[1]Patented May 11, 1954 29677,922 UN-ITED STATES PATENT OFFICE 2,677,922 FINISHING AND POLISMNG EQUIEPMENT George E. McGuire, Mflw,%ukee, Wis., assignor to J. M. Nash Company, Milwaukee, Wis., a corporation of Wisconsin AppReation August 10, 1950, Serial No. 178,577 16 Claims. (Cl. 51--139) 2 My invention relates to improvenients in finishing and polishing equipment and in certain respects is concerned with improveiiients upon the finishing and polishing -nachine shown and described in United States Letters Patent No. 2,322,459 issued June 22, 1943 to Carl J. Lippold. The inventio,@i relates to the abrasive finishing and polishing of contoured work pieces such as chair backs, and the machine for accomplishing this includes a constantly inoving belt-like abrasive elenient against which the work piece is presse d and fed by a feed roll. The improvements in my machine relate to: A novel working "head" over which the abrasive belt is directed at a work station; a novel 15 feed roll positioned and rotated to project the work piece in a path of rnovenient against the abrasi ve belt in a direction contrary to the direction of movement of the belt itself; a novel mount ing for a feed roll and for the cleaning of 20 the roll to assure pos'Ltive predetermined speed of work feed during a working operation; adjustable contour of the path of inovement of an abrasive belt through a working zone to accommodate work pieces of differing contour; novel friction '25 reduci ng means for a back-up shoe for an abrasive belt at a work station; novel nieans for cleaning a feed roll of an abrading or polishing machine; and means for mounting the power driving and driven elements of a machine of the 30 chara cter described herein so that .-he abrasive belt may be adj'ustably and controllably driven with respect to the ivorking head, and the feed roll nlay be adjustably operated to effectively feed a work piece contra to the direction of op- 35 eratio n of the belt. Furth er improvements will be apparent from the description below. ln the drawings: Fig. I is a side elevation of my finishing and 40 polishi ng machine. Fig. 2 is a plan view of the machine sh6wn in Fig. 1, portions of the hood over the abrasive belt and its operating niechanism and portions of the work table being broken away to show the 45 operat ing mechanism therebeneath. Mg. 3 is a plan view of the working head of the abrasive belt guiding means shown in Fig. 2, the scale of the view in Fig. 3 being somewhat enlarg ed. 50 Mg. 4 is a horizontal section of the woi-king head shown in Fig. 3 taken on line 4-4 of r, ig. 6. Fig. 5 is a horizontal section of the working head shown in Fig. 3 taken on line 5-5 of Fig. 6. Fig. 6 is a section on line 6-6 of Fig. 3 and 55 showing fragmentarily a portion of the feed roll which faces the abrasive belt. llig. 7 is a front elevat,,On of the guide rolls and their mounting in the viorking head of my machine. The guide shoe bein.a removed and portions of the shoe supporting Piounting being shown in vertical section. Fig. 8 is a fragmentary view iri plan showing the guide shoe and special friction reducing means incorpoi-ated with my guide shoe. Fig. 9 is a perspective of the guide shoe, the view being taken generally from the rear and showing the mountiy-ig bracket and the anti-friction web clamp used in conjunction with the shoe. Fig. 10 is a side elevatiol'i of the feed roll, feed i-oll cleoner, and power connections for the feed roll cleaner and feed roll, portions of the supporting members being broken away to show in vertical section the supporting nieans and certain of the assembled parts. Fig. 11 is a sectioii on line I 1-i I of Fig. 10. F-ig. 12 is a section on line 12-12 of Fig. 10, Fig. 13 is a side elevation of inain power and pulley drive assembly for the abrasive belt, certain portions of the supporting arms and the pulleys being shown in vertical section to show features of adjustment and power connection. Mg. 14 is a view taken on line 14-14 of Fig. 13. Fig. 15 is a vertical section on line 15-15 of Fig. 2. Fig. 16 is a section on line 16-1 6 of Fig. 2. Figs' 17 and 19 are PersPective views of particular shapes of work pieces for the finishing of which my machine is adapted. Fig. 19 is a vervical section through an alternative form of my invention. Fig' 20 is a side elevation of the machine shown in Fig. 19, the housing being broken away in vertical section to show the operating parts. Fig. 21 is a section on line 21-21 of Fig. 20. Fig. 22 is a perspective of a work piece for the finishing of which the machine of Figs. 19 and 20 is particularly adapted. Like parts are designated by the same reference @-haracters throughout the several views. As shown in Figs. 1 and 2, my fi-nishing and polishing machine includes certain principal structural portions which I shall preliniinarily designate and which will hereinafter be more specifically described. The entire machine is mounted upon a box-like enclosed frame or base 30. Upon the forward portion of this frame, at approximately table height, I provide the horizontal work table 3 1. Over the surface of this table a work piece such as one of the work pieces
