US2184368A - Phonograph record resurfacing machine - Google Patents

Description

Filed Jan. 19, 1939 2 Sheets-Sheet 1 INVENTOR C'harl HuenlZc/z ATTORNEY Dec. 26, 1939. L H 2,184,368

PHONOGRAPH RECORD RESURFACING MACHINE 2 SheetsSheet 2 Filed Jan. 19, 1939 5- INVENTOR Y Charles Huenlich BY f ORNEY Patented Dec. 26, 1939" PHONOGRAPH REGORD RESURFACING MACHINE Charles Huenlich, Bloomfield, N. 3., assignor to Thomas A.'Edison, Incorporated, West Orange, N. 3., a corporation of New Jersey Application January 19, 1939, Serial No. 251,658

16 Claims.

This invention relates to phonograph record resurfacing machines, and more particularly to improvements in machines of the type employed for shaving or resurfacing wax-like or other records, such as are commonly used in connection with commercial phonographs or dictating machines.

Record resurfacing machines of the type above mentioned commonly comprise a mandrel for supporting a record for rotation, an end-gate for the mandrel normally latched in a closed or supporting position, a resurfacing tool mount ed on a carriage which is moved across the record by a feeding means driven coordinately with the rotation of the mandrel, and control means for starting and stopping the operation of the machine. The resurfacing tool is movable into operative position relative to the record to cause, as the record is rotated and the tool is moved steadily thereacross, a resurfacing, or a cutting away of a surface layer, of the record for the purpose of removing recordations therefrom to permit a re-use of the record.

In the usual operation of a record resurfacing machine the end-gate isfirst opened to permit a record to be mounted on the mandrel. When the record is mounted the end-gate is closed, the tool is set in operative position and the carriage is moved into an initial or start position, after which the machine is set in operation to cause a surface layer of the record to be cut away. The machine is then stopped, the endgate is opened, and the record is ejected from the machine as by a suitable record ejecting means.

It is an object of my invention to provide simple means for facilitating the operation of record resurfacing machines of the type above described.

It is another object of my invention to eject a record from the resurfacing machine by performing but a single manipulation on the machine. A feature of my invention is to provide such means as will cause the record to be ejected and the end-gate to be opened coincidentally with the unlatching of the latter from its closed or supporting position.

Another object of my invention is to insure the stopping of the machine when the end-gate is moved into an open or non-supporting position; in accordance with my invention,-this is done by the provision of means for automatically stopping the machine when the end-gate is unlatched.

Another object of my invention is to release the resurfacing tool fro-m set position upon the unlatching of the end-gate.

Another object of my invention is to provide means to insure that the machine will be in a stopped condition whenever the resurfacing tool is set into operative position.

A further object of my invention is to automatically stop the machine as an incident of releasing the tool from a set or operative position.

A still further object of my invention is to stop the machine, release the resurfacing tool from operative position and eject a record from the machine as an incident of unlatching the end-gate from its closed or supporting position,

Other objects and features of my invention, will more fully appear from the following description and the appended claims. 7

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

Figure l is a top plan View of a phonograph record resurfacing machine in which my inven tion is incorporated;

Fig. 2 is a vertical right-hand view of th mechanism of Fig. l the base plate of the machine and parts thereabove-appearing in cross section as along the line 22 of that figure;

Fig. 3 is a fragmentary plan view of the mechanism of Fig. 1, principallyshowing the interlinkage means between the machine-controlling means (the main switch appearing in on position), and the end-gate latching means, the record ejector and the tool-setting means;

Fig. 4 is a plan view of a portion of the mech- 7 anism of Fig. 3 showing the relative positions. between parts of the mechanism when the main switch is in off position; and

Fig. 5 is a diagrammatic view of the electrical circuit of the machine of Fig. 1. j,

