US2031449A - Automatic gramophone - Google Patents

Description

Fb. 18, 1936. i s. P. ARVIDIUS 2,

. AUTOMATIC GRAMOPHONE Filed Nov 1, 1934 4 Sheets-Sheet l Feb. 18, 1936. s. P. ARVIDIUS AUTOMATIC GRAMOPHONE Filed Nov. 1, 1934' 4 Sheets-Sheet 2 Feb. 18, 1936. s. P. ARVIDI'US 2, 1, I

AUT OMAT I C GRAMOPHONE Filed Nov. 1, l934 4 Sheets-Sheet 3 s. P. ARVIDILJS 2,031,449

AUTOMATIC GRAM0PH0NE Pea-18,1936.

Filed Nov. 1, 1934 4 Sheets-Sheet 4 l ateniecl Feb. 18, 1936 Svante Philip Arvidius, Malmo, Sweden Application November 1,1934, Serial No. 751,064

REISSUED In Sweden August 28, 1934 Claims. (Cl. 274-) This invention relates to automatic gramophones of the kind in which a pile of records is supported centrally above a turntable, the records being dropped one at a time upon the turn- I 5 table and played in succession.

The invention has for its object to provide an improved mechanism for effecting the necessary motions of the movable arm carrying the reproducing needle, and for actuating the means carrying the pile of records so as to cause a fresh record to be dropped upon the turntable after playing of eachpreceding record.-

Further objects of the invention are to provide a mechanism of this character which is reliable in its-operation and comparatively simple and inexpensive in its construction and which I can be readily applied as an attachment, if desired, to existing gramophones of any conventional type. v

With this and other objects in view, the invention consists in certain novel features of construction, combination and arrangementof parts as will fully appear as the descriptionproceeds,

the novel features thereof being pointed out in the appended claims.

For a full understanding of the invention, reference is to be had to the accompanying drawingswhich illustrate a preferred embodiment of the invention and in which: I

' Fig. 1 is a plan view of the attachment.

Fig. 2 is a side view of the same, partly in section. r

Fig. 3 is a side view of the mechanism with parts thereof shown in section.

. Fig. 4 is a section substantially on the line IVIV in Fig. 1. p

Figs. 5, 6, 'I and 8 are plan views; partly in section, of the mechanism with parts thereof in differentposition as will be fully understood from 9 the-following description. In the drawings, I represents a base plate placed or adapted to be placed underneath the turntable 2 on the gramophone. The ends of the plate I extend beyond the turntable 2, andnear the edge'of the turntable at diametrically op-.

posed points thereof there are mounted on the plate I two rotatable uprights 3 preferably in the form of tubes journaled at their low r ends on pivots l'sec'uredto the plate I The ivots l 5 have screw threaded boresi'or screws 5 by which the plate I is secured to the gramophone, and

' for upwardlyproj'ecting screw spindles 8- which are provided with collars 1 or the like for holding the tubes 3 ontheir pivots l. The tubes 3 at their upper ends are provided with knobs! Jourupon the turntable, in'position to be playedby naled on the upper ends of the spindles 6. Arms 9 secured to the lower ends of the tubular 11P- rights 3 are linked at ill to a push rod H so that the two uprights 3 are rotated to the same extent when the rod H is moved in its longitudinal 5 direction. The rod I I is biased in its normal position, shown in Figs. 1 and 2, by means of a spring l2. Near their upper ends the rotatable uprights 3 are provided with lateral projections i3 and H on different levels, the distance between which eorresponds to the thickness of a record. The turntable 2 is provided with a central spindle l5 projecting to substantially the same level as the uprights 3.

- The records l6" to be played in succession are piled on the spindle l5 and rest on the lower projections l3 on the uprights 3, as is shown in Figs. 1 and 2, until they are dropped upon the turntable in their proper turns. The first record to be played, however, preferably is placed by hand directly on the turntable. By pushing the rod Ii against the action of the spring 12 the uprights 3 are rotated in a direction. for displacing the projections l3 and H in such a manner ,that the lowermost record in the pile is released and dropped upon the turntable 2. When the lowermost record in the pile is released, the remaining recor in the pile are supported by the upper projections l4, and when the rod H and the uprights 3 arereturned in their normal positions under the action of the spring l2, the pile of records again is supported by the lower projections l3. Thus, after playing of each preceding record, afresh record can be dropped pushing the rod ll against the action of the springs 12. The rod II is adapted tobepushed for this purpose by an automatically-acting mechanism by which also the needle carrying arm, after playing of each preceding record, is automatically raised and swung outwardly, clear of the played record, to allow for a fresh record being dropped upon the turntable, and then swung inwardly and lowered, until the reproducing needle has engaged the beginning of the 5 sound groove on the fresh record.

