US3562427A - Rotation control device - Google Patents
Rotation control device Download PDFInfo
- Publication number
- US3562427A US3562427A US682083A US3562427DA US3562427A US 3562427 A US3562427 A US 3562427A US 682083 A US682083 A US 682083A US 3562427D A US3562427D A US 3562427DA US 3562427 A US3562427 A US 3562427A
- Authority
- US
- United States
- Prior art keywords
- phase
- signal
- driven shaft
- rotation
- pulley
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/0016—Control of angular speed of one shaft without controlling the prime mover
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S474/00—Endless belt power transmission systems or components
- Y10S474/90—Phase variator
Definitions
- This invention relates to a rotation control device which is effective for use in a magnetic recording and reproducing apparatus of the rotary head type.
- the present invention contemplates the provision of a rotation control device for use in an apparatus of the kind comprising a magnetic tape and a rotary head assembly including a plurality of magnetic transducers for the recording and reproduction of a wide-band signal, in which, in lieu of a complex and expensive structure well known in the art which includes therein individual exclusive motors and associated power amplifiers for separately driving the magnetic tape and the rotary head assembly, a single motor which is driven from a commercial power supply is employed to drive both the magnetic tape and the rotary head assembly, and a unique stepless speed change mechanism whose speed change ratio can precisely be controlled by a very slight electrical power is operatively interposed between the motor and the shaft of the rotary head assembly.
- a rotary head assembly having a drum including therein four magnetic transducers is provided and a magnetic tape is advanced perpendicular to the plane of rotation of the rotary head, and a guide means cups the tape for contact with the transducer units. More precisely, the magnetic tape is driven past the head in its longitudinal direction at a speed of inches per second and a video signal is recorded in the form of a series of transverse lines or tracks.
- the rotating speed or the phase of rotation of the rotary head was controlled, if so required, by comparing a signal which is dependent upon the rotation of the rotary head with a reference signal to derive an error signal therebetween, and utilizing the error signal to control the rotation of the rotary head. Further, in view of the requirement according to which a specific relationship had to be established between the running speed of the magnetic tape and the rotating speed of the rotary head in the case of reproduction, a signal representing the running speed of the tape was compared with a signal which is dependent upon the rotation of the rotary head to thereby derive an error signal therebetween, and the error signal was utilized to control the rotation of the tape drive motor.
- Pat. No. 3,293,359 disclose a method in which a magnetic tape was helically driven to wrap up the substantially half periphery of a cylindrical tape guide, and a rotary head assembly accommodated in the cylindrical tape guide made sliding contact with the tape through a slit extending over the entire periphery of the cylindrical tape guide, thereby forming a series of skewed tracks on the tape.
- a novel and improved rotation control device for use in an apparatus of the kind comprising a magnetic tape and a rotary head assembly including therein a plurality of magnetic transducers for the recording and reproduction of a wide-band signal, in which an AC synchronous motor driven by a commercial power supply is employed to serve as a common drive means for the rotary head assembly and the magnetic tape, and a stepless speed change mechanism is employed to connect the common drive means with the shaft of the rotary head assembly thereby facilitating the desired control of the rotation of the rotary head assembly and the magnetic tape with a sufficient degree of precision.
- Another object of the present invention is to provide a rotation control device for use in an apparatus of the abovedescribed character, in which an AC synchronous motor driven by a commercial power supply is employed to serve as a common drive means for the magnetic tape and the rotary head assembly, and a unique stepless speed change mechanism whose speed change ratio can be precisely controlled by a very slight electrical power is interposed between the common drive means and the shaft of the rotary head assembly so that during the record mode the rotary head assembly can be driven in a synchronous relation with a reference signal delivered from a reference signal source hav ing a periodicity thereby forming the desired tracks of record on the magnetic tape.
- a further object of the present invention is to provide a rotation control device for use in an apparatus of the abovedescribed character adapted for the recording and reproduction of a television signal, in which the synchronizing signal in the television signal having been recorded along one edge of the magnetic tape during the record mode is reproduced from the magnetic tape during the playback mode so that the reproduced signal can be utilized as a reference signal for driving the rotary head assembly for the reproduction of the tracks of record of the television signal provided on the magnetic tape.
