US3594009A - Automatic record reproducer apparatus - Google Patents

Automatic record reproducer apparatus Download PDF

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Publication number
US3594009A
US3594009A US663251A US3594009DA US3594009A US 3594009 A US3594009 A US 3594009A US 663251 A US663251 A US 663251A US 3594009D A US3594009D A US 3594009DA US 3594009 A US3594009 A US 3594009A
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US
United States
Prior art keywords
record
turntable
pickup arm
cam
rotation
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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
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US663251A
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English (en)
Inventor
Pedro Sans Cerudo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
V M Corp
VM Corp
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VM Corp
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/08—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records
    • G11B17/12—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis
    • G11B17/16—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post
    • G11B17/162—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post with means for detecting the diameter of the record
    • G11B17/165—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post with means for detecting the diameter of the record with mechanical detecting means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/08—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records
    • G11B17/12—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis
    • G11B17/16—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post

Definitions

  • the invention relates to automatic record 'chan- [54] AUTOMATIC RECORD REPRODUCER I gers adapted particularly for reproducing records of different APPARATUS diameters.
  • the records may be held In lntermlngled stacked 45 Chims, 34 Drawing piga relationship upon a supporting spindle element prior to release for play.
  • a series of cams carried and supported for [52] Cl 4 1 rotation upon a single camshaft functioning with suitable con- 1b 17/16 trols determines the operational sequence control. Rotation of [5 Field of Search 274/ the camshaft and its cams Over a preestablished angle (usually 7 360) controls the operation.
  • Camshaft rotation is interrupted [56] References clted each time the shaft turns through the selected angle. and is UNITED STATES PATENTS then reinitiated either manually or automatically. All normal 3,012,789 12/1961 Rae 274/10 operations are established in known sequence.
  • the present invention relates to a record player device adapted for sequentially positioning records of various and randomly selectable size in stacked relationship for release to a turntable for reproduction, as controlled by a pickup arm and record-tracking stylus.
  • the present invention provides a structure by which the number of operating components has been substantially reduced.
  • the general nature of the drive and control has been simplified through the use of a single cam or cons trol shaft which times and governs each and operation operation of the unit.
  • the structure of the invention provides a multiplicity of cams, all mounted in appropriate angular positions relative to each other, upon a single elongated cam or control shaft.
  • a driven pinion element to control the operation of the complete unit is provided at an appropriate location on the shaft. The pinion is moved to an operative position relative to the rotating record turntable each time a new record is to be reproduced. The transition is automatically achieved with the initiation of a start or following a completion of a record play in order to carry the next record to a play" position.
  • This driven pinion for the cam or control shaft has teeth over the major portion of its periphery to engage a suitable driving element which is preferably on the turntable spindle. It also has a sequence of several adjacent teeth missing along a small portion of its periphery. For the portion of the peripheral arc where teeth are missing, normal engagement between the driving element and the pinion is impossible.
  • the camshaft rotation stops as soon as the driven pinion turns to that position where there are no engaging teeth on the driven unit. Such stoppage occurs during the period of record reproduction.
  • the drive is reinitiated as soon as a new record is ready for play.
  • a tripping mechanism causes the driven pinion to be abruptly rotated, under the release of storedenergy, through an angle sufficient to rotate the unit with its missing teeth for an angle which brings the driving teeth into reengagement with the teeth of the driven pinion element of the turntable.
  • This is achieved through an appropriate type of clutch drive mechanism.
  • the initiated drive then continues until the driven pinion element again turns through an angle sufficient to bring the portion having missing teeth opposite the driving unit. When this condition occurs the drive is once more disengaged.
  • the camshaft drive is always interrupted while records are being reproduced and the pickup arm and stylus are tracking the record grooving.
  • any and various means may be provided to control the several operations.
  • the desired sequence of operation involves a suitable movement of the pickup or control arm from an end-of-play position to a start-of-play position, while making provisions during the movement for utilizing thepickup arm itself to sense the size of the next record to be played.
