Patent GB-114636-A (GB)
Title: Improvements in and relating to Telegraphic Printers.
Inventor: KLEINSCHMIDT EDWARD ERNST
IPC: H04L17/22
Filed: 1917-01-11
Abstract: 114,636. Kleinschmidt, E. E. Jan. 11, 1917. Electric type-lever machines.- In a telegraph printer, the typelevers and the platen-shift and line - spacing mechanisms are actuated by the selective operation of a series of hook bars by a universal operating bar. The hook bars rest on intermediate levers which are selectively operated, to raise the hookbars into the path of the operating bar, by means of a set of combination bars which are held in their normal position against the action of springs by the armatures of electromagnets, and which are re-set by the energization of a separate magnet in such a way that a new combination is set up while the letter of the previous combination is being printed. The carriage is operated for letter spacing by a electromagnet and retained in its operated position by a lever under the action of the electromagnet, while a second magnet is provided to accelerate the initial movement of the carriage when returning to its normal position. Type-lever actions.-Each type-lever 1, Figs. 1 and 5, is operated through a lever 3 and hook bar 4 by means of a universal bar 5 mounted on the armature 6 of the operating magnet 33. The hookbars 4 normally lie out of the path of the bar 5 and rest upon the inner ends of pivoted bars 8, Fig. 2, which normally bear against the underside of a universal restoring bar 10 by means of springs 11. Five combination bars 12, Figs. 1. 2 and 5, are placed under the front ends of the bars 8 and are normally pressed against latch pins 14 by springs 15. The latch pins 14 are mounted on the armatures of selecting magnets 19, Figs. 2 and 11, and are pressed into engagement with the bars 12 by springs 17. The bars 12 are restored to their normal positions by a lever 20 mounted on the armature 21 of a magnet 22. The universal restoring bar 10, Fig. 5, is mounted on a lever 23 connected to a rod 26 and operated on by a spring 24. The line wire 137, Fig. 11, which normally carries negative current is connected to the line relay C, the armature 140 of which normally rests in the position shown. When positive current impulses are received the relay C operates to connect the brush 29<2> of a rotary distributor, rotating in synchronism with a similar distributor at the transmitting end, to the negative terminal of a local battery D, thereby energizing a combination of the selecting magnets 19 as the brush 29<1> passes over the segments 1 to 5 of the distributor connected to these magnets. After the brush 29<1> passes over the contact segments 1 to 5 a brush 29' engages a contact segment 30 connected to a relay 31 thereby causing the contacts 31<1> to close the 'circuit of the operating magnet 33. The armature 6 is attracted, thereby raising the restoring bar 10 by the depression of the rod 26. The bars 8 are pressed against the bars 12 and one is drawn down into the slots of the bars 12 thereby raising its hook bar 4 into the path of the operating bar 5. When the armature 6 reaches its fully-attracted position, a screw 41, Figs. 1 and 11, on the bar 10 opens the locking circuit 35 of the relay 31 at the contacts 36 thus opening the circuit of the operating magnet 33 at the contacts 31'. One of the contacts 36 is mounted on a lever 37 which also carries a contact 39 which closes the circuit 138 of the combination-bar restoring magnet 22. The contacts 39 are locked in engagement bv a lever 42 which is released to open the contacts 39 and to close the contacts 36 when the armature 6 is moved to its fullyretracted position by the engagement of a screw 40 on the bar 5 with the lever 42. Platen-shift mechanism. -The platen 48, Figs. 1 and 3, is mounted on pivoted brackets 74 connected to a sub-frame 44<1> having a depending arm 44<2> carrying a roller 44<3> which rests on a bar 75. The bar 75 is carried by a bell-crank frame 76 the lower end of which is connected to a hook bar 77 resting on an intermediate bar 8<a> so that when the bar 8<a> is operated the bar 77 is raised into the path of the operating bar 5 and the bar 75 is lifted to raise the platen 48. The platen 48 is held in its raised position by means of a bell-crank lever 78, Figs. 1 and 5, connected to a bar 79 resting on an intermediate bar 8<b> which is operated to raise the bar 79 into the path of the operating bar 5. Letter-spacing mechanism.-The carriage 44, Figs. 1 and 4, is supported on bars 45, 75 upon which it is moved by a rack 49 gearing with a pinion 50 mounted fast on the shaft 51 carrying two ratchet wheels 52, 53. The wheel 52 is engaged by a pawl 56 mounted on a lever 57 operated by the plunger 58 of a spacing solenoid 59, Figs. 4 and 11. The solenoid 59 is energized by the closure of contacts 82, Figs. 1 and 11, each time a letter is printed, by a projection 1<1> on the type-lever engaging a universal bar 80, Figs. 1 and 3, mounted on a lever carrying one of the contacts 82. The pawl 56 is advanced against a spring 60 when the solenoid 59 is energized, and is operated to rotate the ratchet-wheel 52 by the spring 60 when the solenoid 59 is de-energized. The word-spacing signal control, a blank type-lever, which is brougnt to rest by a projection 83. Fig. 1, instead of striking the paper. Carriage-releasing arrangements; carriage-returning mechanism.-The carriage 44 is held in its operated position against the action of a spring drum 55, Fig. 4, by a pawl 61 engaging the wheel 52 from which it is released upon the energization of a solenoid 62, Figs. 4 and 11, the plunger of which is connected to a lever 64 carrying a pawl 66 and a projection 65. To return the carriage the solenoids 59 and 62 are simultaneously energized by the closure of a pair of contacts 90. Figs. 2 and 11, one of which is mounted on a bell-crank lever 91 resting on an intermediate bar 8<d>. The lever 91 carries a pin 92 which is engaged bv a locking-member 93 when the lever 91 is raised, thereby holding the circuit of the solenoids 59, 62 closed. The locking-member 93 is mounted on a shaft 93<1> carrying a finger 94, Fig. 4, which projects into the path of a pin 95 on the spring drum 55, thereby releasing the locking-member 93 from the pin 92 when the carriage returns to its normal position. The initial movement of the carriage during its return is accelerated by the action of the solenoid 62, the pawl 66 of which engages the ratchet-wheel 53 when the solenoid is energized. The operating pawl 56 and the retaining pawl 61 are moved out of operative relation with the wheel 52 by their inclined rear parts engaging adjustable stops 56<1>, 66<1>. Line-spacing mechanism.-The paper is advanced a line space by means of a solenoid 67'. Figs. 1, 7 and 11, the plunger 68 of which is secured to a lever 69 bearing against a slide 70. The slide 70 carries a feed-pawl 72 which is normallv held out of engagement with the ratchetwheel 73 by a spring 71 but upon the energization of the solenoid 67<1> the pawl 72 engages the wheel 73 to advance the paper. The solenoid 67<1> is controlled by contacts 84, Figs. 6 and 11, the closure of which is controlled by an intermediate bar 8<c>, a blank type-lever 86 and levers 89, 87. The lever 87 carries a pin 88 engaging a member carrying one of the contacts 84.