- Another object of the present invention is to provide a rotation control device for use in an apparatus of the abovedescribed character adapted for the recording and reproduction of a television signal, in which an AC synchronous motor driven by a commercial power supply is employed to serve as a common drive means for the rotary head assembly and the magnetic tape, the common drive means being connected with the shaft of the rotary head assembly through a unique stepless speed change mechanism whose speed change ratio can be precisely controlled by a very slight electrical power, and during the record mode, the rotary head assembly is driven in a synchronous relation with a control signal responsive to the synchronizing signal in the television signal to be recorded thereby forming the tracks of record of the television signal on the magnetic tape and at the same time recording the synchronizing signal in the television signal on one edge of the magnetic tape, while during the playback mode, the synchronizing signal having been recorded on one edge of the magnetic tape is reproduced and is utilized as a reference signal so that a very slight electrical power representing an error between the phase of the reference signal and the phase of a signal, responsive to the rotation
- FIG. 1 is a plan view of a magnetic tape recording and reproducing apparatus having a rotation control device embodying the present invention
- FIG. 2 is a diagrammatic view showing a series of tracks of a high frequency signal recorded on a magnetic tape by the magnetic tape apparatus shown in FIG. 1;
- FIG. 3 is an exploded perspective view of a part of the drive system for the rotary head assembly and the magnetic tape;
- FIGS. 4a to 4d are diagrammatic views showing the relation between pulleys and a belt in a stepless speed change mechanism which is the basic component in the device according to the present invention
- FIGS. 5, 6 and 7 are diagrammatic views showing other forms of the stepless speed change mechanism.
- FIG. 8 is a schematic block diagram showing one form of the rotary head drive control system in the device according to the present invention.
- FIG. 2 there is shown one form of the tape drive system in the device according to the present invention which is adapted to drive a rotary head assembly in a synchronous relation with the phase of a reference signal.
- the drive system is mounted on the base plate 51 which is generally called a tape transport panel.
- a tape guide 52 of cylindrical shape is provided with a housing 66 which is securely fixed to the panel 51.
- the tape guide 52 is provided with a slit (not shown) through which the front end of two magnetic heads 54 and 55 mounted at diametrically opposite positions on the periphery of a rotary head drum 53 can protrude from the tape guide 52.
- a magnetic tape 57 fed from a supply reel 58 travels past an idler 59 and a guide post 60 to engage the tape guide 52 along an arcuate path in such a manner as to partly wrap up the tape guide 52 for receiving a recording thereon or for reproducing a 'ecording therefrom by the action of the magnetic heads 54 and 55 mounted on the rotary head drum 53.
- the magnetic tape 57 having been recorded or reproduced leaves the tape guide 52 to be guided past another guide post 61, a control signal record-reproducing head 62, a capstan means 63 and an idler 64 to be finally taken up on the takeup reel 65.
- the supply reel 58, the idler 59 and the guide post 60 are so mounted on the tape transport panel 51 that they have a different height relative to the height of the takeup reel 65 and the guide post 61, with the result that the magnetic tape 57 moving past one guide post 60 toward another guide post 61 helically runs on the tape guide 52 while making a certain angle with respect to the surface of the tape transport panel 51.
- the recording and reproduction of the helical scanning type can be applied to the magnetic tape 57, and its apparent that magnetized bands 67 and 68 of the kind as shown in FIG. 2 are formed on the magnetic tape 57 by the magnetic heads 54 and 55.
- the range of engagement between each magnetic head and the magnetic tape can be limited to a substantially semicircumferential range through which each magnetic head rotates in sliding contact with the tape.
- one of the magnetic heads starts to engage the magnetic tape 57 when the other is about to leave the magnetic tape 57.
- the reference numeral 69 designates a magnetized band formed by the stationary head 62.
- FIG. 3 illustrates in an exploded perspective fashion a system for driving the magnetic tape and the rotary head assembly in the magnetic tape apparatus having the rotation control device embodying the present invention.
- An AC synchronous motor 70 adapted to be driven by a commercial power supply is supported on the panel 51.
- a pulley 100 is mounted on one end of the shaft 71 of the motor 70, and a torque-transmitting elastic belt 73 is trained around the pulley 100 and a pulley 72 which serves both as a speed reducing means and a flywheel so as to drive a tape-driving capstan shaft 74 connected to the pulley 72 in a manner well known in the art.
- the capstan shaft 74 has its drive power supplied from the synchronous motor 70 to thereby rotate at a constant number of rotations.
- a second elastic belt 75 is trained around a conical pulley 76 fixedly mounted on the other end of the shaft 71 of the synchronous motor 70 and a conical pulley 78 fixedly mounted on the shaft 77 of the rotary head drum 53, so that the shaft 77 can be driven by the synchronous motor 70 through the second. belt 75.
- An eddy current brake means 79 is operatively associated with the shaft 77 of the rotary head drum 53 and serves to precisely control the rotating speed of the shaft 77 of the rotary head drum 53 independently of the number of rotations of the synchronous motor 70.
