US2488866A

US2488866A - Grinder machine accessory

Info

Publication number: US2488866A
Application number: US645180A
Authority: US
Inventors: Illmer Louis
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-02-02
Filing date: 1946-02-02
Publication date: 1949-11-22
Anticipated expiration: 1966-11-22

Description

L. ILLMER Nov, 22, 1949 GRINDER. MACHINE ACCESSORY 3 Sheets-Sheet 1 Filed Feb; 2, 1945 II-NVENTORI iiW-AAW L. ILLMER- Nov. 22, 1949 GRINDER MACHINE ACCESSORY 3 Sheets-Sheet 2 Filed Feb. 2, 1946 Zhwentori Nov. 22, 1949 L. lLLMER I 2,488,866

GRINDER MACHINE ACCESSORY Filed Feb. 2, 1946 3 Sheets-Sheet 3 Patented Nov. 22, 1949 UNITED STATES PATENT OFFICE 2,488,866 GRINDER MACHINE ACCESSORY 7 Louis Illmer, Cortland, N. Y.

Application February 2, 1946, Serial No. 645,180

11 Claims. 1

My invention relates to novel improvements in surface grinding machinery, and is more particularly concerned with abrading a long batch length of reelable alloy steel or the like elongated stock by the use of abrasive tape. Said machine is adapted to drag its work piece from 'a suitable stock storage agency in a directed travel path that extends through my grinder unit to rapidly and economically pregrind such work piece lengthwise in successive passes, the strip travel rate of itself furnishing the necessary Velocity for intensive cutting action upon having relative coarse grit applied thereto.

The present grinder unit is devised to utilize slowly fed paper-backed grit in roll tape form, the performance being such as to expend its grit life in a single pass through a localized cutting zone. Because of a progressive grit loading, the

emerging ground metal strip may in one treatment be given a lustrous or virtually burnished finish.

A tape supply spool and a corresponding driven offtake reel may feed multiple comparatively narrow tapes through their respective cutting zones when such tapes are distributed edgewise across the entire strip width. Simple motorized means are provided for slowly driving such offtake reel and for facilitating a speedy replenishment of tape renewal.

The object of my invention is to devise a refined grinder unit of the indicated character adapted to abrasively treat a long batch length of reelable stock on a rapid 10W cost production basis. Embodied herein are diverse tape control improvements that promote the end in view.

Reference is had to the accompanying three sheets of drawings which depict an illustrative embodiment, and in which: 7

Fig. 1 shows a top plan view of my grinder unit;

and Fig. 2 diagrammatically represents an elevational side view of such assembly taken obliquely along the section 22 of Fig. 1.

Fig. 3 represents a sectional view of my improved tape supply spool equipped with an inbuilt braking device as taken along 3-3 of Fig. 1;

and Fig. 4 is a cross-sectional view taken along 4-4 of Fig. 3.

Fig. 4A details certain tape securement means.

Fig. 5 presents a sectional view of my takeoff reel. along line 5-5 of Fig. 1.

Fig. 6 is fragmentally taken along 6-45 of Fig. 5 to show a pin gear mechanism for intermittently advancing the tape supply; and Fig. 7 is an elevational side View of such assembly.

. piece.

2 as at I i and the rotor may be perimetrically lagged at MBA with a rubber sheath (see Fig. 2).

The motorized rotor axle ll may be coupled at IE to a suitable prime mover whereby to drag the work piece I! in a directed travel path. The rotor may be driven in the arrowed direction to impart a desired linear velocity to said work Such work piece may comprise a single endless loop of stock or multiple strips of finite length laid alongside each other to fall within the confines of the overall tape width marked W (see Fig. 1).

