US2209835A - Phonograph record resurfacing machine - Google Patents

Description

R. M. SOMERS PHONOGRAPH RECORD RESURFACING MACHINE July 30, l1940.

Filed March 29, 1939 4 Sheets-Sheet l INVENTOR Kzchrd Mbmens ATTORNEY July 3o, 1940. R. M MERS 2209,835

PHONOGRAPH RECORD RESURFACING MACHINE Filed March 29, 1939 4 Shaets-Sheet 2 \l Y l E E 37 193 197 205 l f', 'f (e 202 34 51. 53 20/ i BY A TORNEY July 30, R M' SOMERS I rHoNoeRAPn aEcoRn nsunrxcwe momma Filed March 29, 1939 4 sheets-sheet s July 30, 1940.

PHONOGRAPH RECORD RESURFACING MACHINE Filed March, 29. 1939 Smets-smet 4 I INVENTOR RzclzarcM .Somers BY ht-g Kauai,... A QRNEY R. M. soMERs 2,209,835

Patented July 30, 1940 UNITED` STATES aeoafsss,l

PHoNoGaAPH RECORD aEsURFAcmG MACHINE v Richard M. Somers, West Orange, N. J., as signorto Thomas A. Edison, Incorporated, West Orange, N. J., a corporation of New Jersey Application March 29, 1939, Serial No. 264,774

34o1aims- (c1. zia-'1.1)

This invention relates to machines for resurfacing phonograph records, and more particularly to improvements in such machines for facilitating theirv use. While the invention has particular utility, and is shown and described in connection with a machine for resurfacing records of the type primarily used in connection with commercial phonographs or dictating machines, no unnecessary limitation thereto is intended. In some respects this invention has certain features in common with those disclosed in my copending application Serial No. 280,902, filed June 24, 1939, and entitled Phonograph record resurfacing machines and in a copending application of George H. Fritzinger, Serial No. 246,304, filed December 17, 1938, and entitled Phonograph Yrecord resurfacing machines, which application is connected by common ownership with the present application.

Phonograph record resurfacing machines of the type above mentioned comprise a rotatable record support, usually in the form of a mandrel, a carriage movable along the mandrel, a controllable driving means for rotating the mandrel and moving or feeding the carriage', and a resurfacing tool mounted on the carriage and settable into operative position relative to a record on the mandrel. The operation of resurfacing a record involves the performance of a series of primary operations comprising a mounting of the record on the machine, a setting of the tool into operative position, a starting of the driving means to cause rotation of the mandrel and a feeding of the carriage along the mandrel in a direction operative to cause a refacing, or a cutting away of a surface layer, of the record, a stopping of the driving means, and then a removal of the record from the machine. These primary operations may each involve several sub-operations, all of which are to be performed in certain sequence in the proper use of the machine.

It is an object of my invention to provide a phonograph record resurfacing machine in which the various operations in the resurfacing of a record are largely automatically performed and controlled.

It is another object ofV my invention to provide a machine for resurfacing phonograph records which is highly simple in the control of its operation and moreover well-nigh foolproof against mis-operation.

It is another object of my invention to provide new and improved control means for a resurfacing machine.

' It is another object of -my invention to provide such new and improved means in a phonograph record resurfacing 'machine as will render the machine essentially automatic in the performance of all operations required in a record resurfacing'except for av change'of record on the machine. 4

It is another object of 'my invention to provide means by which the machine is putinto operation, as an incident to the mounting ofa record on the machine, to cause a resurfacing of the record so mounted.

It is a further objectof my invention to provide, in a phonograph record resurfacing machine, means rendered effective as an incident to a single manipulation yon the machine to perform all operations pertaining to a record resurfacing except for a change of record on the machine. It is a feature'of my invention to cause thetool-'carriage to lbe reciprocatedacross the record, from and tofav start position, for each resurfacing ofa record, thei tool being, however, operative only during the last half cycle ofeach tool-carriage reciprocation.' y

l It is another object of my invention to provide a' feeding means for reciprocating the tool-carriage across the record from and to a start position at predetermined 'and different rates of speed. n

It is another object of my invention toautomatically set the resurfacing tool into operative -position at the completionv of the first half cycle of each tool-carriage reciprocation.

It is another object of my invention to provide power operated means for settingthe resurfacing tool.

It is another object to provide a driving means which is so controlled thatwhen the same is placed in operati-on it causes one reciprocation of the tool-carriage across the mandrel against and in a direction of normal record resurfacing movement.

Another object mandrel to be rotated only during the'movement of the tool-carriage in the direction of its record '1.45.

resurfacing movement. y

f It is anotherV object of my invention to provide a phonograph record resurfacing machine which is so arranged and controlled that upon the performance of a simple manipulation thereon a of my invention is to cause the from the following description and the appended claims.

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

Figure 1 is a top plan View, partly in section, of a phonograph record resurfacing machine incorporating my invention, the various parts of the machine being shown in the positions they assume during the progress of the tool-carriage through its record resurfacing movement, thek direction of which is indicated by the arrow shown;

Figure 2 is a right-hand sidelelevational View of the mechanism of Figure 1;

Figure 3 is an enlarged right-hand, fragmen tary view, partly in section, of the mechanism of Figure 1;

Figure 4 is a fractional view of the tool-setting means partly in section on line 4 4 of Figure 3, showing the relative positions assumed by the tool-setting means when the tool is set in operative position;

Figure 5 is a fractional sectional view of the tool-setting means taken along line 5 5 of Figure 2;

Figure 6 is a top plan view, partly broken away, of the rear right-hand portion of the machine showing mechanism automatically operated at the completion of the first half cycle of each carriage reciprocation for placing the machine in condition to produce a resurfacing of the record;

Figure 7 is a fractional vertical cross-sectional view taken along the line I-l of Figure 6;

Figure 8 is a right-hand View, taken on line 8 8 of Figure l and partly broken away, showing an automatic clutch for coupling the driving means of the machine to the mandrel;

Figure 9 is a diagrammatic view of the control circuit for the machine;

Figure 10 is a fractional front elevational View, partly in section, showing principally the aforementioned automatic conditioning mechanism for the machine;

Figure 1l is a sectional view on line II-I I of Figure 10;

Figure 12 is a right-hand elevational view of mechanism, controlled by the endgate latch, for starting the machine, the base plate of the machine appearing in cross-section substantially along'the line I2-I2 of Figure 1; and

Figure 13 is a fractional horizontal sectional view taken substantially along the line I3-I3 of Figure 12.

Reference being had to the figures, particularly Figures 1 and 2, there will be seen a phonograph record resurfacing machine incorporating my invention and comprising a base plate I having a ilange I extending downwardly from the rim thereof and provided with a left-hand upright standard 2, right-hand upright standards 3 and 4, and an intermediate upright standard 5. In the right-hand portion of the base plate adjacent to the` standard 4 there is an upright boss 6 on which there is pivoted, by a screw 1, an endgate 8 biased into open position by a torsional spring 9 but normally heldin a closed position (as shown in Figure l) by a latch'vll pivoted as at II to the right end portion I2' of a guide rail I2 which extends laterally along the front of the machine. Respectively carried by the endgate 8 and standard 2 are oonically pointed studs -I4 and I5 which form right and left thrust bearings for a shaft I6. This shaft passes through an oversized hole I1 in the intermediate standard 3 and carries amandrel I8 for holding a cylindrical record I9 to be resurfaced'. In the operation of mounting a record on, or removing a record from, the mandrel IS the endgate 8 is swung open to free the right end of the mandrel. When the endgate is open the shaft I6 is intermediately supported by the standard 5, but is retained in engagement with the stud I5 by a collar 20, secured to the shaft by a screw 2U', which abuts against the intermediate standard to limit the longitudinal movement of the shaft.

Supported by the left and right standards 2 and 4 is a longitudinal rod 2| on which there is slidably mounted a carriage 22 having a sleeve 23 embracing the rod as shown in Figure 2. The carriage 22 is substantially semi-circular in shape, curving forwardly from the rod 2| over the man- `drel I 8 and terminating in a relatively heavy front portion 22. In the portion 22 there is provided a slot 24 which slidably ts on a for- Wardly extending shoulder 25 provided on and along the guide rail I2. The carriage is thus mounted for sliding movement back and forth across, and throughout the length of, the mandrel I8, but is prevented from being tilted upwardly by the engagement of the slot 24 with the shoulder 25.

