US1530488A - Grinding machine - Google Patents

Description

March 24, 1925 F. E. GARDNER GRINDING MACHINE 5 Sheets-Sheet 1 Filed June 20, 1921 5 Sheets-Sheet 2 M&

March 24, 1925.

v F. E. GARDNER GRINDING MACHINE Filed-June 20, 1921 jrzaizfoz/ II I I v 'VIWIIIIIIIIIIAIIIIII I w March 24, 1925.

F. E. GARDNER GRINDING MACHINE 5 Sheets-Sheet Filed June 20, 1921 March 24, 1925. A 41,530,488

- F; E. GARDNER GRINDING MACHINE v Filed June 20; 1921 5 Sheets-Sheet 4.

ii I! llllllllllllll' March 24, 1925. 1,530,488

F. E. GARDNER GRINDING MACHINE Filz ad June 5,0,j921 Sheets-Sheet 5 fi eak z'c 54745762 I Patented Mar. 24, 1925.

nnnnnnio n. GARDNER, or BELOIT, W sconsin.

GRINDING MACHINE.

' Application filed 'Iune20, 1921. Serial No. 478,829.

To all whom it may concern:

Be it known that I, FREnnRio E. GARD NEH, a citizen of the United States, residing at Beloit, in the county of Rock and State of Wisconsin, have invented certain new and useful linprovements'in Grinding Ma chines,.of which the following is a specification.

My invention relates to grinding nachines of the type in which a revolvable work holder is associated with a rapidly revolving grinding disk to successively present to the grinding wheel objects to be ground.

One. of the important objects of the invention is to provide improved arrangement in which a grinding disk is mounted to re volve about a horizontal axis, and thework holder in the form of a reel is also mounted I of the table shifting.mecha-nism.

to rotate about a horizontal axis, the. axes being offset so that the holder will successively carry objects across a portion of the grinding wheel. i

Another important object is to provide transversely shiftable tables on the work carrier and improved means for successively shifting said tables to present to the grinding wheel objects which have been secured on the table.

Another important object of the invention,

is to provide improved cam and spring mechanism for controlling shifting of. the

tables. A further object is to provide yielding means for exerting the required pressure on the tables to cause work thereon to be powerfully. applied against the grinding wheel, together with means for positively limiting the travelv of the tables to insure the proper degreeof grinding.

Another important feature of theinvention resides inmeans forbodily adjusting the work .holder structure on its supporting shaft and without destroying the adjustment The above and other features of vention are incorporated in afmachine disclosed on the accompanying drawing, it be ing understood that changes and modifications could readily be made which would still come with-in the scope of my invention; On the drawings, Figure 1 is a plan view, Fig. 2 is a side elevational View partly in section to disclose the gearing train,

Fig. ,3 is a diametrical sectional view, through the work carrier reel showing the plane 4 '4, Fig. 2,

plane 99, Fig.

' Referring to the drawings, on

micrometer top adjustment and the means for bodily adjusting the reel,

Fig; 4 is an enlarged sectional view on 'Fig. 5 is aplanview of the parts shown in Fig. 4,

Fig. 6 is anenlarged end view from the right of Fig. 2, i v

Fig. 7 is an enlarged sectional iew on plane 77, Fig. 2, p I

.Fig. 8 is an enlarged'sectional view on plane 88, Fig. 2, and I Fig. 9 is an enlarged sectional view on Generally speaking, the machine comprises a grinding disk mounted on ahorij zontal axis, and a work carrier structure ro- [ta-table on a horizontal axis wh ch is parallelwith but offset from the axis oft-he grind-.