  • the operation also involves a control of the release of records, one at a time, from a supported stack of randomly chosen sizes, with one record only being released during each rotating of the camshaft.
  • the release of the records individually from a stack held upon a support spindle that is located coaxially with the axis upon which the turntable is driven is preferably achieved by the sequential removal of the lowermost record. Then, after play, and following the operation here briefly outlined the next record in the stack or sequence is selected.
  • the record release is achieved in the preferred apparatus through the movement of a lever positioned within the support spindle which serves in one position to hold the complete stack of records elevated relative to the turntable andin a second position to draw or shift the lowermost record from the stack to a dropped position along the shaft.
  • the lever With the release of the record, the lever is adapted to hold the record to the spindle so that the sensing or pickup arm may determine the record size and then permit the record to drop toa playing position.
  • a further object of the invention is that of providing a simplified structure by which the movements of the pickup stylus and its associated pick-arm can be faithfully carried out in a substantially foolproof manner and still make possible a utilization of the pickup arm itself as a means for record-size testing, thereby to make operation more efficient and yet feasible with a substantially cheaper structure.
  • Still another objective of the invention is that of providing a simplified structure adapted to reproducing records of different sizes which can be driven at different speeds so that the unit is usable with equal facility both for the newest types and size records manufactured, as well as those heretofore used, of which many are still held within the record portfolios of the buying public.
  • Objective still further objective of the invention is that of providing a simplified structure which is capable not only of use with records of different diameters but which, through the addition of a simplified adapter structure, can be used without further modification for reproducing records of relatively small diameter and having a large central guidin hole.
  • objectives of the invention are those of providing a compact, efi'icient, lightweight record changing and reproducing device having a high quality performance characteristic that can be manufactured and sold on a more favorable economic basis than record players now customarily offered to the buying public.
  • FIG. 1 is a general isometric view of the record reproducer looking from above it and showing particularly the pickup arm, the record support spindle and the record compressor positioned relative to the turntable and base member;
  • FIG. 2 is a plan view looking at the turntable and control mechanism from beneath FIG. 1 in the general direction of its line 2-2;
  • FIG. 3 is a plan view of the record reproducer in approximately a neutral position looking at the structure in the general'direction of the line 3-3 of FIG. 1 with the turntable removed and the general control mechanism of FIG. 2 shown in phantom;
  • FIG. 4 is a view of generally schematic form of the FIG. 2 components looking from the same general direction with some components shown in slightly out-of-phase relationship for descriptive purposes;
  • FIG. 5 is also a generally schematic view of the start-control unit looking at the mechanism with the turntable removed;
  • FIG. 6 is an exploded view, somewhat in schematic layout, particularly showing the general operative relationship of selected components thereby depicting the general operative sequence as particularly emphasized by the dot-dash lines showing more specific relationship;
  • FIGS. 7a and 7b represent sections taken on the line 7-7 of FIG. 3, with FIG. 70 showing the clutch control in a neutral and energized state prior to initiation of rotation of the camshaft, and with FIG. 7b showing the initiation of camshaft rotation as controlled by the release of the stored drive ener- 83/;
  • FIGS. 8a and 8b represent the camshaft dn've pinion, as seen along the line 8-8 of FIG. 3, showing a neutral position (corresponding to that of FIG. 7a and FIG. 8a) and in a driving position, as in FIG. 8b, after camshaft rotation has been initiated by the released drive (corresponding to FIG. 7b);
  • FIG. 9 shows by its various parts a through d the record support and locating spindle, with FIG. 9a being an elevational 7 view with the spindle lever in a generally neutral position and '7 a stack of records supported thereon for release in sequence, FIG. 9b being an elevational view showing the rocking lever moved to release the lowermost record of the supported stack to a size-testing position between the supported stack and the record turntable, FIG. 9c being an elevational sectional view of the spindle to show particularly the rocking lever for controlling the record release and position, and FIG. 9d being a cross section on the line 9d-9d of FIG. 90;
  • FIG. 10 is an elevational view seen in general direction of line 10-10 of FIG. 3 to show the elevating and rotating cam controls for the pickup arm;
  • FIG. 11 is a simulated isometric exploded view of the pickup arm and the position-locking arm as seen substantially along the line 11-11 of FIG. 10 when looking in the direction of the arrows;
