US2537214A - Sound recording apparatus - Google Patents

Description

Jan. 9, 1951 Filed April 5, 1948 u. L. Di GHILINI I SOUND RECORDING APPARATUS 3 Sheets-Sheet l Jan. 9, 1951 U. L. D] GHILINI SOUND RECORDING APPARATUS 3 sheets sheet 2 Filed April 5, 1948 ATTDRHEIS Jan. 9, 1951 Filed April 5, 1948 U. L. DI GHILINI SOUND RECORDING APPARATUS 3 Sheets-Sheet 3 Patented Jan. 9, l951 SOUND RECORDING APPARATUS Ulrich L. di Ghilini, deceased, late of Beverly Hills, Califi, by Alexander E. di Ghilini and Leo E. di Ghilini, administrators, Beverly Hills, Calif., assignors, by decree of court, of one-third to Alexander E. di Ghilini, one-third to L. Elston di Ghilini, and one-third to Leo W. Petroff Application April 5, 1948,'Serial No. 19,106

This invention relates to an apparatus for recording and reproducing sound on and from a disk record, and refers particularly to an apparatus of the type in which a'constant groove speed is maintained relative to the stylus. I

One object of the present invention is to pro vide an apparatus of the above-described class, in which an improved arrangement is included for driving the turntable by means of a friction wheel, the apparatus being characterized ,bythe fact that the carriage is provided with a fork portion through which the drive shaft extends, and by which the carriage is partially supported. The apparatus is further characterized by the fact that a roller ispositioned in this fork keyed to the drive shaft carried axially by the movement of the carriage, the friction wheel being adapted to be squeezed between this roller and the turntable in driving position. By this constructure of the carriage and arrangement for driving the turntable through the friction wheel, it is found that a, markedly superior recording operation is effected.

Another object of the present invention is to provide an improved stylus arm mounting and control apparatus. The stylus arm and control ap aratus of the present invention is characterized by the fact that it is movable into three positions: one, a release position for shifting the carriage where the arm is elevated from the turntable; two, a play-back position where the stylus arm is substantially locked to the carriage so as to be bodily radially moved with the movements of the carriage. the stylus arm, however, being permitted a slight freedom of rotation about a vertical axis equivalent to moving the stylus to small numbered, two or three. groove widths; and a third position intended for recording, in which the entire weight of the arm is disposed upon the stylus and all freedom-of movement of the arm about a vertical axis is prevented. so th t the arm is positively locked for bodily movement with the movement of the carriage: and in which the weight im osed in this recording operating position is adjustable. The ap aratus is further characterized by the fact t at throu h the'movement of a s ngle control lever the stylus arm m ybe mov d to these respective positions while at the same time the drivint meansfor the turntable and carriage are controlled.

15 Claims. (01. 2'74 12) drawings, in which:

ure 8.

Figure 1 is a fragmentary plan View with the turntable broken away.

Figure 2 is a side view with the turntable i place.

Figure 3 is an enlarged section mainly on the line'3'3 of Figure 1, but with the casing of th head partially in section. .7 Figure 4 is a fragmentary section substantially on the line 4--4 of Figure l. Figure 5 is a fragmentary side view of Figure 4. Figure 6 is a fragmentary section on the line BB of Figure 3. l

Figure '7 is a fragmentary section on theline 1-1 of Figure 3.

Figure 8 is a fragmentary side view of the stylus arm. V

Figure 9 is a section on the line 9-9 of Fig- Figure 10 is a side view of a lock employed in Figure 9.

porting a disk 3 of suitable material, such as plastic, upon which recordings are to be made. The turntable 2 is attached to an axle 4 and is 1 rotatably mounted by the frame 5. The axle 4 has a worm 6, which engages a worm wheel attached to a horizontal shaft 5. The shaft 1 has its major portion threaded as indicated at 8, and

as later described. serves as an advancing scre forthe carriage of the apparatus. a

, .The carriage comprises a main body member f8, which is supported by a drive shaft l0 and a rod II. The rod H is mounted by bearings l2 in the frame 5, so as to be axially slidable through said bearings, and is rigid with the body '90f the carriage so, as to move therewith, being *lield thereto by the set screw l3. The drive shaft Ill; is mounted by bearings l4 supported by the frame 5 and is provided with a pulley I5 by means of which it may be driven. The portion of the drive shaft l9 between the sides of the frame 5 is provided with a slot l6 intended to act as a key way. As illustrated more clearly in Figure '7,

the body member 9 of the carriage is bifurcated,

mounting spaced apart bearings l1 and I8 receiving the drive shaft I0.

