US1124657A - Sanding and polishing machine. - Google Patents

Description

s. o. mms a@ W. F. Smm. SANDING ANB POLISHING MACHINE. APPLICATION FILED MAR. 12', 1914.

Patented Jan. 12, 1915.

4 SHEETS'SHEET 1.

33 6 07 @a 1X9 J 0 si U ATTORN EY J. C. PRIMS & W.- F. SMITH.

` SANDING AND Pomsmm MACHINE.

APPLICATION FILED MAR. l2, 1914.

" Patented Jan. 12, 1915.

4 SHEETS-SHEET 2.

ATTO R N EY 1. c. PRIMS & w. P. SMITH.

SANDING AND POLISHING MAGHINE.

APPLICATION FILED MAE. 12, 1914,

1,124,657. Patented Jan. 12,1915.

4 SHEETS-SHEET 3.

Aff/@5.

ATTORN EY 5. c. mms @a W. F. SMITH, SANDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 12, 1914.

Patented Jan..12, 1915.

ATTORNEY y UMTED STATES PATENT' omen.

JOSEFH C. PRIMS AND WILLIAM F. SMlITH,l HORNELL, NEW YORK, VASSIGNORS T DUPLEX MOLDING SANDER COMPANY, OF HORNELL, NEW YORK, A CORPORATION or NEW YORK.

SANDING AND POLISHING MACHINE.

specification of Letters Patent. Patented Jan. 12, 1915.

v(Jontinuation of .j app1ieation Serial No. 716.647, filed August 2B, 1912. This apphcation filed March 12,

' 1914. seria1No.824,21s.

To ZZ 'whom it may concern;

Be it known-that we, JOSEPH C. PnIMs and WILLIAM F. SMITH, citizens of the United States, residing at Hornell, in the county of Steuben and State of ANew York, have invented a new and useful Sanding and Polishing Machine, of which the following is a specification.` K I' The invention relates to improvements in sanding and 'polishing machines, and the present application is a continuation of an application filed by 'us August 23, 1912, Se-

. rial No. 716,647, for the same invention.

. ments. only7 a small amount of the abrasivey The object of the present invention is to improve the construction of sanding and polishing machines and to provide a simple, efficient, and comparatively inexpensive machine. adapted to permit the use of coarse and. fine abrasive or polishing material at the saine time, and capable of easy adjustment whereby sand papering or like abrasion of the surfaces of molding or other material may be effected.

A further object of the invention is to provide a machine of this character in which the operation of sand papering or polishing will be continuous and in which the feeding in and feeding out of the material operated upon-may be eifected without adjusting or altering the position of the abrasive or polih'ing means and without stopping the mac une.

Another object of the invention is to pro` vide a machine for sanding or polishing moldings and other stock capable of operating ata high speed with minimum vibration, whereby a' maximum amount of material may be operated on in a given length of time, and in which, owing to the relatively high speed of the sanding or polishing eleor polishing material will be required on the stock, thereby7 reducing the consumption of such polishing or abrasive material to a minimum.

A 'further object of the invention is to prox-ide a sanding and polishing machine in which the movements of the elements carry- Ying the abrasive or polishing material will be confined witllin a stroke of from one Vinch and a half to three inches in length, or thereabout. so that the molding or other` stock operated upon will have auniform surface.

A further object of :the invention is to provide mechanism vadapted to `acfwate two invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawings, and ointed out in the claims vhereto appende it being understood that various changes in the form, proportion, size and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit or sacriicing any of the advantages of the invention.

In the drawings; Figure 1 is a front elevation of a sanding and polishing machine constructed in accordance with this invention. Fig. 2 is a rear elevation of the same. Fig. 3 is a plan view of the machine. Fig. .4

is a central long {itudinall sectionalview of the same. Fig. ,5 is a cen'tral transverse sectional. view of the machine. Fig. 6 is an enlarged detail vertical vsectional View on the line 6-6 of Fig..'1. Fig. 7 is a similar View on the line 77of Fig. 1. Fig. 8 is an enlarged detail sectional view taken longitudinally of one end ofthe machine, illustrating the arrangement ofthe upper and lower feed rollers with relation to the grinding and polishing elements. Figs. 9 and 10 are detail sectional views illustrating the manner of adjustably mounting the lower feed roller. Fig. 11 is a detail horizontal sectional view through. one ofthe grinding 'and polishing elements. Fig. 12 is a detail plan view of the train of gearing for transmitting motion from the pullevs to the upper and lower feed rollers. Fig. 13 is a plan view of the friction clutch for throwing the machine into and out of operation. Fig. 14 is a detail sectional view illustrating the construction of the belt tightener.

