US1421205A - Work holding and feeding device for grinding or polishing machines - Google Patents

Description

R. W. FULLER.\ WORK HOLDING AND FEEDING DEVICE FOR GHINDING 0R POLISHINGMACHINES.

APPLICATION FILED JUNE I4. |920. 1,421,205. Patented June 27, 1922.

4 SHEETS-SHEET I.

R. W. FULLER. WORK HOLDING AND FEEDING DEVICE FOR GRINDING 0R POLISHING MACHINES.

APPLICATION FILED JUNE 14. 1920.

Patnbed June 27, 1922.

4 SHEETS-SHEET 2.

H. W. FULLER. woRK HoLDmG AND femme DEVICE Foa Gmnm oa Pousmm; MACHINES. APPLICATION FILZD JUNE I4. |920. 1,421,205, Patented June 27, 1922.

4 SHEETS-SHEET 3.

V w A m $983 f5 gli;

Inv/cra?" R. W. FULLER. WDRK HLDING AND FEEDING DEVICE FDH GRINDING 0H POLISHING MACHINES. APPLICATION FILED JUNE I4. |920.

M mi, w. mm-- centres.

UNITED STATES PATENT OFFICE.

MACHINE COMPANY, 0F GREENFIELD, MASSACHUSETTS, A CORPORATION MASSACHUSETTS. i

WORK HOLDING AND FEEDING DEVICE FOR GBINDING OR POLISHING MACHINES.

Specification of Letters Patent.

Patented June 27, 1922.

Application led June 14, 1920. Serial No. 388,742.

To all whom it may concern Be it known that I, RUFUs W. FULLER, a citizen of the United States, residing at Deerfield, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Work Holding and Feeding Devices for Grinding or Polishing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, su'ch as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to machines for grinding or polishing articles of cylindrical form, and more particularly to work holding and feeding devices for such machines.

The invention is especially adapted for use in connection with machines of the type known as centi'eless grinding and polishing machines in which the work is sup orted upon its peripheral surface instead o upon As commonly constructed, machines of this particular type are provided with an abrasive Wheel or belt, and with a work support for holding the article to be operated upon with its cylindrical surface engaging the abrasive element. The abrasive element is driven at Aa relatively high speed to grind or olish the work which rotates at a relative y low speed While it is bein ground or polished. Provision is common y made for automatically feeding the work in a longitudinal direction as it 1s being rotated so that its surface will be operated upon throughout its entire length.

One object of the invention .is to provide certain improvements in machines of the above named general character tending to render them eiicient in operation and capable of being quickly and accurately adjusted to operate upon different articles.

With these and other objects 'in view as will be apparent from the followin specilication, the invention resides in the eatures of construction and combinations of parts hereinafter described and articularly pointed out in the appended c aims, the advantages of which will apparent to those skilled in the art.

In the drawings, Figure 1 is aV view, Vin side elevation, of the lower portion of a polishing and finishing machine of the .abrasive type equipped with a work holding and ferred form; Fig. 2 is a' view, in front elevation and on an enlarged scale, of the work holding and feeding Fig. 3 is a detail a modified form of work rest; Fig. 4 is a detail View, partly in section, showing a portion of the drivin mechanism for' the 'vvork feeding element ilustrated in Fig. 1; Fig. 5 is a section on the line 5 5 of Fig. 2; Fig. 6 is a detail sectional view, on an enlarged scale, showin the relation of the work to the work holding and feeding elements; Fig. 7 is a detail sectional view taken on the line 7-7 of Fig. 5; Figs. 8 and 9 are views, in side and front elevations, respectively, showing a modified form of work holding and feeding device; and Fig. 10 is a detail per ective view showing the means for adjustab y supporting the device shown in Figs. 8 and 9.