On the right side of the carriage there is provided an extension 25, square-shaped as viewed from the side thereof, which substantially overlies the rod 2l. This extension carries a resurfacing tool 2l comprising a knife blade 28 mounted on a knife bar 29 which is slidably supported by the extension 26 for movement towards and away from the record, the bar 29 being restricted against turning by a key 3l) engaging a longitudinal slot 3| provided in the bar. The means for setting the resurfacing tool into operative position-a position of the tool in which the knife blade 28 engages the record-and for releasing the same therefrom may be substantially of a construction such as is described in my copend- -ing application Serial No. 232,766, led October A tool-setting means of the above-mentioned type is shown in Figures l, 2, '3, 4 and 5, and comprises an olf-set gauge 32 to permit the setting A of vthe tool while the tool is off the record. The gauge 32 is slidably supported by the extension 23 to the left of the knife bar 29, there being provided in the extension 26 left and right parallel openings 33 and 34, radially disposed with respect to the mandrel I8, through which the gauge and bar respectively pass. Ihe bar and gauge are coupled to each other by means of an apertured link 35 which ts on reduced- diameter end portions 29 and 32 respectively provided along the upper parts of the bar and gauge, the link 35 being fastened on the reduced-diameter portion 32 of the gauge by a press t but being freely slidable along the reduced-diameter portion 29 of the bar. The bar 2S is normally retained in a Xed position relative to the gauge by means of a relatively light compression spring 36 coiled about the reduced-diameter portion 29 of the bar between the link 35 and a lock nut 3l at the upper end of the bar. The gauge 32 is controlled by a cap 32 which slidably ts over the extension 26 and which is guided in its movement by a guide rod 39, secured to the cap and slidably passing through an opening 40 provided in the extension 26 in parallel relation to the openings 33 and 34. The cap 38 is apertured to slidably t the reduced-diameter portion 32 of the gauge but is restricted-inl upward movement relative thereto by a head 4l on the gauge. The cap is normally held in contact with the head 4I-i. e.,

urged upwardly relative to the gauge-by a compression spring 42 coiled about the reduced-diameter portion 32 of the gauge between the cap and the link 35, and the cap is moreover urged upwardly relative to the carriage extension 26 by a relatively heavy compression spring 43 coiled about the guide rod 39. This upward urging of lthe cap 38 relative to the extension 26 normally retains the gauge 32 in unoperated position, dened by the Contact of a collar 44 on the gauge with the underside of the extension 26. When the gauge 32 is in unoperated position the resurfacing tool 21 is biased into inoperative position by reason of the spring 36 which urges the knife bar 29 upwardly into a position defined `by the contact of a collar 45 on the bar with the underside of the carriage extension 26, an enlarged opening 46 being provided in the cap 38 to permit the knife bar 29, and lock nut 31 mounted thereon, to pass freely therethrough in the movement of the resurfacing tool to inoperative position.

To set the resurfacing tool into operative position a downward movement is applied to the cap 3B. The means for applying such downward movement to the cap comprises a tool-setting lever 46 pivotally supported by a post 41 provided on the right side of the carriage extension 26. The lever is retained on the post 41 by means of a nut 48 and locking screw 49, and is connected to the cap 38 by a link 56 pivotally connected to an upwardly extending arm 46 of the lever 46 by a screw 5I and to the right side of the cap by the screw 52. The lever 46 is normally held ina position as shown in Figure 2 by reason of the upward biasing of the cap 38. When the lever 46 is turned in a counter-clockwise direction from the position just mentioned the cap is moved downwardly to move the gauge 32 and knife bar 29 towards the record, the link 50 being curved to clear a tool-locking means on the post 41, hereinafter described, in this counter-clockwise movement of the lever 46.

A downward movement ofthe cap 38 causes both the gauge 32 and knife bar 29 to be yieldably moved, by reason of the spring 42, towards the record. The knife blade 28 on the knife bar will normally not contact the record in the setting of the resurfacing tool since, in the normal operation of my invention, the resurfacing tool is set into operative position while the carriage is in the right end portion of its travel, the tool being then to the right of the record. The gauge 32, which is to the left of the tool, will, however, contact the record to define the operative position of the tool relative to the record.

When the lever 46 is moved in a counter-clockwise direction, the tool is first moved into operative position and then, in the terminal movement of the lever, the tool is locked, thereby setting the tool. The tool-locking means is shown in Figures 2, 3, 4 and 5, and comprises a pin 53 which is slidably mounted in the carriage eX- tension 26 for transverse movement relative to the longitudinal movement of the knife bar 29. The inner end of the pin 53 slidably contacts a fiat 54 on the knife bar, and the outer end extends slightly beyond the right side of the carriage extension. Pivoted on the post 41 between the lever 46 and the carriage extension 26 is a disk-shaped locking member 55 having an open sector 55 of substantially 90 angular length and provided with an annular shoulder 55" conveniently serving as a bearing for the tool setting lever 46. On the inner wall of the member 55 there is provided a beveled cam face 56. When the member 55 is turned in a counter-clockwise direction the cam face contacts the outer end of the pin 53 and presses the pin tightly against the knife bar to cause a locking of the bar against longitudinal movement. In order that such counter-clockwise movement of the member 55 will occur as an incident to they terminal movement of the lever 46, the lever 46 is provided with a lateral pin 51 which extends into the open sector 55. As the lever 46 is moved to set the tool the pin 51 rst traverses the sector 55 and then encounters an edge 58, defining the counterclockwise side of the open sector 55', to cause the member 55 to move in unison with the terminal movement of the lever 46, thereby locking the resurfacing tool in operative position. When the lever 46 is next released it is returned in a clockwise direction by reason of the upward biasing of the cap 38, the pin 51 then traversing the open sector 55 and the member 55 remaining in toollocking position by reason of the friction between the pin 51 and the member. The resurfacing tool is thus maintained in operative position upon the release of the lever 46, but the gauge 32 is retracted, or returned to its unoperated position, by the spring 43, the spring 36 being, however, compressed by the return of the gauge, as is indicated in Figure 4. Although the spring 36 resists the retraction of the gauge, the spring 43, which urges the cap 38 upwardly, is made sufciently strong to overcome the resistance of this spring. The spring 36 is, however, strong enough to return the resurfacing tool to inoperative position upon the unlocking of the tool, such toolunlocking occurring as an incident of moving the member 55 slightly in a clockwise direction to free the cam face 56 from the pin 53.

After the resurfacing tool is set .into operative position the record is put in rotation and the carriage is moved steadily across the record in such direction as to cause a surface layer of the record to be cut away by the tool. This cut-away layer, commonly known as shaving chips, is caught by a chip chute 56 secured to the knife bar 29 by the screw 59', which directs the chips downwardly through an opening 6D in the base plate, as for example, into a suitable container not shown.

In accordance with my invention the carriage 22 is reciprocated across the record for each record resurfacing operation, this reciprocation being preferably'from and to a start position at the left end of the record. During the first half cycle of such carriage reciprocation-i. e., during the time the carriage is traversing the record in a rightward direction--the resurfacing tool is in inoperative position and the mandrel I8 is stationary. At the completion of this first half cycle of carriage movement the carriage remains stationary for a predetermined time interval. During this interval a series of automatic actions occur to cause the setting of the resurfacing tool into operative position and then the retraction of thel tool-setting gauge 32, after which the mandrel is placed in rotation and the carriage is returned through the last half cycle of its movement to start position to cause a resurfacing of the record. When the carriage has been returned to start position to complete one cycle of reciprocative movement across the record, the carriage movement and mandrel rotation are each stopped and the resurfacing tool is released to inoperative position, thus restoring the machine into normal inoperative condition. Upon restarting the machine the above cycle of operations is repeated: ther carriage being rst moved rightwardly into a position wherein the tool is to the right of the record, the movement of the carriage being next stopped, the tool being set, a mandrel rotation and a reverse carriage movement being next started, and then at the completion of the record resurfacing movement of the carriage the tool being released to inoperative position and the machine being stopped. In the description of the above operations the driving means for the machine may be first described.

The driving of the carriage 22, as well as the rotation of the mandrel I8, may be effected by a suitable motor M, schematically shown in Figure 9, which may be located beneath the base plate and be coupled to a pulley 8| on the mandrel shaft iii as by a suitable belt not shovm which may pass through an opening G2 in the base plate. Integrally formed with the pulley 8| is a drive pulley 83 adapted to be coupled by a belt (not shown) to a pulley Ei provided at the left end of a laterally extending feed screw S5. This feed screw is rotatably supported by the standards 2 and il respectively carrying conically pointed studs 55 and 6l which serve as thrust bearings for the feed screw. Integrally formed with the carriage sleeve is a block 68 (see Figures 1 and 3) to which is secured by screws 99 a resilient, rearwardly extending arm 'lll carrying a feed nut normally engaging the undersi-de of the feed screw E5. Thus, a rotation of the feed Screw causes the carriage to be fed, or driven steadily, along the mandrel, the direction of carriage movement depending upon the direction of rot-ation of the feed screw.

The motor M may be of a series type, comprising a field 'E2 and armature i3 adapted to be connected with a suitable source of power by way of a power supply circuit 'M and plug 15. While the eld l2 and armature i3 are serially connected in the power supply circuit lll, the connection of the armature in the circuit is by way of a double-pole double-throw switch 18 operable to reverse the polarity of the armature relative to that of the field to control the direction of rotation of the motor. The switch 16 comprises pole members ll and 'i8 serially connected with contact members ll and 18' when the switch pole members are thrown to the left (as the switch appears in Figure 9) and with contact members ll and 18" when the pole members are thrown to the right. The contact members il and 'i8' are directly connected by a circuit 19 with the armature '13, and are moreover connected in criss-cross fashion with the contact members i8 and il, the contact members 'il' and lil being connected together by a conductor 8l) and the contact members i8 and Il being connected by a conductor 8|, the conductor 8|, however, serially including an adjustable resistor 82 and an openable and closable switch 83. When the switch i6 is thrown to the left the field 'l2 and armature 'i3 are directly and serially connected in the circuit lil with such relative polarity as to cause the feed screw 55 to be rotated in a direction to move the carriage from left to right. When the carriage reaches the end of its rightward travel the switch 18 is automatically thrown to the right, as is hereinafter described, to reverse the direction of rotation of the motor M so that the carriage will be next returned to the left. The rate of the motor speed during the return or leftward movement of the carriage is controlled by an adjustment of the resistor 82, this adjustment being such as to effect a normal rate of record resurfacing movement of the carriage. Since the rightward movement of the carriage is an idle movement in the normal operation of the machine, by reason of the resurfacing tool being then not set in operative position, the carriage is permitted to move rightwardly at a relatively high rate of speed, this increased speed being caused by reason of the resistor 82 being then out of the motor circuit.