[2]p 2,677,922 3 4 shown in Fig. 17 or 18 is guided and l@oreed by afeedrolIS2. Rearwardlyofthefeedroll,andto the right as sho\,vn in Figs. 1 and 2, is a working hcad,i,,id@icated.gener,@)llya,'.33. I@'routthiswo--,,king head is driven aii abras-1ve or po-'iishii-ig bol-t 34 5 which moves on a power pulley 337 mounted upoii a vertical axis under hood 36. At the rear portion of the machilie and mounted to the bac',T- portion of the frame thereof, is the motor 31 for the opcioation ol' the abrasive belt. Benealuh the worlz 1( table 3 1. are the motor and motor drive connections for the feed roll 32. F'or a ready understanding of the opei:ation o@l my machine, it should be iioted th,,,,t the abrasive belt Ze moves counterclockwise as shown in Fig. 2 and as indicated by the ayrow adjacent the workiiig head 33. However, the feed roll 32 rotates i-.i the dire@- tion indicated by the arrow iii l,'ig. 2 ar@d because the @Leed roll S2 has the characteristics below described, the work piece is 2G' forced horizontally through the ' hroat I i 6 between the feed roll and the abrasive belt in the direction contra to the direction of movement of the bE@'t 3e.. j--he worh piece showii in dotted lines at 3S in Fig. 2 is therefore in a position 25 which it assumes as it leaves the throat at the end of its travel through the throat. Belt drive As shown most clearly in Fig. 2 'uhe abrasive C) belt 34 is supported, guided ap-d poviered to move over the various pulleys and a shoe coinprisiiig working head 33 which faces forwardly towz,.rd. feed roll 32. At the rear end of the machine, the power pulley 35 is mounted upon a vertical qxis 5 40 provided by @@ixed shaft 41 carried by a heavy arm 42. This arm i-S swingably mounted upon hinge pintle 43 carried by a --Iami)-like frame member 4!, which forms a part of the frame arm 65 extending rearwardly of the box-like f--oame 30 of the machine. Upon one side of the fr,,lme arm 45 I mount a, set of ways 46 upon which motor is secured for sliding adjustment accord'iig to well knowli practices. Motor drive pulley 41 driving through multiple-bell@-S 48 is connected to 4,-, motivate 1,Dulley 49, and the pulley 49 is connected by belts 50 to the main drive pulley 35 upon which the abrasive belt 34 is supported, driven and guided. As shown in Fig. 13 the pulley 1.9 is mounted upon ball bearings on an eccentric, iiite,,ral extension 55 of the pintle 43 so that upon release of clamp bolts 5G and the rotation of pintle 49 by the application of a wrench to the scluared end 57 thereof shaft 55 may be eccentrically adjusted so as to chaiige the center distance between fixed shaft 41 and the extensioii 55 of pintle 43. The belts for the main di@ive pulley 35 may thus be adjusted, or relieved for belt change. Ball bearings 60 and 6 I at either end of the @i, power pwley 31. are self -aligning and provision is made at the top of tl-ie power pifiley for the wobble adjustment of bearing 61 so that the abrasive belt may be adjusted to ride at the proper level in its movement over the P(wer tj5 pulley and over the head 33. This wobble adjustment is accomplished by means of the !ever equipped shaft sleeve 62 mounted upon the Teduced end of fixed shaft 4 1, aiid it will be noted that this sleeve provides an ecceiitric mounting d@ i) for the cone of the bearing 61. Any position of rotative adjustment selected for the sleeve 62 upon sba@ft 41 may be fixed by set screw 63 as will be readily seen from the examination of Fig. 13. To adjust the tension 'Lipon the abrasive belt 75 (j 34 I provide a pneumatic belt tightener 65 which includes a cylinder 66 mounted upon a pivot mounting at 67 and provided with a ram 68 e,,,tending into contact wit-h arm 42 adjacent its support oii the fixed shaft 41. Air pressure upon the ram 68 thrusts the arm 42 swingably in a rearward direction to tighten the abrasive belt @' 4. The release of air from the cylinder 66 permits the ram 68 to retract within the cylinder and effects the loosening or slaeldng off of the belt 34. An air line and adjustable pressure regulator os showii in Mg. 2 may be used to select the desired tension of belt $4. No the for)@ard end of the belt 24 is working head 33 which is an important improvement in rny finishing aild polishing machine. This working head is suji .ported by a heavy channel cross member 70 braced from the box frame 30 by a head plate 71 which overlies the channel and provides a firm foundation for the working head (see Fig. 6). Top and bottom frame members 72 and 73, respectively, of the working head are substantially T-shaped in plan, and a vertical head fraine 74 extending between them is of relatively heavy I-beam construction as shown in Blig. 6. A set of ears 75 extending rearwardly .rom the T-shaped head frome 73 is bolted firmly to head plate 7 1. 