US1905224A - Grinding machinery - Google Patents

Description

April 25, 1933. F. s. HAAs Er AL GRINDING MACHINERY Filed Sept. 27, 1929 3 Sheets-Sheet l April 25, 1933. F, 5' HAAS ET AL y 1,905,224

GRINDING MACHINERY Filed Sept. ZZ, 1929 3 Sheets-Sheet 2 Mom/L d tto: um,

April 25, 1933. F. s. HAAs ET AL GRINDING MACHINERY Filed sept. 27, 1929 5 Sheets-Sheet 5 ano/r 11411 I Patented @apn 25, 1933 maar Parana#v orrica FREDMEGK HAM LEHENT BOOTH, OF CINCINNATI, OHIO, ASSGNORS TO CIN- g CENNATI QRXNDERS INCORPORATED, QF CINCINNATI, Omo, A CORPORATION OF OEE@ GRINDINe MACHINERY .Application tiled September 27, 1929. Serial No. 395,703. i

provision of a vmechanism capable of manual or other control which will enable a rela'- l tively unskilled operator to successfully produce a smooth properly trued surface on an abrasive wheel without the formation of grooves or ridges or the like and without liability of injury to the diamond or other truing tool employed.

A turther object of the invention is the provision of an improved manually controllable truing mechanism for grinding Wheels or the like vvhichwill relieve the operator.

of the laborious hand actuation thereof and which will be capable of shifting through full or limited strokes as desired and large varying rates of speed according to the work being performed at an individual moment.'y

An additional object of the present invention is the provision of an improved automatic mechanism 'for attaining; proper relaa tive feeding movement ofthe tool with re spect to the surface being operated upon at each traverse thereoi whereby uniformity of truing" and liability oi deep setting causing either gauging of the wheel or damage to the diamond of truing tool to be prevented'. Other objects and advantages of the present invention should be apparent by reference to the following. specification considered in conjunction .with the appended drawings forming apart thereofand it will be understood that we may make any modifications in the speciiic structural details hereinafter disclosed within the scope of the appended claims Without departing from or exceeding the spirit of the invention. i

Figure lis a side elevation of a grinding machinel equipped with our improvements.

Figure 2 is a top plan view thereof.

Flgure 3 is a. transverse sectional view taken on the line 3 3 of Figure 2.

- Figure 4 is a vertical section as'on the line 4-4 of Figure 1.

Figure 5 is a section on line 5 5 of F igure 4. y Figure 6 is a section through the actuating lever and parts affected thereby as on line 6 6 of Figure 1. l

Figure 7 is av vertical section on the line 7 7 of Figures 2 and 3.

Figure 8' is a vertical section on yline 8 8 of Figure 7. `i

Figure 9 is a horizontal section vthrough the feed piston on line 9 9 of Figure 8, and

Figure 10 is a diagrammatic view of the hydraulic control circuit and parts actuable thereby.

Y in the drawings infwhich similar charactcrs of reference vare employed to denote corresponding views the numerall designates the bed of a centerless grinding machine having a head 16 in which is journaled the grinding wheel 17 actuable in a clockwise direction for operation onthe/work piece 18 supported by Work rest 19.

The present invention has been shown as applied to and utilized i-n cdnjunction with the grinding wheel Jmember of a machine of this type since due tothe requirements as to Aaccuracy of production of Work upon centerless grinders the truing of the grinding Wheel isof maximum importance.

Suitably supported by the bed 15 is a bracket 20 bearing a trunnion 21 for the suppemental truing fixture bracket 22 secured in angularly adjustable position as by bolt 23. This bracket supports the guide'block 24 having the dove-tailed ways 25 on 1which is slidably mounted the tubular'housing 26 for the truing tool.

Member 24 has a projection 27 forming a same from opposite ends of the cylinder to effect desired reeiprocation of piston 29. This piston is coupled by a rod 33 with slide 26 for actuation of' the slide.

Conduits 31 and 32 terminate at the valve housing 34 containing the suitably ported bushing 35 and slide valve 36. An inlet 37 extends to the housing and is in communication with the interior of bushing 35, suitable actuating fluid being supplied thereto 'from reservoir 38 as by intermediately disposed pump 39. Depending from the housing is an outlet or discharge conduit 40 adapted to return fluid from the system to the reservoir. The valve member 36 has a spool portion 41 engaged by arm 42 on rock shaft 43 j ournaled in the valve, and having pivotally secured to its outer end the actuating handle or lever 45.

