US1579056A - Grinding machine - Google Patents

Description

w. ARTER GRINDING MACHINE Flled sept e, 1921 ashe'ets-Sheet 1 March 30 1926.

Inventor.l

-Sheet 2 Inventar?v y8 She W ARTER GRINDING MACHINE Flled Sept 6 1921 March 30 1926.

March 30 1926.

W. ARTER GRINDING MACHINE Filed Spt. 6.

March 30 1926. 1,579,056

W. ARTER `GRINDING MACHINE Filed Sept. 6, 1921 l k8 Sheets-Sheet 4 v Inventor b y a@ March `30 `1926.` 1,579,056

W. ARTER GRINDING MACHINE Filed sept. e, 1921 sheets-sheet 5- b .y may March 3o 1926. 1,579,056

y w. ARTER GRINDING MACHINE Filed Sept. 6'; 1921 8 Sheets-Sheet 6 W. ARTER GRINDING MACHINE 8 Sheets-Sheet '7 March 30 1926.

w, ARTER. v GRINDINQ MACHINE 'Filed sept. e. 1921 e sheets-sheet a f r 4 fes/2%,

Patented Mar. 30.1926.

To all whom V may/concern.'

' f UNITED v"srprrlezs' PATENT orme-11.2"?.

WILLIAM .aIt'IEIal or WORCESTER, IIIAssncnusrz'rtrs.A

@BINDING MACHINE i f Applieatioa mea september' e, 192.1'. serial'm. 498,658.

Be it known that I, WILLIAM ARTER, a subject of the King of Great Britain, residing at lVorcester,l in the county of Worcester and State of Massachusetts, vhave lnvented certain new and useful Improvements 1n Grinding Machines, of whichthe followlng is a specification.

' This invention relates to grinding ma# Culty, and to this end a feature ofthe invention comprises improved actuating mechanism which will produce practically instantaneous movement of the necessary parts. A further object of the invention is to provide improved mechanism for' feeding the work to the 'grinding Wheel and discharging it after having been ground, thus rendering the machine entirely' automatic in its action. 4

To the accomplishment of these objects and others which will hereinafter appear 'and which will readily be understood by those skilled inthe art, the invention con prises the features and comblnations of parts hereinafter 'described and-then par- -ticularly pointed out in the appended claims.

`The invention is best illustrated in the accompanying drawings, in Which-v Figure 1 is a view in front elevation of a machine for automatically grinding piston rings 'and like articles; 1

Fig. 2 is a view in end elevation of -a por'- tion of the machine shown" in Fig.' 1;

Fig. 3 is a view, in plan, ofthe chuck and adjacentparts including the piston ring carrier;

Fig. 4 is a vertical, line 4 4 of Fig. 2;

' Fig. 5 is aslongitudinal, sectional view through the line 5-`5, of Fig. 4;

plate;

- nism are actuated by'oil pressure' Jectional View on the Fig is a view, in end elevation, of the aircylinder showing the cushioning valve 1n posltlon;

showing the cushioning valve in secl Fig. 6 is a viewof thel air cylinder, in

partial, longitudinal I section of the air cylinder showing the cushioning l valve and seating lug;

f Flg. is a'section through a pist-on loctitng rlng-i-n place on the rotating carrier Pa; Fig. 10 is a section'similar to Fig. 9 show- 1ng a replaceable piston locating ringA in position vto be .assembled with the carrier Fig.

anism;

Figs. 12 and 13 are views showing amodified form of `ring carrier indexing mechanism permittingnore than' one grind-l Ing operation on eac ring, Fig.A 12 being 'a horizontal 'section on Fig. 13;

mechanism, similar to that shown in' Figs.`

1 and 2 except that it is` mechanically operated from'. the recprocating whee1 head; Figs. 17. and 18 are a plan section, respectively, of a modified form of locating ring for' use `on the ring carrier;-

Fig. 19 is a view in elevation of portions of a machine in which the grinding wheel is a detail in plan,1and partly inl sectlon, of the rlng carrier'indexing ,mechthe line 12.-1'2 of Figs. 14, 15 and 16;Aare.elevational views of another modified ring carrier indexing' and diametric l i head and the ring carrier indexing Inechai In the embodiment of the invention il'. lustrated in the drawings is included a. well known type of grinding machine employing a magnetic chuck to hold and rotate the Work, and a reciprocatory head carrying a rotary grinding 'wheel which traverses the work held in the chuck.

