US2209836A - Phonograph record resurfacing machine - Google Patents

Description

July 30, 1940. L. z. LA FOREST PHONOGRAPH RECORD RESURFACING MACHINE Filed April 26, 1939 4 Sheets-Sheet l July 30, 1940. l.. z. LA FOREST 2.209,836

PHONOGRA'PH RECORD RESURFACING MACHINE Filed April 26, 1939 4 vSheets-Sheet 2 i? 62 mill w 139 5 QI v 26 I n @l 11 2.614

will mi g L; f" h Y 612 k 47 \4g\l E8 sa INVENTOR MLM ORNEY l g 102 l July 30, 1940. L. z. LA FoREs'T PHONOGRAPH REC-0RD`RESURFACING MACHINE 4 Sheets-Sheet I5 Filed April 26, 1939 gil Fores ORNEY I'NVENTOR [au15 Z, BY Y mwN OWN. .GNN NNN July 3o, 1940. L.; A-FOREST 2,209,836

PHONOGRAPH RECORD RESURFACING MACHINE Filed April 26, 1939 4 Sheets-Sheet 4 A ORNEY Llo Patented July 30, 1940 UNITED STATES L zzogirskg PHON GGRAPH RECORD RESURFACING.

Loui'sZJLaFoi'est, Orange, N."`J.,'assigno'r to I"I honias A. Edison, Incorporated, West Orange, Nid.; av corporation of` New Jersey v v vApplicatie'n April 26, 1939,- serial No. 270,109y

' zifolaims. (o1. 8.2-1.1)

This invention relates to machines ,forresurfacing phonograph records,` particularly records of the type intended for use withdictating machines. The inventionr is especiallyconcerned with improvementsfin record resurfacing machines which will facilitate their lopera-tion and safeguard the machines from such improper use as may result in damage-to the. machine orfto the records to be resurfaced., s l

Phonograph record resurfacing machines .of the form abovementioned comprisea record support or mandrel, an endgatel for the mandrel movable into operative or mandrel-supporting position, a carriage movable along the mandrel, and :auresurfacing tool on the carriage settable into-.operative relationship to a record on the'rnandrel. When the tool is set a-first or heavy out will be taken from the record upon rotating the mandrel and feeding thecarriagetherealong, -a suitable driving means being provided to concurrently. effect the mandrel rotation and'Y carriage feeding. Atthe completion ofi such rst cut a suitable nishing-cut controlling means may be operated to advance the tool slightly towards thefrecord so that a light or finishing cut may next be taken to obtain an added smoothness of the record surface. The resurfacing tool is a' delicateV instrument and is to be set on the record only under certain proper conditions in order to insure not only that a proper depth lof cut will be made by the tool but also that the tool will not be set under such conditions as will caus'edamageto the 'tool or record. f

It is an object of my invention to provide means to insure a proper setting of'the tool on the record.

It is another object of my inventiontoprovidek means to prevent the operator from-accidentally means will be in inoperative position as thetool is set.

It is another object of my invention toautomatically return the finishing-cut controlling means to-inoperative position by the release of the tool from a` set position. 2 Another `object vof my invention is to automatj ioally return both the tooland' finishingcut controlling means to inoperative position upon the 'stopping of the machine.

v It is a feature of my invention to prevent the setting of the tool on the record when either the machine is in operation or `the endgate is out of a mandrel-supporting position.

Another feature, of my invention is to provide means to permit a setting of thetool only when the carriage is in a predetermined position in its path of movement.

Other objects and features of my invention will more fully appear from lthe following description and the appended claims.

In the description of my invention reference is had to the accompanying drawings, of which:

. Figure 1 is atop plan view of a phonograph record shaving machine inwhich my invention is incorporated;

Figure 2 isa vertical sectional view taken sub-y stantially along the line 22 of Figure 1;

Figure-3 isa horizontal sectional view taken substantially along the line.l 3-3 of Figure 2; Figure 4 is afractional vertical view, partly in section along the line 4-4 of Figure 2 .and showing details of the means for controlling the setting of the tool;v 1. I

Figure 5 is a-front view ofthe mechanism of figure 1, partlybroken away and partly in sec- Figure 6 is a fractional, horizontal sectional view taken substantially alone line 6 6 of FigllI'e15;^': 51': I

Figure 7- is a fractional, vertical sectional View taken substantially along the line 1-1 of Figure 5;t

Figure 8 is a fractional top plan Viewv of the mechanism of Figure l, showing details of parts of my invention; and

Figure 9 is a front elevational view of parts of the mechanism of Figure 8,- a portion of the frame of the machine being shown'in dash-dot lines.

