US2375587A - Transmitting system - Google Patents

Description

May 8, 1945.

. L. S. ROSE TRANSMITTING SYSTEM Filed June 26, 19 42 I INVENTOR. Luther 5. RD 5 E ATTORNEYS.

telegraphy,

Patented May 8, 1945 UNITED STATES This invention relates to: improvements in transmitting device adapted forv use in connection with printing telegraph receivers and the like l The primary object of i thisinven'tionl is the provision of an improved transmitterfor transmitting code signals to a printingtelegraph receiver such as set forth in my co -pending application Serial Number 408,886, filed iAugustZQ, 1941, now Patent No. 2,323,155 grantedJune 29, 1943; i

A further object of this inventiontis the pro vision of improved means whereby written messages may be converted into dots and dashes by means of a conventional typewriter, resulting in l the transmission of long andshort'electrical imor t ro n in. l y

In its brqad. ,aspect, actuationoi, a key of the pulses to a standard .radio transmitter or the like. A, further object of this inventionis theprovision of improved means for the transmission in code of messages from a conventional typewriter havingletters of the alphabet delineated thereon; the code transmission being of the variable long and short impulse type, andwhich transmission is entirely automatic, so that the operator of the typewriter need notbewfamiliar with code transmission systems, etc. l

'Other objects and advantages of this invention will be apparent during..the course of. the following detailed description. y i i In the accompanying drawing, forming a part of this specification, and wherein similar reference characters designate corresponding parts thruout the several views! R Figure 1 is a wiring diagram showingthe pre ferred form of means for translating letters of the alphabet into transmitter actuating long and short electrical impulses. l

Figure 2 is a diagrammaticview showing th actuating features of the details ShOWIliIlFigure 1. l i

In the drawing, wherein for the purposepf illustration is shown a preferred: embodiment of the invention, the letter A may generally desig nate a standard typewriter having means B assofireferablytconstantt motor I l. [Upon the shaft Ill there are positioned rotor discs or'members I2 individual to,theykeys of thetypewriter,

' and which are proyided with contact points correspondingjto longand short. impulses. .Detent means D is provided, electromagnetically controlled, for controlling the stoppage and starting .typewriter will close a, circuit included in the means 13 for causing; the rotor ID to turn one complete revolution Depending, upon the particular key which is pressed, a; circuit will be completed thru theaparticular rotor disc, or member l2 correspondin gto that key, and the circuit will, be: sefoontrolled Ithru .the cdetent means I) as; topermitthejshaft II] to completeone revolution. The circuit which is'olosedby reason of switch engagement With the piarticularrotor disc or mernber lZ "whic'li'is actuated upon pressing its respective key, will permit variable impulses to betransm'itted to theykeying relay C, and

thence my the radio 'or other type of, trans.- l'nittelE,

Asuitable clutchmeans 2o, diagrammatically showninthe drawing, is employed to drive the shaftlflfrom the motor Il.. K" i In order to understand operation ofthe various electro magnetically controlled circuits and relays, a complete cycle'for the transmission of the code corresponding to the letter F will be described in detail. The typewriter A is, of course, providedwith the usual keys 2'5, pivoted at 26. Assuming the key 25shown'in the drawing will operate the mechanism .for printing letter -f. -In Morse code the letter F consists of two dots, a dash andasingledot. l

Pressing of the key 25 will cause the same to engage a switcharm 30, moving, thelatter into engagement with acontactsl. for closing a circuit 32. This circuit. 32 may include a battery 33 as a source of electrical energy. .The battery ciated therewithfor directing short and long electrical code impulses to a transmitter operating keying relay C.

It is to beunderstood that the transmitter of this invention is not to be restrictedto code transmission of messages by means of radio, but is equally adaptable for use in connection with wire The means- B generally consists of a rotor ID, in the nature of a shaft, actuated by means of a 33 isgrounded at 34 and the circuit 32 includes a switch arm 36 normally disengaged from its contact 31 by means of a cam 38 keyed upon the shaft I 0. 1

Operation of the key 25 will operate a switch 40 for closing an auxiliary circuit 4| which. in-

eludes the source of electrical energy 33. f The closing of. this circuit 4! operates an electromagnetically controlled relay 43. The latter has; an armature 44 normally spring actuated, to an It is pivoted at 41 and at opposite sides of the pivot it is provided with detents 49 and 50 adapted to be alternately operated into the path of a stop lug or member 55 positioned upon some portion of the rotor 10, such as the cam disc 38. During inaction of the circuit 4| the detent 50 is interposed in the path of the lug 55 to limit rotation of the rotor 10, as shown in Figure l, and as shown in Figure 2 when the relay 43 is energized, the armaturewill interpose the detent 49 in the path of the lug or tooth 55.