Since the machine shown is designed particularly for facing piston rings, a magazine is provided to hold a quantity of the rings, and they are separated one at a time from the stack by a rotary ring carrier and transshown in Fig. i

los

ferred to a position over the chuck and benon-magnetic material, and having a. series neath the path of travel of the grinding wheel. An indexing mechanism for the carrier is employed which, in the form illustrated in Figs. 1 to 1 1, provides for only a single reciprocation of the grinding wheel across each piston ring after which it is carried awayfrom the wheel and'discharged. In the form illustrated in Figs. 12 -and 13 the indexing mechanism for the ring carrier is so designed that each ring may be caused to remain in the chuck for two reciprocations of the grinding wheel, or more than two, as may be required for the work in hand. Both of these mechanisms are illustrated a's being driven by Huid pressure but in the form of the invention illustrated in Figs. 14, 15 and 16 the indexing of the'ring carrier is effected' through mechanical devices actuated, as before, from the reciprocation of the grinding wheel head. The principle of operation is the same in each` form. In the form of the inventionsliown inv Figs. 19 and 20 the principle of operation also is the same except that a hydraulic drive is employed, controlled also by the reciprocation of the Wheell head.l Y

Having indicated the vprinciple upon which the illustrated machine operates, adetailed description of itsvarious features will now be given, it being understood that the main constructional features, suchA as the grinding wheel head and magnetic chuck with their power actuating mechanism and related parts of the construction, are fully disclosed inthe prior United States Letters Patent to White No. 1,184,905 dated May 30,

1916, and Arter No. 1,357,924 dated November 2, 1920.

The improved mechanism shown .in the accompanying drawings com rises a rotary magnetic chuck 21 (Fig. 3 acting as a holder for the work, shown as a piston ring R. A bracket 23 surrounds the chuck 21. the function of which i's to protect the chuck shaft bearings andto form a support for the mainy bracket 24, to which it is fastened by bolts 25 l(Fig. 2) and is made adjustable thereon by means of a sliding key and elongated slots 26. To make this adjustment a screw 27 is threaded into the upper end of the bracket 24. This screw has an apertured head 28 to provide means for turning it, Which fits into a slot 30 (Fig. 3) in the bracket 23. 'It will be seen that when the bolts 25 are loosened and the screw 27 is rotated, the whole bracket 24 and all parts thereon will move up or down according to the direction of rotation. The parts now to be described may thus be properly positionedA according to the vertical adjustment ofthe chuck.

In a vertical hub 31 on the bracket 24 a spindlev 32 is mounted andwcarrics a horizontal disc 33 at its-upper end, preferably of of circular holes 34 equally spaced in aboutits margin. This disc acts as a carrier for the piston rings R which are to be ground. The holes 34 are provided with annular locating rings or bushings 35, preferably of hardened steel, which have different interior diameters and are replaceable for various sizes of piston rings.

Each locating ring or bushing 35 may be made as shown in Figs. 9 and 10 with a V- cut in its edge fitting into a coinpleinental shape in the edge of the hole 34 in which it is to be seated. In order to assemble the rings without splitting them, the lower part of the V-cut in the ring is removed at four places, each length so removed approximating one-eighth of the circumference. Also the whole of the V-cut in the hole 34 is similarly removed i'n four places, each length so removed approximating a little more' than one-eighth of the circumference see Fig. 3). It will'be seen that when the .ring 35 is superimposed on the hole 34, as

in Fig. 10, with the cut-away portions ofthe ring above the uncut-away portions of the hole, the ring will be permitted to drop into such position that its upper face and that of the plater 33 will be liush. A one-eighth .turn of the ring will bring the uncutportions of the ring and the hole into engagement, preventing the ring. from moving up or down, Without turning it back again. To hold these rings in position, there is provided a series of slidable lockingplates or dogs 36 (Fig. 3) held in slots in the disc '33 and secured thereto by screws.

The indexing mechanism for the carrier 33 comprises a gear Wheel 38, Fig. 2, mounted on the spindle 32, but free to rotate relatively thereto, and to which is rigidly fastened a cam ,39, (Fig. 11). Engaged with the gear 38 is a piston rodl 4() (Figs. 1 and. 5) having teeth 37 cut .i-n it .for this purpose. The piston rod is guided 1n a housing 401 formed by a depending bracket and is connected to a piston 41 in a double acting fluid cylinder 42 which is rigidly .held to the bracket 24 by bolts, as shown 1n Fig. 2. The cam 39 l1) has a boss '65 to which is pivoted a paul 66 engaging a toothed disc or ratchet Wheel 67 rigidly fastened to the shaft 32. It will be seen that when the piston rod 40 moves in one direction, thus rotating the gear 38 and cam 39, the pawl 66 is caused to rotaie the disc 67 and the shaft in one direction; but when the piston rod 40 moves in the opposite direction no movement of the spindle 32 takes place because the pawl 66 rides over the teeth on the disc 67 Without moving it. The spindle 32 and vall parts rigidly attached thereto has, therefore, a periodic movement in one direction only.