Reference being had to the figures, particularly Figures 21 and 2, there will be seen a phonograph record resurfacing machine comprising a frame having a base plate I with a left-hand standard- 2, right-handstandards 3 and 4 and an intermediate standard 5f.Y Pivoted on a boss, which eX- tends up from the base Iplate to the vright of the standard 4, is an endgate 1 normally held in closedposition, as shown in Figure 1, by a latch 8 pivotedk at 9 to the right end of a guide rail lll' which extends laterally along the forward part of the machine. Supported bythe left standard 2 and by the endgate 1 are respective conically pintedfstuds lil" and `f|2P which` form a pair ofy left and right thrust bearings for rotatably supporting a shaft I3 in parallel relation to the guide rail II). The shaft I3 passes through an oversized hole I4 in the standard 5 and carries a mandrel I5 for removably holding a cylindrical record |6 to be resurfaced. In the mounting of a record on, or the removal of a record from,I the mandrel the endgate is first swung open to free the right end of the mandrel. When the endgate is open the shaft I3 is intermediately supported by the standard 5-the mandrel being permitted to fall a small distance-but is retained in engagement with the stud II by the abutment of a collar I1, secured to the shaft by a screw I1', against the left side of the standard 5.

The mounting of a record on the mandrel is done by manually placing the record in a position on the mandrel wherein the record telescopes the mandrel. The removal of the record from the mandrel is, however, done by means of an ejector. This ejectory is wel1 known in the art and is sufhciently described in the present instance as follows: A handle I8 Iisintegrally formed with an upright arm I9l and is pivoted on a pin 20 which is supported at one end by the intermediate standard 5 and at the otherA end by the guide rail I9. The arm I9:- carries a shoe 2| lying to the left of the record but normally held out of Contact with the record by a torsional spring 22, constrained at onetend by the base plate and at the other-end byl the handle I8, which retains the` ejector in unoperated position. When the ejector is operated, as by lifting the handle I8, the .shoe` 2| is moved against the record to.push the record off'the mandrel'. Yieldablyv connected with the-arm la ofl the ejector I8, by. a torsional spring 23, is a mandrel brake 24 carrying a shoe 25. As the ejectonis operated the shoe 25 is yieldably pressedlagai-nst the left end of the mandrel to retardl theJ mandrel against rotation. For a detailed description of this combination of record ejector and. mandrel brake, reference is had toHuenlioh Patent No. 2,128,646, issued August 30, 1938 and entitled. Braking and ejecting mechanisms.

Supported by the left and righ. standards 2 and 4, in parallel. relation tothe. guide rail I0, is a rod 2.6 on which there. is slidably and. tiltably mounted a carriage 21 having a sleeve 21 em.- bracing the rod. The carriage 2.1, which may be a casting, comprises a relatively. narrow arm 28 extending up from the rod 26 and an arm. 29 extending forwardlyfromthe: arm 28' over the mandrel I5, the arm 29 terminating in a shoe 29 which normally slidably rests on the guide rail I0. The arm 2.9 is. increased; in width; in a rightward direction, as at 29.-", andi ishollowed out from the underside to provide a recess 3D in which there is providedl amechanism hereinafter described. To move the carriage steadily in a leftward; direction along the mandrel (as` from a start position at the right end ofl the mandrel into a terminal position at the leftend of the mandrel) coincidentallyy with a rotation ofy the mandrel, thereis provided a laterally extending feed screw 3|. rotatably Supported? by; theleft and right standards2 and 3 and havingr a pulley` 3 2.; adapted to` be. coupled, as by a; belt (not shown), to a pulley 33` on the shaft I3. Secured to the carriage sleeve 21;', by the screws` 3 4- is` a. rearwardly extending spring arm- 35; carryingv a feed nut 3,6. This feed nut is held in engagementwith the feed screw 3j; whenever` the carriagearm 2,9 is restinggon the guide rail; however, whenever; the marriage arm! 2,9, is raised to tilt the carriage the feed nut 36 is moved downwardly out of engagement with the feed screw, thereby freeing the carriage so that it may be manually moved along the mandrel at will. To limit the upward tilting of the carriage there is provided on the carriage a downwardly extending post 31 which is adapted to impinge against a ridge 38 provided on the base plate.

On the right side of the arm V2il'of the carriage 21, substantially overlying the rod 23, is an extension 39 which is square-shaped as viewed from the end.A The extension 39 supports a resurfacing tool comprising a knife bar 40 and a knife blade 4| provided at the inner end of the bar. The bar 49 is slidably mounted for radial movement relative to the record. The means for setting the resurfacing tool into operative position-a position in which the knife blade 4| engages the record--and for releasing the same may comprise the well-known construction disclosed in Brown Patent No. 2,137,383, issued November 22, 1938 and entitled Record shaving machine.

In the construction abovementioned` the knife bar 40. is biased away from the. record, and, in the. setting of the tool, is yieldably moved towards, the record into operative position, the tool being then locked in such position. This toolsetting means is sufficiently described by the following statements: A cap142= is secured to a guide rod 4.3.which is slidablyl supported by the extension 39v in parallel relation to the knife bar 4|). The knife. bar 40 passes. through the cap 42 and terminates in a head 44.. The cap 42. is biased upwardly by a compression spring 4 5 coiled, about the. guide rod 43between. the extension 39. and the cap 42. This upwardl biasing of the cap,r causes the resurfacing tool to be normally maintained in inoperative position, as by the contactY of the cap 42; with the head 44 the inoperative position ofthe tooly being defined by` the contactV of a collar 4,0 on the knife bar: with the underside of the extension 39. When` the cap 42 is moved towards the record; the knife bar 4 0, is, yieldably moved therewith byv means of a compression spring 46 coiled aboutY the knife bar between a shoulder 4,0 onk the bar; and thev cap, 42. The cap 424 isy controlled by a liever 4.14 p voted as at 48. on theY righi SideA Off; the extension 3,9 and coupled to the cap 42` byan angular` linkl 49 whichI is pivoted, by a pin, 59; to the lever 41 and by. a shoulder screw.- 5 toM anear 52 turned over from 'the cap- 42.

