US2184369A - Phonograph record resurfacing machine - Google Patents

Description

2 Sheets-Sheet l C. HUENLICH PHONOGRAPH RECORD RESURFACING MAHIE Filed April 18, 1939 Dec. 26, 1939.

TORNEY INVENTOR lmrles /zenlzC/z BY ha Dec. 26, 1939. v c. H'UENLICH 2,184,369

PHNOGRAPH RECORD RESURFACING MACHINE Filed April 18. 19:59 v,2 sheets-sheet 2 l INVENTOR Char/es Nuev; Lc/z Y B ma A ORNEY Patented Dec. 26, 1939 UNITED s'TAT-Es PnoNoGRAPiinEconn -REsURFAoiNG f, MACHINE closed' in thel copendingy applications yof Richard M; Somers, Serial Nos. 215,948 and1232f766, respectively led'June 25,1938 and October-1 ,1938, andV each entitled Phonograph reco-rdshaving machines, which applicationsv are connected by common ownership with4 the present application.

Phonograph record p resurfacing machines of thev form above-mentioned'comprise fajrecordsupportingmandrel, an endgate for the mandrel, m a; carriagebearing a resurfacing tool-l settable vinto operative position relative to a-recordon the mandrel, and driving means operable to roytate the mandreland coincidentally move orjieed 2 the carriage alonglthe'mandrel from a start to the record. Suchtool-record traversalwill cause a iirst or heavy cut to be taken from the record as whenever the tool is set into operative position. For the convenient operation of the 'machine'the driving means is automatically rendered-inoperative when'the carriage is inits terminal position, the driving means being otherwise normally controlled by a control means manipulatable into onA and on positions to start` eLnd'stonv the machine. In order thatvv the carriage may be manually returned to start position, as-for ianother tool-recordtraversal, vit is arranged so that it may be disengaged from its feeding means, this disengagement being commonly effected by 40 an upward tilting ofthe carriage froml normal operative position. To permit' the,l taking offa light or 'nishi'ng out after a 'first or heavy cut has beentaken, there is provided a iinishing-cut controlling means for advancingv the tool'apref- 4l determined distance towardsV the` record; In

takinga finishing cut the carriage willr be returned to start position and thev resurfacing tool will ybe movedfint'o a flnishing-'cutpositiom `whereas in' tak-ing another heavy cut the carriage will be returnedand'the resurfacing tool' willbe reset in anew operative position; When thetool is -to be reset for another'heavy cut; the machineis f stopped as by throwing thecontrol'means to off position, the'carriage is partially returned-to bring a terminal position to `cause the toolto traverse tool isfthenreset; afterwhich thereturnfofi the Y carriage is completed and` the-'controlmeansgis thrown-to on position to-restart thewmachine.

At theicompletion :of a recordfresurfacinggthe record is ejected' fromft'he'machine, asby? ag. suit- '51 It isl an-object of my invention tol prevent' a' change ofrecord on=the machine, subsequent to the Acompletion of 'a recordiresurfacingoperation, C untilfthe manipulatable controlmeans for v the machine is-thrown to offi'positionli` Another objectv of 'my-invention is vtopfreventa change of? record one the f machine asf mentioned above while-the .controlmeans for-the machine is e in on'p'osition andthe resurfacingtooliisg-n operative'position. l Itis another object of fmy invention ytocompel the vthrowing of the` control means i for they ma,- y -chineito offpositiony before the "carriage iszree ..9 turned to take another'rst or heavy'cut; the throwing ofthe control-| means tor.offposition being', however, not" requi'red'in the:y takingv off-a finishing-lout. 1

able recordeejecting means providedI-forz-this purr- It is anotherobject of my'invention: to force 25 v i the operator, at the. completion 'of-a', resurfacing of la record'onthe-machine; to `throw the control means for the machine to off positiondnV order to permit a further ruse of the machine. A-feature offmy invention is to causethe resurfacing r3.0 tool to be released fromr operative position-"as an incident' to such throwing of the-controlmeanay to Itis another vobject of my inventionrto lockthe i endgate in operative' or mandrel-supportingposi- '5 tion as an incidentI to the movementY of'zthe carlriage into terminal' position, and` to automatically render the carriage lockedf against lreturn movement' when the' same hasVV reached' its? terminal position. 1 Y 40 Another'object'isito render-the lockfon-theendgateand' the lock on'th carriage r`each-inoperative as an incident tothe throwing; off the manipu- `latable control means to .offfposition and the 45 return'oi `the resurfacing toolifrom; operativez poy sition. A i

