US2320142A - Grinder machine for strip stock or the like - Google Patents

Description

May 25, 1943. ILLMER EI'AL GRINDER MACHINE FOR STRIP STOCK OR THE LIKE Filed July 14, 1941 3 Sheets-Sheet l m M mm m A 1 m m -I. a .I- o m V km 7 2 i 3 1 Su Em w a G 0 O n UN: "EPA/WW1 n o .lmvld km mm mm o v m m"mmm m mH $3 3 UUUUHIU 2 U U U U H U HHHHHHnnHnun ON TV (Ittorneg May 25, 1943. 1.. ILLMER ETAL 2,320,142

GRINDER MACHINE FOR STRIP STOCK OR THE LIKE Filed July 14, 1941 3 Sheets-Sheet 2 F IIIIIIIIIIIIIIII 57/ I! VIIIA'IIIIIA 711174 f 3nvcutor5. Lou/slLLMEA VERNoNRPHLLHs Gttorncu y 1943- IL. ILLMER ETAL 2,320,142

GRINDER MACHINE FOR STRIP STOCK on THE LIKE Filed July 14, 1941 s Sheets-Sheet 3 31wcntor3; Lou/s L LME'? VERNON R. PHLLHS D 3 attorney Patented May 25, 1943 UNITED STATES PATENT OFFICE GRINDER MACHINE FOR STRIP STOCK OR THE LIKE Louis Illmer and Vernon R. Pallas, Cortland,

N. Y.; said Pallas assignor to Leota T. Pallas Application July 14, 1941, Serial No. 402,352

15 Claims. (C1. 51-150) This invention relates to a commercially practicable surface finishing apparatus in which abrasive tape is effectively utilized, and more especially pertains to an improved non-rotating head type of machine adapted to rapidly apply a lustrous metallic pohsh to fast moving round or fiat strip stock, butt welded rods or other reelable products when dragged longitudinally through our compact machine in one or more passes. The present compartment type of machine is particularly designed to efficiently grind and highly polish hardened piano, stainless steel wires or the like high tensile strip stock without requiring any fast moving parts except for the treated wire itself'and its drag mechanism.

The instant specification represents certain improvements over our copending application Serial No. 366,596 as filed November 22, 1940 and similarly resorts to a series of laterally spaced bulkheads or stationary frame plates, re-

spectively having mounted thereon angularly staggered abrasive tapes arranged to treat crosssectionally flat or round work pieces. fered product velocity of several thousand feet per minute affords a fast productive rate for a given collective width of active tapes and results in proportionately low machine and prod-- uct costs.

The present machine further comprises a plurality oi independently demountable disc units, each equipped with a full complement of tape feed roller devices. Each such self-com tained, stationary disc is herein provided with novel flexible drive shafting for actuating the tape feed roller means, the discs being mounted.

into a horizontal split housing having circular guideways in which the disc units may. respectively be upheld and manually rotated for servicing. A radial slot provided in each disc per- A pre-' mits of independent disc removal without having [erred exemplifications, and in which drawings: V

Fig. 1 represents an elevational side view of a single split housing assembly and associated reel parts embodying our invention, and Fig. 2 a top view thereof.

Fig. 3 is a cross-sectional housing View taken along 3-3 of Fig. 1.

Fig. 4 details a gear bracket for driving a flexible shaft as taken along 4- 4 of Fig. 3, while Fig. 5 is an end view thereof.

Fig. 6 shows an edge view of a demountable disc bodily removed from the housing and having its mated control accessories attached to the respective side faces.

Figs. 7 and 8 respectively depict opposed face views of the assembled discs.

Fig. 9 is a fragmental cross-sectional view taken along 99 of Fig. 7, and Fig. 10 rcpresents a similar 'view taken along Ill-ii! of Fig. 8. Fig. 11 represents a fragmental view of the tape'clamping jaws along Il--ll of Fig. 8, and

Fig. 12 shows a transverse section of said jaws.

Fig. 13 is an elevational assembly of our wire grip mechanism as seen along l3--I3 of Fig. 1. and Fig. 14 is a top' View thereof.

Figs. 15 and 16 detail one of the roller units comprised in such mechanism,

Fig. 17 illustrates a housing disc provided with a modified tape roller arrangement, and Fig. 18 reveals the jaw details associated therewith.