The machine selected for illustrative purposes is an example of a grinding or polishing machine of a well-known type in which the grindin or olishing element consists of an en ess abrasive belt. As shown in Fig. 1 of the drawings, the abrasive belt 10 passes over a backing or cushioning belt 11 while the latter in turn asses over a pair of pulleys 12 and 13 whic device shown in Fig.,1;

which is fast upon a main shaft., 15 that is journaled in bearings in the lower ortion ofthe standard 14. The main sha .15 is perspective view showing are' arranfged one above the other at one side adapted to be connected with any suitable source of power"-whereby it may rotated continuously during the operationr ofthe machine, at a high rateof speed and in a direction to cause the front stretches of each of the belts 10 and 11 totiavelA downwardly. The pulleys 12 and 13 and the third pulley (not shown) at the top of the machine are all arranged to rotate in the saine vertical plane, and thefront stretches of the abrasive an`d backing belts travel in the same direction and in contact with one another.

The work, which is indicated at W, is positioned horizontally, with a portion of its cylindrical surface in contact with the downwardl moving abrasive belt 10, and 1s supported y means of the improved work holding and feeding device embodyin the present invention. As best shown in igs. 5 and 6, the work holding and feeding eviee comprises essentially a work rest 17, which enga es the under side of the work, and an` end ess belt 18 which engages the side of the work along a line diametrically opposite the line of contact between the work and the abrasive belt. The belt 18, which may conveniently be made of leather, trav els in the op osite direction from the abrasive belt andp at a much slower speed, and operates to turn the work slowly while it is being operated upon by the abrasive element. The belt 18 passes over rollers which are so mounted that the belt may be inclined 'relativel to the work in a lane parallel to the vertical axial plane of t e work so as to feed the work in a longitudinal direction throughout the grinding or polishing operation in order that the entire surface of the work shall be brought into contact with thc abrasive belt. Y A

The work rest 17 (Figs and 6) coinprises a strip of fibre or other suitable material which will not mar the polished surface of the work as the latter is rotated over the work rest. The Work rest is supportedv in a-vertical plane and extends horizontally in front of the abrasive belt so as to present its upper edge to the cylindrical surface 0f the work and to support the work substantially midway As best shown in Fig. 6, the work rest 17 is arran d to engage the work along a line exten ing across its c lindricalsurface between the central vertical plane thereof and the line of contact with the abrasive belt, in order to prevent the work from being wedged between said belt and the work rest and to lessenthe tendency ofthe rapidly travelling abrasive belt to rotate the work instead of polishing it. The work rest 17,

being preferably constructed of fibre or similar material, is backed or reinforced by` a metallic strip 19, the fibre and metallic strips being arranged edge to edge, as shown in Fig. 6, and connected toge'ther by a tongue and groove joint. In order to adapt the work rest to properly support pieces of work of various sizes, the work rest is mounted with provision for adjustment both vertically and toward and from'the Vabrasive belt,

as will be hereinafter explained.

The belt 18, which will hereinafter be termed the feed belt, passes over a pair of flanged rollers 2O and 21 of equal size which are rotatably supported in a housing"22 that partially encloses the feed belt. Thehousing 22 is carried by a bracket 23, rising from a shelf or table 24 which extends across the between the pulleys 12and 13.

`and is removably secured-to the body portion 28 by means of bolts 30. The lower feed belt roller, 21V is keyed to a shaft 32, which is journaled in the opposite side walls of the housing 22 and is driven, as will hereinafter appear, so as to cause the feed belt to travel at a relatively low rate of speed and in a direction opposite to the direction of travel of the abrasive belt in order to slowly rotate the 'Work durin the grinding or polishing operation. roller 20 is journaled upon a rod 33, the o posite ends of which extend through vertical slots 34 (Figs. 1 and 2) severally formed in bosses 35 in the cover late 29 and opposite side wall 28 of the ousng. 'l'he ends of the rod 33 may be provided with liattened side, faces 36 to engage the vertical side walls of the slots 34 to prevent the rods from turning. The rod 33 may be adjusted in the slots 34 to vary the tension of the feed belt by means of adjusting screws 37 which extend through the bosses 35,'the inner ends of the adjusting screws engaging attened faces 38 on the under side of the rod. Suitable lock-nuts 39 are provided for securing the screws 37 in their adjusted positions.