- the combination comprising the two conical pulleys 76 and 78, the elastic belt and the eddy current brake means 79 is designated in the present invention as a stepless speed change mechanism.
- the eddy current brake means 79 may, for example, have such a structure that an exciting iron core 82 having thereon a DC exciting winding 81 surrounds a squirrel-cage induction rotor of the aluminum die casting type which is generally used in an induction motor.
- FIGS. 4a to 4d The stepless speed change mechanism which is the basic and essential component of the rotation control device according to the present invention will be described in more detail with reference to a model diagrammatically shown in FIGS. 4a to 4d, wherein FIG. 4a is a front view, FIG. 4b is a sectional view along the centerline of the belt and FIGS. 40 and 4d are explanatory front views, respectively. of the stepless speed change mechanism.
- conical pulleys and 86 of the same shape having a suitable cone angle are mounted in opposite directions to each other on two parallel shafts 83 and 84, respectively, and a flat rubber belt 87 is trained under a suitable tension around the two pulleys 85 and 86.
- the belt 87 can be driven in a balanced state to follow a fixed path around the conical pulleys depending on the cone angle of the conical pulleys 85 and 86, the tension developed in the belt 87'due to a load torque imparted to the shaft 84, and the force of friction developed between the belt 87 and the surfaces of the conical pulleys 85 and 86, with the result that a driving force is transmitted to the shaft 84 to rotate the shaft 84 at a certain number of rotations n
- the number of rotations of the driven shaft 84 is reduced as the position of the belt 87 moves in a direction as shown by the arrow in FIG.
- the number of rotations of the driven shaft 84 can be varied by applying a torque load to the shaft 84 by means such as an eddy 'current brake means.
- the impartation of the torque load to the driven shaft 84 causes a variation in the tension of the belt 87 to thereby shift the balanced position of the belt 87 in the direction of the arrow so that the number of rotations of the driven shaft 84 can be varied without varying the number of rotations of the driving shaft 83.
- FIG. 4b is a cross-sectional view to show the engagement between the belt 87 and the pulleys 85 and 86 when viewed from the top ends of the shafts 83 and 84.
- T, and T designate the belt tension on the tensile side on the slack side, respectively, relative to each of the pulleys 85 and 86 under the running state of the belt 87.
- T, T there is a relation T, T, between these tensions.
- the belt 87 at the entrance to the conical pulley 85 mounted on the driving shaft 83 is also stabilized at a position at which an axial component F, of the friction force of the conical pulley 85 is balanced with an axial component 1, of the belt tension T as shown in FIG. 4d.
- the belt tension T is increased to a value T, whose axial component f, also becomes greater than f,, with the result that the belt 87 is shifted toward the smaller diameter portion of the driving'conical pulley 85 to be stabilized thereat.
- the balancing position of the belt is shifted toward the larger diameter portion of the driven pulley and toward the smaller diameter portion of the driving pulley.
- the balancing position of the belt is shifted in a direction opposite to the above direction, and it is thus possible to control the number of rotations of the driven pulley by varying the value of the brake torque.
- the variation in the speed of the driven pulley due to the application of the brake torque includes an elastic slip of the elastic belt due to the application of the control load torque, in addition to the components variable depending on the engaging position of the belt with the surface of the pulley as described above, this elastic slip component works quite effectively as it varies in a cooperative manner with the above-described components which are vari able by shifting the position of the belt.
- a conical pulley 111 is fixedly mounted on a driving shaft 83, while a conical pulley 112 is fixedly mounted on a driven shaft 84, and the cone angle of the pulley 111 is larger than that of the pulley 112.
- belt 87 trained around the conical pulleys 111 and 112 protrudes in a larger amount beyond the large diameter end of the conical pulley 111 as the difference in the cone angles of the conical pulleys is made larger.
- the pulleys 111 and 112 are made from aluminum subjected to a hard alumite treatment and have respective cone angles of 20 and 18, these pulleys having a diameter of about 45 mm. at a position at which the belt 87 is trained, the belt 87 is in the form of a sheet of polyurethane having a hardness of 65, a thickness of 0.5 mm., a width of 8 mm. and a length of 450 mm. and the axial spacing between the pulleys is 180 mm. Then, with a normal torque load in the order of 40 gr.-cm., the belt 87 protrudes by an amount in the order of percent of the 8 mm. width. The amount-of protrusion of the belt 87 becomes smaller for the reason as described previously when the load torque imparted to the shaft 84 is made greater.