Like numerals of reference designate corresponding parts. in all the figures of the drawings.

In the accompanying drawings, in which iS illustrated the preferred embodiment of 1 fverse webs. or partitions 6. The supporting column 2 is also provided at the top with a horizontal web or partition 7 constituting the bottom of the suction chamber. The

' main frame of the machine is provided at the rear wall of the suction chamber with lan opening 8 and it has a coil or flange 9 eX- tending outwardly therefrom and designed .to be'connected with a suitable vacuum suction'device.' The front portion of the top 10 ofthe main frame constitutes a table 11 l and the mainframe is'provided at the back of the table l1 with hooded suction inlet openings 12 of substantially oblong form, opening or facing toward the frontv and extending longitudinally of the machine and located in rear of front and rear sanding and polishing elements 13 andy adapted to convey away the dust. The main frame of the machine is also provided at the front wall of the suction chamberl with an enlarged opening 14, normally covered by a removable closure late l5 secured by screws or other suitable fastening deviceto the main frame and adapted to be detached to permit ready removal of dust accumulat in within the suction chamber 4.

ounted upon-` the top of the machine, at the center thereof, is a bearing bracket 16 secured by bolts or other suitable fastening device to the main frame at the rear portion of the to 10 and provided with a front casin'gl'? havinga rearwardly extending approximately L-shaped arm 18composed of a lower inner horizontal portion and any outer upwardly extending vertical portion terminating in a bearing 19 arrangedV in alin'ement with the front casing 17 and receiving the rearvend of a double crank shaft 20. The crank shaft 2O is journaled at its front end in a bearing21 of the casing, and the bracket is provided at the back of the casing with an intermediate bearing 22, which receives the central portion of the double crank shaft 20. The crank shaft 20 is provided with t-Wo cranks orcrank bends 23, designed to be of a length to reciprocate the 'sliding shoes or elements from an inch and a half to three inches or thereabout and disposed diametrically opposite each oth lr and connected by'rods 24 with'the san ing andk polishing elements 13, whereby when the crank shaft is rotated,`the sanding and polishing elements .will beu simultane-v ously reeiprocated in opposite directions, so that the grinding' and polishing action of each of the said elements 13 will'counteract the other, and thereby prevent such sanding and polishing of the material from interfering with the fgedingof the latter into and out of the machine. The casing 17 is to permit the molding or other materialoperated on to pass beneath it. I

vThe bearing bracket is provided at oppo-v site sides 'of its intermediate portion with .spaced vertical dovetailed guides 27 having inwardly beveled side edges and receiving vertically adjustable supports consisting of yokes 28 disposed transversely of the niachine and composed of front and rearsides and connecting top portions, the rear sides being provided at their inner opposite faces with vertical dove-tailed grooves29 to re ceive the vertical guides 27,' whereby the yokes are slidabl interlockedvfwith 'and adjustable vertical y on the guides 27. The yokes are equipped at the rear walls' of the dove-tailedgrooves 29 with .adjustable wear plates or shims 30 controlled by screws 3l mounted in threaded perforations ofthe rear' walls of the dove-tailed grooves 29 and adapted to be adjusted to take up the Wear. The front and rear sides of the vertically movable yokes are equipped with horizontally alined, longitudinally kdisposed front and rear arms 32 consisting preferably of rods securedat their inner ends in openings of the sidesv of the yokes 28 by nuts 33 or other suitable fastening means. The arms 82, which are preferably rounded, eX tend outwardly from the yokes and they slidably support the reciprocatory sanding and polishing elements, which consists of shoes, and present, in their construction, spaced sides or members 34 and a clamp 35 secured to the lower portions of the spaced sides or members and adapted to detachably engage sanding or polishing blocks 36. The spaced sides, which have transversely alined Openings 37, are provided at their tops with longitudinally disposed sleeves 38 slidablyarranged on the guiding arms 32 of the yokes. The transversely alined openings 37 rreceive transverse pins or pivots 39 which pass through cross heads 40 carried by the outerends of the connecting rods 24. The cross heads 40A extend lacross the spaces between the sides 34 of the sanding or polishing slices, and the connecting rods operate in the spaces between the sides of the yokes 28. Each clamp is composed of a relatively Xed section ll and an adjustable section 42, the sections being provided at their front and rear sides with upwardly extending longitudinallydisposed flanges 43 and 44 and having'depending transversely Ydisposed inclined flanges 45 and 46,- which present downwardly 4and inwardly inclined faces to the .sanding or polishing blocks and form beveled jaws for engaging the same.