Other and' alliedf objects willf morefullyappear from thefollowing vdescription andthe appended claims; L 1. i

. Inthe description ofmyinvention reier-enceis had tothe following drawings, of which: A

Figure` l isl a topf. plan View of4` a phonograph record; resurfacingimachine-in which my.y inven, f tion. is; incorporated;

.Figure 2;sariahtehandftermal.crSs-slectiehal 55 in parallel relation tothe guide rail I2.

tem of Figure 3, taken substantially along the line* defined by the bottom side offthegbase'plate.

Reference being had to the gures there will be seen a phonograph record resurfacing machine such as is commonly used to resurface 'phonograph records of the type' employed in dictating machines, comprising a base plate I having a left-hand upright standard 2,1an intermediate upright standard 3, right-hand upright standards 4 and 5, and an upright boss 6 directly to the right of the standard 5I APivoted to the boss 6 is an endgate 1.biased into open position by a torsional spring 8 but normally held in closedposition, as shown in Figure l, by an endgate bolt or latch9=pivoted as at I0 to the right end portion II of a` guide rail I 2 extending laterally along the front of the machine. The endgate 1 carriesa conically pointed stud I3 which together with a conically pointed stud I4 carried by the standard 2 forms vright and left thrustbearings kfor a shaft`I5 'extendinglaterally of the machine The shaft I5 extends lthrough an oversizedhole I6 in the intermediate standard 3, and is provided with a mandrel I1 for supporting'a cylindrical record I8 to be resurfaced. j To mount or` remove a record from the mandrel I1 rthe endgate 1 is first'opened to free theright end of the mandrel; during the time the endgate-is open the shaft I5 is intermediatelysupported by the intermediate standard 3 and is retained vin -engagement with the conical stud I4:A bythe contact of a collar I9, secured to the' shaftfby ay screw I9', with the left side of the intermediate standard 3. f`

Parallel to the shaft I5 and guide rail I2 is a longitudinal rod 2'supported by the left and rightv standards-2 and 5. Slidably and tiltably mounted .on the rod 20 is acarriage 2| having a-sleeve 22 embracingthe rod. As shown in Figure 2 the `'carriage is provided'with `an arm 23 curved forwardly over the -mandrel I1 and terminating in a shoe 23 which normally slidablyrests on the guide rail I2. The carriage is steadily moved or fed in a leftward direction across Vthe'mandrel (as from-a start position at the right end of the mandrel to a terminal position at the left end of the mandrel) by a laterally extending feed screw 24` rotatably supported by theleft and right standardsr 2 and 4. Secured to the carriage sleeve 22 by the pins 25 is `a resilient and rearwardly extending arm 26 carrying a feed nut 21 which normally envgages the underside of the feed screw. When with the feed nut 21 being in engagement with the feed 4.screw 24, a rotatinj'of the feed screw willcause a-slow' steady ymovement of the carriage. In order that such feeding of the carriage will occur coincidentally with a rotation of the mandrel the feed screw is provided with a pulley 30 which is coupled, as by a belt not shown, to a pulley 3| on the mandrel shaft I5. In theoperation of the machine the mandrel I1 and feed screw 24 are turned in a clockwise direction, the direction of thread on the feed screw being` such as to then cause a leftward feed of the carriage.

On the right side of the carriage there is an extension 32, square-shaped as viewed from the yend, which substantially overlies the rod 20.

