Патент USA US2118967код для вставки
i May 31, 193s. ,.-_ w_ CURWS A 2,118,967 CUTTER GRINDER Filed Oct. 17. 1934 2 Sheets-Sheet l Fig. l )g INVENTOR ATTORNEY May 31, l938._ F. W. CURTIS 2,118,967> CUTTER @BINDER Filed oct. 17, 1954 2 sheets-sheet '2_ 2,118,967 Patented Mayl3l, 1938 I UmuD-STATES PATENT " OFFICE 2,118,961 CUTTER dimmen >Frank W. Curtis, Wauwatosa, Wis., assigner to Kearneyv & Trecker Corporation, West Allis, Wis. Application october 11, 1934,~ serial No. 748,630 5 Claims. _ (Cl. 51-125) unit 3 provides a grinding wheel spindle 6 upon » which is mounted the rotor of van electric motor generally denoted by the numeral 1, and an abrasive grinding wheel 8 ñxed to the front end of -the spindleadjacent to the- cutter support. This invention relates generally to machine toolsand more particularly to. grinding machines. It is an object of the invention to provide a «grinding machine of a type particularly adapted 5 _for grinding milling cutters having improved ri gidity of support of the cutter to be ground and -the grinding wheel and an improved relation ship of supports for relative adjustment and for relative grinding movement of the cutter and 10 wheel. - ' . » ' The cutter supporting unît 2 includes various relatively movable supports as follows: slidably guided on base I_for reciprocatory movement in a path transverse to the axis of wheel spindle 6 ' is a cutter supporting slide or support 9 upon 10 . A further object is to improve thel mounting of the grinding wheel and its driving means, par ticularly in a manner to avoid or minimize dis tortion or displacement which might disturb the 15 desired relationship of the grinding Wheel and the cutter during the grinding operation, and in a manner to avoid vibration or chatter. A further purpose is generally to simplify and .improve the construction and operation of cut 2 O ter grinders and especially to provide an` im proved supporting structure for the grinding `wheel spindle and the cutter carrying spindle of a cutter grinder, and still other objects and ad vantages will be apparent from the description' 25 and claims herein. The invention consists of the construction and combination of partsv as herein-illustrated and explained, andin such modiñcation thereof as may be equivalent to the structure set forthV in 30 and deñned by the claims. The same reference characters have been umd to designate the same parts throughout the drawin-gs and description. ' In the drawings: 3_5 . - » Fig. 1 is a view in right-handside elevation oi ' a grinding machine in which the invention is in ` corporated. . Fig. 2 is an enlarged“ partial section and ele vational view of the same machine taken along 40 line 2-2 in Fig 1. Fig. 3 is a view in longitudinal section takenl along line 3--3 in Fig. 2, showing a portion of the lower structure. - > _ ’t Fig. 4 is a view in cross section taken along 45 line 4-4 of Fig. 1. s The’cutter grinding machine comprises a base I upon which is mounted a cutter supporting unit generally denoted by numeral 2, and a grinding which a cutter carrying bracket or support I0' is mounted to be adjustable angularly about a ver tical axis. Support I0 carries a cutter spindle support II slidably guided for vertical adjust-' ment, in which the horizontally disposed‘cutter - 5 carrying spindle 4 is rotatably mounted. Support 9 may be moved by the means of a hand crank, not shown, applied to the squared end -of screw I2 which engages a nut I3, and may be clamped in any- position of adjustment by a clamp screw 20 I4. Support I0 may be rotated by the means of ‘ a' crank, not shown,'applied to the squared end 'of a shaft I5, which turns a worm I6, engaging a Worm wheel I1 fixed on the lower- end of the support as best shovm in Fig.. 4, and may be vertically by the means of a hand crank, not shown, appliedl to the squared end of a screw 20. which engages with a nut 2 I, and may be clamped in any position of adjustment by the means of a -T-bo‘t 22. The spindle 4 may be rotated, as previ ously noted, by the hand wheel 5. This serves to turn the cutter mounted at the other end of the spindle in a step-by-stepOmotion to present 35 the diiïerent teeth of` the cutter to thegrinding. , Wheel successively for sharpening. To locate the individual teeth in the proper position of _ rota tion there is provided a tooth rest 23 4mounted for universal movement and adjustment about a rod 24 which in turn is pivoted in'a member 25_ slid ably adjustable on a member 26 fixed with the support II, the memberl 23 being clampable in any position of its adjustment by anyvsuitabvle means such as the bolts and nuts shown.