US2206665A - Communication system - Google Patents

Description

3 Sheets-Shee't 1 VENTO?.

' ATTORNEYS.

July 2, 1940. c. R. Dorv COMMUNICATION SYSTEM Filed Nov.v 28, 1936 July 2, 1940. c. R, DoTY COMMUNICATION SYSTEM Filed Nov. 28, 195e 3 Sheets-Sheet 2 IN VEN TOR.

A TTORNEYS.

July 2, 1940. c. R. DoTY COMMUNICATION SYSTEM 3 Sheets-Sheet 3 Filed'Nov. 28, 1936 INVENTOR.

mata@ ATTORNEYS.

Psanadiuly ,2, 1940 PATENT OFFICE 2,206,665 COMM'UNICATIQN SYSTEM Charles R. Doty, Binghamton, N. Y., assigner to International Business Machines Corporation,

.New York, N. Y.,

a corporation of New York mnotion November 28, 1936, Serial No. 113,102

8Claims.

Another object of the present invention is the Y provision oi' individual rotary control means, ln place of theusual transmitting contacts associated with and controlledby the corresponding key bars. i

Another object of the present invention is the provision of control means at the receiver conditioned by the ilrst group of impulses to be operated at a later time in the operating cycle, and a second control means adapted to be conditioned by the second group oi. impulses and effective later in the timed cycle to effect selec- 25 tion of a single character circuit.

Still another object of the invention is the provision of means to provide overlap, whereby the first said-control means may be conditioned by a second character signal while the second said control means Iis effective -to select the circuit corresponding to the iirst character signal.

Still another object is a novel synchronizing device to establish phase correspondence.

Various other objects and advantages of the invention will be obvious from the following particular description of one form of mechanism embodying theinvention or from an inspection of the accompanying drawings; and the invention also constitutes certain new and useful features of construction and combination of parts hereinafter set forth and claimed.

In the drawings:

Fig. 1 shows, in part, one type and receiving control unit.

Figs. 2 and 3 show the transmitting and receiving rotary control devices.

Fig. 4 is a circuit diagram for the transmitting station.

Fig. 5 is a circuit diagram for the receiving station.

of transmitting Referring to the drawings and in particular to Fig. l, one form of a translating unit, such as the Electromatic typewriter, which may be used in the present system, will now be described 55 brieiiy. In the embodiment illustrated in the drawings, well known means are provided for actuating the type bars (not shown) by power operated devices comprising a power driven roller IU.

A cam II is pivoted on one arm of a bell crank lever I2 pivoted in the frame, the other arm of which is operatively connected with one arm of a bell crank lever I3 by means oilink I4. The other arm of lever I3 is connected to the type bars (not shown) in a well known" manner.

The lever I2 is actuated by the cam Il when the latter engages the driven roller I0 to be operated thereby. The engagement of the cam Il with the power roller is controlled by means of the key lever Il in 'a manner which willnow be described.

'I'he cam II is resilientlysengaged by a springpressed arm 20. which tends tovturn it into engagement with the power driven roller or stop 2| on a lever 22 pivoted on the bell crank I2 and normally arranged in the path of a lug on the cam. When the lever 22 swings to move its stop out of the path of the lug, the arm swings the cam into engagement with the power roller to be actuated thereby to swing the b'ell crank I2 to actuate its connected mechanism.

The lever 22 has an arm 24 which is provided with an oilset projection 25 at its end which projects laterally through an opening in the bell crank I2 and engages the bifurcated lower end 26 of an arm 21 of a key lever I'i pivoted on the common rod 28.

It is obvious then that depression of a key lever I1 releases the revolubly 'mounted cam Il to engage and be actuated by power roller lli in turn operating bell crank I2 and its attached links to cause the associated mechanism, such as the key bars and other operating mechanisms, to be operated. n Y

Attached to the key lever il is a connecting link I9 extending to a solenoid IB disposed beneath the keyboard, sothat upon energization of the said solenoid the connected key lever is de- Y pressed to operate the connected mechanism in the manner just explained.

In addition to actuating the several type bars and connected mechanisms, the revolubly mounted cams are adapted to open and close circuits which may be employed in the transmitting units. Upon release of the cam I I the arm 30 is engaged thereby and displaced to the extent that the stop 3| attached thereto releases the dog 32, by releasing members and 46. The arm 30 is latched in the said displaced position momentarily by means of the latch member 33. This eective to displace' the arm 35 to releaseths said dog for the predetermined timed required.

