Патент USA US2409897код для вставки
Oct. 2z, 194e. » G. H. PHELPS 2,409,895 ELECTRICAL P’OSITIONING SYSTEM Fí-l'ed Feb. 5, 1943 2 Sheets-Sheet 1 Z figli 5 ' /6 /Z WITNESSES: @4W INVENTOR , - f i @wege/Ww@ ' 74. ü@ ~ _ BY I ° ì I_SÄRYQ > Oct. 22, 1946. G, H_ PH'ELPS 2,409,895 ELECTRICAL PQSITIONING SYSTEM Filed Feb. -5, 1945 2 sheets-sheet 2 ATTORNEY Patented Oct. 22, 1946 2,409,895 UNITEDy vSTATES PATENT >OFFICE t _ 2,409,895 ELECTRICAL POSITIONING SYSTEM George H. Phelps,> Catonsville, Md., assignor to Westinghouse Electric Corporation, East VPitts burgh, Pa., a corporation of Pennsylvania Application February 5, 1943, Serial No. 474,829 6 Claims. 1 (Cl. 172-239) . This invention relates to electrical positioning e 2 systems and, more particularly, to a selective con trol of circuit elements from a remote point. wherein each position represents equal angular displacements over the path described by the arc of rotation. This is accomplished by the addition Positioning systems of the type to which this invention particularly relates include a motor mits further rotation of the motor after the de of a cam switch driven by the motor which per drive rotatable in both directions which is cou sired positioning has ybeen established. » pled to the driven element in such manner that Another advantage of the'positioning system the movement of the latter can be set to various herein described is _that the usual clutch between predetermined positions. In these systems, it is the motor and the driven element can be elimi essential that the driven element should be ac 10 nated by utilizing a novel drive inthe form of a curately positioned along a circular path to any Maltese-cross gear, so that the accuracyY of the preselected position, by rotation vin either clock setting is determined thereby. wise or counterclockwise direction. Control sys A particular feature of the invention resides in tems heretofore used generally employ a. split disc an extremely compact v mechanical assembly in cooperation with the driving motor which ro whichI is easily adapted to effect the positioning tates simultaneously with the i driven element. of any number of selector switches accurately to There is also a suitable electricalor mechanical clutch mechanism to disengage the motor when any preselected stop. with the contacts so that when any one of the ated element no actuating motor may start under ‘ ~ Y ' Another feature of the invention, as will be the driven element reaches the‘selected position. seen when considering its mechanical details, re On the split disc are placed a number of contacts, 20 sides in the drive mechanism for the vMaltese each defining one selectedA position ofthe driven cross gear which maintains a rigid contact posi element. The insulating space which separates tion for the selector «switches driven thereby. the two halves forms the dividing line between A marked advantage ofthe system herein de the ltwo directions of rotation of the motor. The scribed is its freedom fromtemperature varia free space between the two segments cooperates tionsin that prior tor the movement of the actu contacts through which a circuit is completed to no-load condition and may run for a definite time the `motor reaches this space it will open the» cir freely. In this manner operation is secured when cuit. f temperature> conditions adversely affect the motor When a split disc is used the rotation in each 30 speedandpower. v» `~ " « direction is confined to 180°. If rotation 4beyond' . Other features and advantages will be apparent that is desired up to nearly 360° each half of the from the following description of the invention, split disc may be replaced by individual contact pointed out in particularity by the appended discs carrying contact segments which make .a claims, and taken in connection with the accom complete revolution for each direction of rota 35. panying drawings, in which: -. tion. Figs.A 1, 2-and 3 show three views of the com While this type of remote control has been pact driving mechanism-as a unit which can be widely used, it has the disadvantage that for very attached to any desired number of selector accurate positioning avery accurate and small switches; Fig. 4 shows` a .schematic circuit ar clearance must exist between the two halves .of 40 rangementv for thefcontrol of the positioning thesplit disc segments. The slightest momen mechanism in combination, by way of example, tum of the turning‘disc augmented by the mo with the tuning mechanism of a radio receiver mentum of the motor may cause overriding, to-a number of preselected frequencies. whereby upon contact with the other segment a Referring to the drawings, in the views’of Figs. reversal of the motor is effected. This condition 45. 1, 2 and» 3, the driving motor I is shown to be creates hunting or oscillating around the desired mounted in a frame 2„the motor having a shaft point. Moreover, the accuracy ofvpositioning is 3 carrying a worm 4. The latter drives the worm limited by the Width of the insulating space be gear 5, the shaft 6 of which runs transverse to tween the discs which in practice has to be .wide the frame 2 in bearings ‘I and 8. Secured to enough to prevent hunting, and thereby allows 50 the shaft 6 and driven thereby is the lock wheel appreciable differences in the actual stopping po-> 9» carrying the pin I 0 .for driving the Maltese sition. cross wheel I2. On the other'y side of the gear 5, 'I’he present invention overcomes these disad the shaft 6 carries the cam I3, the surfaceY of vantages when such systems are used for the _po which engages the movable member I4 of the sitioning of switches or other circuit components, 56 hold-_lover switch I 5. 