US2137383A - Record shaving machine - Google Patents

Description

Nov. 22, 1938. T c, BROWN I 2,137,383

" RECORD SHAV ING MACHINE Filed Sept. 17, 1937 2 Sheets-Sheet 1 m VENTOR Thomas C" Brown I} )1 TTORNE r Nov. 22, 1938. BROWN RECORD SHAVING MACHINE Filed Sept. 17, 1937 2 Sheets-Sheet 2 11v VENTOR Thomas C. Brown ATTORNEY thereto. knife to and looking it in an operative-or set po- Patented Nov. 22, 1938 UNITED STATES PATENT OFFICE RECORD SHAVING MACHINE Thomas 0..Br0wn, San Francisco, Calif., assignor 'to Thomas A. Edison, Incorporated, West 0range, NHL, a corporation of New Jersey Application September 17, 1937, Serial N0. 164,280

Claims.

My-inventionrelates to machines for shaving or resurfacing sound records, and more particupare them for the recording of additional mat- 'to provide the same with a, smoothsurface-suitable towbe recordedtupon. Therefore, the term f record as used herein contemplates a Wax or -:o-ther tablet having-a surface either adapted to receive andbearoralready bearinga sound track or recording.

The record resurfacing operationaas ordinarily performed, involves theuse of a machine having a. suitably mounted shaving knife which is adapted to traverse a rotatably mounted record-cylinder while held inoperative relation with respect Means are provided for :moving the sition within fixedu limits. so thatit will take a cut of desired -depthas the cylinder is rotated, and also forz-retracting the knife from operative positionaupon the unlocking thereof. In someof the shavingmachines which have herei tofore beenidisclosed, the adjusting of the knife to operative position and the lockingv thereof in such position are effected by a single actuation disadvantages inherent in theconstructions employed for moving the shaving knife to and locking the same in operative positionand for subsequently unlocking the knife and effecting the retraction thereof to inoperative position. One such disadvantage is thattthe. knife, when, secured in operative position, is urged orbiased towards the record cylinder by a, spring compristingwpartof the knife adjusting and controlling means and immediately upon; being. releasedv or unlockedymovesor-surges forward against the cylinder under the-action of such spring. This forward movement of the knife before its retraction from setor operative position is objectionable-in thatit is likely to resultinrgouging or mutilating the record cylinder andalso in damaging the knife itself.

It; is an object of the present invention to provide in a record shaving machine simple and improved knife adjusting and.- controlling means. which preferably-are effective to prevent-any forward movement of the knife from operative posi- -tion upon the release thereof when in suchposition.

Another object of the-invention is toprovide. in such a machine an improved construction for adjusting and controlling the shaving knife whereby the knife will be retained in operative position-until there is no effective forward bias thereon and means for. retracting, the,,knife bei comes effective.

Another object of the invention isto provide alshaving machine construction wherein the shaving knifeis normally biased toinoperative position and which includes means for preventing forward movement of the knifeluponthe release thereof when in operative position.

A further object of the invention-is. to provide an improved shaving machine construction .vvherebyoneormore of the above described results may be obtained and wherein a, single manipulation will effect theadjustment of theshaving knife to and the locking thereof. in operative position and preferably also wherein another single manipulation will effect the release of the knife and j the, retraction thereof. toinoperative ,position.

. Other objects rand-v features H of theinvention will hereinafter be more fully disclosed and claimed.

Inorder that the invention may be, more clearly understood, attention is directed to the ,accompanying drawings forming part, of this specificationand in which:

Figure 1 is aplan view of ,a, record resurfacing machine embodying an illustrative and preferred form of my invention;

Figure 2 is, a cross sectional view taken on line 22 of Figuretl;

Figure 3 isa fragmentary and elevational, view, partly in section, of the machine shown in Figure,1, with the,knife bar adjusted to and locked in operative position;

,Figure 4 is a fragmentary cross sectional View taken on line, 4-4 of Figure 3;, and

Figure is a view illustrating diagramatically the sequence and relationship of certain actions which take place upon movements of the actuating lever to effect the adjustment of the knife to operative position and the return thereof to inoperative position.