The flanges 43 are bolted to the spaced sides or members 34, and the other flanges 44 are provided with transversely alined horizontally disposed longitudinal slots`47 receiving a rod or bolt 48 which pierces the sides 84 and slidably connects the relatively adsquared to receive a wrench or other tool, .j

is provided adjacent to the squared portion with a collar whichbears against the outer face of the lug 49 of the relatively fixed section 41. The diametrically opposite cranks are arranged as close together as possible, and in orderto compensate for the cross'head pins 39 are located at a point beoffset position of, the connecting rods, the

tween the guides'20 and the sanding and polishing blocks, and the'metal in the sliding shoes is so distributed that the same will balance along the central plane of the connecting rods. This construction and arrangement will enable the sliding shoes to be reciprocated at a relatively high speed, and at the same time will eliminate lateral and vertical vibration, and it has been found b v experience that the adjustable crank shaft may be rotated from eight hundred to twelve hundred revolutions per minute, without appreciable vibration. The sanding and polishing blocks are designed to have portions 36a shaped to conform to the configuration of the vmolding or other irregular surfaces covered with suitable abrasive or polishing material.

The vertically slidable yokes are limited-1' in their downward movement by vertical manually operable adjusting screws 53 eX- tending through upper and lower vertically alined lugs 54 and 55` vat the rear sides oi' the yokes and having lower threaded portions 56 for engaging the lugs 55. The up'- Aper lugs 54 are equipped with clamping screws 57 which are adapted to engage the upper portions of the screws 53 for securing the -same in their adjustment. The screws,

' which are provided at their upper ends with heads or other suitable Voperating means,l

Y project below the planes of the abrading and polishing blocks 36l and restupon the top of the table and limit the downward movement of the ydkes and the slidable 'sanding and polishing shoes, and enable the said blocks 36 to bear upon the molding 58 or other stock with the desired pressure. The yokes 28 are also provided with rearwardly eX- tending lugs 59 in which are secured the upe per ends or rods 60 extending downwardly to the base of the frame and pivotally connected to rocker arms 61 of transverse rock shafts 62. The rock shafts 62, which are journaled in suitable bearings of the sup- ,y

porting column, are equipped at their front ends with treadles 63 adapted to be depressed by the operator for lifting the sanding and polishing shoes either simuitaneously or independently to permit the sandf ing and polishing blocks to be removed and depressed. The locking bars are swung out of lengagement with the keeper when it is desired to lower the yokes 28 and the weight of the yokes and the mechanism carried thereby is proportioned so as to counterbalance suliiciently the weight of the treadles and the locking bars to produce the proper pressureebfrthe sanding and polishing blocks on the molding or other stock.

The table of the lmachine is equipped with a laterally adjustable guide bar 68 extending the entire length of the table and `provided at its ends with depending lugs (Saga-nd provided at one end with a clamping 'screw 70 piercing the adjacent. lug and detachably ,engaging the adjacent end of the frame of stock operated on by the machine, and it co-` lio acts with front guide rollers 71 and 72 arl ranged at the front of the machine. guide roller 71, lwhich operates in a vertical plane, is carried by an oscillatory arm 73 pivctally mounted on the main frame of the' machine andadjustably' secured to the same to maintain the guide roller 71 inthe desired position. The guide rollers '72 `are carried by horizontal rods or stems-74 which are adjustably mounted on vertically adjustable rods or pivots 75. The horizontal rods or stems 74 are adapted to be rotated and also capable of sliding inwardly and outwardly throughthe vertical rods lor pivots, whichv The i are adapted' to -be' raised and lowered and also rotated to coperate with the horizontal rods or stems '74 in properly positioning the A guide rollers 72.