'I'he Maltese-cross wheel I2 2,409,895 4 drives the shaft I1 at one end, and at the other motor I. This source may be either alternating end it rotates the circuit control switch I8 and or direct current. The motor is of the dual* iield type, having iields 23 and 24. One terminal of each iield connects to one side of the incoming I5. The shaft I1 protrudes sufficiently to permit coupling thereto the selector switches which the Ul supply line in series with the armature or rotor which contacts brushes 25 and 2E. The other device is intended to position. In other words, terminal of field 23 connects through lead 21 to to the shaft I1 is connected the driven element the rider 28 of the circuit control switch I8 en of the positioning system. gaging the segment 22, and also through lead The mechanical features should be observed in 29 to the upper contact of the hold-over switch these figures for a clearer understanding of the I5. Similarly, the other terminal of field 24 system when considering the operation thereof .connects through lead 30 to the rider 3| which in connection with the various electrical controls. engages segment 22' of the circuit control switch It is seen, taking particularly Figs. 2 and 3 into I8, and also to the lower contact of the hold-over consideration, that as the motor shaft 3 revolves switch I5. Displaced around the switch I9 are the lock wheel 9 is turned by the worm gear 5. > the contacts 32, 33 and 3d, equidistantly placed The lock wheel 9 carries the locking member II corresponding to the number of steps which the which engages the corresponding peripheral face positioning system is to make in its intended of segment IB, of the Maltese-cross wheel I2.. As long as the member II engages the surface operation. Connected in parallel with the above of the segment I6, the Maltese-cross wheel I?. is 20 mentioned contacts are the contacts 35, 36 and 31 of the connecting switch 29, the rider of which is locked in position. At every revolution oi the connected through lead 38 to the moving contact lock wheel 9, the pin I0 engages the slot I9 be~ tween the segments IB and will drive the wheel I4 of .the hold-over switch I5. The contacts 39, I2 one segment in either direction depending 40 and 4I of the manual selector switch 42 con upon the direction of rotation oi the wheel 9. 25 nect also to contacts 32, 33 and 34, respectively. The manual selector switch 42 may be placed When the pin Hl engages the slot I9, the cutout portion of the member II unlocks the wheel I2, at any desired location and completes the current permitting movement thereof. It is to be noted path to the source in that its rider 43 is con that once the pin I0 leaves the slot I9, the wheel nected to the terminal B of the supply. 9 is free to rotate Without affecting the firm 30 The radio receiver shown here comprises a position of the Maltese-cross I2. In this manner, simple ampliiier and detector circuit tunable by as will be explained later, the -motor may continue means of the iiXed condensers 41, 48 and 49 in its rotation over a comparatively long segment the ampli-lier stage and the fixed condensers 50, in the circular -path of the pin I0, and may be 5I and 52 in the detector stage. Each of these the connecting switch 20 for the hold-over switch stopped anywhere along this segment without 35 condensers is indicated to be variable for a par interfering with the succeeding positioning of ticular setting to tune the receiver to a desired the Maltese-cross I2. This is an important fea station. Selector switch ‘53 connects any one of ture and instrumental in the »absolute accuracy of each step in the positioning of the shaft I1. the condensers 41, 48 or 49 to the grid `55 of and the various mechanical elements are spaced far apart, and particularly the shaft I1 >is shown extended. Coupled to the shaft is shown, by way of example, a set of rotary switches for the bearing on the invention herein described and need not be considered in detail. Suffice it to say that when switches 53 and 54 connect cor the Vacuum tube `56, tuning thereby the grid Referring now to the operation of the system 40 circuit comprising the secondary 51 oi the radio and observing the circuit shown in Fig. A4, it is frequency input transformer 58. Similarly, the seen that the important mechanical elements selector >switch 54 connects any one of the con are shown in vperspective and the electrical cir densers 5I), `5I or 52 in shunt with the secondary cuit is schematically represented. For the pur 59 of the coupling transformer 60. The various pose of clear illustration, the control switches 45 circuit elements of the radio receiver have no remote actuation of the tuning of a radio re ceiver. The electrical positioning device in ac responding contacts, the radio receiver is tuned 50 to receive a selected station. Describing the operation, let us assume that cordance with this invention is well adapted for the entire system is at rest. It is seen that fol use in connection with radio receivers, and for lowing the circuit from the A terminal, the motor this reason it was chosen to illustrate its opera iields 23 or 24 are not energized, since the con tion in connection with a radio receiving system. 