A guide pulley I8 may divertingly direct the surplus strip stock coming from a suitable magazine or storage agency onto the rotor perimeter as shown in Fig. 2. The out-turned face of the treated strip I! may be simultaneously preground by a plurality of abrasive paper-backed roll tapes, respectively mounted upon the twin supply spools or drums 2t and 2|. The overall tape width of each such tape supply quota is preferably split up into aliquot components W that are kept closely spaced edgewise. The non-overlapping tape groups of finite length such as 201 and MT may respectively be slowly fed into their cutting zones in an obliquely inclined direction to the rotor axis (see Fig. 1). For a relatively large rotor diameter, the cutting zone length as measured perimetrically, may be kept comparatively long and thus maintain a biased ridge-free cutting lap between each inclined next adjacent tape interspace.

The housing girders I2 and l3 may further be spanned by the parallel trunnion shafts 22 and 23. Afiixed to the respective end regions of each such shaft, are the guide levers 2A and 25 of which corresponding free extremities may be bridged by a header beam such as 26 or 21. These beams are rendered selectively shiftable toward or away from the rotor axis. For this purpose, corresponding ends of each trunnion shaft may be equipped with a Worm gear 28 and. a worm 29 that are adjustable in unison through a worm connection shaft 30.

Referring more specifically to these disclosures,

my grinder unit preferably comprises a rotor drum ii! affixed upon the axle I l that spans the opposed housing girders l2 and I3 in the Fig. 1 manner. The rotor rim ends are purposely flanged Each header beam may pivotally carry one or more spring backed shoes l9 placed in tandem and respectively having a length equal to the tape width W. A spring encasing tubular slide 3i may fioatingl-y back the associated shoe thereof. Such-backing thrust as applied to a suspended medial tape region, is preferably kept under moderate intensity per square inch of grit contact area and collectively arranged to extend uniformly across the entire strip width W, irrespective of the accompanying beam deflection.

The tape offtake reels 32 and 33 may respectively be provided with parallel spindles 34 and 35 that are given an acutely oblique inclination with respect to the rotor axis. As detailed in Fig. 5,

0 each such hollow cylindrical reel may be flanged and have its spindle mounted in frame supported bearings. One spindle end is shown provided with a coupling 36 of which the adioined members may be interlocked by the demountable key 37.

The spindles 38 and 39 of the respective tape supply spools 2i] and 2| are preferably disposed in a trailing parallel relation to their respective reel spindles in the Fig. 2 fashion. The cylindrical rim diameter of such set of drums may be kept equal and sufficient in size that a standard 50 yard roll of abrasive tape when mutually coiled thereon in suspended relationshipas shown,.may be transferred without building up excessive convolutions on either drum. Such disposition permits of maintaining a virtually uniform tape feed rate for a constant takeoff reel speed.

As guided by certain rollers, the path and feed direction of each suspended tape 2ST and ZIT are indicated by dotted outline in Fig. 2, the dragged tape being purposely headed downwardly toward the yoked spindle supporting crotch 59'. The coiled tape grit is preferably exposed exteriorly on the respective drums 32 and 33 where it may readily be inspected forproper performance. It will be observed that Virgin tape preferably enters its cutting zone beneath a backing shoe in the direction of rotor rotation. Since 'my slowly fed tape is intended to become substantially spent prior to leaving its cutting zone, even coarse grit loads sufficiently to impart a virtually burnished finish to the work piece after being treated in successive passes. The described dual header beams serve to double the rate of 'stock removal, it being evident that a single header unit might likewise be used.

When the abrasive is fed as indicated, theresulting cutting plus frictional drag tends to'strip the supply spool of tape. To counteract such stripping, it is preferred to compactly inbuild a relatively powerful slip clutchunit into each supply spool (see Fig. 3). One or both'ends of my sleevelike tape supply drums suchas -20 may be eounterbored for the reception 'of the reversely disposed companion slip rings 42 and 43, these being recessed to center therebetween multiple helical compression springs such as 44.