The integral pulleys 6| and 63 are mounted for rotation on the mandrel shaft IB by means of left and right ball-bearing assemblies 84 and 85 interposed between the pulleys and the shaft and respectively fitting into left and right annular recesses 84 and 85' provided in the pulleys (see Figure l), the pulleys being restricted against longitudinal movement on the shaft in a rightward dire-ction by the abutment of the right ballbearing assembly 85 against a shoulder 86 on the shaft and against movement in a leftward direction by the abutment of the left bearing assembly 84 against a stop collar 81 on the shaft.

While the pulleys as above described are freely rotatable in either direction on the mandrel shaft I there is provided a one-way action clutch means for causing the mandrel shaft I8 to be gripped to the pulleys when the pulleys are turned in one of their movable directions. This. one-way actionclutch means is illustrated in Figures 1 and 8 and comprises an annular flange 88 extending rightwardly from the rim of the pulley 9|. To the right of the pulley 6| and within the flange 88 there is provided a disk 89. This disk is rotatably free of the pulley 8| and flange 88 and is secured to the mandrel shaft IB by a pin 95| extending through the hub 89' of the disk. As shown in Figure 8, the disk 89 is provided with a plurality (three in the present instance) of notches 9| cut in the periphery of the disk at equal angular distances from each other. These notches extend axially through the disk and are each right-angular in cross section, having one side 9| in radial alignment with the disk and the other side 9|" extending from the side 9| in a counterclockwise direction about the disk, as shown in Figure 8. Provided in each of the notches 9| is a laterally extending roller 9.2 of a length substantially equal to the width of the disk, the rollers being retained in their respective notches by the right wall 6| of the pulley 6| and by an annular plate 93 secured to the right wall of the disk 89 by rivets 93. Provided in the side 9| of each of the notches 9| is a recess 94 forming seats for respective compression springs 95 which urge the respective rollers 92 each in a counter-clockwise direction. The rollers 92 by reason of their biasing are normally wedged between the flange 88 and the side 9| of each of the notches 9| to cause the disk to be normally rotatably coupled to the flange. When the flange is turned in a counterclockwise direction this wedging of the rollers causes the mandrel shaft to be turned in unison with the pulley 6 When the flange 88 or pulley 6| is, however, turned in a clockwise direction the rollers 92 are each continually moved against their biasing and out of their wedged positions abovementioned, as by the friction between the flange and the rollers. In the clockwise movement of the pulley 6| the mandrel shaft |6 is thus no longer rotatably coupled therewith except for the friction between the pulleys 6| and B3 and the mandrel shaft, which friction arises from the contact of the ange 88 with the rollers 75 92 and from the bearing assemblies 84 and 85. In the rightward movement of the carriage Aacross the mandrel the pulleys 6| and 63, aswell as the feed screw G5, are eachturned in a clockwise direction as viewed from the right sides thereof. During such rotation of the pulley 6| the clutch between the pulley 6| and mandrel shaft I6 is maintained inoperative, as above described. I-owever to insure that the mandrel will not then be rotated by reason of the friction between the pulley 0| and mandrel shaft I6, as above noted, there is provided a mandrel brake (see Figures l and 3) comprising a lever 95 pivoted by a screw 91 to a bracket 08 secured to the top side of the base plate, to the rear of the standard 5, by the screws 9S. The lever 96 is provided with a cross rod |00 carrying a shoe I0| which is adjacent to the left end of the mandrel. The lever 96 is biased over center by a tension spring |02 connected between a pin |03 on the lever and a pin |04 on the base plate. This biasing of the lever 98 causes the brake to snap into inoperative position, defined by the contact of the lever 96 with a stop pin |05 on the base plate I, and operative position, defined by the contact of the shoe IOI with the adjacent end of the mandrel, as the lever is moved through dead center in the direction to place the brake in inoperative and operative positions. When the brake is brought into operative position the friction between the shoe |0| and the mandrel causes the mandrel rotation to be retarded. During the first half cycle of each carriage reciprocation-as when the carriage is moved to the rightthe mandrel brake is maintained in operative position to hold the mandrel against rotation, as is hereinafter described.

The means forvplacing the driving means in operation to start a feeding of the carriage in a rightward direction across the mandrel comprises the aforementioned reversing switch 10 schematically shown in Figure 9. This switch isV preferably of the well-known toggle variety (see Figures l and 2) having a threaded neck portion |00 from which extends an arm |01 adapted to snap into its respective positions. The switch 10 is mounted on a bracket |00 secured by the screws |09 to the flange i of the base plate in the front right-hand portion thereof. The bracket is apertured to receive the neck portion |06 of the switch, the switch being retained to the bracket, by a collar I I0 threading on the neck portion,in such orientation as to bring the movementlof the switch arm in a verticaldirection. Pivoted by a screw III on a boss ||2 extending inwardly, from the portion of the flange I which lies along the right side of the base plate is a relatively long lever |I3 extending from front to back beneath the machine. The front portion I I3 of the lever is offset to the left and apertured to receive the switch arm |01. Extending-up from the front portion I I3' of the lever is a relatively short arm |I4 provided with a flngerpieoe IIE which passes through an opening I|6 in the top of the base plate. When the arm |01 of the switch 16 is in an upward position the flngerpiece projects slightlyabove the base plate as shown in Figure 2. This upper position of the arm |01 represents the condition of the switch 16 when its pole members 11 and 18 respectively make connection with the contact members 11 and 18", this being the condition of the switch to cause a leftward or recordresurfacing movement of the carriage. When the carriage is at start position the vaforementioned switch 83 is retained in open position vthe sleeve on the shaft.

to render 'the driving means inoperative, asis vhereinafter described.` However, upon moving ward travel it causes a cam mechanism ||1 to be set into operation to first stop the carriage movement by disengaging the feed nut 1| from the feed screw 65 and then to set the resurfacing tool into operative position, after which the cam mechanism moves the mandrel brake to inoperative position, :fe-engages the feed nut with the feed screw and reverses the direction of rotation of the motor M to cause record rotationand a return feed or record resurfacing movement of the carriage.

The cam mechanism II1 isdisposed vbeneath the base plate I in the rearward right-hand portion thereof, as shown in Figures l, 2, 6 and l0, and comprises four differently shaped cam members IIB, H9, |20 and I2| mounted from left to right on a laterally extending shaft |22 rotatably supported at its left end by a standard |23 extending downwardly from the base plate and at its right end by a leg |24 extending downwardly from the flange of the base plate, the shaft being restricted against longitudinal movement in its bearings by apair of stop collars |25 and |26, secured to the shaft by the respective pins |25 and |26', which respectively abut against the left and right sides of the standard |23. While the several cam members are ycomparable with each other in diameter, cam members I I8 and |20 are substantiallyY longer in their axial dimensions than the cam members ||9 and |2l, the cam members I |8 and |20 respectively having annular recessesV I I8 and |20 cut in from the right sides thereof to reduce their respective weights, as

shown in Figure 11. The cam members of the 'pair IIB-I I9, Yas well as those of the pair |20- 12|, are immediately adjacent to each other,`

but the cam vmembers ||9 and |20 are spaced a small distance from each other along the shaft.

lhollowed out along its central portion to provide left and right'bearing surfaces |28 and |29 of The sleeve, and cam members fixedly mounted thereon, are thus free- Aly rotatably mounted on the shaft |22; but are 'restricted against longitudinal movement on the shaft, the restriction in rightward and leftward directions being effected by the respective abutlments of the sleeve |21 against the leg |24 and an annular ring |22 integrally formed with the vshaft.k

During the operation of the machine the shaft '|22 is rotated continuously, being driven by the feed screw 65 from a worm |30 provided on a shaft portion 65 at the right end of the feed screw. Engaging the worm |30 is a gear |3I secured by apin I3I to a vertical shaft |32 rotatably mounted-in and passing through a long boss |33l which extends above and below the base plate I.v Securedby a pin |34 to the lower `end of the shaft |32 isa bevel gear |34 which engages with a similar bevel gear |35 secured to the shaft |22 by a pin |36. The direction of the coupling between the feed screw 65 and the shaft |22 is such that when the feed screw is turned in a clockwise direction-the direction for imparting a rightward movement to the carriage 22-the shaft |22 is also turned in clockwise direction, this' direction of turning of the shaft |22 being of course reversed when the direction of rotation of the feed screw is reversed to return the carriage to its start position.

