US2231430A - Phonograph record resurfacing machine - Google Patents

Description

Feb. 11, 1941. R. M. soMERs PHONOGRAPH RECORD RESURFACING MACHINE Filed June 24, 1939 SSheete-Sheet 1 7 INVENTOR Rlclza rd M Somers A ORNEY Feb. 11, 1941. R. M. soMERs' PHONOGRAPH RECORD RESURFACING MACHINE Filed June 24, 1939 3 Sheets-Sheet 2 I I I I I I I I I I l I I I I I I I A RNEY INVENTOR Richard 1'[ J0me Feb. 11, 19451. R. M. SOMERS PHONOGRAPH RECORD RESURFACING MACHINE Filed June 24, 1939 3 Sheets-Sheet 3 ahdwk Jizclzard M Some? .36 BY RNEY Patented Feb. 11, 1941 warren STATES PATENT QFHQEE PHONOGRAPH RECORD RESURFACING MACHINE Application June 24, 1939, Serial No. 280,902

26 Claims.

This invention relates to machines for resurf a-cing phonograph records, and more particularly to the provision of new and improved means in record resurfacing machines for facilitating their operation. In some respects this invention has certain features in common with those disclosed and claimed in my copending application Serial No. 232,766, filed October 1, 1938, and entitled Phonogr-aph record shaving machines (which application issued July 30, 1940, into Patent No. 2,209,833). Although the invention has particular utility, and is shown and described in connection with machines for resurfacing records such as are employed with dictating machines, no unnecessary limitation to any particular kind of phonograph record resurfacing machine is intended.

Phonograph record resurfacing machines of the form above mentioned comprise a record-supporting mandrel, an endgate for the mandrel, a carriage bearing a resurfacing tool settable into operative position relative to a record on the mandrel, and driving means operable to rotate the mandrel and coincidentally move or feed the 3 carriage along the mandrel from a start to a terminal position to cause the tool to take a cut from the record. When, at the completion of one cut on the record, another cut is to be taken, as on the same or on a newly mounted record, the tool is first released from its previously set position and is next set on the record, after which the carriage is manually returned to start position and the driving means is restarted.

It is an object of my invention to facilitate 3 the operation of a record resurfacing machine by the provision of new and improved means for controlling the setting and the release of the resurfacing tool.

It is another object of my invention to automatically release the resurfacing tool from its previously set position as an incident to the resetting of the tool.

Another object of my invention is to cause the release of the tool from a previously set position and the subsequent resetting of the tool by a single manipulation of a manually operable means on the machine.

It is a feature of my invention to provide a tool-setting lever normally retained in a resiliently biased position and movable into a manually constrained position to cause the tool to be first unlocked from its previously set position, to be later moved into operative position relative to the record, and to be thereafter relocked in such operative position, in the sequence here named.

It is another object of my invention to provide a tool-setting gauge which is retracted from the record upon the release of the abovementioned 5 tool-setting lever.

It is another object of my invention to set the tool into operative position by means of manually controlled power-operated means.

It is another object of my invention to cause the tool to be set into operative position relative to a record on the machine as an incident to the mounting of the record on the machine.

Another object of my invention is to cause first the rel-ease and subsequently the resetting of the tool as an incident to the mounting of a record on the machine. A feature of my invention is to cause the tool-setting means to be operated as an incident to the latching of the endgate in its mandrel-supporting or closed position.

Another object of my invention is to provide new and improved foot-operated means for controlling the operation of the machine.

Other and allied objects will more fully appear from the following description and the appended claims.

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

Figure 1 is a top plan view of a phonograph record resurfacing machine incorporating my invention;

Figure 2 is a right-hand elevational View, partly broken away and partly in section, of the mechanism of Figure 1; v

Figure 3 is a fractional sectional view taken substantially along the line 33 of Figure 1;

Figure 4 is a sectional View, taken substantially along the line 4-4 of Figure 2, showing details of the tool-setting means;

Figure 5 is a view of the tool-setting means as taken from the line 5-5 of Figure 2, a portion of the tool-setting means being broken away for the better illustration of its interior parts;

Figure 6 is a fractional elevational View, taken from the rear of the machine and principally showing details of a power-operated means for setting the tool; 7

Figure '7 is a right-hand view, partly in section, of the mechanism of Figure 6;

Figure 8 is a view, partly in section along the line 38 of Figure 7, showing details of the interconnecting means between the power-operated means abovementioned and the tool-setting means; and

Figure 9 is a diagrammatic view of mechanism and circuits in accordance with my invention.