Said rings respectively thrust against the clutch plates 45 and 46 provided with interspaced hubs mounted upon a common spindle 38. Plural plate clamping bolts 4'! are disposed radially inward of the clutch rings to retain the springs under compression. The use of shims (not shown) allows the frictional clutch to be adjusted to suitdrag requirements. The hubs of the plates 45 and 46 are preferably keyed at 48 to the speed controlled spindle 38 while the plate perimeter slides freely in the drum counterbore. On the other. hand, the perimeter of the rings 42 .and :33 may each be keyed at 49 to the supply drum 20 to effect a frictional drag between each plate and its slip .ring when the spool sleeve is rotated with respect to the restrained'spindle.

Each frame supported bracket such as 59 may be forked or given a like yoke 'shape'atiits upstanding end 59' to demountably journal the spindle 38 therebetween for unitary removal of my brake equipped tape spool. One spindle end may be provided with separable spur gears i and 52 arranged to be intermittently driven by a so called ratiomotor'unit comprising the worm reduction gear 53 and a worm filldirectly connected to the armature shaft of a small .motor M-l. When this motor is inoperative, the worm 54 automatically stalls the spindle 38 but permits the spool 29 to rotate thereon while subjected to clutch braking drag. The tape counterdrag imposed by the adjusted clutch springs is intended to exceed the cutting drag exerted on the shoe loaded tape by the revolving rotor l0 and hence requires a substantial differential drag effort on part of the companion oiftake reel to effect tape transfer. The perimeter of the spool 20 and that of the reel 32 may each be longitudinally kerfed as at 5G to respectively engage a hookshaped strap 51 attached to each tape end in the manner detailed in Fig. 4A.

Referring now to Figure 5, this discloses the preferred mode for slowly driving my offtake reel 32. Mounted upon an overhanging bracket 58, is a socalled large-range gyro speed reducer comprising the tubular casing 59. Through the casing axis there extends a .high speed input shaft 60 provided with an eccentric length 6| upon which is mounted a dual gyro gear 62 of the spur gear type. A stationary internal gear 63 meshes with one such spur gear and the other spur gear may mesh with the movable internal gear 64 keyed to respectively provided with more teeth than their mated dualgears 62 whereby the eccentric movement imparted to the latter-causes a slow advance of the output shaft 65.

The inherent disadvantage of an equivalent double reduction worm gear unit affording a commensurate speed reduction, lies in its defective worm behavior due to inadequate lubrication when running at the extremely slow output duty herein required. The more compact spur gearing of the cited gyro unit does not suffer from a like limitation.

In order to adapt said gyro drive to present needs including the provision for tape feed regulation, it is preferred to snugly superimpose a controlled reducer mechanism uponthe casing 59 in the Fig. 5 manner. To this end, I may resort to a motorized twin tooth pinion-as embodied in the oppositely disposed cam lobes 61 and 68. The similar non-circular profiles thereof are respectively shaped to smoothly pickup and periodically .advance in actuated ratchet fashion, a pin roller shaft 60.

As detailed in Figs. 6 and 7, said drive mechanism may be installed in a demountable frame 69 provided with a pinion shaft 10 and a supplementary gear shaft II that respectively lie in parallelism with the input shaft 60. Said pinion shaft is coupled at 12 to the speed reducer 13 of the ratiomotor type comprising the worm gear 14 that is driven by the constant speed fractional H. P. motor M--2.

The gear shaft H mounts three laterally spaced pin-connected discs 16A, 16B and 16C. For a speed reduction of 6:1 as shown, each next adjacent pair of discs may be bridged by six pin rollers such as IT or 18 which are relatively staggered about the shaft H to constitute a pin gear. The camlike lobes 61 and 68 respectively align with one 'set of such rollers and mesh therebetween.