To supportthe work laterally against the thrust of the abrasive belt a platen 40 is formed on the cover late 29 which provides a backing for the eed belt.

To ada t the machine to o rate on cylindrical articles of diilerent diameters, provision is made for adjusting the feed belt bodily toward and from the abrasive belt. To this end the bracket 23 is provided at its base with a pair of parallel horizontal ribs or tongues 44 (Fig. 2) which are mounted for forward and rearward sliding adjustment in V-shaped ways 45 Yformed 'in a pair of ribs 46 which are'boltedto the table 24, the ribs 44 being shaped, as shown in said fi re, to lit within the ways. Adjustment o the bracket 23 in the wa s 45 is effected by means of a right-hand adjusting screw 47, which is threaded through a projection 48 depending from the bracket 23, and is,rota tably supported in a pair of bearing lugs 49 on the table 24. A hand-wheel 5() is secured to the ,front end of the adjusting screw 47 by means of which the latter may be turned to adjustthe feed belt horizonVY tally.

In addition to rotating the work, the feed belt feeds the work longitudinally while it e upper feed beltis being rotated. The longitudinal feeding of the work is effected by causing the fee belt to travel obliquely across the cylindrical surface of the work. To this end the housing 22 which carries the feedbelt is pivotally mounted upon the bracket 23 to permit lateral tilting adjustment of the housing, together with the rollers 20 and 21 and the feed belt 18. As shown in Fig. 5, a pivot stud 52 which is secured to the front side of the feed belt housing projects forwardly therefrom through the bracket 23 and throu h a sleeve 53. The pivot stud 52 extends eyond the sleeve 53 and is surrounded by a coiled spring 54, one end of which bears against a washer ad`acent the outer end of the sleeve 53, while tlie opposite end thereof bears against a nut 55 that is threaded onto the forward extremity of the stud 52. The force of the spring draws the housing 22 toward the bracket 23 holding a bearing, face 56 on the front of the housing in engagement witha corresponding bearing face 57 on the rear side of the bracket 23. The feed belt housing is rigidly but adjustably secured to the bracket 23 by means of a binding screw 58, which projects through a slot 59 that is formed in the bracket 23 above the bearing face 56, the screw being threaded into the front wall of the feed belt housing.

In order to permit the feed belt housing to be tilted about the axis of the pivot stud 52, the slot 59 is of arcuate form, as shown in Fig. 2, its center of curvature being coincident with the axis 0`f the pivot stud. Consequently, by loosening the binding screw 58, the housing 22 may be tilted so that the feed belt will extend obliquely across the work and thus operate, when driven, to feed the Work in a longitudinal direction, as it also rotates the work. The rate of longitudinal feed of the work across the abrasive belt may be regulated by tilting the feed belt housing to adjust the an le of inclination of the feed belt. By regu ating the speed of the feed movement 1n this manner, the work may be subjected to a greater or less amount of grinding or polishing. It is obvious that the direction in which the feed belt is tilted will determine the direction of feed of the work and that by adjusting the inclination of the feed vbelt accordingly the work may be fed through the machine from right to left or from. left to right as may be desired. When the binding screw 58 has been tightened, the feed belt housing is rigidly secured in adjusted posibtion. To assist in obtaining the required degrec of( angular or tilting adjustment of the feed belt, a pointer 61 isprovided at the top ofthe bracket 23 which is adapted to register .with the graduations of a scale 62 that is formed on the front wall of the feed belt housing.

