Patent GB-361017-A (GB)
Title: Improvements in and relating to typewriters, calculating type machines, high speed telegraph machines, type-printing telegraphs, and the like
IPC: G09C3/00
Filed: 1930-09-01
Abstract: 361,017. Co ding- machines &c. MERCEDES BœROMA SCHINEN - WERKE AKT.-GES., Benshausen, Post, Mehlis, Zella, Thuringia, Germany, PEROTI, P., 161, Norwood Road, London, and HINRICHS, H., 21, Kleine Reichenstrasse, Christianshof, Hamburg, Germany. Sept. 1, 1930, No. 26044. Convention date, Feb. 1. [Class 100 (iv).] Relay type-lever actions ; key interlocks.-In a typewriter, calculating type ma, chine, high speed telegraphtype-printing telegraph, or the like a device is provided for selecting automatically the control signs for the code words. Each code word comprises a given number of letters, the last of which acts as a control letter, and the device is so constructed that, if the code word is incorrectly typed, the machine is locked against further use. The machine comprises a frame 1, Figs. 2 to 5, carrying a paper carriage 2, type keys 3, and space-bar 4. The machine is driven from an electric motor 5 through worm gearing S and shaft 6. Each key lever 8 is provided with a pivoted hook 11, Figs. 2 and 6, engaging a projection on a bar 16 pivoted to a lever 18. On depression of a key, the corresponding bar 16 is drawn into engagement with a tooth on the shaft 6 and moved thereby in the direction of the arrow 25, so causing the lever 18 to turn on a pivot 21 and actuate the type lever 23. The bar 16 is released from the shaft 6 by a bar 20a and returns to normal position under the influence of a spring 19. The key lever 8 is maintained in depressed position by a projection 61 on a lever 59 engaging under a fixed bar 62, and in this position, a projection 257 on the lever 8 enters between two of a series of rollers in a cage. The size of the cage and rollers is such that only one projection 257 can enter, so that a second key cannot be operated until the first has returned to normal position. The lower end of each lever 18 is forked and engages a pin on a corresponding lever 33 pivoted in a slot in a carrier 29. Pivoted on the lever 33 is a lever 36, Fig. 2a, limited in its movement by the engagement in a slot 36b therein of a projection 40 on the lever 33. The lever 36 is also formed with a cam surface 41 adapted to engage at a certain point in its movement with a common bar 42. Also pivoted to the lever 33 is a second lever 38 the position of which is maintained by a projection engaging under the horizontal arm of the lever 33, by a spring acting between the levers 36, 38, and by a projection 38c engaging a notch 36c on the lever 36. Oscillation of the lever 33 causes the offset end of the lever 38 to engage a plunger 70, Fig. 2, connected to the end of a Bowden control wire 71. When the surface 41 engages the rod 42, the projection 38c and notch 36c are disengaged and the end of the lever 38 is allowed to release the plunger 70. The lever 38 in its initial movement also engages a bridge 47 connected to two levers 46 one of which acts, through connections 48, 50, 53, 52 on a bar 56, Figs. 3 and 7, causing it to move in the direction of the arrow 56a. The bar 56 is formed with a cam 149 which acts on a lever 141 to disconnect a coupling member 138, Fig. 4, non-rotatably mounted on a shaft 133, from a complementary member 137 attached to a gear wheel 132 driven continuously from the shaft 6. A spring 146 acts against the end of the shaft 133 and constitutes a brake. A pinion 145 on the shaft 133 co-operates with bolts 126 on a disc 116 carried on a shaft 115 held against axial displacement in a part 114 and a wall 117. The part 114 is provided with a series of circumferentially - arranged spring-pressed pins 122 corresponding in number to the number of code letters or signs employed. The pins are controlled by the Bowden wires 71, and actuation of any key results in the projection of the corresponding pin 122 to displace a bolt 126. The bolts, arranged circumferentially in the disc 116 are held in normal or displaced position by the engagement of a spring-pressed ball 129 in one of two grooves therein and in normal position engage with the pinion 145. A spring 120 on the shaft 115 acts as a brake on the disc 116 to stop its rotation when a displaced bolt is in position adjacent the pinion 145. A pinion 119 on the shaft 115, Fig. 5, acts through gearing 198, 199, 201, 202, 204, 205, 206, 207, or 198, 202, 201, 199, 205, 206, 207 to drive a shaft 208 in clockwise or anticlockwise direction. The gear wheels 198, 204, 205, 206 are mounted on the wall 117, but the gear wheels 199, 201, 202 are carried by a rocker 1'75, Figs. 5 and 7, pivoted on the wall 117. The movement of the bar 56 in the direction of the arrow 56a results in the rotation of an axle 150 through a lever 148, and a lever 156 on the axle raises a slide 162 on a T-shaped guide 161. The slide is connected by a pin 178 to a fork 174 and a bar 177, and a pin 171 on the slide passes through slots in the fork and bar. On