The cam members ||8, ||9, |26 and |2| are normally held in their initial or start positionthe position in which they are Shown in the gures-by the engagement of a detent |28, secured to the leg |24, with a notch |2| on the right face of the cam member |2|. The cam members may, however, be rotatably connected to the shaft |22 by means of a clutch |31 comprising a toothed clutch member |38 splined to the shaft |22 for movement between the gear |35 and the cam member |8. This splining is done by means of a pin |39 extending through the hub of the clutch member and engaging a groove segment |46 extending longitudinally of the shaft, as is shown in Figure 11. W'hen the clutch member |38 is moved to the right into contact with the cam member |8, it engages a tooth |4I, provided on an annular ange |4l extending leftwardly of the cam member, to rotatably couple the cam members with the shaft |22.

The means for controlling the clutch |31 comprises an over-center mechanism adapted to urge v the clutch into its engaged and disengaged positions depending upon the direction in which the mechanism is thrown. This over-center mechanism, shown in Figures 6 and 10, comprises a relatively long arm |42 pivoted to a boss |43 extending downwardly from the base plate at a point slightly to the rear of the clutch member |38. The arm |42 extends forwardly from its axis over the clutch member |138 and carries, at a point directly overlying the clutch member |38, a pin |44 which extends downwardly to engage an annular groove |38 inthe clutch member. Pivoted by a screw |45 on the forward end of the arm |42 is an upstanding post |45 having a radially extending rod |46 near the upper end thereof. Substantially above the post |45 is a relatively short lever |41 which is pivoted at a point substantially centrally of its length to a boss |48 extending downwardly from the base plate. The lever |41 is restricted in its turning to small angular movements in clockwise and counter-clockwise directions from a central or front-to-back extending position as is hereinafter described. Pivoted to the rearward end of the lever |41 by a shoulder screw |50 is a post |56 extending downwardly from the lever and apertured near its lower end to receive the rod |46. Coled about the rod |46 between the posts |45 and YT58 is a relatively heavy compression spring When the lever |41 is moved in a counter-clockwise direction through its central position until the post |56 carried by the lever is slightly to the left of the post |45 carried by the arm |42 the compression spring |5| urges the arm |42 in a rightward direction to cause the engagement of the clutch |31, and when the lever |41 is returned in a clockwise direction until the post |58 is slightly to the right of the post |45, the spring |5| urges the arm |42 leftwardly to cause the disengagement `of the clutch.

The lever |41 is biasedin a counter-clockwise directionthe direction of movement of the lever to cause engagement of the clutch |31--by a tension spring |52 connected between the lever and a pin |53 on the base plate. The lever 41 is controlled in its movement by the contact of the front tip |41' of the lever with a catch |54 on a laterally extending and relatively long pawl |55 pivoted at its right end, by a screw |56, to the left end of a slide member |51. This member |51 is mounted for lateral movement by means of a pair of shoulder screws |58 respectively passing through a pair of elongated slots |59 in the member to thread into a pair of bosses |60 extending downwardly from the base plate. The member |51 is normally retained in its most leftward position shown in Figure 6, as is hereinafter described; the pawl |55 is urged rearwardly in a clockwise direction into its normal position, defined by the contact of a stop lug |6| on the pawl with the rear edge |51 of the member |51, by a tension spring |62 connected between the stop lug |6| and a lug |63 turned down from the member 51. When the member |51 and pawl |55 are in such respective normal positions the lever 41 is retained, against its biasing, by the Contact of its tip |41 with the catch |54 in its clockwise position shown in Figure 6, the clutch |31 being then disengaged as above described.

When the pawl |55 is tripped-i. e., turned in a counter-clockwise direction to release the catch |54 from the lever |41-the spring |5| moves the lever |41 in a counter-clockwise direction, as against a stop pin |64 extending downwardly from the base plate, to cause the engagement of the clutch |31. Such tripping of the pawl |55 is effected by the carriage 22 when the carriage nears the end of its rightward travel across the record. The means for causing this tripping by the carriage comprises a lever |65 pivoted by a screw |66 to a boss |61 extending downwardly from the base plate. The lever |65 extends rearwardly from its axis and carries a relatively long vertical pin |68, near its rearward end, which extends upwardly through an arcuate opening |69 in the base plate, the lever being normally held in a leftward position defined by the contact of the pin |68 with the left end of the opening |69 by a tension spring |16 connected between the lever and a pin |1| on the base plate. Provided on the lever |65 near its axis is a short rightwardly extending arm |12 on which there is pivoted as at |13 a V-shaped pawl |14 which is biased in a counter-clockwise direction into a position defined by the contact of a stop lug |15 on the pawl with the right edge |65 of the lever |65, the biasing being done by a tension spring |16 connected between the stop lug |15 and a lug |11 turned down from the lever |65. As the carriage nears the end of its rightward travel, a rightward extension |18 of a rearwardly and downwardly extending arm |18, which is secured to the carriage sleeve 23 by a clamp |19, encounters the pin |68 of the lever |65 to cause a rightward or clockwise movement of the lever. As the lever |65 is so moved the pawl |14 imp-ingcs upon the pawl |55 and thereby moves the pawl |55 to free the catch |54 from the lever |41 (the pawl |14 having its end portion which impinges upon the pawl |55 increased in thickness by the Welding of a piece |14 thereon, as shown in Figures 6 and 10). The lever |41 then moves, as because of its biasing, in a counter-clockwise direction to cause the engagement of the clutch |31.

V`gWhen'the'clutch I 31 is engaged by the'carriage the cam members IIB, ||9, |20 and |2I, by reason of their coupling to the shaft |22, are turned in unison in a clockwise direction from their initial or start position. In substantially one revolution of the cam members, a series of actions take place to cause the machine to be conditioned to effect a record resurfacing operation.

One of the above series of actions is to prepare for operation the means for disengaging the clutch |31-i. e., to move the member |51 rightwardly to get the tip |41' of the lever |41 to snap over the catch |54 of the pawl |55 so that upon the return or leftward movement of the member |51 the lever |41 will be moved to cause the disengagement of the clutch. The means for moving the member |51 rightwardly comprises a relatively long arm which extends rearwardly of the member |51 to terminate at a point overlying the cam member |20. At the end of the arm I 80 there is provided a downwardly extending pin 8| which engages an angular cam groove |82 (see Figure 6) which extends through approximately one revolution about the periphery of the drum shaped cam member |20. The groove |82 starts at the left edge of the cam member and moves in a relatively short portion |82 of its angular length, proceeding in a counterclockwise direction about the cam member,v to

the right side of the cam member, the groove -wardly until the catch |54' is snapped over the tip |48' of the lever |41. In the further clockwise movement of the cam member |20 the member |51 dwells in its rightward position, the

.member |51 remaining in this position until the cam member |20 is returned suiiciently in a counter-clockwise direction to cause the pin |8| to re-engage the curved portion |82' of the cam groove as is hereinafter described.

While I have here shown and described the preparing of the means for disengaging the clutch |31 as occurring during the initial clockwise movement of the cam mechanism ||1, it will be understood that this preparing may occur at any time during the functioning of the cam mechanism so long as it occurs before the function of the cam mechanism is completed, leaving the cam mechanism to cause the disengagement of the clutch |31 as its final action.

Another in the series of actions automatically performed by the clockwise movement of the cam mechanism ||1 is the setting of the resurfacing tool into operative position. Before this tool setting takes place I prefer that the carriage movement be stopped so as to permit an accurate setting of the resurfacing tool on the record; it is, however, to be understood that a stopping oi' the carriage is not necessarily essential to the operation of my invention, particularly since the provision of a tool-setting gauge, heretofore described, enables the setting of the tool witha high degree of accuracy while the carriage is yet being fed across the record. A means for stopping the movement of the carriage is shown in Figures 1, 2, 7 and 10, and comprises a relatively long, laterally extending lever |83 pivoted centrally thereof by a pin I 84 to the top of a post |85extending upwardly from the base plate ata point slightly tothe rear and to the left of the vstandard 3. Ihe left end portion |83 of the lever terminates at a level just above a rearward extension 10 of the feed nut supporting arm 10, the right portion of the lever |85 being offset slightly to the rear to clear the standard 3 and terminating in a downwardly extending arm |86, turned over from. the lever. Pivoted to the lower end of the arm |86, by a pin |88, is a relatively short arm extension |89 which passes through an opening |81 in the base plate. This arm extension is normally held in a substantially downward but slightly rearwardly inclined position relative to the arm |86, as against a stop lug |99 on the arm |86, by a tension spring |9| connected between a turned-over lug |92 on the arm extension I 89 and the stop lug |90. The lever |83 is biased in a clockwise direction as viewed from the front, by a tension spring |94 connected between the lever |83 and a pin |95 on the standard 3, to urge the arm extension |89 downwardly towards the cam member ||9. 'I'he arm extension |89 is, however, normally held just free of the cam member |I9 by a stop pin |93 on the standard 3 which restricts the movement of thelever |83 in its biased direction. When the cam member ||9 is turned in aA clockwise direction through approximately 45 from its initial position, the arm extension |89 encounters an inclined 'cam face |96 forming the start of a ridge |96 which extends around the rim H9 of the cam member to Within approximately 25 of the position on the cam member which is adjacent the arm extension |89 when the cam mem ber is in its initial position. By the contact of the arm4 |89 with the face |96', the lever |83 is tilted in a counter-clockwise direction. When this tilting occurs the carriage is in the end portion of its rightward travel with the left end |83 of the lever |83 directly above the rearward extension 10 of the feed nut supporting arm 10.