- Abrasive wheel unit 3 includes various rela tively movable supports as follows: Slidably guided on base I for movement in a direction at right angles to the path of the cutter support 9 wheel unit generally denoted by numeral 3. Sup- . is a ñrst support or grinder supporting slide 21 ` porting unit 2 provides a rotatable cutter carry `upon which a second support or bracket 28 iS. ing spindle `4 which at the one _end is provided with a hand wheel 5 for rotation thereof,- and at the other end is provided with an exposed por tion upon which the cutter to be ground is mount edA for rotation coaxial with the spindle. Wheel 25 clamped in any position of adjustment by the means of T-bolt-s I8. Support II may be adjusted slidably guided for movement in a path at right angles to the path of movement of the ñrst support 21. Pivoted on support 28 for movement about a horizontal axis on a pivot pin 29 is a 55 . 2 2,118,967 grinding wheel spindle carrier or third support 30. 'I'he support 21 may be moved by a hand wheel 3| ñxed on a screw 32 engaging a nut 33 and may be clamped in any position of adjust ment by the means of a screw 34 operating sim ilarly to the clamp screw |4. 'I'he support 28 may be reciprocated by a hand wheel 36 ñxed on a shaft 31 upon which is also fixed a spiral pinion 38 engaging a rack 39 on the lower surface of 10 the second support 28, as shown in Fig. 3. It is this hand wheel 36 which is normally used for traversing the grinding wheel 8 relative to the cutter mounted on spindle 4. The support 30 15 may be manually shifted about the pivot 29 by grasping the support and shifting it bodily, but for ñne adjustments there is provided supple mental adjusting means best shown in Fig. 2 in cluding a screw member 40 pivoted on a clamp ing bolt or stud 4| ñxed in the support 3D and 20 which works in an arcuate slot 42 in the support 28. Screw 4|) is threaded and is provided with a hand nut 43 bearing on an ear or lug 44 fixed with support 28. As the hand nut 43,15 turned the support 30 is moved in the one or the other 25 direction about pivot 29. Support 30 maybe clamped in any position of its pivotal adjustment by a nut 45 on the stud 4|, a similar clamp stud 46 and nut 41 being provided at the other side of the support. The supporting arrangement is such that universal adjustment is provided between a cutter being sharpened and a cooperating grind ing wheel by mechanism having only four suc cessive pairs of relatively movable bearing sur faces interposed between said cutter carrying spindle and said base, and likewise only four suc cessive pairs of relatively movable bearing sur faces interposed~ between said grinding wheel spindle and said base. The third support 30 is formed in two pieces, race 64 carried by the support portion 49, and interposed anti-friction ball elements 66. This bearing prevents lateral displacement or whip ping of the rear end of the spindle 6. A flywheel or inertia member 66 is fixed on spindle 6 at a point between bearings 60 and 5| for reasons more particularly pointed out in a copending application of Joseph B. Armitage, Serial No. 750,440, tiled October 24, 1934, which is directed to this feature of the mechanism. A spindle brake generally denoted by numeral 61 may be used for quickly stopping the spindle. Brake 61 includes an arcuate member 68"’best shown in Fig. 2, having a ’pivot 69 supported from the member 48. A brake band segment 10 is ilxed 15 on member 68 in a position to engage the periph ery of ñywheel 66. A hand operable button mem ber 1| is connected to the member 61 by a mem ber 12 and serves to permit the operator to engage the brake and quickly stop rotation of 20 spindle 6 when desired, the brake being normally held disengaged by a spring 13. The power for rotation of spindle 6 is derived from a self-contained primary motion motor which may be of any suitable form or type in 25 cluding a rotor member 14 which is fixed on spindle 6 at a point between the intermediate bearing 5| and the rear bearing 52. The motor stator element 15 is ñxed with the portion 49 of the third support in manner to'be removed to 30 expose the rotor when the portion 49 is removed. 