The molding or lother material is fed into and out ofthe machine by upper and lower feeding rollers 76 and 77. The lower feed rollers 77, which are located nearer the ends of the table and farther from the sanding elements 'or shoes than the upper feed rollers, are mounted below the table and projzectv upwardly through slots Vor openings 8 ythereof and extend slightly above the plane ofthe top of the table, so as to support-the molding'or other material slightly above the table'- for 'enabling the material op erated on to be slightly'iexed by the upper feeding rollers and held flat against the table, where the'material is operated on by the sanding and polishing blocks. A pair `of upper and lowerv feeding rollers is ar ranged at each end of the machine, and the upper feeding roller 76 is mounted on the front end of a transversely disposed shaft 79, journaled in a bearing sleeve 80 ofv an oscillatory arm 81, which is provided at its pivoted end with a forwardly extending pivot 82 and a rearwardly extending spindle or stub shaft 83 which is arrangedv concentric with the forwardly extending pivot 82. The pivot 82 is mounted in a suitable bearing .84, bolted or otherwise secured to the rear portionl of the top of the main.

frame, andthe said pivot 82, which extends into the bearing from the rear end of the same, is provided with a projecting screw 85` on which is mounted a friction disk or washer 86 and a nut 87. The oscillatory arm is equipped with asuitable handle 88 and is adapted to be swung upwardly and downwardly to arrange the upper feeding roller in proper position withrelation to the lower feeding roller, and it is secured in its adjustment by the friction disk or'washer, which is clamped against the front of the bearing 84 by the nut 87. The oscillatoryarm 8l extends downwardly and inwardly at an inclination from theO pivot 82, and in swinging upwardly to lift the roller to accommodate molding or other stock of increased thickness,` the engaging portion of the periphery of the upper feeding roller is carried away from the supporting portion of the periphery of the lower-feeding roller, as indicated bythe dotted lines a-'b in Fig. 8 of the drawings. This increased distance between the engaging portions of the upper an lower feed rollers enables heavy material to bemore readily bent or iiexed for forcing the portion operated. on by the grinding elements in contact with the table, so that the portion 'of the material operated on will be maintained in a horizontal'position on thetable. c 4

. The upper and lower feeding rollers. at

' with a serrated peripheral wall.

each end of the machine, are simultaneously `rotated and positively driven by pulleys 88* mounted on horizontal stub shafts 89 secured to and extending rearwardly from the main frame of the machine near the ends thereof. The feeding roller driving pulleys; which have lgrooved peripheries to receive a belt 90, are provided with spokes 91 hav# ing laterally bent outer terminal portions which inwardly 'offset the rims of the driving pulleys 8 8 `from the hubs thereof. Each driving pulley .88 is'provided at the inner or front side with .a pinion 92, meshing with a gear wheel 93 which is mounted on the -stub shaft or spindle 83 of the oscillatory arm 81. The gear wheel 93 is-proyidedt at its front side with a pinion 94 meshing with a gear wheel 95 which is mounted on the stub shaft 89, on which the drivingpulley rotates. The gear wheel 95 meshes with a.

pinion 96 mounted on the shaft 97 of the 100, which is adapted to be rotated to cause the lower feeding roller to project above the table to a greater or less degree,-is secured in its adjustment by a clamping screw 101 mounted on the frame of the machine and The eccentric bushing 99, whichl -is provided with a suitable operating handle les engigagingl the bushing 99,A as clearly illustrated in F ig. 1 0 of the drawings. The lower feeding roller is preferably provided The upper feeding roller is preferably smooth 'at its periphery, but any desired construction of I feeding roller may, of course, be employed.

