US2979337A

US2979337A - Phonograph

Info

Publication number: US2979337A
Application number: US604695A
Authority: US
Inventors: Willard J Faulkner; Jack E Bayha
Original assignee: VM Corp
Current assignee: V M Corp; VM Corp
Priority date: 1956-08-17
Filing date: 1956-08-17
Publication date: 1961-04-11
Anticipated expiration: 1978-04-11

Description

Apnl 11, 1961 w. J. FAULKNER ETAL 2,979,337

PHONOGRAPH Filed Aug. 17, 1956 5 Sheets-Sheet 2 Q E VIII/111111 =JL/E-I/I 4: (III/1111147111 20 48 2'4 52 as T 5'6 26 us FI 3L IN VEN T 0R5. WILLARD J. FAULKNER JACK E. BAYHA B Y ya, fl/w wa ATTORNEYS April 1961 w. J. FAULKNER ETAL 2,979,337

PHONOGRAPH 5 Sheets-Sheet 3 Filed Aug. 17, 1956 INVENTORS. WILLARD J. FAULKNER JACK E. BAYHA ATTORNEYS April 11, 1961 w. J. FAULKNER ETAL 2,979,337

PHONOGRAPH Filed Aug. 17, 1956 5 Sheets-Sheet 4 INVENTORS. WILLARD J. FAULKNER JACK E. BAYHA ATTORNEYS April 1961 w. J. FAULKNER ETAL 2,979,337

" PHONOGRAPH Filed Aug. 17, 1956 5 Sheets-Sheet 5 IN V EN TORS. WILLARD J. FAULKNER PI 12 JACK E. BAYHA ATTORNEYS United States PatentO PHONOGRAPH Willard J. Faulkner, Coloma, and Jack E. 'Bayha, Benton Filed Aug. 17, 1956, Ser. No. 604,695 '19 Claims. (Cl. 274-) The present invention relates to a phonograph, and more particularly to a portable record-changing mechanism uniquely compact and simple in design.

It is an object of this invention to provide a phonograph mechanism which automatically changes and plays a series of records sequentially.

Still another object of this invention is to provide an automatic phonograph mechanism which is simple in design, reliable in operation, and economical to construct.

It is still another object of this invention to provide an automatic phonograph construction which is unique in the respect that it is especially adapted for portable use.

Other objects will become apparent as the description proceeds.

To the accomplishment of the above and related objects, our invention may be embodied in the forms illustrated in the accompanying drawings, attention being called to the fact, however, that the drawings are illustrative only, and that specific change may be made in the specific constructions illustrated and described, so long as the scope of the appended claims is not violated.

In the drawings:

Fig. 1 is a part-sectional illustration, in plan view, of a phonograph with portions of the turntable being omitted for purposes of clarity and parts thereof being shown in two different operating positions;

Fig. 2 is a sectional illustration taken substantially along section line 2-2 of Fig. l, the turntable and drive mechanism being removed for purposes of clarity;

Fig. 3 is a cross-sectional illustration of the mechannism of Fig. 1 taken substantially along section line 33;

Fig. 4 is a top plan view of the phonograph with certain parts being shown in section;

Fig. 5 is a cross-sectional illustration, taken substantially along section line 5-5 of Fig. 4, showing essentially only the turntable construction;

Figs. 6 and 7 are plan views of the slicer blade construction shown in assembled detail in Fig. 4;

Fig. 8 is a fragmentary plan view of the phonograph 7 base showing the guide rail construction; 7

Fig. 9 is a plan view of the cam plate construction;

Figs. 10 and 11 are fragmentary illustrations of portions of the mechanisms illustrating the record-playing and record-changing portions of certain of the operating parts; and

Fig. 12 is an illustration of that portion of the mechanism which directly actuates the tone arm.

Referring to the drawings, and more particularly to Figs. 1, 2, 3 and 8, the phonograph of this invention comprises a chassis or base 20 having a motor and tone arm housing 22 on one side thereof. In the central portion of the base, and preferably integral therewith, are two C-

shaped guide rails

24 and 26 concentrically arranged about a common center indicated by the reference numeral 28. Two

spaces

30 and 32, respectively, are provided between the adjacent ends of the two

rails

24 and 26, and because of the particular purpose of these spaces, they will hereinafter be characterized as gates. transversely inwardly from the gate 30 end of the rail 24 is an extension or deflector 34. A like extension or deflector 36 extends radially outwardly from the end of the rail 26 adjacent the gate 32. A pivot post 38 projects upwardly from the base 20 and is concentric about the center 28. A spindle 40 which supports the turntable (to be described later) for rotation is secured in the post 38 in an eccentric position, as is more clearly illustrated in Fig. 8.