Thus, in the tilting of the lever |83 the end |83 thereof impinges upon the extension 10 to move the feed nut 1| downwardly out of engagement with the feed screw 65, thereby stopping the movement ofl the carriage. In the further clockwise movement of the cam member subsequent to the contact of the arm |89 with the cam face |96', the feed nut is retained out of engagement with the feed screw, by the contact of the arm extension |89 with the ridge |96,'the feed nut being re-engaged with the feed screw when the arm extension |89 moves off from the end |96l of the ridge as is later explained.

It is important that the carriage be retained in the end portion-,of its rightward travel during the time the feed nut is disengaged from the feed screw in order that the resurfacing tool may be set into operative position while the tool is yet off the record. In order to prevent possible accidental manipulations of the carriage during the time the feed nut is disengaged from the feed screw, there is provided in the extension 10 of the feed nut supporting arm a notch 18 which, as the extension 10 is moved downwardly by the lever |83 to disengage the feed nut from the feed screw, engages a post |99 extending up from the base plate I, thereby locking the carriage.

. The action which is vnext performed by the cam mechanism after the stopping of the carriage is the setting of the resurfacing tool into operative position'. The means for setting the tool is shown in Figures 2, -7 .and l0 and comprises a rocker arm |91 pivoted centrally thereof by a screw-l I9 8 to the upper uend of an `upright support |99 secured to the right side of the standard 3 by the screws 200. The support |99 is offset to the right in order to position the rocker arm |91 so that its forward end portion |91' will be directly below a cross pin 20|, carried on a rearwardly extending arm 46" of the tool-setting lever IE6, when the carriage is in the end portion of its rightward travel. A rocking of the arm |91 in a direction to raise its forward end portion |91-i. e., a clockwise turning of the rocker arm |91 as it appears in Figure 2-will then impart a counter-clockwise or tool-setting movement to the lever 06.

The means for so moving the rocker arm |91 comprises a link 262 pivoted by a screw 203 to the rearward end of the rocker arm. Forming a downward extension of the link 202 is a bar 29d which is adjustably connected to the link by a pair of shoulder screws 205, the screws passing through a pair of respective slots 206 in the link 262 to thread into the bar. The bar 204 extends downwardly through the opening |81 in the base plate and terminates in a yoke 204' disposed between the cam members H9 and |20 and provided with an elongated slot 201 through which passes the sleeve |21 on which the cam members are mounted. The sleeve thus restricts the movement of the yoke 204 to straight up and down reciprocative motion. In order to impart such motion to the yoke 204 by the clockwise turning of the cam mechanism H1 the yoke 205 is provided with a pin 208 which engages a cam groove 209 provided in the right face of the cam member H9, as shown in Figure 7. When the cam mechanism |l|1 is in initial position the forward end portion |91 of the rocker arm |91 is positioned slightly below and suitably free of the pin 20| of the tool-setting lever 46, this positioning of the rocker arm |91 being controlled by the adjustable connection of the link 292 to the bar 204.

In proceeding in a counter-clockwise direction about the cam member H9 from the position in the cam groove 299 occupied by the pin 208 when the cam mechanism is in its initial position as shown in Figure 7, it is seen that the groove 209 dwells along the rim H9' of the cam member I I9 through an angular length exceeding the anguiar distance between the initial point on the cam member and the cam face |96 aforementioned, this angular length of the groove being approximately In proceeding further around the cam member H9 through approximately 135 it is seen that the groove 209 curves inwardly as at 209 towards the axis of the cam member; in proceeding still further through approximately it is seen that the groove curves outwardly, as at 209, towards the rim l I 9 of the cam member. Thus in approximately one revolution of the cam member |9 in a clockwise direction the groove 209 moves in the radial direction of the cam member from its rim to substantially its axis and back again to its rim. In this movement of the cam member the yoke 204 is moved, by the engagement of the pin 208 with the groove 209, first downwardly and then upwardly to complete o-ne cycle of reciprocative movement. The first half cycle of this movement-i. e., the downward stroke of the yoke ZEW-moves the rocker arm |91 in a clockwise direction to impart a counter-clockwise or tool-setting movement to the lever 46, the first portion of this movement of the lever i6 causing the-tool to be moved into operative position and the terminal movement of the lever 46 causing the tool to be then locked or set in its operative position as heretofore described., In the second half cycle'of the movement of the yoke 204-i. e., its upward movementthe rocker arm |91 is returned in a counter-clockwise direction to permit the tool-setting lever i9 to return by its biasing to its unoperated position, the tool remaining, however, locked in its operative position.

It is seen that when the cam mechanism H1 is moved through approximately two-thirds of one revolution in a clockwise direction, the carriage is first stopped and the tool is next set into operative position. The automatic action next performed by the cam mechanism H1 after the setting of the tool is the release of the mandrel brake, hereinbefore described, from operative position. To release the brake there is provided a slide bar 2H which extends laterally of the machine just 'above the base plate and slightly to the rear of the longitudinal rod 2|. The slide bar 2H is mounted on left and right bosses 2|2 and 2|3 on the base plate by a pair of shoulder screws 2M and 2| which pass through respective slots Zil and 2|5 in the slide bar to thread into the respective bosses 2|2 and 2I3. At the left end of the slide bar there is provided a hook 2|6. This hook is adapted to catch on a turned-down lug 2|1 on the lever 96 of the mandrel brake to release or move the mandrel brake to inoperative position as the slide bar is moved to the right. To cause such rightward movement of the slide bar there is provided on the bar at its rightward end a right-angle arm 2|8 which extends downwardly through an opening 219 in the base plate and then rearwardly, at the level of the top of the cam member I8, to a position overlying this cam member. The cam member H8 is in the shape of a drum having a cam extension 220 provided thereon which starts at a point at about two thirds the angular distance about the cam member proceeding in a counter-clockwise direction. Extending downwardly from the rearward end of the arm 2|8 is a pin 22| which, in the last one third clockwise movement of the cam member H8, is impinged upon by the cam extension 220 to cause the slide bar 2| l to be moved to the right to release the mandrel brake,

The action which is caused to occur by the cam mechanism H1 subsequent to the release of the mandrel brake is the rra-engagement of the feed nut 1| with the feed screw 65. Reference being had to Figure 7 it will be seen that the ridge |96 on the cam member H9 terminates as at |96" at a point which is approximately 25 from the point on the cam member which is adjacent the arm extension |89 when the cam mechanism H1 is in its initial position. Thus, when the cam member l |9 has been moved in a clockwise direction through approximately 335 the arm extension |89 rides oi from the ridge |96 to permit the lever |83, which is controlled by the cam member I9, to turn in a clockwise direction by reason of its biasing until the lever is stopped by the stop pin |93 as heretofore described. This clockwise turning of the lever |83 is suiiicient to free the left end portion |83 of the lever from the extension 19' of the feed nut supporting arm, the upwardly biased supporting arm 10 then moving upwardly to unlock the carriage by the freeing of the notch 10 from the post |49 and to re-engage the feed nut with the feed screw.

The last in the series of actions caused by substantially one revolution in a clockwise direction of the cam mechanism I1 is the throwing of the reversing switch 16 to reverse the direction of 75 rotation of the motor M. It will be recalled that to start the machine the ngerpiece I I is moved downwardly to cause the switch arm |01 to snap into its downward position, thereby throwing the switch pole members 11 and 18 to the left as they appear in Figure 9. To reverse the motor M it is only necessary to move the switch arm |01 upwardly to cause the pole members 11 and 18 to be thrown to the right. To effect this throwing of the switch the lever ||3 is extended rearwardly and downwardly from its axis to terminate in a finger 222 which is radially in line with the cam member |2I. The cam member |2| is in the form of a relatively thin disk having a short cam extension 223 on its periphery. When the fingerpiece ||5 is moved downwardly to start the machine the finger 222 is moved substantially into contact with the disk portion of the cam member I2I. The cam member |2I is so oriented on its shaft that when the cam mechanism is in its initial position the cam extension 223 is displaced approximately 15 in a clockwise direction from .the nger 222. Thus when the cam member I2I is moved approximately 345 in a clockwise direction, which is approximately further than the rotation required to re-engage the feed nut with the feed screw, the cam extension 223 impinges upon the finger 222 and moves the lever I|3 in a direction to cause the arm |01 of the switch 16 to be moved upwardly, thereby reversing the motor M.

It will be seen that in the interval between the time the feed nut is re-engaged with the feed screw and the time the switch 16 is thrown to reverse the motor M, the carriage is moved to the right. The cam mechanism may be arranged so that this time interval is relatively short, the necessary time interval being only that which is required to positively insure the re-engagement of the feed nut with the feed screw before the reversing of the motor M. In the present instance, the feed nut is re-engaged with the feed screw when the cam mechanism has turned approxi--` mately 335 and the motor is reversed when the cam mechanism is turned approximately 345, the rightward movement of the carriage thus occurring only during a 10 movement of the cam mechanism.