Reference being had to Figs. 1 and 2 there will be seen a phonograph record resurfacing machine comprising a base plate l having a lefthandupright standard 2, right-hand upright standards 3 and 4 and an intermediate upright standard '5. In the right-hand'portion of the base plate I there is also providedan upright 45 boss 6 on which there ispivotally mounted by a screw 1 an end-gate 8. This end-gate is biased into open or non-supporting position by a tor sional spring 8, well known in the artythe end-gate is, however, normally held in a closed or Supporting position shown in Fig. 1 by a latch 9. This latch is pivoted tothe right end portion 10 of a guide rail H which extends laterally along the forward part of the machine. The end-gate 8 supports a comically pointed stud I2 55 adjustable with respect thereto by an adjusting screw I3; the left-hand standard 2 supports another conically pointed stud l4 secured thereto by a set screw |5. The studs l4 and I2 form left and right thrust bearings for a shaft l5 which passes through an oversized hole IT in the intermediate standard 5 and which carries a mandrel H? for holding a cylindrical record I9 to be resurfaced. In the operation of mounting a record on the mandrel l8, or removing a record therefrom, the end-gate 8 is opened to expose the right or open end of the mandrel. Such opening of the end-gate will occur whenever the latch 9 is moved to an unlatching position, by reason of the end-gate being biased into open position by the torsional spring 8'. When the end-gate is open the shaft I6 is intermediately supported by the standard 5 and retained in engagement with the stud M by means of a collar 20, secured to the shaft by a screw 2|, which abuts against the intermediate standard 5 to limit movement of the shaft in a rightward direction.

When the end-gate 8 is closed the mandrel H3 is rotatably supported in parallel relation to the guide rail Also in parallel relation to the guide rail H is a laterally extending rod 2| supported by the left and right standards 2 and 3. Slidably and tiltably mounted on the rod 2| is a carriage 22 having a sleeve bearing 22 embracing the rod. As shown in Fig. 2, the carriage 22 has a relatively heavy arm 23 curved forwardly over the mandrel l8 and terminating in a shoe 23' which normally slidably rests on the guide rail H. In the use of the machine the carriage 22 is fed or moved steadily in a leftward direction across the mandrel l8 coincidentally with a rotation of the latter. The carriage-feeding means comprises a laterally extending feed screw 24 rotatably supported by the left and right standards 2 and 4 and having a pulley 25 adapted to be coupled by a belt (not shown) to a drive pulley 26 on the shaft l5. Secured to the carriage sleeve 22 by the screws 21 is a resilient and rearwardly extending arm 28 carrying a feed-nut 29 which normally engages the underside of the feed-screw 24. The feed nut may be moved downwardly out of engagement with the feedscrew 24 by tilting the carriage arm 23 upwardly. When the carriage arm 23 is tilted upwardly the carriage is free to be manually moved across the mandrel i8. To limit the upward tilting of the carriage arm 23 there is provided on the carriage a downwardly extending arm 3!! which is adapted to contact a stop or ridge 3| on the base plate I.

On the right side of the carriage there is a boss 32 which substantially overlies the rod 2|. This boss carries a resurfacing tool 33 comprising a knife blade 34 mounted on a knife bar 35 which is slidably supported by the boss 32 for movement towards and away from the record I9. The means for setting the resurfacing tool into operative position-a position of the tool in which the knife blade 34 engages the recordand for releasing the same may be of a well known construction such as is disclosed in Brown Patent No. 2,137,383, issued November 22, 1938 and entitled Record shaving machine.

Such tool-setting and tool-releasing means may, in the present instance, be sufficiently described by the following statements: A cap 36 is slidably mounted on the boss 32, is guided by a guide rod 31, and is resiliently coupled to the knife bar 35 by a compression spring 38, coiled about the knife bar between a shoulder 35' on the bar and the top of the cap 36, so that when the cap is moved downwardly towards the record the knife bar 35 is yieldably moved therewith. The cap 36 is urged upwardly by a compression spring 39, but upward movement of the cap 36 relative to the bar 35 is limited by a head 4|! on the knife bar. By reason of the upward biasing of the cap 35 the knife bar 35 is normally maintained in inoperative position, this position being defined by the contact of a collar 4| on the bar 35 with the underside 4| of the boss 32. The setting and release of the tool 33 is controlled by a lever 42 pivoted on the right side of the boss 32 and having a short arm 43 which is coupled to the cap 36 by an angular link 44, the link being pivoted to the arm 43 by a pin 45 and to the cap 36 by a pivot screw 46 which slidably passes through a slot 44 in the link.

As the lever 42 is swung forwardly in a counterclockwise direction into its set position, shown in Fig. 2, the cap 36 and the knife bar 35 are moved towards the record to cause the tool to be set in operative position. Such tool-setting movement of the lever 42 is limited to the position shown in Fig. 2 by the impingement of the link 44 against a hub 42' of the lever. When the lever 42 is in this set position, the pin 45 is slightly past dead center with respect to the pivot axes of the lever 42 and the pivot screw 46, and, by reason of the upward biasing of the cap 36, the lever 42 is then urged in a counter-clockwise direction, the lever being thus releasably held in its set position and the tool 33 being yieldably maintained in operative position. However a slight tripping movement of the lever 42 in a clockwise direction such as to return the pin 45 across the dead-center line aforementioned will cause, by reason of the upward biasing of the cap 36, the tool to be released from operative position.

