US1040033A - Phonograph-mandrel. - Google Patents

Description

H.,T. SCOTT. PHONOGRAPH MANDRBL.

APPLICATION FILED FBBJ. 1912.

Patented 001;.

IIIIIIII /f/f @l (M- ($00400 'UNITED sTATEs PATENT oruucn.

HARRYT.`scoTT, or Los ANGELES, CALIFORNIA;

rHoNoGnAPIt-MANDREL.

To all whom 'it may concern:` T

Be it known that I, HARRY Tr SCOTT, a citizenpf the United States, 'residing at Los Angeles, in the county of Los Angeles, State of California, have invented new and useful Improvements in Phonograph-Mandrels, of

which the following is a specification.

This invention relatesto an adjustable phonograph mandrel whereby a phonograph 1D record thereon may be accurately placed in longitudinal ducing point.v

In automa-tic phonographs it has heretofore been somewhat difficult to place the record'and the reproducing point always in such relation that the point would immediately engage the sound groove of the record and begin reproduction; and this trouble has been mainly caused by variation of fit'- ting of the records upon the mandrel caused by heat expansion, contraction and warping of the records. For instance, with the mandrel and reproducing point in certain relatin'zto'reachother, one certain record will mil tit on to themandrel so far that its beginning sound groove is far to one side of the reproducing point, while another record will fit so tightly on the mandrel that its begin-l ning sound groove will be'quite al distance on the other Vside of the reproducing point. To allow for this variation it has hereto'- fore been necessary to leave' considrable space between the beginning sound grooveand the reproducing point; and this has necessitated in the averagecase a long rotan tion and travel o f the record before repro duction begins.

`In this present invention it is iny aim `to produce such a mandrel construction as will allow the`record to be 'carried to .a certain predetermined point relative to the= reproducing. needle irrespective of how that vrecordfits upon the mandrel. This object may be accomplished in different manners; and. I have illustrated 'several mechanisms in the-accompanyingdra-wings. But my preferred form of apparatus involves a mandrel which is slidable upon themandrel shaft and which is springl pressed in one direction 'and normally heldby a ratchet mechanism from movement in that direction. 'Means are provided to engage 'witha record and to thereby both press the record on the mandrel and move the mandrel against the'sprngpessure to 'such atpoint` position relative to the repro- I specification of te'ttersratent. .Patentedcnlgmjf Appufiaiibamedfrebmary 7,1912. serial 119,676,079.

ollowing specification a form of device v which is eminently practical, this form and others being illustrated in the accompanylindrawings, in which: l igure lis a longitudinal section of the preferredl formlof myldevice. Fig. 2 is a liperspective view illustrating a detail of conlstruction of4 the form shown in Fig. 1. Fig. is longitudinalvsection of a modified 'forrn. Figi 4 is aplan viewfofthe same. Fig. 5 is a longitudinal section of afurther .modified form.. L i' l; f... I' Referring now particularly@ Figs. 1 and 2 of the drawings, 1.0 designates a suitableA mandrel shaft which, in the form of ma- .chine to which" I particularly propose toV apply this Ipresentvinvention, is longitudijlnally vertically'fmovable. Butitl will be Hilf `'seen from the. following that this. movement v is relative only tothe otherv portions 'ofthey g-mechanism; it will lie-apparent that it`will' suiiice for the shaft '10 and the record support I1 andpthe record engagingstops 12 to be relatively..movable.. Howeven- I will explain the device as it operates. with:` the record support-11 and stops`12 sttionaryf and wlth the shaft 10 moving. vertically. :Shaft 10 has, a'key-way 13l in 'its upper end. @enlarged ati 13l to 'receive a pivoted pawl 14 'having its upper orpawl end 15 engageable" ,with ratchet teeth-16 on' al ratchet bar 17' ljrhounted 'in bore 18 of-mandrel 19. The @mandrel 191 is adapted to carry a record 2O and isvertically slidable on .the shaft.10.` A' fsuitable spring 21 supports the' mandrel, the ilower end of the spring resting on a crillar 22 whichv is 'also -limitedly slidable' on the. shaft 10. The spring 21, normallyr keeps. fthe mandrel inits'upper position `and the isle'eve `22 in its lower position,-the"upvvardmovement of t-he mandrel being stoppedby `verse slot' 25 is cut? in the shaft'4 apin: v.26.gattaciied to thelnawl 1.4.- msts'in the slot be supported in any preferred manner.