A spring 46 tends to normally urge valve to a left hand positionas viewed in Figure 5, in which the porting then serves to couple the left hand end of the piston with the discharge port and the right hand end with the pressure so that the actuating pressure will hold the piston and thus the truing slide unit toward the rear of the machine in a normal, inoperative position.

When it is desired to effect a truing operation handle 45 is shifted to move the valve to the right causing the connections to be reversed so that the actuatingr fluid flows from the valve through conduit 32 to the outer end y of the piston while the inner end of the piston is coupled through conduit 31 and the valve through a discharge passage 47 in the housing. This passage includes a seat 48 for a chuck valve 49. This valve is intermediately located on the stem 50 having its terminal portions journaled in the packing nuts 51-52 to prevent leakage of the actuating fiuidl The stem being supported for both sliding and retarding movement. Nut 51 is carried by a sleeve nut 53 having a cylindri l cal portion 54 supporting and guiding the spring 55. A bushing 56 is slidably but nonrotatably mounted in the aperture 57 int-criorly of the member 53 and is urged against shoulder 58 by action of the opposite end of spring thereagainst. Stem 50 has a threaded portion 59 engaged with the bushing whereby the stem may be adjusted relative the bushing, the engagement of the bushing and shoulder determining the inward limit of movement of the valve under iniuence of spring 54. These parts are movement of the piston and thus of the truing tool in either direction.

By reference to Figures 4 and 6 it will be noted that the stem 50 projects rearwardly from the housing and has its terminus resting against the intermediately pivoted lever member 61 whereas the opposite end is engaged by pin 62 andl projected by engage ment of the inner face of yoke 63 forming the pivotal connection between shaft 44 and operating handle or lever 45.

Consequently, when lever 45 is pushed inwardly or in a direction toward the machine motion will be transmitted thereby through pin 62 to rock lever 61. This in turn will pressvalve stem 50 toward the front sliding bushing 56 forwardly against the pressure of spring 55 thus releasing the choking in the discharge line. This results in a rapid traverse of the piston and associate tool and it will be understood that the width of yoke 63 is such that the lever may receive the necessary valve eecting oscillationjwhile still holding the pin depressed.

Consequently, continuous or in turn rapid traverse may be effected and in either direction as the desired single lever controlling the directional movement of the truing tool slide and also the rate at which the operation is effected. I

In order that the operation of the entire machine may be as near entirely automatic as posible means are provided not only for power reciprocation of the truing sliele but also for au automatic inward feeding of the tool a predetermined amount for each cycle of reciprocation thereof. mechanism proper is illustrated in sect-ion in Figure 7 and includes the tool holder or plunger 64 bearing at its inner end the truing tool or diamond 65. This member is keyed as at 66 against rotation relative the support 26 therefore and has a threaded socket as at 67 to receive adjusting screw 68, Screw 68 has a flange 69 bearing against the under side of cap 70 carried by the outer portion of the casing 26 and on its outer projecting end bears a hand wheel 71 for rotative adjustment of the screw. This hand wheel has a hub 72 bearing against a cap 73 on the outer end of the housing forming the remainder of the swivel movement of the screw and preventing longitudinal movement. Cap 70 has a vprojecting sleeve portion 74 circumscribing the outer portion of the lscrew and forming a bearing for the oscillatable rack member 75. This member as is clearly illustratcd in Figure 8 supports a pivot pin 76 The truing tool intermediately engaging pawl 77 having at idly in a reverse direction and a second pin 80 serves as a support for spring 81 normally urging the pawl into engagement with the ratchet. An adjustable supply screw 33 is carried by the member 26 and projects into the path of movementinto the rearward or spring engaged portion for engagement' of these parts upon reverse oscillation of the pawl which tends to cam the pawl inward out of engagement with the ratchet and the point of release. Thus re-engagement oi the pawl and ratchet on reverse movement of the pawl may bedetermined and thus the amount of shift of the ratchet may be determined by adjustment of the screw 83. The ratchet in question is keyed on the intermediate portion of the screw so that shifting of the ratchet will correspondingly advance the screw therewith imparting a slow inward feeding movement to the truing diamond.

inasmuch as in its reverse position the pawl is held back away from the ratchet the screw may additionally be given manual adjustment in either direction as desired.