  • FIG. 12 is an isometric view of the driving cam and control disc for controlling pickup arm movement with the view taken generally along the section 12-12 of FIG. 10;
  • FIG. 13 is an end view of the pickup arm elevating rod and the control cam as seen along section 13-13 of FIG. 10 looking in the direction of the arrows;
  • FIG. 14 is an isometric view as seen generally along the path 14-14 of FIG. 10 when looking in the direction of the arrows and shows the cam control to move the pickup arm away from the record turntable and the record support and positioning spindle;
  • FIG. 15 is an elevational view, partly in section, taken along line 15-15 of FIG. 10 looking in direction of the arrows and illustrates the record support spindle and supported records in use with the record compressor arm to maintain the stack position;
  • FIG. 16 is an exploded isometric view along support axis of pickup arm to show movement control and control elements driven thereby to control operational cycle in part;
  • FIG. 17 (appearing on sheet 9 with FIGS. 12 to 14) represents by its parts X and I through IX, respectively, the
  • FIG. 18 is a plan view of the tone arm rotated to the turntable and supported record with the pickup shown in its rest position and then in phantom in positions of record size sensing, start of record play and end of record play;
  • FIG. 19 is a sectional view taken on the line 19-19 of FIG. 10 looking in the direction of the arrows to show the control by which the pickup arm is elevated and turned.
  • FIG. 20 by its parts a and b represents sections taken along the line 20a looking from the direction of the line with FIG. 20a showing the unit adapted for one playing speed and FIG. 20b showing the unit adapted for a different speed.
  • FIG. 21 by its parts (a) and (b) shows an adapter in sectional elevation to enable the device shown by FIGS. 1
  • FIG. 22 is a sectional bottom view along the path of line 22-22 of FIG. 21a looking in the direction of the arrows;
  • FIG. 23 by its part FIG. 23a is a view of the cylinder with the top turret removed and looking in the direction of arrows 23a of FIG. 21a and part FIG. 23b, is a top view of the turret looking along line 23-23 of FIG. 21a to show the adapter turret and spindle with its record displacing cam element;
  • FIG. 24 in its parts FIG. 24a and FIG. 24b constitutes a chart to show the operation sequence of the various components, with time shown as extending from left to right and angular rotation of the camshaft similarly depicted, with each individual operation shown as effective for that portion of the camshaft rotation shown above each datum line for each depicted operation step.
  • This is for convenience of showing the broad operational principals and the general timing of the events. No inference should be made from these curves relative to the precise operating times since some events start and end faster than others.
  • the chart is intended to present general arrangements only and is merely to aid in understanding the timing of different events; and
  • FIG. 25 is an enlargement of the upper portion of FIG. 21a to show the manner of removal of the bottom record of the stack by the lever-operated slide element.
  • FIG. 1 constitutes a generally isometric view of the unit as it would be viewed from the top in its operation.
  • the turntable ll lIS. supported for rotation on a base 12 to turn on an axis 13.
  • This axis of rotation is generally centered on the base member 12 which is depressed in its central portion to accommodate the turntable 11.
  • the support axis provides for the turntable being rotated in any suitable fashion by a suitable and selected form of drive.
  • the general turntable drive will be seen particularly from FIGS. 2 and 3. It is provided by a motor, schematically indicated at 14, which is adapted to drive a puck element 15 in any suitable fashion (not shown).
  • the puck is rotated by the motor and is positioned and held internally of the downwardly extending rim 16 of the turntable 11. With rotation of the puck, the turntable is also appropriately rotated.
  • the turntable is adapted to be driven at different speeds, each of which is essentially constant, depending upon the type and size of the record to be reproduced.
  • the control knob 17 has been schematically represented so that, if turned, it may be assumed that the puck is made to contact one of a plurality of different diameter sections of the rotor shaft of the motor.
  • the ratio between the circumference of the different motor shaft areas of contact with the puck circumference sets the speed at which the turntable can be driven. There is speed reduction between each of the circumference of all of that of the motor rotor shaft the puck and the turntable.
  • the driving motor is appropriately a constant speed unit so that different turntable speeds result when the driven puck contacts the rotor shaft at regions of different diameter.
  • the records for reproduction are rotated at speeds of 33% rpm. for present day records of both the inch and 12 inch types, 78 r.p.m. for older records, particularly of the 10 inch and 12 inch variety and 45 rpm.
  • the knob 17 is adapted to set the record turntable speed by a cam action shifting the puck to contact different diameter sections of the motor shaft as it is driven. This will later be explained in further detail.