The housing 22 on the base contains therewithin the phonograph motor and turntable drive mechanism, as indicated by the reference numeral 42 (see Figs. 1 and 4). An opening or window 44 is provided on the inner side of the husing 22 for receiving the phonograph tone arm, as indicated by the reference numeral 46 (Figs. 1 and 2).

Mounted for rotation on the stationary post 38 is an eccentric cam plate 48, as is best shown in Figs. 1, 2, 9, l0 and 11. Particularly referring to Fig. 9, the cam plate is essentially a circular sheet metal disc which is eccentric with respect to point 28. Struck upwardly from the cam plate 48 are two arcuately spaced

lugs

52 and 54, respectively, which are spaced from the two centers 28 and 40.,in a manner which will become apaprent from the following description.

Mounted on the cam plate by means of a pivot pin or rivet 56 is a cam-operating lever 58 having a vertically arranged tripping finger 60 on the end thereof which projects above and below the cam plate through an arcuatelyshaped slot 62. On the other end of the lever 58 is another tripping finger 64 which projects upwardly. The pivotal connection 56 is sufliciently loose as to allow the lever 58 to swing freely within the limits permitted by the slot 62.

. In Fig. 1 the cam plate 48 is shown in two different positions of rotation about the post 38 by the solid and dashed line figures, which are designated by the

reference numerals

48 and 48a, respectively. .It should be understood that the cam plate 48 is freely rotatable on the pivot post 38.

Having now described the base 20, its associated

guide rails

24, 26 and the

cam plate assembly

48, 58 mounted on the base, the next in order of assembly and logical description is the turntable 66. This turntable is discshaped, having an upstanding, tubular post 68 in the center thereof. As will be recognized from the drawings, this post 68 is of the larger diameter type especially adapted for playing the conventional 45r.p.m. disc-type records.

A suitable bearing 70, which is secured by any suitable means to the turntable 66, rotatably receives the eccentrically positioned spindle 40 for rotatably mounting the turntable on the base 20. In the upper end of the spindle 68 are provided 'two diametrically opposed Windows 72 and 74 which receive for reciprocation therein a set of slicer blades, generally indicated by the reference numeral 76, which is adapted to support a stack of records and drop such records sequentially on the turntable 66. These slicer blades are shown in detail in Figs. 6 and 7 as comprising one blade 78 having two oppositely extending

fingers

80 and 82 and another blade 84 having two pairs of oppositely extending

blades

86 and 88. Both

blades

78 and 84 are provided with

identical slots

90 and 92, respectively.

Blade 78 has a laterally extending ear 94, and blade 84 has a similar but oppositely disposed ear 96. In assembly, the blade 78 is superposed on the blade 84 with the slots '98 and 92 in registry and slidably fitting over a mounting screw 98 which is secured into the upper end of the bearing 70. Both blades are thus free to recip- Extending be that of Fig. 11 during'the record-changing cycle, the cam plate 48 will remain at rest while the block 114 makes a complete revolution before picking up the finger 64). During this period of relative rotation between the block 114 and finger 60, the star wheel 112 will be carried past the lug 52 which causes ninety degree (90) rotation of the wheel 112, after which the wheel also engages the lug 54 for producing another ninety degree (90) rotation. As explained earlier in connection with the slicer blade assembly 76 of Figs. 4 and 5, a total of one hundred eighty degrees (180) of rotation of the star wheel 112 results in dropping the lowermost record of a stack of records onto the turntable.

Recapitulating briefly, during a record-changing cycle, the cam plate 48 is turned one-half /2) revolution by the turntable. At theend of this one-half revolution, the engagement between the turntable and the cam plate is broken, whereupon the turntable freely rotates one (1) revolution while the cam plate 48 is at rest. During this one revolution of the turntable, the star wheel '112 is rotated to drop the lowermost record of a stack of records on the turntable post 68. Immediately following the dropping of this record during this single revolution, the turntable picks up the cam plate and returns it to its original position. Thus, the cam plate moves through two (2) distinct one-half /z) revolutions for each record-changing cycle.

