US1467517A

US1467517A - Polishing machine

Info

Publication number: US1467517A
Application number: US125035A
Authority: US
Inventors: Taylor William
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-10-11
Filing date: 1916-10-11
Publication date: 1923-09-11
Anticipated expiration: 1940-09-11

Description

Sept. 11, 1923.

- W. TAYLOR POLISHING MACHINE 1916 5 Sheets-Sheet 1 Filed Oct. 11,

W. TAYLOR POLISHING MACHINE Sept. 11, 1923. 1.467.511

Filed Oct. 11', 1916 5 Sheets-Sheet 2 Inventor:

Se t. 11, 1923.

W. TAYLOR POLISHING MACHINE Filed Oct. 11, 1916 5 Sheets-Sheet 3 Sept. 11; 1923. M7517 W. TAYLOR POLISHING MACHINE Filed Oct. 11, 1916 5 Sheets-Sheet 5 Patented Sept. 11, 1923.

UNITED STATES WILLIAM TAYLOR, 0F LEICESTER, ENGLAND.

POLISHING MACHINE.

Application filed October 11, 1916. Serial N0."125, 035.

To all whom it may concern."

Be it known that I, WILLIAM TAYLOR, a citizen of Great Britain, residing at Leicester, in the county of Leicestershire, England, have invented certain new and useful Im provements in Polishing Machines, fully described and represented in the following specification and the accompanying drawg ings, forming a part of the same.

My invention relates to polishing machinery, and more especially to machines for polishing glass, particularly high grade lenses, for which purpose polishers aregenerally madeof pitch or wax and areused with abrasives such as rouge. The object of the invention is, generally, to provide a machineby which the desired polishing operations may be carried out with a high degree of accuracy and in considerably less time than heretofore required andwith a minimum of skilled attention. v

It is important for the production,.in the shortest timewit-h a minimum of skilled 'attention, of the best classes of lenses andthe like that the rubbing together of the polisher and the work shall take place at a. substantially uniform velocity, with no sudden changes of direction and with no staggering or vibration, and that the polisher and the work shall be pressed together with a substantially uniform and constant pressure suitable to each case, and that the rubbing shall be substantially uniformly distributed.

The presentinvention aims to provide a machine which meets these requirements, and the invention comprises features of construction whereby such aim is realized, and other features contributing to convenience of operation and adjustment and general adaptability of the machine to perform the required operations.

A machine embodying all the features of my invention comprises a number of separately adjustable and separately controlled similarly constructed polishing units mounted upon a single base or bench, which units may be adjusted independently, longitudinally of such bench or'base, in order that the several polishing units may be spaced apart from one another at distances suitable to'the size of the work on which eachoperates, and yet may be grouped in such manner that they may be arranged as compactly as pos sible to be under the notice of-the operators. The several units when so spaced apart may each be clampedindependently in the desired position on the said bench or base.

The .invention also includes improved means for applying abrasive to the-"work, and for controlling the temperature of the work and polisher. V

v A full understanding of the invention can best be :given byadetailed description of a complete organized machine embodying the various features of the inventionin'the scription will-now be-given inuconnection with the accompanying drawings showing such-an approved embodiment ofthe invennon.

Fig. 'li's anend elevation of a lens polish ing machine embodying my invention,-showform now considered best, and 'suchfa deing one of: the polishing units adjustably mounted upon the bench or stand, a portion of the po'llshing unit and the longitudinal channel beams or ways of the base being shown invertical section.

Fig. 1Fshowsa1fragmentary vertical sectlOILOft-he retaining collar 15 and associated parts.

Fig. 1 is a bottom plan view of the retaining collar 15.

Fig. 2 is a side elevation of the 'jointed polishing arms and associated parts by which motion is conveyed tothe polisher (the latter not being shown in this figure) a portion of the spring mechanism by which pressure is applied to the work being shown in central vertical section.