25. The pawl is prevented from moving out by the sleeve 22. Immediately above the upper edge of the sleeve 22 the pawl is provided with an outwardly inclined face 2 of such nature that the pawl will be moved inwardly and disengaged from ratchet vteeth 16 when the sleeve 22 is moved upwardly. M eans for moving the sleeve upwardly is provided by a stop 2S stationarily mounted around the shaft 10 and engageable by the sleeve 22 when the shaft 10 moves downwardly. This forms a specific preferred form of release for the ratchet mechanism; but I do not care to limit myself to this peculiar; form nor to the specific time of release hereinafter described.

The record engaging stops 12 preferably comprise suitable rollers 30 revelubly mounted on a shaftor rod 31 which may L A reproducing point 32 is illustrated in Fig. l.

In operatioi'i.. the shaft linoves from a position below that illustrated in Fig. 1 and the mandrel 19 is moved up inside a record p 2O which has been supported on table 11 and raises the record oif the table, carrying it upwardly until the upper edge of the record is pressed against the wheels 30. Further upward movement of the shaft then causes the record tobepressed down on the mandrel so asto properly engage the same and causes the relative downward movement of the mandrel on the shaft. In other words,

'the record is' held in proper position relative to the reproducing point while the mandrel adjusts itself on the shaft. Rotation ofthe shaft then begins and the reproducing point will immediately engage the beginning of `the sound groove and start the reproduction. WV-hen the'reproduction has been finished, 'the vmandrel shaft is moved downwardly andthe ratchet mechanism released in the manner hereinbefore described. The man` drel thereupon moves upwardly and is in readiness for the next operation.

In Figs. 3,4 and 5 I have shown modified forms'of devi for properly placing the record'with relation to the reproducing point. Here I have shown an vexpanding mandrel 19a or 19b constructed in a numberof segments. In the form shown in Figs. 3 and l each' segment is pulled inwardly toward hollow shaft 10a by suitable springs 50. the segment being pivotally supported at 51 on a small plunger' 52. The inner ends of thel plungers are engaged by a suitable cone 53 normally supported in the position shown by a light spring 54. Below the cone 53 a heavierspring 55 connects the cone with a suitable cord 56 which may wind abouta flat take-up drum 57, the lend of the cord being'secured to the drum at 58. When'the shaft 10ZL has moved 11pwardly suiiieient'to unwind the whole length of cord 56, the" cord willfthen Vpull down down between the ends of plungcrs on heavy spring 55 and will move the cone 52. Aarising the expansion of the segmental mandrel. The record has meanwhile been resting loosely around the mandrel on .shoulder 59, the shoulder providing for accurate lon` gitudinal placement of the record.

In F '5 I have shown a slightly different forni of device in which cach segment is supported pivotally und adjustably at the point llon plungers 52b butthese plungers` have downwardly depending inner ends (3() engaging a conical aperture (51 in a movable member (S2 ordinarily supported in the posi-1 tion shown by a suitable compression spring G3. The member 62 is connected to a cord 5G operated in the same manner as cord 5G. Springs 50b hold the segments inwardly, but only with slight force, so that centrifugal force of the revolving segments will overf c'me the springs and force the segments outwardly into proper engagement with the inner surface of a record supported on the llange 591. lllhen the shaft 10b moves upwardly toa suiiicicnt height, the cord 56". draws down on the member 62 causing plungers 52 to be loosened so that the segments may move outwardly by centrifugal action.