- an intermediately bulged conical pulley 113 of such a shape as may be made by bonding two driving pulleys 111 as shown in FIG. 5 to each other at their large diameter ends is fixedly mounted on a driving shaft 83, and a belt 87 is trained around the driving pulley 113 and a driven conical pulley 112 fixedly mounted on a driven shaft 84.
- the belt 87 is stabilized under a state as shown in FIG. 6 in which the belt 87 embraces the bulged middle portion of the driving pulley 113.
- the pulley 113 has a larger cone angle than the pulley 112 in the above pulley combination.
- the belt 87 is stabilized under a state in which it engages the pulley 113 with about 15 percent of the total width thereof on the lower side of the bulged middle portion of the pulley 113 and with about percent of the total width thereof on the upper side of the bulged middle portion of the pulley 113.
- the belt 87 is shifted upwardly in FIG. 6 to engage the pulley 113 at a different position.
- FIG. 7 there is shown a pulley 114 which, in its vertical section, has an arcuate shape having a certain curvature and is different in its shape from the shape of the pulley 113 which has a sharply defined, bulged, middle portion.
- the pulley 114 is fixedly mounted on a driving shaft 83, and a belt 87 is trained around the driving pulley 114 and a driven conical pulley 112 fixedly mounted on a driven shaft 84.
- the belt 87 operates in the same manner as that shown in FIG. 6.
- One of the pulleys in the above pulley combinations shown in FIGS. 5, 6 and 7 may be axially adjustably mounted on the associated shaft.
- the amount of a load actually imparted to the driven shaft and the number of rotations reduced due to the impartation of the load will be considered with reference to FIG. 6 in which it is supposed that the pulleys and the belt have respective dimensions as described previously.
- the load torque imparted to the driven shaft 84 is 250 gr.-cm. and the number of rotations of the driving shaft 83 is 1,800 rpm, then a speed reduction in the order of rpm. can be effected on the driven shaft 84, and the number of rotations of the driven shaft is reduced substantially in proportion to the amount of the imparted load torque.
- the eddy current brake for imparting the above-described brake torque comprises a squirrel-cage induction rotor which has a diameter of 20 mm. and a length of 16 mm. and is made from laminated silicon steel core with 20 aluminum wires die cast therein, and an exciting iron core having an exciting winding with 4.800 ampere-tums. Then, a DC power of 24 volts and 50 ma. supplied to the winding when the number of rotations is 1,800 rpm. can generate a brake torque of 250 gr.-cm. It
- the shape of the pulleys forming one set may be suitably selected so that the driven pulley rotates at a number of rotations slightly higher than the desired value under a state in which the eddy current brake imparts to the driven shaft a zero torque or a suitably biasing torque, and the eddy current brake may then be suitably controlled to effect the rotation of the driven pulley at the desired speed.
- the desired purpose of rotating the driven pulley at a number of rotations in conformity with the phase of a reference signal can easily be attained by detecting photoelectrically or magnetically the rotation of the driven pulley to thereby derive a signal representing the phase of rotation of the driven pulley, comparing the phase of the above signal with the phase of the reference signal to thereby derive an error signal, rectifying the error signal, and controlling the eddy current brake by supplying the rectified output thereto in a negative feedback fashion in a closed loop system.
- a composite video signal derived from a television receiver or a television camera during the record mode is fed past an input terminal 90 into a vertical synchronizing signal separator 91 where the vertical synchronizing signal in theform of a pulse signal at 60 cycles per second is solely separated.
- the pulse signal is then fed into a one-half frequency divider 92 to be turned into a pulse signal at 30 cycles per second which is then suitably delayed and shifted in its phase by a phase shifter 93.
- the signal is then passed through a switch S to be supplied as one of the input signals to a phase comparator 94.
- a permanent magnet 101 is fixedly mounted at a suitable position on the peripheral portion of the rotary head drum 53 in such a relation that it is closely opposite to a stationary pickup head 102 so that a signal is derived from the pickup head 102 by each rotation of the rotary head drum 53.
- the above signal constitutes another input signal to the phase comparator 94.
- the phase comparator 94 compares the phases of these two input signals with each other to deliver an error signal, which is smoothed out by a low-pass filter 95 and is suitably power amplified by a DC amplifier 96, the amplified DC output being then supplied to the exciting winding 81 of the eddy current brake means 79.
- the conical pulleys 78 and 76 having their large diameter ends disposed in directions opposite to each other are mounted on the rotary shaft 77 of the rotary head drum 53 and the drive shaft 71 of the AC synchronous motor 70 driven from a commercial power supply, respectively, and the torque transmitting the elastic belt 75 is trained around the conical pulleys 78 and 76.