Reference being had to the figures, particularly Figures 1 and 2, 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 lower cabinet portion I carrying at the top thereof a base plate 2 on which the various parts of the machine are mounted. The base plate is provided with a left-hand upright standard 3, an intermediate upright standard 4, right-hand upright standards and 6, and an upright boss spaced to the right of the standard 6. Pivoted on the boss I is an endgate 8 biased into open position by a torsional spring 9 but normally held in closed positionthe position the endgate occupies in Figure 1-by an endgate bolt or latch I 0. This latch is pivoted as at II to the right end portion I2 of a guide rail I2 which extends laterally along the front of the machine. The endgate 8 carries a bear-' ing or stud I3 which together with another such stud I4, carried by the standard 3, form right and left thrust bearings for a laterally extending shaft I5. The shaft I5 passes through an oversized hole It in the intermediate standard 4, and carries a mandrel IT for removably supporting a cylindrical record I8 to be resurfaced. To mount or remove a record on or from the mandrel I1, the endgate 8 is first opened to free the right end of the mandrel; during the time the endgate is open the shaft I5 is intermediately supported by the standard 4 but is retained in engagement with the stud I4 by the abutment of a collar I9 on the shaft against the left side of the standard 4.

To remove a record from the mandrel I! there is employed a record ejector, well-known in the art, which comprises a handle 29 integrally formed with a hub 2! and an upstanding arm 22 which pivotally carries a shoe 24. the hub 2I being pivoted on a rod 23 supported at one end by the guide rail I2 and at the other end by the intermediate standard 4. The ejector is resiliently biased into inoperative position, defined by the contact of the handle 28 with the base plate 2, by means of a torsional spring 25 restrained at one end by the base plate and at the other end by the handle. To operate the ejector the handle 29 is raised against the force of the spring 25, so as to move the shoe 24 rightwardly against the record, thereby pushing the record off of the mandrel.

Parallel to the shaft I5 and guide rail I2 is a rod 26 supported by the left and right standards 3 and 5. Slidably and tiltably mounted on the rod 26 is a carriage 21 having a sleeve 28 embracing the rod. The carriage is provided with a heavy arm 29 curved forwardly over the mandrel I! and terminating in a shoe 29' which normally rests on the guide rail I2. Movement of the carriage in'a leftward direction across the mandrel (as from a start position at the right end of the mandrel to a terminal position at the left end of the mandrel) is effected by a laterally extending feed screw 30 rotatably supported by the left and right standards 3 and 5, the connection between the carriage and feed screw being made by a resilient and rearwardly extending arm 32 secured to the sleeve 28 and carrying a feed nut 33 which, when the carriage arm 29 is resting on the guide rail, is urged into engagement with the underside of the feed screw. So long as this engagement between the feed nut 33 and feed screw 38 is maintained, rotation of the feed screw in normal operating direction will cause a slow steady feeding movement of the carriage in a leftward direction. In order that such feeding of the carriage will occur coincidentally with the rotation of the mandrel Il, the feed screw is rotatably coupled to the mandrel shaft I5 by means of a belt (not shown) which embraces a pulley 34 on the feed screw and. a pulley 35 on the mandrel shaft.

To disconnect the carriage from the feed screw 30 to permit the carriage to be manually moved along the mandrel the carriage arm 29 is raised so as to move the feed nut 33 downwardly out of engagement with the feed screw, the raising of the carriage arm being limited by the contact of a post 36 on the carriage with a ridge 3? provided on the base plate. In the operation of the machine a manual movement of the carriage is relied upon to return the carriage from its terminal to its start position.

On the right side of the carriage at a point substantially overlying the rod 26 is an extension 38 which is square-shaped as viewed from the end. The extension 38 carries a resurfacing tool comprising a knife blade 39 mounted on a knife bar 40 which passes slidably through an opening 4| (see Figure 6) in the extension 3%! for movement towards and away from the record. When the tool is set into operative position-a position of the tool in which the knife blade 39 engages the record-a feeding of the carriage along a rotating record will cause a surface layer of the record to be cut away by the too], this cutaway layer being carried by a chip chute 42 downwardly through an opening 43 in the base plate.

The driving means for the machinethe means for feeding the carriage and rotating the mandrel-may comprise a suitable electrical motor M, schematically shown in Figure 9, which may be located beneath the base plate I and may be coupled to a pulley 44 on the mandrel shaft I5 by a belt (not shown) which may pass through an opening 45 in the base plate. The motor M is provided with a power supply circuit 46 which is adapted to make connection with a suitable source of power by way of a plug 4! and which serially includes an on and off switch 48 preferably of the toggle variety. The switch 48 is mounted on the underside of the base plate in the front right-hand portion thereof, and is controlled by means of a control lever 49 having a shaft 50 which passes downwardly through the base plate. Secured to the lower end of the shaft 50, as by a shoulder screw 5|, is a rearwardly extending arm 52 carrying a slotted, pivoted stud 53 through which slidably passes an actuating arm 54 of the switch 48. Thus when the control lever 49 is rocked leftwardly and rightwardly the arm 54 is moved rightwardly and leftwardly, thereby placing the switch 48 in its respective closed and open, or on and off, positions, the lever 49 snapping into its respective positions by reason of the toggle nature of the switch.