'rhe cer@tral, forwardly extending legs 76 and -1"1 c)f thpT-shaled head frames 12 and 7,3 are spar@ned by a shoe raounting shaft 78, the lower end of which is shouldered and reduced in size to Prov@-de an -,nchor bolt 79 to extend through head plal@-e 71 and channel 70 to give additional stipport and fi-im anchorage to the worl,,ing head. 4- square thrust block 80 coniprises a collar positioned at a mid-point on shaft 78 between head frar,,ies 72 and 73 where it is positioned by set screws 8 1. Laterally through the shaft 78 and through this thrust blocl@. 80 is a shoe mounting pintle 82 which extends horizontally and is held in place by set screw 83. It is upon this horizontal pintle that the shoe 85 is mounted for slight adjustment as will now be described. Shoe 85 is a relatively narrow plate-like member sufficiently long in a vertical direction to provide a shoe surface for an abrasive belt of the greatest width to be used in my machine. I prefer to make this shoe of aluminum and I curve the front face, which is forwardly directed toward the feed roll 32, upon a relatively short radius taken on a vertical axis. The shoe is straight, however, in its vertical dimension, and is intended, once the machine is set up for a given abrasive or polishing belt operation, to be fixed in position, however, I momt this shoe 85 for adjustable oscillation about a horizontal axis provided by the shoe pintle $2. This pintle extends through the legs of a U-shaped bracket 86 secured at a mid-point in the back of the shoe as seen most clearly in Fig. 9. The legs of the bracket 86 are spaced apart surticiently to snugly embrace thrust block 80 on shaft 78, and the Jaracket arms are extended sufficiently rearwardly to permilu limited oscillation of the bracket and shoe upon pintle 82. -ihreaded holes through the upper and lower portions of shoe r@iouiiting shaft 78 provide for shoe adjusting screws 87 and 88 which adjustably bear against the bael, (>f the ' op and bottom of the shoe so as to control and @fix the position of oscillation of the shoe about the pintle 82. Upon the face of the shoe 85, I secure a pad col'isisting of a heavy layer of felt, sponge rubber or other cushioning material 90 which is re-
[3]i6ined ih position by a pad clamp 91 secured to the side of the shoe 85 by cap screws. As shown in Fig. 8 the pad is sewed or otherwise secured to a fabric backing 90'. Only this backing is crimped around the edge of the shoe and held under clamu 91. It will be seen in Fig. 8 that it is only necessary to secure this felt along one margin of the shoe since the pad is "wiped" into position over the face of the shoe by the action of the belt 34 as it moves across the working head. As will be apparent from the fo.Howing description the shoe 85 cushioned by a felt or sponge rubber pad is completely eff ective to avoid theirregularity and "jumpiness" of an abrasive belt moving through the working station of an abrading or polishing niachine. Such belts have lap joints and tend to jump when the belt joint passes over a pulley or other surface not made in accord with my invention, and each irregularity causes a blemish or visible defect in the polished or abraded surface of a work piece. Since I move my belt across a face of the shoe 85 with the felt 90 therebetween considerable friction which ,vould be tl:ius induced is avoided in my new working head by provision of my antifriction graphited fabric web 93 which is interleaved between the felt and the abrasive belt 34. The graphited material wwch I ha ' ve f ound best suited to this work is a light-weight canvas web, thoroughly impregnated with graphite. Along the sarne side of the shoe 85 to which the felt is gripped at 9 1, I mount a graphite web clamp 94 which is carried by brackets 95 and 96, and since the clamp 94 is eccentric in its mounting in said brackets, it is only necessary to partially turn the clamp 94 to securely hold the graphited canvas web in clamped position as shown in Figs. 2 to 5 inclusive. It is upon the surface of the graphited canvas web 93 that the belt 34 of abrasive or polishing material rides as it