In the Fig. 6 layout, one rotating lobe 68 has been brought into engagement with its roller 18 while the other trailing lobe 61 is about to engage a contiguous roller 11 to apply torque that progressively rotates the gear shaft ll stepwise in non-interferingly enter successive pin rollers thereof and thus permit a rapid frequency rate Save forzlcbe clearancesthezwormrgearreducenzfliii stallss the: gears shaftii H: against. inadvertent reversali:

As regards-thesintendedl modewofi: tape: eeplenishment; each :restockedosupply spool "2 i 1:.

2 i may. initiallyrhavevwound thereon asfuli: quota of fresh? tapeof whichzthebottom tapeaend mayzhel cleated in place as in Fig. 4A.l. By bo'dilyfliftingr anrzexhausted: tape supplygspoolwtogether with its clutches: out of/thespaced sbracket \yokes :50; ans: other suDp1yrspool=.-with=yirgimtape :mambe: sub' stitutedvin its -.place.-.- Theouter tape endz-thereoi ma n-by;splicingbetrailingly; dragged rthroughzza Fig; 2 tapepath and hooked intcithe kerfnfifipfiits previously-emptied ofitake-reel. Aftersuchziresh tape: -supply '=has in .turn::.become exhausted: the coupling-ikeyys'l maypbeavithdrawn to'permit obstructed-rotation: ofaanx-associated-offtake reel-2 Bypthenl startinggthe motonM-el theispent' tape will: back-:tracksontowim original supply:3sp ool:"for tape removals-purposes: Such: motorizedback tracking"; of: as long tapealengt'h; 1 .speeds v upsthe daily productivecapacity of: :my;-strip grinder-(by miniinizing-gthez servicing :timew otherwise needed on: part of 'skilledelabor when; manuallytranse fer-ring such'tape: V

The :foregoing rather-rexplicit disclosure will; it is vbelieved makerevidenttothose skilled-in: this art,-.-thermore outstanding commercialwand"opera at-ive advantages afiordednbyimyitape feedree finements, it being understood that Lreservei-the right to correspondingly ;-modify my single illustrative embodiment; all Without departing from the-rspirit and scope of myrinventioni heretofore described and. more particularly defined 2 insthe appendedclaimss.

1. A ngrinder .machine-:adapted-:.to treat-aelone gated stock asrai WOFKJIJlLEC :andazwhich machine comprises driverr sdraggrxmeansr-v-to :move the rwork piece longitudinally; in .a :direetedotravel:path,- an abrasive tape of finiteolength operatizvely: applied to said \vorkz'pi'eceziniaclocalized cutting:.-.zone, a

taper supply spool sands a -:matedtakeoff?v reeli oi Whiehthe respective axes arefparal lelly disposed Withn a"; medial tape tpontinn: transf'erablyr sus-e pended therebetweenza spindle mounting: the

supply; spool 1 thereon; braking; means for f the supply spool including a clutch plate member-and a spring:loaded frictional slip ring member that spacedly encircles the spool spindle and one of which members is fixed to the supply spool and the other member isfixed: to saidespindler a clamping bolt entered througlr suchspacing and serving to retain .the ring in loadedengagement with saidplate; and' drivemeans'for rotating.

the takeofi reel.

21 A igrindermachine adaptedzito treati'elom.

ferablyrsuspended:therebetween, andnfrictionall braking means for the supply spool includingaa clutch iplate afiixedmtoothezspooli spindle: and slip fittediswitlirrespect (to csaidwlimand. further tin-r eluding 7 a2 cooperating; slip;i:ring,.; affixed to; the