.ing-disk. The work carrier has a plurality of guideways for work supporting tables and .cam mecha1nisin' .is provided for shifting these tables at the proper time to carry work thereon into engagement with the grinding disk, the. work carriers beingcarried with thework carrier structure .to be swept across the disk while; the disk is rotated. Means are provided for forcibly though yieldably shifting the work'ho'lder tables to apply the work thereon to the grinding disk and" micrometer setting mechanism is provided for determining the amount of grindingthat is to be performed on the ob ect so thataccurate grinding will result.

the bed plate 1O are. the bearing pedestals 11 and 12 which attheir upper ends journal the shaft 13 on which is isupported; the work supporting .drum or reel structure designated as a whole At 'the other end of the machine arethe bearing pedestals 14 and 15 which journal at their upper. ends the shaft 16 which sup-v U ports the grinding disk 17.; vThe shafts 13 and 16are horizontal and parallel but are offset laterally adistance as clearly shown in Fig. 1

On the shaft 16 is provided the'pulley 18 by which the shaft may be rapidly rotated as bymeans of a belt.

The driving means for the reel R are clearly shown in Figs. 2, 8 and 9. The transmission trains controlling the rotation of the reel are within. the protecting housing 20 -which forms partqof tlle'machine support mg framework.

v 011 onefof the side walls of the housing is the cylindrical part 21 through which extends the drive shaft .22 to be suitably 'journa'led at its end preferably on anti-friction bearing mechanism 23. At the outer end of the shaft is the driving pulley 24 and at the inner end of the shaftis the bevel pinion 25. The pinion 'meshes with the bevel gear 26 secured on the rear end of the shaft 27 which is journa'led in suitable bearing boxes 28 and 29 supported on the intermediate 'walls 30 and 31 of the housing structure-20. The shaft 27 is horizontal and "extends at right angles to the shaft 22 and at its front end carries the gear pinion A countershaft 33 extends parallel alongside of the shaft 27 and is journals-d in suitable bearing structures 84 and 35 supported on the intermediate walls 30 and 31. At its front end the shaft 33 carries the spur gear 36 which meshes'with the gear pinion 32. The gear and pinion are within the compartment 137 in front of the wall 31 which compartment is accessible by virtue of the removable cover 38 so that the gear and pinion may be readily changed to "adjust the transmission relation between the shafts 27 and '33.

Between the bearingstructures 8'4 and 35 the shaft '33 carries the worm 39 which meshes with the worm wheel-40 rotatable on the shaft 41. This-shaftis above the shafts .27 and 33 and extends horizontally at right angles to such shafts and is suitably journaled in bearingstructures 42 and 43 in the side walls of the housing "frame 20. At its outer end the shaft 41 supports the gear pinion 44 which meshes with "the gear wheel 45 secured to the reel shaft 13 and protected within the housing 46. Through the gearing train just described the reel shaft is slowly but powerfully driven.

Clutch -mechanism is provided for controlling the rotation of the reel. On the shaft 41 is splined the clutch collar 47 which has the annular groove 48 for receiving the pins 49 extending from the fork frame 50 which is secured to the shaft 51 to swing when the shaft is rotated by means of its lever '52. 'The adjacent :ends of the clutch collar and gear have clutch projections 53. When the lever 52 is swung in 0ne direction the clutch fork will shift the. collar 'to carry the clutch projection into engagement so that the shaft-41 will ibeconnected to be retated with the worm wheel 40. When the lever 52 is swung in the opposite direction the parts are unclutched and the worm wheel rotates idly on the shaft 41 and the carrier is at rest.

,shaft, the reel overlapping the ner wall 57 of each extension is a continuation of the reel side wall 53 and has the threaded sleeve 58 formed thereon parallel with the reel axis for receiving a threaded abutment bushing '59. The sides of each extension are formed by continuations of the cylindrical wall of the reel. The ends of the side walls have flanges 60 and 61 whose upper faces formthe seats for the respective work holding tables 56. "Strips 62 and G3 are secured to the under sides of each table 56 and engage against the under sides of the flanges 60 .and 61 to thus hold the table on the extension, the-table being pivoted on the pinGS which extends radially (Fig. A distance inwardly of'the cam block passageway each table has a .lug