Referring more specifically to these disclosures, our split housing may be fabricated in v sheet metal to comprise a pair of laterally spaced foundation rails such as l i] having a base ll mounted thereacross (see Fig. 3). The upright longitudinal side walls of said base may respectively be inturned to provide for skirt ledges l2 and I2 which may constitute the parting plane of said housing; Bridging these ledges are aseries of depending twin flanges such asl3 and I3 (see Fig. 6) that may be given a semicircular angle iron shape and the outer perim eter of which angles may be welded to the trough shell M. An ejection pipe l5 may vent said trough and carry off abraded waste products.

A superimposed semi-cylindrical cover sheet' I 6 may be cross braced by the struts l1 and bolted in place to span said ledges as shown. This crowned cover may be equipped with a series of twin angle iron ribs that successively register with the corresponding base elements to provide for aplurality of endless disc receiving grooves or guideways I8A, IBB, etc. For convenience of drives a transverse stub spindle '29 which may be socketed for the reception of the laterally flexible shafting including a stationary armor having a driven core rotatably mounted therein.- 'A motorized variable speed transmission 'unit32 having a finger tip control 33, may chain drive one end of the line shaft 25 to impart a very slow but controlled rotation to said line shaft and its severalgear-connected-fiexible shaftings 30.

Such coupled spindle and shafting constitute disconnective transmission means arranged to facilitate the independent removal of any one housing partition.

Entered into each of the guideways IBA; [8B, etc. is a stationary partition disc 34 of sheet metal, the respective discs being centrally'apertured at 35 and having a radial slot 36 extending to the disc perimeter. An elongated work piece 31 preferably of reelable round or-fiat metallic ribbonstock, may be threaded'endwise through'the respective disc-apertures. Each discmay be pivotally carried upon a pair of trunnion rollers such as 3| which facilitate upturning their respective slots into registry.

As schematically indicated in 'Figs.'1 and 2, a

driven take-up reel 38 equipped with convention-'- al level winder means, may be located at the aft end of our housing, it being understood that the strip stock is to be 'alignedly fed'oif a brake loaded companion supply reel (not showm locatedat the fore-or opposite h'ousing'end;

If desired, the strip'stock'may be straightened, and woundon a demountable' supply reel in sufficiently long lengths to keep our machine in operation for a protracted time' period; To this end, adjacent terminals of a series of component wire or rod lengths may be 'buttwelde'd' and wrapped in ilayerson an appropriate supplyreeli A suitable lead wire'maybe included for initially wrapping the respective drums. A pair of lateral guide rollers 39 serve to maintain the treated wire in proper axial alignment with the several disc apertures 35 while being'ree'led. When handling high" tensile straightened wires or rods up to about onefourth inch in diameter, it is expedient to resort to correspondingly large" reels that shall not im'-' pose a permanent set'to the wound wire.

Spe'cial'provision' has been made to rapidly drag said wirelongitudinally independently of the off-take reelpull and t'hus afford adequate cutting action for our slowly'fedpolishing tapes: A

primary motor 40 is clutch pulleyM provided with the control 'lever 4!. One endof the main pulley shaft may be chain driven to the take-up reel shaft 42 which in turn'is equipped with an adjustable slip clutch 43. The tensioned wire when longitudinally advanced through ,manytapeshavin'g a collective width substantially equal 'to the housing length; is sub shown belt driven to a mam jectedto drag of considerable magnitude likely to mar alustrous superficial finishwhen wire-is to be closely wound in deep layers and dragged solelyby a powendriven take-up reel.

By the use of driven supplementary belts such as 45 and 46 respectively cooperating with numerous opposed backing grip rollers 41 and 48 and havin the work piece interposed between, the take-up reel may be relieved-of its usual drag duty. The reel 38 is preferably geared to overtravel its drum perimeter by slip on part of the clutch 43 whereby to keep the wire taut without slackening as it leaves the last grip roller in the arrowed travel direction.

