Патент USA US2116649код для вставки
May“), 1938- G. w. WATSON ‘ 2,116,649 COMMUNICATION SYSTEM Filed Jan. 16, 1935 69*?"ML yah/LLVENEOR. I BY WA ' ATTORNEYS. Patented May 10, 1938 UNITED STATES PATENT QFFIWE 2,116,649 COMIVIUNICATION SYSTEM Glenn W. Watson, Binghamton, N. Y., assignor to International Business Machines Corpora tion, New York, N. Y., a corporation of New York Application January 16, 1935, Serial No. 2,062 3 Ulalms. (Cl. 178—35) The principal object of the present invention ' The present invention relates to a communica tion system and more particularly to printing is to provide an improved method and apparatus telegraph systems applicable to radio and line for the transmission of intelligence. Further and other objects of the present inven transmission. tion will hereinafter become apparent in the ac-_ The invention embodies the use oi synchro nized disks or distributors at the transmitting companying speci?cation and claims and shown and receiving stations for completing the trans mitting and receiving circuits respectively, simi lar to the synchronization system disclosed in the application Serial No. 684,362, ?led August 9, 1933. Heretofore, similar systems employed means for transmitting independent and different character impulses to activate the receiving cir cuits for each character to be transmitted and 15 recorded. ' ‘ In the present invention, a'continuous or pro longed impulse is employed and transmitted dur ing the intervals transmission of characters is not occurring, so that when used in conjunction with the aforementioned synchronized disks, the 20 characters at the receiver are recorded which , correspond to the transmitted characters by dis continuing the continuous impulse or causing a. void impulse at the proper moment in the con tinuous ‘cycle to represent tne particular charac in the drawing which by way of illustration is what is now considered to be the best mode in which it. has been contemplated applying that principle. @ther embodiments of the invention 10 employing the same or equivalent principle may be used and structural changes made as desired by those skilled in the art without departing from the'present invention and within the spirit of the appended claims. 15 One form of the invention is fully disclosed in the following description and in the accompany ing drawing which shows a diagrammatic view of the apparatus. ' Referring now to the drawing, the transmitting and receiving units include a conventional or modi?ed typewriter having a series of lettered and numbered pivoted key bars I. 0ver the bars is mounted a roll 2 held in a slidable carriage (not shown) in the usual manner so that it is moved one space on depression of any key bar. ter to be transmitted. The present invention will be explained in con junction with a single impulse system, in which the diiferent characters to be transmitted are Each key bar has associated therewith a type bar 3 adapted to strike against the roll 2 on depres represented by single impulses which are de?nite 30 ly allocated during timed intervals to control the transmitter accordingly. Broadly, the system involves the shifting of the character impulse along the axis of a timed scale, the position of the impulse thereon determining the character to be sending distributor 6 carries a series of spaced contacts 6 corresponding respectively to the vari selected. ' The single impulses originated representing the characters are adapted to discontinue a contin uous or prolonged impulse radiated by the trans 40 mltter of the system at the corresponding time the particular pulses are initiated. The continu ous impulse transmitted is adapted to maintain the receiver inoperative, by way of example, one form of which is shown as a photo cell circuit that 45 remains activated by a light source energized by the continuous impulses. ' The'discontinuance of sion ‘of the corresponding key bar. 7 This action. is effected through a suitable linkage 4, between each key bar and its corresponding type bar. A ous characters on the type bars i. The con- ' tacts are engaged in rather rapid succession by‘ a 85 rotary contact arm ‘I driven by “a motor 8, which is in synchronism with the similar device at the other end of the transmission circuit and which is fully described in the prior application stated _ hereinbef ore. - Each of the key bars I is comprised in a branch condenser circuit embodying a common conduc tor I! in which is comprised a condenser charg ing battery l3. A line‘ i5 is extended from one side of the battery l3 and is branched separate 45 ly to a series of contacts l6 disposed respectively beneath the key bars I and normally spaced from the pulse at a particular timed period within a timed interval is adapted to energize the receiv " the latter when the bars are in their normal or ing unit at that period to record the particular raised position. The common conductor l2 ex tending from the other side of the battery 53 is 50 character. Numerous advantages are to be obtained from branched at" to each of the bars I, and in each a system of this type employing the disclosed of these branches is inserted a condenser l8. Thus, when any of the bars I is depressed, the principle, one of which is the reduction of natural or arti?cial interference usually present in sys corresponding branch condenser circuit will be 55 tems of this type. . ‘ 7 40 completed at the contact l6 engaged by the de 2 2,116,649 pressed bar, and the corresponding condenser it will be charged from the battery l3. The sending circuit embodies a conductor it joining the arm 1 from the condensers l8 and in cluding therein the relay 9. The other side of this circuit is branched by conductors 20 extend terminals are joined by a common conductor to the output of a suitable ampli?er represented by way of example by the thermionic tube with its anode connected to the said common conductor. The output of the receiver 30 has embodied therein a suitable light source such as a neon ing separately from the contacts 6 on the disk 5 tube 50 adapted to be energized by the trans to ?xed contacts 2| positioned over the key bars . mitted continuous l. The latter contacts are engaged by the cor 10 responding bars I when the latter are in raised or released position and at such time close a sending circuit consisting of the conductor i9, a corresponding condenser l8, contact 2i, con ductor 20, contact 6, and arm TI. The radio transmitter 22 has one of its output 15 terminals connected to an antenna 23 and its other output terminal 213 grounded in the usual manner. The input terminals are connected to or prolonged impulse im pressed on the receiver 30. The light source dur ing these periods of energization is directed upon and adapted to activate the photo cell 5| in a well known manner. The grid of the amplifier tube 618 is connected in a standard manner to the anode circuit of the photo cellv5l so that so long as the cell 5! is energized by the light source 50 the grid of the tube 68 is biased to a degree that the current in the ampli?er plate circuit is de creased so as