To the body member 9 of the carriage there is mounted a roller member, which comprises a sleeve i9, which may be of metal, the ends of which have a bearing contact with the sides of the bifurcation of the member 9. On the exterior of this sleeve I9 is mounted a cylinder 25, which may be of slightly reduced width, which provides a smooth cylindrical outer surface. This cylinder 29 is preferably formed of material such as fiber, plastic or rawhide, which will offer a resistance to slippage to the friction wheel hereafter described. In order to provide for keying this roller member to the slot l6 of the drive shaft l0, and to also provide for its assembly in its intended operating position between the bifurcations or forks of the body member 9, there is provided a U-shaped key 2|. This U-shaped key is of metal of a width corresponding to that 1 of the slot [5, and is mounted in a radial slot through the sleeve |9. The central portion 22 of the U-shaped key 2| is of a width to allow radial movement of the key from the position shown in Figure 7 to an outer position, where it will clear the shaft l and thus allow for assembly of the apparatus. By this construction the roller member is carried axially of the drive shaft H] by movements of the carriage, but rotates smoothly with the rotation of the drive shaft |9.

One of the bifurcations of the body member 9 of the carriage is again bifurcated, as indicated at 23, to mount a pin 24, to which is pivoted an arm 25, which, as illustrated in Figure 3, carries a threaded shoe 26 for engagement with the underside of the threaded portion 8 of the feed serew I, so as to cause an axial movement of the carriage 9 with the rotations of the feed screw. The arm 25 is yieldingly urged into position to contact the feed screw by the spring 21, and is provided with a face 28 which, as hereafter explained, is used for moving the arm to a retracted positi n- The body 9 of the carriage is provided with a vertical slot 28 which receives a friction wheel zontal direction, so that the friction wheel and arm 29 are movable from the position shown in Figures 3 and i to the. right. In the position shown in Figures 3 and 4 the friction wheel has dropped from contact with the underside of the turntable 2 and from contact with the cylinder 3 20. There is provided a stop 35 on the body, which in the position shown in Figures 3 and 4 limits the lowering of the friction wheel. On movement to the right the friction wheel 3| is brought into engagement with the cylindrical roller and raised slightly so as to bring it in contact with the underside of the turntable 2. The friction wheel is yieldingly urged to this operating position by springs located on opposite sides of the body 9 of the, carriage; Th

CJI

slot 3e-of the'body 9 ofthe carriage. has acam portion "for cooperation with the movement of the friction wheel and arm 29 to the release position shown in Figures 3 and 4 is under control of a rod 31, which is actuated by control mechanism hereafter described.

The body 9 of the carriage has an upwardly extending portion or mounting post 38, the lower portion of which is vertically slotted as indicated at 39. On the upper end of this mounting post is positioned a plate 40, and a pin 4| pivotally supports one end of the plate 40 on the mounting post 39, the pin being mounted at bearing 42. A second pin 43 is axially movable through a vertical opening in the mounting post 38 and has a tapered upward end 44 of slightly reduced diameter. This pin43 is yieldingly urged downwardly by a spring 45 held to the plate by the set screw 55. In the position illustrated in Figure 4 the plate it is capable of undergoing a rotation about the pivot pin 4| of a few thousandths of an inch, because the tapered portion 45 of the pin G3 only is in engagement with the plate is. As later described, the pin 43 may be moved upwardly to positively lock the plate 40 against any movement relative to the post 38. There is also provided a spring lock 45 for holding the plate 45 down against the surface of the mounting post 38.

The plate 4i} has a pair of downwardly turned A stylus arm 48, as illustrated in Figure 6, is pivotally mounted on these ears by means of set screws 49. This stylus arm is preferably weighted, as indicated at 50, by means of a lead weight, and to the stylus arm is pivoted a head 5i carrying a stylus 52. The head 5| may be any usual electrical pick-up for generating electric currents from vibration of the stylus 52 or for vibrating the stylus 52 in response to currents passed to the head 5 I. Above the head 5| is provided a coil spring 5? which acts as a cushion in moving the apparatus but does not materially load the head in operation. The head 5| is provided with a set screw 53, which operates to lock stylus 52 in position as well as a stop to limit the heads downward movement. The head 5| is pivoted, as indicated at 56, to the arm 48 by a locking device illustrated in Figures 9 and 10. Said locking device comprises a rod 55 adapted to be turned by the knob 55, which rod carries a pin 51 working in a J-slot of a sleeve 59, said rod having a flange 69 at its end. In installing the head 5| the sleeve 59 is inserted in the head 5| which is then moved in position with the slot in a plane parallel to the long axis of head 5| and facing towards stylus 52, whereupon the rod 55 is passed axially through the sleeve. It is then turned clockwise 25 so as to cause pin 5'! to move in the J-slot so as to lock-the parts from axial but not vertical movement, the rod 55 then being lockedin a set position by the set screw 58. The J-slot should have about a arc.