In the embodiment of the invention illustrated on the drawings, the invention is applied to an electric gramophqne having the reproducing needle I! secured'to a pick-up l8; but it will be 5 understood that the invention, if desired, with but relatively small changes also can be applied to a gramophone having a sound-box carried by a tone-arm.

' The'pick-up l8 iscarried on a vertically and 66 horizontally swinging arm i9 pivoted by means of a pin 23- at the free end of a bent arm 2| (Figs. 3 and 4) secured to the upper end of a vertical sleeve 22 rotatably mounted in a socket 23 secured in a framing 24 on the base plate I at one of the ends thereof projecting beyond the turntable 2. A slidable pin 25 fitted in the sleeve 22 rests at its lower end on a cam flange 25 on a cam disk 21 having a-vertical shaft 23 journaled in the framing 24. Secured on the lower end of the sleeve 22 is a lever, 29 provided at one end with two suitably shaped shanks 33 and 3| extending over the cam disk 21 on opposite sides of the shaft 23 and adapted to be actuated by a roller 32 or the like mounted on the cam disk 21. At the other end the arm 29 is provided with a segment 33 frictionally engaged between the shanks of a bow or clamp 34 rotatably mounted on a vertical shaft35 journaled in the framing 24. Secured on the shaft 35 is an arm 35 carrying at its free end a friction roller 31 adapted to be brought into engagement with the edge of the turntable 2 so as to be driven thereby. Mounted on the shaft 35' is a plate 35 has a portion extending upwardly adjacent the bow or clamp 34 so as to limit rotation of the latter in relation to the plate 33 and the arm 33 about the shaft 35 to but a small value. I The plate 33 alsohas a projecting arm 4| the free end of which abuts the cylindrical circumference of the cam disk 21 or enters a recess 42 therein. An arm 43 is detachably and adjustably secured to the upper end of the shaft 35 by means of a split sleeve 44 and is provided at its free end with a roller 45 or the like in the path of the-needle carrying arm 5.

The friction roller 31 is fixed to its shaft 45 which is journaled in the free end of the arm 35.

. Secured to the lower end of the shaft 45 is a pinion 41, and the cam disk 21 is operatively connected to this pinion 41 through a. gearing comprising a wheel 43 secured to the cam disk 21 and engaged with a pinion 43 secured to a wheel' 53 engaged with a pinion 5| journaled on the shaft 35 and secured to a wheel 52 engaged with the pinion 41.

The operation of the mechanism now described is. as follows. Figs. 3 and 7 show the mechanism with the parts thereof in positions occupied during playing of a record. The free end of the arm 4| in this position has entered the recess 42 in the cylindrical circumference of the cam disk 21, and the friction roller 31 is out of engagement with the edge of the rotating turntable 2. Supposing that the needle carrying arm l5, when the end of the record is reached, is rapidly moved towards the centre of the record by means such as a large-pitch groove ending in a concentric groove on the record, the arm I! during this-rapid motion engages the roller 45 or the like on the arm 43 and moves the latter, whereby the shaft 35 and the arm 35 are rotated to bring the friction roller 31 in frictional engagement with the edge of the rotating turntable 2. The friction roller 31 is now'driven by the rotating turntable 2, whereby the cam disk 21 is rotated through the gearing 41, 52, 5|, 53, 45, 43. Thus, the recess 42 in the cam disk 21 is movedaway from the free end of the arm'4|, which thereby will have to rest against the cylindrical circumference of the cam disk 21, whereby the arm 35 will be held with the roller 31 in engagement with the rotating turntable 2, until the cam disk 21 has been rotated through one revolution so that the end of the arm 4| again enters the recess 42. During this rotation of the cam disk 21 through one revolution the pin 25 is first raised by an ascending portion of the cam flange 25 on the disk 21, whereby the pin 25 raises the arm IS with the reproducing needle H from the record. Then, while the pin 25 and the arm I3 are in raised position, the roller 32 or the like on the disk 21 strikes the shank 3| of the lever 29 and rotates this lever 29, the sleeve 22, and the arm 2|, whereby the arm I9 is swung outwardly. Fig. 8,