The offset rims of the driving pulleys `88a partially house the trains of gears for communicating motion from the said pulleys to the feed rollers, and the belt 90 extends from the lower sides of the said pulleys to a lower pulley '102 of a stationary countershaft 103, suitably mounted in the supporting column of the main frame and located below and in the transverse vertical plane of the crank shaft. The countershaft 103, which extends rearwardly from .the main frame, receives a power driven pulley 104 and a relatively large main drivlng pulley'lO, which is connected by a belt 106w1th a pulley 107, mounted on the crank shaft and arranged in the lspace between the upwardly extending portionof the, L-shaped supporting arm 18 land' lthe "intermediate l a stop og abutment for preventing outward movement of the power driven pulley 104 on thef ountershaft.' A frictiony disk 110, ofapproximately thev diameterof the power driven pulley, is interposed between the lat- V ter and the driving pulley 105,`which is provided with a smooth friction face' 11]. for engaging the friction disk 110, whereby the driving pulley 105 is clutched to the power driven pulley. The pulley 102, which is relatively small, is suitabl connected to and rotates with the driving pulley 105, whereby the pulleys 102 and-105 will be rotated when the said pulley 105 is clutched' to the power driven` pulley 104. The pulleys 102 and 105 are preferably formed integral with each scther and constitute a single unit, but they may be connected with each other in anyother desired manner. The driving pulley is moved outwardly. on the countershaft' by a shifting lever 112, fulcrumed at an intermediate point and connected at one end with a ball-,bearing thrust collar 113, and at the other end with a cam lever 114 by a transverse rod 115. The shifting lever 112 is located at'the back of the machine, and the rod, which is mounted in suitable openings in one of the end portions 5 of the top of the main frame, extends froml the back thereof to the front of the same, its rear end being pivoted to the shifting lever, and the cam lever being similarly connected to the front end of the rodv 115. The shifting lever 112 is arranged at an inclination and the leve` 114,'which has a cam head, is adapted to engage the main frame for operating the upper end of the shifting lever forwardly4 and forcing the lower end thereof and the thrust collar 113 rearwardly to clutch the main. driving pulley 105 to the power driven pulley 104, By manipulating the cam lever 114 the machine is thrown'into and out of operation, and this construction obviates the necessity of employing fast and loose pulleys and a pulley shifting device. Also, the power driven pulley is adapted to be connected with any suitable source of power located either above, below or at one side of the counter- Shaft'.

The machine is equipped with a belt tightening device comprising a rock shaft 116 journaled in suitable bearings of the supporting column of the main frame and extending through the same from front to rear, and provided at its rear end with a crank arm 117 carrying -an idler pulley 118 whichfengages one of the lower stretches or runs of the belt 90. The belt 90 extends horizontally from one of the driving pul- 65 leys 88 to the idler pulley 118, and thence downwardly to the pulley 102. The front end of the operating-on rock shaft 1.16 is provided with an operating handle orlever 119 which is adapted to be operated to par-` tially rotate theshaft 116 to tighten the 70 belt. Also, by swinging the idler pulley' 118 downwardly and outwardly, tli'efbelt may be slackenpdfto stop or' check thef'eed-l ing of'the maternal 'when desired.A The operating handle or lever 119 is fixed to the. 7'5 A frontend of the shaft' 116, and a fiber'.

washer 120 is interposed between the;innery attached end of the operatingfhandlefani the frame of the-machine. -The crank/"arm '117 is slidably connected with thejrear cnil '8o.

of the shaft 116 by a key 121 mounted on the end of the shaft and operating inar groove or key way in the arm 117 The rear' end of the shaft is provided withl a threah ed bore or opening 122' for the reception of 85 an adjusting screw 123. 'Therear end" of the shaft 116 terminates short of the rear face ofthe crank arm 117, and the screw 123,.v is adapted to be tightened to clamp "the crank arm 117 against the frame of the ma`. y 90 chine, a liber washer 124 being interposed` between the inner end of thev crank arm. and the frame of the machine. A metallic washer 125 is mounted on the screw and is arranged between the head thereof and the l outer face of the crank arm 117. X'By tightif eningthe screw 123 the crank arm may be secured in any of its adjustments.