At the completion of a first or heavy out there may if desired be taken from the same record another cut of a light or finishing character. To advancev the tool for a finishing cut, the tool is left in its previously set position but the carriage is advanced slightly towards the rec ord by a finishing-cut controlling means comprising a short rod 55 pivoted for movement about its longitudinal axis in the shoe 29 of the carriage. The rod 55 is in parallel relation to the guide rail l2 and projects radially along its length below the'shoe 29" throughout a minor portion of its periphery so that the carriage arm 29 is normally supported by the guide rail by way of the rod 55. The rod 55 is provided, however, with a flat 5% throughout its length which, upon turning the rod, is brought into contact with the guide rail, the carriage arm being then lowered slightly to advance the tool towards the record. Turning of the rod 55 is manually effected by means of a fingerpiece 51 extending forwardly from the rod. When the fingerpiece 51 is in the position shown in Figure 2, the flat 56 is off the guide rail and the finishing-cut controlling means is in inoperative position; but when the fingerpiece is moved upwardly the fiat 56 is brought into contact with the guide rail to advance the tool towards the record, thereby placing the finishing-cut controlling means in operative position.

Whenever a heavy cut is to be taken from a record-which heavy cut may be a repeat for the same record or the first cut for a record newly mounted on the machine-the tool is released from its previously set position to permit a resetting thereof, but when a finishing cut is to be made the tool is left in its previously set position and is advanced slightly towards the record by the finishing-cut controlling means. It is thus seen that while the release of the tool may be performed automatically in any of various ways so as to facilitate the use of the machine, this release of the tool must be carefully controlled so that it will not occur except when, in the next further use of the machine, a heavy cut is to be taken.

In accordance with my invention, I provide a particularly simple tool-releasing means which is controlled so as both to insure and to facilitate the proper use of the machine. This toolreleasing means is automatically operated as an incident of the resetting of the tool, the tool being first released and subsequently reset by the performance of but a single manipulation on the machine. The delay in the release of the tool from a previously set position until the time of resetting of the tool, is in practice made possible by the provision of a normally retracted tool-setting gauge permitting a setting of the tool while the tool is in a position beyond the end of the record, this being the position of the tool when the carriage is in its terminal position. While the means for releasing and subsequently resetting the tool may be manually operated, as above described, this means may also, as an additional feature of my invention, be powor operated, the power operation being so controlled as to cause a resetting of the tool as an incident to a usual act performed in preparing the machine for the resurfacing of a record. The means for manually releasing and setting the tool is now described.

As shown in Figure 6, the extension '38 has, in addition to the opening 4|, two other openings 58 and 59 passing therethrough in parallel relation to the opening ll, the opening 58 being positioned directly to the right of the opening 6! and the opening 59 being directly below the opening as. In the opening ii there slidably fits the knife bar 43 as aforementioned, which bar is restricted against turning by means of a key be secured to the extension 33, by a screw 6! (see Figure 4), and slidably engaging a slot t2 provided in the knife bar li) longitudinally thereof; in the opening '58 there slidably 'fits a gauge bar 63 having an upper reduced-diameter portion '63 passing through the top wall of a cap 64 which is mounted for movement in the direction of that of the gauge bar 63 and knife bar 40; and in the opening 59 there slidably fits a rod 66 which is secured by a screw 65 to the cap 6G to serve as a guide for the cap.

Whenthecap 64 is moved downwardly towards the record the gauge bar 63 is yieldably moved therewith by reason of a compression spring fil' coiled about the reduced-diameter portion 63' of the gauge bar between the top of the cap and a nut '68 on the gauge bar; and when the cap .is m-ove'dupwardly the top wall thereof contacts a head 69 on the gauge bar to cause the bar to be moved with the cap. The cap M is biased upwardly by a relatively strong compression spring in coiled about the guide rod 66 between the extension 38 and the top of the cap. By reason of this biasing of the cap the gauge bar 63 is normally retained in an unoperated position defined by the contact of a stop pin H on the gauge bar with the underside of the extension 38.

The gauge bar 63 is coupled to the knife bar dfi by means of a tie bar 72 (see Figure 5). This tie bar is adjustably secured at one end to the gauge bar between the nut 63 aforementioned and another nut 68 on the bar, and is apertured at its other end to slidabiy fit the upper end portion 40' of the knife bar, which portion 26' is reduced in diameter to form a shoulder 38 on the knife bar. The knife bar til is yielda bly held in fixed spaced relationship with the gauge bar by means of a relatively light compression spring 13 which urges the tie bar i2 into contact with the shoulder it", the spring l3- being coiled about the portion Gil of the knife bar between the tie bar 72 and a headed screw 14 on the upper end of the knife bar. This fixed spaced relationship is controlled by the adjustment of the tie bar E2 on the gauge bar so that when the gauge bar is in contact with the record the resurfacing tool will be held in desired operative position relative to the record.