Fig. 3 is a top view of the parts shown in Fig. 2. v v

v Fig. 8 shows, on a larger scale than Fig. 3, a horizontal section of the hinge

joint connecting arms

32 and 33.

Fig. 3 isa section on line 3 3 of Fig; 3?.

Fig. it shows a front view of a'polishing unit such as shown in the previous figures, and of a portion of the benchupon which the same is mounted, such bench being broken away in part. T I

Fig. 5 is a detail'side view of the toggle elt-tightening mechanism and associated parts; and I.

ig. 6 is a top view of the same parts; a

portion of the supporting frame ofthe polone ofthe abrasive-applying apparatus. I

units are adjustably mounted.

Fig. 9 is a top view of a portion of a complete machine showing a part of the bench or stand and a plurality of polishing units mounted thereon.

Fig. 10 is a side view of the receptacle 45 showing side-plate 46 in sect-ion.

Fig. 11 is a side view of the receptacle '45 with the side-plate 46 removed.

Fig. 12 is a sectional view of the receptacle 45. 7 I v I 1 1 Referring first to Figs. 1 to 4, the several polishing units of the machine shown and other-operating parts are supported by a bench or stand which comprises standards 1 and longitudinal girders, channel members or

ways

2 and 2 on which the polishing The bench is provided with bearings 3 for a longitudinal line shaft 4. which may be driven from suitable source of power and which is provided with a driving pulley 5 for each polishing unit.

The bench is provided with a longitudinal gutter 6 (see Fig. 1) into which waste water and abrasive from troughs only one of which is shown) associated with the polishing units is conveyed by a pipe or pipes 8. One such trough may be provided ,surrounding each work'spindle or each group of work spindles. I

Each polishing machine unit comprises a frame-member or base-member 9, having bearings fora work spindle 10 and a crank spindle 11, together with mechanism,.including hinge-connected arms or rods hereinafter described, for imparting motion to the polisher, and means for driving the work spindle and crank spindle, and for starting and stopping said spindles as desired. The frame member 9 of each such polishing machine unit has

lugs

9 and 9 normally resting upon the

longitudinal girders

2 and 2 respectively of the bench; clamping means, comprising screw-held dogs, 9 and 9, being provided for adjusta-bly clamping the frame member to said girders.

The work spindle 10 and the crank spindle 11 are mounted in

bearings

9 and 9 respectively of said frame 9. The crank spindle llis provided with a belt pulley 12 arranged to be driven from belt pulley 5 on the driving shaft 4 by a belt 5 passing over guide and tightening pulleys 13 and 14, both of which are adjustable as hereinafter described. For varying the speed of each polishing unit, I commonly provide for each such unit a plurality of belt pulleys 12 of different sizes; each such belt pulley being readily removable, as by being formed with a key-way to engage a feather on the spindle 11 and being held on the spindle by means of a counterbored and radi'allyslotted collar 15 (Figs. 1 and 1 normally engaging a groove in spindle 11, but which is readily removable, and the removal of which perany position to which it is adjusted, it is made so as to be capable of slight rotation in its bearings, and is provided with an arm 16 (Fig. 1) adapted to engage one or another of teeth 9 formed on the frame member 9. The weight of the belt pulley 13, and

the pull of'belt 5, normally hold the arm 16 in engagement with that tooth 9 with which it has been engaged. Belt pulley 13 is mounted'in a fork 13? having a swivel connection to the vertical end 'of the bar 16.

so thatthe pulley 13 may assume any proper position required for free running of the belt 5. I I

Belt pulley 14 is arranged to be moved so as to slacken or tighten the belt 5 for stopping orstarting the corresponding polishing unit. The mechanism by whioh this belt pulley maybe moved is shown particularly in Figs. 5 and 6. As there shown, the

belt pulley 14 is mounted in a fork 14 havinga swivelconnection with a link '17 pivoted to frame 9 at 18, andconnected by a toggle mechanism 19-20 to a shift rod2l,

I which latter extends to the front of the machine in a position convenient for actuation by the operator (seeFigs. 1 and 4).