Referring in detail to Figs. 13 to 16, such grip mechanism may be inbuilt into a sheet metal framework 50 in which two pairs of axially spaced pulleys 5| and 52, also 5| and 52', may respectively be installed upon separate axles horizontally extending crosswise of the treated wire. The upper and lower aft axles 53 and 54 may be superimposed in-parallelism and have the motor driven main pulley 44 mounted on one such axle. A train of gears 55 interconnects these axles for simultaneous rotation in reversed directions. -A

set of upper and lower fore-counter axles may be similarly disposed but without gear connection,

since these may be independently driven by the lap spliced endless belts 45 and 45 in the Fig. 1 fashion.

Opposed belt tighteners may serve to keep tautthe next adjacent belt sections 45' and 46' that move in a like direction. As indicated in Fig. 15, these spaced superimposed belt faces may be of adequate width to transmit the required power to a heavily dragged wire. Snugly circumscribing each belt 45 and 46 is a dressable grip strap 57 and 58 between which a round-0r flat work piece may be frictionall clamped. Such endless strips are preferably made of high grade chrome leather with a shallow initial groove therealong and replaceably glued to the exterior of its pulley driven belt.

In order to releasably control the grip of the interposed wire, a series of upper and lower back ing rollers such as 47 and 48 may be fluid actuated by the use of the reversely pivoted yokes 6B and 6|. A bracket plate-62 may be removably clamped to an upright plate of the framework 50 to overhangingly carry said yokes thereon as shown. Each outer yoke end is provided with a high speed backing roller preferably of the ball bearing type since its radially loaded outer race perimeter must rotate at belt velocity which is kept identical with the rate of the desired wire travel of more than one thousand feet per minute. A metallic bellows or the like diaphragm means 63 may be interposed between the inner yoke ends. The thrust of the several retractible roller pairs may be controlled in unison by the interconnected fluid supply pipes such as 64 that lead to a branch 24.

A yoke spring 65 may automatically relieve theroller thrust after the fluid supply iscut off. In

' still dominate the anticipated tape drag through the Fig. 1 housing. The use of such closely spaced opposed rollers when cushioned by leather or the like agency, efiects a well distributed clamping grip on the wire.

In the case of tandem units, their respective grip mechanism serve to distribute the required drag of the treated wire through the several housings and deliver the same into the next housing substantially relieved of drag tension.

In such tandem arrangement, it is preferred to gearv interconnect all the grip pulleys to run in unison from a common motor by means of an equalizing drive.

Attention is now directed to Figs. 6 to 12 in which the first named. reveals the novel manner in wh-ich'our independent spool carrying units may be dropped intoany particular split housing groove such as I8A,. I8B, etc. Each such unit comprises a demountable circular disc 34 of sheet metal of which the perimeter may be provided with a keyway 68 that when properly located falls into registry with a retractible bolt 69 disposed near the housing parting plane (see Fig. 3). Upon removal of the disc embracing segmental cover .I6 and withdrawal of said bolt, the disc maybe freely rotated manually about its centralized wire receiving hole 35. The successivekeyed disc assemblies are intended to be angularly staggered and locked .to bring their respective tapes in proper relationship to uniformly abrade the entire superficial surface of the treated wire 31. After disengaging the flexible shafting 39 from its socketed stub spindle 29, and breaking the air supply connections, the narrow disc slot 36 allows of selectively demounting any one disc assembly while the wire 38 remains threaded through the other units. After bodily removal from its groove by the use of the disc pry holes 1! the associated tape spools of any one disc mat be conveniently reloaded or a stocked substitute p disc-may be inserted in lieu of a spent disc. Such independent hoisting not only facilitates servicing but permits adjacent discs to be closely spaced apart at the minimum of clearance. In lieu thereof, the several discs may also be additionally spaced laterally and manually rotated to bring their cleared spools uppermost without having to bodily demount any of such discs for tape replenishment.

The stationary discs may each carry reversely disposed tape. spools 12 and 13 respectively, as will'be seen from the assembled face views in Figs, '7 and 8f Theselayouts are substantially identical except for" being shifted angularly to partially counterbalance the tape clamping thrust I againstfthe treated work piece. The Fig. 9 disc side face has bracketed thereto an angle head casing 14 that preferably mounts a head worm I and a cooperating worm gear shaft 16, which latter is disposed in parallelism with the spool spindles. Axially aligned with said gear shaft, is a fixed solid stanchion 11 about which rotates the drag gear I8 provided with a pin that is driven from said worm shaft. The worm I5 is preferably actuated through an individual flexible shafting which in turn may be selectively rotated by the common transmission unit 32.