Having described my invention, I claim:

1. In combination, a longitudinally mov` able mandrel carrying member, a record carrying mandrel longitudinally movable there` on, and stationary means into engagen'ient with which a record on the mandrel is vmoved by the common movement of lcarrying member and mandrel, whereby the mandrel and record are moved longitudinally on the carrying member.

2. In combination, a mandrel shaft, a recjord carrying mandrell slidable thereon,

yielding means to move the mandrel in one direction on the shaft, releasable means to secure the mandrel against such movement,

and means adapted to engage a record on the mandrel and cause the mandrel to move on the shaft.

which a record on the mandrel is moved by the common movement of carrying member and mandrel, whereby the mandrel and record are moved longitudinally on the carryin g member.

5. In combination, a mandrel shaft, a rec- 133 the mandrel, means for releasing saidl ratchet holding means, and means adapted to engage a record onthe mandrel and cause)4 the movement of the mandrel on the shaft.

7. In combination, a longitudinally movable mandrelshaft, a' record carrying mandrel longitudinally movable thereon, a spring tending to move the mandrel in one directionI on the shaft, a ratchetmechanism holding the mandrel against such movement, a stop adapted, to be engaged by a record on the mandrel, and mea-ns for 'releasing the ratchet mechanism# 8,. In combination, a longitudinally movvable mandrel shaft, a record carrying mandrel longitudinally movable thereon, a collar limitedly slidable on the mandrel shaft, a spring between the mandrel and collar tending to move the mandrel in one direcn tion on the shaft, ratchet mechanism pre'- venting such movement of the mandrel, said mechanism including a pawl movable byv longitudinal movement of the collar, a stop adapted to be engaged by a record on the' mandrel, and a stop adapted to'be engaged by the collar.

9. In combination, a vertically longitudinally .movable mandrel shaft, a record carrying mandrel longitudinally movable thereon at its upper end, a collar limitedly slidable on the shaft below the mandrel, a compression spring between the mandrel and collar, ratchet teeth on the mandrel, a pawl pivoted on the shaft and engageable with said ratchet teeth and having an inclined surface engageable by the sleeve in its upward movement, a record stop above the mandrel, and a stop below the collar.

n 10.l In combination, a Mvertically longitudinally movable mandrel shaft, a record carrying mandrel longitudinally movable thereonvat its upper end, a collar limitedly slidable on the shaft below the mandrel, a compression vspring between the mandrel and collar, a ratchet toothed bar on the mandrel adjacent the shaft, a pawlpivoted-.to the shaft and lying within a longitudinal groove therein with vits lower end within thecollar,

an loutwardly projecting inclined surface on l the pawl directly above the collar, a spring tending. to move the pawl outwardly, a rec- 'ord stop above the mandrel, and a stopb'elow thecollar.

11. In combination, a vertically longitudinally movable mandrel shaft, a mandrel slidable thereon, spring means for movingV the mandrel upwardly onthe shaft, and ratchet means to prevent such movement.

v12. In combination, a vertically longitudinally movable mandrel shaft, a record carrying mandrel slidable thereon, spring means for moving the mandrel upwardly on the shaft, ratchet means to prevent such movement, and a record stop above the mandrel. i y l 13. In combination, a vertically longitudinally movable mandrel shaft, a record carrying mandrel slidable thereon, spring` means for movin-g the mandrel upwardly on the shaft, ratchet means to prevent such 4movement, 4releasing means forsaid ratchet means, and a record stop above the mandrel. 14. In combination, a mandrell shaft, a

mandrel slidable thereon, spring means for moving the mandrel in one direction' on the shaft, and ratchet mechanism to prevent such movement.

In witness that I claim the foregoing I have hereunto subscribed my name this 31st day of J annary, 1912. .i

n HARRY. T; QSCOTT.

" Witnesses: f JAS. H. B ALLAGH,

JAMES T. BARKELEW. i

opies et this p'atent may be obtained for ve cents each,f'by addressing the Commissioner of Patents, Washingtom. C.

Images