Upon the reversal of the motor M the cam mechanism |I1 is immediately started in a reverse or counter-clockwise direction and the mandrel I8 is set in rotation by reason of the oneway action clutch which couples the pulley 6I to the mandrel shaft I6. There is also immediately imparted to the carriage a record resurfacing movement-i. e. a movement in a leftward direction-by reason of the feed nut being engaged with the feed screw at the time the motor M is reversed. In order that the feed nut will be retained in enaggement with the feed screw during the reverse or counter-clockwise movement of the cam mechanism ||1 the arm extension |89 is pivoted on the arm |86, as heretofore described. In the counter-clockwise movement of the cam member II9 the end |96" of the ridge |96 en counters the arm extension |89 and moves it forwardly against the biasing of the spring |9I, the lever |83 remaining during this time in its biased position, defined by the contact of the lever with the stop pin |90, wherein the lever is free of the extension 19 of the feed nut supporting arm.

The reverse or counter-clockwise movement of the cam mechanism I1 to its inital or start position is completed during the first portion of the leftward or record resurfacing movement of the carriage. At the time the motor M is reversed the' pin 208 occupies the position in thecam groove 209 as shown in dash dot linesin Figure '1. During the reverse or counter-clockwise movement ofthe cam mechanism the tool-setting mechanism is adapted/to remain inactive, this being permitted by the provision of a groove 224, which extends alo-ng the rim 'II9' of the cam member II9, through which the pin 208 may pass. In order to insure that the pin 208 will enter the groove 224 in the reverse movement of the cam mechanism the yoke 204' is biased upwardly, by a tension spring |99 connected between the rocker arm |91 and its support |99, to cause the pin 208 to move upwardly against the rim I I9 of the cam member as soon as the pin has passed out of the groove portion 209" in the nal portion of the clockwise movement of the cam mechanism. As the pin I|18 traverses the groove 1224 is encounters a 'tongue-shaped member 225 which normally forms a separation between the groove 224 and the groove 209. The member 225 is pivoted at at 226 to the cam member and is biased outwardly against the rim II9 by a small leaf spring 221 provided in a small recess 228 in a raised portion 229 of the ca m face which divides the cam grooves, 209 and 209" from the cam groove 224, the spring 221 having a bracket extension 221 at one end which is secured tothe cam member as by Weld ing and contacting a short arm 230 of the tongue 225 at its other end. As the pin 208 traverses the groove 224 in the counter-clockwise movement of the cam member I I9 the pin encounters the outer edge 225` of the tongue-shaped member 225 and moves it inwardly and then moves on to enter the cam groove 209, the member 225 snapping back against the rim I I9 when the pin has entered the cam groove 209. During the clockwise movement of the cam member, the pin encounters the inner edge 225" of the tongue 225 and is thereby directed into the cam groove 209 as heretofore de scribed. During -the final return movement of the cam mechanism |I1 the arm extension |89, when '1t rides oi of the ridge |96 by way of the cam face |96', snaps back into its normal position as because of its biasing spring I9I. Also in the final return movement of the cam mechanism the member |51 is moved to the left by the engagement ofthe pin I 8| with the curved portion |82 of the cam groove |82 of the cam member |20. This leftward movement of the member |51 causes the lever |41 to be turned in a clockwise direction` by its contact with the catch |54. When the member |51 has reachedits most leftward position as defined by the engagement of the pin |8I with the end of the cam groove |82 the lever |41 has been turned sufliciently to cause the arm |42 to Asnap over center to the left to cause the clutch |31 to be disengaged. The cam mechanism I |1 is then fully returned to its initial position and in condition for re-operation, the cam mechanism being retained in this vposition during the time the clutch |31 is disengaged by the detent |28.

Dfuring the return of the cam mechanism the carriage is moving to the left. Normally the carriage will be fed suflciently to the left to permit the full return of the lever |65, which is controlled by the carriage, before the member |51 is moved enough leftwardly to bring the tip of the pawl |55 into the path of the pawl |14, thus normally inf suring that the pawl |14 will get behind the pawl |55 before the latter pawl enters the path of the former. If under any circumstances the pawl |14 shouldget in front of the pawl |55 in its ati return movement it will snap over the pawl into normal position relative thereto when the lever |65 is returned into its most leftward position.

When the carriage nears its start position, the resurfacing tool having moved to the left of the record, a lever 23| which is pivoted on the right side of the carriage by a shoulder screw 232 is automatically turned to cause the release of the resurfacing tool to inoperative position. Reference being had to Figures l, 2 and 3, it will be seen that the lever 23| is provided with a forwardly extending arm 233 normally contacting the underside of a forward extension 234 of the tool-locking member 55, and with an arm 235 which extends downwardly to the rear of the carriage. Secured to the top side of the base plate by the screws 236 is an upstanding bracket 231 having a turned over cam 238 lying in the terminal path of the arm 235. When the carriage enters its start position the cam 238 impinges on the arm 235 and thereby turns the lever 23| slightly in a clockwise direction. This turning of the lever 23| imparts, as by the contact of the arm 233 With the extension 234, a clockwise movement to the member 55 to cause the release of the resurfacing tool from its set position.

Secured on the rear end of the carriage by the screws 239 is a short downwardly extending arm 240 which, as the carriage nears its start position, contacts the lever 96 of the mandrel brake and moves the lever in a counter-clockwise direction through its dead-center position, the lever being then moved onwardly in a counter-clockwise direction by the spring |02 until the shoe ||l| of the mandrel brake impinges against the mandrel I8 to render the mandrel brake operative. In the counter-clockwise movement of the lever 96 to render the mandrel brake operative the lug 2 of the lever 96 impinges against the hook 2|6 of the slide bar 2| and moves the bar leftwardly, the pin 22| being at this time free of the cam extension 220 of the cam member |8, by reason of the cam mechanism being in its initial position, to permit the slide bar to be so moved.

In accordance with my invention, when the carriage is returned to start position to complete one cycle 'of reciprocative movement across the record the carriage not only causes the automatic actions above described but also causes the stopping of the machine. The stopping of the machine may very appropriately occur as an incident to the placing of the mandrel brake into operative position. It is seen that when the carriage moves the lever 96 through dead center position the lever is moved onwardly by the spring |02 to render the mandrel brake operative. This final movement of the lever 96, which is caused by the spring |02, opens the aforementioned switch 83, this opening of the switch 83 causing the machine to be stopped since the s-witch is serially included in the power supply circuit '14 of the machine when the reversing switch I6 is thrown to Cause a return or leftward movement of the carriage. Reference being had to Figures 1 and 10 it will be seen that the switch 83 comprises a frame 24|, secured to the top side of the base plate in the rearward left-hand portion thereof by the screws 242, and having a stack 243 l insulatedly carrying a pair of forwardly extending left and right contact springs 244 and 245 biased into a normally closed condition. These contact springs 244 and 245 are connected by means of a cable 246, which passes through an opening 241 in the frame 24 into the motor circuit. Secured to the left contact spring 244 is an insulating bar 248 which extends forwardly from the switch by way of an opening 248 in the frame 24| into a position directly to the left of the slide bar 2| When the slide bar 2|| is moved leftwardly by the final movement of the lever 96 to place the mandrel brake into operative position, the slide bar impinges upon the bar 248 and thereby moves the contact spring 244 leftwardly to break connection with the contact spring 245, the motor circuit 14 being thus opened to stop the machine.

In recapitulation, it is seen that the switch 83 is included in the motor circuit until the machine is restarted to produce a rightward movement of the carriage by throwing theA reversing switch 16. When the carriage reaches the end of its rightward travel the switch 'H6 is automatically reversed to again include the switch 83 in the motor circuit; however, before the switch 16 is thrown to reverse the machine the mandrel brake is released or moved to inoperative position. This release of the mandrel brake permits the switch 83 to close by its own biasing so that when the switch 'i6 is thrown to reverse the machine, the machinel is rendered operative to eifect a record resurfacing movement of the carriage.

After the carriage has returned to start position, having moved back and forth across the record to complete a resurfacing operation on the record, the machine may be restarted to complete another record resurfacing operation by throwing the switch 1B, as by merely pressing the fingerpiece l5 downwardly to a position wherein it is substantially on the level with the base plate. In-the proper operation of the machine the switch .'6 should be manually thrown t0 reverse the machine only when the carriage is in its start position since the mandrel brake is not rendered operative and the tool is not released until. this position of the carriage is reached. To prevent possible accidental manipulation of the switch 'l5 while the carriage is out of start position there is provided along the length of the guide rail a bar 249 which is slidablymounted for limited movement along the guide rail by a pair of screws 25|) and 25| which pass through longitudinal slots 259 and 25|' in the bar to thread into respective left and right bosses 250" and 25|" extending forwardly of the guide rail. At the right end of the bar 249 there is provided a turned-over lug 252. When the bar 249 is in its rightward position, as dened by the contact of the screws 258 and 25| with the slots 259 and 25V, the lug 252 forms a cap over the ngerpiece H5 to prevent access thereto. The bar 249 is normally held in its most rightward position by a tension spring 253 connected between a pin 254 on the bar and a pin 255 on the guide rail. However, as the carriage is moved leftwardly into its start position-the switch 76 having been reversed and the lingerpiece ||5 being in an upward position as shown in Figure Z-the lower end of its front portion 22 impinges upon an upstanding hook 249 provided at the left end of the bar 249 and moves the bar 249 leftwardly to move the lug 252 off from the ngerpiece ||5. The ngerpiece IE5 is then free to be manually moved downwardly to restart the machine.

