US690248A

US690248A - Synchronizing system.

Info

Publication number: US690248A
Application number: US5188301A
Authority: US
Inventors: William Duane
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-03-19
Filing date: 1901-03-19
Publication date: 1901-12-31
Anticipated expiration: 1918-12-31

Description

No. 690,248. Patented Due. 3|, IQOL W. DUANE.

SYNCHRONIZING SYSTEM.

(Application filed Mar. 19, 1901.) (No Model?) 2 Sheets-Sheet I.

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which the circuit-completer is rotated.

WILLIAM DUANE, or BOULDER, COLORADO.

SYNCHRONIZING SYSTEM.

SPECIFICATION forming part'of Letters Patent No. 690,248, dated December 31, 1901.

Application filed March 19, 1901.

10 all whom, it may concern:

Be it known that LWILLIAMDUANE, a citizen of the United States, residing'at Boulder, in the county of Boulder, State of Colorado, have invented'certain new and useful Improvements in Synchronizing Systems, of which the following is adescription, reference being had to the accompanying drawings and to the letters and figures of reference marked thereon.

My invention relatesto that class of instruments in which, as in printing telegraph, picture te1egraph,- and synchronous multiplex telegraph, a circular series of insulated contacts or a drum and one'or more circuit-completers are used, the series of contacts or drums or the circuitcompleter or completers at a receiving-station being rotated in synchronism with corresponding devices at the transmitting station; and my invention has for its object to provide means by which the electric motors driving the rotating devices, which may be either the series of contacts or the drums or the trailing fingers or circuit-completers may be maintained in synchronisni and at constant speed.

In carrying out my invention I provide means by which variations in speed between the motors at different stations will automatically cause such change in the circuit of one or the other of the motors as will so far correct its movement as to bring the motors into synchronism with each other, and I also provide each of the motors with a speed-limiting device by which as soon as the lagging motor is brought up to the proper speed of rotation further increase of speed will be prevented.

In the drawings, Figure 1 is a vertical sectional View of an instrument embodying my invention, the circuits being shown diagrammatically. Fig. 2 is a diagram of two terminal stations,illustrating the part of my invention intended to bring the'motors atsuch stations into proper synchronous relations.

In the construction shown in the drawings, A is the armature of the electric motor, by The armature A is vertically arranged and is carried by a shaft D, which is supported in suitable bearin gs.

B B are the field-magnets, and O is the com mutator, of the motor. In the motor shown Serial No. 51,883. (No model.)

the armature and field-magnets are in series; but,if preferred, the motor may be shuntwound. At any convenient point in the motor-circuit is placed a resistance R, which is arranged to be short-circuited in the manner and for-the purpose hereinafter set forth.

The shaftD extends upward above the commutators and carries, preferably at its upper end,a cross-bar or disk E,of wood or other nonconducting' material,secured to the shaft midway between its ends. At one of its ends the cross-bar carries anut Through this nut extends, as shown, a set-screw (2, preferably provided at its lower end with a contact-point f, preferably of platinum. Pivoted in the cross-bar bya pin h at a point near the shaft D is a swinging arm g,of conducting material, carrying near its free end a weight j, the weight serving to hold thearm pendent from its pivot when the armature is at rest. Gonnected to the pin his a wire is, and connected I to the set-screw e is a wire Z. These wires are led along the shaft D, as shown, to the commutator (3,where they are connected, respectively, to opposite sections of the commutator.

As soon as the armature, andwith it the cross-bar E, begins to rotate, the end of the swinging arm gis thrown outward and-upward. When the desired speed of rotation is attained, the end of the arm, whichis preferably provided with a platinum contact, is

brought into contact with the contact-point f, closing the circuit between the opposite sections of the commutator to which the wires Z0 and Z are connected and short-circuiting the portion of the armatu re-winding which is connected with these sections. The current in the armature being thus materially reduced,the speed will not be further increased, but will remain constant, as the instant it begins to lessen the weightj will'cause the arm 9 to drop sufficiently to break the short circuit and increase the current through the armature. By means of the set-screw e the position of the contact-pointf may be varied to regulate the speed as desired.