The mechanism of the present invention is movable to three operating positions. In one operating position the apparatus is intended for recording. In the second operating position the apparatus is intended for playing back records previously recorded. In the third operating position (which is illustrated in the drawings) the apparatus is retracted to allow for shifting of the carriage. Tov condition the various elements so that they may be simultaneously moved to these three different operating positions, a cam member 18 is pivoted on-a pin-1| extending through the This cam rod'fifi for elevating the rod 4 3;as thecam turns counterclockwise, as viewed in Figure 4,. after. a short period of rotation of the cam 10. The cam has a sideface13, which is in sliding contact with a collar 14 on the rod 31. It is the contact between this face and the collar 14 which moves the friction wheel arm 29 to the release position as shown in Figure 4. As thecam member 10 is rotated counterclockwise it allows the springs 36 to pull the friction wheel arm 29'into the operating,

position. The cam member 18 is also provided with a surface 15, which is a segment of a cylinder with the center at the center of rotation of the cam 10. This surface 15, in the position shown in Figure 4 of the drawings, is in contact with a roller 16 carried by an arm 11. The arm 11 is pivoted, as indicated at 18, to the carriage and is attached to a spring 19, which is in turn attached through an adjustment device 80 to the stylus arm 48. When the cam 18 has been 'rotated a sufficient distance to disengage the roller 16, the arm I1 may pivot upwardly to partially release the tension of spring I8 in holding the stylus arm 48.

The axle H which is rigid with the cam 18 through the use of a set screw 8|, is provided at one side of the post 38 with an enlargement carrying the operating handle 82. The enlargement also is provided with a segmental cylindrical sur face 83, which in the position illustrated, for example; in Figure 3 of the drawings, is in contact with an extension 84 ofthestylus arm 48, so as to elevate said arm. On counterclockwise rotation of the cam III, the cam face 83 releases the extension 84 to permit the arm-48 to drop downwardly as indicated, for example, in Figure 8. In order to latch the mechanism in the three intended operating positions, the shaft II is provided on the opposite side of the post 38 from the operating handle, with a latching device comprising the crank member 85, which carries a spring compressed ball 88 in position to successfully engage three depressions 8! in a small plate 88 held to the post 38 by set screws 88.

In operation of the apparatus of the present invention. the control handle 82 may be moved first to the releasing position in which the parts are shown in most of the figures of the drawings. In this position the stylus arm is held upwardly by contact between the face 83 and the extension 84 of the stylus arm. The face of cam 10 presses on roller 16 to increase tension on spring 19 to aid in raising arm 48. Likewise, the friction wheel arm 29 is shoved to the left,-as viewed in Figure 4, by contact of the cam in with the collar '!4 so as to release the friction wheel both from the roller 20 and from the underside of the turntable 2. This motion, through the contact between the pin 34 and face 28 of the arm pivots that arm counterclockwise to release the shoe 26 from the advancing screw. The apparatus is thus disengaged and the carriage may be slid radially with respect to the record to any desired position.

Whenthe control handle 82 is rotated to the second operating position, the contact between extensions 83 and 84 is altered through the curvature of 84 so as to allow the arm 48 to a sume a horizontal position. In this position only the weight of the head 5| will be imposed on the stylus. controlled by the manufacture of the head. The rotation of the cam-18 to this second operating position has likewise allowed the friction wheel arm 29 to be drawn back into this operating position, so that the friction wheel 3| is in simultaneous The desired weight for play-back is thus.

time of a record of given size.

of the turntable 2. Simultaneously, the arm 25 has been released so that its spring 21 may bring the drive shoe 26 into contact withthe advancing In this position the apparatus is in condition for reproducing records previously recorded. I

When pulley I5 is rotated at constant'speed, the roller 20 is rotated at constant speed, which in turn drives the friction roller 3| at constant speed. This friction wheel 3] is mounted-so as to engage the turntable 2 at a point insubstantially radial alignment with the stylus 52. In operation, therefore, linear groove speed recording and play-back is effected independent of the radial position of the stylus 52 with respect to the center of the turntable 2.