through which extends the stem section :71

of the cam head, the stem section 7 2 being a continuation of the section 71 but of reduced diameter and extending through the threaded bushing 59 and engagedat its outer end by the abutment nut 73. At the base of the reduced stem section .72 is the nut 7.4 between which and the inner end of thebushing 59 is the compression spring 75. On the stem section 71 between the cam block 67 and the lug 70 is the spring 76. The spring 75 is thus interposed between the reel frame and the slidable table and the spring 76 travels with the table. The spring 7 5 is lighter than the spring 76 and resists inward travel of the table and tends to shiftthe table and the cam block outwardly so that the the cam rail 77 supported on the inner end of the bracket- 78 which isadjustablymounted on the side of the bearing pedestal 12.

The tables 56 have grooves 79 therein for receiving clamping bolts by means of which work or Work holder fixtures may be secured .on the tables. In the arrangement shown the shafts 16 and 13 are horizontal cam rollers 68 may engage successively with with the reel shaft in front of the grinder grinding wheel a suiiicient distance so that the work carried on the tables 56 will be swept across the wheel between its periphery and axis. As thereel rotates the cam rollers will successively encounter the cam rail 77, the result of such engagement being inward shift of the tables to apply the work thereon against the grinding wheel, the spring '75 being free to shift the tables outwardly after they have passed across the grinding field.

The objects to be ground are applied at tables until the work hereon has been fully the front "o'it the machine and are accurately positioned on theftahles in correspondence with the amount or" grinding desired. "Before a roller reaches the cam rail thespring shifts the cam 'block'with its stem outwardly with the abutment =heac'l73 against the bushing {59. hen a roller encounters the rail the tables will heurged powerfully though yieldably toward theggrinc ling disk through the spring '76and the work on the table will be -ground. The spring 76 projects the machine against injury which might re: suitfrom irregularities during grindingif the cam r oljler were directly mounted on the work holding table. After a cam roller leaves the cam rail the corresponcling spring 175 will be free to shift the table outwardly to its normal position. The force of the spring '75 can 'he'readily adjusted means of the threaded abutment bushing 59.

In order to accurately limit the travel of the work holding tables to insure accurate grinding, I provide micrometer setting mechanism in connection with each table. Such'mechanism is clearly shown in Figs. 1, 2 and 3. Each table has 2. lug 80 depending therefrom for supporting a micrometer screw '81, which screw carries a micrometer For dial 82 and has the knurled head "83. each micrometer screw 82 an abutment wall 84% is provided on the reel'framework. 'U-pon turning of the micrometer screw the pointer '35 will indicate on the 'dial the width of the gap 86 between the screw "and its abutment '84:, the widt-hof gap determining the amount of grind on the work supported on therespectivetable. In the gap shows. In Fig. 1 the cam roller for the rear table is'in engagement. with the cam rail and'the gap is closed, the micrometer screw abutting against its lug to prevent further movement of the table toward the grinding wheel; The cam rail is so positioned that the cam block 67 will be shifted inwardly a greater distance than the adjusted distance between the micrometer screws and ahutments. With this arrangement the compression springs 76 will always exert pressure against the ground, that is, until the micrometer screws engage with the ahutments to positively stop further movement of the tables; In oth r words the throw of the cam blocks by the cam rails is sufiicient to cause enough compression energy to he stored in'the spring" 76 that they may exert sufficient grinding pressure until the tables are positively stopped by the micrometer screws and theirahutments.