When the lever 41 is turned in a counter-clockwise direc-tion thecap 421s moved downwardly to movethe tool intQ operative position, relative to the record, the terminal movement of the lever causing a pin4 53 to be pressedl against the knife bar. 40 to lock the tool in its operative position, as is described in the abovementioned Brown patent. The terminal position of the lever 41 shown in Figure 2, is defined by the imp ingement of the link 49 against the hub 41. ofthe lever 41. When the lever` 41' is inthis terminal position, the pivot or pin 50 is slightly past dead center with respectto the pivot axes of` thelever 41 and of the screw 5I. The lever 4'1 is then urged in a counter-clockwise direction into its terminal position by the upward biasing of the cap 42. Thus the lever is releasably held in its terminalposition, thetool being then locked; in its operative position. When the lever 421= is, however,- tripped-i. e., moved slightly in a clockwise direction to return the pin 59 across the dead center line abovementioned-the upward biasing of the cap 42 will' cause the tool to be unlocked', aslby.

the clockwise turning of the lever 42, and'` then returned to inoperative position. This tool setting and releasing means may be suitably enclosed by a cover 28 fitting the carriage. Y

When the tool has been set into operative position and the carriage has been returnedto start position the machine may be put into operation to cause a first or heavy cut to be taken from the record, this cut-away layer-commonly known as shaving chipsbeing carried by a chip chute 54 downwardly through an opening 54'- in the base plate, as for example, into a suitable container (not shown). The driving means forthe machinei. e., the means for rotating the mandrel and feeding the carriage-may comprise a suitable electrical drive motor (not shown) which may be located beneath the base plate` I and be coupled to a pulley 55 on the shaft I3 as by abelt (not shown) which may pass through an opening 56 in the base plate. l v

The drive motor may .be controlled by a suitable single-pole single-throw switch 51, preferably of the toggle variety, which may be secured to the underside of the base plate Lby a bracket 58 in the forward right-hand portion of the plate. The switch 51 may be manipulated into its on and olf positions by a forwardly extending lever 59 pivoted in a boss 6U extending downwardly from the base plate and connected by a shoulder screw 6l to a rearwardly extending arm 62. The arm E2 carries a slotted, pivoted stud 63 through which slidably passes an actuating arm 64 of the switch 51. When the lever 59 is moved leftwardly and rightwardly the arm 64 is moved rightwardly and leftwardly to throw the switch 51 into its respective on and off positions, the lever 59 snapping into its respective leftward and rightward position by reason of the toggle nature of the switch.

After a first cut has been taken on the record it may be desirable to ltake another cut of a light or finishing character in order to obtain an added smoothness of the record. To facilitate the taking of such a finishing cut there is provided a finishing-cut controlling means which is operable to advance the resurfacing tool a slight distance towards the record without disturbing thesetting of the tool. This finishing-cut controlling means comprises a short rod 65 mounted for pivotal movement about its longitudinal axis and extending through the shoe 29 of the carriage. 21 in parallel relation to the guide rail. The rod 65 projects radially along its length below the shoe 29 throughout a minor portion of its periphery. Thus the carriage arm 29 is normally supported by the guide rail by way of the rod 65. The rod 55 is provided with a flat 66 throughout its length,

but the rod is normally turned into a position wherein the flat 66 is out of contact with the guide rail. When the rod is, however, turned to bring the flat into contact with the guide rail the carriage .arm 29 is lowered slighly to advance the tool towards the record. The rod 65 is manually controlled by means of a bracket 61 on the rod 65. When the bracket is in a forwardly extending position asshown in Figure 2, the flat 56 is o the guide rail and the finishing-cut controlling means is therefore in inoperative position; when the bracket is, however, moved into an upward inclined position as shown in dash-dot lines in Figure 2, the flat 66 is brought into contact with the guide rail to place the finishing-cut controlling means into operative position.

The above-described structure and mechanism are common to .record shaving machines hereto-l fore manufactured and used, and form a part of the present invention only in so far as they are related to or combined with other mechanism hereinafter described.

In preparing a record shaving machine fo-r a record resurfacing operation the carriage is moved into an appropriate position along the record-usually a position wherein the resurfacing too-l overlies the record-the tool is set into operative position relative to the record, and then the carriage is manually returned to start position. It is an object of my invention to facilitate: the performance of the above operations by the provision of a ngerpiece on the carriage which is adapted to facilitate the manual movement of the carriage and which is moreover movable relative to the carriage to effect a setting of the resurfacing tool, thereby permitting the operator to grasp a single member (the iingerpiece) on the machine and perform both the manual movement of the. carriage and the setting of the tool by manipulations of thatv member.

