrangements; carriage-returning mechanism.- A ratchet-wheel 108, Fig. 5, on the feed-shaft 21 co-operates with a detent 109 and a letter-spacing pawl 107 pivoted on a slide 102 supported by a rocker 100 which is rocked at each operation by a cam on the cam shaft 59. In one setting of the permutation bars 42, none of the actuating- bars are selected but the cam shaft is operated to effect word-spacing. A cam plate 110 on being rocked engages pins on the detent 109 and pawl 107 and releases them from the ratchet-wheel 108, thereby permitting a spring-drum 112 to return the platen carriage 17. The cam plate is operated by means of the actuating-bar 40a which is arranged, on being selected by the permutation bars, to trip a latch and permit a spring-urged lever to actuate linkage connected to the cam plate. The spring-urged lever is automatically returned by means of an arm on the driving-bail 49, Fig. 1. The cam plate can be operated manually by a push-rod 124. During carriage-return, the cam plate is looked by a latch which is released at the next operation of the slide 102 by means of a pin 123 thereon. Line-spacing mechanism. - A ratchet-wheel 126, Fig. 6, on the shaft 15 of the platen roller co-operates with feeding and holding teeth on a dog 128 pivoted on an arm 130 rocking on a shaft 132 on the top plate 12, Fig. 1, a spring 131 holding the feeding-tooth engaged. The shaft has arms 133, 136, the arm 133 being connected by a spring 134 to the arm 133, and the arm 136 engaging a fork in a lever 137 which is mounted on the main framework 11 and is operated by the actuating-bar 40b. Locking-devices. - When any of the abovedescribed special actuating-bars 40a .. 40e, Fig. 5, are selected, a lever 159 is moved into the path of an arm 161 on the rocker 100 and provents operation of the letter-spacing mechanism.