passes over the forward end of the working head. To make it easy to replace worn out graphited web material 93 I mount a reel or spool 930 on a spindle 931 secured to the box frame 30 as shown in Fig. 2. This spool has a ratchet wheel 932 fixed thereto, A fixed bracket 933 has a leaf spring 934 riveted thereto to act as a pawl def,,,ectable in one direction so that as the end of the pawl bears upon ratchet 932 a supply of web 93 on the spool may be unrolled and the pawl will act as a brake to prevent an unwanted excess of web from unrolling. I have found that an area of graphited canvas weo under an abrasive bellu will be effective for the life of an abrasive bellt, or approxirnately 3 or 4 hours of heavy duty work, and when the belt 34 is changed a new area of web 93 '@S drawn through the opened clamp 94. The worn portion of the web is then clipped off with knife or shears to prevent foulin- under the contour roll adjacent the trailing side of the shoe 85. Secured upon vertical shafts 91 and 98 fixed at either end of the T-frame 72, I provide pulleys 99 and 100 over which the abrasive belt passes ar).d is directed in going to and from the shoe 85. These two pulleys 99 and 100 and the shoe 85, therefor, define the extreme width of the contour of the belt 34 as it passes about my working head, However, it is necessary to make the curvature of the path of the belt 34 adjustably variable to conform to the requirements for finishing aand polishing work pieces having certain contours. I, therefore, provide adjustable contour rolls 10 5 and I 06 which are carried on swingable vertical contour roll shafts 101 and 108, rospectively. These contour roll shafts are carried in turn by anti-friction bearings at the end of swingable brackets 109 and 110 each provided with a pair of bracket bosses I I I and i I I' bored for reception upon shoe mounting shaft 73. Each of the brackets 109 and I 10 has two spaced pads 112 against ivhich contour roll adjusting screws 113 and 114 may be brought to 10 bear as they are threadedly adjusted in bosses 116formingpartofverticalheadframe74. Thus although the extreme width of the path of travel of belt 34 about head 33 is determined by the pulleys 99 and I 00 and the vertical center of the shoe 15 85 determines the extreme forward portion of the working face of the belt in the course of its travel, the actual contour of the working face of the belt between the pulleys 98 aand 100 is determined by the adjustment of the contour 20 rolls 105 and 106. As (lescribed above the shoe and its resilient pad 90 with the .- raphited canvas cover thereover can yield aloiig its lateral areas and since the belt 34 is under tension controlled by air pressure in cylinder 66, the ad25 justrient of the contour rolls 105, (OG can alter the contour of travel of the belt 34 bebween the pulleys 99 and 100 and the shoe 85, and can also influence the contotir of the path of travel ol the belt over the surface of the shoe. The head 33, 30 therefore, offers adjustmenls of contour iii a versatile way under control of the contour roll adjusting screws It 2-1 14. in fact the extreme of movement of the swingable adjustment of the contour rolls on their brackets 109, i89 permits 35 of their retraction sufficiently to take them out of contact with the belt whereby to permit the belt to be guided and contoured orily by the pulleys 99 and 100 and by shoe 85. Adjustment of the shoe 85 about pintle 82 un40 der control of the shoe adjusting screws 87 and 88 makes it possible for the operator to incline the shoe with reference to the face of the feed roll which faces it. Feed Roll 45 Forwardly of the shoe 85 and mounted upon a power operated feed roll shpft 115 there is mounted a generally pulleyshaped feed roll 32, the snrface of which, in general, is parallel 60 v@rith tl-le shoe 85. The surface material of this feed roll is of great importance in the operation of my machine and the operation of the feed roll at controlled speed appears to be important not only with reference to the speed with which a ,5 work piece is to proceed through a polishing or abrading operation, but also with reference to the successful thrust of a worl, piece through my machine contra to the direction of operation of the belt 34. 30 Feed roll 3,2 is built up so that the surface comprises alternate lands 321 of rib-like resilient material and lands 322 of noi-i-resi-'Lient material, such as wood or metal, the resilieiit lands project outwardly, radially beyond the non-re(5 silient lands sc> that peripherally '@,he feed roll presents against the surface of a work piece oiily the somewhat annular ribs of resilientmaterial. I have found that in a feed roll six inches in 70 diameter and nine inches long in its vertical dimension a practical feed roll for feeding wooden work pieces, such as those shown in Figs. 17 alid 18, includes alternate resilient lands ylz;- inch wide and interspersed spacers 322 1/4 inch wide. 7# Thus far in the experimental and commercial