By reason of the above described provisionsfor the adjustment of the feed belt both horizontally and angularly, it is neces? sary to provide driving mechanism for the feed belt which will permit such adjustment without interfering with the driving connections. To this end the mechanism for driving the feed belt comprises the parts which will now be described. As shown Vin `Figs. 1 and 2, the lower feed belt roller 21 is driven through a train of aring comprising a pinion 64 that is fixe to the shaft 32 which carries said roller, han idle gear wheel 65 that is pivotally mounted upon the housing 22, and' a pinion 66 which is fixed to a stud shaft 67 that is journaled in bearings 68 on the front wall of the housing. Secured to the stud shaft 67, as shown 1n Fig. 2, is a bevel gear 70 which meshes with an idler bevel gear 60, the latter being mounted on thesleeve 53 which surrounds the pivot stud 52. The idler gear 60, in turn, meshes with a bevel gear 71 which is secured to ashaft 72 and is journaled in bearings' 73 carried bya bracket 74 which is bolted to the side of the bracket 23. Another bevel gear 75, which is secured to the shaft 72, meshes `with a bevel gear 76 which is secured to the upper end of an inclined shaft 77, the latter being rotatably supported in a bearing 78 carried b a yoke 79 which is swiveled upon the sha 72. Splined to the lower end of the inclined shaft 77, as best shown in Fig. 4, is a worm wheel 80 which is driven by a Worm 81 that is keyed to the main shaft l5. The worm wheel 80 and worm 81 are enclosed in a casing 82 that is swiveled on the main shaft and provided with bearings 83 in which the inclined shaft 77 is journaled and adapted to slide longitudinally. As the feed belt is adjusted horizontally toward or from the abrasive belt, the inclined shaft 77 will slide relatively to the worm wheel 80 While the necessar changes in the angular position of the sha t will be permitted b the swiveled bearings 83 and the swivele yoke 79. As the feed belt housing is tilted to adjust the inclination of the feed belt, theAbevel gear 7() will roll over the idle bevel gear 53 wthoutinterfering with thedriving connections.

As the feed belt is adjusted toward or from the abrasive belt to accommodate different sized pieces of work, it becomes nec- 'essary to raise or lower the work rest 17 in` order that the work may be supported at substantially the same elevation irrespective of its size. It is also necessary to adjust the workrest horizontally toward orfrom the feed belt to adapt it to properly support different sized pieces of work. In the res` ent machine the vertical and' horizonta adjustments of the work rest are effected concurrentl with each other and simultaneously wlth the horizontal adjustment of the feed belt, the degree of adjustment 'of the ing,

work rest being determined by the degree of adjustment of the feed belt. To accomplish this result, the work rest is carried by a work rest supporting frame 84, whichjs adjustably mounted in a bracket 85, of an angular shape best shown in Fig. 5, the bracket having a horizontal web 86 which is bolted to the under side of the table 24 and a downwardly inclined portion 87 which carries the work rest supporting frame 84. As best shown in Fig. 2, the work rest sup orting frame 84 comprises a pair of oppositely dlsposed upwardly extending arms 88 to the upper'ends of which the work rest is secured, the fibre portion of the work rest being secured at its opposite ends to said arms by means of screws 89 while the reinforcingplate 19 is secured to said arms by screws 90. Below the feed belt roller 21, the arms 88 converge toward each other and terminate in a pair of parallel ribs 92 the lower portions of which are inclinedrelatively to the upper portions and are connected by means of a cross web 93. Theribs 92 are adapted to slide in ways formed in a pair of ribs 94y which are secured to the inclined portion 87 of the bracket 85. Concurrent vertical and horizontal adjustment of the work rest is effected by means of a left-hand adjusting screw 95 (Figs. 5 and 7) which is threaded through the cross web 93 of the supporting frame 85 and is adapted to turn without longitudinal movement in a bearing 96 formed in the bracket 86. In order that the adjusting screw 95 may be actuated to adjust the work concurrently with the adjustment of the feed beltl housthe adjusting screw 95 has secured to its upper end a bevel pinion 97 which meshes with a bevel pinion 98 that is secured to the rear end of the adjusting screw 47. Thus by turning the hand wheel 50 to adjust the feed belt housing horizontally, the work support 17 will be adjusted concurrently therewith, bothv vertically and horizontally. Preferably the relative pitches of the two screws 47 and 95 will be such that the axis of the work will be maintained in the same horizontal plane irrespective of the diameter of the work. The angle of inclination of the ways in the bracket 8,5 is such that the work rest will be positioned to engage a corresponding part of the cylindrical surace of the work irrespective of the size of he work for which the adjustment is made. In operating upon articles of brass it has been found that small particles of the metal removed bythe abrasive belt become embedded in the fibre Work rest and tend to mar the polished surface of the work as the work rotates overthe work rest. Consequently it has-been found advisable, ,when operatingm on articles of brass or other soft materia to employ a modified form of work rest, suchas that illustrated in Fig. 3.