corresponding substantially to the position of the arm I9 shown at VIII'in Fig. 1, shows the relative positions of the parts of the mechanism in the moment the arm I3 is about to be swung outwardly in this manner. When the arm I! has been swung outwardly, for instance to the position shown at V in Fig. 1, an abutment 53 on the under side-of the disk 21 strikes the adjacent end of the push rod H, whereby the rod is pushed, as shown in Fig. 5, and a fresh record is released from the pile of records and dropped upon the turntable, as has already been described. During the continued rotation of the disk 21 the abutment 53 leaves the rod II which is then returned to normal position through the action of the spring l2, and the roller 32 or the like on the disk 21 strikes the other shank 30 of the lever-29 and rotates the latter and thereby the arm 2| in the opposite direction, whereby the arm I! is swung inwardly over the fresh record on the turntable to the position shown at V1 in Fig. 1 and in Fig. 6. At the same time lowering of the pin 25 and thereby of the needle carrying arm |9 is allowed for by a descending portion of the cam flange 25 of the disk 21, whereby the reproducing needle I1 is engaged with the beginning of the sound groove on the fresh record. Shortr 1y afterwards the rotation of the cam disk 21 through the one revolution is completed so that w tional engagement with the edge of the turntable 2' but is ceased to be driven, until the fresh record has been played and the same operation as that now described is repeated. It is to be noted that no spring action is relied upon for releasing the friction roller 31 from the frictional engagement with the turntable, the arrangement shown being such that the frictional driving force between the roller and the turntable tends to move the roller out of its frictional engagement with the turntable.

In the case the sound groove on the record does not end in a concentric groove as supposed above, but in an exeentric groove, the arm I 9 and thereby also the lever 29 will be put into an oscillatory motion, when the needle H has entered this excentrlc groove on the record. Through the action of this oscillatory motion and the friction between the segment 33 and the bow or clamp 34 the arm 35 is swung with the roller 31 in frictional engagement with the turntable 2, again and again as the case may be, until the cam disk 21 has been rotated sufliciently for bringing the recess 42 to leave the end of the arm. 4| so I that the latter through coaction with the cylindrical circumference of the disk 21 then holds the arm 35 with the roller 31 in engagement with I rotatably mounted above said cam member excenis such that they can slide in relation to each other at the outwardly and inwardly swinging motion of the needle carrying arm l9.

From the foregoing description it will be understood that the mechanism works both for records having alarge-pitch groove leading from the sound groove to a concentric groove relatively near the centre of the record, and for records in which the sound groove ends in an excentric groove.

The arm 43, being detachably and adjustably secured on the top of the shaft 35 by means of the. split sleeve 44, can easily be adjusted so as to suit records having a concentric end groove of a different diameter.

The mechanism, or the essential parts thereof, may be housed within a suitable housing 54.

Though I have illustrated and described a preferred embodiment of my invention in detail for the purpose of ascertaining the nature of the invention as well as for the purpose of enabling other persons skilled in the art to use and vend the same, I am fully aware that many of the details can be varied within wide limits, and also that other modifications are possible, and I reserve the right to make all such obvious modifications which properly fall within the scope of the appended claims.

What I claim and desire to Patent is: o

1. In a gramophone, a rotatable turntable, a movable arm adapted to carry a pick-up having a reproducing needle, means for supporting a pile of records centrally above the turntable and op-- erable for dropping said records one at a time upon the turntable, a cam member rotatable about a vertical axis and mounted outside the turntable on the gramophone, a vertical sleeve secure by Letters trically thereto, a slidable pin fitted in said sleeve and resting at its lower end. on said cam memher, a bent arm secured to the upper end of said rotatable sleeve, the needle carrying arm being pivoted to the free end of said bent arm and extending above the said slidable pin, whereby to raise and lower the needle carrying arm through raising and lowering said pin by the saidcam member at each revolution thereof, a lever secured to said sleeve and having a bifurcated arm,

means on said rotatable cam member for actuating said bifurcated arm, whereby to swing the needle carrying arm outwardly .and inwardly at each"revolution of said cam member, means on said cam member for operating said operable record supporting means for dropping a record upon the table at each revolution of said cam member and after the needle carrying arm has been swung outwardly, driving means for said rotatable cam member, including a'friction roller movable-in to and out of frictional contact with the edge of thetumtable, means controlled by the movement of the needle carrying arm for moving said frictipn roller in driving contact with the edge of the turntable, whereby to start rotation of said cam member, and means for positively holding the said friction roller indriving contact with the tufntable after starting rotation'of said cam member and until return of the latterin its starting position, the said friction roller being so arranged as to be pushed out of driving contact with the edge of the turntable by the driving frictional forcetherebetween, as soon as positive holding of said roller in such contact with the edge of the turntable ceases.