[4]7 use of my machine I have found that natural rubber provides the best feed roll rib surface with which to feed wood, plastic, and other materials of which furniture and like items ar-made. But within contemplation of my invention, it will be apparent that other substances of a resilient nature such as synthetic rubber may be used to provide the resilient laiids or ribs required for the feeding of work pieces of differing characteristics. The ribs of my new feed roll are laterally as well as radially yieldable to conform to the irregularities of surface areas of work pieces. Thus there is opportunity for the ribs to yield and to shape fhemselves against the work piece surface with a better feeding action. As indicated above the feed roll mounted upon its shaft i i 5 opposite shoe 85 and the shaft I i 5, is adjustablilt swingably carried by mechanism now to be desc,.,ibed, so that the worl,,ing t@iroat indicated as I i 6 be,@we.-n the feed roll and t'.Iie shoe 85 may be adjustably opened and closed in accord with th.- requirement for space through which a work piece ,;uch @; s the work piece shown at dotted lines in Pig. 2 may be fed. Beneath the table 31 ap-d attached to the boxlike frame 30 are a pair of feed roll frame supports II 7 and I IS which converge as shown i,-i Fig. 2 to provide a stable mount-irlg for feed reld assembly pintle 11 9. Upon this pintle is mounted swingably a heavy feed roll assembly ari-ii 12-lu shown most clearly in Figs. 2 and '10. kt the outer end of the arm, the opposite end from the pintle i I 9, is mounted the vertical shaft i I 5 which is carried in a ball b-.aring in a tubular support 121 so that the feed roll mounted on the upper end of the shaft extends upwardly froni the arm 120. Below the arm 120 and carried by a sleeve 122 held in tube 121 by set screws 123 is a speed reducer i 2 4. A pin and slot connection at 125 provides for ready assembly and connection of the output shaft of the speed reducer with shaft II 5 upon which feed roll 3 2 is mounted. A pulley 12C provides the input connection for the speed reducer 124, and this pulley is connected by V-belt 127 with a pulley 128. The pulley 12 8 is mounled directly on the niotor shaft 129 of motor 130 @vhich provides tiie motivation of feed roll 32. The pulley 128 is of controuable working diameter wilh respect to V-belt 127 for speed change in a r@,ianner well known in the V-belt art and is popularly known as an Ideal pulley. Motor 130 is supported frorn arm 120 by motor support shaft 131 on the lower end of which is a motor mounting pad 132 supported for free rotation on the shaft 13i by collar 133 Nvhich constitutes a, non-rot,,,Ltable thrust collar at the end of Ithe shaft. (See Fig. 10.) The motor mounting pad has an arm 134 extended from it radially of the axis of shaft 131 and a k@crew threaded speed adjusting manual confrol 135 is .,o positioned that the end of its screw bears against a foot 136 forming an integral part of the collar 133. Thus +.he motor may adjustably be swulig bodily about the axis of shaft 131 to "tigh't,en" or "loosen" the belt 127, the real result of such adjuztraent being a change of speed of inpiit p,,illey 126 and chan.-e of speed of rototior of the feed roll. 3 2. As will now be apparent, the feed roll is carried on the swingable end of arm 120 and it may move toward and awoy from the shoe 85 in a slot 140 in table 3 1. Since the feed roll is biased 2,077,022 8 vention, I provide a bias arm 141 extending horizontally from the upper portion of the arm 120 and at an angle thereto as shown in Fig. 2. To the outstretched end of this biasing arm 141 1 attach biasing spring 142 which is under tension adjtistably determined by manual bias control device 143 with its handle 144. This device is identical in construction with manual stop control 145 with its handle 146, detailed con10 struction of which is seen in Fig. 16. This stop control 145 has chain connection 147 to a boss 148 on the tubular support 121 so that the swing of arm 126 and the feed roll 32 is limited, at least sufficien'@ly to prevent contact of feed roll 15 32 with belt 34. The operator also may use this stop control to deterniine the depth of "cut" when an abrading or sanding belt is being used. Construction of the manual control devices 143 and 145 will be apparent from an examination of 20 P. ig. 16 where it ;,rill be s,.en that a f' anged tubular housing 150 is secured by machine screws 151 to the front of box frame 30 into Nvhich the tubular portion of the device extends. A reciprocable, non-rotatable nut 152 is threaded in25 ternally to receive control screw 153 forming part of the handle 146, the screw being flanged at 154 to prevent reciprocation of the screw in the tube 152. Aily form of key 155 may be used to plevent rotation of nut 152. Thus upon rota30 tion of handie 146 the nut is reciprocated and 'uhe member fasteiied to it, as for instance chain IP-7, is pulled or relieved to the extent dictated by the relative tl-ireaded adjustment of nut 152 and screw 153. 