Patent GB-656031-A (GB)
Title: Improvements in or relating to keyboard controlled telegraph apparatus
Inventor: SALMON REGINALD DENNIS
IPC: H04L17/06
Filed: 1948-10-08
Abstract: 656,031. Type-printing telegraphy. CREED & CO., Ltd. Oct. 8, 1948, No. 26284. [Class 40 (iii)] Keyboard - controlled telegraph apparatus comprises key levers which control code-bars which are locked by means operated directly by any key lever which also initiates the rotation of a cam sleeve operating to transfer the settings of the code bars to storage members, to unlock the code bars after the transfer and to prepare for the subsequent arrest of the cam sleeve and means for reading the storage members for subsequent utilization of the stored combination. On the depression of any character key lever, such as 1, a universal bar 4 is moved to the left, rocking a bell-crank 6 which raises an arm 8 formed with a shoulder 14 supporting an extension 10 of a pivoted lever 11 having a lug 15 disposed underneath a corresponding lug 16 of a pivoted lever 17 coupled to the lever 11 by a spring 18. The raising of the lever 11 lifts the lever 17 so that a lug 23 is moved out of blocking position with relation to a lug 22 on an arm of a frame 19 which under the action of a spring 21 rotates a bell-crank lever 25 to release a pawl 27 carried on a pin 29 fixed to the cam sleeve 30 to engage a ratchet 28 on a constantly-rotating shaft. The selective movement of the five code bars, of which two only, 2, 3, are shown, rotates lever members 31 coupled to rockable members 33 each provided with two upwardly-disposed extensions 35 and a horizontal extension 36 terminating in a knifeedge portion which engages either above or below the knife-edges of the extensions 36 of the members 33 and through the bell-cranks 31 serves to lock the keyboard. A frame 40 pivoted on an axis 12 carries five pivoted storage members 38 with bifurcated lower ends engaging three-armed pivoted members 41 whose horizontal arms coact with the upward extensions 35 of the members 33. Shortly after the commencement of rotation of the camshaft 30 a cam 47 rocks the frame 40 downwardly so that the lateral extensions of the members 41 selectively engage the upward extensions 35 of the members 33 to rock correspondingly the storage members 38. Shortly afterwards a cam 48 engages a pivoted lever 49 which rocks the arm 8 in a clockwise direction with the result that the lever 11 is able to fall even if the key lever 1 has not been released so that the arm 8 is still in its raised position. Shortly afterwards a turned over projection on a lever 51 rocked by the cam engages a lug 53 on the lower portion of the frame 19 which is rocked counter-clockwise, is latched by the fall of the lever 17, and moves the pivoted bellcrank lever 25 to the position in which it disengages driving pawl 25 from the ratchet 28. The selective setting of the storage members 38 is transferred to a contact-operating member 86 by means of pivoted three-armed levers such as 54, 55 having horizontal arms 60, 61 with projections engaging sequentially spaced recesses in cams 64, 65 and vertical arms 56, 57 engaging a bus-bar 70 carried by the brackets 71, 72 of a pivoted frame, the recesses allowing the arms 60, 61 to rotate the frame except when their extended tail portions are blocked by the position of the associated storage members 38. The bracket 72 carries a pivoted leaf-member 75 terminating in an upwardly-extending portion with a knife-edge 77 arranged to engage one or the other surface of a knife-edge 85 formed at the lower end of the contactmember 86. The leaf-member 75 is supported between prongs 78, 79 carried by a frame 8 rocked seven times during each revolution of a cam 84 on the shaft 30-the arrangement being that the blade is moved downwardly immediately before the action of a lever, such as 54 or 55, on the bar 70 and is returned with a sudden movement so that the engagement with the knife-edge moves the member when necessary. At the end of a revolution a projection on a lever 67 lies in a recess in a cam 69, and the member 86 is retained against the marking contact 89 for the transmission of the stop element. When the cam-shaft 30 commences its rotation, the lever 67 is rotated counterclockwise and the bar 70 follows when blade 77 is moved downward by cam 84 so that when the leaf 75 is returned upwardly, it engages the inner lower surface of the member 86 which snaps over to the spacing contact 88. A " run out " key 93, allowing the same character to be repeated as long as the key is held depressed, engages a bar 94 which, through a bell-crank 96, raises an arm 97 having a shoulder 98 supporting the extension 10 so that levers 11, 17 are raised and frame 19 is rocked to allow the rotation of the shaft 30 as long as the key is held downthe cam 48 being ineffective to return the levers 11, 17 to control the frame 19 and thereby the ratchet clutch 28. Specifications 388,785, 442,662, 514,575 and U.S.A. Specification 1,902,943 are referred to.