Referring to Figure 1 of the drawings, the form of shaving machine illustrated comprises a base plate I having left- hand standards 2 and 3, right- hand standards 4 and 5 and an interme diate standard 6. A conically pointed stud 'Isecured in the standard 2 engages a recess in the left end of a shaft 8, thus providing a thrust bearing for said shaft. The shaft 8 passes through an oversized hole 9 in the-standard 6 and a collar I I secured thereon prevents complete disengagement of the shaft from the stud I. Secured to the shaft 8 is a mandrel l2 onto which may be slid a sound recordA into frictional en gagement therewith, by virtue 'of the mandrel and the bore of the record being conplementarily tapered. The construction described retains the mandrel l2 in an approximate position only; to

maintain the same in proper position during rotation'thereof, a supporting means is provided which is removably associated with and adapted to engage the free end of the mandrel. This supporting means includes a swinging end-gate I3 carrying an adjustable conical stud I4 adapted to engage a recess in the adjacent end of the mandrel. The gate I3 is pivoted to a boss I5 on the base plate I and is closed, as illustrated in Figure I, by clockwise movement about its pivot until its forward extremity strikes against the right-hand extremity of a guide-rail I6, in which position it may be releasably held by a suitable latch I0. As this construction is well known in the art, being disclosed, for example, in the above mentioned Edison Patent No. 465,972, it is only conventionally illustrated herein. Sufflce it to say that when the gate I3 is moved to closed position, the mandrel I2 is wholly supported by the studs I and I4 for rotation about a fixed axis and without appreciable end play. When thus supported the mandrel I2 is in true parallel relation with the guide rail I6 and a record thereon may then be rotated for resurfacing. The driving means for rotating the mandrel I2 usually includes a motor (not shown) located within a cabinet for the base plate I and adapted to drive, by means of a belt I'I,,a pulley I8 secured to the shaft 8. To accommodate the .belt H a suitable slot is provided in the base boss-22 provided on a movable arm or carriage 23... The carriage 23 is slidably and tiltably mounted on a rod 24; the latter. being disposed behind and parallel to the mandrel shaft 8 and suitably secured to the standards 2 and 4. The

arm 23 is approximately semi-circular in side elevation and is provided with a smooth flat bottom surface (see Figure 2) at its forward extremity. A weight. 25, preferably formed integrally withthe arm 23, provides a convenient j handpiece normally maintaining the said bottom surface in contact with the top surface of --the guide rail I8.

g It .will be seen that by. this arrangement the arm 23 may be tilted so as to bring the. knife 28 to engaging or disengaging position with respect to the surface of the record cylinder A.

The carriage or arm 23, including its associated parts, is designed to traverse the record surface during rotation thereof. This is accomplished by providing a feed screw 21 parallel to the carriage rod 24 and journalled on standards 3 and 5. The feed screw 21 is rotated during rotation of the mandrel I2 by a belt 28 engaging a pulley 29 secured to said screw and a driving pulley 30 secured to the mandrel shaft 8. A feed nut 3| is arranged to engage the feed screw 21 when the arm 23 rests on the guide rail I6 and to disengage said feed screw when the arm is raised. The feed nut 3| is secured to the carriage 23 by a resilient extension 32 carried by a sleeve portion provided on the carriage. It will, therefore, be understood that when the knife is inoperative position and the mandrel I2 is rotated, the carriage 23 and hence the knife 26 will move steadily longitudinally of the cylinder from right to left, thus taking a uniform cut from the outer portion of the cylinder. For disposing of the shavings cut from the record cylinder there is provided a chip chute 33 leading to a suitable receptacle (not shown) Within the cabinet.