- the conical pulleys 78 and 76 are so designed that the rotary head drum 53 is driven at a speed which is higher by a suitable amount, say, to rpm. than the rated speed, 1,800 rpm, under a state in which a zero brake current is supplied to the eddy current brake means 79.
- FIG. 2 illustrates the magnetized bands recorded on the magnetic tape 57 by the above recording process, in which the obliquely running tracks 67 and 68 are produced by the magnetic heads 54 and 55, while the track 69 running adjacent to the lower end of the tape 57 is produced by the control signal head 62.
- the control pulse signal recorded on the magnetic tape 57- is reproduced by the control signal head 62 and is fed through the record-reproducing amplifier 97 and the switch S into a phase shifter 99 where the signal is suitably subjected to a phase shift.
- the signal is then fed through the switch S into the phase comparator 94 to constitute one of the input signals which corresponds to the reference signal supplied during the record mode. Therefore, the operation thereafter is similar to that described with regard to the recording operation.
- the rotation of the head drum 53 carrying thereon the magnetic heads 54 and 55 is controlled in such a manner that its phase is in synchronism with the reproduced control signal as described previously. Therefore, when the delay time of the phase shifter 99 is adjusted to a suitable value, the magnetic heads 54 and 55 can exactly trace the tracks 67 and 68 drawn in the recording operation since the magnetic heads 54 and 55 can move directly above the tracks 67 and 68.
- the magnetic recording and reproducing apparatus equipped with the rotation control device according to the present invention has a tape drive system and a rotary head drum drive system which are remarkable simplified, inexpensive and easy to maintain compared with like systems in the prior magnetic recording and reproducing apparatus described previously. More precisely, in contrast to the prior form in which the capstan and the rotary head drum are driven from separate motors with associated power amplifiers, the device according to the present invention employs a method in which an AC synchronous motor driven from a commercial power supply is used to drive both the capstan and the rotary head drum.
- present invention is therefore advantageous over the prior art in that the number of the motors to be incorporated in the apparatus can be substantially reduced, and the complex electric circuit to drive the separate motors as in the prior art can be substantially eliminated, thus reducing the overall size of the apparatus and simplifying the structure of the apparatus.
- a rotation control device comprising means including a pulley mounted on a driving shaft which is rotated in a predetermined direction at a constant speed, a pulley mounted on a driven shaft which is desired to be driven in a fixed relation with the phase of a reference signal, one of said pulleys being a conical pulley and the other being an intermediately bulged pulley, and a torque-transmitting elastic belt trained around said pulleys for transmitting the rotation of said driving shaft to said driven shaft, means for deriving a signal which is in synchronism with the phase of rotation of said driven shaft, means for comparing the phase of the signal which is in synchronism with the phase of rotation of said driven shaft with the phase of said reference signal for thereby deriving a control signal which represents the phase difference between said signals, and means operative in response to the application of said control signal to impart a corresponding brake torque to said driven shaft for thereby automatically varying the engaging position between said torque-transmitting belt and said conical pulley.
- a rotation control device comprising means including a pulley mounted on a driving shaft which is rotated in a predetermined direction at a constant speed, a pulley mounted on a driven shaft which is desired to be driven in a fixed relation with the phase of a reference signal, at least one of saidpulleys being a conical pulley, and a torque-transmitting elastic belt trained around said pulleys for transmitting the rotation of said driving shaft to said driven shaft, one of said pulleys being so adapted as to be adjustably movable in the axial direction of the shaft on which it is mounted, means for deriving a signal which is in synchronism with the phase of rotation of said driven shaft, means for comparing the phase of the signal which is in synchronism with the phase of rotation of said driven shaft with the phase of said reference signal for thereby deriving a control signal which represents the phase difference between said signals, and means operative in response to the application of said control signal to impart a corresponding brake torque to said driven shaft for thereby automatically varying
- a rotation control device comprising means including a pulley mounted on a driving shaft which is rotated in a predetermined direction at a constant speed, a pulley mounted on a driven shaft which is desired to be driven in a fixed relation with the phase of a predetermined reference signal, at least one of said pulleys being a conical pulley, and a torque-transmitting resilient belt trained around said pulleys for transmitting the rotation of said driving shaft to said driven shaft, means for deriving a signal which is in synchronism with the phase of rotation of said driven shaft, means for comparing the phase of the signal which is in synchronism with the phase of rotation of said driven shaft with the phase of said reference signal for thereby deriving a control signal which represents the phase difference between said signals, and brake means operative in response to the application of said control signal to impart a corresponding brake torque to said driven shaft, said brake means including a squirrel-cage induction rotor fixed to said driven shaft and an exciting iron core for applying to said rotor a
- a rotation control device comprising means including a pulley mounted on a driving shaft which is rotated in a predetermined direction at a constant speed, a pulley mounted on a driven shaft which is desired to be driven in a fixed relation with the phase of a reference signal, at least one of said pulleys being a conical pulley, and a torque-transmitting elastic belt trained around said pulleys for transmitting the rotation of said driving shaft to said driven shaft, means for deriving a signal which is in synchronism with the phase of rotation of said driven shaft, means for comparing the phase of the signal which isin synchronism with the phase of rotation of said driven shaft with the phase of said reference signal for thereby deriving a control signal which represents the phase difference between said signals, and means operative in response to the application of said control signal to impart a corresponding brake torque to said driven shaft for thereby automatically varying the engaging position between said torque-transmitting belt and said conical pulley.