For electing the automatic adjustment a cylinder chamber 85 is formed in the member 26 receiving and guiding piston 86 having a rack 87 meshing with the teeth on the pressure of the slidable pawl carrier Z7 so that on retraction of the piston an oscillatory movement will be imparted to the pawl. The degree'Y of feeding movement oi each oscillation may further be controlled by adjusting the end stop members 88 and 89 which have a suitable screw or threaded mounting for this purpose as shown in Figures 8 and 9. The less the movement allowed the piston in a left hand direction the less the feeding movement which will be given to the screw upon each individual actuation of the piston. It will be noted by reference to Figures l and l0 that the leads or conduits A90 and 91 to the cylinder 85 are coupled respectively with the leads 31 and 32 with the cylinder 28. Consequently, the piston 86 will be moved to the right as viewedlin Figure 8 when the piston 29 is moved to the left as viewed in Figure 3 the path being retracted r or shifted toward the rear of the machine within the lateral point grinding wheel so same is set to true oli' the surface of theI wheel so that the wheel is worn greater at the front than at the rear side. rlhe tool may be taught to traverse the wheel until the stock and control 35 is pressed inward causing a rapid reverse or `return movement of the tool on account of relieving for opening of the throttle valve 49.

This also carries the pawl back in a position to take another feed bite on the screw ratchet. When the machine is reversed the tool is again movedl inward and adjusted the predetermined increment and is then caused to traverse the grinding wheel surface at the rate determined by the lever 35.

From the foregoing description the operation of the present improved invention should be readily understood and it would seem the operator is relieved oi the necessity of slow hand traversing of the diamond and .the additional necessity of manual determi- Sti n addition., the truing tool is automatically fed in once tor each cycle et back and forth movement of the tool. irrespective ot the extent of such movement and in any event, is given but one feeding movement for each reciprocation. lltwill ot course be understood that by a jiggling of the lever 'the piston could be relatively shifted to reduce several operative actuations et the eed control system without bringing the tool into engagement with and transversely of the grinding wheel surface and likewise that such desired' additional adjustment could be procurred as preferred by a manual adjustment of the truing tool by rotation oi" handle 71 and thus associate screw without actuation of the hydraulic mechanism;

We claim z;

l. A mechanism ot the nature described including a support, a slide movable traversely of the support, a tool holder movable transversely of the slide, a piston for actuation yof the slide, a second piston for actuation of the tool holder, respective cylinders operatively supporting the pistons, a source of hydraulic power, and means for simultaneously coupling the source of power with one end or l the other of each of the cylinders for simultaneous actuation ot the feed and traverse controlling pistons whereby the tool is incremently fed toward a grinding wheel at the initiation of the movement of the slide.

2.A ln a truing mechanism of the class described tor operation on an abrasive wheel, the combination of a supporta slide traversely movable on the support, a holder carried by the slide, hydraulically actualole means for effecting a traversing movement of the slide, hydraulically actuable means for e'ecting a continuous incremental iceding of the holder with respect to the slide, an hydraulic circuit for the hydraulically actuable means including a start and stop valve, a throttle mechanism for normally retarding the rate ot actuation of the parts including a valve, and a single control niember for determining the eiiective position of both of said valves.

3. In a truing mechanism of the character described for operation on au abrasive Wheel, the combination of a support, a slide traversely movable on the support, a holder carried by the slide, hydraulically actuable means :tor eecting a traversingmovement of the slide, hydraulically actuable means for eiiecting a continuous incremental feeding of the holder with respect to the slide, an hydraulic circuit for the hydraulically actuable means including a start and stop valve, a throttle mechanism for normally 'retarding the rate of actuation ofthe parts including a valve, and a single control member actuable in one direction to determine the direction of movement of the traversing and feeding mechanisrns and in a different direction to effect the rate of actuation thereof.