35 It will be noted that because of the angular disposition of bias arm 141 with reference to the point of anchorage of spring 142 the bias of .1eed roll 32 toward the working head is substantially constant throughout the working range of 40 swinging movement of the arm 120 and bias arm 141 a-bout the pintle II 9. Even though the spring is more greatly extended the pressure remains approximately tie same since the moment arm is shortened in the more extreme position of bias 45 arm 14 1. Maintenance of proper frictional contact of the drive roll 32 against a work piece 38 is important in order to assure driving force to move the work piece contra to the direction of movement 50 of belt 34, 'rhe rubber-like resilient ribs of the feed roll 32 inust, therefore, be clean and I have found ordinary cleaning devices unequal to the requirements especially in view of the fact that the atmosphere adjacent the roll 32 and the work55 ing head is laden with dust resulting from the abrading or polishing work. My invention, therefore, includes a cleaner mechanism the principal working element for which is a cleaner roll 155 mounted upon @i cleaner roll shaft 156 carried 60 iotelably in a closed ball bearing assembly 157. This asseinbly is in turn carried by a swingable I cleaner arm 158, the shape of which is shown most clearly ; Fig. 11. A cleaner bracket 159 @n - extending out frol-,i arw- 120 supports a pin 160 65 about which the clealler arm may swing, and a thumb screw at I 6 I with a spring bearing against the cleaner arm detern-lines the position of the cleaner roll with ref erence to the f eed roll. Multiple belts iG2 apply rotative force for the rota7( tion of the cleaner roll which spins quite rapidly as will be apparent from the relative size of the "pulley" on the cleaner roll as contrasted with the pulley on the feed roll (see Fig. 10). The surface of the cleaner roll is a Pile fabric toward the workllead 33 in accord with my in- 7r) and a rug-like material is best suited to the work.
[5]9 I have found that the bristly Pile of rug fabric will keep the ribs clean and no feed failure results from slippage between the ribs and the work piece wliile the cleaner roll 155 is in operation, Work tabte adjustme?,tt 6 The belt 34 is usually much wider than the work pieces be@iig fed thi@ough the throat II 6, and the ionstart conceiitration of work upon the lower portions of the belt would soon destroy it 10 eithet by wear or by stretching that portion of the belt. I therefore, motint the work table 31 upon screw jacks 170 as shown clearly in Fig. 15. Of course some work pieces, in the hands of a skilled operator can be fed through the throat without 15 help fro-,r the table and may be directed into the throat at any lever thereabove, but heavy pieces are usually fed with one edge against the table. At two spaced points upon the channel cross member 70 I provide t-Libi-'ar mounting reinforce- 20 ments 171 each of ivhich is shaped to receive mounting sleeves 172, at the lower end of which is a braeket 173. 'nie i,,iterior of the sleeve 172 is shaped to slidably receive a post 174 which is actuall5r an. inteyiorly thref),ded nut mounted non- 25 rotatably as a sliding element for the support of table 31. The screw 175 of this screw jack construction is carried by the bracket 173 in ball bearings as shown at 176 and the screw is provided at its lower end with a miter gear 177. 