- a rotation control device in which said torque-transmitting elastic belt is stabilized at a position slightly protruding beyond one end of said conical pulley when the brake torque imparted to said driven shaft is zero or has a suitable biasing value.
- a rotation control device in which said two conical pulleys disposed in the directions opposite to each other have ,cone angles different from each other, and said torquetransmitting belt is stabilized at a position slightly protruding beyond one end of one of said conical pulleys when the brake torque imparted to said driven shaft is zero or has a suitable biasing value.
- a rotation control device for use in a magnetic recording and reproducing apparatus of the kind having a magnetic tape and a rotary head assembly including therein a plurality of magnetic transducers for the recording and reproduction of a television signalysaid device comprising means for deriving a control signal responsive to the synchronizing signal in said television signal, a single drive source for delivering a drive force to drive both said magnetic tape and said rotary head assembly, said drive source being an AC synchronous motor, a current-controlled stepless speed change mechanism connecting the shaft of said rotary head assembly with the shaft of said drive source, said stepless speed change mechanism comprising a pulley fixedly mounted on the shaft of said rotary head assembly, a pulley fixedly mounted on the shaft of said drive source, at least one of said pulleys being a conical pulley, a torque-transmitting resilient belt trained around said pulleys, and brake means mounted on the shaft of said rotary head assembly, means for deriving a signal which is in synchronism with the phase of rotation of the
- a rotation control device in which one of said pulleys in a conical pulley and the other is an intermediately bulged pulley control said brake means for thereby imparting a brake torque to the shaft of said rotary head assembly and automatically varying the engaging position between said torque-transmitting belt and said conical pulley.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7600066 | 1966-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3562427A true US3562427A (en) | 1971-02-09 |
Family
ID=13592514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US682083A Expired - Lifetime US3562427A (en) | 1966-11-17 | 1967-11-13 | Rotation control device |
Country Status (3)
Country | Link |
---|---|
US (1) | US3562427A (de) |
DE (1) | DE1537245C3 (de) |
GB (1) | GB1201477A (de) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2198208A1 (de) * | 1972-08-29 | 1974-03-29 | Rca Corp | |
US4014040A (en) * | 1973-02-08 | 1977-03-22 | E.M.V. Elektro-Mechanische Versuchsanstalt | Apparatus for automatic track registration |
FR2430700A1 (fr) * | 1978-06-19 | 1980-02-01 | Sony Corp | Appareil pour reproduire un signal video comportant un signal d'adresse sur une bande video defilant a des vitesses differentes |
FR2488024A1 (fr) * | 1980-07-31 | 1982-02-05 | Ampex | Systeme d'asservissement a courants de foucault pour la commande de la rotation de chargeurs de disques |
WO1982000976A1 (en) * | 1980-09-12 | 1982-04-01 | H Dahlgren | Planetary synchronizing device |
US4567824A (en) * | 1980-09-12 | 1986-02-04 | Dahlgren Manufacturing Company, Inc. | Planetary conveyor system |
US4770065A (en) * | 1985-07-22 | 1988-09-13 | Reliance Electric Company | Variable speed drive |
US5271292A (en) * | 1990-11-28 | 1993-12-21 | Canon Kabushiki Kaisha | Robot |
US20050273151A1 (en) * | 2004-06-04 | 2005-12-08 | John Fulkerson | Stent delivery system |
WO2007022395A1 (en) * | 2005-08-17 | 2007-02-22 | C.R. Bard, Inc. | Variable speed stent delivery system |
US20100094399A1 (en) * | 2001-04-30 | 2010-04-15 | C. R. Bard, Inc. | Variable speed self-expanding stent delivery system and luer locking connector |
US20100168756A1 (en) * | 2006-08-07 | 2010-07-01 | Dorn Juergen | Hand-held actuator device |