2. A gramophone as claimed in claim 1, in which the means for moving thq friction roller in driving contact with the edge ofgie turntable includes a rotatably mounted vertical shaft, an arm secured to said shaft and canying said fric= tion roller, an arm adjustably secured to the upper endof said shaft and extending in the path of the needle carrying arm so as to be operated thereby, a friction means mounted on said shaft and rotatable within relatively close limits relatively to said arm carrying the friction roller, and a segmental arm. secured to the rotatable sleeve and frictionally and slidably engaged with said friction means.

3. An attachment for gramophones having a above the turntable, and displaceable through' rotation of said uprights for dropping said records one at a tiineupon the turntable. arms secured to said rotatable uprights and a spring biased push rod linked to said arms forrotating said rotatable uprights, a framing mounted on one projecting end of said base plate, a cam disk rotatably mountedabout a vertical axis in said framing, a sleeve rotatably mounted in said framing above said cam disk excentrically thereto, a slidable pin fitted in said sleeve and resting at its lower end on said cam disk, a bent arm secured tothe upper end of said sleeve, an arm pivoted to the free end of said bent arm and carrying a pick-up having a reproducing needle, said needle carrying arm extending above the said slidable pin, whereby to raise and lower the needle carrying arm through raising and lowering said pin by the said cam member at each revolution thereof, a lever secured to said sleeve and having a bifurcated arm, means on said rotatable cam member for actuating said bifurcated arm, whereby to swing the needle carrying arm outwardly and inwardly at each revolution of said cam member, means on said cam member for operating said push rod at each revolution of contact with the edge of the turntable, whereby] to start rotation of said cam member, .and means for positively holding the said friction roller in driving contact with the turntable after starting rotation of said cam member and until return of the latter in its starting position, the said friction roller being so arranged as tobe pushed out of driving contact with the edge of the turntable by the driving frictional force therebetween, as soon as positiveholding of said roller in such contact with the edge of the turntable ceases.

4. In a gramophone, a rotatable turntable, a movable arm adapted to carry a reproducing needle, means for supporting a pile of records means including a rotatable cam member and above the turntable and operable for dropping said records one at a' time upon the turntable,

revolution thereof for moving, after playing of a record on the turntable, the needle carrying arm clear of said record, for operating said opermeans controlled by the movement of the needle carrying arm for moving said friction roller in driving frictional contact with the turntable, whereby to start rotation of said cam member, and means for positively holding the said friction roller in driving contact with the turntable after starting rotation of said cam member and until return of the latter in its starting position, said last mentioned means comprising a swingable arm carrying the friction roller, an extension arm adjustably connected to said arm carrying the friction roller, and a cylindrical outer face on the cam member, said face having a recess, and the said extension arm being adapted to coact with said cylindrical face and to enter the recess therein in the starting position of the rotatable cam member. 1 I

5. An attachment for gramophones having a rotatable turntable, in combination, an elongated base plate to be mounted underneath the turntable on the gramophone and to extend at both ends beyond the turntable, means mounted on said base plate for supporting a pile of records above the turntable and operable for dropping said records one at a time upon the turntable, a framing mounted on one projecting end of said base plate, a vertical shaft rotatably mounted in said framing, an outwardly extending arm carried by said shaft, an armadapted to carry a reproducing needle and pivotally connected to said outwardly extending arm, means including a cam member rotatably mounted in said framing and members operable by said cam member at each revolution thereof for moving, after playing of a record on the turntable, the needle. carrying arm clear of said record, for operating said operable record supporting means for dropping a fresh record upon the turntable, and forwmoving the needle carrying arm in engagement with the beginning of the sound groove on the fresh record, driving means for said rotatable cam member, inc'luding a swingable arm mounted in said framing and a friction roller carried by said arm and adapted to coact with the turntable, means mounted in the said framing and controlled by the movement of the needle carrying arm for positively moving said last mentioned arm with the friction roller in driving frictional contact with the turntable, whereby to start rotation of said cam member, and means for positively holding the said friction roller in driving contact with the turntable'after starting rotation of said cam starting position. 7 i

i SVANTEPHILIP ARVIDIUS.

member and until return of the latter in its -30

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