In play-back operations the stylus arm 48 is carried radially of the turntable bodily with the movement of the carriage 9. The position of the stylus arm and the stylus 52 relative to the carriage is very nearly rigid except about av horizontal axis, so that the work of moving the stylus .arm is not imposed upon the record. However, a

slight freedom of movement about a vertical axis is desirable in play-back operations and, accordingly, in this position the tapered end 44 of the pin 43 will allow a movement of the stylus corresponding to two or three groove widths of recording.

By further counterclockwise rotation of cam Ill,

through movement of the arm 82, the apparatus is conditioned for recording. 'The contact between 83 and 84 is now discontinued so as to allow the arm 48 to drop and impose its weight on head 5|. The head becomes rigid with arm 48. The weight imposed on the stylus is now regulated .by the adjustment device 88, since part of the ously, the face '15 of cam 18 releases roller 16 to bring spring '19 into a desired operative position. Thereby, the entire weight of the arm 48 is available to be imposed upon the stylus 52, spring 52 being substantially compressed and spring 59 now counterbalancing arm 48.

By the apparatus herein described, it is possible to record and reproduce messages on records in which many times the usual lines per inch are recorded and reproduced from the same record, greatly increasing the recording and play-back These improvements in operation are dependent to considerable extent on the novel manner by which the friction wheel 3! is able to drive the turntable 2 by direct contact between it and the roller 20, which is rigid with the driv shaft as far as rotary movement is concerned, but which moves axially with the carriage so as to always present the same surface to the friction wheel 3!. In eifecting recordings of this type in recording and playback operations, where recording of a great number of lines per radial inch of record are carried out, it is necessary that the operation of the arm which carries the stylus be positively controlled.- The movement of the arm as the recordings prqceed radially with respect to the record must be fcordi'ngly; in play-back operations this arm is ibodily carried with the carriage, yet'in these play- '.-j-,back operations a very slight freedom of move- Iment in .the nature of two or three groove widths -must be provided for at the stylus point, while in recording operations an absolute freezing of the stylus to the carriage with respect to motion {about a vertical axis is necessary. The apparatus :of the present invention provides this type of L control over the stylus arm by an accurate conrtrol of the relative weights to be imposed on the 4 stylus during recording and play-back operations, and further accomplishes these adjustments through the operation of a single control mem- 71381. f .While the particular examples of the apparatus of the present invention herein specifically de- "scribed have in practice been found well adapted for carrying out the objects of the invention, it is "to be understood that various modifications and changes may be made, and this invention is of the scope set forth in the appended claims.

It is claimed:

1. An apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially of the turntable by a carriage which in turn is advanced by an advancing screw driven by the turntable, the carriage carrying a stylus arm, such apparatus being characterized by a drive shaft upon'which the carriage is partially supported and mounted for movement axially of the drive shaft, the drive shaft having a key way and the carriage being slotted where the drive shaft extends through the carriage, a roller keyed 'to the drive shaft and positioned in said slot and in contact with the side walls thereof so as to move axially of the drive shaft with the carriage, and means for mounting the friction wheel on the carriage so that it is movable to and from theposition wher it is yieldingly pressed simultaneously against said roller and said turntable.

Y 2. An apparatus for ecording and reproducing sound on a disk record of the type in which a turntable is rotated by a frietior radially of the turntable a carriage which in turn 'is advanced by an advancing screw driven by the turntable, the carriage carrying a stylus arm, such apparatus being characterized by a drive shaft extending through said carriage and upon which said carriage is partially mounted for movement axially of the drive shaft, said carriage having a slot in the portion thereof through which the drive shaft extends, the drive shaft having a key way, a roller ed to the drive shaftand disposed in said slot in engagementat its ends with the walls thereof so as to move axially with the movement of said carriage, an arm carrying said friction wheel in position to maintain the same in the same axial alignment with "said roller, said arm being movable to and from the position where said friction wheel is in simultaneous contact with said turntable said roller.