30 Each of the brackets 173 has a depending crossshaft supporting bearing at 178 for cross-shaft 179 upon which are mounted miter pinions 180. Cross shaft 179 extends through the side wall of the box frame 30 and is Provided with a hand 35 crank 181 so that when the cross shaft 179 is rotated thereby the screws 175 within each screw jac'@c assembly may cause the work table 31 to be raised or lo@,vf-,red as desired. In order to distribute the wear and secure the 40 greatest advantages of the full width of the belt 34 1 use the work table adjusting mechanism above described so that, from time to time, the work Dieces may be applied against an upper portion of the belt or at a rpid-point rather than a_s@ainst the lower portions of the belt which might otherwise be constat-itly used. For dust disposal I use the interior of the hood as a part of the dust disposal system. The hood 36 terminpt@ing forwardly at 185 (see Fig. 2) 'cartially encloses the working head so that dust lade,n 54.ir ad@'?acent the working head is drawn into the space beneath the hood. I-Ioweirer, if dusty air passes beyond the opening through 105, it is dissemina.ted in the direction in which the belt r@ carries it, Pnd I, the,.efore. provide an air funnel @@96 beside the hoofi, 136. Tt is to this hood construction 186 thst I attach a conduit at 187 to ,,@)ithdravr the oir from the hood and the box frame. A Darticulgr point where dusty material (;o must be withdrawn is the zone about the pile fp.bric slirface of the cleaner roll 165, therefore, ,it a convenient point in the periphery of this roll I provide a pick-ut) nozzle ISO and this nozzle is -.onnected with the interior of the box frame 30 C@ ,-i so that dust picked off of the Pile fabric of the roll 155 is dra@,,,,n into the box frame 30 and then moved froria the box frame through the conduit 167. Alternative construction 'o As s'-,iown in M@,s. 19 and 20 some of the features of iry invention have been incorporated in what rai.-ht be termed a vertical machine. This is best suited to the tyi),e of work piece shown in r,lig. 22 in ivl-iieh the grain of the surface of the 2,677,922 10 wood runs in the direction indicated In the drawings. Such a work piece presents special problems because of the large dimensions in which such work pieces often are fabricated, for instance in ply-wood for chair baclo or chair seats. The vertical machine shown in these Figs. 19 and 20 is constructed with a box frame 200 having a fixed tablelike top 201 apertured somewhat rearwardly of the center portion at 202 for the receptioii of a vertical column 203 flanged at 204 ai-id secured to the table top in the position shown in Figs. 19 and 20 where it is braced by a bar strut 205 welded to the tube 203 and extending to the bot'om 206 of the box frame with which it is in welded construction. A second bar strut 207 likewise welded to the lower portion of the tube 2 tl3 exteiids dow?-iwirdly from the tube sufficiently to provide a bearing support for lower pulley shaft 108. T-1-iis pulley shaft extends through a bearing 'in strut 205 and is pro@lided with motor driven pulleys 209 motivated by irotor 2 10 and belts 21 1. Upon thi,- shaft 208 is the lower pulley 212 for abrasive belt 213, which extends upwardly through the table 201 at spaced points 214 and 215 and is supported over 'Lipper belt pulley 216 carried by a heavy bracket 217 welded to the top of tube 203. Pulley 2(6 is directly supp<)rted from the bracket 217 upon upper pulley arm 218 pivoted to bracket 217 at 219. An air cylinder and ram assembly 229 comparable to the air cylinder and ram assembly 65 supports the pulley arm 2 1 8 so as to maiiitain proper tension upon the belt 213. Mounted on the front face of the column 203 is a bracket 225 carrying horizontal shoe pivot 226 upon which is mounted shoe 227 comparable to shoe 85. 13racing screws 228 anf-q 229 provide for adjustment and fixing of the position of the shoe 227 in oscillatory adjustment of the shoe about the pivot at 226. In this construction the motor 210 drives the belt 213 with the front flight 230 moving in a dowiiward direction as indicated by the arrow and it passes over the shoe 227 from a leading edge at 231 to the trailing edge 232 of the shoe which is equipped -,vith a felt pad 233 and a graphited canvas aa-iti-friction element 234 comparable to the web 93. T-his web extends 'Lrom the lower or troiling end of the shoe 227 at 232 over the shoe siirface and upwardly over a clamp 235 comparable to clamp 94 and over suitable piilley 236 to a drum 237 where a supply of this web in coiled condition is stored in readiness for use. The feed roll 240 of this vertical machine is constructed in laminations and ribs comparable to the feed roll 32, but it has consider,,,ble vertical ext(@nt sufficient to be juxtaposed to the large shoe 227 shown in Figs. 19 and 20. It has a cleaner 241. comparable to cleaner 153 which is likewise provided with a pick-up nozzle 242 for dust to be passed throiigh a conduit 243 and evacuated througb conduit 244. Thus the vertical machine shovin in Mgs. 19 and 20 provides a working throat 250 into which a work piece may be inserted so that in one "pass" the belt 213 may polish or abrade the surface of 9, large work piece with complicated contours, but in this vertical r@,iachine the feed roll feeds the work piece transversely of the path of movement of the belt 2 i S. The mounting of the feed roll 240 upon its vertical shaft 255 is comparable to the mounting of the feed roll 32 in that a bracket 256 extends outwardly from the box frame 200 and a pintle 257 carried by the bracket 256 is used to support