A fixed tubular stanchion 19 has an end riveted into one such disc face. R-otatably surrounding said stanchion is a driven feed roller 89 of which the disc end is provided with a gear that meshes with the drag gear 78. A stub shaft BI is rotatable interiorly of said stanchion and may be carried along with the feed roller by the drag pin 82. The overhanging inner end of said stub shaft extending through the disc, may be provided with an intermediate gear 83 that meshes with the roller gear 84 to drive its flanged feed roller 85 located upon the opposite d-isc face. The aim is to utilize a single angle head for each disc assembly and to simplify the required severable connections associated therewith. The arrowed directions indicate the respective gear rotations. In addition, each face layout may be provided with a pair of flanged idler rollers such as 81 and 8B (or 81' and 88') which guide their respective single tapes 86 or 86' into operative position about the treated wire. As shown in Fig. 10, one'such idler roller namely 88 or 88, may have one end thereof equipped with an adjustable spring clip 89 which imposes a retarding drag on the advancing tape.

As a further refinement, we preferably but not necessarily resort to a pair of centrally pivoted companion shoes or tape clamping jaws 90 and 9|. A bracket flange 92 may be attached to the center region of each disc side face as shownand respectively provided with an overhanging bored jacket 93 in which is mounted a tubular slide 94.

Said slide may be pneumatically actuated by a metallic bellows agency 95 to thrust the longitudinally grooved shoe 9| towardthe treated wire 31 and which bellows is pipe connected to a branch supply 24. The opposed complementary backing shoe 9!! may be provided with relatively small wrap circumferentially about the treated stock in order to attain a correspondingly enlarged cutting contact therewith. tape 86f is carried from its spool 13 over the idler roller 81 and beneath the shoe 9| into an angularly wrapped relation with respect to the treated wire 31 as detailed in Fig. 12. The tape may then be threaded around the companion idler roller 88 and interposed between said wire and the jaw roller 96, whereupon said tape is carried to the flanged driven feed roller 85. A tape clamping roller 9'5 may be pivotally mounted upon spring retained guide links 98 to obviate tape slippage about its feed roller. the spring tape may be carried to a take-off spool (not shown) or severed from time to time after accumulation. When dismounting a disc from its guideways, a corresponding looped tape end may be loosened and withdrawn from the interposed wire.

The widely divergent disposition given to each of, our tapes 86 and 86' allows the braded mate rial to freely drop or be blown away from their respective cutting zones. airinjector nozzle tubes such as 99 may be erected upongthe flange 92 and located between the respective divergent tape regions. Such injected fiuid may be supplied through the nipple E80 that connects with the branch pipe 24 to promptly remove any. abrasive material that may otherwise tend to lodge in such regions and also to partially cool the treated wire while being frictionally dragged.

Referring now to Fig. 17, this discloses a modified disc layout in which twin tapes are provided on each side face of the disc IiII. Here companion spools I02 and I93 independently supply the abrasive tapes IM and I05 as indicated by I dotted and dashed lines. Disposed around the spool I92 are multiple upstanding guide rollers I96 to I99 which carry the tape in a circumferentially cleared loop about the last named spool and into operative engagement with its feed roller III]. Said feed roller may be mounted upon a fixed tubular stanchion identical with the corresponding element 19 of Fig. 9 and similarly equipped with a stub shaft that extends through In Fig. 8, the abrasive The advanced free end of.

A pair of upstanding the disc Ifllitodrive thecomplementary feed.

tape I as shown. All of these gears mayxbe' simultaneously actuated in their arrowed directions by the flexible shafting 3E3. The roller layouts on both disc sides are identical except that as. indicated in dotted outline, the tape supply spools- IO2 .and Hi3 onone side .face may be angularly displaced by a certain lead angle A with respect to the corresponding full-lined spools on the other side face.