As shown in this figure, the modified work rest comprises a plate 1'00 which is carried by the work rest supporting frame 85, and is provided with a pair of upstanding bearing lugs 101' (one only being shown) in which are journaled trunnions 102 of a small roller 103 which is adapted to engage and support the work. The small particles of metal removed by the grinding or polishing operation will not be retained upon the surface of the roller 103, and consequently will not interfere with the polishing operation.

In order that the abrasive belt 10 may be uniformly held against the cylindrical surface of the work throughout the polishing operation, a pair of platen bars 104 (Figs. 1 and 5) are mounted upon a carrier 105 to extend transversely across the inner side of the cushioning belt`11, above and below the work. The platen bars 104 are actuated under the control of the operator, to yieldingly press the cushioning and abrasive belt forwardly at points sli htly above and below the work. To this en the platen bar carrier 105 is secured to the forward end of a horizontal rod 106 which is supported with provision for longitudinal slidin movement with a pair of bearing lugs 10 projecting from the standard 14. The rod 106 is actuated by means of an arm 108 on a rockshaft 109 which is journaled in suitable bearings in the standard 14, the upper end of the arm 108 being forked to straddle the rod. The movement of the arm 108 is transmitted yieldingl in one direction to the rod 106 and to t e platen bars 104` through a coiled spring 110 which surrounds the rod 106, between the arm 108 and a nut 111 which is threaded onto the rod 106 and secured in position by means of a lock-nut 112. In order that the rod 106 may be positively actuated to release the pressure of the abrasive belt against the work when the shaft 109 is rocked in the opposite direction, a nut 113 is threaded upon the rod 106, at the rear of the arm 108, in position to be engaged by the latter when the shaft 109 is rocked in the opposite direction. for securing the nut 113 in position on the rod 106. In order that the platen bars 104 may be conveniently actuated by the opto an arm 115 which is connected by a link 116 with an arm 117 projecting forwardly from a rock-shaft 118.- The rockshaft 118 is suitably journaled in the standard 14 and A lock-nut 114 is 'provided Lerator, the rock-shaft 109 has secured therea foot treadle T is secured to the rock-shaft and projects forwardly within convenient reach of the operator. In order to limit the movement in both directions of the platen bars 104, a pair of nuts 119 are threaded upon the rod 106 upon opposite sides 'of the rearmost of the bearings 107 for said rod.

These nuts may be adjusted to insure only a predetermined extent of movement of the platen bars. By turning the nut 111, the tension of the spring 110 may be adjusted to vary the amount of yielding pressure which is applied to the abrasive belt by means of the laten bars.

In the modi ed form of work supporting and feeding device which is illustrated in Figs. 8, 9 and 10, a roller is employed for rotating the work instead of an endless belt, as in the embodiment of the invention hereinbefore described. Provision is made for tilting the roller longitudinally so that its periphery will travel obliquely across the cylindrical surface of the Work so that the work will be fed longitudinally as it is rotated. In Fig. 8, a piece of work, consisting of a cylindrical base, is indicated at'W, an abrasive belt for polishing the work is indicated at 10, a cushioning belt at 11, and a pair of pressure applying platen bars at 104.

The feed roll, which is indicated at 120, comprises a plurality of flat narrow rings 121, of leather or other suitable material. The rings 121 are assembled in side by side relationship upon a bushing 122, between a head 123, which is formed at one end of the bushing, and a retainer ring 124 which is fitted onto the opposite end of the bushing. The rings 121 are tightly clamped together by means of a nut 125 which is threaded onto the end of the bushing, adjacent the retainer ring 124.

