US2112308A - Translating mechanism - Google Patents

Description

March 29,1938. R D, SALMON 2,112,308

TRANSLATING MECHANISM 7 Filed July 27, 1955 Patented Mar. 29, 1938 PATENT OFFiCE 2,112,308 TRAN SLATING MECHANISM Reginald Dennis Salmon,

signer to Creed and don, England Application July 27,

In Great Britain 2 Claims.

This invention relates to translating mechanism for printing, recording, registering and like apparatus and more particularly to mechanism for selecting individual characters from a bank of characters as a result of the movements of a number of members each moved according to an element of the code representing the character.

Devices of this kind are known in which the resultant motion of the character selecting mechanism is the aggregate of the motion caused by all the members, and in particular it is known to use a series of cords passing over pulleys, in such a way that the movement of each cord is transmitted in diiferent ratio to a typewheel. In this arrangement, however, each cord was movedby a separate magnet.

It is an object of the invention to provide means whereby the motion of each member shall be imparted in a positive and effective manner, and whereby the character selecting mechanism may be moved the required amount without undue magnification of movement, and in such a way that the moving parts are accelerated and brought to rest with a minimum of shock, so that the machine shall be as silent as possible in operation.

It is another object of the invention to provide a practical form of aggregate motion device, using the movement of belts passing over pulleys, that shall be compact and adapted to modern requirements in teleprinters and the like.

According to one feature of the invention I provide translating mechanism of the kind referred to in which the movement of a character selecting mechanism is the aggregate of a series of separate movements transferred from the movements of a plurality of members set in succession by the response of a single magnet to received signals by means of a corresponding series of belts and pulleys, each belt passing over a pulley and transferring its movement to the next belt and the movement of the last belt being transferred to the character selecting mechanism.

According to another feature of the invention I provide translating mechanism of the kind referred to in which the ends of a plurality of belts passing over pulleys are attached to members, each released for movement through a given distance by power driven means in accordance with the elements to be translated in such a manner that the movement of a character selecting mechanism is the aggregation of the movement given to all the belts.

The invention will be better understood from Croydon, England, as-

Company Limited, Grey- 1935, Serial No. 33,545

August 23, 1934 the following description taken in conjunction with the accompanying drawing in which Fig. 1 shows a side elevation of one unit of a translating mechanism according to the invention;

Fig. 2 is a plan view mechanism showing how and Fig. 3 shows one manner in which the translating mechanism may be actuated.

Referring to Figs. 1 and 2, a bar l is adapted by its movement to right or left to move a forked detent lever 22. In the translating mechanism as applied to selecting a character according to its representation on a five unit code, there will be five bars such as i, each actuating a forked detent lever such as 2. The five bars may be moved in various combinations by depressing a key of a keyboard. In a type printing receiver the five bars 5 may be moved in the same manner as the five notched combination bars or combs in type printing mechanism in which notches in such bars or combs are aligned to select a type lever for striking against the paper or for stopping a continuously rotating type wheel in printing position. Mechanism for setting such bars successively in accordance with the response of a single magnet to received signals is well known.

Each detent lever cooperates with a disc 3, 3 or 3 carrying a pin i, 4' or i". The disc tends to be driven through a friction clutch from a continuously rotating shaft but is prevented from moving by the detent lever in the position shown. When the bar I is moved to the right the disc 3 is released so as to move through half a revolution when it is again arrested. Subsequent movement of the bar I to the left would again release the disc 3 for a second half revolution.

To the pin 4 is attached one end of a belt 5 in the form of a steel tape which passes over a pulley 6. The other end of the steel tape is attached to a pin 1. On the same spindle as the pulley 6 is a grooved wheel it which slides in a slot in a fixed frame I2. The spindle of the grooved wheel ill and pulley t is fixed to a frame 8 to which is also fixed a second grooved wheel I i also sliding in the slot in the frame H2. The frame 8 is under the action of the belt 5 and a spring I3 is fixed at one end to the sliding frame 8 and at the other to the fixed frame I2. A rack 9 is fixed to the frame 8 and meshes with a gear wheel M on the spindle of which is fixed a type wheel Hi.