'I'he position and relationship of the motor mem bers relative to the grinding wheel and spindle bearings has been found to be of material bene ñt in improving the action of the grinding wheel, 35 particularly in maintaining a constant speed, and in reducing vibration or chatter. What is claimed is: removably attached motor housing portion or 1. In a cutter grinder, the combination of a base, a grinding wheel spindle and a cutter spin 40 member 49. The portion 48 carries a front anti wheel spindle support means including a ñrst 40 there being a main portion or member 48 and a friction bearing 50 and an intermediate anti friction bearing 5|. 'I'he portion 49 carries a rear 45 anti-friction bearing 52. 'I'he front bearing 50 includes aninner race 531 shouldered against an enlarged portion of spindle 6 at 54, an outer race 55 shouldered against the support member 48 at 56, there being a plurality of interposed 50 anti-friction ball elements 51, the bearing being adapted to restrain both rearward axial and lat eral movements of the spindle. Theintermediate bearing 5| includes an inner race 58 which is slidably fitted to spindle 6, an outer race 59 which 55 is shouldered against support member 48 at 60, and a plurality of interposed anti-friction ball elements 6|, this bearing being adapted to re strain both forward axial and lateral movements of the spindle. The inner race '58 may be ad 60 justed along spindle 6 by the means of a nut 62 threaded on the spindle and the form of thevarious races and interposed anti-friction ball elements of the bearings 5II, 5| is such that adjustment of nut 62 serves to remove all slack in both these bearings and thereby to tix Athe spindle 6 against axial movement in either di rection and against lateral movement at either end. A slight further tightening of nut 62 sets up an initial or preloaded condition of each of' 70 the bearings 50 and 5|', which serves to minimize die-each rotatably supported from said base, and support slidably supported from said base for movement toward and from said cutter spindle, a second support slidably supported from said 45 base for reciprocatory movement in a path trans verse to the path of movement of said :ñrst sup port and a third support pivoted for movement about a horizontal axis transverse to the axis of said wheel spindle, said wheel spindle being journaled in said third support and vadjustable about said axis to various positions including a substantially horizontal position, and power means for driving said wheel spindle including a primary motion motor device providing a rotor 55 ilxed with said wheel spindleand a stator iixed with said third support. ` 2. In a cutter grinder for sharpening face milling cutters, a base, a cutter supporting slide mounted .on'said base for horizontal linear ad 60 justment, a grinder supporting slide mounted on said base for horizontal linear adjustment to wards and from said cutter slide at right angles to the line of adjustment of said cutter slide, a cutter carrying bracket pivotally mounted on said 65 cutter _slide for angular adjustment in a hori zontal-fplane, a cutter spindle support mounted for vertical linear adjustment on said cutter carrying bracket, a cutter carrying spindle jour naled'horizontally in said cutter spindle support, 70 or prevent any displacement of the spindle as the - means for turning said spindle about its hori grinding load increases or decreases and to pre zontally disposed axis to present the~ blades of a ' vent'chatter or vibration of the grinding wheel. cutter carried thereby successively for sharpen ` 'I'he rear- bearing 52.includes an inner race 63 75 in »which the spindle 6 is slidably ñtted, an outer ing, a grinder supporting bracket mounted on said grinder slide for lineal traverse at right angles to 2,1 18,967 the direction of adjustment of said grinder slide,y in manner 3 to clamp said grinding unit to said y 'a grinder spindle support pivotally mounted on supporting element, an adjusting screw pivotally said grinder supporting bracket for angular ad justment in