The extension 32 carries a resurfacing tool 33 comprising a knife blade 34 mounted on a knife on the extension 32, guided by a guide rod 31,

and coupled to the knife bar 35 by a compression spring 38 coiled about the knife bar between the Vcap 36.and a shoulder 35 on the knife bar, this coupling serving toyieldably move ,the knife bar downwardly towardsthe record when the cap 36 is moved downwardly. The cap 36 is urged upwardly bya spring 39 coiled about the guide rod 31,'but upward movement of the cap 36 relative to ther bar 35 is limited by ahead 40 on the bar. By reason of theupward biasing of the cap 36 the knife bar isl normally maintained in inoperative position, this position being defined by the contact of a collar 4I on the bar 35 with the underside32 of theextension 32. The setting of the tool 33 is `controlled by a lever 42 pivotedv on thev right side of the extension 32 and having ya short arm 43 which is coupled to the cap 36 by Van angular link 44, the link being pivoted to the arm 42 by a-pin 45 and to the cap 36,by a pivot screw 46. As the lever is` swung forwardly inla counter-clockwise direction the cap 36 and knife bar 35 are moved downwardly, the tool being. moved into operative position relative to the record; in the terminal movement of the lever a lock 41, described in detail in the abovementionedBrown patent, is rendered operative to hold the tool in operative position, thereby setting the tool. Such forward or setting movement of the lever 42 is limited to the position shown -in Figure 2 by the impingement of the link 44 with the hub 42 of the lever. When the lever is in this most forward position the pin is slightly past dead center with respect to the pivot axes of the lever 42 and the pivot screw 46. The upward biasing force exerted on the cap 36 `then causes the lever 42 to be urged in a counterclockwise direction-the direction in which the lever 42 is moved to set the tool-but movement lof the lever in such direction is prevented by the contact of the link 44 with the hub 42. 'I'hus when the lever 42 reaches such limited position, the lever is releasably held there to maintain the tool in operative position. When the lever 42 is, however. tripped, or moved slightly in a clockwise direction, to return the pin 45 across the dead center line aforementioned, the lever 42 is `returned and the cap 36 is moved upwardly, as

byj the. spring 39', to render thel'ockf. V41 inoperative 1 andthereafter to.return thertooltoinopera- Ativep'osition.

In the; operation of. the machine the resur- `10 of the carriage along. themandrel'. As-the carriage` is. thus. fed along the mandrel a rst or heavy cut is taken from the record, the cut-away layer-commonly. known. as shaving chips-being. carried.v by. achip-chute 48 downwardly 15.l through an opening 48' in the base plate.

' The driving-means for the machinethe means for feeding the carriage and rotating the mandrelf--may comprise a suitableY electrical motor M1 which maybe locatedbeneath the base plate 202 lf and be coupled to a pulley 49 on the mandrel shaft l'- by a. belt (not shown) which may pass through an: opening 5U in the base plate. To control the motor M there is provided'an auxiliaryy switch 5I and a main switch 52 which are 25 serially connected in a power supply'circuit 53 for the motor, the circuit. 53 being adapted to make connection with a suitable sourceof power by way ofaplug 54', as is schematically shown in Figure 2.

30' The auxiliary switch 5Iy comprises a casing 55 Vpreferablyy of suitable insulating material, se-

cured bythe screws 56 to the top side of the base plate-in the rear left-hand portion thereof. This casing insulatedly carries left and right Vforwardly extending'` contact springs 51 and 58 mounted incantilever fashion on a stack- 59 and biased` into contact with each other. In the rearward side of the casing there is an opening li!)A froml which extends a cable 5I by which the switch is connected in thel circuit 53, andv in the forward side of the casing there is an opening 62 from which extends an insulating barv 63 lsecured to the left contact spring 51. Secured to the rearward part of the carriage by ay screw 64 is a'downwardly extending arm 54 which,

as the carriage moves into its terminal position impingesagainst the bar 5?k to move the contact spring 51`leftwardly out of contact with the contact spring- 58, thereby opening the circuit 53 to stopthe machine.

The main switch 52 is preferably of the singlepole single-throw toggle variety adapted to snap into its cn and olf positionsand is mounted on the underside ofthe baseplate in the front right-hand portion thereof. This switch is con,- trolled' by a forwardly extending control lever 65 having a shaft 65' extending downwardly through a'boss 55m the base plate. Secured to the lower end of the shaft 65 bya shoulder 60 screwv Slis a plate 68 havingarearwardly extending arm 69 carryinga sl0tted, pivot ed`stud through which slidably passes an actuating arm 'H of the switch 52. When the control lever 65 is rocked leftwardly and'rightwardly the 65 arm 1| is moved rightwardly and leftwardly to place the switch in its respective on and off positions, the arm 1! snapping into its leftward and rightward' positions by reason of the toggle nature of the switch.