The underlying purpose-of said multiple rollers I06IIJ9 is to allow of "centralizing the required roller gearing wholly .to one side-of the disc center-line CD and thereby obviate having to spread apart the complementary feed rollers I Ill and II! into opposed disc regions. The bracket flange. I I 8 is provided with an actuated bellows agency and with reversely pivoted backing shoes I and IZI as detailed in Fig. v18. The treated wire 31 is interposed between the'tapes- I94 and I 05, the last named being preferably arranged to constitute a planiform cutting zone I 22 and its mated tape HM being divergently disposed. The shoe I26 may also be provided with a round edged flat zone I23 that lies inparallelism with the opposed zone I22 whereby to establish assured ba ancedtangential contact with the treated wire in reversed drag directions. The self-centering abrasive grip of said tapes represents a preferred embodiment in not being modified by a limited sag or the like lateral shift on part of the tensioned wire 31.

The disc IilI is again provided with a radial slot I24. In order to clear said slot for unobstructed disc removal, the idler roller I25 for the tape I65 is preferably retractibly mounted to swing out of the way about the pivot I26 into its dotted non-overlapping slot position. A set screw I21 locks said roller in operative position.

If desired, such idler roller may also be non-retractibly mounted in its dotted position, in which event the corresponding tape backing shoe'edge should be more bluntly rounded.

Such cleared slot afiords an advantage in that when the slot I24 is directed downwardly into our housing, the disc 'IUI may be freely hoisted upwardly without entanglement with a work piece 31 when previously threaded through our housing, although all tapes 'on the removed disc remain engaged about their respective spools. Upon being completely reloaded, the respective tapes of said disc assembly unobtructedly straddle such work piece while the disc is being dropped into its guideways.

The mode of operation of the described instrumentalities is thought to be obvious. For one pass grinding operation on high tensile strip stock, it is preferred to resort to a pair of tandem housing units each comprising some 8 to l2 compartments such as ZIA, 213, etc. The first entered of such units may be charged with coarse grit tape. By a proper setting of the finger tip control 33, such tape may be advanced at a rate appropriate for a given stock size to obtain a comparatively fast abrasive action. The second unit may be supplied with finer tape or the same coarse grit tape may be independently set to ad vance such tape at a relatively slower rate to bring about a grit loading effect adapted to impart a brilliant longitudinally. stroked; finish. to

the treated product; 1

The large stock of tape provided is ample to last for days of continuousoperation andtsufiicientto treat many tons-of wire. When the tape supply needs to .be'replenished, spare'multiple discs may with their completely assembled tapes, be quickly substituted for spent discs without undulyholding the machineout'of commission. It will beobserved from Fig. 6 that the compartmental span W is kept at a minimum so asto compactly install the maximum of tape width into a given overall housing length. In addition, the 9 rate of tape feed which should be varied with the size and tensile strength of the treated wire, is 1 placed .under full control :for each individualhousingand may be altered at will while .the wire is being abrasively treated.

The fact that the wire grip mechanism is pneumatically operated in clutch fashion and'the respective tape clamping jaws may in a like'mane her be relieved, permits. of easy motor starting, particularly in conjunction with the clutch lever 4 I. When working for a single pass performance," the accompanying gross tapedrag may highly The use of tension wire of small diametral size. our individual grip mechanism for each housing unit stepwise relaxes the ultimate wire pull and hence allows of successively employing groups of wide tapes without exceeding-a. given allowable stress. This aspect -is of special significance where mill run lengths are-welded endwise to make up a suficiently long wire to fill the drum of a large supply reel, as contemplated.

The foregoing disclosure will it is believed, make evident to those skilled in this art, the outstanding'commercial advantages afforded by our'novel improvements. It will be obvious that certain structural aspects of our housing discs and carried tape assemblies are likely-to find application to purposes other than the superficial polishing or grinding of metallic strip "stock and we reserve the right to correspondingly modify the illustrative disclosures, all without departing from the-spirit and scope of our invention heretoforev describedand more particularly characterized in the appended claims.

We-claim:

1. A grindermachine comprising a housingequipped with'a' pair of spaced guideway means;

independent partition means demountably piloted by the'respective guideway means, saidpartition meansbeing each adapted to have a com-- mon elongated workpiece entered therethrough, an abrasive element carried by each such partition means as a self-contained unit for bodily removal therewith, saidelements being respec-' tively brought into operative engagement with the work piece to constitute separate cutting zones therealong, means for feeding said elements toward their respective zonesyand means for dragging the work the aforesaid cutting zones.