suit lole gauge bloc as or lay first securing we; holding fixtures on the tables o'hjects can be quickly and accurately mounted on the tables for accurate grinding, Sometimes, in View of the nature of the work or on account of its irregular shape, parts to be ground may, have to extend radially inwardly across the iunei end of thetahle. i To provide for this I make the reel adjustable as a. whole on its supporting shwtt. Accondngly the hubs-87 and 88 of the reel'ztrame are splined on thesha'tt l3 shown in Fig 4-, and-between the hubs a split collar- 89 is clamped and rigidly secured hy a set screwSO. Journaled in the side walls-53 and 54: of the ZGQl frame "is the shaft '91 which threads through the collar 89 'anc'l is held against longitudinal movement by the' collar 92 and bevel gear 93 secured thereto Journaled in the cylindrical wall of the reel structure and extending at right angles to the shaft 91 is theshaft 94- which at its inner end carries the bevel gear 95 andat its outeren d has the head 96,:the gear 95 meshing with the gear 93. Upon turni n g of the "head 96 the shaft 91 will he turned a-nd'the' reel frame will he adjusted onits shaft 13 toward or away from th'egr-inding wheel. The ree'l frame can thus be readily moved away from the grinding wheel to allow for overhanging or projectingparts .on castings, or the adjustment canalso serve for accurately shifting the reel frameinwardly to compensate for grinding :wear -on the grinding wheel.

In order to maintain the proper relationship between the 'cam rollers and, the cam rail, the rail supporting bracketYS is-shifted with the reel frame during adjustment thereof. The huh 88 is provided with the annular groove 97 into which-extends the arm 98 on the bracket 78, and the bracket has the slots 99 350i its bolt-s 100. Before adjustment of the reei't'rame is made the bolts 100 are loosened so that the bracket 78 may shift, and after adjustment the bolts are again tightened. The camming adj ustment between the bracket 78 and the/respective work holding tables will therefore he n'iaintained during any adjustment of the reel frame.

outlet 102 on this housing may he'connected hyfpipe 108 with a suction'device for conveying away the grinding dust.

V The operator stands in front of the 'Hl21 chine and applies the work to the supporting tables. Usually, work supporting fir;- tures are permanently attached on the tables into which the objects to be ground can be quickly andaccurately clamped in proper position with reference to the grinding wheel. If necessary the operator can quickly stop the work supporting reel by swinging the lever 52 which controls the clutch mechanism already described. As the reel revolves comparatively slowly the micrometer screws 81 can be set while the reel is revolving, and the bodily adjustment of the reel structure toward or away from the grinding wheel can also be readily made while the reel is revolving by turning the head 96 of the adjusting mechanism. The machine as a whole is of simple and economical construction and is very efiicient.

I claim as my invention:

1. A grinding machine having, in COl11-' bin-ation, a grinding element rotatable on a horizontal axis, a cylindrical drum having a plurality of longitudinal ways on its peripheral surface, said drum being rotatable on a horizontal axis oflset from the axis of said grinding element whereby said drum and said element will partially overlap, fixtures on said vavs for su mortin a 3lurality of work blanks at various stations about the periphery of said drum, means including a cam for effecting a relative movement of said grinding element and one of said fixtures toward each other when said fixture is carried across the face of said element, and resilient means for opposing said movement.

2. In a grinding machine, the combination of a grinding wheel, a work supporting structure, a work holding table shiftable on said structure, means for moving said structure to position the table in front of said wheel with an object thereon against said wheel ready to be ground, a stationary lug on said table, a shiftable block there-on, an elastic member between said lug and block,

and means engaging with said shiftable block during movement of said structure whereby energy is stored in said elastic member and said energy expended in forcing said table toward the grinding wheel whereby work thereon is ground.

3. In a grinding machine, the combination of a grinding wheel, awork supporting structure, a work holding table shiftable on said structure, means for moving said structure to position the table in front of said wheel with an object thereon against said wheel ready to be ground, a stationary lug on said table, a shiftable block thereon, an elastic member between said lug and block, means engaging with said shiftable block during movement of said structure whereby energy is stored in said elastic member and said energy expended in forcing said table toward the grinding wheel whereby work thereon is ground, and adjustable means for limiting the movement of said table toward said wheel.

