US2124491A - Tool operating mechanism - Google Patents

Description

July 19, 1938. GQ H. rI I-:LAND

TOOL OPERATING MECHANISM 2 Sheets-Sheet 2 /NVEN TUR; @50H55- L EL. AND.

Patented July 19, 1938 UNITED STATES TOOL OPERATING MECHANISM George H. Leland, Dayton, Ohio, assigner to The Leland Electric Company, Dayton, Ohio, a corporation cf Ohio Application September 9, 1935, Serial No. 39,664

11 Claims.

This invention relates to a tool operating mechanism and is designed more particularly for facing the end of a bearing or the like.

One object of the invention is to provide a mechanism for so operating a rotatable tool that it will be caused to move gradually across the face of the work on a constantly changing radius.

A further object of the invention is to provide such a mechanism in which the tool will rotate simultaneously about a xed axis and about a second axis which is movable transversely to vary the radius on which the tool rotates.

A further object of' the invention is to provide such a mechanism in which the rotation of the tool will be automatically stopped at the end of each complete cycle of operation.

A further object of the invention is to provide such a mechanism which will comprise a small number of parts and in which the several parts will be of such a character that they will not be easily broken or disarranged.

Other objects of the invention will appear as the mechanism is described in detail.

In the accompanying drawings Fig. l is a longitudinal sectional view taken centrally through a mechanism embodying my invention and partly broken away; Fig. 2 is a transverse sectional view taken on the line 2-2 of Fig. 1; Fig. 3 is a longitudinal section taken centrally so through a modified form of the mechanism, partly broken away; Fig. 4 is a front end elevation of the same; Fig. 5 is a section taken on the line 5 5 of Fig. 3 and looking in the direction of the arrows a; Fig. 6`is a section taken on the line 5 5 of Fig. 3 and looking in the direction of the arrows b; and Fig. 7 is a detail View of a portion of the inner shaft.

In these drawings I have illustrated one embodiment of my invention, together with a minor o modication thereof, and have shown the same as designed for facing the end of a motor bearing but it will be understood that these particular embodiments have been chosen for the purpose of illustration only and that the mechanism 4.5 may take various forms and may be used for various purposes without departing from the spirit of the invention.

In the particular embodiments of the invention here illustrated the work is carried by a 50 work support which is stationary during the operation of the tool. The work illustrated comprises a bearing 5 mounted in the end frame 6 of a motor and this end frame isclamped or otherwise secured to the work support l. The

55v particular work support shown in Fig. 1 is of that type which is arranged between two tools and is moved first in one direction to cause one operation to be performed upon the work and is then moved in the other direction to cause another operaticn to be performed upon the work. 5 i Such a work support is well known in the art and need not be illustrated or described in detail. It will be noted that as here shown the work is clamped on that side of the work support opposite or remote from the tool operating 10 mechanism and the work support has a central opening 8 to permit the same to be moved past the tool so that the latter may project beyond the work support and engage the work.

In the construction here illustrated the mem- 15 ber whichsupports the tool is mounted for rotation about a fixed axis coincident with the center of the work which is to be faced and is movable transversely to that axis to move the tool across the work. A second member is rotated 20 simultaneously with the tool supporting member but at a different speed and the two members have cooperating parts controlled by the relative rotation of said members to impart transverse movement to the tool supporting member. Preferably the two members rotate about parallel axes, which may be coincident or spaced one from the other, and the second member has an eccentric part to impart transverse movement to the tool supporting member and thus gradually change the radius of the tool as the latter rotates about said xed axis.