In order to liold the carrier stationary Y after it'uhas been indexed,".the spindle 32 bolted rigidly to the platel 24 and is backedl fmi has 4rigidly secured to itl a circular plate 77 (Fig. 11) with notches78 cut in its peri hery corresponding'in number and anguar spacing tothe-ho s -34 in' Ythe carrier plate 33. 'A plunger bar 79 has its 4 end shaped" to. fit into these notches 78 and when so po sitioned holds the` carrier plate 33 against- .movement The plunger bar, preferably of rectangular. section,- Slides in a bracketv80 up by a spring '82 which alvvaysten'dsto hold the plunger 79 in engagement with' the disc 77. A roller 83 is attached to the' plunger'7 9 and is located in the pathv of the cam 39, so that when the high part 84 of 'the cam engages the roller theplunger'is- :pushed out of its engagement with a notch in the disc 77 and the carrier plate 33 may then be moved by the pawl and ratchet 'the Vposition shown in Figs. 4 and 5 air is -being admitted to the left port hole 48,

` thence by a duct inthe cylinder head l54 to the rear of the piston 41, thereby push -ing the piston rod out while the piston rodend of the cylinder is open to the atmosphere'` throu h theportl 46.' Shifting the `valve lto the eft obviously results in reversin the movement of the piston.

' nder working conditions, when one side of the cylinder is quickly lopened to exhaust andv compressed air admitted to the other end, the resistance to motion'is so small and the momentum in the moving mass is so great that it -is very diiiicult to control an accurate positioning of the piston ring carrying disc 33; also under such a condition it is impossible to prevent' pisl ton rings being broken in thev magazine,

presently to be referred to, due to the hard sharp blows they7 receive when dropped into position within the locating rings 35. To remedy this it is proposed to control both the inlet and the outlet .ofthe piston rod end of the cylinder, as shown in Figs. 6,- 7 and 8. For this pur ose a lug 49 is introduced intothe .dril ed hoe leading to the port 51. Through this plug asmall hole 52 of a definite size is drilled, sufficient to allow enough air to pass through, and thence through the duct 243, to move the piston rod back on its idle stroke Without undue jar. In this stroke there is practically no work being done by the piston except moving the gear 38 and the cam 39 andcon'sequent-ly thereis very little moving' mass to acquire momentum and-cause' jar. On. the. outward or working stroke f of the' piston rod, however, when the mo-' mentum of the moving `parts is great, it is found absolutely necessary to control the speed .of the as possible trol what may be called a cushioning' valve 53,`

plu 49. 4This valve 53 hasaismall hole 55 dr1 ed and chamfer'ed inf-'the center, the diameter of which is .determined -by the desired travelling speed of thewpiston ring" carrier 33. It will be seen that any exhaust from thev piston rod end of the cylinder must come through the drilled hole 55, -forcin the cushioning valve 53 against p iston, making it :as uniform' v his is accomplished by con ing-the rate ofexhaust by means of;l .1

vI6 introduced loosely between 'a shoulder formed by the cylinder head' 54 and the.

the p ug 49,. partially closing the hole therein and leaving only the vvsmallfexitin the-Valve 53 .for exhausting. `This obviously can be reduced to meet any` condi'- tions produced by varyingv air pressures,

and its effectiveness is such that 1t is posi sible to control the vspeed of the movin mass to practically any limit.- Peri hera grooves, as shown, provide suitable mtake ports through. thisA valve. The position of the valve 53, as shoWninFigs. Gand 7, is the most convenient vfor inspection but its vlocationin any place in the exhaust' circuit wo'uld givethe vdesired. results.

The valve slide 44 is 'operated by means' ofthe dogs 56 and 57 (Fig. 1) which operate the 'reversing mechanism of the grinding machine. and .they are adjustably' mounted'on the Wheel head'58 as fully explained. in the White Patent No. 1,184,905

'.[fhes dogsalternately engage a vlever v59,- rlgidly fastened to a rock shaft 60, at o posite ends of the stroke of the wheel hea The-.slight movement of the lever-59 makes it practically instantaneous, and this move- .ment is transmitted through a lever 62'toa,

valve `rod orlink 61, both jmounted at the `rear ofthe machine, thus operating the valve slide 44 to which the link is attached by a pin 64 (Fig.- 4). vThis operation admits air to the piston 41,'which operates the piston rod 40 and the gear 38 at eitherend of the f stroke'of the Wheel head 58. The advantage of using the automatic reversing dogs 56, 57 may be seen'by the fact that it is practically impossible .to have the valve slide 44 in the wrong position `when thus governed.

izo

Mounted on the bracket 24is. a magazineQ plate 68 (Figs. -2 and 3), in which a hole 72 is cut `large "enough to' accomodate the machine; Anumber of vertical bars or rods 69, preferably four, 'of any desired-length are 'ustably' mountedl vertically in relatively adjustable brackets 70 dovetailed into.

largest 'pistonringwvith-in the fscope of the 'slots 7l diagonall cut across the hole'72 in the plate 68, T ese rods form the Imagazine for holding the'stack of piston rings.

.It will beseen that bg means of the elon-l rackets 70, the barsv 69 may be adjusted toward and from thel Agated slots 73 in the ycenter of the hole 72 to enable the magazine to hold different sizes 'offiston rings.l The brackets 70 are held in a justed position by screws, as shown inl Figs. 2 and 3. The vertical adjustment of the bars 69 is secured through set screws 63 (Fig. 2). For they best operating conditions, the bars 69' arel foradjusting the relative distances between the vbracket 2.4,"thereceiving plate 74, and the magazine plate 68.

