Patent GB-191029297-A (GB)
Title: Improvements relating to Printing Telegraphs.
Inventor: MATHYS ALBERT WILLIAM
IPC: H04L17/00
Filed: 1910-12-16
Granted: 1911-12-14
Abstract: 29,297. Mathys, A. W., [Morkrum Co.]. Dec. 16. Electric type-wheel actions; case-shift mechanism.-In a type-printing telegraph system, a keyboard transmitter controls five contactsprings which send a combination of five positive and negative impulses to line for each letter &c. The impulses are sent consecutively by means of a series of relay contacts which are closed in order. At the receiving-station the impulses are distributed among five sets of relays. Four of these sets control perforated selecting-disks through which selecting-pins are protruded, and the fifth set determines the direction of movement of an arm which rotates until it meets a protruding pin, and thus positions the type-wheel. The type-wheel is provided with three rows of type, any one of which can be brought to the printing position by a proper combination of current impulses. The type-wheel H, Figs. 1 and 9, is mounted in a carriage J on a spindle h, which slides within and is keyed to a hollow shaft 124 connected by a universal joint 126 to a shaft 127. A fork 140 engages in a groove in a collar 136 connected to the spindle h by a pin 137, and is actuated by means of a pin 141 and a bent arm 143 from a collar 132 on a square shaft 129, so that rotation of the shaft 129 raises the collar 136 and the type-wheel in the vertical direction. The shaft 129 is connected by arms 145, 146, 147, a shaft h<1>, and arms h<2> to actuating-rods h<3> of magnets H<1>, H<2>. The energizing of these magnets is arranged to give different amounts of movement to the shaft 129 and thus to bring the second or third row of the type to the printing position. The shaft 127 is connected through bevel-gearing 135, 134 with a square shaft l, and a certain rotation of the shaft l is required to bring any letter in a row on the type - wheel opposite the platen. Four receiving-magnets N<1>, N<2>, N<3>, N<4>, Fig. 9, actuate four disks n<1>, n<2>, n<3>, n<4> through rods n<5>. These disks are each provided with series of perforations 179, Fig. 18, and with a slot 192, which by co-operation with a lug 193 limits the extent of rotation of the disk. When a magnet M<1> is energized, arms m<3>, m<4> move plates m<1> and pins m to the right in Fig. 9. For any combination of movements of the four disks, two of the pins m are able to protrude through a series of the holes in the disks, one on each side of the centre position. The shaft l is now rotated until an arm M comes in contact with a protruding stop m, when the desired letter on the type-wheel is opposite the platen. The shaft l is rotated through gearing l<1>, l<2>, Figs. 9 and 12, which is connected by a shaft l<3> and arms l<4> to the armatures l<5> of magnets L, L<1>. As the fifth impulse energizes one or other of these magnets according to its polarity, the shaft l is accordingly rotated in one or other direction. The shaft l is restored to normal position in the first place by springs 166, 167 acting on an extension of the shaft l<3>, but a more sensitive device is provided by two disks 171, 172 loosely mounted on the shaft l. A coiled spring 173 is connected to the hub of disk 171 and to a pin 174 on the disk 172. The spring holds the disks with lugs 175 against a fixed pin 176, and a pin 177 carried by the shaft l. When the shaft l is rotated, one of the disks 171, 172 is rotated by the pin 177 against the action of the spring 173. The shaft M is held in the centre position by a stop-pin 277, which is moved back to allow the rotation of the shaft by a pin 281 carried by the plates m<1>. The type-wheel is moved to strike the platen by an arm f, Fig. 1, which is actuated through connexions 212, 213 from a shaft 128, which is connected through arms p, p', p<2>, Figs. 1 and 9, to the armature p<3> of a magnet P, and is held in normal position by a spring. Alining for impression.-An alining-arm 217 is pivoted to a lug 218 on an arm j, and normally engages a fork 219. As the type-wheel moves forward, a pin on a lower extension of the arm engages in a cam-slot on the arm and moves the arm 217 into engagement with a toothed wheel 220, thus alining the type-wheel. Electric letter-spacing mechanism; carriagereleasing arrangements; carriage-returning mechanism.-The type-wheel carriage J, Figs. 1 and 9, is connected to a cord 236, which passes over pulleys 238, 239 and is wound on a drum 240. This drum is provided with two ratchetwheels 242, 243, Fig. 12, which are engaged by feeding and retaining pawls 244, 245. The pawl 244 is connected by an arm 248 to the armature of a letter-spacing magnet S, so that when this magnet is energized the pawl moves idly over a tooth of the ratchet-wheel, and when the armature is retracted the ratchet-wheel is fed forward one step. A carriage-return magnet S<2> moves the pawls 244, 245 from engagement with the ratchets by means of arms 262, 261, 259 and a pin 260. At the same time an arm 263 is raised from its groove in a shaft 265, and a spring moves the shaft to lock the armature S<3> in the attracted position until the carriage T returns under the action of a spring drum 256, whereupon the carriage strikes a collar 267 and returns the shaft 265 to its former position. To prevent over-running of the drum 240 on the return movement of the carriage, an arm 271 is normally held up by the cord wound on the drum, but when the cord is unwound, the arm comes into engagement with a pin 270 and holds the drum with the cord tight. Paper feeding and guiding arrangements; electric line-spacing mechanism.-The paper roll is mounted in slots 96, Fig. 1, and the paper passes between guides 114, 102, 109, 112 and the platen G, Figs. 1 and 9. The feed-rollers 98, 99 are mounted on arms 101 carried by spring arms 103, which can be depressed by means of a finger-piece 106 and rod 105 to throw off the feed-rollers. The mechanism comprises a ratchet-wheel g', Fig. 9, and normally-disengaged feed and stop pawls g<3>, g<2> on an arm of a rock-shaft 118 operated through another arm 120 from the armature of a magnet G<2>. The guide 97 is used for loose sheets. Roller inking-arrangements.-An inking-roller 227, Fig. 1, is carried by a bent spring 229 on an arm 225 which is pivoted at 226 to an arm 224. As the type-wheel moves forward, it presses up the inking-roller, a pin 231 on the arm 224 being guided in a slot 230 in the arm 225.