The construction described above is old in the art, the present invention, as hereinbefore indicated, being directed to improvements in the knife adjusting and controlling means. These improvements will now be described, reference being made to such prior art constructions as may be helpful to a clear understanding of the invention.

A problem to workers in this art has been so to adjust the record engaging tool or shaving knife as to obtain a proper depth of cut, i. e., a cut that is neither too deep nor too shallow. This requires that the knife be adjusted to proper ,lever or member in a reverse direction first effected the release of the knife and thereafter its retraction to inoperative position.

In such shaving machine constructions, however, the knife has been adjusted or moved to operative position by or through a setting spring and when locked in operative position was biased by such spring in a direction towards the record cylinder. Consequently, when the knife was unlocked, it took an undesirable forward movement or surge under the action of said setting spring prior to its retraction to inoperative position. To avoid this difficulty means should be provided to restrain the knife against the forward urge or bias of its setting spring until in the operations of unlocking the knife and returning it to inoperative position, the knife retracting means becomes effective to retract the knife. My invention provides an improved construction embodying such restraining means.

Referring to the drawings, the knife bar 2i is slidably mounted in an opening 35 which extends through the boss 22. The outer or upper end portion 36 of the knife bar is reduced in diameter and extends loosely through the top 31 of a hollow cap 38, upward or rearward movement of said cap with respect to the knife bar 2| being limited by-a* head 39' provided on the-=extremity of the knife bar. A coil spring 4] is disposed about the knife bar 2 I between'a collar 42 pinned to said bar and the topwall 31' 0f'cap 38. Rearward movement of the knife bar 2| is limited by the engagement of a collar-43,'secured-tothe forward end portion of the knifebar by a set screw 44, with the lower orforward end of the boss 22.

A guide rod 45 is slidably mounted in an-opening 46 which extends through'the boss 22, said opening being parallel to the opening'35 in which the knife bar is disposed. 'At its upper orrear "portion the rod 45 also extendsloosely through a sleeve 41 which is secured at one end within an enlargement of the opening 46 in-boss '22. The rod 45 is secured'at its upper or rear end to the top *3lof'cap38 by a'headed screw48 and therefore will partake of allmovements of said cap towards and away from the record support or mandrel I2. A coil spring 49 is disposed about the guide rod 45 between the topwall 31' of cap '38 and ashoulder formed on the inside of sleeve "41.

The function of spring 4| is to provide a resilient connection between theknife bar 2| and the cap38so that inbringing the knife bar to operative position (shown in Figure 3) by moving cap SB'forwardly, as hereinafter described, the knife 20 will not engage the record A with a hammer blow and make a deepgouge therein, but will be gradually and yieldingly pressed a short distance'into the material of the record. The adjustment of the knife bar in this manner automatically regulates the depth of the cut the shaving knife will take during the shaving operation. The principal function of spring 49 is to return the cap 38 and knife bar 2! to inoperative position (shown in Figure 2) when the knife bar looking means is released. To prevent the knife bar 2! from turning about its axis, an angular" guide piece 26 is secured by a screw 26' to the rear portion of boss 22 and extends through a slot 56 in the boss into engagement with a longitudinal groove 2| provided in the knife bar. To impart a neat appearance to the device, the skirt of cap 38 is preferably of such length as to cover or substantially cover springs 4| and'49 in all positions of the knife bar 2| and guide rod' 45.