4l. ln a truing mechanism of the character described for operation on the active face of an abrasive wheel, the combination with a support, of a slide movable thereon, a trueing tool carried by and movable relative to the slide toward the abrasive wheel, hydraulically actuable means for traversing the slide, additional hydraulic means for advancing the tool relative to the slide at incremental rates, and means controlling the actuation of the parts by the hydraulic means for movement at feed and quick traverse rates.

5. ln the machine tool organization the combination of a bed, a grinding wheel rotatably supported thereby, a bracket adjacent the grinding wheel and having a guide way thereon, a slide supported by the bracket and movable longitudinally of the guide way, Y

a truing tool holder on the slide and movable transversely thereof, an hydraulically actuable piston operatively connected with the slide for shifting same, an hydraulically actuable piston for moving the truing tool holder, a hydraulic pressure source, conduits therefor extending to the pistons, a single valve controlling the flow of the pressure source through the conduits, and a control member mounted on the bed for actuating the valve.

6. In the machine tool organization the combination of a bed, a grinding Wheel rotatably supported thereby, a bracket adjacent the grindinglwheel andy having a guide way thereon, a slide su ported by the bracket and movable longitudinally of the guide way, a trning tool holder on the slide and movable transversely thereof, an hydraulically actuable piston operatively connected with the slide for shifting same, an hydraulically actuable 'iston for moving thetruing tool holder, a ydraulic pressure source, conduits therefor and extending to the pistons, a single s Leonesa valve controlling the iow of the pressure source through the conduits, a control member mounted on the bed for actuating the valve, a throttle mechanism including a second valve for controlling the rate of flow of the pressure source, and means connected with the control member for actuating the throttle mechanism valve whereby a common control for the direction and throttle valves is provided.

.7. In the machine tool organization the combination of a bed, a grinding wheel rotatably. supported thereby, a bracket adjacent the grinding wheeland having a. guide way thereon, a slide supported by the bracket and movable longitudinally of the guide way, a truing tool holder on the slide and movable transversely thereof, an hydraulically actuable pistou operatively connected with the slide for shifting same, an hydraulically actuable piston for moving the truing tool holder, a hydraulic pressure source, conduits therefor and extending to the pistons, a single valve controlling the tiow of the pressure source through the conduits, a control member mounted on the' bed for actuating the valve, a throttle mechanism including a second valve for controlling the. rate of flow of the pressure source, 'means connected with the control member for actuating the throttle mechanism' valve whereby a common control for the direction and er, a hydraulic medium un'der pressure, a

pair of conduits for the medium, said conduits being branched at one end thereof and respectfully connected with the slide and truing tool holder pistons whereby they are simultaneously actuated, and a single valve for directing the hydraulic source to either conduit for actuating the pistons simultaneously in either direction.

9. In a device of the class described'the combination of a rotatable grinding wheel, :1 support adjacent the actiue tace of the grinding wheel, a slide on the support and movable traversely thereof, a truing tool holder on the slide andinovnble transversely ofthe slide, hydraulically actuable pistons for actuating the slide and truingtool holder, a hydraulic medium under pressure, a

pair of conduits for the medium, said e011-,

duits being branched at one end thereof and respectfully connected with the -slide and monaca 'simultaneously' actuated, a single valve for directing the hydraulic sourceto either conduit for actuating the pistons simultaneously in either direction, a second valve in one of the conduits for varying the rate of flow of the hydraulic medium therethrough and consequently varying the rate of movement of the slide or truing tool holder, and a levercommon to both valves rand shiftable in different directions for controlling the' said valves. y v

l0. ln a device of the class described the combination of a. rotatable grinding Wheel,

asupport adjacent the -active face of the grinding wheel, a slide on the support and movable traversely thereof, a truing tool holder on the slide and movable transversely oi the slide, hydraulically actuahle pistons for actuating the slide and truing tool holder, a hydraulic medium under pressure, a pair oi conduits for the medium, said conduits being branched at one end thereora and rel spectiully connected with the slide and truing tool holder pistons whereby they are simultaneously actuated, a. single valve for diel rooting the hydraulic source to either conduit for actuating the pistons simultaneosuly in either direction, a second valve in one of the conduits for varying the rate of flow ci the hydraulic medium therethrough and concombination oi a bed, a grinding wheel ron tatably mounted thereon, a guideway adjacent the grinding Wheel and extending transversely thereof, a slide mounted thereon for movement relative thereto, atruing, tool mounted on the slide for movement toward the grinding wheel, hydraulic means for shifting the slide, a screw carried by the slide having an operative coupling with the tool, a reciprocating rack supported by the slide, a segmental gear journaled on the slide and operatively coupled with the rack, a