  • the support shaft 13 for the record turntable is usually of tubular variety so that a spindle element 18 may be supported and positioned internally thereof.
  • the spindle (as will be more particularly described in connection with FIGS. 90 through 9d inclusive is provided with an internal pivotal lever element 19 adapted to pivot about the pin 20 as an axis. The pivotal movement is controlled by means of the outer end 21 of the lever.
  • the end 2] acts as a cam follower and is adapted to be moved in a manner later to be described.
  • the pivotal lever 19 extends upward internally of the spindle. Toward the upper portion the spindle provides shoulder or guide shelf 22 upon which a stack of records 23 (see FIG. 9a) is adapted to rest.
  • the upper portion of the spindle has an upper slidable holder member 24 (see FIG. which is adapted to slide about the guide pins 25 and 26 by way of the slot 27, thereby to hold and position supported records prior to their being dislodged from the guide shelf and the set spring element 28.
  • the spring element 28 extends internally from the upper part of the pivoted lever 19 and terminates at about the level of the shoulder or guide shelf 22, thereby to aid in holding the lowermost record of the stack 23.
  • the records thus supported are adapted for play by being dropped to the turntable in a fashion later to be explained.
  • the record grooves are adapted to be contacted by the stylus element 30 (see FIG. 18) which is supported near the outer end 31 of the pickup arm 32.
  • the pickup am 32 is pivotally supported and mounted at its rear portion 33 so as to be raised from the surface of the record on the turntable at the time of completion of record play and to be lowered to the turntable and the record at the time when record play is started, to so remain until record play is completed.
  • Arcuate movement about the support is also provided, thereby to permit tracking the record across the record face.
  • the record compressor arm 34 Whenever a stack of records is held upon the spindle 18 and supported in the fashion already stated by the shoulder 22 and the spring element 28, the record compressor arm 34 through its outwardly extending fingers 35 and 36 rests upon the uppermost record. As is well known, the arm 34 thereby serves as a stabilizing component.
  • the holder-compressor arm 34 is supported from one end upon a spindle 37 which extends downwardly into a holder 38 (see FIG. 15).
  • the holder 38 serves both to guide the spindle and, in a manner later to b5 described, arrest further downward movement of the pickup or tone arm.
  • a pin 39 extends outwardly from the spindle in substantially a radial direction. The pin locates the position of the compressor arm.
  • the pin 39 is adapted to move downwardly into the slot 40 (see FIG. 18) with the playing of the records, while the spindle 37 moves within the holder 38. At a time when the last record of the stack has been released the spindle 37 is at its lowest position.
  • the operation is stopped when the end of the locking arm contacts a notch of a disk element secured to the spindle which supports the pickup arm, as will later be described.
  • the pickup or tone arm 32 is in a rest position and prior to starting the mechanism, it is adapted to be positioned and rest upon the support post 41. It can be locked in this position by a lateral movement of a suitable locking button 29 pushed in one position and released when the button is in the opposite position.
  • a hollow shaft member 13 which extends up through the turntable base.
  • This shaft is mounted at its lower end in a bracket 44 which is hung from the lower side of the base member 12 by appropriately supporting ears 45 and 46.
  • the upper surface of the base member has a circular depression or recess formed therein into which thetumtable element 11 is adapted to be positioned. From the underside, this recessed section extends downwardly.
  • the supporting ears 45 and 46 of the bracket 44 are attached to such under side, as can be seen from the exploded view of FIG. 6.
  • the bracket 44 extends beneath the bottom of the recessed portion into which the turntable fits. There it forms a supporting structure for holding one end of a cam shaft 50 which serves as a unitary control shaft for establishing essentially the operation of the entire unit.
  • the camshaft 50 extends through a bearing surface 51 in a protruding tab 52 which extends outwardly from one of the upright sections 53 of the bracket 44.
  • the camshaft 50 extends from a position in the bearing sup port substantially along a generally diagonal path beneath the base of the unit. At its remote end it is supported in the upstanding section of a bracket 54 which, in turn, is also supported by an angle section 55 from the lower portion of the base 12.
  • the turntable element 11 is supported at its center and a hollow shaft 56 of an inside diameter sufficient to slide over and position the turntable on and about the hollow spindle 13.
  • This hollow section may be appropriately secured to the turntable in any desired fashion. It extends down slightly from the lower turntable surface.
  • the hollow shaft 56 terminates at its lower end in a worm element XI.
  • the lower end of the hollow shaft 56 is adapted to rest over and be positioned upon a bushing member (not shown) supported from the upper surface of the bracket 44 through which bushing the spindle 13 is adapted to protrude to be held at its lower end by a fastening nut 57 supported immediately beneath the bracket and threading on to the threaded end 58 of the spindle 13.