In the normal use of the machine, as in accordance with my invention, the resurfacing tool will be set into operative position when the carriage is in its terminal position, the tool then being to the left of the record. In the setting of the tool a predetermined downward movement is applied to the cap E i-a movement sumcient to cause the cap to impinge upon the extension 38-so as to urge the gauge bar into contact with the record. In so moving the cap the knife bar and gauge bar will at first be moved coordinately therewith and then after the gauge bar has contacted the record the cap is moved relative to the gauge and knife bars and the spring 61 is compressed, such relative movement of the cap to the knife bar being permitted by the provision of an opening 75 in the top of the cap through which the knife bar and the aforementioned screw M may freely pass.

For'applying a downward movement to the cap 64 there is provided a lever ll having a hub ll secured by a pin 18 to a head 78 of a shaft 89 which extends downwardly through the extension 38 at right angles to the knife bar it (see Figure 4). The shaft 80 is restricted against longitudinal movement in a downward direction by the contact of the head 19 with the extension 38 and against movement in an upward direction by the contact of a collar 8| secured to the lower end of the shaft by a set screw 82, with the underside of the extension 38. Provided on the collar 8! is an arm 88 which is connected by means of a link 84 to a boss 85 on the side of the cap 64, the link 84 being pivotally connected to the arm 83 by a shoulder screw 86 and to the boss 85 by a shoulder screw 81 which passes through a slot 88 extending longitudinally of the link 84. Connected between a short downwardly extending arm 89, secured to the cap 64 by a screw 89, and a pin 90 provided on the link 84 is a tension spring 9|. This spring is adapted to urge the link upwardly relative to the cap 64 so as to normally retain the screw 81 in the lower portion of the slot 88, as hereinafter explained.

When the tool-setting means is at rest, the cap 64 is yieldably retained in its upward position, defined by the contact of the stop pin H on the gauge bar 63 with the extension 38, and

the lever H is then yieldably retained in itsv unoperated position, shown in Figure 1, by the cap 64 and spring 9|. When the lever 11 is turned in a clockwise direction from its unoperated position the link 84 is first moved downwardly against the force of the spring 9|, until the screw 81 impinges against the upper end of the slot 88, and then the cap is moved downwardly into impingement against the extension 88. The impingement of the cap on the extension occurs when the lever 11 has been turned approximately 90 from its unoperated position, the link 84 then occupying the position shown in dash-dot lines in Figure 8. Thus it is seen that the cap 64 is not moved by the initial movement of the lever 11 from unoperated position; this is done for reasons hereinafter explained.

A'setting of the tool involves both moving the tool into operative position and thereafter locking the tool so that it will be releasably held there. With the above described mechanism it is seen that both the tool and gauge are biased away from the record but are each yieldably moved towards the record, the gauge being moved into contact with the record and the tool being moved into operative position determined by the gauge, as the lever 11 is moved through substantially 90 from its unoperated position. The locking of the tool into operative position may be made to occur as an incident to the completion of the movement of the gauge bar into contact with the record, and the tool may be retained in its locked position when the gauge is retracted from the record, as is disclosed in my aforementioned copending application Serial No. 232,766, filed October 1, 1938, and entitled Phonograph record shaving machines. It is, however, a feature of my present invention that the resurfacing tool shall not only be locked or set in operative position as an incident to the completion of the movement of the tool into such position, but that upon a reoperation of the tool-moving means the tool will be first released from its previously set or operative position and will immediately thereafter be relocked or reset in its new operative position. Thus the tool-locking means is normally operative, and is simply rendered inoperative temporarily during the resetting of the tool.

In accordance with the present invention the tool-locking means may comprise a pin 92 which is slidably mounted in the extension 38 for transverse movement with respect to the direction of movement of the knife bar 40 (see Figure 4). The inner end of the pin 92 slidably contacts a flat 93 on the knife bar, whereas the outer end of the pin projects slightly above the upper wall of the extension 38. Rotatably mounted on a reduced-diameter portion 19' of the head 19, between the hub 11 of the lever TI and the upper wall of the extension 38, is a disk 94 which overlies the pin 92. Projecting from the inner face of the disk 94 are four equi-angularly spaced cam pins 95 which, as the disk is progressively turned through 90 intervals, successively contact the pin 92 to press it tightly against the knife bar, thereby locking the tool for each position of the disk 94 wherein one of the cam pins 95 is in contact with the pin 92. The disk 94 is in the shape of a ratchet wheel, having in its periphery four equi-angularly spaced notches 96 (see Figure 5). Pivoted, as at 91, to the lever 11 is a pawl 98 which is biased by a torsional spring 99 into contact with the periphery of the disk 94'. By this pawl and ratchet arrangement, the disk 94 is turned in unison with the lever H, as through approximately 90, each time the lever is turned in a clockwise direction to move the gauge bar into contact with the record. The cam pins 95 are aligned relative to the notches 96 so that as the disk is moved through such 90 intervals one of the pins 95 will ride off of the pin 92 and the next following pin will ride onto the pin 92, thereby causing first an unlocking of the knife bar and then secondly a relocking of the knife bar. When the lever 11 is released to return to its unoperated position the disk 94 remains stationary, the disk being held by the friction between the pin 92 and the contacting cam pin 95. Thus the disk 94 is moved through a 90 interval for each reciprocation of the lever 11.