In the construction shown in Figs. 1 and 2 the mechanism comprises two rotatable members mounted one within the other and simultaneously rotated. The outer or bearing member 9 is journaled in bearings I0 mounted in a tubular main frame lila and is rotatable about an axis arranged in alinement 'mth the center or axis of the work piece. This bearing member 40 has Va longitudinal bore I! arranged eccentrically with relation to its axis and forming a bearing in which is mounted a tool lsupporting memberV i2. In the present construction, both members are of elongate form and may be referred to as shafts and the eccentric bore Il extends for the full length of the bearing member 9. It will be obvious, however, that the two members may be of any suitable size and shape and may be mounted in any suitable manner. The tool supporting member. l2 has at its forward end means, such as a chuck I3, for supporting a tool i4. As here shown, this tool is provided with a cutting edge i5 which is moved across the end of the bearing to face the same and vis alsoprovided with a second cutting edge K n Y described the operation of the mechanism is in- |6 adapted to engage the innerv edge of the bearing face and chamfer the same. The two membersS and I2 are rotated simultaneously about their respective axes and the tool supporting member will rotate not only about its own axis but also about the axis of the bearing member 9. The two members are rotated at slightly different speeds, the .bearing member preferably having the greater speed, and as the bearing member Vrotates with relation to the tool supporting member the eccentricity of its bore continuously varying the Alength of the radius of the tool I44 and causing the cutting edge I5 to move slowly across the.=face ofthe work r5.

VAt or about the time the cutting edge I5 com-V plet'es the facing of the work the cutting edge i5 Yof the tool will engage the inner edge of the work and cut away or chamfer a corner of the bearing v5. When the bearing member has rotated through an arc of with relation to the tool supporting member the axis of the ktool supporting member will have traveled in a curved path about the axis of the bearing member from one side of that axis to the other side thereof and .the tool willv have reached the limit' of its transverse movement. the bearing member with'relation tothe tool supporting member will return the tool to its neously and a variation of speed may be secured in any suitable manner. In the present instance I have employed a gearY drive and have shown aV spur gear IV'I rigidly secured to the `bearing member 9 near that end opposite the tool and meshing with the gear I8 rigidly secured to the shaft I9 of an electric motor 20, a portion only of which is shown.V A second 'gear 2| is mounted on the rear end of the bearing member 9 for rotation with relation thereto and is so connected with the tool supporting member I2 as to cause the latter to rotate therewith but to permitY the Atool supporting member to have movement transverse to its axis with relation to the gearV 2|. arrangement shown the gear 2| is provided with a stud 22 which extends into a slot 23 in a `plate 24 rigidly secured to the end of the tool supporting member I2. This second gear 2 I `meshes with a second gear 25 rigidly secured tothe motor shaft I9,V The two -gear trains are of different ratio so that the two members will be rotated at and the gear 25 with one'tooth less than YtheV gear I8.. For example, by providing the Ygear I'I with sixty-one teeth and the gear 2| with sixty teeth and providing the gearr|8 with fifty-five Y teeth and the gear -25 with fifty-four teeth the bearing Ymember 9 will be caused to makeV five hundred and fty rotations while the tool'supporting member I2 makes Vfive hundred and forty-nine rotations. The bearing member will therefore have made one complete rotation with relation to the tool supporting member vand theY tool will have been moved from its initial position to the limit of its. movement Vand back toits initial position and during Athis lateral movement it is rotated constantly about the xed axis'of the bearing member 9.

The further rotation ofY In the work support and I prefer that the interruption of the operation shall be automatic so as to prevent the possibility of the tool again moving over the face of the work. 'I'he rotation of the members `9 and .I2 may be interrupted in any suitable manner lbut when, as in the present instance, the

vmechanism is electrically driven I prefer to interrupt the rotation of the two members by'stopping lthe motor, Vas by automatically opening a construction the switch is shown as a mercury Itube switch `26 which is pivotally mounted in a housing 21 carried by the main frame Ia and has connected therewith an operating handle 2B which extends to the exterior of the housing 21 to enable -the switch vto be manually moved to its closed position, it being shown yin the drawings mits .open position.V The -operating handle .2.8 extends Ybelow 4the switch and is pivotally Vconnected with the adjacent end of a lever 29 which` is pivotally mounted between its ends, .preferably on a block of insulating vmaterial 30, and extends through an opening 3| rinto the tubularframe member I-a where it is operatively connected vwith a device carried by the bearing member .9. In the present construction this device comprises a. sleeve 32 slidably mounted on the bearing member 9 but held againstrotation with relation Vthereto and this sleeve is provided with 4a circumferential vgroove 33 to receive the .end of a lever y29 which is preferably provided with a roller V34.V A spring .S5-acts on the sleeve 32 to move the same rearwardly, that is, in ya direction to Vmove the switch 26 toits open position. The

sleeve 32 and the tool supporting member 2 have cooperating parts controlled by the relative movements of the bear-ing member 9 and the tool supporting member I2 to control lthe movement of the sleeve by the Spring35. In the construction'illustrated a springl lpressed plunger 36 is mounted inthe sleeve and extends through a slot l31 in the wall of lthe tubular bearing member 9 into the bore of that member. porting member is provided with two circumferential grooves 38 and 39 which are connected one to the other by a'longitudinal.groove-4|). The rear circumferential groove 39Yis -of a greater width than the groove 38 and its fforward wall l-flslopes graduallyto ltheedge of thegroove '38. The inner. end of the yieldablefplunger 36 is adapted to enter 'any one Yof these grooves.