2. A grinder machine comprising a housing equipped with arcuate guideway means, a partition disc mounted to rotate guideway means and which disc is adapted to have an elongated work piece entered therethrough, an'abrasive element carriedon each side face of said disc, said elements being respectively brought into operative engagement with the work piece to constitute separate cutting zones therealong; drive means carried by said disc for simultaneously advancing the "aforesaid elements toward the engaged work piece, releasable" piece longitudinally through manually in said meansservin to retain said disc against unwanted rotation, and power actuated reel means for dragging the work piece longitudinally.

3. A compartmental grinder machine comprising an axially split tubular housing which is interiorly equipped with a series of arcuate guideways respectively disposed in spaced relationship lengthwise of the housing axis, a separate selfcontained disc assembly for each such guideway with corresponding perimetric disc regions demountably inserted therein and which disc assemblies respectively carry a supply of abrasive tape of finite length, such successive discs each being adapted to have a common elongated work piece, entered therethrough and the several tapes being brought into operative engagement with said work piece to establish angularly staggered cutting zones that are distributed to effectively embrace the entire work piece profile, feed roller means also constituting a complement of each such disc assembly and serving to advance their respective tapes onward toward the cutting zone thereof, and means for dragging the work piece longitudinally. 4. A complemental grinder machine comprising trough shell means including transverse partition means adapted to have a longitudinally movable work piece entered therethrough, an abrasive element carried by said partition means and which element is brought into operative engagement with the work piece, driven rotatable feed means upheld by said partition means and serving to advance the said element toward said work piece, driven line shaft means disposed lengthwise of said shell means and upheld exteriorly of the perimetric confines of the partition means, said line shaft means including an operatively connected stub spindle of which one end extends through the shell means, and a flexible shafting length mounted interiorly of said confines and serving to couple the extended spindle end with the driven feed means.

5. A compartmental grinder machine comprising a housing equipped with a pair of spaced arcuate guideways, separate partition disc means of which their respective perimetric regions are rotatably and independently piloted by the respective guideways, said disc means being each provided with an open ended radial slot adapted to have a common elongated work piece dragged through the inner slot end region and which several slots when rotated into registry serve to unobstructedly pass the work piece lengthwise of such slots, an abrasive element carried by each such disc means and which elements are brought into operative engagement with the dragged work piece, means advancing the several elements onward toward their respective cutting zones, and means for dragging the work piece longitudinally through the aforesaid inner slot end regions.

6. A surface grinding machine comprising a compartmental housing equipped with a series of laterally spaced partitions each adapted to have a common elongated work piece dragged therethrough, an abrasive element for each such partition and which elements are brought into operative engagement with the work piece, a supply reel and a take-up reel located in tandem with the housing and respectively cooperating with opposed end regions of the dragged work piece, and a power driven grip mechanism arranged to tightly clutch a treated rectilinear leading work piece portion and thereby drag an untreated trailing work piece portion through the several partition apertures, said mechanism being interposed between the housing and the take-up reel.

7. A surface grinding machine comprising a plurality of housings respectively adapted to have a common elongated work piece dragged therethrough, a series of abrasive elements for each such housing and which elements are brought into operative engagement with the work piece,,

a supply reel and a take-up reel respectively cooperating with opposed end regions of i the dragged work piece, and a. power driven grip mechanism applied to at least one such housing and arranged to tightly clutch a leading Work piece portion for delivering the work piece to the take-up reel in a condition substantially relieved of drag tension.

8. In a surface grinder machine provided with abrasive elements, a grip mechanism including complementary pulley driven endless belts respectively comprising a spanning length component reversely arranged in superimposed flatwise adjacency to travel in a common direction at substantially the same linear velocity and adapted to have an elongated treated work piece tightly clamped lengthwise therebetween, a supply reel and a take-up reel disposed in tandem with said mechanism and respectively cooperating with opposed end regions of the dragged work piece, clutchable motive means for driving said complementary belts, and slippable clutch means tending to overdrive the take-up reel with respect to the aforesaid linear travel.