Links

19 and 20 of the toggl'e'mechanism, and shift bar 21, have a common junction pivot 22. Link 19 is pivoted to the frame 9 at 23 (see also Fig. 1) and link 20 is pivoted to the link 17 at 24:. Link 20 has an opening'20 through which the pivot 23 passes, the size of this opening 20 limiting the motion of said pivot 23, i. e., limiting the throw of the toggle. When the shift rod 21 is pulled out the parts of the toggle are in the position shown in full lines in Figs. 5 and 6, in which position the toggle links 19 and 20 look over dead centers and set the pulley 14: in position to tighten the belt 5 and drive the machine; while when the shift rod 21 is pushed in, the parts assume the position shownin dotted lines in Fig. 5, the belt '5 being slackened so as to fall free of the drive pulley 5 the polishing unit arranged to be The polishing of the surface of the lenses or other work is accomplished by the coaction of two polishing members or tools, one of which is the work holder to which the lens or lenses or other work to be polished is secured, and the other of which is the polisher, and one of which is given a rotary movement by being mounted on the spindle 10, which has been called the work spindle, and the other of which is given a bodily movement which should be a movement of revolution in a path or orbit which is substantially circular in plan or in the general or average plane of the rotating member. For polishing lenses, one of the polishing members or tools will have a convex surface and the other a corresponding concave surface according to the degree of curvature of the lens or lenses to be polished. Usually the convex member would be carried by the work spindle 10, and as shown the member 25 carried by the spindle 10 is the work holder and is shown in Fig. 1 as carrying a plurality of lenses L, the lenses being secured to the holder in any suitable manner, as by being suitably cemented thereto. The work holder 25 is mounted on the spindle 10 by means of a screw socket piece 10*. The bearing member 9 for the spindle 10 passes through an opening in the trough 7, which opening in order to avoid the necessity of a tight fit between the bearing. member and the trough is guarded by an upwardly extending collar 7*, and a shield 10 is provided to guard the top of the collar 7 against liquid which might otherwise enter the collar and gain access to the spindle bearing.

The upper concave polishing member or tool 26 as shown in the drawings is the polisher. It may, in the usual manner, be formed of, or have a working surface of, a suitable pitch or wax, and is pressed against the work and receives its motion from a finger 27 having a ball point which rests in a corresponding socket 26 in the polisher. The finger 27 is moved in a path which should be substantially circular in plan or in the general plane of the surface being polished, by means of a crank pin 28 carried by the crank spindle 11 operating through the means which will now be described.

The crank pin 28 is carried by a crank disk 29 fixed on the spindle l1 and slotted, as shown particularly in Figs. 2, 3and '9, for adjustable support of the crank pin, the crank pin being adjustable in the slot of the crank disk for variation of its throw according to a scale of graduations marked on the disk as'shown in Figs. 3 and9. The crank pin is shown in solid lines in its central or inoperative position in the drawings, but for operation it is, as will be understood,

moved outward to the proper position in its slot. One of the. crank pins and the parts.

moved thereby are shown in an operative to which it is adjusted by a bolt 30 and hand nut 31. This crank pingives motion to a jointed

structure comprising arms

32 and 33 hinged together on a horizontal axis at 34 topermit up and down movement of the arm 33. The arm 32 is connected to the crank pin 28 by means of a hub 32?, andthe arm 33 carrier the ball-pointed finger 27, such finger being adjustably secured by means of a clamping screw 35 in a bar 35 so that it may be adjusted according to-the thickness of the work and of the polishing member or tools, and the bar 35 'is adjustable with respect to the arm 33 and secured by a clamping screw 33 so as to vary the eccentricity of the circular orbit of the member 26 with respect to the spindle 10. The bar 35 is most desirably graduated and figured to indicate the eccentricity of the orbit of the finger 27with respectto the spindle 10.