70 When the carriage is moved into its terminal position, as at the completion of a `cut on the record, the machine is stopped by the switch 5I (as above explained) ,thereby permitting immediate inspection of the record. When the car- 75 riage is returned from its terminal position the switchgl closes;.byirreasong` of its biasing,.to`start .-...ther-machine; unless' of: course the. switch 52 is thrown to offA position prior to the return of the carriage. Whether or Anot the switch 52 will Y berst thrown to..oif. positionl isin accordance with. my.- invention; as` hereinafter described, dependentupon the action toibe performed subsequent'. tothe completionv ofv the first or heavy cut on; the; record.

record ofza lightor nishing character to obtain I an'A added smoothness1of the record', the taking of; another heavy cut, or the'ejecting of a record from; the machine. The means for taking a light or.` finishingscut on the record4 is now. described.

On. the carriage arm 23" there is provided a nishing-cut controllingfmeans operable to move or. advance the set tool a slight distance towardsV l the record;r This finishing-cut controlling means comprisesI a short. rod 12l mounted for pivotal movement abouty itsv longitudinal axis and 'extending through the shoe 23? ofY thecarriage in parallel relationy tothe. guide rail; projects radially. along its. length below the shoe 23!` throughout a.. minor portion of its periphery sothat the carriage arm 23is normally supported bytheguide railbyrway of't-he rod 12. The rod 1is, however, provided with a flat 13throughout "i its length. When therod; is turned to bring the flat 13 intcicontactxw'ith the guide rail, the carriage arm. isLl'owered'slightly to advance the tool towardsv the record. On: the rod 12 there is a forwardly extending' bracket 14 by which the rod" may be manually turned.` When. the bracket 'i4 is in theposition shown in Figure 2, the at 131 isoi theguiderail I2 and the finishing-cut controlling means is in inoperative position;

when Athe bracketA is, however, movedI upwardly intoV a position such as` is indicated' in dash-dot lines inv Figure 2; thel flat 13' is in contact, with the guide rail andi the finishing-cut controlling means is in operative position.

When a record: is to be removed from the ma.- chine the endgateis first openedf and then there is operatedv a record-ejector, well known in the art, which` comprises ahandle 1'5 integral' with a hub and an upstanding arm 16, the hub being' secured* by a screw 11' to a short rod 18 pivotally'supported at one end by the guide rail l2 andat the other end by the intermediate standard'V 3i.. Thear-m 16' carries a shoe 19'bearingf ar cushion 301 lying directly to the left ofthe record. 'Ihey rec'ordeejector is normally maintainedl in any unoperatedr position, shown in Figure l?, by a coil spring BIZ. In the operation of the e-jectorthefhandle 15 is raised against the force of the springl 8|* so as to move the cushion '3D rightwardly against the record to push the record-ofthe mandrel; l n

Usually operated" coincidentally with the record-ejector is a mandrel'brake. This brake com- -tothe ar-m16the shoe 831isyieldably moved into contact themandrelA to retard' the rotation In the normal use of thel machine there are@ three actionsv which:l may be' .performed at the completion ofv such. first out vonithefrecordi: theta-king. of-another cut on the The rod 12 of thev mandrel as the record-ejector is operated.

Of the three actions aforementioned which may be selectively performed at the completion of a first or heavy cut on the record only the taking of a light or finishing-cut does not involve the release of the resurfacing. tool from its original setting. When a finishing cut is to be taken it is only'necessary to move the bracket 14 upwardly to render the finishing-cut controlling means operative, tilt the carriage upwardly and then manually return it to its start position. When this is done the machine is restarted by the closing of the switch 5|, the switch 52 having been left in on position. When the carriage is lowered upon the guide rail in its start position it will be next fed leftwardly across the record and the record will be rotated to effect the finishing-cut operation. However, if it is desired to take another first or heavy cut on the same record or to eject the record so that another may be mounted on the machine to be resurfaced, the resurfacing tool will in each case have to be released so that it may be later reset. It is also necessary that the switch 52 be thrown to off position so that the record will not be set in rotation when the carriage is returned from its terminal position for the purpose of placing the tool in a position overlying the record to permit the resetting of the tool. It is particularly important when there has been a change of record on the machine that both the tool be released to inoperative position from its prior setting and that the switch 52 be thrown to off position before the carriage is returned to reset the tool in order to avoid possible scraping of the tool on the record in the return of the carriage, such scraping being particularly likely to occur whenever the newly mounted record is of greater diameter than the preceding record. In accordance with my invention, when a first or heavy cut has been taken on the record the operator is compelled to throw the switch 52 to off position and to release the tool from operative position before he may make a change of record on the machine or return the carriage to permit a resetting of the tool, this compelling means being, however, arranged to permit the carriage to be returned for the taking of a nishing out on the record, as hereinafter explained.