The tone arm actuating mechanism is more clearly illustrated in Figs. 1, 2 and 12, which will now be referred to in detail. The tone arm 46 of conventional construction and which is provided with the usual phonograph needle or transducer is mounted for limited universal movement on a vertical shaft 140 and a horizontal hinge pin 142 which passes through the shaft 140. The shaft 146 is disposed inside the housing 22 so that the tone arm 46 may be completely retracted intothe housing or swung outwardly therefrom into record-playing position. i

On the lower end of the shaft 140 is secured ahorizontally extending lever 144 (Fig; 2) which is engageable by a preformed set-down spring 146 which is secured at one end to the base 20. The other end of the spring, indicated by the reference numeral 148, passes upwardly through a clearance opening 156 in the base 20 into 'abuttable relation with the tone arm lever 144. The spring 146, the clearance aperture 150, and the lever 144 are so related that the spring 146 rotates the lever 144 to a position at which the tone arm will be placed in registry with the lead groove of a record to be played. Thus, it is the position of the clearance aperture 1 6 which determines the set-down position of the tone arm 46.

A control arm or crank 152 is secured to the rear end 154 of the tone arm 46 and passes downwardly through an enlarged clearance opening 156 in the base 20. The lower end of the crank is preformed to be essentially parallel with the base when the tone arm 46 is lifted to its illustrated position in Fig. 2, with the left end thereof being bent downwardly as shown in Fig. 2. The tip end of this bent portion is given the reference numeral 158 for use in explaining the operation of this portion of the mechanism.

Since the tone arm 46 is movable vertically about the hinge pin 142, the crank 152 is'correspondingly movable as shown in dashed line form (Fig. 2). It will now be apparent that by manipulating the crank arm extremity 158, it is possible to raise and lower the tone arm 46. It will also be apparent that the tone arm can be swung about its pivot post 140 by swinging the crank arm 152. Thus the crank 152 should be considered as'the instrument by which the tone arm is moved into and out of record-playing position.

Pivotally mounted on the base about a suitable pivot post 160 is a follower arm 162 which carries on one end a roller or cam follower 164 which is engageable with the perimeter of the cam plate 48 and'on its 'otherend a tone arm-actuating spring 166 which is preformed to the solid line shape as shown in Fig. 12. The actuating,

spring 166 is so positioned as to be operatively engageable with the crank end 158. 7

Considering Fig. 12 for the moment, two alternative positions of the follower arm 162 and related mechanism are represented by solid and dashed line figures, respectively, the dashed line figures being designated by the same reference numerals with the suffix a. With the cam plate in the solid line position 48, the follower arm 162 will assume its solid line position. In the dashed line position of the follower arm 162a, which corresponds to the eccentric position 48a-of the cam plate, the spring 166 will be moved into engagement with the crank end 158. It is the movement of the follower arm between the two extreme positions of the

follower arm

162 and 162a which resultsin operation of the tone arm during a record-changing cycle, as will now be explained in detail.

For explanation of operation, it is assumed that the record changer is started by manually rotating the turntable 66 thereby to initiate operation of the reject lever 118 and rotation of cam plate 48. At the start of a record changing cycle, cam plate 48 is in its position 48a and as it moves from this position the follower arm 162 commences to move in a counterclockwise direction. Such movement eases the pressure of spring 166 on the crank end 158 permitting the set-down spring 146- to move crank end 158 and therewith the tone arm inwardly from position 158s toward the record and position 1580. (Fig. 12).