The feed roll 120 is journaled upon the rod 126 which extends through the bushing 122, the opposite ends of the rod being secured in the side Walls of a frame or hous` ing 127 which roll. The feed roll is driven from a shaft 130, which is journaled in bearings in the side walls of the feed roll housing 127, and is connected with the feed roll by means of intermeshing gear wheels 131 and 132 which are secured to the shaft 130 and to the bushing 122, respectively. One end of the shaft 130 projects beyond the housing 127 and has secured thereto a grooved pulley 133 over which passesya rope belt 134 which is driven throughconnections, not shown, from the driving shaft of the machine.

llIn order that the feed roll 127 'may be tilted axially so asto feed the work longitudinally, the feed roll housinl 127 is mounted for angular or tilting adgjustment about a horizontal axis normal to the axis of the feed roll. To this end the feed roll housing is provided with a pair of axially alined bearings 136 which are adapted to receive a pair of trunnions 137 which project laterally from opposite sides of the reduced upper portion of a post 138, the latter being secured by means of a bolt 139 partially encloses the feedA to a bracket 140 which is rigidly but adjustably supported, as will hereinafter appear. To permit the trunnions 137 to be re- (eived in the bearings 136, each of said bearings is made in two parts, as shown in Fig. 8, divided along a horizontal axial nlane and secured together by screws 141.

To provide for angular adjustment of the feed roll 120, the feed roll housing 127 is provided with a pair of lugs 143 (Fig. 9) which depend obllquely from the rear portion of the housing upon opposite sides of the post 138. .Adjusting bolts 144 severally extend through the lugs 143, the inner ends of the bolts engaging inclined bearing faces 145 which are formed on the opposite sides of the upper portion of the post 138. By manipulating the adjusting bolts 144, the feed roll housing may be angularly adjusted to impart the required degree of inclination to the feed roll. The extent of tilting adjustment of the feed roll housing toward either side of a vertical. position is limit/ed by the engagement of the under face of one or the other of the lugs 143 with the correspending bearing face 145 on the post 138.

In order to adapt the machine to operate upon cylindrical articles of different diameters. provision is made for adjusting the feed roll 120 both vertically and horizontally. To this end the bracket 140 which carries the feed roll housing is secured by means of bolts 147 to the upright web of an angle iron beam 148 which is secured to the upper end of a vertical post 149. The post 149, as shown in Fig. 10. extends through a guideway formed in a bracket 150, the guideway being split, as indicated at 151, and provided with a clamping bolt 152 by means of which the guideway may be contracted to clamp the post in the bracket.

153 which projects forwardly from the standard 14 and extends through a guideway which Ais formed in the'bracket at right angles to the guideway which receives the vertical post 149, the first mentioned guide- Way being split, as indicated at 155, and provided with a clamping bolt 156 by means of which the bracket 150 may be Vclamped to the post 153. By loosening the clamping bolts 152 and 156, the post 149 may be shifted longitudinally in the bracket 150 and the bracket 150 may be shifted laterally upon the post 153, and in this way th-e feed roll 120 may be readily'adjusted both vertically and horizontally. The feed roll may be firmly secured in adjusted position by tightening said clamping bolts. Ordinarily the belt 134 will not interfere with the tilting or with the vertical adjustment of the feed roll, butV obviously a belt tightener may be employed to take belt as may be required to permit free ad justment of the feed roll.