'3. An apparatus for recording and reproduc ing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially of the turntable by a carriage which in turn is advanced by an advancing screw driven by the turntable, the carriage carrying a stylus arm, such apparatus being characterized by a drive shaft'extending' through said carriage and upon which said carriage is partially mounted for movement axially of the drive shaft, said carriage "having-aslot in'the portion thereof through which wheel moved .:the drive shaft extends, the drive shaft having a key way, a rollerkeyed to the drive shaft and disposed in said slot in engagement-at its ends with the walls thereof so as to move axially with the movement of said carriage, an arm carrying said friction-wheel in position to maintain the same in the same axial alignment with said roller, said arm being movable to and from the position where said friction wheel is in simultaneous contact with said turntable and said roller, and means for yieldingly urging said arm and friction wheel into said position.

4. An apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially of the turntable by carriage which in turn-is advanced by an advancing screw driven by the turntable, the carriage carrying a stylus arm, such apparatus being characterized by a drive shaft which extends through a portion of said carriage, upon which said carriage -is partially supported for movement axially of-said drive shaft, said portion of said carriage having a slot, and said drive shaft having a key way, a roller member disposed in said slot'and keyed to said drive shaft, said roller including a sleeve in bearing contact with the side walls of said carriage and a cylinder member on said'sleeve of friction material, and means for supporting said friction wheel on said carriage for movement to and from a position in which said friction wheel is in simultaneous contact with said cylinder member and said turntable.

5. An apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially of the turntable by carriage which in turn is advanced by an advancing screw driven by the turntable, the carriage carrying a stylus arm, such apparatus being characterized by a drive shaft which extends through a portion of said carriage, upon which said carriage is partially supported for movement axially of said drive shaft,"said portion of said carriage having a slot, and said drive shaft having ak'ey way, a roller member disposed in said slot and keyed to said drive shaft, said roller including a sleeve in bearing contact with the side walls of said carriage and a cylindrical member on said sleeve of friction material, and means for upporting Said friction wheel on said carriage for movement to and from a'position in which said friction wheel is in simultaneous contact with said cylinder member and said turnable, said roller member including a U-shaped lzey, the sleeve of said-roller member having a radial slot in which said key is radially mounted.

6. In an' apparatus for recording and reproducing sound on a disk record of 'the type in which a turntable is rotated by a friction wheel moved radially of the "turntable by a carriage which in turn is advanced by an advancing screw driven by the turntable, a carriage carrying a stylus arm characterized by means for mounting the stylus arm on said carriage, which means includes a member to which said stylus arm is pivoted for rotation about a horizontal. axis, said member being mounted on said carria e for a limited movement of a few groove widths of said stylus about a vertical axis, means for restricting said mo'vement'of said member relative to said carriage, said means including'a 'tap'er e'd'pin carried by said carriage and movable within said carriage andinto'a hole in saidm'em'ber and having a'portion fitting said Ih'ol'e without clearance for .9 thus locking said member and said carriage together,. and means mounted on said carriage including a movable element engaged wi,h said pin for moving said pin into lockingengagement with said member.

7. In an apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially oi the turntable by a carriage which in turn advanced by an advancing screw driven by the turntable, a carriage carrying a stylus arm characterized by means for mounting the stylus arm on said'carriage, which means includes a member to which said stylus arm is pivoted for rotation about a horizontal axis, said member being mounted on said carriage for a limited movement of a few groove widths of said stylus about a vertical axis, and means for restricting said movement of said member relative to said carriage, said means including a tapered pin-carried by said carriage and movable within said carriage and into a hole in said member,

and having a portion fitting said hole without clearance for thus locking said member and carriage together, a movable element mounted on said carriage and engaged with said pin for moving said pin into locking engagement with said member, an adjustable spring device for controllably counterbalancing the stylus arm, and operating means for simultaneously releasing said spring device with prearranged recording tension and actuating said movable element for locking said member to said carriage.

8. In an apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially of the turntable by a carriage which in turn is advanced by an advancing screw driven by the turntable, a carriage carrying a stylus arm characterized by a member mounted on said carriage to 'which'said stylus arm is pivoted for movement about a horizontal axis, said member having an opening receiving a tapered pin mounted for vertical movement by said carriage, said tapered pin having a portion allowing a limited movement of the stylus arm about a vertical axis and having a portion fitting the opening i said member for locking the stylus arm against movement about a vertical axis with respect to said carriage, a spring tension counterblancing means for said stylus arm, and a control member rigid with cam means including a cam port-ion for vertically moving said tapered pin and releasing said spring device.