The structure. formed by the hinge-connected

arms

32 and 33 is constrained in its movement so that when the. structure is driven by the crank 28 the finger 27 will have a substantially circular movement for operating the polishing member 26, which will thus be given a movement which is of substantially uniform velocity and without sudden change of direction. In order to compel the finger 2'7] to follow a substantially circular path, .a point 32 of the arm 32 which is approximately midway between the crank 28 and the finger 27 is constrained to move approximately in the plane of the axes of the

spindles

10 and 11 by means of a pivoted arm 36 to which the arm 32 is pivotally connected at the point 32* and which also serves as a support for the structure 32-33, and which is pivotally. connected to an offset or arm of the frame 9 by means of a pivot 37 so located that the arm 36 extends normally atright angles to the structure or arms 32-33. The arm 36 should most desirably be of a lengthbetween cen ters at least twice the maximum useful throw of the crank 28. As shown in Fig. 4: the arm 36 is dropped at point 36 so that the lower outer portion of the arm 36 of any one polishing unit may lie beneath the arm 32 and upper. inner-portionof the arm- 36 of another polishing unit nextto the left as the complete machine appears in Fig. 9, in which figure the polishing units are so ar-i ranged. This permits very close grouping of the polishing units.

1 The hinged connection of the arm 33 to arm 32 permits the polisher, and with itthe' tools as may be required from time to time. In order to provide a uniform and constant pressure of the finger 27 on the upper polishing member 26, which may be varied or adjusted as desired, a spring-actuated plunger 38 is provided carried by an arm 39 pivoted on a stud on the arm 32 andbearing upon an arc 33 forming an extension of the arm 33, the plunger spring most desirably having a'large initial set so that through its normal range of action its strength varies but little. By turning the arm 39 to move the plunger over such are, toward 'or from the axis of the hinge 34, the pressure exerted by the plunger through the arm 33 and finger 27 on the member or tool 26 may be varied; the pressure being greatest when the arm 39 is substantially parallel with arm 33, and being less as the plunger is moved toward the axis of the hinge 34, but being in every such position substantially uniform throughout the range of spring action. The pressure which will be exerted on the member or tool 26 for various positions of the arm is conveniently indicated by a scale on the are 33". By swinging the arm' 39 backward so that the plunger bears on the tail portion of the arc 33 to the rear of the hinge axis the pressure'of the plunger 38 may be made to raise the arm 33 and lift the finger 27 out of contact with the tool 26. A stop 39 (Fig. 2) on the arm 39 is adapted to engage an abutment 33 (Fig. 3) on arm 33 and thereby to limit the rearward motion of arm 39 and plunger 38.

Heretofore weights have been used to give the required pressure on the polishing member; but I find that the desired uniform pressure is promoted by using the spring pressure exerting means above described for pressing down the arm 33, and reducing the weight and inertia of the parts which move up and down. Not only is uneven pressure and shock to the work practically avoided, but facility of adjustment also results. i

The graduated scales on the crank disk 29,

the finger bar 35 and the are 33 are conveniently used for setting the machine according to a schedue prepared for the operator.

' A lubricator 32 (Fig. 2) supplies lubri cant to the crank pin 28 and the pivot 32 through a duct 32 (Fig. 2) provided in o in connection with the'arm 32.

In order to secure durability and close fit at the hinge 34, with consequent freedom from lost motion at such hinge, I find it desirable to provide hardened steel center pieces 34* and 34 pressed into suitable holes in the horns of the arm 33, and to provide, in a suitable bore in the arm 32, correspond ing hardened steel center pins 32 pressed out against

such center pieces

34 and 34 by a compression spring 32 located in such bore.