In the operation of the machine the carriage is first manually moved to bring the tool into a position overlying the record and the tool is set into operative position. The carriage is then moved into start positionthe position of the carriage when the tool is to the right of the record-and the machine is put into operation to cause the record to be rotated and the carriage to be fed in a leftward direction across the record. Such rotation of the record and feeding of the carriage may be effected by a suitable electrical motor M, schematically shown in Fig. 5, which may be located beneath the base plate I and be coupled to a pulley 4'! on the shaft I6 as by a belt (not shown) which may pass through an opening 48 in the base plate. As the tool 33 traverses the record in the operation of the machine a surface layer of the record is cut away, this cut-away layer being carried by a chip chute 49 downwardly through an opening 56 in the base plate. When the carriage has reached its terminal position, the tool 33 then having traversed the record, the machine may be stopped so that the operator may inspect the record to determine if another out from the record is necessary. Such stopping of the machine may, if desired, be automatically effected by an on and ofi limit switch 5| secured by the screws 52 to the top side of the base plate in the rearward lefthand portion thereof. The switch 5| may be serially connected, as by a cable 53, in a power supply circuit 54 (see Fig. 5) adapted for connecting the motor M with a suitable source of power by way of a plug 55. The switch is biased into on position and is provided with a side of the base plate l.

push button 56 movable leftwardly, as shown in Fig. 1, to throw the switch into 0 3 position. Extending rearwardly of the carriage 22 is a lug 57 carrying an adjustable screw 58 adapted to contact the button 56 and to thereby throw the switch 5! into off position, as the carriage 22 is moved into its terminal position.

The control means of the machine also comprises a switch 59, hereinafter referred to as the main switch, which is secured by a bracket Gil to the underside of the base plate I in the forward right-hand portion thereof. The switch 59 is preferably of the toggle variety adapted to snap into its on and off positions, and is serially connected, as by the terminals 6|, into the power supply circuit 54. The switch 59 is manually operable into its on and off positions by means of a forwardly extending contrcl lever 62 having a shaft 62 extending downwardly through a boss 63 provided on the under- Beneath the base plate l there is provided a small plate 64 which is secured to the shaft 62' by means of a collar 65 welded to the plate and connected by a pin 66' to the shaft 62.

The plate 64 has a rearwardly extending arm 6'! carrying a slotted, pivoted stud 53 through which slidably passes an operating arm 69 of the switch 59. When the control lever 62 is rocked leftwarctly and. rightw'ardlyj, the switch arm 89 is rocked respectively rightwardly and leitwardly to throw the switch into on and off positions, the switch 59, by reason of its toggle nature, snapping into its respective positions.

The above described structure and mechanism are common to record resurfacing machines heretofore 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.

To permit a setting of the resurfacing tool into operative position the machine must first be placed in a stopped condition. Thus an operation, in the use of a record resurfacing machine, which is normally associated with the operation of releasing the resurfacing tool from a set position is that of stopping the machine. The use of the machine may'therefore be facilitated by the provision of means for automatically stopping th machine as an incident of releasing the tool from a set or operative position.

To automatically stop the machine when the resurfacing tool is released froma set position, either of the switches 5| and 59 heretofore described, or a suitable auxiliary switch, may be thrown to off position as an incident of such tool release. In the illustration of my invention an auxiliary switch, herein given the reference character H3, is shown for the above purpose. This switch may be of the well known mercury type which is sensitive to angular position and may be also serially connected in the power circuit 54, as indicated in Fig. 5. With this arrangement, the power circu t 54 is opened, and

