US1936991A - Sanding machine - Google Patents

Description

NOV. 28, B. D P|NKNEY SANDING MACHINE Filed May 18, 1929 tion of This 1 invention relates .to a' sandingr machine'- and hasy particular reference to that `type fof; Y machine havinga seriesoffrotary sandingvdrums; jlnfattempts to use rotary "sanding, drunismfor the-purpose ofziinishingl the surface of wood; 'it' has been 4'found that the szmdpaper,v isf f likelygto produce striations or s cratchesjin the jsu'rface of the wood extending in the direction"A of movement' ofthe wood through themachinajlnvordgrto avoid such longitudinal scratches; it* has i been" ,Y customary top oscillate oneior inoreof the nal sandingdrums inj an yaxial direction.v This serves to afvery, `considerable1 exiqen1', to f eliminate .the scratches referred to,ibut' nefwavy marks, known as snake marks," generally result and 'are "objec-v tionablejifl averyfs'm'ooth surface is desired' i I Besides thesejsnake marks, drums ofthe type heretofore ,used have axially e'pigtenling vopenings at their-'peripheries' which thejendsgof the sheets oi, sandpaperr coveringkjthe are clamped.V As vthe resulting interrupted]portionV ofthe sandingvsurface strikes' thefwood being sanded, a" transverse' revolutionl niark may ,'refsult,v so 'fthatv the final' surface produced ons the wood consists of Aa seriesnr of i inter'sfectingiA 'scratc'l'iWL It is accordingly customfy, btheh*production ofy nne work, to use a separate, b elt's'ander of a handA` operated type having a veryneigiiade of sand-l, paper thereon, to. smooth out 'theiresulting scratches with' theproduction of a highly smooth surface.

It is the object of the present invention to inf corporate in a sander including av plurality of sanding drums a final sanding device of a belt type to remove the marks which may result from the sanding drums. Detailed objects of the invention relate to the provision 'of an 'improved nishing sanding device so arranged that change or'replacement of the sanding beltis easily accomplished, and arranged so that'adjustmentsA may readily be made for the production of varying types of work.

In the drawing: y Fig. 1 is a side elevation partly in'section of fa machine embodying the present invention; Fig. 2 is a section on line 2-2 of Fig. 1; and Fig. 3 is a detail of the shoe which holds the sanding belt upon the work. f

The vmachine is illustrated herein somewhat diagrammatically, inasmuch as, in general, it incorporates the features of well known machines, such as, for example, the type shown in the patent to Perry, No. 657,357, dated September 4, 1900. Reference to this patent will show details k:55v relating to the drivingconnections and adjust- SANDING `imonumby.. The right ments` which are "omitted from'the resen closurenforthe sake' of clearne'ssa machine consists 'of a ase-'2in ted'a"s1iitb1 feedillgdevlce omprises atei-thief: the; eol typef shown inf the {Perry-'ipatentij -Rotataloly` mounted in v*suitable bearings carriedfbyffa side frame, orjby adjustablev members `mounted`,on the" side'irames', are sanding drunsg and betfyv'en"v whichare' located suitable"guidingshoesy '1' '2' k 14, which serv k face of the-wood being sanddltotne-sand g drums.` The l"first drum isadapted to carrvy coarse* sandpaperand'serves'ifor the rodgh-fremoyal'fof. the"`surfa'ce' of the' work. 'I not'70i oscillated vaxiallyk 7 f se'cgnduifum-e whicnm'th stance, is the; -iinal,sanding'drumgfis'w I l axially by ys1iitable'jcox'mectiontlto the uppere'nfd of a lever 416, thelower endf lwhich-'carries'anl ecfgrntricrA strap` surrounding anfeccentricon shaftl,rl driven -from a suitable? msourc of powerthrough*reductionl gearing -in 'ia` gear;=box-^20f While onlyA tgv/oY sanding'drums-arf herein' shown, it' is, siial to provide. three drums' the llast ftvvor ofA which are"oscillated4 and which produce-"nner work "so 'that the nishedsuriace' of rthe wood` emerges from the machine ina very'sxnoothfcori ditionfw' h, however, possibly some scrat'chesuo'fj- P' The improv which is moun A. inthe present instance', yc

thefjty'pe referred-to above. r A fMounted"onthe'reariof '-themachie lare Side frame members 22 and 24 rigidly connected together by cross bars and bolts. These side mem- 'bers are provided with slideways engaging 'over suitablebearing tracks 25 or the like carried by 90, the side frames of the machina, vso that a trans- Vverse oscillatory movement may be imparted to the frame members andA the parts carried there-- -hand frame member 24 as shown in Fig. 2 is provided with slotted ears 26 through the slots in which extend pins 28y carried by frame 2, the slots permitting the sidewise movef ment of frame member .24. `Oscillatory movement transversely of the direction of feed of the work is imparted to the frame members through 100v the 'medium of a lever 30 provideduat its lower end with an eccentric lstrap embracing/an' eccentric on shaft 18. At the upper end of lever 30 is lpivoted a, link 32 carrying a pin`34 which may be received rwithin slots inr ears wardly from frame member-22. Manual tilting of lever 32 serves todisengage pin 34 from' the slot when itis desired thatv no'oscillatory movement be Vimparted to the'frame members` and when it is desired to replace ja sanding belt.

e 'to fproperl'ypresent th(y sur j extending out- 1 05 ile.