In Fig. 3 of the drawings, six equi-distant pistonxring receivingholes 34 are shown in the carrier plate 33 but any practical number may be emp oyed. These holes are so spaced that when the late ,33, is at rest, one hole 34 is located directly in the center'of the. hole 72, while another hole is directly over Athe center of the chuck 21; and these two holes are. located in ad'oining positions so as to have the least possilo the work.

The operation of the parts thus far de# scribed is as follows:

The piston rings R to be ground are kstacked between the fourmagaz'inebars 69,

-the bottom ring restingon `the receiving ,plate 74 and inside the locating ring 35 in the plate 33, the size of which has been preselected to'fit the sizeof the piston ring -which is tofbe faced. When thegrindin wheel G reaching its extreme backwar position away from the ring, the current lenergizing the rotary magnetic chuckv or work holder is automatically switched oli", as fully explained in the `Arter Patent No. '1,357 ,924, releasing the ring on the'chuck. Immediately this release is made the dog'56 moves the valve slide 44, by'means of the.

levers 59 and 62 and the rod 61, thereby admitting air into the rear end-of the cylinder Vao 42, `causing the piston rod 40 to move out,

ward, or to the right in Figs. y3'and 5, thus rotating the gear l38 and the spindle 32 through the engagement of the pawl 66 with the ratchet wheel 67. This rotates the carrier plate 33, and the piston ring resting on the receiving plate 74 is simultaneously car ried to the center of. he magnetic. chuck. Likewise thejpistonvring resting on the le distance to carry but gear 90 drives a pinion 91, rigidly attached chuck is removed therefrom at the same time. The finished rings as they are carried away from the chuck drop from the carrier on 4an unloading plate (Fig. 2), which may be provided with a gravity chute'86 to transfer them. to a convenient receptacle or stacking device, such as that shown at S in Figs. 2 and 3.

When thel r-inding wheel G starts on its forward stro e, the rotary magnetic chuck is automatically energized before the wheel touches `the. piston ring, this energizing effect being continued until the wheel has returned tothe same position on the backward stroke. As the grindingvwheel reaches its furthestposition towards the center ,of the pistony ring, the dog V57 moves the lever 59 in an op- Aposite direction so that the valve slide 44y makes an air connection to the opposite end of the cylinder 42 and the piston rod 40 is drawn in. When the piston rod 40 is drawn in, the gear 38 andthe cam .39 being free on the shaft 32, are rotated backward, carrying the p-awl 66 with them, without rot-ating the disc 67. There may be a certain amount of frictionbetween the pawl and disc while it is riding back, tending to move the disc slightly, but this may be taken care of by an automatic brake ofv any convenient form applied to the carrier 33. Such a brake is shown at 223, Fig. s.

` It InayI be noted that a hole is drilled and tapped in the cam 39, inv which may be screwed a handle 88, Fig. 11. This provides means to operate the piston ring carrier 33 by hand, -in case there should be a break downin thel air plant.

Means also is provided to clean the chuck ofgrit, preferably consistingl of an air clean` ler nozzle 89 (Fig. 3), through which air under pressure is forced carrying the flying gritl toa receiving cone of usual form in which a suction is maintained.

Y Thus far the description relates to a mode of operation in which the work is removed after one forward and one backward movement of the grinding wheel head 58. It

`may, however, be necessary to make two or more cuts by the wheel G before removing the work. This may be accomplished by the modified construction shown i'n Figs. 12 and 13. In this construction the gear wheel 90- is ri 'dlyatt-ached to the ratchet wheel 67, y

oth are free on the spindle 32. The

to an intermittent pinion gear e92, both being free to rotate lon a pin 93 screwed linto an adjustable bracket 94. The pinion 92 drives an intermittent gear wheel 95 (Fig. 12)which iskeyed, together' with the locking plate 77, to the shaft 32'. It will be seen that the ratchet wheel 67v can he moved forward by thepawl 66 withoutmoving the gear 95, except when the teeth of the pini'n'92 are in engagement with the teeth of the-gear 95.

I 50., pin 111 to engage the pawls 101 and 102. At

amps@ The number ofreciprocations made by the piston rod foreach advancing movement of the carrier 33 thus are predetermined by.

the ratio of the gearing. The intermittent ratio between the gears 92 and 95 maybe made as desired, and by employing a series of gears 95 and a series of cooperatingpinions 92, suchthat sliding keys would engage any pair, operativefto drive the shaft 32,*it

would be possible'to select, at will, vany'desired number` ofcuts to be given the work before removing it. The same general results can also .be securedv by removing one pair of gears 92 and 93, replacing-them by another vpair having the desired ratio.