A grinding machine having, in combination, a grinding element, a work supporting drum mounted in overlapping relation with said element, said drum having a plurality of wayson its periphery for supporting series of work blanks at different stations around said drum, means for automatically and selectively effecting a relative movement of each work blank and the grinding element toward each other when said work blank is carried opposite said element, means for limiting the extent of said movement and means for separating said grinding element and said work blank after the grinding operation is completed.

5. In a grinding machine, the combination of a grinding wheel, a work supporting structure, a work holding table shiftable on said structure, means for moving said structure to posit-ion said table in front of the grinding wheel to present work thereon to said wheel, a. light spring tending to shift said table out, a lug on said table, a block on said table, a compression spring between said lug and block, and a cam means in the path of said cam block when said structure is moved to position said table, engagement of said shiftable abutment with said cam means causing said compression spring to be compressed and said table shifted inwardly against the force of said light spring to yieldingly press work on the table against the grinding wheel.

(3. In a grinding machine, the combination of a grinding wheel, a work supporting structure, a work holding table shiftable on said structure, means for moving said structure to position said table in front of the grinding wheel to present work thereon to said wheel, a light spring tending toshift said table out, a lug on said table, shiftable block on said table, a compression spring between said lug and shiftable block, a stationary rail in the path of said'shiftable block when said structure is moved to position said table, engagement of said shiftable block with said stationary rail causing said compression spring to be compressed and said table shifted inwardly against the force of said light spring to yieldingly press work on the table against the grinding wheel, and adjustable means for limiting the inward movement of said table.

7. In a grinding machine, the combination of a grinding wheel, a work supporting structure movable in a direction parallel with the grinding face of said wheel, a work holding table shiftable on said structure in a direction at right angles to the grinding face, movement of said structure serving to position said table in front of the ital grinding face to bring work thereon into grinding position, a cam blocln traveling with said structure, a compression spring between said block and said table, a:v cam; in

the path of said block when said structureis moved to positionysaid table, engagementof said cam and block causingvcompression of said spring and yieldab'lel inward: .inovement of said table to press wonkithereon against the grindingwhee-l, andrmeans for bodily adjusting said structure in: a direction at right anglesto thewgrind ing face of said grinding wheel." I

8. In a grindinginach ine,the combination of a grinding wheel-, a work supporting structure movable-in a direction: parallel with the grinding face ofsaid' wheel, a. work holding-table shift'able' on: the peripl'iery of said structure in direction at r'ight ang les to the grindii'ig face, movement: of sa -id structure serving to position said tablefin the grinding dept-h whereby said table will be yieldably forced by the relaxation of said spring to press the work against the grinding wheel until the table is stopped and the worn has been fully ground.

9. In av grinding machine, the combination of a grinding wheel, a shaft, a work supporting structure on said shaft adapted to rotate therewith in a plane parallel with the grinding face of said wheel, work holding tables shiftable' transversely on said structure in a direction at right anglesto the grinding face, revolving of said structure serving to successively position said tables in front of the grinding face to bring Work thereon into grinding position, cam mechanism effective during revolving of said structure to shift the tables inwardly after positioning thereof to thereby apply 'the work to the wheel to be ground, said supporting structure being longitudinally shiftable on said shaft, an abutment fixed on said shaft against longitudinal move ment thereon, and an adjusting train between said abutment and said structure operable to shift said structure longitudinally on said shaft.