If the operator should for any reason desire to stop the operation of the machine during the course of a tool-.carriage reciprocation across the record he may do so by throwing a single-pole single-throw switch 256, preferably of the toggle variety, which is serially included in the power supply circuit 14 as shown in Figure 9'. 'Ihe switch 256 is shown in Figures 1 and 2 and is mounted in a recess 251 in the carriage 22 near the front portion 22' thereof. The switch 256 is provided with a threaded tubular neck portion 258 extending through the right wall of the carriage on which there is threaded a nut 258 to hold the switch in place. Extending from the neck portion 258 to the right of the carriage is an arm 266, and leading from the switch is a cable'2r6lby which the switch is connected in the power supply circuit 14. The switch is so oriented that the switch arm 26D will move in a substantially vertical direction, with upper and lower positions of the switch arm representing the closed and open conditions of the switch. To facilitate the operation of the switch there is provided a lever 262 which is pivoted by a shoulder screw 263 on the right side of the carriage, the lever being spaced from the carriage by a spacer 264 embracing the screw 263. 'Ihe forward end of the lever 262 terminates in a handle portion 262'; just to the rear of the handle portion 262 are provided upper and lowerturnedover lugs 265 and 266 to form a socket which engages the switch arm 260. Thus as the lever 262 is moved, as by its handle portion 262', into downward and upward positions the switch arm 26D is moved to throw the switch 256 into its open and closed positions to stop and start the machine. In order that the resurfacing tool may also be released to inoperative position as an incident to such stopping of the machine the lever 262 is extended rearwardly of its axis and there provided with a turned-over lug 261 adaptedto form a seat which, when the lever 262 is moved downwardlyto stop the machine, impinges upon a forwardly extending arm 268, provided on the tool-locking member 55, to move the member 55 in a clockwise direction and thereby effect the release of the resurfacing tool. g

When the resurfacing of the record is cornpleted, usually one cut from the record being sufcient, the record is removed from the machine. To remove the record the endgate latch I0 is first moved to inoperative position to permit the endgate 8'to swing open, as by its biasing, and then the record is ejected from the mandrel. A record ejector of the type shown in the figures is well known in the art, and is sufliciently described as follows: A leftWardly .extending handle 268 having a hub 210 is pivoted on a pin 21| supported at one end by the guide rail l2 and at the other end by the intermediate standard 5. From the hub 216 there extends a vertical. arm 212 carrying a shoe 213 adapted to impinge against lthe left end of the record when the ejector is operated. The ejector is normally maintained in an unoperated position, shown in Figure 1, by a torsional spring 214 coiled about the hub 218 and constrained at its ends by the handle 269 and base plate I. To operate the ejector the handle 269 is raised against the force of the spring 214 to move the shoe 213 rightwardly against the record to push the record oli' from the mandrel.

In accordance with my invention'there may be provided means by which the machine is put into operation, as an incident to the mounting of a record on the machine, to cause a resurfacing of the record so mounted. The last of the operations in the mounting of a record' on the machine is the latching ofthe endgate 8 into its closed position. This latching of the endgate may cause the machine to be putintooperation to complete aresurfacin'g ofl the record, as by the means shown in detail in Figures 12 and 13. It is seen that the endgate latch IID is in the form of a bolt 215 passing through a horizontal recess 216 in the right end portion I2' of the guide rail and connected to a vertical shaft 211 pivoted in an opening I2 extending downwardly from the recess 216 through the end portion I2' of the guide rail. The upper end portion 211' of the shaft 211 is `reduced in diameter and threaded to -receive a nut 218 which rests on the portion l2 to hold the shaft against downward movement; the intermediate portion 211" of the shaft is milled into the shape of a bar (see Figure 13) and the bolt 215 is apertured to receive this bar-shaped portion, thereby keying the bolt to theshaft. Secured to the lower end of the shaft 211, by a pin 219, is an arm 280 which extends rightwardly in line with the bolt 215 to terminate at a .point overlying the lever II3.

Pivoted on the lever H3, by a screw 28|., is a V-shaped pawl 282 which is so disposed relative to the arm 280 as to lie directly in front of the arm when' theV endgate latch I0 is in operative position. The pawl 282 is biased in a clockwisedirection towards the arm. 288, against a stop lug 283`on the `lever H3, by a tension spring 284. connected between the pawl and a lug 285 on the lever H3. When the endgate latch I0 is opened or moved to inoperative position the arm.

280 impinges against the pawl and moves the pawl against its biasing, the a'rm thus sliding over the pawl and the pawl then snapping back into its biased position. When the endgate latch is'moved to operative position the arm 280 impinges upon an inclined cam face 286 of the pawl and thereby moves thejlever H3, which carries the pawl 282, downwardly to throw the switch 16 so as to start the machine. Thus by the locking of the endgate into closed or operative position-which is the final action in the mounting of a record on the machine-the machine is put into voperation to effect a resurfacing of the mounted record.

While I have herein described and illustrated one embodiment of my invention it will be understood that this embodiment isl 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: Y

1. In a phonograph record resurfacing machine having a4 record support and a carriage: the combination of a resurfacing tool on said carriage settable into operative position relative to a record on said support; driving means for feeding said carriage across said support; and means effective without prior adjustment of the tool relative to the record and operated by said driving means to automatically set said tool into1 operative position.

2. In a phonograph record resurfacing machine having a record support: the combination of a carriage; a resurfacing tool on said carriage settable into Voperative position relative to a record on said support; means for moving said carriage across said support; and power-operated means, effective without prior adjustment of the tool relative tothe record and controlled by said carriage, for automatically setting said tool into operative position.

3. In a phonograph record resurfacing machine having a support for a record to be resurfaced and a carriage movable along said support: the combination. of aresurfacing tool on said carriage having a fully released position and movable therefrom into 'operative relationship with the record; tool-setting means comprising resilient means for yieldably moving said tool in one operation from.` said fully released position into said operative relationship with the record; driving means for said carriage; and means for causing operation of said tool-setting means by said driving means.

1 4. In a phonograph record resurfacing machine having a support for a record and a car- -riage movable along said support: the combination of a resurfacing tool on said carriage movable towards and away from the record; toolsetting means for moving said tool towards the recordl into operative position relative thereto, said means comprising means adapted to coact with the record to determine said operative position of the tool; and power means, controlled by said tool-carriage, for operating said tool-setting means.

5. In a phonograph record resurfacing machine having a rotatable record support and a carriage: the -combination of record-resurfacing means mounted on said carriage and settable into operative position relative to a record on said support; power means placeable in operation 'to cause said record-resurfacing means to be set into operative position; and means, operated by said power means and automatically rendered effective subsequent to the completion of the setting of saidy resurfacing means, for starting both a rotation of said record support and a record resurfacing movement of said carriage.

6. The structure as claimed in claim 5, further including means, fully controlled by said carriage at the completion of its record-resurfacing movement, for moving said record-resurfacing means out of set position and for stopping said power means.

7; In a phonograph record resurfacing machine having a record support: the combination of a carriage having record-resurfacing means mounted thereon; power operated drivin-g means placeable into operation to cause said carriage to be reciprocated along said support; and means, fully controlled by said carriage at the completion of a single cycle in its reciprocative movement, for placing said driving means out of operation.

8. In a phonograph record resurfacing machine having a record support and a resurfacing tool settable into operative position relative to a record on said support: the combination of a carriage for said resurfacing tool; driving means for reciprocating said carriage along said support; means, controlled by said carriage at the completion of the first half cycle in its reciprocative movement, for setting said tool into operative position; and means, controlled by said carriage at the completion of a single cycle in its reciprocative movement, for moving said tool out of operative position and stopping said driving means.

9. In a phonograph record resurfacing machine having a record support and a resurfacing tool settable into operative position relative to a record on said support: the combination of a carriage for said tool; reversible driving means for feeding said carriage back and forth relative to said support; tool-setting means; reversing means for said driving means; and means, controlled by4 said carriage, for operating said toolsetting means and reversing means in the sequence here named.

10. In a phonograph record resurfacing machine having a rotatable record support; a toolcarriage: the combination of a reversible driving means forreciprocating said tool-carriage along said support; and one-way action means rotatably coupling said driving means with said record support to cause rotation of said support only during one half cycle of each tool-carriage reciprocation.

11. In a phonograph record resurfacing machine having a record support: the combination of a tool carriage; driving means for reciprocating said carriage along said support; and power operated means, controlled by said carriage, for causing a pause in the carriage movement at the completion of the first half cycle of each carriage reciprocation.