' ratchet secured to the screw, and a paWl on the segmental gear Jfor engagement with the rack whereby reciprocations of the rack and oscillations/,of the gear through the ratchet and pawl incremently feed the tool toward the grinding wheel for each reciprocation of the rack.

l2. ln a machine tool organization the combination of a bed, a grinding Wheel rotatably mounted thereon, a guidetvay adjacent the grinding Wheel and extending transversely thereof, a slide mounted thereon for movement relative thereto, a truing tool mounted on the slide *for movement toward the grinding ivvheel, hydraulic means for shifting the slide, a screvv carriedloy the slidehaving an operative coupling vvithV the tool, a reciprocating rack supportedloy the v slide, a segmental gear journaled on the slide an'd operatively 'coupled with the raclr, a ratchet secured to the screw, a pawl on the segmental gear for engagement with the raclr whereby reciprcations ofthe raclr and oscil-I lations of the` gear through the ratchet and `liti pawl incremently feed the tool tov/'ard the grinding wheel or each reciproc'ation oil rack, means for disengaging the 'ratchet 'and vpawl when the rachis at one end oi its move nient, and manual' meansl'or actuating the screvv when the ratchet and pavvl are disen gaged. I

13. lln a machine tool organization' the combination of a hed, a grinding vvheelnoa tatably mounted thereon, a guidevvay adjap cent the grinding wheel and extending trans versely thereof, a slide mounted thereon :lor movement relative thereto, a truing tool mounted on fthe slide for movement toward the grinding wheel, hydraulic means rior shifting the slide, a screw carried by the slide having an operative coupling with the toch/a reciprocating rack supported by the slide, a segmental gear journaled on the slide and operatively coupled with the rack', a l.

ratchet secured to the screw, a parvl on ,Sill

segmental gear .for engagement vvith the racl whereby reoiprocations of the raclr and oscillations of the gear through the ratchet and pawl incremently feed the tool toward the grinding Wheel for each reciprocation of the'raclr, and hydraulic means for reciprou eating the rack,

y il.. ln a truing mechanism ci the classde scribed the combination `with a grinding Wheel, of a slide support adjacent the grirnla ing Wheel, a slide on the support tor tranela-i v tion relative thereto, a truing tool mounted on the slide for movement toward the grinding lll@ wheel, an hydraulic piston connected vvith'lv the slidean hydraulic piston for feeding the tool toward the grinding Wheel, a single source of hydraulic pressure for actuating said pistons, a conduit extending from the single source of pressure to one end oil each piston, a valve in said conduit for reversing the dow of the pressure through the conduit, a second valve for controlling the rate oil flow ofsaid pressure in said conduit, means for adjustably determining the position oi said rate control valve, a lever operable in one direction for axially shifting said reversw ing valve, and means connecting said lever with the rate control valve whereby operation thereof in an angularly related direction ren-a ders .the adjusting means inoperative..

l5. ln a truing mechanism oit the class described. the combination with a grinding wheel, of a slide support adjacent thegrindn ing Wheel, a slide on the support for inanslau ldti tion relative thereto, a truing tool mounted on the slide for movement toward the grinding wheel, an hydraulic piston connected with the slide, an hydraulic iston for feeding the tool toward the grind,

source of hydraulic pressure for actuating said pistons, a conduit extending from the single source of pressure to one' end of each piston, a valve in said conduit for reversing the flow of the pressure through the conduit, a second valve for controlling the rate of flow of said pressure in said conduit, means for adjustably determining the position of said rate control valve, a lever operable in one direction for axially shifting said revers ing valve, and means connecting said lever with the rate control valve whereby operation thereof in an angularly related direction -renders the adjusting means inoperative, said connection comprising a plunger abutting onV one end with the lever and on the other end with a pivoted beam, and a. second plunger abutting on opposite ends with the beam and rate control valve.

In testimony whereof we aliix our signa- FREDERICK s. HAAS. CLEMENT BoofrH.

lng wheel, a sin le

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