What is claimed is:

1. A.machine of the class described, ina- 100.

cluding amain frame having a relatively fixed table, positively driven feedingy means for carrying the molding along the table, spaced sanding or polishing elements arp ranged substantially in longitudinal alinement and slidable longitudinally with respect to thefeed of the material, and means for simultaneously reciprocating the said elements in opposite directions, whereby the abrasive action of each will 'counter- 110 act the other to prevent such abrasive action from accelerating or retarding the feed4 of the material through tli'e machine.

v 2. A. machine of the class described, including a main frame having-a relatively fixed table, means for positively feeding material along the table, spaced sanding or polishing elements arranged substantially in longitudinal alinement and slidable longitudinally with respect to the feed of the 12o material, a centrally arranged crank shaft located between the said elements and. having diametrically opposite cranks, and longitudinally disposed rods connecting the fering *with and accelerating orretarding '.thejfeedingof the material throughthe machine. f

' 3. A machine of the class described, in-

cluding a main frame, vertically movable supports, shoes slidably mounted on the said supports, mechanism connected with the shoes for simultaneously reciprocatmg the same in opposite directions, adjustable means for limiting the downward Inovement of the supports, and independent v manually operable means connected with the guidearms, a double crank shaft mount- 'edf between the yokes, and connecting rods connected to the shoes and to the crank shaft.

6. A machine ofthe class described, including a main frame, a double crank shaft, vertical guides located at opposite sides of the double crank shaft, yokes slidably mounted'on the guides and provided with 35 outwardly vextending arms, shoes slidable on the said arms, and comiec'ting` rodsex tending through the yokes and connected to the shoes and to the crank shaft.

7. A machine of the class described, in-

cluding a main frame having a central bear,

ing bracket providedl with a. casing and hav-l ing spaced vertical guides, yokes slidably -mounted on the guides at opposite sides of the casing, a double crank shaft mounted between thel yokesA and having oppositely disposed cranks located within the said casing, slidable shoes carried by the yokes, and

`connecting rods extending through the yokes and'connected at their outer ends to the shoes and at their inner ends to the said crank. v

y 8. A machineof the class described, in'- cluding a main frame, spaced vertically adjustable yokes provided with' horizontal guide arms arranged in pairs, sliding shoes composed oi spaced sides having openings through -which the said arms extend, clamps connecting .the sides of the shoes, a central crank shaft, and connecting ro'dsextending from the crank shaft to the shoes and pivoted to the samebetween the sides thereof.

9, A machine of the class described includin'g a. main fra-me, a support provided I withspaced guide arms, a slidable shoe composed ci Sidlldably mcuntedon. the guide arms, and a clamp. consisting'ofa relatively. fixed section rigidl secured to the sides of the shoe, and an a justable section shdably connected tothe sides of the shoe.

10. A machine` of theclass described, 111- cluding. a main frame, spaced vertically slidable supports, horizontally slidlng shoes mounted on the supports, vertical adJustlng .screws carried by the supports and arranged to limit the downward movement of the same, and 'separate manuallyl operable means connected with the .supports for rais# ing the-same, said operating means having levers arranged adjacent to each other and adapted to be operated either independently ,orslmultaneously i,

11. A machine of the class descrlbed, 1ncluding a main. frame, vertically slidable supports, sliding shoes carried by the. sup.- ports, rock shafts mountedl on the. mam frame and providedwith treadles, and sepa rate means for connecting the, rock shafts with the supports.

l2. A machine of the class described, in-

cluding a main frame, vertically slidable supports,l sliding. shoes carried by the supports, mechanism located between the supports and connected with` the shoes for re ciprocating the same, independently operable means for raising the supports, sepaclinedlocking bars connected at their lower ends with the treadles and having their upper ends slidable in the keeper, and provided with means for engaging the same.

14. A machine ofthe class described, in cluding a main frame provided with a table and having a suction chamber, said. main frame being also4 provided at the back of the table with longitudinally disposed hooded suctioninlet openings extending upwardly fromthe plane of the upper face of the table, sliding shoes arranged above the table opposite thel said inletl openings, and means for reciprocating. the shoes.v

l5. A machine of the class described, including a main frame provided with a table,

g and upper and lower feedrollers, the lower feed roller projecting above. the table, Aand the upper-feed roller having. its vertical axis A spaced inwardly beyond. thevertical-axis of;

thelower feediwheel andarranged toengage and., eatbematerial to hold; thesame .ngt 13 against the table, and l sanding 'or' polishing mechanism located above the4 table in posi- '1 tionfor operating on that portion of the ma- Y terial which is flat against'the said table.