9. In an apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated b a friction wheel moved radially of the turntable by a carriage which in turn is advanced by an advancing screw driven by the turntable, a carriage carrying a stylus arm characterized by a member mounted on said carriage for a limited movement about a vertical axis, said member having an opening,

a tapered pin mounted upon said carriage for vertical movement into said opening and having a retracted position in which it allows such limited movement of said member and an advanced position in which it prevents the same, and

' means on said carriage including a movable element engaged with said pin for advancing said pin vertically from its retracted position into locking engagement with said member, said stylus arm being pivoted to said member about a horizontal axis, said stylus arm pivotally supporting about a horizontal axis a recording head.

' 10. In an apparatus for recording and repro-.

ducing'sound on a disk record of the type in,

which a turntable is rotated by a friction. wheel moved radially of the turntable b a carriage which in turn is advanced by an advancing screw driven by the turntable, a carriage carrying a stylus arm characterized by a member mounted on saidcarriage for a limited movement about a vertical axis, said member having an opening, a tapered pin mounted upon said carriage for vertical movement into said opening and having a retracted position in which it allows such limited movement of said member and an advanced position in which it prevents the same, means on said carriage including a movable element engaged with said pin for advancing said pin vertically from its retracted position into locking engagement with said member, said stylus arm being pivoted to said member about a horizontal axis, said stylus arm pivotally supporting about a horizontal axis a recording head, and a releasable spring device for counterbalancing said stylus arm.

11. Apparatus as defined in claim 7, including an extension carried by the stylus arm and a cam engageable with said extension for rotating said stylus arm about its horizontal axis to raise and lower the stylus arm relative to the turntable, and in which the operating means also rotates said cam to eiiectlowering of said stylus arm simultaneously with the releasingof the spring device and the movement of the tapered pin into locking position.

12. In an apparatus for recording and reproducing sound on a disk record of the type in which a turntable is rotated by a friction wheel moved radially of the turntable by a carriage which in turn is advanced by an advancing screw driven by the turntable, a carriage carrying a stylus arm characterized by means for mounting the stylus arm on said carriage, which means includes a member to which said stylus arm is pivoted for rotation about a horizontal axis, said member being mounted on said carriage for a limited movement of a few groove widths of said stylus about a vertical axis, means for restricting said movement of said member relative to said carriage, said means including a locking element carried by said carriage and movable relative to said carriage and into interlocking engagement with said member for locking said member and said carriage together against relative movement, and operating means mounted on said carriage including a movable element engaged with said locking element and actuatable for moving said locking element into locking engagement with said member.

13. Apparatus as defined in claim 12, in which the member to be locked to the carriage carries spring means yieldably opposing movement of the locking element into locking position and normally maintaining the locking element engaged with the movable element.

14. Apparatus as defined in claim 12, including an extension carried by the stylus arm and a cam engageable with said extension for rotating said stylus arm about its horizontal axis to raise and lower the stylus arm relative to the turntable, and in which the operating means for actuating the movable element for moving the locking element into position is arranged to also actuate said cam to effect lowering of said stylus arm relative to saidturntable.

15. Apparatus for recording and reproducing sound on a disk record, comprising: a turntable;

answers;

II? a carrla'ge;r means supporting said carriage. for movement relative to said turntable; a drive roller carried by said carriage; a friction wheel also carried by said carriage and engageable with said drive. roller and turntable for transmitting adrivefrom said roller to said turntable; a first means for effecting engagement of said friction wheel with said. roller and turntable; a carriage advancing screw driven by said turntable; a

otally mounted upon said carriage for movement 15 toward and away from said turntable; a third meansactuatable to control the position of said stylus arm. relative to saidturntable; and a control handle arrangedto actuate said first means to engage said friction wheel with said roller to drive said turntable, to actuate said second means to engage said shoe with said: screw to effect movement of said carriage relative to said turn table, and to actuate said third means to lower said stylus arm toward said turntable, all upon movement of said handle to a given position.

ALEXANDER E. m GHILINI, LEO E. n: GHILINI, Administrators of the Estate of Ulrich L. d/i

Ghzlmi', Deceased.

REFERENCES CITED The following references are of record in the his of this patent:

UNITED STATES PATENTS Number Name Date 532,851 Wassenich Jan. 22, 1895 1,100,755 MacDonald June 23, 1914 2,180,094 Renholdt Nov. 14, 1939 2,267,693 Di Toro Dec. 23, 1941 2,293,217 Rieber Aug. 18, 1942 2,332,784 De Sart Oct. 26, 1943' 2,434,033 Cain Jan. 6, 1948 2,455,466 Brubaker Dec. '7, 1948

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