The compelling means abovementioned may be in the form of means for locking vthe endgate in a mandrel-supporting position and of means for locking the carriage in a terminal position, the latter locking means being rendered inoperative by the movement of the finishing-cut controlling means to operative position so as to permit the taking of a finishing cut, but each of the locking means being rendered inoperative when the switch 52 is thrown to off position. In order that the tool will be released from operative position when each of the above locking means is rendered inoperative, a tool release is effected as an incident to the throwing of the switch 52 to off position. A means for so releasing the tool from operative position is disclosed in Heunlich Patent No. 2,095,332, issued October 12, 1937 and entitled Record shaving machines.

A tool-releasing means of the form abovementioned comprises a link 81 carrying a pin 88 in its forward end portion which engages a cam slot 88 provided in a rightwardly extending portion 89 of the plate 68, the link extending rearwardly along the right side of the machine beneath the base plate to pivotally connect with a right arm 90 of a lever 9| pivoted by a screw 92 to a boss 93 extending down from the base plate. A left arm 94 of the lever 9| is pivotally connected to the right end of a bar 95 which extends laterally of the machine along the rear edge of the opening 48 slightly within this opening. The bar 95 is supported at its left end by a link 96 pivoted by a pin 91 to the bar and by a screw 98 to a boss 99 extending down from the base plate, the link 96 and arm 94 forming a pair of parallel motion supports for the bar 95 to permit the bar to move forwardly and rearwardly in parallel movement.

On the right side of the carriage 2| there is pivotally supported, by a relatively long shoulder screw |00, a lever best shown in Figure 2.;

The lever |0| operatively connects the bar 95 with the tool-setting lever 42 and comprises a lower vertical portion |02 slidably contacting the front edge of the bar 95, a central semi-circular portion |03 curved about the carriage sleeve rearwardly thereof and pivoted at its upper end on the shoulder screw |00 adjacently of the right side of the carriage, a bail portion |04 extending along the screw |00, and a forwardly extending arm portion |05 pivoted on the outer end of the screw |00 and terminating at a point directlybelow the arm 43 of the tool-setting lever.

The cam slot 88 is arc-shaped and has at its rearward end an inwardly extending notch |06 in which the pin 88 is normally retained, as;

whenever the lever 65 is in a leftward position to place the switch 52 in on position, by a tension spring |01 which urges the link 81 leftwardly and forwardly. The link 81 extends forwardly and leftwardly from the pin 88 and ter-g minates in a cam face |08 adapted to impinge against the boss 66 when the control lever 65 is A moved rightwardly to place the switch 52 in off the tool from operative position. In the further.

movement of the control lever 65 to place the switch 52 into off position the cam face |08 impinges against the boss 66 to limit lthe leftward movement of the link 81, the pin 88 being then moved out of the notch |06. When the pin 88 is free of the notch |06 the link 81 is moved forwardly by the spring |01, with the pin 88 coming to rest in the forward end portion of the cam slot 88', the forward position of the link 81 being defined by the engagement of a lug 94 on the arm 94 with the rear edge of the bar 95.

In the leftward movement of the control lever 65 to place the switch 52 into on position, the pin 88 slides rearwardly relative to the cam slot 88' and comes to rest in the notch |08, the bar 95 remaining stationary. Thus it is seen that a throwing of the switch 52 from off to on position will not disturb a prior setting of the tool.