If desired, two or more swinging arms and contact-points may be used, and any number of opposite sections of the commutator may be connected with them, so that'a corresponding number of portions of the armature-winding will be short-circuited when the desired with the line-wireJ in the usual manner.

speed of rotation is attained. The cross-bar E is shown provided with nuts d at both ends, though only one of these nuts is shown provided with a set screw c.

On the shaft D below the armature A is secured a fly-wheel or balance-wheel F to secure steadiness of rotation. The lower end of the shaft D is supported in a suitable hearing G. Below the balance-wheel F, and preferably below the bearing G, is arranged the circular table H of insulated contacts or sun-wheel over which the trailing finger or circuit-completer 1 slides. While this table or sun-wheel may be arranged in any wellknown way, I prefer to so arrange it that the circuit-completer I shall make contact with the vertical sides of the contacts rather than their upper faces. The circuit-completer I may be conveniently carried by the balancewheel 1*. It is, however, essential only that it be so connected with the shaft D that it will be rotated by the motor to make contact successively with the several insulated sections.

The insulated conducting-sections of the circular table or sun-wheel, except as hereinafter described, are connected in the usual way with transmitting or receiving instruments, the circuit-completer I being connected through the shaft D and its bearing G A battery K or other source of current is provided in the line-wire circuit.

At opposite points in the contact-table or sun-wheel the insulated sections are divided,

two of the subsections being connected, re-

spectively, with magnets L and M, arranged as shown, and through them with ground.

Between the magnets L and M is arranged a pivoted armature O, of magnetic material, arranged to be attracted toward either one of these magnets which may be energized. On opposite sides of the outer end of the pivoted arm are arranged a stop P and a contact Q. The pin on which the armature O is pivoted is connected by wire m with the motor-cir cuit on one side of the resistance R, and the contact Q, is connected by wire a with the motor-circuit on the other side of the resistance R, so that when the armature O is brought into contact with the contact Q, as hereinafter described, the resistance R will be shortcircuited, thus lessening the resistance of the motor-circuit and permitting an increased flow of current through the motor, whereby its speed is instantly increased. The stop P limits the movement of the armature in one direction, its movement in the other direction being limited by the contact Q.

The cuttingout of the resistance R, as above described, is for the purpose of effecting the slight correction in the speed ofrotation of the motors at different stations necessary to maintain them in proper synchronous relation. The speed of the motors will be maintained constant by the speed-regulating deeeaaie vices above described it the electromotive force and external resistance in the drivingcircuit do not vary; but any considerable change in this external resistance will vary the speed slightly. This variation in speed is by my invention utilized to etfect such change in the speed of the motor which has fallen behind by short-circuiting part of its external resistance as will be su ificient to bring it again exactly in phase. In the construction shown for accomplishing this object the circular table of contacts or sunwheel II of station 1, referring to Fig. 2, has at diametrically opposite points insulated sections S and T, which are not connected to transmitting or receiving instruments, and the corresponding table of contacts or sunwheel H of station 2 has similarly-arranged sections S and T. Each of these sections is divided as shown, sections S and S being made up of insulated subsections 8 s and s s', respectively, and sections T and T each comprise a subsection it, of conducting material, and a subsection t't', of insulating material. The tables of contacts at the different stations are so arranged that the brush I of station 1 will be in contact with section S of table H at the same instant that brush I of station 2. makes contact with section T of table H. Subsections s and s" at stations 1 and 2, respectively, are in circuit, respectively, with magnets L and L, and subsections 3' and s are in circuit, respectively,with magnetsMandM. Subsectionstand iatthe respective stations are connected to ground.

If the motors at the two stations are eX- actly in phase, the brush I at station 1 will be in contact successively with subsections 8 and 8, while the corresponding brush 1 at station 2 is in contact with subsections t and 6, and the magnets L and M at station 1 will be energized in quick succession, with the resuit that the armature 0 will be thrown over and quickly back again without cutting out the resistance R for any appreciable time. If, on the other hand, the motor at station 1 lags behind the motor at station 2, so that the brush 1 at station 2 is no longer in contact with subsection t when the brush I at station 1 is in contact with subsection 8, the magnet L will continue to be energized, holding the armature 0 against contact Q and short-circuiting the resistance R and increasing the speed of the motor at station 1 until it is brought up in phase with the motor at station 2. If the motor at station 2 lags behind, it will be brought up into phase in the same way.