th machine is stopped, whenever any one of the switches 15!, 59 and it is thrown to off position, and the power circuit is closed, and the' screws 16, a cushion 15' being inserted between the clamp 15 and the bulb H. The bracket extends rearwardly of the carriage and is pivoted thereto by means of left and right forwardly extending legs ill and. 18 on the bracket which are hinged on a relatively long shoulder screw 19 provided on the right side of the carriage. The right leg '38 extends forwardly to form an arm 18 which is adapted to contact a cam Bl'l provided on the hub 42'. of the lever 42. The bracket M is biased downwardly, by its own weight, and the arm 58' is thereby biased upwardly into contact with the cam 86. By this contact of the arm '18 with the cam 89 the angular position of the mercury switch it is controlled, the cam having such shape that when the tool-setting lever 32 is in its forward or set position the switch It is prevented from being restored to its on posi- J tion in order that the machine will not be started as an incident of tool setting. For this reason a latch til is provided for holding the switch-ll in its upwardly inclined, or off, position. The latch 81 is pivoted by a screw 82 to a rearwardly extending lug 83 on the carriage, is extended upwardly between the legs vll' and 18 of the bracket M, and is biased towards the bracket M. in a clockwise direction as it appears in Fig. 2.

against a stop 84 by means of a tension spring a 85. When the switch 10 is swung upwardly into its off or upwardly inclined position, as during the release of the resurfacing tool from a set position, the front edge M of the bracket 14 slidably contacts a rear edge 8| of the latch 6i to move the latch forwardly. When the switch it reaches its upwardly inclined position the bracket engages a groove 85 provided in the latch the latch then snaps back, by reason of the spring 85, to hold the switch 10 in its upwardly inclined or off position.

In consideration of the mechanism so far described it will be seen that when theresurfacing tool is released from a set or operative position,

the auxiliary switch 10 is thrown to off position. If the machine is in operation at the time of such tool release, both the main switch 59 and the limit switch 5| being in their respective on positions, the operation of the machine will be stopped as an incident of that tool release.

switch 5!, as when the carriage is in its terminal position, the release of the tool from a set position, while causing the auxiliary switch H! to be thrown to off position, has no immediate effeet on the operation of the machine. If the tool is released and the carriage is returned from its terminal position to permit a resetting of the tool, the limit switch 5| moves into on position but the machine remains in a stopped condition even though the main switch 59 is in on position since the auxiliary switch it is retained in off position whenever the resurfacing tool is in a released or inoperative position. The actions which occur when the tool is set are now described.

If the tool is set while the main switch 5Q is in foff position the auxiliary switch it will return to on posititon coincidentally with such tool-setting, as is hereinafter described. If the If, 5 however, the machine is stopped by the limit tool is set while the main switch is yet in on position the auxiliary switch 10 is retained by the latch 8| in off position to prevent starting of the machine as an incident of such setting of the tool. After the tool is then set the auxiliary switch I0 may, however, be thrown to on position, to start the machine, by a simple manipulation of the control lever 62. The means for throwing the switch 10 by the control lever 62 comprises a rightwardly extending arm portion 90, provided on the plate 64,. having an arcuately shaped cam slot 89. Connected to the arm portion by a pin 88 engaging the cam slot 89 is a link member 81 which extends rearwardly along the rightward end portion of the machine below the base plate I. The link member 8'I is pivotally connected at its rearward end to an arm 9| of a lever 92 which is pivoted by a pivot screw 93 to a boss 93 extending downwardly from the base plate I. The lever 92 has another arm 94 which is pivotally connected by a pin 95 to the right end of a laterally extending bar 96. The bar 96 is disposed in parallel relation to the longitudinal rod 2| and extends below and along the rear edge of the opening 50 in the base plate. The bar is supported at its left end by a link 91 pivoted by a pivot screw 98 to a boss 98, such as the boss 93', and to the bar 96 by the pin 99. The bar 96 is thus mounted so that it may move forwardly and rearwardly in parallel motion.

On the right side of the carriage there is pivotally supported, by the shoulder screw 19, a lever I00 (best shown in Fig. 2) which is adapted to operatively connect the bar 96 with the latch 8|, and as is hereinafter described, to also connect the bar 96 with the resurfacing tool-setting means. The lever I00 comprises a vertical lower portion I0| adapted to slidably contact the front edge of the bar 96; a central substantially semi-circular portion I 02 pivoted at its upper end on the shoulder screw I9 adjacently of the right side of the carriage; and a bail portion I03 extending rightwardly beneath the screw I9 and terminating in a turned up lug I04 which is pivoted on the outer end portion of the screw I9 to secure a good bearing for the lever I0. The lever I60 is urged in a counter-clockwise direction to maintain its lower portion |0| in contact with the bar 96 by means of the spring 85 hereinbefore referred to, which spring is connected between a pin I02 on the lever I00 and the lower end 8|" of the latch 8|.