When the mechanism is fidle and 'the parts are 5 in the positions shown the plunger will be seated in the rear groove 39 at one side .of "but close vIto the longitudinal groove 4:9 and'when it is desired to start the mechanism into operation the switch handle 23 is'moved forwardly to close the'switch and at the same time to slide the sleeve 32 forwardly on the member 9 and thus cause the yieldable plunger 36 to ride over the sloping wall of the rear groove and to enter the forward groove 38. When seated in the forward groove .the

plunger will hold the sleeve against rearward movement by the spring 35 until the y'bearing member 9 Yhas approximately completed one rotation with relation to the tool supportingmember I2 and the plunger 36 will then `be .brought into line with the longitudinal groove @40, thereby The Ytool sup- Y switch which controls the motor. In the present releasing the sleeve andpermitting the same'to/Y be moved rearwardly by the spring 35, fwhi'chmovement will .open the switch 36. 'Ihegopening 75= of the switch will not instantly stop the rotation of the two members 9 and l2 but there will be a slight overthrow sufficient to carry the plunger, which has then entered the rear groove 39, out of line with the longitudinal groove 40 so that when the switch is again closed the plunger will be moved over the inclined surface of the rearV groove and into the forward groove 38 and will lock the sleeve against rearward movement. If desired, suitable mechanism may be provided to limit the operation of the motor after the switch has been opened but such devices are well known in the motor art and it is not necessary to illustrate or describe the same.

In Figs. 3 to '7 I have illustrated a slightly modified form of the invention in which the mechanism operates in substantially the same manner as above described but in which the construction and operation of the tool supporting member differ somewhat from those above described. In this form of the mechanism a tubular member 44, herein referred to as a shaft, is rotatably mounted in-bearings 45 in a tubular supporting frame 46 and rotates about a xed axis. rlhe longitudinal bore 41 of the shaft is concentric with its axis instead of being eccentric thereto asin the form first described. This bore has portions forming bearings in which an inner member or shaft 48 is rotatably mounted so that it rotates about an axis coincident with the'axis of the outer or tubular shaft 44. The two members or shafts are, in the present instance, elongate in form and of substantially equal length. The two shafts may be rotated at different speeds by any suitable mechanism but I prefer to employ for'this purpose separate gear trains having differentV gear* ratios and, in the arrangement shown, a gear 49 is secured to the outer shaft 44 andl meshes with a gear 58 on the motor shaft 5I. A gear 52 is rigidly secured to the end of the inner shaft and meshes with a gear 53 on the motor shaft. The two pairs of gears may have any desired gear ratios, such for example as the ratios described in connection with the first form of the device.

The tool supporting member is separate from and is movable with relation to both the outer shaft and the inner shaft and, in the arrangement shown, it is carried by the outer shaft and is capable of transverse movement with relation thereto. In this construction the tool supporting member comprises a stud 54 having at its outer end means for securing a tool 55 thereto. The stud is provided at its inner end with an enlarged portion or base 56 which overlaps the end of the outer shaft 44, which is preferably enlarged as shown at 51, and has sliding movement on said shaft transverse-to the axis of the latter. The tool supporting member may be secured to the shaft in any suitable manner, as by means of a cap 58 screw threaded onto the enlarged end of the shaftl 44 and overlapping the base of the tool supporting member. Preferably a spring 59 is confined between the forward face of the base and the flange of the cap to hold the base in firm engagement with the end of the shaft without interfering with its transverse movement with relation thereto. The base is provided on diametrically opposite sides of its center with radial slots or guideways 60 into which extend studs 6I rigidly secured to the forward end of the shaft 44. The stud and slot connection causes the tool supporting member to rotate with the outer shaft 44, about the axis thereof, but permits the same to move transversely to said shaft.