With the above described mechanism, it is seen that the initial movement of the lever 11 from its unoperated position causes one of the pins 95 to be moved free of the pin 92 to unlock the tool, thereby releasing the tool from its previously set position; that the next further movement of the lever 11 causes the gauge bar 63 to be moved into contact with the record, thereby determining the new operative position of the tool; and that the terminal movement of the lever Tl causes the next following one of the pins 95 to ride on the pin 92, thereby relocking the tool in its new operative position. When the lever 11 is next released both the lever TI and the gauge bar 63 are return-ed to their respective unoperated positions by the spring 10, the tie bar 12 moving up the knife bar to compress the spring 13 as the gauge bar is so returned. When the knife bar is unlocked, as by the initial movement of the lever H in the resetting of the tool, the tool is at first returned by the spring 13 to its unoperated position; a further progressive movement of the lever 11 then causes a resetting of the tool as above explained. It is in order to permit a full return of the tool to unoperated position before the resetting of the tool begins that the cap 64 is caused to be maintained stationary, as through the influence of the spring 9| as heretofore explained, during the initial movement of the lever Tl.

It is an additional feature of my invention to reset the tool by a power-operated means. This power-operated means may be rendered operative to reset the tool as an incident to the completion of the mounting of a record on the machinefor example, by the latching of the endgate in closed position. Reference being had to Figures 2, 6 and '7 there will be seen an iron-clad solenoid I65 mounted directly above the rearward part of the carriage arm 29, as on a bracket I86 secured by the screws I51 to the carriage.

I55 i provided with a plunger I68 which is connected by a rod I59 to a lever I10'pivoted as at I'll to a slotted boss I12 extending rearwardly 5 of the bracket I55, the rod I69 passing slida-bly through the bracket I66 and terminating in a slotted endpiece I59 carrying a cross pin I13 Which engagesa transverse slot I14 provided in the lever. Coupled to a downwardly extending 10 arm I15 of the lever I10 is a bar I05 slidably supported by a grooved extension I06, projecting rearwardly of the bracket 95, for movement in a direction parallel to that of the knife bar. The bar m5 is retained to the extension I96 by an 15 L-shaped plate I01 secured to the extension by the screws I51 and is coupled to the arm I15 by means of a cross pin I08 on the bar engaging a slot H5 provided in the arm I15. At. the lower end portion of the bar I55 there is provided a 20 rack H which engages with gear teeth II-I provided along a portion of the periphery of the collar 8 l. is energized the plunger I68 is propelled rearwardly, for example until it impinges against a 25 core portion I53 of the solenoid. As the plunger it is so propelled the lever I10 is turned in a counter-clockwise direction, as viewed from the right, and the bar N15 is thereby moved upwardly to cause the collar ill to be turned substantially 30 through a 90 angular range, thereby resetting the tool, the same as when the lever 11 is manually turned to reset the tool.

The solenoid N55 is so controlled that it is rendered operative, or energized, by the latching 35' of the endgate 8 in closed position-the act performed at the completion of a mounting of a record on the machine-, and is rendered inoperative, or deenergized, as an incident to the completion of its operation. When the endgate 0 is next unlatched, as in the removal of a record from the machine, the solenoid is reconditioned for operation so that upon the relatching of the endgate the solenoid will be reoperated to cause the resurfacing tool to be again reset. The 45 means by which the solenoid I55 is so controlled is now described.

The solenoid I 55 is provided with a power supply circuit I I3 serially including a manually operable on and oif switch H4, preferably of 50 the toggle variety, and an automatically controlled on and off switch II5, as shown in Figure 9. The switch I I4 may be suitably mounted on the base plate 2 in the forward left-hand portion thereof as is shown in Figure 1. This 55switch is provided for the purpose of enabling the operator to place the automatic tool-setting means into and out of operable condition, as desired, the automatic tool-setting feature being provided when the switch H4 is in on or closed 60 position and being removed when the switch is in oif or open position. The switch H5 is the main control switch for the solenoid I65, being placed in on or closed position by the latching of the endgate and in off or open position at 65 the completion of the setting of the tool. This switch comprises a pair of front and back laterally extending contact springs IIS and H1 insulated from each other and mounted in cantilever fashion on a stack IIB within a housing 70 I I9 which is secured to the underside of the base plate, in the rearward right-hand portion thereof, by a pair of screws I20, as is shown in Figures 1 and 2.