The air driven mechanism for operating the carrier plate 33 shas been particularly del scribed on account of its iexibility, quick-.

neLs/s and ease of movement. Similar results co d be obtained by using any other Huid or by an electric motor` or solenoid magnet 'with switch controlled by the wheel head. Where, however, there is no ir4 ressure` available, and itis necessary to e ect thismovement mechanically, the mechanism shown in Figs. 14, 15 vand16 may be used.

Instead of the air cylinder 4piston 40, a simllartoothedrod 400 is arrangedto operate Vparallel to the front-of theY` machine. This rod is pivotally coup-led toa link 96 which is connected to a lever 97 pivoted on a stud 98k on the iframel andhaving at its upper endy two square-shanked studs'99 and 100 engaging alternately with pawls 101 and 102'pivot4 ed on brackets 103` and 104 fastened to they machine' frame. Directly in front of the placed infront of the levers 106 and 107.

Projectingfrom the lever 109 at its upper end is a alternate y by the dogs 56 and 57 like the dogs 56 and-57, respectively, 'and mountedJ Vin the same manner on the wheel head .58.

Just below .the pin in the, lever 109 isa the lower end of the lever 109 is apin 112 so located 'as to engage the `levefrs.106 and 107. In the lever 97 is another pin 113 placed to engage the levers 106 and 107.

l. ground, the'dog 57 -as pushed overthe lever 108 byfits engagement with the 'pin- 110 s erefore in a position from to a position parallel-to that of the'leverv 109.' The action of the dog 57 on the lever 'revolution by toothed disc 67. Iny this mechanism advan` tage is taken of the full movement of the.

in 110 placed so as tobe engagedv I through the i AIn Fig. 15 the grinding wheel head 5.8l has v just reachedits extreme position toward lthe center .nf the piston' ring which vis being -109 moves the lever 106l outward by means of v thejpin 112, increasing the tension in the spring108, and transmittlng this tension to the lever 107. This pressure is transmitted to -the lever 97 through the pin 113, but 'until is thus rotated but without moving t e carrier disc .33. The action on the reverse strokeof the wheel head 58 is exactly like..`

that just described except that in thislatter case the carrier 33 is ,moved one-sixth vof a the pawl 66 acting on the do 56 'and 57I thus gradually tensioning gs v the spring 108 and storing up the energy for, vthe Amovement of thegear 38 at the end vof eachstrOke of the wheel head 58. The'disc 77 is' released and locked bythe cam 39 and plunger 79 as heretofore described.

In Figs. 17 and 18 a modified, andpreferred, form of locating ring for the carrier 33 is illustrated. These rings 120`are of annularform and may present varying internal diameters for receiving piston ring'sof dii'erent sizes. The external diameter is'the same as that of ltheholes 34 inthe ,ring carrier and v lseries of peripheral notches 122 with one t clocking dog 36 (Fig. v3) at each 5 of which y hole 34 cooperates to hold the ring against rotation. A plurality 'of notches 122 are 1Cprolvided to insure a seating of the ring with the upper'surface of the ring. carrier 34. The locating ring is simpler in conilo,

struction than the ring 35fhereinbefore de scribed and is equally effective.

-In Figs.'19 and 20a `control of both-the ush 'wheel head'r'eciprocation andthe indexing movement of thepiston ring carrier by oil or Vother hydraulic pressure is illustrated. An.

oil tank A125 is provided to which is connected a rotary pump, 126 driven by a belt running .on a pullev127. Oi-l is forced by the'pump pi e section 128, tothe lower port of a-directing rvalve'-131. The' plug 132 of thisvalve is rotated within the valve cas.- ing by-gmozements of the lever 59 operated throughimpacts from the dogs 56 and 57 on the wheel head. Two diametrically oplposite vhorizontal ports 'of the valve .131- ave. connecting pipes 133- and 134 leadingto each end; of a cylinder within which is a double actin'lpiston' operating a piston rod i to a lug 137 depending from lthe wheel head. An upper vertical port of and 2O the Wheel head is about to end its of the cylinder to a pipe 147 which joins the forward movement, the handle 59 being at n such an angle that the port 139 ofthe valve is connected, through the plug port :140, with the pipe 134. Passage of. the oil through the pipe 134 forces the piston to the left (Fig. 19) and the contained oil in the cylinder dischargesthrough the pipe 133, plug port 141 and circular port 142 to the pipe 138 andV thence to the tank. When the dog 57 meets the lever 59 at about the end of the forward movement of the Wheel head-the plug 132 is rotated to bring its ports 140 and 141 into the dotted lineposition shown in Fig. 20 and the direction of movement of' the piston is immediately reversed, as will be understood from the foregoing description. The reciprocation of the Wheel head is thus automatically continued Whenever the inlet pipe 128 is open. This is controlled by a valve 143 conveniently placed near the pump, Which also regulates the rate oi' lflow and consequently the speed of rotation.