9. A surface grinder machine comprising a compartmental housing equipped with a series of laterally spaced partitions, each adapted to have a common elongated work piece dragged therethrough, an abrasive element for each such partition and which elements are collectively brought into operative engagement with the work piece, a supply reel and a take-up reellocated in tandem with the housing and respec-- tively' cooperating with opposed end regions of the dragged work piece, and a power driven grip mechanism provided with complementary endless belt means respectively comprising a spanning length component reversely arranged in superimposed fiatwise adjacency to travel in a common direction and adapted to have said work piece interposed therebetween, said mechanism further including a series of successive-backing rollers mounted behind the outermost face of each such spanning length component in opposed axial registry and which reversed counterpart roller serie respectively serve to clamp said length components into gripping engagement toward the interposed work piece.

10. In a surface grinder machine, a grip mechanism including complementary pulley driven endless belts respectively comprising a spanning length component reversely arranged in superimposed flatwise adjacency and adapted to have an elongated work piece grippingly interposed therebetween, a separate clutchable backing roller retractibly mounted behind each such spanning length component in aligned axial registry with each other to grip said work piece, and fluid controlled means serving to actuate and set the grip of said backing rollers.

11. In a surface grinder machine provided with an abrasive element for treating an elongated work piece, a grip mechanism including complementary pulley driven endless belts respectively comprising a relatively wide spanning therethrough, twin abrasive tape spools together with idler rolls and driven feed rollers respectively mounted upon a side. of each partition to constitute a demountable unit, the tape from one such spool being initially brought into operative engagement with the work piece and thence carried circumferentially around the major portion of said one spool over certain idler rolls to a contiguous feed roller, and means for dragging the work piece longitudinally through the aforesaid partition plates 13. A surface grinder machine comprising a compartmental housing equipped with an arcuate guideway, a partition disc mounted to rotate in said guideway, said disc being provided with an open ended radial slot adapted to have an elongated work piece entered through the inner slot end region, an abrasive tape carried on each side face of said disc, said tapes being respectively brought into operative engagement with the work piece in spaced edgewise relationship, driven feed roller means carried by said disc for simultaneously advancing the tapes onward toward the engaged work piece, an idler roll arranged to divert one of the advanced tapes from a rectilinear course, said roll being mounted to shift into alternative positions with respect to the disc slot, and power actuated means for dragging the Work piece longitudinally.

14. A compartmental surface grinder machine comprising a longitudinally split tubular housing including a semicylindrical base component and a mated cover therefor, dual guideway means perimetrically disposed interiorly of and d laterally interspaced along said housing component at a distance less than the cylindrical bore size, independently demountablepartition discs whose perimeters are respectively piloted withingsaidguideway means and serving. to complete a housing compartment: therebetween, :s'aid discs being respectively'adaptedto have-a common elongated work piece entered therethrough, pluralabrasive tapes carried upon each inner face of saiddiscs for bodily removal with their respective discs, said tapes being collectively brought, into operative contact ,withethenwork piece, to constitute multifold. regional cutting zones. whose combined .,length;..measured: longitudinally of the workpiece is greater than: the lateral spacing of said discs, actuatedfeed means carried by each such disc andserving toadvance the tapes thereof toward -.their1-respective" cut-.- ting zones, driven .line...sha'ft.;meansl disposed exteriorly lengthwise .of said housing compartment, disconnective transmission means extending transversely. inward through :said. tubular housing and when coupled serving to operatively interconnect the line shaft. means-with each of the several feed means, and means for dragging the work piece longitudinally through the aforesaid cutting zones.

15. A compartmental surface grinder machine comprising .a longitudinally split tubular housing including .a mounted base component and a mated cover therefor, a succession of interspaced guideway means arranged adjacent to the base perimeter, independently demountable partition means-whose. perimetric regions are respectively piloted by said guideway means, said partition means being, respectively adapted to have a common elongatedwork piece threaded therethrough and each of which partitiommeans individually have the following cooperative accessories, assemlc' ledthereon namely: a pair of tape spools, an actuated feed roller for each tape, and a train of spur gears operatively interconnecting the feedrollers ofeachsuch disc,said partition assemblies being respectively driven by common line shaft means-disposed exteriorlylengthwise of the enclosed housing and which line shaft-means include disconnective transmission means extending .transversely inward through said housing, the aforesaid transmis-- sion means Whencoupled respectively serving to operatively interconnect the several feedrollersto run in synchronismwith theline shaft means and whenuncoupled-permittinganyone par-- tition means together with its accessories; to be bodily demountedout of said base.

LOUIS I-LLMER VERNON'R. PALLAS.

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