The springs H5 and Ill are each biased away 75, from each other and must eachbe moved from The solenoid In this arrangement, when the solenoid.

their biased positions towards the other in order to place the switch in on or closed position. The means for moving the back spring II1 towards the spring II'S, as into a forwardly constrained position, comprises a bracket I2I, of 5 suitable insulating material, which is secured to an angle iron I23. The angle iron I23 is pivoted,

as at I24, to the housing IE9 of the switch M5 for a limited pivotal movement. When. the angle iron I23 is in its most clockwise position, defined 10 by the contact of the angle iron with a stop pin 5:25 extending downwardly from the base plate (see Figure 1), a forwardly extending arm I2I of the bracket l2l contacts the back contact spring H1: to retain this contact spring in its forwardly constrained position abovementioned. As the angle iron I23 is, however, turned in a counter-clockwise direction the arm I2 I is moved rightwardly into alignment with. a notch I25 provided in the contact spring I I1,therebypermitting the spring i I1 to move rearwardly in response.

to its biasing. Movement of the angle iron I23ina counter-clockwise direction is eifected by an electromagnet. I21 and movement in a clockwise direction by the'unlatching of the endgate, as is 25 hereinafter explained.

The front spring H6 is moved towards the spring I H, or into a rearwardly constrained position, whenever the latch ill for the endgate 8 is placed in operative position, the spring H5 being permitted to move forwardly in response to its biasing whenever the latch i0. is moved to inoperative position, shown in dash-dot lines in Figure 1. The means for so controlling the spring H5 by the latch I0 comprises a slide bar I28 mounted on a flange I29, turned down from the right, side of the base plate 2, the bar I28 being retained to a pair of front and back bosses I35 and I3! on-the flange by a pair of shoulder screws I35 and I3I' which respectively pass through slots I30 and I3I" in the bar to thread into the respective bosses. The bar I28 has near its rearward end portion a leftwardly extending arm I32 into which there is threaded a headed screw I33 adapted to be retained in position by a lock nut I34. Directly behind the headed screw I33 is a stud I35 of suitable insulating material which is secured, as by riveting, to the front contact spring IIB. When the bar I 28 is moved rearwardly the headed screw I33 impinges against the stud I35 to thereby move the contact spring H6 rearwardly intoits constrained position.

The bar I28 is controlled by the latch ll As shown in Figure 3 the bolt or latch Ill is secured, as by a press fit, to the head I36 of a shaft I31 which extends downwardly through an opening I38 in the right end portion I2 of the guide rail, the contact of the head I36 with a shoulder I38 in the opening, I38 serving to hold the shaft I31 in place. aset screw I39, is a lever I40 carrying a vertical pin I4I which slidably engages a slot Hi2 provided in a lug I43 turned over from the bar I28, as shown in Figure 1. Thus, a movement of the latch III to operative position causes the bar I28 to be moved rearwardly and the contact spring I] 6 to be thereby moved into its constrained position, whereas a movement of the latch ID to inoperative position causes the reverse; action to take place: the bar I 28 being then moved forwardly and the contact spring I I6 being rendered free to move forwardly in response to its biasin away from the adjacent contact spring I I1.

In the terminal movement of the latch it] toinoperative position a lug I44, turned. over from an 7;.

Secured to the lower end of the shaft, by 60 arm I55 extending rearwardly from the bar I28, impinges against the angle iron I23 to turn the iron in a clockwise direction, thereby moving the back contact spring II'I forwardly into its constrained position. This, however, does not cause the switch I I5 to be placed in on position since, in the movement of the latch II) to inoperative position, the front spring III; is released from its rearwardly constrained position prior to the movement of the back spring III into its forwardly constrained position. But when the latch III is next returned to its operative position the front spring I I6 is moved rearwardly into contact with the back spring III (which isthen in its forwardly constrained position) to cause the switch I I5 to be closed or placed in on position. The closing of the switch II5 causes the solenoid I65 to be energized provided the manually controlled switch H5 is in on position. When the solenoid I55 is energized it effects a resetting of the resurfacing tool, as heretofore explained. In the terminal movement of the plunger I68, as at the completion of the resetting of the tool, an adjustable screw I55, carried by the lever III], is impinged against a push button I48 of a normally open contact switch I49 to cause the switch to be closed. The switch I49 is mounted on the bracket I66, as shown in Figure 7, and is connected in series with the aforementioned electromagnet I21, the serial connection of the switch I49 and electromagnet I2'I being in shunt with the solenoid I55, as shown in Figure 9. When the switch I49 is closed by the solenoid I55 the electromagnet I2? is energized, receiving its power by way of the power supply circuit II3 for the solenoid I65. The energization of the electromagnet I21 causes the angle iron I23 to be propelled in a counterclockwise direction, the rearward extending arm I23 of the angle iron serving as an armature for the electromagnet. When the angle iron I23 is so moved the back contact spring III of the switch H5 is released from its forwardly constrained position to open the switch I I5, as heretofore explained, thereby breaking the current to the solenoid I55. When this occurs the cap 64 is permitted to move upwardly in response to the spring III to cause the gauge 63 to be retracted from the record and the plunger I58 to be returned to unoperated position shown in Figure 7.