Reference being had to Figures 1, 2,v 3 'and' 5l there will be seen a ngerpiece 68 projecting for- Wardly from the carriage arm 29. kThis fingerpiece is carried by a relatively heavy member 69v (suitably a casting) disposed within the recess 30 in the carriage arm 29 and provided withy a pair of left and right rearwardlyfand downwardly extending legs 69 and 69 which are pivoted on a pair of left and right trunnions and 1I carried by the left and right walls of the carriage arm 29, the fingerpiece 68 having an arm 68', -extending through along vertical opening 12 in the forward part of the carriage arm 29, which is secured byf` the screws 13 to the member 69.` The member 69 is biased upwardly against the top ofthe carriage arm 29 to normally retain the fingerpiece 68 inf its most upward position, shown in Figure 2, this biasing being effected by a tension spring 14 -connected between the left leg 69' of the member 69' and a pin 15 on the carriage arm. Thus manipulation of the carriage may be conveniently effected by grasping the iingerpiece 68 to tilt the carriage upwardly and to then move the carriage into the position desired. When the carriage is next lowcred on the guide rail the fngerpiece 68 may be next moved downwardly to cause a setting of the resurfacing tool without disturbing the carriage in its position, as hereinafter described, 4after which the carriage may be returned by the fingerpiece 58 to start position. f In order that a downward movement of the fingerpiece 88 relative to the carriage may cause the resurfacing tool to be set, there is provided in the recess 39 a long angular arm pivoted by a screw 11 to a boss 18 in the forward part of the carriage arm tends rearwardly from its axis throughout the' length of the carriage arm 29,- is Ioifsetto the right as at 19, and terminates in afork 86 having an open slot 8l. `Provided on the `toolsetting lever 41 is a pin 82 which slidably engages the slot 8l. When the arm wardly the lever 41 is turned in a counter-clockwise direction to cause a setting of the tool. In: order that a 16 which isv 29. The arm 16 ex'-.

16 is swung down-l downward movement ofthe fingerpiece 68 may cause such downward swinging movement of the arm 16fthere is pivoted on the member 69 between the legs 69 and 69, as on a pin 83, a roller 84 which impinges upon a cam face 85 on the arm 16 as the member 69 is moved downwardly by the fingerpiece 58. lWhen the resurfacing tool has been set the 1ingerpiece"'58.

upon its release, will return to its upward posiwith the rear edge 86 tion as: by reason of its biasing; the arm 1.64 will, however, be retained in its downward, or operated,` position by reason of the tool-setting lever 41 being releasably held in its operated position, as heretofore described.

Due to a possible out-of-alignnient between the path of the carriagewhich path is determined by the guide rail and the longitudinalrod 2li-and the mandrel shaft I3, it is important that the carriage be in some one predetermined position in its path each time the resurfacing tool is set into operative position` in order to insure that a uniform depth of cut along the record willY be obtained for each record resurfacing. In

"' accordance with my invention I provide means for preventing a setting of the resurfacing tool except when the carriage is in such predetermined position, this position of the carriage being preferably at a point substantially midway of its path of movement asisindicated in Figure 5.

'I'he means for restricting the setting of the tool to a predetermined position of the carriage comprises a slide member 86 (see Figure 2) which is mounted for vertical movement within the recess 30 of the carriage arm 29 by a pair of cross pins 8-1.v carried by the carriage yand passing slidably through a long vertical slot 89 in the slide member, theslide member 86 being retained on the pins 81 at a point substantially midway of the width of the recess 30 by means of tubes or spacers 89 which embrace the pins. Integrally formed with the slide member 86 is a rearwardly extending arm 90 which terminatesl in an open slot 9| embracing a pin 92 carried by the angular arm substantially midway of its slide member 86 being thus coupled with the arm 16 so as to cause the slide member to be moved upwardly and downwardly with the upward and downward swinging of the arm. On the slide member there is pivoted, as at 93, an arm 94 which extends downwardly just to the rear of the guide rail |0 and which terminates in a foot 95. 'I'he arm 94 is biased forwardly into a position defined by the contact of an ear 94" on the arm with a face 96 on the rear of the carriage shoe 29 as by .a tension spring 91 connected between the slidemember 86 and the ear 94', rearward movement of the arm being limited by the contact of a lug 98, turned over from the arm 94,

of the slide member. Provided along the guide rail is a rearwardly eX- tending ledge 99. When-,the resurfacing tool is in a set position the foot 95 is below the ledge 99 as shown in Figure 2, the foot 95 being yet below the ledge even when the carriagenarm 29 is moved into its upwardly tilted position. However, when the resurfacing tool is released to inoperative position the slide member 86v is moved upwardly by the arm 16 to bring the foot 95 of the arm 29 into a position overlying the ledge, the foot sliding over the ledge and then snapping forwardly by reason of its biasing. When the foot 95 is above the ledge 99 the slide member 86 is locked against downward movement, thereby preventing a setting of the tool. The ledge 99 is, however, provided with an opening |00 which is` positioned so that when the carriage position abovementioned, overlies the opening |00.

the foot 95 directly This opening is large enough to permit the foot 95 to pass freely therethrough so as not to obstruct the-slide member 86 against downward movement, thereby permitting a setting of the resurfacing tool when the carriage is in its predetermined position.