Dog 32 is pivotally 35 which is attached part of commutator or disk mounted et u nn as (Fig. 2), seid ask rotatably-mounted on the shaft 31 which is rotated continuously by the commutator brush shaft 38 through the reduction gearing 36. Becured to the shaft 31 is a notched clutch member 40 which is rotated continuously by the shaft, and is provided with two notches 4 I adapted to be engaged bythe dog 32. The said dog is urged vby spring 42 upon its release to engage the clutch member 40 and as the clutch member is rotated member 46 is loosely mounted on the shaft 31 and is adapted to cause the dog 32 to be released from or engaged with the clutch member 40. When the stop 3| is in the path of both niembers 35 and 46, member 46 forces the dog 32 out of engagement with the clutch member by rotating it partially about its pivot 34 thereby rais#l ing the dog out of the notch 4i. Upon release of the members 35 and 46 by stop 3l, the spring 42 causes the member 46 to be rotated slightly, thereby permitting the dog 32 to engage the clutch member 46 and as the notch 4i is presented thereto, engagement of the dog and clutch member is effected.

The said clutch member is provided with two notches 4I, therefore, upon the completion of a half revolution the clutch is disengaged to bring the disk 36 to rest. The disk is provided with two insulated segments 44 which are arranged to engage the brushes 43 when the disk 36 is at rest. The disk 36 is adapted to be rotated one half of a revolution during one revolutionoi.' the transmitting commutator brushes 45 which are rotated by shaft 36. To provide for stopping and releasing the clutch every half revolution, the

members 35 and 46 are extended similarly at each end thereof-so as to be engaged and blocked or released by the stop 3| in the manner just del scribed.

It will be understood that the usual number of key bars and power devices with their associated mechanisms are provided, but only one of them is shown for the sake of simplicity. It is obvious, therefore, that for a simplex system operation the transmitting unit may comprise the device just described including the cam operated clutch arrangement, and for the receiving unit.y

.5I-8 to i4 are connected in combination to the various rotary clutch brushes 43, so that upon e j apodos i vprovision is made since the cam operation is not v A to or may be an integral bar A is depressed,.releasing the associated cam over the .segments 5| thereof.

For example, assume that the character-'kei il to operate the associated clutch member and disk as, it is eeen in Figa that engagement or.. the dog 32 and member 46 is effected at a time s transmitted-te the une n', `as thetransmitting cmnmutator brushes -45 pass when the brush 45 passed over the synchronising ,segment 5i-I5 so that shortlyafterthej 'brushes 43 leave the insulated segment 44, the -brush 45 is in position to' engage segment li--I and the other transmitting segments progressively; in this manner the proper time values are always imparted to the character signals.

Release of the clutch disk 36 forI character A conditions the segments 6|-2 and 5|-3; that is, the said segments are now active segments for a.v predetermined timed interval which is equivalent to one revolution of the transmitting brushes 45. Therefore,-as the-brush 45 passes over the first segment 5I-2, a signal condition is set up by the following circuit, one side of the line by common conductor 53 is connected to one of the brushes 43 and dueto the conducting portion of the disk 36 is now connected to the remaining brushes 43, whereby, at this particular interval, the said line is connected to conductor `54, segment 5I-2, brushes 45, common conducta ing ring 55 to the other side of the line by conductor 56,**energizing the lines at this timed interval. As the brush 45 progresses to segment 6I-3, oneside of the line is now connected to conductor 51 to complete the circuit through the said segment again energizing the line.

It is seen, for each revolution of brushes 45, a synchronizing impulse'is transmitted over the line as the brushes pass over segment 5i -|5.

Referring now to Fig. 5, a segmented commutator is provided and similar to the transmitting distributor 56, twenty segments 6i are provided and arranged in groups as previously described. Additional segments 62 are provided to properly phase the receiving distributor motor 63 so as to operate in phase and synchronism with the transmitting distributor motor (not shown).A Assume that only the synchronizing impulses are transmitted and that the receiving system is just connected to the line by closed switch 64 to engage contacts A. If the synchronizing impulses are received as brushes 65 pass over the synchronizing segment 6I-|5, the signal 66 is energized to indicate the condition of synchronism; however, in the event that the synchronizing pulses are received as the brushes 65 pass overany vof the segments'62, the relay 61 is energized to open' the associated contacts 56 momentarily.

The purpose of opening one side of the line to the synchronous motor 63 is to cause the motor to slip a pole, thereby adjusting the brush position of the receiving distributor with respect to lthe brush position of the transmitting distributor. To limit the pole slipping to one pole per operation of relay 61, a resistance 63 is placed across the contacts 66 so as to be included in series in the motor supply circuit when contacts 66 are opened. When synchronism is obtained, the signal 66 is energized indicating the fact and switch 64 nowr is positioned to engage contact B conditioning the system for operation of the translating units.

The first group of character signals transmitr transmitter.

ted is provided to energize the controllingsolenoids 1l (Fig. 3) to release rotary clutches 14 which are released and stopped in exactly the same'manner'as the clutchesl described in the The energization of solenoid 1l displaces the arm 1i to release the dog 12 to e'ngage the clutch member 18 near the end of the `distributor cycle to rotate the conducting disk conductor 18 'and switch 64 to conductor 88 representing the other side of the incoming line.