to be ineffective to energize and the armature 25 of relay 9 and its contact it 20 which normally remain in engagement so that the input circuit of the transmitter remains closed during the timed intervals the relay 9 re mains deenergized and in this manner, the trans operate the solenoids 38 during the intervals the mitter 22 is adapted to radiate a continuous or and in turn the photo cell 5| becomes deener— prolonged impulse. gized tending to make the grid of the amplifier more positive with respect to the plate and in 25. In the operation of the device as thus far de scribed, it will be seen that the depression of a key bar l ?rst breaks the corresponding branch circuit at the contact 2i and closes one of the 30 branch condenser circuits to charge the corre sponding condenser it. On return of the key bar 5 into engagement with its contact M, the send ing circuit will be closed when the arm ‘i reaches the corresponding contact 6 on the disk 5. The closing of the sending circuit in this man 35 ner energizes and operates the relay 9 to open its normally closed contact l0 causing the trans mitter input circuit to be deenergized to ter minate the prolonged or continuous transmitted impulses at the particular point in the prede termined timed interval cycle to represent the particular character initiating the relay ener gizing or transmitter deenergizing'impulse, thus arm £12 engages the respective contacts ti. How ever, when a void impulse is transmitted and re» ceived, that is the discontinuance of the prolonged impulse, the light source 50 becomes deenergiz’ed crease the current ?ow in the plate circuit to the extent that upon the engagement of a particular contact ill at that moment by the contact arm :32 the corresponding solenoid embodied in the completed circuit is su?iciently energized to oper ate the said solenoid. Therefore it is seen that each time the pro longed or continuous impulse is discontinued the solenoid 38 included in the circuit completed by the contact arm‘?Z and contacts M is energized sut?ciently by the current ?ow from the ampli?er 48 to operate the said solenoid. The character corresponding to this contact M is printed on the roll 2 at the receiving station. These char acters printed will appear in the same order in which they are sent inasmuch as the arms ‘I and 132 are in synchronism and always in like rela creating a void impulse or timed interval during - tion to the contacts engaged thereby, and since 45 the continuous transmission of the continuous impulse. ~ A description of the receiving apparatus and its operation to effect the recording of a char acter corresponding to the character setting up 50 the void condition described will now be ex plained. I the discontinuance of the prolonged impulse it created only when the arm ‘I at the sending station engages the contact 6, corresponding to the key which has been depressed. It will be noticed that the receiving contacts at are of greater length circumferentially than the sending contacts 6. In fact, the latter are made The receiving circuit of the apparatus includes as short as possible in order that the initiated a receiver 30 having one of its input terminals grounded at at and its other input terminal con 55 nected to an antenna 32 and adapted to receive the prolonged or continuous impulse referred to and sent out from the antenna 23 in the usual impulse and created void impulse may be instan taneous. The longer receiving contacts 4H, how ever, hold the receiving circuit closed for an interval sui?cient to enable energization of the solenoids 38 and operation of the type bars 3, manner. Beneath each of the key bars 6 is a ' as well as allow for slight inaccuracies in the solenoid 38 adapted to operate on a plunger 39 in synchronism of the transmitting and 'receiving 60 the form of a ?nger depending from'the bar so _ arms ‘I and d2 respectively. While there has been shown and described and that when a given solenoid is energized by means presently to be described, the corresponding key pointed out the fundamental novel features of the invention as applied to a single modi?cation, bar will be depressed to actuate the correspond it will be understood that various omissions and ing type lever 3. The receiving circuit is gov 65 erned by a disk or distributor 40 carrying spaced substitutions and changes in the form and de tails of the device illustrated and in its operation contacts til corresponding in number and posi tion to the contacts 6 on the disk 5. A contact may be made by those skilled in the art without arm 62 rides over the contacts Q0 and is driven departing. from the spirit of the invention. It is by a mechanism such as a motor M and rotating the intention therefore to be limited only as in 70 in synchronism with the motor 8, in a manner dicated by the scope of the following claims. What is claimed is: similar to the described method in the said prior 1. A communication system of the character application. One terminal of each of the solenoids 38 is described comprising, in combination, means to separately connected ‘to one of the corresponding receive a continuous or prolonged impulse, the 75 contacts M by conductors t6, the other solenoid discontinuance of which at predetermined'timed 3 anacao intervals representing various character desig cording means controlled by said circuit and op nation signals, a light source controlled by said receivingmeans, a circuit including light sensi erated in accordance with the character signals tive means controlled by said light source so that upon discontinuance of the prolonged impulse a source of current energizes said circuit, and re 3. A communication system of the character described comprising, in combination, means to cording means controlled by said circuit and op erated in accordance with the character signals upon energization of said circuit. 2. A communication system of the character described comprising, in combination, means to receive a continuous or prolonged impulse, the discontinuance of which at predetermined timed intervals representing various character desig 15 nation signals, a light source energized by said receiving means during the transmission of ‘the prolonged impulse, a circuit including light sensi tive means controlled by said light source so that upon discontinuance of the prolonged impulse a 20 source of current energizes said circuit, and re upon energization of said circuit. , receive a continuous or prolonged impulse, the discontinuance of which at» predetermined timed intervals representing various character desig nation signals, a light source controlled by said receiving means, a circuit including light sensi 10 tive means controlled by said light source so that upon discontinuance of the prolonged impulse a source of current, energizes said circuit, means operating in synchronism with said character signals, a recording device controlled conjointly 15 by the last mentioned means and said circuit to operate the recording device in accordance with the character signals upon energization of said circuit. 20 GLENN W. WATSON.