In considering the operation of the structure just described it is seen that in latching the endgate in closed positionthe last act performed in the mounting of a record on the machine-the solenoid is momentarily operated to cause a setting of the tool into operative position relative to the newly mounted record. At the completion of the tool setting the back contact spring III is released from its forwardly constrained position to thereby open the switch II5. When this occurs the cap 54 is moved upwardly by the spring III to retract the gauge bar"63 from the record and to return the plunger I68 of the solenoid I55 to unoperated position, the resurfacing tool remaining locked, in, its set position. When the endgate is next unlatchedas when a record is removed from the machinethe switch I I5 is prepared for a reoperation of the solenoid by the placement of the back contact spring II'I into its forwardly constrained position. The subsequent latching of the endgate in closed position, as at the completion of mounting a new record on the machine, will then cause the tool to be again automatically reset into operative position relative to the mounted record.

It is an additional feature of my invention to facilitate the use of a phonograph record resurfacing machine by the provision of a foot-operated means for controlling the machine. While this foot-operated means may be arranged to control various operations of the machine, I find it particularly desirable to employ such means for unlatching the endgate and concurrently stopping the machine. Reference being had to Figures l and 2 there will be seen a foot pedal I50 which may be suitably pivoted, as at I5I, to a lower portion of the cabinet I. Pivotally connected to the pedal I50, as at I52, is a vertical rod I53 which extends upwardly along the right side of the cabinet. The upper end of the rod I53 is pivotally connected, as at I54, to a forwardly extending arm I55 of an L-shaped lever I55 which is pivoted, as at I55, to a bracket I51 secured as by welding to the cabinet I. Connected between an upwardly extending arm I55" of the lever I55 and a bracket I58 secured as by welding to the cabinet I is a tension spring I59 which urges the lever I55 in a clockwise direction, into a position defined by the contact of the arm I55 with a stop pin I60, and which yieldably retains the foot pedal I55 in an upward or unoperated position.

When the foot pedal is pressed downwardly the lever I55 is turned, against its biasing, to cause the bar I28 to be moved forwardly by reason of the impingement of a cross pin IBI on the arm I55" with a shoulder I62 on the bar I28. Such forward movement of the bar I28 causes the lever I40 to be turned in a clockwise direction and the latch III to be thereby moved into inoperative position. In order that the pressing of the foot pedal I50 may also cause the switch 48 to be thrown to oif position the lever I40 is extended leftwardly from its axis and provided with a vertical pin I53 which, as the lever I40 is turned in a clockwise direction, impinges against a cam face I64 provided on the right side of the switch control arm 52, to move the switch arm leftwardly, thereby throwing the switch 48 to off position. When the foot pedal I50 is next released it is moved upwardly into unoperated position by the spring I59 but the latch I0 is left in inoperative position to be manually returned to operative position.

Although I have herein shown and described but a single embodiment 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:

I claim:

.1. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool; means for setting said tool into operative position relative to a record on said support; means for releasing the set tool from operative position; and unitary means progressively movable to cause said tool-releasing means and said tool-setting means to be operated in the sequence here named.

2. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool; means for setting said tool into operative position relative to a record on said support; means for releasing the set tool from operative position; manual means having a resiliently biased position and a constrained position; and means, operatively connecting said manual means with said tool-setting means and tool-releasing means, for causing said tool-releasits dire t ing means and tool-setting means to be operated in the sequence here named upon moving said manual means from its biased to constrained position.

3. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool; a member movable to set said tool into operative position relative to a record on said support; and means, operated as an incident to the initial portion of a tool-setting movement of said member, for releasing said tool from its previously set position.

4. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool movable into operative and inoperative positions relative to a record on said support and biased into inoperative position; means for moving said tool into operative position; means for releasably locking said tool in operative position; and means, operated incidental to the initial and terminal movements of said tool-moving means, for respectively releasing and relocking said tool-locking means.