The base 56 of the tool supporting member-is also provided with a slot 62 which preferably extends at right angles to the guideways (il) and this slotk 62 receives the forward end of a stud 63 rigidly secured to the forward end of the inner shaft 48 and spaced from the axis thereof. Preferably the stud is provided with a roller 64 which extends into the slot-62 and engages the parallel walls thereof. As the two shafts rotate simultaneously the tool supporting member will be caused to rotate about the common axis of those shafts and as the outer shaft 44 rotates with relation to the inner shaft the position of the tool supporting member with relation to the eccentric stud 53 will gradually change and the stud and slot 62 will cause the tool supporting member to move transversely to its axis, thereby movingrthe tool 55 across the face of the work. In this form of the apparatus the tool supporting member moves in a straight diametrical line across the axis of the outer shaft while in the form first described the axis of the tool supporting member moves transversely to the axis of the outer shaft in a circular path so that the two axes are at all times spaced a uniform distance one from the other, but in each instance the rotation-of the outer shaft through an arc of 180 with relation to the inner shaft will move the tool through its full movement transverse to the axis 'of the outer shaft and the continued rotation of the outer shaft with relation to the inner shaft will return the tool to its initial or normal position with relation to that axis. It will be obvious that either the inner shaft or the outer shaft may be rotated at the higher speed but inasmuch as the outer shaft is in the present instance the driving shaft I prefer to rotate the outer shaft at the higher speed.

The eccentric stud 63 is preferably adjustable radially to vary the amount of movement imparted thereby to the` tool supporting member and, in the present construction, the stud 63 is mounted in a block 65 which is slidably mounted in a transverse bore 66 in the inner shaft 48 and which may be secured in its adjusted position in said bore in any suitable manner, as by the screw threaded stud 63. The forward wall of the bore 66 is slotted, as shown `at 68, toY permit the adjustment of the stud therein.

This form of theapparatus is also provided with means controlled by the relative rotation of the two shafts for interrupting the rotation thereof, this means being substantially identical with that above described and comprising a tiltable motor switch 69 which is connected by a lever 10 with a member 1| slidably mounted on the shaft 44 for movement Vlengthwise thereof by a spring 12. The slidable member 1I'and the inner shaft having cooperating parts to control the movement of the member 1I with relation to the shaft 44.

While I have shown and described one embodiment of my invention, and one modification thereof, I wish it to be understood that I d`o not -desire to be limited to the details thereof as various modifications may occur vto a person skilled in the art.

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a tool operating mechanism, a tool, means including driving mechanism for rotating said tool Aabout a iixed axis, means .separately operated by said driving mechanism for gradually and continuously .changing the radius of ksaid tool toV cause the same to move over the work Ytransversely to the axis of. rotation of Ythe tool,-V

and means controlledl in accordance'with the transverse movement of :said toolf to interrupt the rotation ofthe latter whenit has completed' i; rotation therewith 'and for movement with relationV thereto, `said device and thel other of said members having cooperating parts controlled by the lrelative rotation of V.said members to control the movement of'said device with` relation to the member with whichit Yis connected, andmeans controlled by the movement of said device with relation to the member with which it is connected to interrupt the rotation ofsaid members.

- 3. Ina tool operating mechanism, two rotatable members mounted one withinV the other; means for connecting a tool with one of vsaid members for rotation thereby, means for simultaneously rotating said'm'embers at different'vspeeds, said members havingmeanscontrolled by the relative rotation of'said v'members to move said tool in a direction transverse to its axis, a device mounted on the outer` member for rotation therewith and for movement lengthwise thereof, means for imparting longitudinal movement to said device, the inner member having a circumferential groove and a longitudinal groove :communicating with said circumferential groove, said device having a part adapted to extendninto said circumferential Y groove to hold said device against longitudinal movement and to be brought intoline with said longitudinal groove by the relative rotation of Ycc saidmembers to release said device'for longitudinal' movement, and means actuated by the longitudinal movement of said device to interrupt the rotation of said members. Y Y