The bracket 150 is supported upon a stationary horizontal post up or let out slack in the` A work rest of modified construction is employed in the device illustrated in Figs. 8 to 10 inclusive. This Work rest, which is indicated at 158 in Fig. 8, comprises a. strip of suitable material which is arranged to extend horizontally between the abrasive belt 10 and the feed roll 120, the upper edge of said strip engaging the under side of the cylindrical surface of the work and serving, in conjunction with the feed roll 120, to support the work. In order that the work may be thus supported, the work rest 158 is arranged to engage the cylindrical surface of the work, as shown in Fig. 8, on the side of its vertical axial plane which is farther from the feed point. To this end, the work rest is mounted, as will now be described. The lower portion of the work rest is riveted to the beveled edge 159 of a work rest carrier or plate 160 so as to be disposed at a slight angleto the plane of said plate. The carrier plate 16() is secured to a carrier port 162 by means of a pair of bolts 163 which extend through transverse slots 164 in an upwardly projecting web 165 formed at the forward end of said support, the slots permitting the upward or downward adjustment of the work rest relatively to the support 162. The work rest carrier support 162 comprises a pair of parallel arms 166 which are connected by the web 165 and are disposed at right angles thereto. The arms 166 are secured to an inclined portion of the bracket 140 upon which the feed roller housing is mounted by means of a pair of screws 168, which severally depend from the under side of each arm 166, the screws extendingthrough slots 169 in the bracket 140 and being provided with clamping nuts 170 which engage the under side of the bracket and clamp the support 162 in position thereon. -The slots 169 permit adjustment of the support 162 relatively to the bracket 140, and the inclination of said bracket is such that when the nuts 170 are loosened and the support 162 adjusted to move the Work rest 158 toward or from the feed roll 12() to accommodate pieces of work of different sizes, the work rest will also be adjusted vertically the required amount to maintain the work in the proper vertical relationship to the feed roll, i. e., with its axis substantially in the horizontal axial plane of the feed roll. In order that the axis of the work may be maintained in the same horizontal plane irrespective of the size of the work, the work rest and the feed roll are adapted t0 be adjusted both horizontally and vertically as a unit by shifting the position of the post 149 and the bracket 150, as hereinbefore described.

It is to be understood that the invention is not limited to the embodiments thereof herein illustrated and described, but maybe variously changed or modified without deplate supparting from the spirit and true scope of the invention as set forth in the appended claims. l

The invention having been described, what is claimed as new is 1. In a machine for grindingr or polishing cylindrical articles, an abrasive element moving in a direction substantially perpendicular to the axis of the work arranged to engage one side of the work, means for supporting the abrasive element and driving it to grind or polish the work, means for supporting the work including an endless be t for engaging the opposite side of the work, and means for supporting said belt and driving it continuously in the same direction to rotate the work while it is being ground or polished.

2. In a machine for in" cylindrical articles, moving in a dicular to the axis of the work arranged to engage one side of the work, means for supporting the abrasive element and driving it to grind or polish the Work, an endless belt for engaging the opposite side of the work. means for supporting the belt and driving it continuously in the same direction to rotate the Work while it is being ground or polished, and a work rest between the abrasive element and the belt for supporting the work in position to be operated upon.

3. In a machine for grinding ori polishan abrasive element grinding or polishing cylindrical articles, an abrasive element moving in a direction substantially perpendicular to the axis of the Work, means for supporting the abrasive element and driving it to grind or polish the work, means for supporting the work in position to be operated upon including an endless belt for engaging the peripheral surface of the work, said belt belng adapted to travel across said surface in a direction oblique to `the axis of the work to rotate the Work and feed it longitudinally While it is being ground or polished, a'nd means for supporting and driving said belt.

4. In a machine for grinding or polishing cylindrical articles, an `abrasive belt, means for supporting the abrasive belt and driving it to grind or polish the work, means for supporting the work while it is being operated upon including a second endless belt for engaging the peripheral surface of the work, said second belt being adapted to travel in a direction oblique to the direction of travel of the abrasive belt to rotate the work and feed it longitudinally, and a work rest between said Ybelts arranged to maintain the work with its axis substantially perpendicular to the path of movement of the abrasive belt.

In a machine for grinding or polishing cylindrical articles, an abrasive belt for direction substantially perpeniio grinding or polishing the work, an endless non-abrasive belt moving in a direction opposite to and in a path substantially parallel to the abrasive belt. and means for driving said belts.

6. In a machine for ing cylindrical articles, adapted to engage one side of the Work, means for supportin the same and driving it to grind or polis the Work, means for supporting the work While it is being operated upon comprising traveling means engaging the opposite side of the Work and tending to rotate the work and a` Work rest engaging the cylindrical portion of the work and offset from the vertical axial plane of the work toward the side nearer the abrasive element.