The link 81 is biased both forwardly and leftwardly by a tension spring I95 connected between the link and a pin I05 on the base plate, and the bar 96 is thus biased rearwardly, the most rearward position of the bar 96 being defined by the impingement of the bar against a stop lug 94 on the arm 90. When the switch 59 is in on position, the pin 88 carried by the link 87 is maintained, as by the leftward biasing of the link 81, in an inwardly extending notch I06 pro vided at the rearward end of the cam slot 89, as shown in Fig. 1. As the control lever 62 is rocked rightwardly toward its off position, the link 81 is moved rearwardly, the bar 96 is moved forwardly, and the lever I00 is thereby turned in a clockwise direction, as it appears in Fig. 2. As such turning of the lever I00 occurs a cross pin I07 on the lever contacts a cam face I 08 on the rear edge of the latch 8| and thereby turns the latch in a counter-clockwise direction to free the notch 96 from the bracket 14. Such release of the latch 8| from the switch I0 causes the switch to return as by gravity to on position.

The means for releasing the latch 8| is arranged so that the release of the latch occurs before the control lever 62 reaches its mid or deadcenter position. Since the main switch 59 is of the toggle variety it is not thrown unless the control lever 62 is moved through its dead-center position. Thus the latch 8| may be released to cause the auxiliary switch 10 to move into on" position without throwing the main switch 59 to 01f position, such release of the latch being effected by merely moving the control lever 62 rightwardly through a minor portion of its travel as into an intermediate position which is before the dead-center position of the lever. Such intermediate position may in practice be readily defined by a lug I, provided on the base plate I below the control lever 62, against which the operator may, for example, place his forefinger to form a stop for the control lever. Upon the release of the control lever 62 from such intermediate position, the lever snaps back into its leftward or on position by reason of the toggle nature of the switch 59.

When the control lever 62 is moved rightwardly to the intermediate position above mentioned the bar 96 is moved sufiiciently ahead to cause the release of the latch 8| as heretofore described. Further rightward movement of the control lever 62 causes the bar 96 to be moved still further ahead. When the control lever 62 is moved rightwardly through the final portion of its travel to off position the pin 88 is released from the notch I06; the bar 96 is then moved rearwardly by the spring I05, but such rearward movement is restricted so as to retain the latch 8| in an inoperative position while the main switch 59 is in off position. To release the pin 88 from the notch I06 the link 81 is provided with a principally leftwardly extending front portion 87 having a cam face I 09 on the end thereof. When the lever 62 enters into a final portion of its travel towards its off position the cam face I09 abuts against the boss 63 to limit the link 81 against leftward movement. The notch 89 moves, however, further leftwardly subsequent to the time the link 81 is so restricted in its movement, as by the movement of the control lever 62 towards off position, to cause the pin 88 to enter the cam slot 89. When this occurs the link 81 will move forwardly as because of the spring I5, the bar 96 then moving rearwardly. The spring I 05 is, however, relatively light so that the link 81 is not moved substantially before the control lever 62 reaches its off position. When the control lever 62 is in off position the link 81 is restricted in its forward movement by the impingement of the pin 88 with the forward end of the cam slot 89. This causes the bar 96 to be held in an intermediate position while the switch is in o position, this intermediate position being such as to maintain the latch 8| in a fully inoperative position. Thus when the tool is set while the main switch 59 is in off position the auxiliary switch I0 returns, as by gravity, to on position. To start the machine subsequent to such setting of the tool the main switch 59 is thrown to on position.

An additional feature of my invention is to perform on the machine, as an incident of unlatching the end-gate 8 from its supporting position, various normally manually performed operations: the throwing of the main switch '59 to off position to insure the stopping of the machine when the end-gate is opened, the releasing of the resurfacing tool from a set or operative position, and

the ejecting of a record from the mandrel I8.

The throwing of'the main switch 59 to off position by the unlatching of the end gate 3 may be first described.