a vertical plane, a grinding wheel spindle journaled for rotation in said grinder spindle support, a grinding wheel iixed to the end of said grinder spindle in cooperating relation ship with said cutter supporting spindle, a iiy mounted on one of said clamping bolts outside of wheel iixed on said grinder spindle, a self-con 10 tained driving motor directly connected to said grinder spindle, said grinder spindle and con nected grinding wheel ñywheel and driving motor together with said spindle support being mov able as a unit in adjusting the position of said 15 grinding wheel and in traversing said wheel in grinding relation with a cutter supported in said cutter supporting spindle, the supporting ar rangement being such that there are four suc cessive pairs of relatively movable bearing sur 20 faces interposed between said grinder spindle and said base and likewise four successive pairs of relatively movable bearing surfaces interposed between said cutter spindle and said base. _3. In a cutter grinder forgrinding face milling 25 cutters, the combination with a base and means on said base to support a cutter with its axis' in horizontal position and adjustable angularly and said supporting element, a l'ug on said supporting element having an opening for receiving said adjusting screw, and a manually operable. ad justing nut threaded >on said adjusting screw and disposed to engage said lug- to adjustably posi tion said grindingv unit angularly for clamping by said clamping bolts in predetermined angular position. ‘ . 5. In a cutter grinder for sharpening face mill ing cutters, including a base; the combination with a cutter supporting slide mounted o'n said base `for horizontal linear adjustment, a cutter 15 carrying bracket pivotally mounted on said cutter supporting slide for angular adjustment in a hori Zonta] plane,„a cutter spindle-support mounted for vertical linear adjustment on said cutter carrying bracket, and a cutter `carrying spindle 20 journaled horizontally in said cutter spindle sup port in position to present the blades of a cutter carried thereby _for sharpening; of a grinder sup porting slide mounted on said base for horizontal , linear adjustment towards and from said cutter 25 carrying spindle in direction at right angles to the line- of adjustment of said cutter supporting vertically; of a grinding unit’mounted on said slide, a grinder carrying bracket mounted .on base including a grinding spindle and a grinding Y said grinder supporting slide for lineal traverse 30 wheel a ñywheel and a driving motor rotor mount ed on said spindle, a support pivotally carrying said grinding unit for angular adjustment bodily in a vertical plane said support including a co operatingv motor stator, a screw and nut mech 35 anism for positioning said grinding unit angu larly relative to said support, and clamping means for retaining said grinding unit in predetermined angular position. ’ 4. In a cutter grinder, a base, means on said base for holding a cutter in position to be ground, a grinding unit including a grinding wheel and a driving motor carried -by said base and operable to grind a cutter, a supporting element pivotally supporting said grinding unit on Said base for 45 angular adjustment in a vertical plane said sup porting element having arcuate slots at each side thereof, clamping bolts extending from each side of said grinding unit through said arcuate slots ‘ at right angles to the direction of adjustment of 30 said grinder supporting slide, a grinder spindle support pivotally mounted on said grinder carry ing bracket for angular adjustment in a vertical plane, and a »grinding wheel spindle journaled for rotation in said grinder spindle support in posi 35 tion to present a grinding wheel f_or cooperating with- a cutter carried by said cutter carrying spindle; the supporting arrangement being such that universal adjustment is provided between a cutter being sharpened and a cooperating grind ing wheel by mechanism having only four suc cessive pairs of relatively movable bearing sur- y faces interposed betweenv said cutter carrying spindle and said base and likewise only four suc cessive pairs ,of relatively movable bearing sur faces interposed between said grinding wheel ‘_ spindle and said base. FRANK W. CURTIS.