A suitable construction is provided for locking the knife bar 2! in an operative position, which construction will now be described. The abovementioned slot 55 in boss 22 extends throughout the length of the boss and inwardly from the rear face of the latter to the knife bar opening 35, thus dividing the rear portion of the boss into bifurcated sections 56 and 56" (see Figure 4;). These bifurcated sections are slightly resilient and are adapted when forced towards each other to clamp the knife bar 2E firmly in fixed position with respect tothe boss. A cylindrical opening dd extends transversely of boss 22 through the bifurcated sections 56' and 56", and in this opening is disposed the reduced portion or shank of a clamping stud or member 5 I. This clamping stud also comprises an enlarged outer hub portion 53, terminating in a slotted head52, and a preferably integrally formed flange or collar 54 intermediate the said shank and hub portion. The flange 5 has a peripheral dwell or cutout 55 terminating in shoulders 55 and 55", and when the clamping stud and associated parts are properly assembled, the said flange is located closely adjacent one side of the boss 22, as shown in'Figure 4. The right hand end portion of opening 40 is enlarged and the cylindrical wall thereof is threaded; and *screweduinto said enlarged portion is a short sleeve or thimble 51 which isthreaded both; ex-

ternally and internally. The right-hand end portionof stud 5H is threaded and in engagement with'the internalthreads of sleeve 51. verse movement of clamping stud 5| with respect Transto boss 22 is -limited in one direction by engagement 'of thefla-nge 54with the adjacentside of said boss, and the limit of such movement may be regulated by adjustment of sleeve5l. The

sleeve 51 is adapted to be secured in any position of'adjustment by a knurled locking nut 58 which is threaded onto the outwardly projecting end portion thereof. An actuating lever 58 is loosely mounted for pivotal movement on the hub 53 of the clamping stud, and a pin-64 is fixed to this with provision made for a certain amount of lostmotion. This means preferably comprises a link 60 having an arcuate or gooseneok formation at one end portion and a longitudinally extending slot iii in the other end portion. The link Gil has -a pin and slot connection with cap 38 by virtue of its slot t! and a shoulder screw 62 which extends through said slot and is threaded into the cap, and at the end thereof remote from the slot EH is pivotally connected to the arm 59 of lever 50 by a shoulder screw 63.

The gooseneck at the forward end portion of link 69, enables the latter to remain clear of the hub of lever 50 in the swinging movements imparted to the link by the manipulations of lever 58 which effect the setting and'locking of the knife bar in operative position and the unlocking of said bar andthe retraction thereof to' inoperative position, as hereinafter'described. However,

the said gooseneck is adapted to engage the hub of lever 55 to limit the forward movement of said lever to a position in which the axis of its pivotal connection to link 60 is only slightly past dead center with respect to the axes of the-stud 5i and of the shoulder screwiifl. Therefore it will be apparent that when lever 58 is at the limit ofits P forward movement, with a record A on mandrel 62, such lever and also the link 663, cap 38 and guide rod will be releasably locked in the positions shown in Fig. 3 against the bias of spring 48, which is then under considerable compression.

When the machine is not operating the knife bar 2! and the movable parts associated therewith, comprising cap 38, rod d5, link til, lever and clamping stud 5 l, are normally in the respective positions shown in Fig.2, to which they are biased by the compression spring 59. The knife bar 2! is then in its most rearward or retracted position with the collar d3 engaging boss 22 and with the knife 20 in spaced inoperative relation to the record cylinder A; the clamping stud 5! is in such angular position that the bifurcated resilient portions 56 and of boss 22 are spaced so as to exert no clamping effect on bar 2i the pin 64 carried by lever5tl, engages or is adjacent the shoulder 55" at one end of the dwell 55 in flange v The construction just i '54; the end wall 31 of cap 38 engages the head 39 of bar 2|; and the shoulder screw 62 engages or is adjacent the outer or rear end wall of the slot 6| in link 60. Also lever 59 is then almost but not quite in engagement with a stop pin 50 carried by boss 22, which pin is provided for the purpose of limiting the movement of said lever in a clockwise direction under the action of spring 49.