In order that the carriage may be readily length, the

is in its predetermined aeoasae located in this predetermined position wherein a setting of the tool is permitted, I provide means for stopping the return movement of the carriage to this position. This stopping means comprises a stop rmember 0|- (see Figure 8) slidably mounted on the top side' of the base plate to the rear of thecarriage by means of a shoulder screw |02 which passes through a slot |03 in the stop member. The stop member has a forwardly extending arm |04 provided with a turned-up lug |04 which lies directly behind the ridge 38 on the baseplate. The stop member |0| is biased leftwardly and in a counter-clockwise direction about the screw |02 by means of a tension spring |05 connected-between the stop member and a pin |05 onthe base plate, the leftward position of the stop member being defined by the contact of the screw |02 with the end of the slot |03 and the counter-clockwise turning of the stop member being limited by the contact of an upright pin |06 on the base plate with an arm |01 on the stop member. As the carriage is manually moved along the record the post 31 onv the carriagewhich post. has its lower end portion milled to form left and right flat faces 31 and 31" thereon-slides along the ridge 38 to define the upward tilted position of the carriage. When the carriage is returned from its terminal position the face 31" of the post 31 impinges against the lug |04 and moves the stop member |0| rightwardly against its biasing until the stop member is limited byA the screw |02. The return of the carriage is. then stopped, the stop member ||l| being so positioned as to cause this stopping of the carriage to occurA in the predetermined position above mentioned. When the carriage arm 29:'is lowered on the guide rail the face 3l of the post 31 is moved free of the lug |04; the sto-p member |0| then moves leftwardly, as because of` its biasing', ton bring the lug |04 into a position to the left of thev post 31. The carriage arm 29 may then be again tilted upwardly and its return movement resumed. If the carriage shouldv be manually moved to the left the leftwa-rd face 31 of the post 31 will impinge against the lug |04 to turn the stop member |0| in a clockwise direction. As.. the stop member |0| is so turned the lug |04 snaps over the post 31, thereby freeing the carriage of the stop member to permit further leftward movement of the carriage.V

The resurfacing tool may be properly set only when the mandrel is stationary and properly supported-the conditions present when the machine is out of operation and the endgate is closedand when the finishing-cut controlling means is in inoperative position. In accordance with my invention, a proper setting of the tool is insured by the'provision of means for preventing a toolsetting whenever either the machine is in operation or the endgate is open, and by the provision of means for resiliently maintaining the finishing-cut controlling means in inoperative position so long as the tool is released, thereby in practice normally insuringa setting of the tool only when the finishing-cut controlling means is in operative position. This means for preventing an improper setting of the tool may very suitably be in the form of a controllable gate for closing the opening |00 in the ledgey 99 since in View of the mechanism heretofore described a tool-setting is possible only by reason of the opening |00.

Reference being had to Figures 5, 6, 7, and 8, it will be seen that, the guide rail. |0 is cut away below ,the .opening |00.

to. form a` recess |08 inwhich there is disposedra vertical arm |09 having at its uppei` end a turned-back lug forming a gate ||0 for the opening |00. The arm |09 is provided with turned-over ears I I I, atits lower end, which are pivoted by a cross pin ||2 to a bracket |I3 secured to the base plate. When the arm |09 is tilted backwardly the gate ||0 closes the opening to thereby prevent a setting of the tool, but when the arm |09 is tilted forwardly the gate I I0 is free of the opening |00 to then permit a tool setting.

In order that a tool setting will be prevented when the machine is in operation, the arm |09 is coupled to the switch 51 so that the opening |00 will be closed by the gate I I0 when the switch 51 is 'in on position. This coupling means comprises a slide member II4 (see Figures 8 and 9) disposed below the guide rail I0 at the underside of the base plate and mounted for lateral movement, the member ||4 being slidably retained to a pair of bosses ||5, extending downwardly from the base plate, by a pair of shoulder screws IIB. The slide member |I4 partially overlies the arm 62 of the switch-control means and is coupled to this arm by means of a vertical pin I I1 on the arm which passes through a cross slot ||8 in the slide member, the slide member being thus moved rightwardly and leftwardly as the control lever 59 is moved leftwardly and rightwardly to place the switch 51 into on and off positions. Turned up fromthe slide member I |4 is a lug ||9 which extends through an opening IIS in the base plate. Extending along the right half portion of the guide rail I0 is a bar 20 which is pivoted at a point substantially midway of its length, as by a pin |2I, to the lug I I9. At the left end of thebar |20 there is provided an angular longitudinal slot |22 which is curved upwardly in proceeding rightwardly along the slot, as shown in Figure 9, and which is engaged by a short arm |23 extending rearwardly from one of the ears I of the arm |09, as shown in Figure'?. While the bar |20 is pivotally supported its pivoted movement is limited or guided by a pin- |24 on the guide rail which passes through a longitudinal slot A|25 provided in the right end portion of the bar. Y

When the switch 51 is in off position, the control lever 59 being then in `the position shown in Figure 8, the bar v|20 is in its most leftward position with the pin |23 engaging the upward right end portion |22 of the curved slot |22. The arm |09 is then held in a forwardly tilted position to render the gate I I0 free of the opening |00, thereby permitting a setting of the resurfacing tool. When the controllever 59 .is

moved leftwardly to place the switch 51 in on position, the bar is moved rightwardly with the pin |23 coming to rest in the lower left end portion |22 of the curved slot |22. The arm |09 is then heldin a rearwardly tilted position wherein the gate I IIJ closes the opening |00, thereby lock-Q ing the tool-setting means to prevent a setting of the tool.