Further counterclockwise movement of lever 162 decreases the pressure of spring 166 on crank end 158 thereby allowing crank end 158 to move from position 158d in the direction of arrow D to position 158a where in the tone arm will have been lowered into contact with the initial playing groove of the record. As previously xplained, the cam plate 48 assumes the position during record playing as illustrated by the solid line representation 48 of Fig. 1, so that the follower arm 162 (Fig. 12) assumes the position as represented by the solid line representation. As the period of record playing progresses, the tone'arm moves inwardly toward the center of the record carrying with it, in the direction of arrow A of Fig. 12, the crank end 158. When the tone arm reaches the inner or reject groove of the record, the crank end will reach the position 158]]. Simultaneously with reaching this position, the tone arm lever 144 (Fig. 2) engages the vertical portion of the reject-link 122, there by pushing it inwardly into contact with the tripping lug 64 of the cam-operating lever58. This immediately initiates movement of the cam plate 48 for one-half (V2) revolution to the position of 48a as seen in Fig. 12. In moving to this new position, the follower arm 162 is progressively moved to the dashed line position of 162a, during which movement the portion 163 of the spring engages the crank end 158, moving it in the direction of the arrow B to the position 1580. 'In moving the crank and from the position 158b to 158C, the tone arm is lifted off the record, but just prior to reaching this position 1580, the spring 166 will have bent sufliciently to allow the crank end 158 to pass over the coil 170 of the spring 166, whereupon the portion 172 of the spring will engage the' crank end; This will move the crank end in the direction of the arrow C from the position 1580 to 1582, this movement maintaining the tone arm lifted and also swinging the tone arm back into the housing 22 as shown in .Fig. 1. Since the cam plate 48 is heldin the position 48a for a short period of time while the record changer drops a new record on the turntable, the tone arm will be maintained retracted inasmuch as the spring 166 holds the crank end in the position 158e.

When the record-changing cycle has been completed, the cam plate 48 is rotating one-half /z) revolution to the solid line position of Fig. 12, whereupon the follower arm 162 is retracted, i.e., swung counterclockwise to the solid line position, allowing the crank end 158 to swing drop to position 158d and then to move along the path of the arrow D to the starting position 158a. Thus completes a cycle of playing one record completely and effecting a change of records and starting the playing of a new record.

The phonograph mechanism is powered by means of the driving mechanism 42 comprising an electric motor 174 (Fig. 4) and an idler wheel 176 which engages the outer rim of the turntable 66. In the usual manner, the idler Wheel 176 is engaged and rotated by the shaft of the motor 174, so that energization of the motor results in rotation of the turntable. Since the speed of the turntable rotation is critical, it is of course necessary that the speed of motor 174 and the size of idler wheel 176 be properly selected for producing the necessary speed of turntable rotation. Since any well-known driving mechanism may be used in conjunction with this invention, it is not necessary to describe or discuss further a suitable mechanism;

In brief summary, rotation of the turntable 66 by means of a suitable driving mechanism 42 serves in actuating both the record-changing and tone arm-operating mechanisms of this invention, the feature of this invention making this mode of operation possible being the selective connections (blocks 114 and 116) between the turntable and the cam plate 48.

By selective operation of the cam-operating lever 58, the driving force of the turntable may be imparted to the cam plate 48 for (l) changing records and (2) retracting the tone arm from playing position to permit record changing and then setting the tone arm down in registry with the lead groove of the record to start a new playing cycle. Thus, the turntable itself may be regarded as the source of power for operating the entire mechanism.

What is claimed is:

1. A phonograph mechanism comprising a tone arm mounted for limited universal movement and including a control arm, a cam follower operatively associated with said control arm for moving said tone arm in both vertical and horizontal directions for predetermined distances, a cam for actuating said cam follower, a selectively movable element mounted on said cam, a positiondetermining device operatively associated with said movable element for selectively positioning said element, a turntable, and a pick-up member carried by said turntable, said pick-up member being selectively engageable with said movable element for operating said cam.

2. A phonograph mechanism comprising a chassis, a

tone arm mounted on said chassis for limited universal movement and including a control arm, a cam follower operatively associated with said control arm and movably mounted on said chassis and operatively engageable with said tone arm for moving said tone arm selectively in vertical and horizontal directions, a cam mounted for movement on said chassis and having an operative connection with said cam follower, a selectively movable element mounted on said cam, a turntable, and a pick-up member carried by said turntable, said pick-up member being selectively engageable with said movable element for operating said cam.

3. A phonograph mechanism comprising a chassis,

a tone arm mounted on said chassis for limited universal movement and including a control arm, a cam follower operatively associated with said control arm and movably mounted on said chassis and operatively engageable with said tone arm for moving said tone arm selectively in vertical and horizontal directions, a cam mounted for movement on said chassis, a selectively movable element mounted on said cam, a turntable, a pick-up member carried by said turntable, said pick-up member being selectively engageable with said movable element for 25 operating said cam, and actuating mechanism operatively interposed between said tone arm and said movable element for causing operative engagement of said member with said element for actuating said cam.

4. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for limited universal movement, a cam follower movably mounted on said chassis and operatively engageable with said tone arm for moving said tone arm selectively in vertical and horizontal directions, a cam mounted for movement on said chassis and having an operative connection with said cam follower, a movable element on said cam, a turntable on said chassis, a pick-up member on said turntable selectively engageable with said movable element for operating said cam, record-changing mechanism operatively associated with said turntable and a position-determining device on said chassis for disengaging said movable element from said pick-up member after said tone arm has been moved.

5. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for limited universal movement, a cam follower movably mounted on said chassis and operatively engageable with said tone arm for moving said tone arm selectively in vertical and horizontal directions, a cam mounted for movement on said chassis and having an operative connection with said cam follower, a movable element on said cam, a position-determining device on said chassis for controlling the position of said movable element, a turntable on said chassis, a pick-up member on said turntable selectively engageable with said movable element for operating said cam, first means on said turntable for supporting a stack of records, and second means on said turntable cooperatively engageable by said cam for changing said records one at a time.

6. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for limited universal movement, a follower arm pivotally mounted on said chassis for actuating said tone arm, an eccentric cam rotatably mounted on said chassis operatively engaging said follower arm, a lever swingably mounted on said cam for selective movement to one of two possible positions, a guide rail on said chassis operatively engaging said lever for moving the latter selectively to said positions, and a pick-up member on said turntable which is selectively engageable with said lever for operating said cam.

7. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for limited universal movement, a follower arm pivotally mounted on said chassis for actuating said tone arm, an eccentric cam rotatably mounted on said chassis operatively engaging said follower arm, a lever swingably mounted on said cam for selective movement to one of two possible positions, a guide rail on said chassis operatively engaging said lever for moving the latter selectively to said positions, a pick-up member on said turntable which is selectively engageable with said lever for operating said cam, record-changing mechanism on said turntable, and an actuating device on said cam operatively engageable with said record-changing mechanism for changing records one at a time.

8. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for limited universal movement, a follower arm pivotally mounted on said chassis for actuating said tone arm, an eccentric cam rotatably mounted on said chassis operatively engaging said follower arm, a lever swingably mounted on said cam for selective movement to one of two possible positions, a guide rail on said chassis operatively engaging said lever for moving the latter selectively to said positions, a pick-up member on said turntable which is selectively engageable with said lever for operating said cam, record-changing mechanism on said turntable, an operating element for said mechanism which is rotatable with said turntable, and an actuating memberon said cam selectively engageable with said operating element for actuating said record-changing mechanism.

9. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for vertical and horizontal movement, a cam follower movably mounted on said chassis and operatively engageable with ,said tone arm for moving said tone armvertically and horizontally, a cam mounted for movement on said chassis and operatively associated with said cam follower, a turntable mounted for vertical and rotary movement on said chassis, a pick-up member-fixed to the lower side of said turntable and over said cam for driving said cam from said turntable, a movable element on said cam in the path of movement of said pick-up member, a position determining device on said chassis and operatively associated with said movable element for positioning said movable element in the path of movement of and in operative engagement with said pick-up member, said position determining device including friction means disposed to engage the rim of said turntable when it is moved vertically to a lowermost position, and record changing mechanism operatively associated with said turntable and said cam for operation by said turntable and cam.

10. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for vertical and horizontal movement, a cam follower movably mounted on said chassis and operatively engageable with said tone arm for moving said tone arm vertically and horizontally, a cam mounted for movement on said chassis and operatively associated with said cam follower, a turntable mounted for vertical and rotary movement on said chassis, a pick-up member fixed to the lower side of said turntable and over said cam for driving said cam from said turntable, a movable element on said cam in the path of movement of said pick-up member, and a position determining device on said chassis and operatively associated with said movable element for positioning said movable element in the path of movement of and in operative engagement with said pick-up member, said position determining device including friction means disposed to engage the rim of said turntable when it is moved vertically to a lowermost position.

11. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for vertical and horizontal movement, a tone arm control member movably mounted on said chassis and operatively engageable with said tone arm for moving said tone arm vertically and horizontally, a change-cycle control means mounted for movement on said chassis and operatively associated with said control member, a turntable mounted for vertical and rotary movement on said chassis, a pick-up member fixed to the lower side of said turntable and over said change-cycle control means for driving said change-cycle control means from said turntable, a tripping means operatively associated with said change-cycle control means in the path of movement of said pick-up member, and a position determining device on said chassis and operatively associated with said tripping means for positioning said tripping means in the path of movement of and in operative engagement with said pickup member, said position determining device including means disposed to engage said turntable when it is moved vertically to a lowermost position.

12. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for vertical and horizontal movement, a cycle control means operatively associated with said tone arm for moving said tone arm vertically and horizontally, a turntable mounted for linear and rotary movement on said chassis and tripping means operatively associated with said cycle control means and said turntable when it is moved linearly for actuating said cycle control means.

13. A phonograph mechanism comprising a chassis, a tone arm mounted on said chassis for vertical and hori- 10 zontal movement, a turntable mounted for linearand rotary movement on said chassis, record changing mecha nism operatively associated with said turntable and said tone arm, change-cycle control means operatively associzontal movement, a turntable mounted for linear and rotary movement on said chassis, record changing mechanism operatively associated with said turntable and said tone arm, change-cycle control means operatively associated with said tone arm and said record changing means for playing one record after another, and tripping means operatively associated with said tone arm, said changecycle control means and said turntable and actuated by linear movement of said turntable for driving said changecycle control means from said turntable.

15. A phonograph mechanism comprising a turntable, a tone arm mounted for limited universal movement and including a control arm, a cam follower operatively associated with said control arm for moving said tone arm in both vertical and horizontal directions for predetermined distances, a circular cam for actuating said cam follower and mounted for rotation eccentrically of said turntable, cam-operating means interposed between said turntable and said cam for connecting said cam with said turntable for rotation therewith, and actuation means operatively interposed between said tone arm and said cam-operating means for selectively actuating said camoperating means in responseto movement of said tone arm 16. A phonograph mechanismcomprising a turntable,

a tone arm mounted for limited universal movement, a cam follower operatively associated with said tone arm for moving said tone arm in both vertical and horizontal directions for predetermined distances, a circular cam for actuating said cam follower and mounted for rotation eccentrically of said turntable, cam-operating means interposed between said turntable and said cam for connecting said cam with said turntable for rotation therewith, and actuation means operatively interposed 'be tween said tone arm and said cam-operating means for selectively actuating said cam-operating means in response to movement of said tone arm.

17. A phonograph mechanism comprising a turntable, a tone arm mounted for limited universal movement and including a control arm, a cam follower operatively associated with said control arm for moving said tone arm in both vertical and horizontal directions for predetermined distances, a cam for actuating said cam follower and mounted for rotation eccentrically of said turntable, cam-operating means comprising a dog on said turntable and a lever on said cam for connecting said cam with said turntable for rotation therewith, and actuation means operatively interposed between said tone arm and said lever for selectively actuating said cam-operating means in response to movement of said tone arm.

18. A phonograph mechanism comprising a base plate, a turntable mounted thereon, a tone arm mounted for limited universal movement, a cam follower operatively associated with said tone arm for moving said tone arm in both vertical and horizontal directions for predetermined distances, a cam for actuating said cam follower and mounted for rotation, cam-operating means interposed between said turntable and said cam for connecting said cam with said turntable for rotation therewith, actuation means operatively interposed between said tone arm and said cam-operating means for selectively actuating said cam-operating means in response to movement of said tone arm and means on said base plate for stopping said cam for an interval during a record changing cycle.

19. A phonograph mechanism comprising a base plate, a turntable mounted thereon, a tone arm mounted for limited universal movement and including a control arm, a cam follower operatively associated with said control arm for moving said tone arm in both vertical and horizontal directions for predetermined distances, a circular cam for actuating said cam follower and mounted for rotation eccentrically of said turntable, cam-operating means interposed between said turntable and said cam for connecting said cam with said turntable for rotation therewith, and actuation means operatively interposed between said tone arm and said cam-operating means for selectively actuating said cam-operating means in re- 12 sponse to movement of said tone arm and means on said base plate for actuating said cam-operating means midway of a record changing cycle to stop said cam for a certain interval and then to complete the record changing cycle.

References Cited in the file of this patent UNITED STATES PATENTS 2,517,165 Ascoli Aug. 1, 1950 2,544,230 Johnson Mar. 6, 1951 2,558,474 Albrecht June 26, 1951 2,616,705 Leonard Nov. 4, 1952 2,634,135 Carson Apr. 7, 1953 2,743,109 Mullaney Apr. 24, 1956