spcol'z riml'in arrrzencirelingigrelationz 139 3584164 spin-r dleg: means-lion axially, impressing; said; ring into flatwisedrictional enga ementwith its plate; and: means for:controllably. retaining; the spindle against rotationrzl 3.:.A grinderrmachine:;adapted to: treat 61011-2: gated stockias;;a.'wook pieceziand whiclr:machine comprises driven .dragnneans servinggtomovexthe: Work piece: longitudinally: through: a';' directed traizel: path; .amiabrasive tape of finite length; said: tape zbeing:zoperatively'appliedfito the work pieceoimaslocalned; cuttingzone, .a tape supply spool and a mated-:ofitakeereehof 'whichrtherree speetiveiaxes-r-are :disposedrini substantial paralz-l lelisnmwitii aemedial :tape portioni;trarisferablyv suspended; therebetweemi. spindle rotatably mounting said spool'lthereongzbraking for. thessupplytspoolreompnising 'pairxoi zfrietionally conpledncluteha'membersso .w .ich.:oneyisl;afiizied v to rctatefin unison with therspool'zspind-le and the other?memberxisafnxedrtea rotate insunison .with the=.supply:spool,aa dtmotorizedrzdrive means; for saido spool;spindieizincludingx a locking agency thatzantomnti'callyastallslftherspindle againstztros tation;whernsaiddinive'meansis renderedvinactive';

lia-Ac grinder :machine adoptedo to treat 61011? gatedostock raseazworkpieeesand;:whichz'zmachine compriseso means for dragging; the-:1 WOl'kJ. piece longitudinally throughasdirectedetravel path; an ahrasiveatape iof finiter length; said'tap'e being operative'ly'appliedatosthe work pieceriinallocale izedo cutting: zone? a, tapee supply" spool and :1 a matedfiofital: reel-Jowhich the respective :axes are: panallellyrdispcsed: with: a: medialnatape' pore; tione transferably: suspended". therelcetween; a spindle rotatablyi mounting: said: I spool thereon; braking zmaa-nsa-ior the. snpp'ly spool comprising-Ya pair: of frictionally coupled: clutch 1 members of whichmne is aifiizediitoi the spool spindle and; :the other member is ai flied to rotate with'uthesupply spool, motorized drive means :for said: spool: spindlie' i'ncluding r a lockingagency e that i stalls the spindle against-rotation when: said drive means is .1 rendered inactive; another: drive=- means a for rotating the:=offtal'ereel;f a: disengageable cou plir'ig fon tl'i'elast named' drive means; said oou= pling when disengaged"? allowingpreviously transferred tape=to=. back tracl onto the supply spoolfi 5-? AA grinder machineiadopted to treat elon gated stock as a wor-k' piece and which machine is equipped w-itl' "-.driven drag means serving-to move the work piece longitudinallyg an abrasive tape =of finite-"length :01 which a medialportion is'e operativelyapplied toz the Work piece in a ldc-a'l-i'zed utti r'xg zeneea pair oi rotatable drums dispcsed in' substant parallelism respec= tfvely-having'said ta "VVQLl-llld about such: drums spanning transferable relationship-,- and a tubii'larr casing mounting therein stationary internat' gear-r a gear driven: slow speed output shaft and a motorized axially aligned input shaft provided with ans'eccentric upon-Which is mounted interloelz'ed"dualspurgears' 'cfiwh'ich one such meshes=witlfithe output shaft gear' and the=other substantially spent in one pass through said cutting zone.

6. A grinder machine adapted to treat elongated stock as a work piece and which machine is equipped with driven drag means serving to move the work piece longitudinally, an abrasive tape of finite length of which a medial portion is operatively applied to such work piece in a localized cutting zone, a pair of rotatable drums disposed in substantial parallelism and respectively having said tape wound about such drums in spanning transferable relationship, a speed reducer mounting a high speed input shaft and a slow speed output shaft, the latter being coupled to one of said drums, a reducer drive mechanism including a pinion shaft provided with opposed camlike lobes and furtherjncluding a supplementary gear shaft carrying a pin gear thereon that cooperatively meshes with said lobes, said gear shaft being arranged to drive the aforesaid high speed shaft, and motorized means for rotating said pinion shaft.