In order that the arm |09 may also be tilted rearwardly to close the opening' |00 by the gate IIB when the machine isstopped and the endgate is open, the right end portion |20 of the bar is extended rightwardly beyond the guide vrail at a level just below the endgate (see Figure 9). 'Ihe bar |20 is also biased in a counterclockwise direction by a tension spring |26 connected between the bar and the slide member |I4, and at the 'right end portion of the slot |25 .there is provided a downwardly extending notchr |21 to permit a limited counter-clockwise movement of Vthe bar |20 whenthe bar is in its leftward position, .the position of the bar when the switch 51 is in off position. When the-endgate is closed the `b ar `|20 is held in its normal position by the contact of the right end portion |20 of the bar with the endgate. The armv |09 -of the gate ||0 is then tilted forwardly to render In order .that the release of the resurfacing` tool from operative position may cause the finishing-cut controlling means to be restored to inoperative position the foot 9 5 of the arm 94 ls provided with a cross pin |28 andthe finishingcut controlling means is, provided with a rearwardly extending pinv |29.,- -As the bracket 61 of the nishing-cut controlling means is moved upwardly into Ioperative position the pin v|29 is swung downwardly.` Upon the release of the tool from a set position the slide member 86, which carries the arm 94, is ,moved upwardlyas heretofore described. In the terminal movement of the slide member the 'pin'l28 impinges upon the pin |29 to move the bracket 61 downwardly, thereby placing the finishing-cut controlling means in inoperative position. Since theslide member 86 is biased upwardly when the tool is released, as by the Spring 45 which urges the tool into its released .or inoperative. position, the finishing-cutv controllingy means'lis yieldably held in inoperative position solong `as the tool is not set, thereby in practice insuring against accidental setting of the tool while the finishing-cut controlling means ifs in operative position.A

The means for releasing the resurfacing tool from operativeA position is operated by throwing the switch 51 to off position to stop the machine, and comprises a.bar.|3,0 disposed `behind and along the guide rail throughout the length of thepath of movement'of the carriage, the bar being slidably mounted on left and right bosses |3| Vand |32 on the guide Vrail by the shoulder screws |3I and |32 which pass through respectiveslots |3|'l and |32 in the bar to thread vinto the respective bosses. The slots |3I" and r|32 are parallel toeach other and are at a substantially 45 angle from a vertical line so that the bar will have bo-th vertical and lateral components of movement. When the bar is in its most downward position, this Vbeing also its most rightward'position, as shown in Figure 5, the bar is slightly below the position occupied by the foot when the resurfacing tool is set, asis indicated in Figure 2. The bar |30 is normally held in this most downward and rightward position by means of a tension spring |33connected between the bar and a pin |33` on the guide rail. At the right end portion of the bar |30 there is provi-ded a downwardly extending ear |34 (See Figure 4:)- on which is pivoted, by a screw |35, a shortV-shaped pawl |36. The pawl |36 extends downwardly through the opening I 9 in the base plate and isfbiased by a spring |31 in a clockwise direction into fa position defined by the abutment of a top lug |38 on the pawl with the ear |34.. On thearm 62 of the operating means for the switch 51 there is provided a turned-up lug |39. When the switch 51 is in on position andthe bar |30 is in its downward or unoperated position the lug |39 is slightly to the right of the pawl |36, as shown in Figure 5. When the switch 51 is thrown to off position the arm 62 is moved to the left and the lug |39 is impinged against the pawl |36 to cause the bar |30 to be moved leftwardly and upwardly. The upward component of movement of the bar causes, as by the contact of the bar with the foot 95, an upward movement of the slide member 86 and of the arm 16, thereby imparting a clockwise or tripping movement to the tool-setting lever 41 to cause both the release of the tool and the biasing of the finishing-cut controlling means to inoperative position as heretofore described. The bar |30 is moved sufficiently upwardly to render the pawl |36 free of the lug |39 before the lug reaches the end of its travel in the throwing of the switch 51 to off position. When the pawl |36 becomes free of the lug |39 the bar |30 is returned by the spring |33 into its downward or unoperated position. When the4 switch 51 is later thrown to on position, no movement is imparted to the bar since the lug |39, in its rightward movement, merely encounters an inclined cam face |36 on the pawl |36 and turns the paWl out of its path of movement, the pawl then snapping back into its normal position as because of the spring |31.