' Suitable clamping screws 32* and 32 are provided for clamping the centers 32 tightly when they have been pressed against the

center pieces

34 and 34 by the spring 32 It is usual in polishing lensesto separate the polisher from thework at intervalsas it becomes dry, and apply abrasive and water with a brush. This is objectionable, and in my apparatus I dispense largely with the attention required for supplying the abrasive and make the operation practically automatic and secure better results by providing means for supplying a mixture of abrasive and water or other liquid to each polishing unit while the polishing members are in operation.v In the construction shown a device for spraying a mixture of abrasive and:

liquid is provided for each polishing unit. Each such devicecomprises a spray or jet nozzle or tip 41 (Figs. 1, Sand 9) mounted so that it may be adjusted to project its spray on the intermittently exposed portion of the work. Supply ducts 42 and 43 (Figs. 7 and 8) extending longitudinally along the bench, supply waterand air respectively to the several spraying devices, having branch connections at suitable intervals for that purpose. The air under pressure may be supplied from a suitablelow pressure blower or from any other convenient means affording a constant pressure. T hewater may also be supplied from a constant pressure supply means, as for example, from a cistern having suitable means formaintaining a constant level therein somewhat below that of the top of the vessel 45.v Air for each spraying device passes from thepipe 43 through a junction connection 43? anda crank pipe 44 which swivels in the junction 43 and carries at its upper end a vessel 45 containing water and abrasive. Attached to the side of the vessel 45, as by being screwed thereto as shown, is a side plate 46 which receives'the end of the pipe 44 and which has

ports

44 and 44 communicating with the pipe 44, flow throughthese ports being controlled by

adjustable screw valves

44 and 44 respectively. Port 44 communicates through a rubber pipe 44 with the air pipe 41 leading to the spray nozzle 41. This pip'e'41 serves to support the spray nozzle 41, since it passes through a hub 47 pivoted between lugs on the lid 48 of vessel 45, a spring 49 and fiber washer 50 giving sutiicient friction to support the pipe andspray nozzle'41, but permitting of the nozzle being raised or lowered as may be required to suit the work (see Figs. 7 and 8). The lid '48 has a circular bung to center it in the vessel 45 so that by rotating the lid 48 in the vessel and by swinging the crank pipe 44, the spray nozzle may be moved about horizontallyto direct its stream properly 0n the work.

Rouge or other abrasive is placed in the vessel 45, either directly in the water or in a suitable container to serve as a strainer, which container is conveniently formed-by a small bag 51 of muslin or other suitable material which may rest on the bottom of the vessel 45. 'Water is conveyed from the pipe42 to the vessel 45 through a flexible pipe 52, communicating with the upper end of a port 53 formed in the side of the vessel 45 and covered by the side plate 46. The port 53 has a hole or outlet 54 by which water passes into the vessel 45. The object of thus delivering the water to the top of a vertical passage outside the vessel is to prevent the rouge'or other abrasive from falling back into and choking the water pipe.

The airport A 'is similarly carried upward within the side plate 46' and downward again to a hole or port 55 by which a small quantity of air controlled by the valve 44 is allowed to blow into the lower part of the vessel 45 so as to bubble upward through the liquid and agitate the liquid and the abrasive and keep suflicient of the abrasive in suspension in the water to be carried with the water to the spray nozzle.

A flexible pipe 56 passing through the lid 48 extends down into the liquid in the vessel and connects to the spray nozzle 41, so that by the air supplied to the nozzle through the pipe 41* the mixture of liquid and abrasive will'be drawn from the. receptacle through the pipe 56 and discharged as a spray from the nozzle. 1

In former lens polishing machines mechanism has usually been provided whereby the ratio of crank spindle speed to work spindle speed may be varied. I have found that this is objectionable and a source of great confusion. The function of the work spindle rotation, 01 rotation of 'the lower member or tool, is primarily to distribute the rubbing, while the function of the motion derived from the crank spindle is-todo the rubbing. For the performance of these functions, variation'of the relation between the rates of rotation of the upper andlower member is not required, and is a source of confusion. I have found that a fixed ratio of about three rotations of the lower member to five revolutions of the upper member is generally suflicient.