5. In a phonograph record resurfacing machine having a support for a record to be resurfaced:

the combination of a resurfacing tool; reciprocative means o-peratively connected with said tool to cause the setting of said tool into operative relation with the record by the movemen reciprocative means in one of its mov tion-s; and means for releasing sa previously set position by th" merit of said recipr c w th having a record support: the combination of a resurfacing tool; a gauge associated with said tool and movable into contact with a record on said support to determine the operative position of said tool relative to the record; tool-locking 5 means; and means operable by a single manipu1ation thereof to render said tool-locking means inoperative, to move said gauge into contact with the record, and to render said tool-locking means operative, in the sequence named.

10. In a phonograph record resurfacing machine having a record support: the combination of a resurfacing tool; a gauge associated with said tool and movable into contact with a record on said support to determine the operative posi- 15 tion of said tool relative to the record; toollocking means; manual means operable by a single manipulation thereof to render said toollockin means inoperative, to move said gauge into contact with the record, and to render said 0 tool-locking means operative, in the sequence here named; and means for causing retraction of said gauge from the record upon the release of said manual m nation of a tool; a tool-setting gauge movable into contact with the record to determine the operative position of said tool relative to the record, said gauge and tool being arranged for relative movement; tool-locking means; power-operated means for moving said gauge into contact with the record and subsequently operating said toollocking means to effect a setting of the tool; and means, rendered effective at the completion of the setting of said tool, for retracting said gauge from the record.

17. In a phonograph record resurfacing machine having a support for a record to be resurfaced: the combination of a movable resurfacing tool; a tool-setting gauge normally retracted from the record and movable into contact with the record to determine the operative position of said tool with relation to the record, said gauge and tool being arranged for relative movement; tool-locking means; electromagnetic means energizable to move said gauge into contact with the record and to subsequently operate said toollocking means to efiect a setting of the tool; a circuit for supplying power to energize said electromagnetic means; and means, operated by said electromagnetic means at the completion of the setting of said tool, for opening said circuit.

18. In a phonograph record resurfacing machine having a mandrel for supporting a record to be resurfaced and an endgate for said mandrel movable into and out of a closed position: the combination of a latch for releasably holding said endgate in closed position; and footoperated means for releasing said latch from said endgate.

19. In a phonograph record resurfacing machine having a mandrel for supporting a record to be resurfaced and an endgate for said mandrel movable into and out of a closed position: the combination of a latch for releasably holding said endgate in closed position; control means for the machine having on and off positions; and foot-operated means for moving said control means to off position and concurrently releasing said latch from said endgate.

20. In a phonograph record resurfacing machine having a support on and from which a record is mounted and removed: the combination of a member operated in the mounting of a record on the machine; a resurfacing tool settable into operative position relative to a supported record; and means, controlled by said member, for causing the setting of said tool into operative position as an incident of record mounting.

21. In a phonograph record resurfacing machine having a support on and from which a record is mounted and removed: the combination of a member operated in the mounting of a record on the machine; a resurfacing tool settable into operative position relative to a supported record and releasable from said operative position; and means, controlled by said memher, for causing said tool to be first released from a previously set position and to be thereafter reset into operative position as an incident of record mounting.

22. In a phonograph record resurfacing machine having a record support and a resurfacing tool movable into and out of operative position in relation to a record on said support: the combination of means for locking said tool in operative position; tool-moving means; and an actuating member operatively associated with said tool-locking means and tool-moving means and unidirectionally movable to unlock said tool, to move the tool first away from and then towards the record into operative position, and to lock the tool in the sequence here named.

23. In a phonograph record resurfacing machine having a mandrel for supporting a record to be resurfaced and an endgate for said mandrel: the combination of a means for retaining said endgate in closed position; a resurfacing tool settable into operative position relative to the record; and means, operatively associated with said retaining means, for setting said' tool.

24. In a phonograph record resurfacing machine having a record support and a resurfacing tool settable into operative position in relation to a record on said support: the combination of current-actuated means'for setting said tool; means for causing the current supply to said tool-setting means to be broken as an incident to the completion of a tool-setting operation; and means manually operable to restore the current supply to said tool-setting means.

25. In a phonograph record resurfacing machine having a record support and a resurfacing tool settable into operative position in relation to a record on said support: the combination of current-actuated means for setting said tool; switch means for controlling the supply of current to said tool-setting means; means for causing said switch means to be opened as an incident to the completion of a tool-setting operation; a member operated incidental to the completion of the mounting of a record on the machine;

and means, controlled by said member, for closing said switch means.

26. In a phonograph record resurfacing machine having a mandrel for supporting a record, an endgate for said mandrel, releasable means operable to retain said endgate in closed position, and a resurfacing tool settable into operative position in relation to a record on said mandrel: the combination of current-actuated means for setting said tool; switch means for controlling the supply of current to said toolsetting means; means for causing said switch means to be opened as an incident to the completion of a tool-setting operation; and means, operated incidental to a release and subsequent reoperation of said retaining means, for closing said switch means.

RICHARD M. SOMERS.

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