When a record cylinder A is properly mounted on the mandrel I2 and the knife bar and parts associated therewith are in their normal inoperative positions, as shown in Fig. 2, all that is required in order to adjust the knife bar 2| to and lock it in operative position with respect to the record cylinder, is to swing or turn the lever 59 in an anti-clockwise direction from the position shown in Fig. 2 to the position shown in Fig. 3; and when the knife bar is locked in operative position with respect to the record cylinder A, as shown in Fig. 3, and it is desired to release or unlock the knife bar and effect the return or retraction thereof to its inoperative position, it

is merely necessary to swing lever 59 in a clockwise direction from the position shown. in Fig. 3. In turning lever 50 from the position shown in Fig. 2 to the position shown in Fig. 3, the cap 38 and knife bar 2| are moved forwardly without any change in their relative positions, by means of link 60, until the knife 20 engages the surface of cylinder A. Thereafter such turning movement of lever 50 causes forward movement of cap 38 with respect to the knife bar with resultant compression of the knife bar spring 4| and further compression of the already compressed spring 49, and consequently the knife 20 is forced under the yielding pressure exerted by said spring 4| into the material of cylinder A. During most of the last part of such turning movement of lever 5|], after the pin 64 has been brought into engagement with the end, or shoulder 55 of the dwell 55 in collar 54, the cap 38 continues to be moved forwardly, the springs 4| and 49 are further compressed, and the clamping stud 5| is turned so as finally to effect the locking of knife bar 2| in operative position. In the very last part of such anti-clockwise movement of lever 50, probably not amounting to more than 1 or 2 degrees, the axis of the pivotal connection between lever 50 and link 60 is moved slightly beyond a dead center position with respect to the axes of lever 50 and shoulder screw 62. and the gooseneck portion of the link is brought into engagement with the hub of lever 50 to thereby releasably lock said lever and associated parts in the positions shown in Fig. 3; but no further forward movement of cap 38 and no further compression of springs 4| and 49 are then effected.

Upon moving lever 50 in. a clockwise direction from the position shown in Fig. 3, the only result effected during the first one or two degrees of such movement is a slight movement of link 6!! in a clockwise direction about the shoulder screw 52 sufficient to carry the axis of pivot screw 63 past the dead center position referred to above and thereby release said lever, link and cap from the yieldingly locked positions in which they are shown in said Fig. 3. In the continued clockwise movement of lever 50, however. the cap 38 first moves upwardly under the action of spring 49 until the end wall 31 thereof engages the head 33 of the knife bar, during which t me the stud 5| remains in clamping position as the pin 64 of lever 50 then rides freely in the dwell 55 of clampin stud collar 54. The cap 38 and the knife bar 2| then remain stationary in the relative positions just described, while the link 60 is moved by lever 50 rearwardly with respect to cap 38, as is permitted by the slot 6| until pin 64 is brought into engagement with the end wall or shoulder 55" of the dwell 55 in the clamping stud collar 54. Thereupon the clamping stud is turned by lever 50 in a direction to effect the release or unlocking of the knife bar. As soon as the knife bar is thus unlocked the strong compression spring 49, if the lever 5|! be released, acts to move cap 38, knife bar 2|, link 69 and lever 50 quickly to the positions shown in Fig. 2. The action of spring 49 is so sudden and pronounced however, that the link 60 and lever 55 are likely to be moved beyond their normal inoperative positions so as to bring the lever 50 against the limit pin 58; such movement of the parts 50 and 60, which is advantageous because of the shock and strains to which these parts might otherwise be subjected to, being permitted by reason of the provision of slot 6| in the link.