16. .A machine of the class described, including a main frame having a table, a lower.

'^ .feed roller mounted beneath the table and projecting above the same, an oscillatory l arm mounted above the table and extending 410l llower feed roller, and-an upper, feedroller to a point beyondthe vertical axis of the carried by the oscillatory arm and arranged .f "tofengage thematerial at|` a pointspaced roller, whereby the upper 'feedroller iis polishing-mechanism located above the table j i in position for operating on that 'ortion 'l 20 l said.table'.

ofthe material which isheld fiat against the 1T A machine vof the class jdescribed, in-

l cludin'g a mainframe having a table, upper j projectingl above the table and the upperf feed rollers being inwardly offset from the and lower feed 4rollers arranged at the end portions of the table, theA lower feedl rollers 'I .vertical plane of the aXes. ofthe lower .feed

4AL -gaging that portion 'of the material whichv is. iiat against'the table, and mechanism for' te'rial at spaccd'points to hold the said material flat against the table, vsliding vshoes arranged above thetable in position for ensimultaneou'sly reciprocating the shoes in opposite directions to cause the abrasive action disk, and means for'transmitting motion from-the driving pulley to thev crank shaftand tothe feed rollers.l

ofone shoe to counteract that of the other .and prevent the shoes from affecting the feeding of the material intoand-out of the machine. a

18. Amachine ofthe class described, Aini cluding a main frame ha'ving a table, a lower feed roller projecting above thetable, an

.oscillatoryarm, an upper feed roller 'carried by the oscillatory. arm and arranged to yengage the material .beyond the vertical the said table.

..19. Ainachine of the class described, in-` cluding a main frame khaving a table, upper fand lower feed rollers arranged'in pairs at.

vp l'aney of the axis ofthe lower feed roller 'to' flex the material and hold the .saine Hat against the table, operating means connected with the said arm for raising and lowering the upper feed roller, means for locking the oscillatory arm vin its adjustment, and sandingor. polishing mechanism mounted above the table inv position to operate on that por-` tion' of the material which is held iatagain'st the end portions ofthe table, driving pulleys located at the ends of themachine, separate .trains of gears for transmitting. motion from the drivingl pulleys to 'the feed rollers and rollersand arranged to flex or bend the mafor permitting lrelative adjustment of the said upper and lower rollers, an actuating pulley, and belt connectngthe driving pulleys with thel actuating pulley.

20. A machine of the class described, in

cluding a mainfrainehavin a t'able,` sliding. shoes, a crank shaft mounte above the table A and connected with' and .reciprocating the sliding shoes, feed rollers arranged atthe end portions of the, table, a 'countershaftv mounted on the frame and located below the crank shaft; a driving pulley mounted on the countershaft, a power drivenpulle'yalso arranged on the countershaft, a friction ele' ment or member interposed between the -power driven pulley and the driving pulley,

ing shoes, a'c'r-ank shaft mountedabove the table and connected with and reciprocating the'- sliding shoes, vfeed rollers arranged at the end portions of the-table, a countershaft mounted on the frame and located below thel crank shaft, adriving pulley mounted on the countershaft, a -power driven pulley also arranged on the countershaft, a friction disk sov mounted on the counter-shaft and 'interposed between the said pulleys, shiftingmechanism having a -thrusticollar for maintaining the t said pulleys in engagement with the friction iooA 22. A machine of the class described, in-

cluding a mainframe having-a table, sliding shoes, a'crank shaft connected with andv los reciprocating the shoes, a v'oo untei'shaft, pulleys mounted on the .crank shaft andthe countershaft, abeltconnecti'ng the said pulleys,- and a belt tighteningfdevice comprising a rock'shaft Vmounted in theffram o'f the machine and provided 'at one end withan clamp vthe said crank arm in its adjustment.

` .In testimony, that we claim the foregoing as our own lwe have hereto affixed our signatures in the presence of two witnesses..

JOSEPH o. PRiMs.. WILLIAM F. SMITH.

Witnesses: i l

SCHUYLER C. Bnan'r, l J.- F RANK COLGROVE'.'

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