As before mentioned, when the key 25 is a pressed, closing of the switch 40 will actuate the;

relay 43 disposed in the circuit 4|. The rotor 7 l moves in the direction indicated by-the-arrow in Figures 1 and 2 and attraction of the arma ture 44 will move the detent 50 out of position of the stop 55 so that the rotor lfl will be placed in operation. Since the typewriter key-Z 5 ;a1so

closes the switch 30-31, current will pass from the battery 33 thru the relay 43; thence thru-the closed switch '40 and thence thru the switch 30-3! and thru the circuit 32 to a brush fill-"operating upon the rotor disc or member l2. This rotor disc I2 is providedu'pon its peripher-y or, some other location "thereon-{with an insulated surface in which appear conductors 6| of varying length corresponding to dots and dashes. These conductor segments transmit the current along the shaftto a suitable brush arm 65"and into the keying relay q andth'ence to ground 61. Energizing of the relay C attracts an armature "I0 normally pivoted at H and spring actuated at 12 so that it is normally open. Attraction of the armature Hi will close a circuit 15 which operates the operator of the typewriter may release the key as soon as it has been pressed sufficiently to. close the switch 40 and switch3fl-3l.

Should the operator release the keytoo quickly, it is to-be noted that part'of the circuit will operate arelay 80 for holding the armature in engagement with its contact point 3| and thus holding the switch 3fl--3l-closed once contact has been made. This armature'30 'is; of course, spring actuated to normally hold; the switch 303| open. After this has-beenaccomplished the switch 303I will remain closed until the current has been interrupted somewherenbetween this point andthe battery,.33. .If the typewriter key has been released too quickly and the switch 40 opened prematurely, the switch 36%31'. will automatically maintain the circuit closedluntil the cam 38 advances to automatically'open the circuit.

It is immaterial within reason how slow or fast the typewriter keys are-operated, 'the'rotor l0 will only make one complete revolution each time a'typewriter key is pressed.

, If the typewriter key 25 should be held down for too long a period of time, the switch 40 will of course be closed. The cam 38 will open the switch 3631, but since the currentis flowing to electro-magnetic relay 43, the armature 44 will remain in theposition shown in Figure 2 of the drawing and the detent or dog 49 will automatically stop rotor 10 at the completion of one revolution thru engagement with the stop 55, until the cam 38 breaks the circuit. This, of course, will permit the armature 44 to return to its normal position, shown in Figure l, with the detent 5|) against the stop 55.

In Figure 1 the difierent rotor members 12 of course, are properly provided with segments corresponding tothe code of the respective key letter to which they relate, and of course each key. :of=.-the typewriter operates its pair of switches in the same manner as above described for the key 25.

. Itlis, to .be understood that the transmitting thermore; the typewriter A- can be equipped with electric-magnetic means to print amessage upon the typewriter as operated by a transmitter such ,as hereindescribed; such transmitter, of course,

being located remotely. In such case the typewriter will, of course, have to be equipped with the receiving apparatus of my above described co-pending application. It is also to be under-- stood that various'other changes in .the arrangementrof circuits and parts may. be madeto the invention'as herein shown, without departing from the spirit of the invention or the scope of theclaimj v I claim: In code' transmitting apparatus for printing telegraph receivers and the 1ike,.the combination of 'a mechanically actuated devicelhaving, a plurality of keys movably mounted thereon with 'di'ife'rer'it characterdesignations therefor, rotary means jinclu'dinga rotor Vmember for. each key provided with a particular. current conducting contactarrangement, thereon for the respective character of the key, all of said members being keyed for unitary rotation at all times with the rotary means, circuit means controlled by key actuation for respectively directinga. circuit thru the contact arrangements of the particular rotor member whose key is moved for message transmission purposes, means actuated by closin'g'of a. circuit thru the contacts of a rotary member for transmitting electrical impulses to 'a"trans' mitter in accordance with the connectorv contact arrangement of therotarymember, detent means forregulating the rotary actionof said, rotor as a unit in accordance with proper key actuation, and electro-magnetically controlled means for regulating the proper action-of said detent

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