For a still clearer understanding of the operation of the above described knife bar adjusting and. controlling mechanism, certain actions which take place in moving the actuating lever 59 from the position shown in Fig. 2 to that shown in Fig. 3 and in returning said lever from the latter position to the former, and the sequence in which such actions occur have been shown diagrammatically in 5, it being assumed that the record cylinder on the mandrel I2 is of maximum or nearly maximum thickness, that one from which none or but little of the material has been previously vshaven. In this figure the actuating lever 50 and its pin 64, the link 6|] and the collar 54 of clamping stud 5| are shown in the positions they normally occupy when the knife bar is in inoperative position, namely, the positions thereof. shown in Fig. 2. In the movement of lever 59 in a counterclockwise direction from the position thereof shown in Fig. 5, indicated by the dot-dash line B, to the position indicated by the dot-dash line C, wlnch is required to adjust the knife bar to and lock it in operative position, the following actions take place in the order or sequence indicated: as the said lever moves from the position B to the position indicated by the dot-dash line D, the knife bar is adjusted to record-engaging position without any compression of the knife bar spring 4| or any angular movement of the clamping stud 5| being effected; as the lever continues its movement from the position D to the position indicated by the dot-dash line E, the knife bar spring 4| is compressed to thereby force the knife 29 into the material of the record cylinder and the pin 64 of said lever is brought into engaaement with the end or shoulder 55 of the dwell. 55 in clamping stud collar 54: and in the final portion of such movement of the lever. that is, from the position E to the position C, the knife bar spring 4| is further compressed and the clamping stud 5| is turned by reason of the engagement of pin 64 with the shoulder 55 so as to effect the locking of the knife bar in operative position. In the reverse or clockwise movement of lever from the position C to the position B required to effect the unlocking of the knife bar and the return thereof to inoperative position, the following actions take place in the order described: as the lever moves from the position C to the position D the knife bar spring 4! is fully decompressed and the pin 64 of the lever is brought into en agement with the end or shoulder 55" of the dwell 55 in the clamping stud collar 54, the knife bar in the meantime remaining locked in operative position 2,137,383 as thepin 64 then travel freely in said dwell 55, and therefore. imparts no" angularjmovemerit to the clamping, stud 5i; and in the final portion? of such movement of lever 5l1, ,th'at is, from position D to position B, the clampingstud 51 ,by reason of the engagementof pin 64withthe sho'u1der' 55f is turned in a clockwise direction to effect-the unlocking of the knife bar. When the knife bar,

nism for adjusting said knife bar to and looking it in operative position with respect to a record on said support, said mechanism comprising, a knifebar actuating springiwhich'is compressed in the operation of adjusting the knife bar to operative position and means which with the knife bar locked in operative position is operable toeifect first the decompression of said spring andtherea after the releaseof the knife bar.

2. In a record shaving machine, a record sup.- port, a movably mounted knife bar, and mechanism for adjusting said knifebar to, andlocking itin operative position with respect to a record on said support, said mechanism-comprising a knife ban actuating spring which is compressed in the operation of adjusting the knife bar to operative position and means which with the knifebar locked in operative position is operable to effect sequentially the decompression of said spring, the

unlocking ofthe-knife bar and the retraction of the knifebar to inoperative position.

3. In a record shavingmachine, a record sup port, a movably mounted knife bar, and mechanism foradjusting said knife bar to and locking i it in operative position, with respect toa record on said "support, said mechanism comprising -a= spring through which there is imparted to the knife barthe movement required to adjust it to operative position and which is thereby compressed, and means whichwith-theknife bar locked in operative position is operable to effect the decompression of said spring and thereafter the unlocking'of the knifebar.

4. In a record shaving machine, a record support, a movably mounted knife bar, and-mechanism for adjusting-said knife bar to'and looking it; in operative position with respecttoaarecordon 1 said support and for unlocking the knife bar and;

retracting it to inoperative position, said mechanism comprising a spring, an actuating member and means which upon one actuationof the actuating member, effects movement of the knife bar to operative position through said spring, the compression of said spring and the-lockingof the knifebar in operative position: and which upon another actuation of the actuating member,

effects the decompression of said spring and" thereafter the unlockingof the knife bar and the retraction thereof to inoperative position. i

5. In. a-record shaving-machine, a record support, a movably mounted knife bar, and mechanism for adjusting said knife bar to and'locking it in operative position with respect-to alrecord on said support -said mechanism comprising an; ,,actuating member movable inopposite directions,

a spring and means which upon movement of the actuating. member in oneuirectionj effects movement of the knife" bar: to" operative positionthrough said" spring, the compression of said sprin'gjand the locking of the knife bar in operative position andfwhich upon movement of the actuating member in the opposite direction effects the decompression of said springand thereafter the unlocking of the knife ban.