The means for locking the carriage in its terminal position comprises a vertically disposed latching member |09' at the left end of the guide rail I2 (see Figures 3 and 4). This latching member is provided at its upper end with a catch |09 `arranged to overlie the left end of the rod 12 in .the carriage shoe 23 when the carriage is in its y member and a pin IIE bnit-he armnlrl I 1, the op- Vertical as shown in Flgurefeb'y ten' --:.the Contact of the carriages-hoe zlfwith the `tattili f IGS', to cause -a lokin'g Vofthe -ehdga'te VI Ama `loe effected by a' locking of the endgatelath 24. The etching-member ma vis1t i vott=,d )oy-ja- I-IfU vto an arm I-'II turned tipi." n which extends laterally of the mfa ine Il'g'eloyv-'the base plate, thearm 'i I I'pa'ssfgfthrough; ing H3 inthe basepla'te to the left 'of' v rail I2; The latchfing meriib'ehr Ijflgilsjnorrlnaljlly retained in an operative etlatehi'ng @Sitten position in which 'the `me'nber is fsu" tf'ant`ia11l3-/A II4 eonn'ected'between 4a bin i Itiio the erative vposition vof the latohinfgfme'z'nlole beingde -k hed by the Contact ofthe latching memb'eij with The ,hat it' 2 is siidably mounted for limited it'iotfe-V ment laterally 'of the ina'htfe by means 6ta riait of left and right sholde sort-:Wsy IISand `I 'ISl`v which respectively pass' thr'oigh "slotsf IIB and I IS in the bar to thread into the respective ltfqsses;v IIS" and IIS" extending dow'rlfr'om the' base j` plate. This slidable mounting for the bar IIZYfis provided in order that the bar maybe movedbs'( the terminal movement of theYoariage;l as Y by'f closed oi* mandrelsupporting position; as is here'' nater described. l y The looking of theendgate iriayvery suta in operative position; The locking means' Vfor?` th endgate latch comprises a slide `I2` which is mounted on the1-back side ofgthejgiiidefail "I by means of a pairY otshoider sdrews -r-zlfwrne pa-Ss through slots I2l the slide-to' respetiifely thread into a pair of 1Vbosses IBI wheheiterfid-ffrearwardly of'tlieguideral. The slide 'IZB :'s'dis l* posed at the level of the eidgate latch S andha Figre At the 'right end 'rearwardly exits tight end tm'tto'n tzt' offset sitghtiy' to the rar- 9 fof the endg'ate latch there isprvided 'an ,exi-'' tension S" which is' just free from the end rior-l tionA 29" ofthe slide IVZIlWh'eh the Sli'deis' `iriit's ;,most leftward position, as is shown n l'f;

a har 2F22 which's-dispo'sed,y partially along' its length, :directly beiow thebat 'm2, "riie'ba'r'v |22A is sldably mounted oriiovement laterally f the :.machine, the same as .thelbar IIZithe'lbarfhinlgf Siidably retainedto thebat n2' ivy astiqplde'r, screw I23 Whichpasses'thifoughaslot F24Jv bar I2'2-to threadinto the bar IjI2 andfbeing'fa y slidabiy supbbrtedjby the's'ir'evt Ilt a whichtprssejsi tween the bar 22 and the bar I I2 are the.spacers`-V i265 and I flrespectively' emh'rao'ingfthe' screws 12a and rre-'i Y The'ba'r tzzis urgeleftwrdiy ativeto the bar H m'ymettnsf qta-teilen ,sprm

se tendenti@ the.' mating meant forv the @at-'nage' When the carriage the 'kpin videdl on the end of an arm |43 extending leftwardly from the bar |22, contacts an arm |44 extending downwardly from'the latching member |09l Y'(see Figures 4 and 5), thereby turning the lat'ching member |09 in a counter-clockwise direction to unlock theA carriage from its terminal position. l v

y -Although `I have herein shown and described oneembodi'ment of my invention, it will be understood that this embodiment is subject to many changes and modifications without departure from the scope of my invention, which I undertake/to express according to the following claims.

A1. In a phonograph record resurfacing machine having a mandrel for supporting a record to be resurfa'ce'd:l the combination of a movable endgate retainable in a mandrel-supporting posi- "tion; a tool-carriage movable along said mandrel into'j terminal position; and means, operated incidental to the `movement of said tool-carriage into terminal position,`for locking said endgate in its mandrel-supporting position. f 2. In a phonograph record resurfacing machine having'a record-supporting mandrel: the combination'of a movable endgate for said mandrel;

meansfor locking said endgate; a tool-carriage .movable relative to said'mandrel; and means, v

operated by said tool-carriage, for rendering'said endgate locking means operative. in,