US20100174290A1 (en) * | 2007-07-11 | 2010-07-08 | C.R. Bard, Inc. | Device for catheter sheath retraction |
US8808346B2 (en) | 2006-01-13 | 2014-08-19 | C. R. Bard, Inc. | Stent delivery system |
US9801745B2 (en) | 2010-10-21 | 2017-10-31 | C.R. Bard, Inc. | System to deliver a bodily implant |
US11026822B2 (en) | 2006-01-13 | 2021-06-08 | C. R. Bard, Inc. | Stent delivery system |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6868A (en) * | 1849-11-13 | Regulator for water-wheels | ||
FR548675A (fr) * | 1922-03-10 | 1923-01-20 | Changement de vitesse pour véhicules automobiles légers | |
US2898772A (en) * | 1957-06-18 | 1959-08-11 | Rufus M Campbell | Variable speed cone pulley drive |
US2941409A (en) * | 1955-10-21 | 1960-06-21 | Richard P Witt | Variable speed power transmission device |
US3168618A (en) * | 1961-08-28 | 1965-02-02 | Fernseh G M B H Darmstadt | Apparatus for recording signals and for reproducing signals recorded on a magnetizable tape |
US3429992A (en) * | 1964-06-06 | 1969-02-25 | Fernseh Gmbh | Apparatus for the recording or playback of electrical signals |
US3431353A (en) * | 1964-08-28 | 1969-03-04 | Sony Corp | Single motor magnetic tape recording and/or reproducing system |
-
1967
- 1967-11-06 GB GB50394/67A patent/GB1201477A/en not_active Expired
- 1967-11-10 DE DE1537245A patent/DE1537245C3/de not_active Expired
- 1967-11-13 US US682083A patent/US3562427A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6868A (en) * | 1849-11-13 | Regulator for water-wheels | ||
FR548675A (fr) * | 1922-03-10 | 1923-01-20 | Changement de vitesse pour véhicules automobiles légers | |
US2941409A (en) * | 1955-10-21 | 1960-06-21 | Richard P Witt | Variable speed power transmission device |
US2898772A (en) * | 1957-06-18 | 1959-08-11 | Rufus M Campbell | Variable speed cone pulley drive |
US3168618A (en) * | 1961-08-28 | 1965-02-02 | Fernseh G M B H Darmstadt | Apparatus for recording signals and for reproducing signals recorded on a magnetizable tape |
US3429992A (en) * | 1964-06-06 | 1969-02-25 | Fernseh Gmbh | Apparatus for the recording or playback of electrical signals |
US3431353A (en) * | 1964-08-28 | 1969-03-04 | Sony Corp | Single motor magnetic tape recording and/or reproducing system |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2198208A1 (de) * | 1972-08-29 | 1974-03-29 | Rca Corp | |
US4014040A (en) * | 1973-02-08 | 1977-03-22 | E.M.V. Elektro-Mechanische Versuchsanstalt | Apparatus for automatic track registration |
FR2430700A1 (fr) * | 1978-06-19 | 1980-02-01 | Sony Corp | Appareil pour reproduire un signal video comportant un signal d'adresse sur une bande video defilant a des vitesses differentes |
US4282552A (en) * | 1978-06-19 | 1981-08-04 | Sony Corporation | Apparatus for reproducing a video signal including an address signal when the video tape moves at various speeds |
FR2488024A1 (fr) * | 1980-07-31 | 1982-02-05 | Ampex | Systeme d'asservissement a courants de foucault pour la commande de la rotation de chargeurs de disques |
WO1982000976A1 (en) * | 1980-09-12 | 1982-04-01 | H Dahlgren | Planetary synchronizing device |
US4567824A (en) * | 1980-09-12 | 1986-02-04 | Dahlgren Manufacturing Company, Inc. | Planetary conveyor system |
US4770065A (en) * | 1985-07-22 | 1988-09-13 | Reliance Electric Company | Variable speed drive |
US5271292A (en) * | 1990-11-28 | 1993-12-21 | Canon Kabushiki Kaisha | Robot |
US20100094399A1 (en) * | 2001-04-30 | 2010-04-15 | C. R. Bard, Inc. | Variable speed self-expanding stent delivery system and luer locking connector |
US8062344B2 (en) | 2001-04-30 | 2011-11-22 | Angiomed Gmbh & Co. Medizintechnik Kg | Variable speed self-expanding stent delivery system and luer locking connector |
US20050273151A1 (en) * | 2004-06-04 | 2005-12-08 | John Fulkerson | Stent delivery system |
WO2007022395A1 (en) * | 2005-08-17 | 2007-02-22 | C.R. Bard, Inc. | Variable speed stent delivery system |
