Patent GB-459646-A (GB)
Title: Improvements in or relating to typeprinting telegraphy
IPC: H04L25/42
Filed: 1936-06-09
Abstract: 459,646. Type - printing telegraphy. ESTOUP, J., 76, Rue CÚlina Dubois, Montrouge, Seine, France. June 9, 1936, No. 16061. Convention date, June 19, 1935. [Class 40 (iii)] In a start-stop system, printing of the outgoing character is effected mechanically and independently of the line currents by a selector bar mechanism which is set from the key-operated selector bar mechanism and which sets the contacts of an automatic sending key said contacts being connected to a rotary distributer. The outgoing signals are printed in red and the incoming in black. Means are provided (1) to indicate by touch when the character keys may be released, (2) for the automatic release of mechanism for transmitting an indication of the identity of a called station, and (3) for stopping the motor of the apparatus after a definite period has elapsed since the transmission or receipt of a signal. Line circuits. When the transmitting and receiving distributers 1, 2, Fig. 1, respectively are at rest the line is connected to the receiving relay 4 through the transmitting brushes 8, 9, holding it in the " rest position. When a character is transmitted the brushes 8, 9 are released for half a revolution and send to the line a negative start impulse, five code impulses of polarity dependent on the positions of the contacts a ... e of the switch 3, and a positive stop impulse. During transmission one of the brushes applies positive current to the relay 4 through contact 13 to hold it in the " rest " position to prevent the energization of the local " start " magnet 5. Upon reception of a negative start impulse the relay 4 operates to energize magnet 5 which releases the distributer 2 for one revolution during which the code impulses are distributed to the selector magnets 6a ... 6e. Motor circuit. The motor 18, Fig. 2, is energized through a mercury switch 19 mounted on a plate 20 which by a friction drive rotated to open the motor circuit after fort seconds unless restored by the magnet 21 through the closure of switches 22 or 23 which are operated during the transmission or reception respectively of each character. Transmitter-receiver. Depression of a key lever 25, Figs. 3 and 4, positions selector bars 27, those of which that are moved to the right actuate the armatures of the selector magnets 30 through levers 28 to allow the rotation of " switch levers 31. The selector bars 42 which select type-actuating bars 48 and position the contacts 45 of the automatic sending switch, are positioned by cam operated levers 39, 34, according to the positions of the levers 31. The levers 31 are restored by a cam-operated rod 54. Printing is effected by a universal bar 50, 51 which allows the selected bar 48 to drop and then moves it longitudinally to operate the type bar 53. When receiving the selector bars are set through the agency of the selector magnets 30. A special cam on the transmitting sleeve strikes the universal bar 35 to give a tactile indication to the operator to raise the finger. Clutch mechanisms. For rotating the transmitting distributer half a revolution the universal bar 35, Fig. 5, operates a lever 67 bearing rollers 70, 66 the roller 70 causing the engagement of the clutch members 63, 65, while the roller 66 is removed from one of two notches on the driven sleeve 62. After half a revolution the roller 66 drops into the other notch and disengages the clutch members 63, 65. The motor relay switch 72 is closed during the half rotation. The receiving distributer is rotated for one revolution by operation of the start magnet 86, Fig. 6, which through levers 85, 83 rocks a fork member 74 about its pivots 77, 78 to release a roller 75 from a notch in a fixed member 81, and couple the shaft 73 to the moving wheel 80 through clutch member 76. The roller 75 after three-quarters of a. revolution actuates a lever 90 to release the receiver cam shaft for one revolution and resets the levers 83, 85 before coming to rest in the notch in the member 81. During the revolution the switch 94 is closed to energize the motor relay. Answer back device. A special signal results in the engagement of a clutch which drives a shaft 95, Fig. 3, carrying fingers 96 which engage the key levers 25 in a prearranged succession to transmit an indication of the called station. Special keys are also provided for case shift, line spacing, carriage return back spacing and bell signal which operate known typewriter mechanisms, provision being made to prevent operation of the escapement mechanism by the universal bar when these signals are received.