Energizing of solenoid 1li-a releases the clutch disk 14.a to connect the corresponding brushes ll-a to the associated circuits; however, it must be understood that the dog 12 does not engage the notch or tooth of the clutch member 18 (Fig. 3) to rotate the disk ll-a until later in the said cycle, that is, approximately when the discondenser ail-a, conductors sa and 1s, switch s4 to conductor 80, charging the condenser. Attached to the distributor brush driving shaft 8l `(Fig. 3) is a control ring 85 provided with two conducting segments 86 and 81. Conducting segment 86 is arranged so that during the rotation of the control ring 85 it is adapted to engage brushes 88-a and 88-b and conducting segment 81 at a later interval in the cycle is adapted to engage brushes 88-b and A88-c. lConducting segment 86 is adapted to engage the associated brushes at a time in the cycle `approximately when the distributor brushes 65 pass over the segment 6I|5. The length of the said segment may be varied, the only provision being that it must be of such length to permit the discharge of the associated condenser 8l to be effective to energize the particular character key solenoid selected; the segment 81 then engages the associated brushes; a short timed interval later in the cycle.

As the segment 86 engages the brushes 88--a and 8'8-b, the condenser vBI-a just charged is now arranged to discharge through a particular character solenoid to effect the selection of a particular character key bar solenoid from a group of solenoids that are connected to the brushes thereby energizing solenoid i8 for the character A. The other solenoid circuits for characters Z, Q, and W, etc., are not ailected since the associated brushes 15--a are engaging the insulated portion of clutch disks 1li-a. 'I he segment81 then engages brushes Bil-b and 88-c to short faulty energization of any solenoid circuits in the following cycles.

It is evident from thedescription just set forth how the other character selections may be effected and further detailed description thereof is deemed not necessary. It is also seen that during the condenser discharge operation to energize the solenoids I8 and effect total discharge of the condenser, the first group of signals to energize the rotary clutch solenoids 10 `ymay be received on segments BI--i to 1, thus providing a certain degree of overlap in the system.

While there has been shown and described and pointed out the fundamental novel features o1 the invention as applied to a single modification,

it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation 4may be made by those skilled in the art without departing from the spirit of the invention. It is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is as follows: l 1. A communication system comprising a plu rality ot control circuits, and receiving means responsive to character signals comprising control means to select a predetermined number of control circuits and means including electrostatic discharge means to discharge vthrough a particular circuit of said selected group to effect selection of a single circuit from the said predetermined number oi circuits.

2. A communication system comprising means to receive'character signals to effect a selection of a single circuit from a plurality oi circuits comprising control means to select a predetermined number of circuits from said plurality of circuits, and means including a condenser to discharge through one of said predetermined number of circuits for eiiecting the selection thereof.

3. A communication system comprising a plurality of control circuits, and receiving meansy responsive to a plurality of character impulses during a predetermined time interval including.

control means conditioned by the first impulses received ata'ccrtain time in said timed interval and operated at a later time in said interval and a second control means including an electrostatic discharge device energized by Vthe second impulses received at a certain time in said interval and effective for discharge at a later time in the same to cause selection of va single circuit from said plurality of control circuits.

4. A communication system comprising, in combination means comprising cyclically operating rotary distributor means for receiving control signals represented by a plurality of impulses during one cycle thereof, a plurality of control circuits,A control means conditioned by the first impulse receivedduring the cycle and operated at a laten time in the cycle to select a predetermined number of said control circuits, and a second control means energized by a second impulse received during said cycle and eiective during part of the following cycle to effect selection of a single circuit from said predetermined number of circuits selected.

5. A communication system, comprising, in combination, means to receive control signals, a. plurality of control circuits, control means responsive to said signals to select a predetermined l number of said control circuits, and a second control means including means responsive to said signals and operated under control of the ilrst mentioned control means to effect a selection of a single rcircuit from saidpredetermined number of circuits. y 6. A communication system comprising, in combination, a plurality o! control circuits, means to receiveI control signals. control meansresponsive to said signals to select a predetermined number of circuits from said plurality of circuits. condensers charged by said control signals, and means to discharge said condensers at a later timed interval to effect 'selectionvof a single circuit from said predetermined number of circuits selected.

\ '1. 'I'he invention set forth in claim 6 in which means are provided to discharge the said condensers a second time before being charged by the said controlsignals.

8. A. communication system comprising, in

combination, means to receive control signals.

circuit selecting means conditioned by said signal and control means energized by said signal,

means whereby both the circuit selecting means and control means are operated at a later time to eilect the circuitl selecting operation, and

CHARIEBR.DOTY.

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