In'this form of the invention it is proposed also to control the ring carrier indexing mechanism by oil pressure. To this end a branch i144 from the inlet pipe 128 is provided, which leads to the inlet port 47 of the cylinder 42 shown in Figs. 4 and 5. The same mechanism for operating the valve slide 44 from the lever 59, as is shown in Fig. 1, can be employed and pipes 145 and 146` lead from the outlet ports at each side return pipe 138. In this construction the face on which the valve 44 slides yis widened, as shown in Fig. 21,- to take two outside ports With which the pipes 145 and 146, respectively, communicate. With these connections the piston rod 4() for operating the ring carrier indeiring mechanism is actuated from the traveling head, as beforeb'ut by oilinstead of air.

It is also contemplated that both the magnetic chuck which holds the piston rings, and also the grinding Wheel, may be driven by turbines operated by iiuid pressure, and this arrangement is particularly advantageous when the Wheel head and the indexing mechanism are operated by hydraulic mech# anism. It Will be understood further, that some of the features of the invention are useful in grinding machines of the type Where the Work is reciprocated, instead of rotated, with relation to a rotating grinding Wheel. i

Nothing herein contained is to be inter,- preted as limiting the invention in the scope of its application to usejn connection with the particular .machina or the. particular modes of ,ope1ation, or both, selected for the purpose "of illustration and explanation.'

l/Vhile the particulars of construction hereinn set forth are Well suited lto the lvarious forms of the invention disclosed, the invention is not limited to these details of construction nor to the conjoint use of all its features, nor is it to be understood that these par- 'l0 ticulars are essential since they may be variously modified Within the skill of the artisan Without departing 'from the true scope of the actual invention, characterizing features of which areset forth in the following 'l0 claims by the intentionall use of generic terms and expressionsinclusive of various modifications.

What is claimed as new is:

1. A grinding machine of the character described having, in combination, a work holder, a grinding tool, said holder and tool being relatively rotatable, mechanism for` the combined delivery of the articlesto be ground to and their removal from said holds' er, and ,fluid pressure means `for actuating said mechanism.

2. A .grinding machine of the character describe-d having, in combination, a Work holder, a grinding tool, means to move vthe tool over the articles to,A be ground,va work carrier for delivering articles to and remqving them from the Work holder, and means controlled by thertool movement for operating said work carrier.

A grinding machine of the'character described having, in combination, a Work holder, a reciprocatory grinding tool head, a rotary Work carrier for holding a plurality of articles to be ground and successively delivering them to and removing them from thevwork holder, and means controlled by the later portion of the stroke of'said head for intermittently rotating said Work carrier. f f

.4.,A` grinding machine of the character described having, in combination, a ygrinding Wheel, a Wheel head mounted for reciprocating movement to traverse said Wheel over the work, a Work holder, a Work carrier` 119 forv delivering articlesto be ground to said holder and removing them froml said holder,

a fluid pressure mechanism for Aoperating said carrierf and connections between said mechanism and said Wheel head for con- 115 trolling the operation oi'said carrier in aczordance with the movements of said Wheel iead. i f

5. A grinding machine of the character described having, in combination, a Work holder, a rotary Work carrie-r adapted to receive a plurality of articles to be ground and move each article in a path over said "holder,

-fluid` pressure mechanism for lindexing said carrier step by step to deliver articles to l said holder, and means for supplying Asaid carrier with articles during periods of rest thereof. v

f 6. A grinding machine of the character described having, in combination, a Work l `one part from the other.

holder, a grindingl tool, an intermittently movable Work carrierfor transferring articles to be ground to the holder, means for ment of the other part for controlling the delivery, of fluid to said-piston.

8. A grinding machine having, in combination, a movable tool head, a movablejwork carrier for presenting articles to the tool, fluid pressure mechanism for operating one of said parts, mechanical'means for operating said other part, and interconnected mechanism for controlling the movement of 9. Afgrinding machine'having, in combi;

nation, amovable tool head, a movable Work carrier for'presenting articles to the` tool,

fluid pressure mechanism for operating said lWork carrier, mechanical means for' operating said tool head, and means on the tool head for timing the effective operation `of said fluid pressure mechanism.

10. A grinding machine havmg, in com.-

vbination, 'a grindin wheel, a reciprocating Wheel head supporting said Wheel, a holder for supporting Wol-k for the operation thereon of said Wheel, an intermittently rotatable carrier for presenting articles of work successively to said holder, fluid pressure operating means for rotating said work carrier,

'and controlling mechanism for said fluid 'pressure meansarranged to be actuated by said wheel head.