US20070060999A1 (en) * | 2005-08-17 | 2007-03-15 | Michael Randall | Variable speed stent delivery system |
EP2179709A3 (de) * | 2005-08-17 | 2010-06-30 | C. R. Bard, Inc. | Stenteinbringungssystem mit variabler Geschwindigkeit |
US7935141B2 (en) * | 2005-08-17 | 2011-05-03 | C. R. Bard, Inc. | Variable speed stent delivery system |
US8808346B2 (en) | 2006-01-13 | 2014-08-19 | C. R. Bard, Inc. | Stent delivery system |
US11026822B2 (en) | 2006-01-13 | 2021-06-08 | C. R. Bard, Inc. | Stent delivery system |
US9675486B2 (en) | 2006-01-13 | 2017-06-13 | C.R. Bard, Inc. | Stent delivery system |
US20100168756A1 (en) * | 2006-08-07 | 2010-07-01 | Dorn Juergen | Hand-held actuator device |
US9078779B2 (en) | 2006-08-07 | 2015-07-14 | C. R. Bard, Inc. | Hand-held actuator device |
US10993822B2 (en) | 2006-08-07 | 2021-05-04 | C. R. Bard, Inc. | Hand-held actuator device |
US9421115B2 (en) | 2007-07-11 | 2016-08-23 | C. R. Bard, Inc. | Device for catheter sheath retraction |
US8500789B2 (en) | 2007-07-11 | 2013-08-06 | C. R. Bard, Inc. | Device for catheter sheath retraction |
US10206800B2 (en) | 2007-07-11 | 2019-02-19 | C.R. Bard, Inc. | Device for catheter sheath retraction |
US20100174290A1 (en) * | 2007-07-11 | 2010-07-08 | C.R. Bard, Inc. | Device for catheter sheath retraction |
US11026821B2 (en) | 2007-07-11 | 2021-06-08 | C. R. Bard, Inc. | Device for catheter sheath retraction |
US9801745B2 (en) | 2010-10-21 | 2017-10-31 | C.R. Bard, Inc. | System to deliver a bodily implant |
US10952879B2 (en) | 2010-10-21 | 2021-03-23 | C. R. Bard, Inc. | System to deliver a bodily implant |
Also Published As
Publication number | Publication date |
---|---|
DE1537245A1 (de) | 1969-12-11 |
DE1537245C3 (de) | 1973-01-04 |
GB1201477A (en) | 1970-08-05 |
DE1537245B2 (de) | 1972-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3562427A (en) | Rotation control device | |
US4183067A (en) | Helical scan VTR with means for displacing head along track direction | |
US2773120A (en) | Magnetic recording of high frequency signals | |
US5189572A (en) | Magnetic control of a transducer signal transfer zone to effect tracking of a path along a record medium | |
US4161001A (en) | Video signal reproducing apparatus with a manually controlled track searching arrangement | |
US3213204A (en) | Magnetic tape recorder | |
US3646259A (en) | System for recording and scanning video signals on a disc | |
JPH0115937B2 (de) | ||
US3772468A (en) | Capstan phase matching system in an electronic editing mode for magnetic recording and reproducing apparatus | |
US3378646A (en) | Control system for helical scan recorder | |
US3099709A (en) | Tape recorder | |
US4314284A (en) | Video head deflection apparatus for special motion reproduction by helical scan VTR | |
US3419202A (en) | Dual capstan control system | |
US3046463A (en) | Speed regulating apparatus for recording media | |
US3431353A (en) | Single motor magnetic tape recording and/or reproducing system | |
US3487175A (en) | Reversible tape transport with increased tape pressure at high rates of changes in speed | |
US3838451A (en) | Magnetic tape reproducing system having secondary shorting of a rotary transformer for head switching | |
US3636277A (en) | Video tape recorder with single motor-driving head wheel and capstan through respective magnetic clutches | |
US3626115A (en) | Tracking system for a video recorder using an auxiliary dc motor coupled to the capstan | |
US3022383A (en) | Rotatable electromagnetic transducer system | |
US3293359A (en) | Magnetic recording and reproducing devices | |
US3201674A (en) | Eddy current brake to control motor speed | |
US4214259A (en) | Color video tape recorder/reproducer with chrome corrector | |
US3352977A (en) | Helical scan transducer apparatus utilizing time sharing head to minimize distortionduring edge changeover | |
US3429992A (en) | Apparatus for the recording or playback of electrical signals |