55 nection to the field is broken in that neither It is to be understood and can readily be seen switch I8 nor switch I5 is closed to the contacts that, in place of the tuning arrangement of the selected by switch 42. Thus the center contact radio receiver, other types of rotary switches 40 of the >switch 42 was chosen as the desired may be actuated for a variety of purposes, such position when the system was last operated. Fol as selecting different electrical circuits. While 60 lowing the connection to the center contact 33 there are only two switches shown, any number of the switch I8, We see that the circuit is broken may be employed as long as they are to be ac by the insulation between the segments 22 and tuated simultaneously. The switches may also 22’. Furthermore cam I3 is in such position have any number of contacts provided that the that the moving contact I4 of the switch I5 is Maltese-cross wheel segments are accordingly 65 between the upper and the lower contacts. proportioned and the size of the circuit control Let us now turn the manual selector switch switch I8 allows the placement of the number 42 to the position whereby its rider 43 engages of riding contacts desired side-by-side along the the contact 4I. Following the circuit from the two operating segments 22 and 22’ respectively. B terminal, we see that the current will flow To avoid unnecessary complication of the circuit, 70 through the contact 34 of the switch I8 and there are only three contacts shown, sufficient it finds a path along the segment 22’ to the con is believed for a `thorough understanding of the tact 3| and through lead 39 to the field 24 and through the motor to the terminal A. It should operation of the system. be noted also that the rider of the switch 2D does The terminals A and B indicate the con nection to a source of power for driving the 75 not engage the contact 31, so that the moving 2,409,895 5 >6 arm I4 of the switch I5, is not connected to the current source.4 The purpose of the switch 20 will be better understood when the` operation ofthe system becomes clear and will be explained here after in greater detail'. ' ' ‘ We have seen that the field 24 become'fen e'rgized, when the switch 42 was moved to en the lower contact toi break the circuit to the motor. Considering now- the operation of the switch 2li, it will be seen thatit is intended to control the‘connection'of the arm I4 of the hold-over switch I5 to the supply circuit in such manner thatwhen the manual selector switch 42 is placed ergize contact 4I. The connections of the motor to any desired contact for the next ensuing op eration, connection `to the arm I4 of the hold energized, the motor will turn the worm 4 so as 10 4over switch I5 is broken until the shaft I1 is to rotate the worm-gear 5 in the proper direction moved tothe selected position. Then contact whereby the Maltese-cross wheel I2 moves the of the hold-over switch arm I4 is again estab shaft I1 so that the contact 34 of the circuit lished through the new setting of the switch 20. control switch lI8 shall be placed between the I claim as my invention: ' Y segments 22 and 22’. In accordance with the 15 1. In an electrical positioning system, switch operation in the manner chosen it is seen that ingA means adapted to be positioned in deñnite the rotation of the worm gear 5 must be counter ' steps over a series of contacts, a motor for driv clockwise as indicated by the arrow,` since move ing said means, an energizing >circuit for said ñelds are so -made that when the ñeld 24 is ment of the drive pin I I) in this direction will motor including a current source and a circuit rotate the Maltese-cross wheel I2 in a clockwise 20 control »switch in series therewith operated in direction. It should be noted here that as the conjunction with the positioning of said means, worm gear 5 rotates and the pin IIJ approaches 'said circuit control switch determining also the the Maltese-cross wheel I2, the cam I3 will lift direction offrotation of said motor, a selector the moving arm I4 of the switch I5 so that it switch adapted to be placed at a remote point engages the upper contact thereof. However, this 25 for selecting at will the -positioning of said in no way inñuences the rotation of the motor I switching means to any one of the number of in the direction indicated in that, as can be seen said series of contacts, said selector switch com in tracing the circuit, the field 23 is not connected pleting the energizing circuit through said con to the source, because the circuit through con trol switch to said motor and a hold-over switch tact I4 and upper contact I5 is broken at con 30 maintaining said energizing circuit closed until tact arm 20 of the switch 20 and also at contact the positioning of said switching means is fully 39 of the switch 42. As the drive pin I 0 moves completed and after said control switch reaches the Maltese-cross wheel I.2 one step and shaft its open circuit position. I1 is turned thereby, the switch I8 will be moved 2. In an electrical positioning system, switching so that the segment 22’ no longer engages the 35 means adapted to be positioned in deñnite steps Contact 34. The latter` will be now in the same ‘over a series of contacts, a motor for driving said position as .the contact 33 was previously, that means, an energizing circuit for said motor in is, the circuit therethrough will be broken. At cluding a current source and a circuit control the same time, the switch 2D will engage con-A switch in series therewith operated in conjunction tact 31. rI'he switches 53 and 54 are now also 40 with the positioning of _said means, said circuit positioned so that condensers 41 and 50 are control