11, lA grinding'machine having, in co-mbination, a work holder, a reciprocatory tool head carrying "a grinding too a Work carrier for transferring articles to be ground -to said holder, means fory intermittently carrier for .transferring to said holder, means tool head to cause the -tool to traverse an' moving said carrier,and means for recipro'4 eating said tool head a plurality 'of times during 4each Yriod oli-rest of the' carrier. 12. A grin ing'machinehaving, in combination, a work holder, a reciprocato'ry tool head carrying a grinding tool, a work articles to be ground or reciprocating said article delivered to the holder, and, means -controlled bysaid tool head movementior intermittently moving the carrier,*including -`mechanism permitting' a plurality of traverses 'of the head between each effective movementof the carrier. i 13. A grinding machine, having, in oom- 'binatiom a Work holder, a' reciprocatoryltool head lcarrying a grinding tool, .ya Work carrier. for transferring articles to be ground to said holder, means for reciprocating said head' to cause the-tool to traverse an article delivered to the holder, means controlled by said tool head movement for intermittently moving the carrier, and means for rendering .certain traverses of' said head inellective tomove thecarrier. y

14. A grinding machine having, in combination, a Work holder, a reciprocatoly tool head carrying a ding" tool, a Work carrier for transferring articles to bey ground to said holder, means for reciprocating said head to cause the tool to traverse an article delivered to the( holder, meansfcontrolled by said tool head movement for intermittently moving the carrier, and means for utilizing preselected reciprocations of said head in regular vseries forel'ectingmovements of the work carrier.

15. A grinding machine having,in combination, a work holder, a work carrier, and means to impartian intermittent movement to'the carrier to successively transfer articles to be ground to the holder comprising fluid pressure mechanismincluding a double acting piston having its piston rod operatively. i

connected to said carrier, a cylinder for said piston having an vinletv and outletv port, and

means in the fluid circuit for retardingthe flow Vof fluid through said port in one direction only.

16. A grinding machine having, in combination, a work holder, a work carrier, lluid pressure means for moving lthe carrier to transfer articles to be ground to the holder, said means including a cylinderand a piston Working therein an means in the fluid circuit or-.controlling the rate of exhaust lof the fluid from said cylinder.

17. A grinding machine having, incombiation, a work holder, Va work carrier, a

fluid pressure means for moving the. carrier to transfer articles to vbe ground to the` holder, and means in the fluid circuit for controlling-theA rate of exhaust of the fluid,

.comprising a cushioning valve' providing a.

port, but movable by the'l t suitable intake exhaust to g're'a yI reduce .the size of the opening forming said' rt.

18. A grinding mac ine having, in combination, a work holder, a-Work carrier, a' fluid ,pressure means for movmg-the carrier.

to transfer articles vto be ground vto the holder, and means inthe fluid circuit for controlling the rate of exhaust of the fluid, comprising a valve seated 'for sliding movement -in the lluid conduit, constructed to provide an adequate intake port when in one ition and a restricted exhaust port when 1n another position.

19.- A grinding machine .havingfin combination, awork holder, a work carrier,

a fluid pressure means for moving the car-v rier to transfer articles to be ground to the. 13

holder, said means including a cylinder and loo iis

a piston therein and means in the fluid circuit for controlling the rate of exhaust of the fluid from said cylinder, comprising a valve movable to one position by the intake pressure permitting free inlet of the fluid and to another position by the exhaust pressure providing a restricted exhaust of the fluid.

20. A grinding machine having, in combination, a grinding wheel, an intermittently movable piston ring carrier having a circular ring holding pocket of a diameter to receive the largest ring to be ground, and provided With circumferential means for receiving and removably holding an annular locating ring having an interior diameter to fit the piston'ring to be ground, said locating ring also having circumferential means to cooperate in locking engagement With said carrier means, and means for successively supplying said pocket with piston rings and driving the carrier to successively transfer said rings to the grinding Wheel.

21. In a grinding machine of the type in which piston rings or the like are successively presented to the grinding Wheel by means of an intermittently rotatable carrier having a plurality of circular pockets for receiving the rings, means for locating piston rings of diderent diameters in said pockets comprising replaceable annular locating rings having the same exterior diameter as the pockets but varying interior diameters, and means cooperating both with said rings and the carrier for locking any one of a series of said locating rings in one of said pockets Hush with the surface of the carrier) 22. In a grinding machine of the type in which piston rings or the like are successively presented to the grinding Wheel by means of an intermittently rotatable carrier havin a plurality of circular pockets for receiving therings, means for locating piston rings of different diameters in said pockets comprising replaceable annular lo- Y cating rings having the same exterior diameter as the ockets but varying interiorv diameters, ,and means on said locating rings and pockets for locking said rings to the carrier by a rotative movement of the ring lrelative to its receiving pocket.

23. In a grinding machine of the type in which piston rings or the like are successively presented to the grinding Wheel, an inltermittently rotatablecarrier having a pluockets for receiving the ocatino piston rings of pockets comprisrality of circular rings, means for different diameters in said ing replaceable annular locating rings having the same exterior diameter as the pockets but varying interior diameters, said ring holding pockets each being provided with circumferential means for receiving and holding one of said locating rings flush Withl the surface of the carrier, each of said lo- `cat-ing rings also having circumferential means to cooperate in locking engagement with said carrier means, and `means at each pocket for holding the locating ring therein against rotation.