10. In a grinding machine, the combina tion of a grinding wheel, a work supporting frame, work holding tables reciprocable on said frame, said frame being revolvable to cable toward and away from the grinding A position: said! tables in) front ofithe 'gniznd wheel to present work thereon to the grinding face, earnengagang. means: for each table; a cam rail: supported; imthe patliwofi said camengaging. means when said supporting frame revolves whereby saidtablesgare successively shifted; inward-1y to, cause work; thereon to! be applied to. g the grinding wheel,Ills/a118,. 0 bodily adjusting said supportingairame Q ward and away from; the grindingin r and a connection betweenisaitli canrrail and id framefor causing said rail toobe. sh fted with. said frame; during bodily adjustm n thereof whereby the camming; {relation be tween sa d.- rail: andthe tables came-engaging nieansismaintained's. v

a 1'1.:- 111i a, grlndlng'; machine; on the-.clafisi escribed; the, combinationof a; grindingwheel, a. work supporting frainer,-,'. Work: holding tables havingiwoiik-retaining. gnootlcsiall lt-bing shift-able oin the peripheny ofrsa'icl; frame, SillCl: frame being-resolvable to success wheel and said tables beingi sllif table" to:

ward and away frlomrthe; grindillg face 1:

present work thereto; a,movablc bloumfdl" each table, a compression spring between each table and its movable block, a cam posi-. tioned in the path of said movable blocks when said supporting frame revolves where by said springs are successively compressed to have energy stored therein to be expended in yieldably forcing the tables toward the grinding face to cause workthe-reon to be ground, and adjustable stop mechanism for each table for limiting the inward movementthereof by the associated sprin 12. A grinding machine having, in combination, a grinding disk rotatable on a horizontal axis, a work supporting frame revolvable on a horizontal axis offset from the axis of the grinding disk whereby said frame and disk will only partially overlap, radial extensions on said frame, seats formed on said extensions, transversely shiftable tables mounted on said seats, and means for shiftingsaid tables when in overlapping position with reference to said grinding disk whereby work on said'tables will be "presented to said disk to be ground.

13. A grinding machine having, in combination, a revolving grinding wheel, a cylindrical work supporting frame, radial extensions on said frame formed by continuations of the cylindrical wall of said frame, flanges on said extensions, work supporting tables mounted on said flanges and adapted to be successively carried by said frame into grinding position with reference to said wheel, and means for shifting said tables when in such grinding position whereby work thereon is presented to the grinding wheel. I

14. A grinding machine having, in combination, a rotatablegrinding wheel, awork supporting structure, a work holding table slidable on said structure toward and away from said wheel, a stationary lug on said table, a second lug having a passageway therethrough on said table, a cam block slidable within said passageway and having a stem passing through said first mentioned lug, spring means on said stem and between said lugs, and cam means for compressing said spring means to force said table against said wheel.

15. A grinding machine having, in combination, a grinding wheel, a revolvable sup porting frame having ways on its periphery, a plurality of transversely shiftable work supporting tables on said ways and having grooves for securing work thereto, said tables being adapted to be carried into grinding position with reference to said wheel, and means for shifting said tables along said ways when in such grinding position whereby work thereon is presented to the grinding wheels.

16. A grinding machine having, in com bi'nation, a grinding wheel, a movable work supporting structure, a work holding table slnftable on said structure, resilient means tending to hold said table outward with re spect to the grinding wheel, resilient means for pressing said table against the grinding wheel, means for limiting the movement of said table toward the grinding wheel, and means for limiting the effectiveness of said first-mentioned resilient means in moving the table outwardly.

17. A grinding machine having, in combination, a grinding wheel, a shaft, a work supporting frame slidably mounted on said FREDERIO E. GARDNER.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,530,488, granted March 24, 1925, upon the application of Frederic E. Gardner, of Beloit, Wisconsin, for an improvement in Grinding Machines, errors appear in the printed specification requiring correction as follows: Page 3, line 20, for the Word projects read protects; page t, line 95, claim 5, strike out the Word cam, and line.97, for shiftable abutment read b10073; same page, line 127, claim 7, after the Word. on insert the Words the outer periphery of; page 5, line 2,'claim 7, after the article a strike out the Word cam; and that the said Letters Patent should he read With these corrections therein that the same may conform to the record of the case in the Patent Otfice.

Signed and sealed this 12th day of May, A. D. 1925.

[SEAL] KARL FENNING,

Acting Commissioner of Patents.

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