The above-described tool-releasing means is not effective when the carriage arm 29 is in an upwardly tilted position since the foot 95 is then out of the path of the bar |30. Thus when the carriage is held in an upwardly tilted position the machine may be stopped Without releasing the tool. 'I'he tilting of the carriage for the purpose of avoiding the release of the tool by the stopping of the machine will, in practice, `be done when, at the completion of a first cut on the record, the machine is stopped for the purpose of inspecting the surface of the record to determine if a finishing cutis necessary. If a finishing cut is found desirable the .carriage will be returned'to start position in the usual manner and the machine will be restarted .to take the 'finishing cut. If, however, it is not found .desirable to take a iinishing cut the .carriage will be lowered on the guide rail at its terminal posivtion and the record will be ejected from Ythe machine. In vorder that such lowering of the carriage may cause the release of the tool from its set position, so as in practice to insure that the tool will be released when the carriage is later returned for the purpose of resetting the tool, there is provided at the left end vportion of the guide rail a rearwardly extending ledge |40 which is positioned below the rledge 99, as shown in'Figures l and 2. When the carriage arm 29 is moved into its upwardly tilted position, while the kcarriage is in its terminal position and the tool is in `a set position, the foot 95 is caused to snap over the ledge |40. If the carriage is next returned the foot 95 is moved off of the ledge |40, but if the carriage arm 29 is next lowered on the guide rail while the carriage is yet in its terminal position the foot 95 is moved upwardly relative to the carriage,v by reason of its contact with the ledge |40, to cause the release of the tool.

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

I claim:

1. In a phonograph record resurfacing machine having a record support: the combination of a carriage movable along said support; a resurfacing tool on said Acarriage settable into operative position relative to a record on said support; tool-setting means; and means, associated with said tool-setting means, for rendering said tool-setting means inoperable except when said carriage is in a predetermined position in its path.

2. In a phonograph' record resurfacing machine having a record support: the combination of a carriage movable along said support; a resurfacing tool on said carriage settable into operative position relative to a record on said support; tool-setting means; and means, extending along a portion of the path of said carriage and operatively associated with said tool-setting means, for rendering saidtool-setting means inoperable for all positions of said carriage within said portion of its path.

3. In a phonograph record resurfacing machine having a record support: the combination of a carriage movable along said support; a resurfacing tool on said carriage settable into operative position relative to a record on said support; tool-setting means on said carriage; and restricting means for said tool-setting means comprising an obstructing member extending along a portion of the path of said carriage and means operatively connecting said tool-setting means with said obstructing member whereby said tool-setting means is rendered inoperable while said carriage is within said portion of its path.

4. In a phonograph record resurfacing machine having a record support: the combination'of a carriage adapted to ybe driven and otherwise manipulated along said support; a resurfacing tool on said carriage settable into operative position relative to a record on said support; toolsetting means mounted on said carriage; a fingerpiece extending forwardly from said carriage and adapted to be grasped to manipulate the carriage, said fingerpiece being mounted for movement relative to said carriage in a direction transversely of the direction of movement of said carriage; and means, operatively connecting said tool-setting means with said ngerpiece, for causing said tool-setting means to be `operated by the movement of said ngerpiece relative to said carriage.

5. In a phonograph record resurfacing machine having a record support: the combination of a slidably mounted and upwardly tiltable carriage adapted to be slidingly manipulated along said support when retained in an upwardly tilted position; a resurfacing tool 4on said carriage settable into an roperative position relative to a record on said support; a ngerpiece on said carriage adapted to be grasped to tilt the carriage upwardly and to manipulate the same across said support; and means, connecting said fingerpiece with said resurfacing tool, for causing a setting of the tool by a downward movement of said fmgerpiecerelative to said carriage.

6. In a phonograph record resurfacing machine having a record-supporting mandrel; the combination of an endgate movable into and out of a mandrel-supporting position; a resurfacing tool settableinto operative position relative to a record on said mandrel; tool-setting means; and means, operatively connected with said endgate, for rendering said tool-.setting means ineffective while ilk) said endgate is out of its Amandrel-.supporting position.

'7. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an endgate movable into 4and out of a mandrel-supporting position; a resurfacing tool settable into operativeposition relative to a record on said mandrel; tool-setting-means; and means, controlled-by said endgate, for locking said tool-setting means against operation.

8. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of a movable endgate for said mandrel; a carriage movable along said mandrel; a resurfacing toolon said carriage settable into operative position relative to a record on said mandrel; tool-setting means; means 'for rendering said tool-setting means inoperablefor all selected positions of said carriage Within a portion of its path of movement; and means, controlled by said endgate, for controlling said tool-setting means when said carriage is out of'saidportion of its path. 9. In a` phonograph record resurfacing machine having a record-supporting mandrel'z'the combination of a movable endgatetforsaidrmandrel; al control means movable linto. on and off positions to start and stop theoperation of the machine; a resurfacing tool settableinto'- operative position relative to a record on said mandrel; tool-setting means; and means, jointly controlled by said endgate and said control means, for rendering said tool-setting means ineffective to set said tool.

10. In a phonograph record resurfacing machine having a record support: the combination of a control means movable into on and o positions-to start and stop the operation, of the machine; a resurfacing tool settable into operative position relative to a record on said support; means for setting said tool; and means, operated incidental to the movement of said control means to on position, for rendering said tool-setting means inoperable.