[6]a feed roll arm 258. Bias to hold the feed roll and the feed roll arm 258 in a rearward direction and to press the feed roll against the work piece in the tl-iroat 250, is derived from a bias arm 259 and spring 260, comparable to the biasing means at 141, (42 as shown in Fig. 2. Stop connections coiiiparable to those shown at 145-147 and 148 are connected at 261 and a power drive for the feed roll shown in general at 265 in Fig. 19 is comparable to the drive shown in Fig. 10 as will be readily seen upon exarnination of Fig. 19. In preparation of my machine for operation a belt 34 of the desired characteristics 'Lo@- polishing, abrading or f nishing is applied to the main power pulley 35 and is applied to the power head by placing it over pulleys 9 9 and I 00, and the shoe 05 therebetween. At the same time that the belt is placed over the shoe and its pad 90, the web of graphited fabric 9 3 is inserted between the belt 34 and the pad. The contour rolls iB5 and 106 are then adjusted by the use of the contour roll adjusting screws ( i 3 and i 14 so as to urge these rolls outwardly at-,air!,st the belt sufficiently to contour the path of t@,avel of the belt to suit the requireme.ut-s of the curvature of the particular work pi,-ce which is to be worked upon. If the work piece is sharply curved, '.-he contour of the path of travel of the belt 34 over the shoe 85 miist be upon a relatively small radius and 'uhe contour rolls 105 and 106 will only bear lightly i.f at all upon the inside of the belt. Under quch circumstances the tension upon the belt induced by air pressure in the pneumatic belt tightener GO will cause the laterea margins of the pad on sho-, 85 to be compressed and thus reduce the radius of curvature of the belt at the point where it passes over the shoe. The motor 37 may then be started and the belt 34 will continuously operate in the d-irection indicated by the arrow. If the belt tends to creep up or down on the shoe, the main drive pulley 35 may be adjusted on its wobble adjustment but pulleys 99 and too and the main drive pulley 35 are crowned, as shown clearly in the drawings so that the belt will tend to ride in proper position over them. If it is desired that a greater area of the belt ,N4 at the working head 33 be applied to the work piece, the contour rolls 105 and 106 may be adjusted outwardly against the bellt, and when the belt is thiis contouied the pressure upon the lateral marg;@ns of the shoe and its pad is relieved. if the work piece to be i@iorked -,ipon is narrow, the table 21 may be u,@,ed to adjust the table to the proper height to apply the work piece against the upper, -niddle or lower portion of the belt 34. The throat (i6 between the feed roll 32 and the a7orking fa,ce of belt 34 is then adjusted to suit the particular thickne@,,s of work piece 38 ,,vhich is to be l@ed therethrough. 'niis adjustment is ivade manually by means of the handle 146 Njblch may be used to pull upon or release chain 147. At the same time the bias of feed roll 32 toward the N@7orking head 33 ma@7 be adjusted manually by rotating handle 144 for change of tension of spring 142. When motor 130 is started feed ro'Ll 32 will be rotated at the part@'-cul.ar speed selected by the adjustment of the Ideal pulley (28. The direction of rotation of roll 32 is indicated by the arro,,v of Fig. 2 and the work piece is fed into the throat I IO as determined by the rotation of the direction of the feed roll, this being contra to the directioii of travel of the belt 34. Because the ribs of rubber engage the side of the work piece opposite that which is to be abraded or polished 2,677,922 12 by the belt 34, the work piece is thrust through the throat progressively and finally takes a position shown at 38 in Fig. 2 when it is delivered from the throat 116. 5 Since the shape of the throat is dictated by the straight vertical surface of the feed roll and the straight surface of the shoe 85, the respective side surfaces of the work piece which has been worked upon by my machine are parallel or substantially 1() parallel according to the adjustment of the shoe 85 under control of the shoe adjusting screws 87 and 88. The experienced operator of -rny machine will readily determine the bias of feed roll 32 toward 15 the work and will determine the depth of the "cut" by means of the stop chain (41 if the purpose of the operation -is to abrade or sand the work piece. I