6. Ina record shavingmachine, a record support, a movably mounted knife bar, and mechanism for adjusting said knife bar to and looking it in operativeposition with respect to a record on said support and forunlocking the knife bar and retracting itto inoperative position, said mechanism comprising an actuating lever, a spring and means whereby pivotal movement of said lever in, one direction eifects'movement of the knife bar to operative position through said spring, the compression -of said spring and the locking of the knife bar in operative position and whereby-pivotal movement of said lever in the op-- positedirection effects the decompression of said spring and thereafter the unlocking of the knife bar.

7. In a record shaving machine, a record support, a movably mounted knife bar, and mechanism for adjusting said knife bar to and looking it in operative position with respect to a record on said lsupport and for unlocking the knife bar and effecting the returnthereof to inoperative position, saidmechanism comprising a spring which is compressed in the operation of adjusting the knife bar to operative position and in-consequence exerts a' forward bias on the knife bar when the latter is in such position, means for retracting the knife barto inoperative position and meanswhereby forward movement of the knife bar from said, operative position under the bias of said spring is prevented when said retracting means is ineifecti've.

8. In arecord shaving imachine, a record sup-' port, a movably mounted knife bar normally biased to inoperative position with respect to a record on saighsupport, and mechanism for adjusting said knife bar to and looking it in operative position-with respect to such record and for unlockingthe knife and effecting the return thereof to inoperative position, said mechanism comprising means which when the knife bar is locked in operative 'positionexerts a forward bias onthe knife bar-and means for relieving the knife bar from-said-forward biasbefore said bar-is released in theoperation required to unlock the same.-

9.-In a recordshaving machine, arecord support, a -m-ovably mounted knife bar, and mechanismfor adjusting-said'knife'bar to and locking it in operativepositionwith respect to a record on said support and for unlocking the knife bar and effecting the return thereof to inoperative position, said mechanism comprising an actuat ing member movable in opposite directions, looking means for-the knifebar operable by said actuating member and having a 10st motion connection therewith, and means including a spring operableby said actuating member when the latter is moved in one'directionto effect movement of said bar to operative position, said spring being compressed in the operation'of moving the knife bar tooperative position, said last named means-being effective in the movement of said actuating, memberin the opposite direction ,to decompresssaid spring prior to i the releasing vpoi the knife Joar by said locking meansn 10. In a record shaving 1machine, a record support, a movably mounted knife bar, and mechanism for adjusting said knife bar to and looking it in operative position with respect to a record on said support and for unlocking the knife bar andreffecting the return thereof to inoperative position, said mechanism comprising an actuating member movable in opposite directions, means disposed between said actuating member and the knife bar including an element having a lost motion connection with the actuating member and a spring providing a resilient connection between said element and the knife bar, and clamping means for the knife bar having a lost motion connection with said actuating member.

1. In a record shaving machine, a record support, a movably mounted knife bar, and mechanism for moving said knife bar to and looking it in operative position with respect to a record on said support, said mechanism comprising an actuating member movable in opposite directions, a spring, and means including said spring interposed between said actuating member and knife bar and adapted upon movement of said member in one direction first to move said knife bar to record-engagingv position through said spring and to then compress said' spring and lock the knife bar in operative position, and

,..upon movement of said member in the opposite direction to effect first the decompression of said spring and thereafter, the unlocking of the knifebar and the return thereof to inoperative position. a

12. In a record shaving machine, a record support, a movablyrmounted knife bar,and mechanism for moving said knife barto and for, looking it in operative position with respect to a record on said support and for unlocking the,

knife bar and effecting the return thereof to in. operative position, said mechanism comprising an actuating lever, a reciprocal element, a link pivotally connected at itsends to said lever and reciprocal element respectively, the pivotal con-, nection at one end of said link being also a lost motion connection, a spring providing a yielding connection between said reciprocal element and the knife bar, and clamping means for the knife bar having a lost motion connection with said lever.