24. In a grinding machine of the type in which piston rings or the like are successively presented to the grinding Wheel, an intermittently rotatable carrier having a plurality of circular pockets for receiving the rings, means for locating piston rings of i different diameters in said pockets comprising replaceable annular locating rings having the same exterior diameter as the pockets but varying interior diameters, said ring holding pockets each being provided With circumferential means for receiving and holding one of said locating rings flush with the surface of the carrier, each of 'said locating rings also having circumferential means to cooperate in locking engagement with said carrier means and having a notch in its outer edge, and a movable dog onthe carrier adjacent to each pocket for engaging in said notch to prevent rotation of the ring While in its pocket.

movable piston ring carrier having a circu-l lar interiorly threaded ring holding pocket, an annular exteriorly threaded locating ring adapted to be screwed into l said pocket whereby the locating ring is readily replaceable by one of another. interior diameter, means for successively supplying said' pocket with piston rings, and means driving the carrier to ysuccessively transfersaid rings to the grinding Wheel.

'27..A grinding machine having, in com- Ibination, a Work holder, a rotary spindle supporting a Work carrier, means for supplying said .carrier with articles to be ground, a reciprocatory tool. head carrying a grinding too operative to reciprocate the tool head and to index the spindle step by step to sucessively deliver the articles to the Work holder in imed relation to the movements of said too 28. A grinding machine having, in combination, a Work holder, a rotary spindlef supporting a Work carrier, means `for supplying said carrier with articles to be ground, a reciprocatory tool head carrying a grinding tool, two fluid pressure cylinders with double acting pistons having their piston and a fluid pressure system the spindle,

rbination, a work rods operatively connected respectively to the tool head and the spindle to operate them, means for supplying Huid under pressure to one cylinder :for moving"one of said parts and mechanism operated: by the movement of said part for controlling the supply ot uid to the other cylinder. y

29. A grinding machine having, in combination, a vWork holder, a rotary spindle supporting a Work carrier, means for supplying said carrier with articles to be ground, a reciprocatory tool head .carrying a grinding tool, two fluid pressure cylinders With double acting pistons having their piston rods operatively connected respectively to the tool head and the spindle to operate them, means for supplying fluid under pressure to the cylin er having its piston connected to the tool head, mechanism oper- -ated by the movement imparted to the tool head for controlling the supply of Huid to the cylinder having its piston connected to and means for causing each alternate stroke of said last named piston to be idle with respect to said spindle.

rotation.

30. A grindin machine having, in combination, a wor holder, a movable Work carrier tor presenting articles to the work holder, a reciprocatory grinding tool, and iiuid pressure mechanism for reciprocating the tool and moving the Work carrier.

31. A grindingl machine having, in comv holder, a movablework carrier for presenting articles to the Work holder, a reciprocator7 grinding tool, fluid pressure mechanism or reciprocating the tool and operating the Work carrier, the time of operatmn of the latter being controlled by the movement of the tool.

32. A grinding machine having, in combination, a rotatable work carrier, a reciprocating grinding tool, a iuid pressure work carrier indexing mechanism, and an actuator for said mechanism controlled by the reciprooations of said tool.

33. A grinding machine having, in combination, a work holder, an intermittently movable work carrier and connected operating mechanism therefor, and means for adjusting thevertical position of the carrier and attached parts relative to the holder.

Y34:. A grinding machine having, in combination, a Work holder, an intermittently' movable work carrierfor transferring articles to the holder, Huid pressure oper ating mechanism tor operating the' carrier, and means for adjustably sustaining said carrier and mechanism relative to the holder. l

35. A grinding machine having, in combination, a Work holder, a rotatable vyork carrier, a Work carrier spindle with au attached ratchet and cooperating pavvl, fluid pressure mechanism for operating said pawl, a single bracket for sustaining said carrier and its operating mechanism, and means for adjusting said bracket vertically relative to the Work holder.

36. In a grinding machine of the type in which thearticles to be ground `are supplied to a carrier which transfers `them to the grinding Wheel, a magazine adjacent said carrier for` containing a stack of said articles comprising a plurality'of side bars, holders for said bars, and means permitting a relative adjustment of the holders to vary 'he area of the space circumscribed by said ars.

37. In a grinding machine of the typev i in which the articles to be ground are supplied to a lcarrier which transfers them/to the grinding Wheel, a magazine adjacent said carrier for containing a stack of said articles comprising a plurality of brackets vpresenting vertical bores, and a bar adjust ably held in each of said bores whereby the movement of projection of said bars below the brackets may be varied.

38. 'In a grinding machine et the type in which the articles to be ground .are supplied to a pocketed intermittently driven carrier which transfers them to a grinding Wheel, a magazine located above the path ot travel of said pockets comprising a plurality of spaced side bars constructed and 'mounted for adjustment toward and from said carrier.

39.' In a machine for grinding piston rings and the like, the combination of a grinding wheel, a magnetic chuck for holding articles of work in position for the operation thereon of said Wheel, a carrier made of nonmagnetic metal and havingba recess therein to receive an `article to e ground, said carrier being movable to present said article to said chuck, and a bushing for said re' cess made of a metal `substantially harder. .than that of which the carrier is made, said bushing being removably supported in saidv recess.

WILLIAM ARTER.

Images