Mounted in frame membersy 22 and 24' are sanding vbelt carrying rollers 36 and 38. rMotion is imparted to drum 6 by meansof a belt'40 trained overa pulley carried by the shaft of this drum.V TheV shaft of this drum and the shaftsVof drum 8 and roller 36 carry sprocket wheels over whicheis trained a silent chain or other sziitable belt`42 serving to impart ,simul- 'taneo'usro't'ation'to'all shafts inthe directions indicated by the arrows.` Y Y Over rollers 36 and 38 is trained a sanding belt 46 of'ne lgrade adapted to produce a highly' smooth surface on the work. A shoe48 'extend-- ing transversely of the machine and carryingk preferably a Iiexible sheet metalplate 50` backed by felt or similar material, carries upstanding bolts 52, two at each end thereof, which'are slid-` ably` mounted through apertures inta. carrying plate 53; These bolts are Vprovided at their up.-

per ends with nuts 54, while springs 56 are lo-' cated; around each of the bolts between shoe 48 and plate 53. It will thus be seen that adjustmentof nuts 54 will serve to vary the tension of springs.v 56jand accordingly the pressurenrvo'f the shoeuponxthe'lower lap of the belt 46.v Adjustingscrews 58are journalled in cross member 60 and threaded into plate 53. The upper ends Kof these screws carry worm wheels 61 meshing with Worms carried by la Vshaft 62 journalled in frame members 22 andl 24 and carryingav suitable'A crank 64.` It will be obvious that-inanual ro- 'tationof the crank 64 will serve to vertically adjust plate 53 whereby shoe 48 may be adjusted vertically to `suit, the'work being sanded.k Upxj wardmovement ofplate53 will serve to lift shoe 48 from the work by engagement withl nuts 54 so. ast() facilitate the,:replacementl ofthe belt 46. j--It willbenoted that frame member 22 is within the outline of beltf46A as shown inFigl, that is, that'the'side membersof frame 2 v,extend upwardly ,beyond the..` lower. lap ,of vthijs belt. When itvlisdesired to replace. the belt 46,A pin-*34 is disengagedffrom the slot in whichit is received and the entire structure, comprising .frame members .22 .and 24, rollers 36 and 38, and the shoe land its carrying partsmay be tilted upwardly-,about pins. 28v as pivotsmThe old belt I46 maythentbe removed from-rollers 36 and 38.and a newbeltl substituted,

From the above it win be seen` thatfthere 4is' provided in amachine provided/with thel usual sanding drums a belt sander which may be of a type adapted to remove all scratches or marks from the surface of work acted. upon by the sanding drum. It will also be seenthat an arrangement isprovided whereby, while proper operation is attained, the replacement of the sanding beltsis greatly facilitated.

What yI claim-and Patent is': 1

l. A sanding machineincluding 'a main frame, a

esandingdrum, a belt sanden'and means for feeding Work from the sanding drum `to ,the belt Sander,g,said belt sander including a supportingy frame, and means carried by the supporting frame for'mounting abelt,v said supporting frame being releasiable from the main frame to provide clearance'for the-replacement of the belt.

t 2.y A sanding. machine including a main frame, aisandingy drum, a belt sander, and means for feeding work from the sanding drum to the 'belt sander,l saidbeltlsander including av supporting 'frame' means carriedby the Ysupportingy frame for mounting a2belt,fsaidxsupporting frame being Areleasable from `the main frame to provide clearance for the replacement yof the' belt and means for,` oscillating the Vsupporting frame,

desire to protectby Letters y 3. A sanding machine including a frame, a

sanding drum, a belt sander, means for feeding work from the sanding drum to the belt sander, and mean's'for oscillating the belt sander trans'- ver'sely to the direction ff'feed.

' 4."A` sanding machine gincludingfa farnea,

sanding drum,"a belt sander, means' for feeding work from the, Sandingv drum '-to thel beltV sander, and means for oscillating theblt lsandertranlsby the supportinglfraxnleformounting a beltsaid supporting framebeing pivetabl'e relativen te the main frame to permit 'replacementfof fthe belt,

the.beltbeingniovableover a portion of the su' porting. frame." t

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