' l3. In a record shaving machine, a record sup- 7 port, a movably mounted knife bar, and mechanism for moving said knife bar to and looking it in operative positionwith respect to a record on said support and for unlocking the knife bar and effecting the return thereof to inoperative posithe arrangement being such that upon movement ofsaid lever to an extreme position in one direction the axis of the pivotal connection between the lever and said link will occupy a position which is past dead center with respect to the axes of the lever and of the pivotal connection between the link and said reciprocal member.

14. In a record shaving machine, a record support, a movably mounted knife bar, and mechanism for moving said knife, bar to and looking it in operative position with respect to a record port, a movably mounted knife bar, and mechanism for moving said knife bar to and looking it in operative position with respect to a record on said support, said mechanism comprising an actuating lever and means operatively connecting said lever and knife bar, said means including a link which is pivotally connected at one end to said lever and is also pivoted at its other end, the relative arrangement of said lever and connecting means being such that upon movement of the lever to a given position in one direction the axis of the pivotal connection between the lever and said link will be moved past dead center position with respect to the axis of the lever and the pivotal point of that end of the link which is remote from the end thereof connected to the lever.

16, In a record shaving machine, a record support, a movably mounted knife bar, means biased to a position in which it is adapted to maintain said knife bar in inoperative position with reand means operatively connecting said lever and knife bar, said connecting means including a link which is pivotally connected at one end with the lever and which is also pivoted at its other end, the relative arrangement of said lever and connecting means being such that upon movement of the lever to a given position in one direction the axis of the pivotal connection between the lever and said link will be moved past dead center position with respect to the axis of the lever and the pivotal point of that end of the link which is remote from the end thereof connected to the lever.

17. In a record shaving machine, a record support, a movably mounted knife bar, and mechanism for moving said knife bar to and locking it in operative position with respect to a record on said support, said mechanism comprising an actuating lever, a reciprocal element operatively associated with said knife bar to effect movement thereof, and a link pivotally connected at its ends to said lever and reciprocal element respectively, the relative arrangement of said lever, element and link being such that upon movement of the lever to a given position in one direction the axis of the pivotal connection between the lever and the link will be moved past dead center position with respect to the axis of the lever and the point of pivotal connection between the link and reciprocal element.

18. In a record shaving machine, a record support, a movably mounted knife bar, means biased to a condition for maintaining said knife bar in inoperative position with respect to a record on said support, and mechanism for adjusting said knife bar to and looking it in operative position with respect to such record, said mechanism comprising a spring through which there is imparted to the knife bar the movement required to adjust it to operative position and which is thereby compressed, and means which with the knife bar locked in operative position is operable to effect the decompression of said spring and thereafter the unlocking of the knife bar.

19. In a record shaving machine, a record support, a movably mounted knife bar, a movable member biased to a position in which it is adapted to maintain said knife bar in inoperative position with respect to a record on said support, and mechanism for'adjusting said knife bar to and locking'it in operative position with respect to such record, said mechanism comprising a knife bar actuating spring which is compressed in the operation of adjusting the knife bar to operative position and means which with the knife bar locked in operative position is operable 20. In a record shaving machine, a record support, a movably mounted knife bar, a reciprocal member cooperably associated with said knife bar, a compression spring biasing said reciprocal member to a position in which it is adapted to maintain said knife bar in inoperative position with respect to a record on said support, and mechanism for adjusting said knife bar to and looking it in operative position with respect to such record, said mechanism comprising a knife bar actuating spring which is compressed in the operation of adjusting the knife bar to operative position and means which with the knife bar locked in operative position is operable to effect first the decompression of said spring and thereafter the release of the knife bar.

THOMAS C. BROWN.

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