  • the spindle 13 with the worm surrounding it provides a spacing element between the lower side of the frame and the upper portion of the bracket. It also limits the position of the worm XI.
  • the worm XI is keyed to the shaft 56 and thereby turned through the turntable.
  • the worm is adapted to mesh with and drive a pinion X that is located along the camshaft 50 in a position of engagement with the worm. Accordingly, with engagement between the teeth of the worm XI and the pinion X, assuming the pinion to be keyed to the camshaft 50, as is the case, camshaft rotation is by the drive motor 14 and puck 15.
  • cam or control shaft 50 is in a position to be turned by the drive provided through pinion X
  • a multiple series of cams supported upon and keyed along the shaft.
  • the cams are so located and their followers are arranged in such relationship that for each 360' rotation of the camshaft the rotating cams provide for the operation of all control features necessary for the control of a full change of records for reproduction and the interchange of records from a stacking position to a playing position on the turntable 11.
  • FIG. 6 depicts the various components and the approximate relative relationship of each so as to show in a most general sense the functioning and relationship of the various component parts herein to be described.
  • nine separate cam elements schematically represented by the Roman numerals I through IX, are provided on the shaft 50.
  • Each of these cams is shown in more detail by FIG. 17 where each is turned to appropriately the angular relationship which each cam bears to each other cam on the camshaft so that the desired operational sequence is achieved.
  • the camshaft 50 is provided throughout its length with a longitudinally extending groove 62.
  • Each of the cams I through IX, as well as the driven pinion X, is provided with an outwardly extending projection or spline 63 which is adapted to fit within such elongated slot or guide 62.
  • the slot and spline thereby set the precise angular position of each cam relative to each other cam.
  • Any appropriate form of longitudinal spacing components such as spacing rings and setscrews, or any other form of recognized spacing unit, may be provided to maintain the desired longitudinal spacing of all of the cams between the two ends of the shaft.
  • the constructural features make it desirable in some instances for certain cams to be positioned adjacent or substantially'adjacent to each other. In other instances, the cams may be spaced appropriately along the camshaft. Because wide variances in constructural features are contemplated, the particular spacing illustrated in any of the drawings should be regarded as generally schematic although exemplary of a preferred embodiment of the invention. However, in the exploded view of the character of FIG. 6,'the cam spacings and shapings must be regarded as generally schematic. A more precise reference to the cam shapings is found in the various cams of FIG. 17. The relative angular positioning of the several cams is also set out with close approximation to that most preferred. In the showing of FIG.
  • cams as well as the driven pinion X, are all positioned in a neutral relationship with respect to operation. This is to say that a record is in the play" state and no shift is under way at the depicted time.
  • the cam followers have not been depicted generally in a precise following relationship in either of FIGS. 6 or 17 although it is to be noted that the exploded schematic view of FIG. 6 shows generally the components which act as followers for the majority of the cams.
  • Operation and rotation of the camshaft 50 is initiated by providing an abrupt rotation through an external activating means capable of rotating the shaft 50 through an angle adequate to turn the mutilated gear sufficiently to move the first tooth of the driven pinion X into a position to make contact with the teeth of the driving worm XI.
  • an external activating means capable of rotating the shaft 50 through an angle adequate to turn the mutilated gear sufficiently to move the first tooth of the driven pinion X into a position to make contact with the teeth of the driving worm XI.
  • this is shown as being about 15 but this must be regarded as illustrative of principle and not a structural limitation.
  • the drive motor 14 is in operation to turn the drive puck 15 through the motor shaft and thereby rotate the turntable 11 and, with it, the worm XI.
  • the worm XI is rigidly secured to the turntable shaft and rotates at all time that the turntable is driven.
  • the jogging motion of the camshaft 50 is provided by means of a generally triangular-shaped cam III, appropriately keyed to the camshaft.
  • the cam III In a rest or neutral position, the cam III is supported so that it is substantially adjacent to a depending bracket 66.
  • the bracket is secured at 67, in turn, to a sliding plate member 68 which is, in turn, supported to rest in part upon the upper surface of the base member 12.
  • a downwardly turned end of the sliding member 68 extends through a slot 69 in the base member 12.
  • the downwardly depending portion then connects by the pin connection 67 with the channel section 70 which has the already mentioned downwardly depending portion 66 on one side and a second downwardly depending section 71 on the other side.
  • the channel section 70 has its downwardly de-