switch determining also the direction of placed across the respective circuits of ythe re rotation of said motor, a selector switch adapted ceiver. The instant when this occurs the drive to be placed at a remote point for selecting at pin IU will be just ready to leave the slot, and will the positioning of said switching means to the motor would stop since the contact 34 is not 45 any one of the number of said series of con in engagement with the segment 22', and the tacts, said selector switch completing the ener circuit is broken between contacts 34 and 3|. gizing circuit through said control switch to said However, the operation' of the hold-over switch motor and a hold-over switch operated by a cam I3 assures continued rotation of the motor and driven by said motor for maintaining said ener also, of course, of the pin Il) of the lock wheel 50 gizing circuit closed until the positioning of said 9. The reason for this is that the cam I3 will switching means is fully completed and after now oiîer the smaller diameter of its contours said control switch reaches its open circuit posi to the moving arm I4 of the hold-over switch tion. I5, so that the lower Contact thereof is in en 3. In an electrical positioning system, switch gagement. In tracing the circuit, we see that 55 ing means adapted to be rotatably positioned in the current starting from the terminal B will definite angular steps over a series of contacts, iiow through contact 4I of the switch 42, contact a reversible motor for driving said means, an 31 of the switch 20, through lead 38 and the energizing circuit for said motor including a cur lower contacts of the hold-over switch I5 through rent source and a circuit control switch in series the iield 24. The rotation will continue until 00 therewith operated in conjunction with the rota the cam I3 reaches the original starting position tion of said means, said circuit control switch shown, whereby the arm I4 of the hold-over determining also the direction of rotation of said switch I5 is again in the mid-position between motor, a selector switch adapted to be placed the upper and lower contacts. Whatever mo at a remote point for selecting at will the posi mentum the motor may have had, including the 65 tioning of said switching means to engage any momentum of the worm gear '5 and lock wheel 9 one of the number of said series of contacts, said which would tend to continue rotation of the selector switch in series with said control switch motor even after the arm I4 of. the hold-over completing the energizing circuit to said motor, switch I5 breaks the circuit, will not affect the and a hold-over switch operated by a cam driven accuracy of the setting of the driven elements 70 by said motor for maintaining said energizing in that the Maltese-cross wheel stays in locked circuit closed until the rotation of said switching position over a substantial travel of the drive means is fully completed to the selected contact pin I0. The stopping surface 44 of the cam I3 and after said control switch reaches its open circuit position. has sufficient length to allow for the movement 4. In an electrical positioning system, switch due to momentum when the arm I4 is lifted from 75 2,409,895 ing means adapted to be rotatably positioned in deñnite equidistant steps over a series of con tacts, va reversible motor for driving said means, an energizing circuit `for said motor including a current source and a "circuit control switch in series Vtherewith operated in conjunction lwith the rotation of said means, said circuit control switch Ydetermining also the direction of rota tion of said motor, a selector switch adapted to be placed at a remote point for selecting at will the positioning of said switching means to any one of the number of said series of contacts, said selector switch completing the energizing circuit in series with said Icontrol switch to said motor and a hold-over switch `in `shunt with said control switch for maintaining said energizing circuit closed until the positioning of said switch means is fully completed and after said control switch reaches its open circuit position. 5. In an electrical positioning system, driving means comprising a reversible motor, driven means, a drive «between said motor and said‘ driven means including `means for positioning said driven means to a fixed step of `angular displacement for each complete revolution of said . drive in either direction, an electrical control circuit for said motor includinglmeans for de termining the direction oi' rotation of said driven means and -for selecting a particular step of dis placement .thereof, and control `means for com pleting the revolution of said drive to substan tially the same stopping point after said driven means vis positioned to a selected step. 6. In an electrical positioning system, driving means comprising a reversible motor, driven means, `a drive between said motor and said driven means including a Maltese-cross coupling for positioning said driven means to a fixed step of 'angular displacement for each complete revo lution of said drive in either direction, an elec trical control circuit for said motor including switching means actuated by said driven means for determining the direction of rotation of said driven means and for selecting a particular step of displacement thereof, and control means for said motor for completing the revolution of said drive to substantially the same stopping point after said driven means is positioned to a selected step. GEORGE H. PHELPS.