While I have shown and described specific means for correcting the variations in phase between the motors at diiferentstations and for preventing increase of speed of the lagging motor above the predetermined speed, it is evident that means for efliecting these purposes other than those which I have shown and described might be used. It should therecircuit-completer, the combination of means for correcting variations in phase between the motors at the difierent stations by increasing the speed of the slower motor and means connected with each of the motors by which, as

soon as the desired speed of rotation is attained, further increase of speed is prevented; substantially as described.

2. In a synchronizing system, comprising a plurality of stations, each provided with a circular series of insulated contacts, a rotating circuit-completer sliding over said contacts, and an electric motor for moving the circuit-completer, the combination of means for correcting variations inphase between the motors at ditferent stations, by reducing the resistance of the motor-circuit of the slower motor to increase its speed and means connected with each of the motors by which, as soon as thev desired speed of rotation is attained, further increase of speed is prevented; substantially as described.

3. In a synchronizing system, comprising a plurality of stations, each provided with a circular series of insulated contacts, a rotating circuit-completer sliding over said contacts and an electric motor for moving the circuit-completer, the combination of means for correctingvariations in phase between the motors at different stations, by reducing the resistance of the motor-circuit of the slower motor to increase its speed and means connected with each of the motors by which, as soon as the desired speed of rotation is attained, a portion of the armature-circuit is short-circuited to prevent further increase of speed; substantially as described.

4. In a synchronizing system, comprising a plurality of stations, each provided with a circular series of insulated contacts, a rotating circuit-completer sliding over said contacts and an electric motor for moving the circuitcompleter, the combination of means for correcting variations in phase between motors at different stations, comprising divided contacts at opposite points in the circular series of insulated contacts, one of said divided contacts being composed of insulated sections of conducting material in circuit respectively, with oppositely-arranged electromagnets, a movable armature arranged between said electromagnets, a contact against which said armature is arranged to be drawn by one of said electromagnets to short-circuit a resistanoe in the motor-circuit, to increase the speed of rotation of the motor, the opposite divided contact being composed of a section of conducting material and a section of insulating material; substantially as described.

5. In a synchronizing system, comprising a plurality of stations, each provided with a circular series of insulated contacts, a rotating circuit-completer sliding over said contacts and an electric motor for moving the circuitcompleter, the combination of means for correcting variationsin phase between motors at different stations, comprising divided contacts at opposite points in the circular series of insulated contacts, one of said divided contacts being composed of insulated sections of conducting material in circuit respectively, with oppositely-arranged electromagnets, a movable armature arranged between said electromagnets, a contact against which said armature is arranged to be drawn by one of said electromagnets to short-circuit a resist- .ance in the motor-circuit, to increase the speed of rotation of the motor, the opposite divided contact being composed of a section of conducting material and a section of insulating material, and means connected with each of the motors by which, as soon as the desired speed of rotation is attained, further increase of speed is prevented; substantially as described.

6. In a synchronizing system, comprising a plurality of stations, each provided with a circular series of insulated contacts, a rotating eircnit-completer sliding over said contacts and an electric motor for moving the circuitcompleter, the combination of means for correctin g variations in phase between motors at different stations, comprising divided contacts at opposite points in the circular series of insulated contacts, one of said divided contacts being composed of insulated sections of conducting material in circuit respectively, with oppositely-arranged electromagnets, a movable armature arranged between said electromagnets, a contact against which said armature is arranged to be drawn by one of said electromagnets to short-circuit a resistance in the motorcircuit, to increase the speed of rotation of the motor, the opposite divided contact being composed of a section of conducting material and a section of insn- WILLIAM DUANE.

Witnesses:

O. RIoKETTs, GEO. W. RICHARDSON.