WVhile the term polishing has been used herein inre ferring to the invention and the particular embodiment thereof shown, and while the invention, including the water and abrasive spray, is especially adapted for use in machines intended for the final finest grinding, or polishing, of the surfaces of lenses and the smooth grinding, or smoothing, of the surfaces of lenses, the invention is not confined to such smoothing and polishing, but includes, '01- maybe embodied in, apparatus for, performing rela tively coarser degrees of grinding of surfaces, and the term polishing .as used in 7 which tends to soften the wax or other materialof th'epolishe'rthe hardness ofwhich also varies with change in the season according to the temperature of the room in which the work i done. .The spraying device of the present invention is of considerable advantage in securingthe maintenance of a more uniform temperature of the work and tools than has been heretofore generally attainable. As the temperature of the air and also the liquid is reduced as it issues from the spray nozzle, ,the temperature of the work and tools maybe varied by varying the pressure'of the air and the amount thereof blown onthe work, and also by regulating the initial temperature of the air used in the spray device heating or cooling it by suitable means.

What is claimed is: v

1. In a polishing-machine having a work holding member and a polishing member and means for rotating one of said members, means for moving the other of said members in asubstantially circular orbit,-comprising in combination an arm carrying at one end adevice adapted to engage andmo-ve said member, means for imparting a' circular movement to theother end'of said arm, and

means for constraininga point of said arm substantially {Il'llClWZLY between ltS' ends to movement substantlally in a plane including the axis of saidcircular movement and, in- I tersecting the member which is rotated.

'2. A polishing machine, comprising in combination a work-holding member and a polishing member, means for rotating one of means for constraining the movement of said structure, wherebysaid engaglng device is caused to move in a substantially circular'path, Sflld constrainingmeans comprising a linkconsiderably greater in length 1 than the diameter of said circular movement and mounted to oscillate about a fixed pivot at one end thereof and pivotally connected at its other end to said operating 7 structure at a point'midway between the ends ofthestructure. I I

saidmember, at one of its ends, means for giving the other end of said arm a circular movement, said arm being rigid in the plane of said circular movement, and restraining means pivotally attached to the center point of said arm capable of longitudinal movement substantially in the plane common to the axes of said circular movement and said rotary member. I

4:. A polishiing machine, comprising in combination a work-holding member and a polishing member, and means for moving one of'said members in a substantially circular orbit, such means comprising an operating member rigid in the plane of said circular orbit, a crank disk, means for rotating the crank disk, a crank pin connected to one end of said operating member and adjustably mounted on said crank disk for variation of its throw, an engaging device carried by the other end of said operating member, and a constraining member by which the operating member, at av point midway between and in the planecommon to the axes of the crank pin and the engaging device is caused to move substantially in a plane including the axis of the crank disk and intersecting the other of said members.

5. A polishing machine, comprising in combination a work-holding member and a polishing member, and means comprising a hinged arm for moving one of said members relatively to the other in a path of predetermined character, loading means for exerting pressure between the polisher and the workcomprising a spring exerting pressure on said arm and having an initial set, and means for varying the radial distance from the hinge axis at which the spring acts on the arm to vary the pressure between the polisher and the work.

6. A polishing machine, comprising in combination a work-holding member and a polishing member, and means for moving one of said members relatively to the other comprising a hinged arm carrying means to engage such movabl member, a supporting member to which saidarm is hinged, means "for imparting to said supporting member motion of a predetermined character, and loading means for exerting pressure between the polisher and the work comprising a spring having an initial set and tending to turn said-hinged arm "about its hinged axis, and means for varying the turning moment on said arm by varying the distance from the hinge axis at which the spring acts.

7. A polishing machine, comprising in combination a work-holdmg-member and a on said hinged arm in the direction of motion permitted by its hinge-connection, an are carried by said arm and on which said spring-actuated member bears, and a swinging arm mounted on said supporting member and by which said spring-actuated member is carried, said swinging arm being arranged to permit said spring-actuated member to be moved along said are to vary the radial distance from the hinge axis at which the spring-actuated member acts on the areprovided hinged arm.