When the detent 2 is moved from the position of several units of the they are interconnected,

shown the crank pin 4 rotates through half a revolution and the pulley 6 and frame 8 move through half the throw of the pin 4. This movement is communicated to the type wheel I5, the gearing being such that the type wheel also makes half a revolution.

The belts 5' and 5" attached to crank pins 4' and 3" respectively pass over pulleys 6' and 6" and are attached to pins 1' and 1" respectively. The pin l to which belt 5 is attached is mounted on the frame 8 carrying the pulley 6'. The pin 7' to which the belt 5' is attached is mounted on the frame 8" carrying the pulley 6".

When crank pin 4 is given half a revolution, the frame 8' moves through the same distance as the diameter of disc 3, and pin 1 moves through half this distance. The frame 8 then moves through half the movement of pin 7 and type wheel i5 is given a quarter revolution. Thus there is a 2: 1 step down between the movement of a crank pin and the movement transmitted to the next unit.

By placing the pins 7, 1', etc. on moveable frames carrying the pulleys, these pins may be placed at such a distance to the left in Fig. 2 that a very compact structure results and the whole mechanism is contained within workable limits.

In the case of the five unit code there will be five units. Three only have been shown in Fig. 2 as these are suificient to show the construction of the apparatus. The first crank pin serves to move the type wheel through half a revolution, the second through a quarter and so on, the last one moving it through one thirty-second, or the space of one character.

Although a combination bar and forked detent has been shown in Fig. 1, other means of releasing the disc 3 for half a revolution may be used. One such means is illustrated in Fig. 3 which also shows another means of driving the disc The disc 3 is provided With a hub 3 which fits Within a hollow bearing I? carried on a fixed frame. On the bearing I7 is loosely carried a toothed wheel i8 attached to a gear wheel i3 continuously driven. A pawl 2| adapted to mesh with the toothed wheel I8 is pivoted on a pin 25? carried on the inner surface of the disc 3. The pawl 2| tends to be pressed into engagement with the toothed wheel l8 by a spring 22 fixed to the disc 3. In the position of the disc 3 shown the pawl 2| is held out of engagement with the wheel it by means of a two armed detent lever and when the pin 4 is at the opposite end of its diameter by a similar detent lever 24. The two levers 23 and 24 are pivoted on pins 25 and 23 and held in engagement with pawl 2| by a spring 27. The disc 3 is held in either of its two positions by a detent lever 28 pivoted on pin 25 and held in notch 30 or notch 3| in disc 3 by a spring 29.

If disc 3 be in position shown and the horizontal portion of lever 23 be depressed pawl 2| will be pressed into engagement with wheel I8 and the disc 3 will rotate therewith until lever 24 disengages pawl 2| and simultaneously lever 28 arrests disc 3 by falling into' notch 3|. The disc 3 will then be moved from its second position by actuation of detent lever 24.

The levers 23 and 24 may be selectively depressed according to the nature of the element of a character by moving an intermediate piece to left or right above the ends of their horizontal portions and striking this piece down for each character. In the case of telegraph receiving apparatus of the start stop type the intermediate piece may be struck downwards by a cam after all such pieces have been set by the elements of a received signal.

What is claimed is:

1. Translating mechanism comprising in combination a series of members, power driven means tending to move each of said members, detent means for releasing each of said members for a predetermined movement only, a belt, a pulley, and a frame carrying said pulley for each member, the belt passing over the pulley and having one end attached to the member and the other end attached to the frame, the other end of the last belt being attached to a fixed point, grooved wheels fixed to each frame and adapted to move in a slot in a fixed frame, an indicating member adapted for movement by one pulley, means for keeping each belt under tension, and means for operating said detent means in a combination representing a character to be translated.

2. Translating mechanism comprising in combination a series of discs tending to be continuously driven by common power driven means, detent means individual to each disc for holding said disc from rotation and when actuated allowing a rotation of half a revolution only, a crank pin on each disc, a metallic tape, a pulley and a frame carrying said pulley for each crank pin,

the metallic tape passing over the pulley and having one end attached. to the crank pinv and the other end to the frame of the next pulley, the other end of the last metallic tape being attached to a fixed point, an indicating member adapted for movement by one pulley, means for keeping each metallic tape under tension, and means for operating said detent means in a combination representing a character to be translated.

REGINALD DENNIS SALMON.

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