Reference being had to Figs. 1 and 2, it will be seen that the end-gate latch 9 is secured to a shaft III! which extends vertically through the right end portion Id of the guide rail II. The shaft III has upper and lower bearing collars III and H2, the upper bearing collar III fitting in a seat I I3 to hold the shaft from downward movement. Secured by a pin 4 to the lower end of the shaft is a lever II5 having a forwardly extending arm I IS carrying a vertical pin I I7 which loosely fits in a slot I I8 provided in the arm portion 90 of the plate 64. When the switch 59 is in on position and the latch 9 is in operative position, as shown in Fig. 1, the pin II'I rests in the rearward end of the slot H8. Movement of the latch 9 to an inoperative position, as by turning latch 9 to operative position while the switch 59 is in off position does not change the position of the switch, such return of the latch merely causing the pin III to traverse the length of the slot H8 and to come to rest in the forward position thereof as shown in Fig. 4.

The means for releasing the resurfacing tool I from a set or operative position by the movement of the end-gate latch 9 to inoperative position may comprise principally the mechanism, heretofore described, for releasing the auxiliary switch II! from its off position. It will be recalled that the moving, of the control lever 52 through a minor portion of its travel towards off position causes the latch 8| to be released, or moved free from the bracket I4, to permit the switch I to move as by gravity to on position, and that the latch 8| is moreover held in a released or inoperative position while the switch 59 is in off posi tion in order that the resetting of the tool, while the switch 59 is so positioned, will cause the switch ID to return to on position. The throwing of the control lever 62 from on to off position causes, however, the lever I99 to be turned more than is necessary to release the latch 8I. This movement of the lever I99, which is additional to that necessary to release the latch 8|, is used to release the resurfacing tool from a set position. For this purpose the lever II!!! is provided with an arm II9 extending forwardly from the lug I M and terminating at a point below the arm 43 of the tool-setting lever 42, as shown in Fig. 2. When the control lever 62 is thrown from on to ofi position, which throwing may be effected by moving the end-gate latch 9 to inoperative position as heretofore described, the arm I I9 contacts the arm 43 of the tool-setting lever 42 and moves the lever 42 in a clockwise direction, thereby causing the resurfacing tool to be released from a set or operative position.

The means for ejecting a record from the mandrel I8 by moving the end-gate latch 9 to inoperative position comprises a rearwardly extending arm I22 on the lever I I to which is connected a vertical stud I2! projecting upwardly through an opening I22 in the base plate I. Pivotally connected to the stud I2I, by a pivot screw I23, is a pawl I24 which lies above the base plate I and extends leftwardly to a position in front of the intermediate standard 5. The left end portion I24 of the pawl IE4 is slidably supported unoperated position shown in Fig. 1.

by a ridge I25 on the base plate, and is biased forwardly against a stop I26 by a tension spring I 21 connected between the pawl and a pin I29 on the guide rail II, the pawl having a cam face I29 which the stop I26 slidably contacts as is hereinafter described. The left end of the pawl has a beveled end face I 3d and a hook It! which I38 on the base plate, and. is pivoted-at its rearward end, by a pin I39, to a rod I40 which extends slidably, in a lateral direction, through the intermediate standard 5. The rod I49 carries at its rightward end a shoe I II adapted to abut against the adjacent end of a record mounted on the mandrel I 8. The operation of the abovedescribed record ejecting means is as follows:

When the end-gate latch 9 is moved to inoperative position the pawl I 24 is moved in a rightward direction. Such imovement of the pawl cause the arm I33 to be also moved rightwardly as by the engagement of the hook I3I with the pin I32. The rightward movement of the arm I33 causes the shoe MI to abut against the left end Wall of the record I9 and to thereby eject the record from the mandrel I8. A rightward movement of the pawl I24 causes its left, end portion I24 to be moved rearwardly-, as by the contact of the pin I26 with the cam face I29, so that the hook I3I will be rendered free from the pin I32 at the time the record ejection is completed. Such freeing of the hook I 3| from the pin I32 causes the arm I33 to snap leftwardly, as by the spring I31, thereby restoring the shoe MI to-its The freeing of the hook I3I from the pin I32 also removes the biasing force from the pawl I24, as caused by the spring I31. The end-gate latch 9 is then no longer urged into operative position. As the endgate latch II is, however, returned to operative position the bevelled end face I39 of the pawl I214 slides over the pin I32 and the hook I3I again engages the pin to restore the record ejecting means for reoperation, the end-gate latch 9 being then resiliently held in operative position by the spring I31.

Although I have shown and described a single embodiment of my invention, it will be understood that many modifications and changes may be made therein without departing 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-supporting mandrel: the combination of an end-gate for said mandrel movable into and out of a mandrel-supporting position;

latching means for releasably holding said end gate in said mandrel-supporting position; means for controlling the operation of the machine; and means, operated by said latching means, for operating said control means.

2. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel; a latch for said end-gate having latching and unlatching positions; an o and on switch means operable to control the machine; and means, operated by said latch as the latter is moved from latching to unlatching positions, for operating said switch means from on to oif positions.

3. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel; a resurfacing tool movable between operative and inoperative positions relative to a supported record; a latch for said end-gate; and means, controlled by said latch, for moving said tool between said operative and inoperative positions.

4. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel movable into a mandrel-supporting position; latching means for releasably holding said endgate in said mandrel-supporting position; a resurfacing tool movable into an operative position relative to a supported record; and means operated by said latching means incidental to the release of said end-gate from mandrel-supporting position for causing the return of said resurfacing tool from said set position.

5. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel; latching means for said end-gate; means for ejecting a record from said mandrel; and means, controlled by said latching means, for operating said record-ejecting means.

6. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel movable into a supporting position; latching means for holding said end-gate in said supporting position; record-ejecting means; and means, operatively connecting said latching means with said record-ejecting means, for causing the operation of said ejecting means upon the release of said end-gate from said supporting position.

7. In a phonograph record resurfacing ma-' chine having a record-supporting mandrel: the combination of an end-gate for said mandrel having supporting and non-supporting positions; means biasing said end-gate into non-supporting position; latching means for holding said endgate in supporting position; record-ejecting means; and manipulatable means for operating said record-ejecting means and for coordinately releasing said latching means to permit said hiasing means to move said end-gate into nonsupporting position.

8. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel adapted to be held in a supporting position during the operation of the machine, and movable therefrom into a non-supporting position; record-ejecting means; and means operable by a single manipulation thereof to cause said record-ejecting means to be rendered operative and to coordinately cause said end-gate to be moved into non-supporting position.

9. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an end-gate for said mandrel; a latch for said end-gate movable into inoperative position; a record ejector biased into unoperated position; and means for automatically operating said record ejector incidental to the movement of said latch to inoperative position, said means being adapted to permit return of said record ejector to normal or inoperative position after said latch is moved a predetermined extent.

10. In a phonograph record resurfacing machine having a support for a record: the combination of a resurfacing toolmovable into and out of operative position relative to a supported record; switch means for controlling the operation of the machine; and means, controlled by said tool, for controlling said switch means.

11. In a phonograph record resurfacing machine having a support for a record: the combination of a resurfacing tool movable into and out of operative position relative to a supported record; means for controlling the operation of the machine; and means, operatively connecting said resurfacing tool with said controlling means, for causing operation of the latter as an incident of moving the former.

12. In a phonograph record resurfacing machine having a support for a record: the combination of a resurfacing tool settable into oper ative position relative to a supported record; switch means having off and on positions, for controlling the operation of the machine; and means operated incidental to the return of the set tool to inoperative position for causing said switch means to be moved from on to off position.

13. In a phonograph record resurfacing machine having a support for a record: the com.- bination of a resurfacing tool settable into an operative position relative to a supported record; an openable and closeable power circuit for the machine; and means, controlled by said resurfacing tool, for opening said power circuit as the set tool is returned to inoperative position.

14. In a phonograph record resurfacing machine having a support for a record: the combination of a resurfacing tool having operative and inoperative positions relative to a supported record; a power circuit; a main control switch and an auxiliary control switch serially connected in said power circuit and each having off and on positions; meansfor throwing said auxiliary switch to off position as said tool is moved to inoperative position; means for holding said auxiliary switch in off position when said tool is subsequently moved to operative position; and means operatively connected with said main switch for controlling the release of said switchholding means.

15. In a phonograph record resurfacing machine: the combination of a resurfacing tool movable into operative and inoperative positions relative to a record to be resurfaced; main and auxiliary control switches each having off and on positions; means for throwing said auxiliary switch to off position as said tool is moved to inoperative position; latching means for holding said auxiliary switch in off position; manipulatable means for controlling said main switch; and means controlled by said manipulatable means for releasing said latching means.

16. In a phonograph record resurfacing machine: the combination of a resurfacing tool movable into operative and inoperative positions relative to a record to be resurfaced; a control switch having off and on positions and biased into one of said positions; means for throwing said control switch into the other of said positions as said tool is moved into inoperative position; and a manually controlled latch for releasably holding said control switch in said other position.

CHARLES I-IUENLICI-I.

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