8. A polishing machine comprising in combination a work-ho1ding member and a polishing member, and means for moving one of vsaid members about the other to effect the polishing, said means'comprising a hinged arm carrying means for engaging and moving such member, a supporting member to which said arm is hinged, means for imparting to said supporting member motion of a predetermined character, and loading means for exerting pressure between the polisher and the Work comprising a spring-actuated member carried by the supporting member and exerting pressure on said hinged arm in the direction of motion permitted by its hinged-connection, an are carried by said arm and on which said spring-actuated member bears, and a swinging arm mounted on said supportingmemher and by which said spring-actuated member is carried, said swinging arm being arranged to permit said spring-actuated memher to be moved along said are to vary the radial distance from the hinge axis at which the spring-actuated member acts on the arc-provided hinged arm, said are extending to the. rear of the hinge, whereby when said spring-actuated member is'moved to a position in rear of the'h-inge it tends to raise the hinged arm.

' 9. A polishing machine, comprising in combination two hinge-connected arms, means for supporting said arms and for giving them motion of a predetermined character, one of said arms having an arc,

and a swinging arm pivoted to the other of said two first mentioned arms and provided with spring-actuated means bearing on said are, whereby said springactuated means may be {moved long said are to vary the radial distance ifrom the. axis at which said spring-actuated means acts on the arc-provided arm.

10. A polishing machine, comprising in combination two hinge-connected arms, means for supporting said arms and for giving them motion of a predetermined character, one of said arms having an arc, spring-actuated means mounted on the other of said arms to bear on and swing over said are, whereby said spring-actuated means may be moved along said are to vary the radial distance from the axis of the hingeconnection at which said spring-actuated means acts, said are extending in rear of the axis of the hinge-connection whereby when said spring-actuated means is moved to the rear of the axis of the hinge-connection it tends to raise the arc-carrying arm.

11. A polishing machine, comprising in combination a work-holding member and a polishing member, means for rotating one of said members, and means for moving the other of said members in an orbit, said last mentioned means comprising a crank disk, a crank pin adjustable on the crank disk for varying the radius of such orbit, an operating finger moved by the crank and adapted to engage said member, a carrier for said finger adjustable to vary the eccentricity of said orbit relatively to the axis of the rotating member, and variable pressure means comprising a springactuated member tending to move said operating finger to exert pressure between the polishing member and the Work, said crank disk and said finger carrier and said variable pressure means being all graduated.

12. A polishing machine comprising in combination a work-holding member and a polishing member, an arm for operating one of said members, a crank pin for driving said arm, a pivoted constraining link pivotally connected to said arm to constrain the motion thereof, and a lubricant duct provided in connection with such arm and leading to the constraining pivot bearing and to the crank pin bearing of said arm 7 for the supply of lubricant to said bearings.

13. In a polishing machine such as described, the combination with the coacting work-holding and polishing members, of means for directing a jet of air against one of said members.

14. In a polishing machine such as described, the combination with the coacting work-holding and polishing members, of means for directing a jet of air against one of said members, and means for controlling said jet to maintain a desired temperature of the work and polisher.

15. A polishing machine, comprising in combination a work holding member and a polishing member, means for producing between said members a relative movement comprising a rotary movement abouta fixed axis anda movement in an orbit eccentric to the axis of said rotary movement, and means for adjustab'ly varying the eccentricity of said orbit, such means having graduations to'indicate' the distance fromvthe center of said orbit to the axis of said rotary movement. e

16. A polishing machine, comprising in combination a work holding member and a polishing member, means for producing between said members a relative movement comprising a rotary movement about a fixed axis and a movement in an orbit eccentric to the axis of said rotary movement, means for adjustably varying the eccentricity of said orbit including graduations to indicate the distance between the center of said orbit and the axis of said rotary movement, and means for adjustably varying the amplitude of said orbital movement including graduations for indicating such amplitude.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM TAYLOR. Witnesses:

DOROTHY Fos'rnn, ARTHUR Pmnon.