12. In a phonograph record resurfacing machine having a record support and a carriage resurfacing means on said carriage settable into operative position relative to a record on said support: the combination of driving means for reciprocating said carriage relative to said support; means for causing a pause in the movementof the carriage at the completion of the rst` half cycle of each carriage reciprocation; and means, controlled in predetermined relation to said last-mentioned means, for setting said resurfacing means into operative position within the time interval of said pause.

13. In a phonograph record resurfacing machine having a record support: the combination of a tool-carriage movable back and forth along said support; feeding means for said carriage normally operatively connected therewith; means, rendered operative when said carriage is fed into the end portion of its travel, for rendering said carria-ge disconnected from its feeding means for a predetermined time interval; and means, responsive to said last mentioned means subsequent to said time interval, for reversing said feeding means to cause a return feed of said carriage.

14. In a phonograph record resurfacing machine having a record support and a carriage and a resurfacing tool on said carriage settable into operative position relative to a record on said support: the combination of reversible driving means for feeding said carriage back and forth relative to said support; means, controlled by said carriage, for rendering said driving means inoperative to feed the carriage and for setting said tool into operative position; and means, operated by said driving means subsequent to the setting of said tool, for rendering said driving means operative to feed the carriage and for reversing the same.

15. The structure as claimed in claiml 14, further including means operatively connecting said driving means with: said record support for causing rotation of said support during the half cycle of carriage reciprocation subsequent to said pause.

16. In a phonograph record resurfacing machine having a record support and atool-carriage: the combination of reciprocating means normally operatively connected with said tool-carriage for advancing and returning the tool-carriage along said record support; cammeans moved in one direction by said reciprocating means at the completion of the advance ofthe tool-carriage and returned'in the other direction during the initial return of the tool-carriage; means operated by said cam means in its movement in said one direction, for temporarilyl disconnecting said reciprocating means from said tool-carriage ;1 and means,

associated with: said,- cam` means, for rendering direction.

, 17. In a-phon'ograph record resurfacing machine having ;a record support: the combination of a tool-carriage; driving means for feeding said tool-carriage along said .record support in ,and against `a direction of normal record-resurfaclngmovement; manipulatable means for controlling the direction of feed of said carriage; and means, associated with -said tool-carriage, for preventing manual. operation of Isaid .manipulatable means. While the carriage. is progressing through its record-resurfacing movement.

18..In a phonograph recordresurfacing machine havinga recordsupportathe combination of a tool-carriage; kdriving means placeable into operation to produce one cycle of reciprocative movement of said tool-carriage across said support; manipulative means for rendering said driving means operative to produce the cycle of carriage movement; and. means, -controlled by said carriage, for rendering said `manipulative means inaccessible.A for-*operation While said carriage is progressing through the major part of its cycle of movement.

19. In a phonograph record resurfacing machine having a record support: the combination of a tool-carriage; driving means for feeding said tool carriage along said record support from and towards a start position; manipulatable means for controlling said driving means; and means. associated with said tool-carriage, for rendering said manipulative means ineiective While the carriage is out of start position.

20. In a phonograph record resurfacing machine having a rotatable record support, a brake for restraining said record support against rotation and a tool-carriage: the combination of driving means for reciprocating said tool-carriage across said support; and means, operated by said driving means at the completion of one half cycle of each carriage reciprocation, for rendering said brake inoperative and subsequently causing said record support to be set into rotation.

21. The structure as claimed in claim 20, further including means, responsive to the terminal movement of the carriage at the completionv of each cycle of its reciprocation, for rendering said brake operative and coordinately rendering said driving means inoperative.

22. In a phonograph record resurfacing machine having a rotatable record support: the combination of a tool-carriage; driving means for rotating said record support and concurrently imparting a record-resurfacing movement to said tool-carriage; and means, controlled by said toolcarriage, for braking the rotation of said support and coordinately stopping said driving means at the completion of the record-resurfacing movement of said carriage.

23. In a phonograph record resurfacing machine having a rotatable record support, a toolcarriage and driving means for rotating said record support and concurrently imparting a record-resurfacing movement to said too-l-carriage: the combination of means, operated incidental to the completion of the record-resurfacing movement of said tool-carriage, for braking the rotation of said record support; and means, operated by said braking means, for stopping said driving means.

24. In a phonograph record resurfacing m'achiney having a, record support and means for rotating said rs upportzj the combination of control means for said rotating means; means for braking- V the. rotation of said support; and springmeans for operating said brakingmeans and coordinately operating-said control means to render lsaid rotating means inoperative.

25. In la{,}; honograph record resurfacing machinehaving a rotatable record support and a brake for retarding the rotation of said support: the combination of la tool-carriage; driving means for vreciprocating said tool-carriage across said record support; means, operated at the completion -of..the,iirsthalf cycle of each tool-carriage reciprocation, lfor rendering said brake inoperative and for causing said record support tobe coupled Withsaiddriving means to place saidsupport. inrotation; and means, responsive to the-movementof.y the tool-carriage at the completion of each reciprocation thereof, for render- I ing saidbrake operative and said driving means inop erative..- i

26, IThestructureas claimed in claim 25, further including manipulative means, operable at the completion-.ofone cycle of tool-carriage reciprocation;forrestartingsaid driving means to cause said tool-carriage to be moved through another cycle of its reciprocative movement.

27. In a phonograph record resurfacing machine having a rotatable record support, braking means for said support and a resurfacing tool settable into operative position relative to a` record on said support: the combination of driving means reversible to feed said carriage back and forth along said support; means controlled by said carriage in response to a feeding movement of the carriage in one of its movable directions, for setting said tool into operative positionL rendering said braking means inoperative, and reversing said driving means to feed the carriage in the other of its movable directions; and means, rendered effective upon the reversal of said driving means, for causing rotation of said record support during the feeding of said carriage in said other direction.

28. In a phonograph record resurfacing machine having a record support and a tool-carriage: the combination of feeding means for advancing said tool-carriage along said support comprising a motor having a main circuit; means selectively operable to reverse the direction of rotation of said motor to cause a return of said tool-carriage; and means, included in said circuit as an incident to the reversal of said motor, for -controlling the rate of the return of said toolcarriage.

29. In a phonograph record resurfacing machine having a record support and a tool-carriage: the combination of feeding means for advancing said tool-carriage along said supportv comprising a motor having a main circuit; means selectively operable to reverse the direction of rotation of said motor to cause a return feed of said tool-carriage; and switch means, included in said circuit as an incident toy the reversal of said motor, for stopping the return feed of said tool-carriage.

30. In a phonograph record resurfacing machine having a record support and a tool-carriage: the combination of feeding means for advancing said tool-carriage along said support comprising a motor having a field and an armature; a main circuit for supplying power tosaid motor; a reversing circuit connectable into said main circuit to reverse the polarity of said field with respect to said armature so as to reverse the direction of feed of said tool-carriage; and switch means in said reversing circuit, operated incidental to the reverse feed of said tool-carriage, for stopping said feeding mans.

fsaid field with respect to said armature so as to reverse the direction of feed of said tool-carriage; and switch means in said reversing circuit, operated incidental to the reverse feed of said toolcarriage, for opening said reversing circuit to stop 1 said feeding means. i

32. In a phonograph record resurfacing machine having a movable tool-carriage: the combination of feeding means forsaid tool-carriage normally operatively connected therewith; means .'for disconnetcing said tool-carriage from said feeding means; and means, rendered effective upon the disconnection of said tool-carriage from said feeding means, for locking the tool-carriage.

33. In a phonograph record resurfacing machine having a rotatable mandrel for supporting a record to be resurfaced; and an endgate for said mandrel: the combination of a latch for said endgate; driving means for the machine placeable into operative and inoperative conditions; and means, controlled by said latch, for placing said driving means into operative condition.

34. In a phonograph record resurfacing machine: the combination of a rotatable support for a record to be resurfaced; a resurfacing tool settable into operative position relative to a record on said support; a carriage for said tool movable in a direction operative to cause a resurfacing of a record on said support by said tool; power means placeable into operation to set said tool and to subsequently rotate said record support and impart a record resurfacing movement to said carriage; and means, operated as an incident to the completion of a mounting of a record on the machine, for placing said power means into operation to cause a resurfacing of the mounted record.

RICHARD M. SOMERS.

CERTIFICATE OF`CORRECTION.

Patent No.' 2,209,855. July 5o, 191m.-

RICHARD M. soMERs.

It is hereby certified that.l error appears in the vprinted specification of the above numbered patent requiring correction as follows: Page 9,l first column, line 60, for "enaggement" read --engagement; line '275, for "inital" read --initial; and second column, line 19., for "is" read it; line 22,

for "at at" read --as' at.; page l2,- second column, line l, claim l0, for "support;" read "support and; line 19, l claim l2, before "resurfacing" insert and; page 1h., first column, line 5, claim 50, for "'mans" read -means; line 25, claim 52, for disconneteing" read --disconnecting--g and that the said Letters Patent shouldbe read with this correction therein that the same may conform to the record of the case inthe Patent Office.

Signed and sealed this l2th day of November, A. D. l9).|..

Henry Van Ar sdale (Seal) Acting Commissioner of Patents.

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