3.v lIn a phonograph record resurfacing machine" having a record-supporting mandrel;` the ,com-n Abination of a movable endgate for said mandrel; s an endgate locking means; la tool-.carriage movable along said mandrel; a control means for the.V

machinev having on and nolf positions;'and

means, jointly controlled by said tool-carriage." and said control means, for controlling said lock-l ingmeans. l

'4. Ina phonograph record resurfacing machine" having a record-supporting mandrel: the'combination of a movable endgate for said mandrel;

an endgate locking means; atool-carriagemov- -able` along ysaid mandrel; a control means for the machine having on` and ofpositions; means, controlled by the movement of said tool-carriage, for rendering sai-d locking means, operative; and

means, controlled by said control means, for rendering said locking means inoperative.

5. In al phonograph record resurfacing Vmachine Vhaving -a record-supporting mandrel: the

combination of an endgate for said mandrel rel tainable in a mandrel-supporting position; meansv for locking said endgate in said mandrel-supporting position; a tool-carriage movable relative to said mandrel into a terminal position; a control means for vthevmachinehaving on and olf positions; means, operated incidental to the move- "ment of said tool-carriage into said terminalv tive to said mandrel; means for locking said "inoperative.

position, for rendering said locking means operative; and means, operated as an incident to the movement of said control'means from on to off position, for rendering said locking means 6. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an endgate for said mandrel; endgate locking means; a tool carriage adapted tool-carriage against manual movement; a control means 'for the machine having on" and -,.offf,postions; andv means, controlled by said mais@ control means, for controlling bothy said endgate locking means and tool-carriage locking means.

7. In a phonograph recordresurfacing machine having a record-supporting mandrel: the combination of an endgate `for said mandrel retainable in a mandrel-supporting position; means for locking said endgate in said mandrelsupporting position; a tool-carriage movable relative to said mandrel into a terminal position and returnable therefrom; means for locking said tool-carriage against return movement fromL said terminal-position; a control means for the machine having on and off positions; and means, operated incidental to the movement of said control means to off position, for rendering both said endgate locking means and tool-carriage locking means inoperative.

8. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of a movable endgate retainable n a mandrel-supporting position; means for locking said endgate in said mandrel-supporting position; a tool-carriage; driving means for feeding said tool-carriage along said mandrel into a terminal position; means for stopping said driving means and for rendering said endgate locking means effective by the movement of said tool-carriage into said terminal position; means for locking said tool-carriage in said terminal position; manipulatable control means operable to'start and stop saidfdriving means when said tool-carriage is out of said terminal position; and means, controlled by said manipulatable .control means, for rendering said tool-carriage Clocking means and endgate locking means inoperative.

In a phonograph record resurfacing machine having a record-supporting mandrel: the combinationof an endgate; a latch for retaining said endgate in a mandrel-supporting position; a tool-carriage movable across said mandrel into a terminal position; means operated n, incidental to the movement of said tool-car- 'riage into said terminal position, for locking saidv endgate in a mandrel-supporting position;V

a carriage; a resurfacing tool on said carriage settable into operative position relative to a record on said mandrel; driving means for feeding said carriage' across vsaid mandrel into a terminal position; a pair of serially connected on andoff switches for controlling said driving means; means for locking `said latch in opera-- tive position; means for moving one of said switches to o position incidental to the movement of said carriage into terminal position;

means for locking said carriage in said terminal position; and means, operated incidental to the throwing of the other of said switches to olf position, for rendering the locking means for drel-'supporting position; means for locking said endgate in said mandrel-supporting position; a. resurfacing tool settable into operative position relative to a record on said mandrel; control means for the machine having on and off positions; and means, operated incidental to the moving of said control means to oi position, for rendering said locking means inoperative and for causing said tool to be moved out of operative position.

12. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an endgate movable into a mandrel-supporting position; a carriage movable along said mandrel into a terminal position; a

resurfacing tool on said carriage movable into n operative and inoperative positions relative to a record on said mandrel; means for locking said carriage in said terminal position; means for locking said endgate in said mandrel-supporting position; means movable into on and off positions to control the operation of the machine; and means, controlled by said control means, for concurrently moving said tool to inoperative position and rendering both said endgate locking means and carriage locking means each inoperative.

l CHARLES HUENLICH.

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