11. In a phonograph record resurfacing machine having a record support: the combination of a control means movable into on and off positions to start and stop the operation of the machine; a resurfacing tool settable into operative position relative to a record on said support; tool-setting means; and means for preventing setting of said tool during the operation of the machine comprising locking means for said toolsetting means and means,'operatively connecting said locking means with said control means, for rendering said locking means operative when said control means is in on position.

12. In a phonograph record resurfacing machine having a record support: the combination of a control means movable into on and o positions to start and stop the operation of the machine; a carriage movable along said support; a resurfacing tool on said carriagev settable into operative position relative to a record on said support; tool-setting means; means for rendering said tool-setting means inoperable While said carriage is out of a predetermined portion of its path of movement; and means, rendered operative incidental to the movement of said control means to on position, for rendering said toolsetting means inoperable When said carriage is Within said predetermined portion of its path.

13. In a phonograph record resurfacing machine having a record support: the combination of a control means movable into on and off positions rto, startL and-stop the operation of the machine; a .resurfacing tool. movable into operative and yinoperative'positions relative to a record on said-support; means formoving said tool to operative position; and means, `operated by said control means, for causing said tool to be moved to inoperativeposition by the kmovement of said control'meansto off position and for rendering said tool-moving means inoperable When said control means is in on position.

`rll. In a"'phonograph record resurfacing machine havinga record support: the combination of a resurfacing tool settable into operative position relative to'a-rec'ord on said support and releasabletherefrom; finishing-cut controlling means imovable into operative position to advance -saidV tool a predetermined distance towards vthe record; and means, operatively connecting'said tool with said finishing-cut controlling-means; for moving" thefinishing-cut controlling means lout of operative position upon the relea'se of .salid'tooL r 15; -In--aphonograph record 'resurfacing machi-nehaving -a' recordsupport: the combination of-aresurfacing` tool settable into operative position relative to a record on said supportand releasable i therefrom; finishing-cut controlling means movable-into'operative position to advance said -.toola .predetermined distance to- Wards the recordf'and means, rendered effective upon-:the-'srelease ofisa-id to'ol, for biasing said finishing-cut controlling means out. of operative position.

16. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool having operative andy inoperative positions relative to a record on said support; means for releasably locking said tool in operative position; finishing-cut controlling means movable from inoperative to operative position to advance said tool towards the record; and biasing means, rendered effective as an incident to the release of said tool-locking means, for moving both saidtool and said finishing-cut controlling means to their respective inoperative positions.

17. Ina phonograph record resurfacing machine having a support for a record to be resurfaced: the combination of an on and off control means for the machine; a resurfacing tool settable into operative relationship to the record and releasable therefrom; a finishing-cut controlling means movable from inoperative to operative position to advance said tool towards l the record; and means,.operated incidental to the movement of said control means to off position, for releasing said tool and concurrently causing said'iinishing-cut controlling means to be moved into inoperative position.

18. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool settable into operative relationship to a record on said support; a finishing-cut controlling means movable from inoperative to operative position to advance said tool towards the record; and means, controlled by said tool, for moving said finishing-cut controlling means to inoperative position.v

19. In a phonograph record resurfacing machine having a record support; the combination portion of its path, for setting said tool into operative position relative to a record on said support; and means for locating said carriage to permit the setting of the tool comprising a stop for interrupting the manual movement of said carriage when the carriage is moved into said predetermined portion of its path.

20. In a phonograph record resurfacing machine having a record support: the combination of a carriage movable along, and tiltable away from and towards, said support; a resurfacing tool on said carriage settable into operative relationship to a record on said support and releasable therefrom; and means for causing a release of said tool from a set position by a tilting move- 'ment of said carriage towards the record.

21. In a phonograph record resurfacing machine having a record support: the combination of :a carriage movable along, and tiltable in directions normal to, said support; a resurfacing tool on-saidcarriage settable into operative relationship to a record on said support and releasable therefrom; and means, operated by said carriage, for causing a release of said tool from a vSet position as an incident of a to and fro movement of said carriage away from and towards said record support.

l 22. In a phonograph record resurfacing machine having a frame and a record support rotatably mounted on said frame; the combination of -a carriage mounted on said frame to slidealong 'said record support and to tilt upwardly and downwardly relative to said support; a resurfaclng tool on said carriage settable into operative relationship to a record on said support and re- -leasable therefrom; tool-releasing means, and means mounted on said frame and coacting with said tool-releasing means to cause operation thereof as an incident to a downward tilting of said carriage.

23. In a phonograph record resurfacing machine having a record support: the combination of a carriage movable along, and tiltable upwardly and downwardly relative to, said support; a resurfacing tool on said carriage settable into operative relationship to the record and releasable therefrom; and means, operated by said carriage and rendered effective as an incident to an upward tilting of the same, to cause the release of said tool from set position upon a downward tilting of the carriage.

24. In a phonograph record resurfacing machine having .a record support: the combination of a tiltably mounted `carriage movable along said support; a resurfacing tool on said carriage settable` into operative relationship to the record and releasable therefrom; and means, eifective when said carriage is in a predetermined portion of its path along said support, for causing the release of said tool from a set position by a tilting of said carriage.,

LOUIS Z. LA FOREST.

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