initial movement of the slide, a projection on the bar 177 raises a lever 176 pivoted to the wall 117, and removes a projection on the lever from a notch 175a on the rocker. As the fork moves upward, a pin 182 thereon slides on the side of the rocker and produces a rotation of the fork about the pin 178 until the pin 182 engages a recess 175c on the rocker. Further movement of the fork causes the rocker to turn about its pivot 183. A cam 196 on the bar 177 is then engaged by a fixed pin 193 to cause the lever 176 to be released and the spring 192 rocks the lever to cause its projection to engage the notch 175b on the rocker and retain it in its adjusted position. Projections 187, 188 on the rocker prevent it from turning too far. A pin 181 on the fork is thus brought into position for engaging the rocker on the next actuation, the fork being held in either of its extreme positions by a spring 172. The movement of the rocker results in the reversal of the direction of drive of the shaft 208 at each actuation of a key. The actuation of a key results in the projection of one of the bolts 126, and on the return of the key the shaft 133 is coupled to the shaft 6. The pinion 145 thereby rotates the disc 116 until the projected pin comes into position opposite the pinion when the disc is stopped. The shaft 208 is therefore rotated a corresponding distance in one direction or the other according to the setting of the rocker 175. A cam 151 on the lever 148 is adapted to engage a lever 153 and reset in normal position the pin 126 projected by the previous operation. The oscillation of the axle 150 also rocks a lever 225, Figs. 3, 4, and 7, connected to a bar 223 guided on a pin 228 and provided with a projection engaging notches in a disc 216 carried by a pin 213 in the machine frame. On the rotation of the disc 116, the projected pin 126 just before it comes adjacent the pinion 145 engages a lever 232, Fig. 5, connected to an axle 64 on which are mounted levers 66, Figs. 2 and 6, connected by a bar 67. When the axle 64 is rocked, the bar 67 engages the end of the lever 59 of the depressed key, and releases the projection 61 from the bar 62, so that the key lever 8 is returned under the action of its spring 8b. The signs employed n the code have each a special numerical value, and if alternate values of the signs in any code word of prearranged number, e.g. five, of signs, are represented as being of opposite characteristics, the numerical result should be zero. Thus the last sign of the code word acts as a check as to whether the word is correctly spelt. The rotation of the shaft 208 is communicated through bevel wheels 201, 211, to a disc 212, Figs. 3 and 4, bearing two series of letters arranged in reverse order according to the numerical values assigned to them. The disc 212 underlies the disc 216 which is formed with two series of apertures overlying the two rows of letters on the disc 212, the apertures in the two rows being staggered relatively to one another and being in number equal to the number of teeth on the disc 216. Between the apertures in one row is a + sign and between the apertures in the other row a - sign. An observation aperture S<1> in the machine frame always displays either a + or - sign on the disc 216 and a letter of one of the two series on the disc 212, the letter being visible through an aperture in the disc 216. When all but the last of the signs of a code word have been typed on the machine, the sign visible in the aperture S<1> should be the last sign of the code word. When the word is completed, the aperture S<1> should show the letter O together with the sign indicating the direction of movement of the disc 212 on the next operation. If the word has been correctly typed, a projection 214, Fig. 6, on the disc 212 will have engaged a lever 94 and displaced a rod 93 out of the path of movement of a projection 4x on one of the levers 4b carrying the space-bar 4. The other space-bar lever is connected by a pin and slot to a lever constructed in the same way as the key-levers 8. If the word has been correctly typed, depression of the spacebar will result in the normal movement of the paper carriage. If an error has been made, the rod 93 will project under the projection 4x, and actuation of the space-bar will cause the projection 4x to displace the rod 93 slightly together with a lever 88. The end 88a of the lever enters the locking- mechanism and locks all the keys. Further depression of the space-bar is impossible and the lever 88 is held in slightly depressed position by a lever 99 engaging a projection 97 on the lever 88. An extension 104 of the lever 88 carries a roller 105 adapted to engage in the depressed position with a spring strip 107 constituting one member of a switch controlling the circuit of a signal lamp 112. For purposes of correction the lock is released by a key 103 connected to the lever 99. A " clear sign " key is provided which is connected to a lever constructed similarly to the levers 8 and is adapted, if the code word has been correctly typed,