'7. A grinder machine adapted to treat elongated stock as a work piece and which machine is equipped with driven drag means serving to move the work piece longitudinally, an abrasive tape of finite length operatively applied to such work piece in a localized cutting zone, a rotatable tape supply drum and a mated offtake drum having a medial tape portion transferably suspended therebetween, a speed reducer mounting a high speed input shaft and a slow speed output shaft, the latter being coupled to one of said drums, a reducer drive mechanism, comprising a rotatable pinion shaft and a supplementary shaft mounting a pin gear thereon, the pinion shaft having two axially interspaced camlike lobes set in radial opposition and the pin gear comprising multiple laterally spaced discs of which one pair of next adjacent discs are pin interconnected in staggered relation to the pins of another pair of such discs to successively mesh with the respective lobes, and motorized means for rotating the pinion shaft and which supplementary shaft is arranged to drive the aforesaid input shaft.

8. A grinder machine adapted to treat elongated stock as a work piece and which machine is equipped with driven drag means serving to move the work piece longitudinally, an abrasive tape of finite length operatively applied to such work piece in a localized cutting zone, a pair of rotatable drums disposed in substantial parallelism and respectively having said tape wound about such drums in spanning transferable relationship, a tubular speed reducer casing mounting therein an outwardly projecting input shaft and an axially aligned slow speed output shaft coupled to one of the drums, a reducer drive mechanism superimposed upon said casing and including a motorized pinion shaft provided with camlike lobes and further including a supplemental gear shaft disposed in parallelism with the casing axis to carry a pin gear thereon that cooperatively meshes with said lobes, and change gear means operatively interconnecting corresponding ends of the supplemental gear shaft and said input shaft.

9. A grinder machine adapted to treat elongated stock as a work piece and comprising drag means adapted to move the work piece longitudinally in a directed travel path, an abrasive tape of finite length operatively applied to the work piece in a localized cutting zone, a rotatable tubular tape supply spool of which the ends are respectively provided with an axially projecting journal, braking means inbuilt into said spool to comprise a pair of laterally spaced clutch plate members that are each interiorly engaged by a separate slip ring member having compression springs interposed between said rings and means rotating one pair of like members in unison with a journal and for rotating the other pair of like members'in unison with the supply spool, said braking means being bodily dem'ountable as a unit with the spool.

10. A grinder machine adapted to treat strip stock as a work piece and which machine is equipped with a motorized rotor having a work piece portion belted to the rotor rim and serving to longitudinally move the work piece in the rim travel direction, an abrasive tape of finite length operatively applied to the outer side of the work piece to constitute a localized cutting zone thereon, a tape backing shoe superimposed upon such zone and impressing tape grit inwardly toward the rotor axis to subject the tape to a cutting drag, a rotative tape supply spool and an associated tape offtake reel having an interposed tape portion transferably suspended therebetween in an acutely oblique inclination with respect to the aforesaid travel direction, brake means for the supply spool imparting a counterdrag thereon when rotated, and drive means slowly rotating the offtake reel to advance the suspended tape portion through said zone against the counter-drag imposed upon the supply spool whereby to obviate stripping tape off of such spool by the cutting drag.

11. A grinder machine equipped with driven rotor means adapted to drag an elongated work piece longitudinally in a certain travel direction, an abrasive tape operatively applied to the work piece to constitute a cutting zone which tends to draw along such tape in the aforesaid travel direction, a tape supply spool and a mated ofitake reel disposed in substantial parallelism with a portion of such tape transferably extending between said spool and reel, slip clutch means operatively associated with the spool and imposing a dominating brake counter torque thereon superior in magnitude to the drag tendency of the tape cutting zone, and dual cam lobes together with a cooperating pin gear serving to intermittently actuate the reel in close succession and feed said tape ofi the spool onto the reel.

LOUIS ILLMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 807,001 Spiro Dec. 12, 1905 1,993,559 Marchev et al Mar. 5, 1935 2,105,612 Pallas Jan. 18, 1938 2,244,536 Herchenrider June 3, 1941 2,320,142 Illmer et a1. May 25, 1943 2,385,445 Illmer Sept. 25, 1945