VV4. In a tool operating mechanism, two rotatable membersV mounted onewithin the other, means for connecting aY tool with one of said members for rotation thereby, and means'for simultanexously rotatingvsaidmembcrs at different speeds, Y

said members having means controlled by the Vrelative rctationof said members to move saidV tool in a direction transverse to its axis, a device mounted on the outer memberfor rotation therewith(v and forfmovernent lengthwise thereof, means for imparting longitudinalmovement to said device, theiginner'member-having twocircumferential grooves and a longitudinal'groove connecting said circumferential grooves, ayield-l ableplungercairied by said device and adaptedV to extend into one of said circumferential grooves 'while said members rotate and toV be moved through. said longitudinal vgroove intol the other.'-

circumferential groove'when one of. saidmembers has completed a predetermined movement Ywith relation to the other member, means controlled by the longitudinal movement of said de` vice to interrupt the rotation of said members, the; last mentioned circumferential groove hav- .ingan inclined surfaceleading tothe rst men- Y A' tioned Acircumferential groove, and vmeans for moving said plunger over said inclined surfaceV and into said first mentioned groove.

5. In a tool operating mechanism, a support, a member mounted for rotation about a fixed axis Von said support and having a bearing eccentricy to saidaxis, a tool supporting member mounted in said eccentric bearing, means-for simultane-4 ously rotating said members at'slightly different speeds to cause said tool supporting member to be moved transversely with relation to the axis of said bearing member, and means for autoe matically interrupting the rotation of said members when the member 'having the higher speed has completed apredetermined movement with relaticn'to the other member.

6. In a tool operating mechanism, a

tubular shaft, a second shaft rotatablymounted in saidV tubular shaft, a tool supporting member mounted on one lend of said tubular shaft for rotation therewith and for transverse movement withrelae tion theretdsaid tool supporting member havingV an opening therein, a stud carried by said second shaft, spaced fro-m the axis thereof and Vextending into said opening, means for radially adjusting said stud with relation vto said second shaft, and means for simultaneously rotating saidv shafts at different speeds. Y.

7. In a tool operating mechanism, a tubular shaft, a second shaft. rotatably mounted in saidtubular shaft, means for simultaneously rotating said shafts at Ydifferent speeds, a tool supportzal ing member mounted on oneend of said tubular shaft for movement transverse theretoand having radial guideways and a slot transverse to said guideways, studs carried by said tubular shaft and extending into the respective guideways, and an eccentric stud carriedby saidsecond shaft and Yextending into saidtransverse slot. Y

8. In a tool operating mechanism, a tubular shaft, a second shaft rotatablyY mounted in said tubular shaft, means for simultaneously rotating said shafts at different speeds, a toolsupporting member having a base, means for lsupporting said base in sliding engagement with one end of said tubular shaft, said base having radial guide ways on opposite sides ofits axis and havinga slot transverse Yto said guideways, studs project'- ing from said'tubular shaft into the guideways in said base, a stud mounted on said second shaft,

spaced from the axis thereof and extending into f the slot in the base, and a spring to hold said base in engagement withv the end` of said tubular shaft.

9. In a tool operating mechanism, a supporting structure, two members rotatably mounted on said structure, driving mechanism separately connected with the respective members to simultaneou'sly and continuously rotate the same atV different speeds, a` tool supporting member mounted on one of the first mentioned members forrotation therewith and for movement transversely thereto, the other of said first mentioned members having an eccentric part to; engagesaid tool supporting'member andimpart transverse mover ment thereto.

10. In a tool operating mechanism, afsupporting Y structure, a tubular shaft rotatably mounted on' said structure, a second shaft rotatablyA mounted 4 in said tubular shaft, a tool supporting member` mounted on one end of said tubular shaft for rotation therewith and for transverse movementY (with relation thereto, said tool' supporting mem-A ber having an opening therein, a studcarried byV said second shaft, spaced from the axis thereof and extending into said opening, and driving mechanism separately connected with said shafts for simultaneously and continuously rotating the same at different speeds.

11. In a tool operating mechanism, a rotatable outer member having an internal bearing, an inner member mounted in said bearing, means for continuously rotating said members at different speeds, and means for connecting a tool with one of said members for rotation therewith and for movement in a direction transverse to the axis of the other member, said other member having a part eccentric to the axis thereof and arranged to act on said tool to impart transverse reciprocatory movement to said tool while it rotates in one direction.

GEORGE H. LELAND.

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