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US663251A 1966-09-08 1967-08-25 Automatic record reproducer apparatus Expired - Lifetime US3594009A (en)

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ES33099666 1966-09-08

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US (1) US3594009A (fr)
CH (1) CH465259A (fr)
DE (1) DE1572450A1 (fr)
FR (1) FR1549311A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773332A (en) * 1971-04-21 1973-11-20 Bsr Ltd Automatic record players
US3826504A (en) * 1971-05-13 1974-07-30 Bsr Ltd Automatic record players
US4470136A (en) * 1980-11-19 1984-09-04 Pioneer Electronic Corporation Automatic record disc loading players

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012789A (en) * 1956-05-11 1961-12-12 Emi Ltd Gramophone record playing apparatus
US3044782A (en) * 1957-05-31 1962-07-17 Hansen Hans Christian Spindle with feeder position record changing phonographs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012789A (en) * 1956-05-11 1961-12-12 Emi Ltd Gramophone record playing apparatus
US3044782A (en) * 1957-05-31 1962-07-17 Hansen Hans Christian Spindle with feeder position record changing phonographs

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773332A (en) * 1971-04-21 1973-11-20 Bsr Ltd Automatic record players
US3826504A (en) * 1971-05-13 1974-07-30 Bsr Ltd Automatic record players
US4470136A (en) * 1980-11-19 1984-09-04 Pioneer Electronic Corporation Automatic record disc loading players

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Publication number Publication date
CH465259A (fr) 1968-11-15
FR1549311A (fr) 1968-12-13
DE1572450A1 (de) 1970-07-30

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