7. In a machine for grinding and polishing cylindrical articles, an abrasive belt adapted to engage one side of the Work, means for supporting the belt and driving it to grind or polish the Work, a work rest engaging the bottom face of the Work adjustable in a path inclined at such an angle to the vertical axial plane of the work that adjustment of the work rest for pieces of work of different diameters will maintain the work rest in engagement with corresponding portions of the work relative to its vertical axial lane without changing the horizontal axial) plane thereof.

8. In av machine for grinding or polishing cylindrical articles, an abrasive belt adapted to engage one side of the work, means for supporting said belt and driving it to grind or polish the Work, a second belt for engaging the opposite sideof the work, means for supporting the second belt and driving it to rotafte the work, arlid a tationa su ort or en aging t e c indrical'ysurfges of the wgcrirk throu hebt a substantial portion of its length on t e same side of its vertical axial plane as the abrasive element.

9. In a machine for grinding or polishing cylindrical articles, an abrasive element adapted to engage one side of the work, means for supporting said element and driving'it to grind or polish the work, means for supporting the work in position to be operated upon comprising traveling means for engaging the opposite side of the work, and a work rest for engaging the cylindrical surface of the work at the same side of its vertical axial plane as the abrasive grinding or polishan abrasive element element, means for supporting and drivlng `said traveling means, and means for adjusting the work rest bothvertically and horizontally by a single operation to adapt 1t to support pieces of work of differentl diameters.

10. In a piachine for in cylindrical articles, a apted to engage 'one grinding or polishan abrasive element side of the work,

means for supporting said element and driving it to grind or polish the work. means for supporting the work in position to be operated upon comprising traveling means for engaging the ipposite side of the work, and a work rest or engaging the cylindrical surface of the work, means for supporting and driving said traveling means, and means for concurrently adjusting the traveling means and the work rest relatively to the abrasive element to accommodate pieces of work of different diameters.

11. In a machine for grinding or olishing cylindrical articles, an abrasive e ement for engaging one side of the Work to grind or polish the same, means for supporting and driving the abrasive element, means for supporting the Work in position to be operated upon comprising traveling means for engaging the opposite side of the work, and a Work rest for engaging the cylindrical surface of the work, means for supporting and driving said traveling means, and means for relatively adjusting the abrasive element and the traveling means to accommodate pieces of work of different sizes and for con currently adjusting the work rest to adaptit to engage corresponding portions with relation to the vertical axial planes of pieces of work of different sizes.

12. In a machine for grinding or polishing cylindrical articles, an abrasive element, means for supporting and driving the same, means for supporting the work in position to be operated upon by the abrasive element 100 including traveling means adapted to engage the cylindrical surface of the work, said ytraveling means being mounted with provision for an ular adjustment relatively to the work to adilpt it to feed the Work lon- 105 gitudinally, and means for supporting and drivin said traveling means.

13. n a machine for grinding or polishing cylindrical articles, an abrasive element, means for supporting and driving the same. 110 means for supporting the work in position to be operated upon by the abrasive element including a traveling belt adapted to engage the cylindrical surface of the work, said belt being mounted with provision for angular 115 adjustment relatively to the work to adapt it to feed the work longitudinally, means for supporting and driving the belt, and means lf)or gaging the angle of inclination of the elt.

14. In a machine for grinding or polishing cylindrical articles, an abrasive element, means for su porting and driving the same, a work rest or supporting the work while it is being operated upon, a traveling belt for engaging the opposite side of the work, means for supporting the belt and driving it. and means for adjusting the belt toward or from the abrasive element and concurrently with said adjustment to shift the work rest both vertically and horizontally to ada t the machine to operate upon articles of di erent sizes.

15. In a machine for grinding or polishing cylindrical articles, an endless abrasive belt, means for supporting and driving said belt to grind or Vpolish the work, and means for holding the work against the abrasive belt with its axis substantially per endicular to the direction of movement o the operative portion of the latter and for feeding the work longitudinally during the grinding or polishing operation including an endless belt adapted to engage and travel obliquely across the work on the side opposite that which is engaged by the abrasive element.

16. In a machine for grinding or polishing cylindrical articles, an abrasive element, means for supporting and driving the same, 20 a work support preventing movement of the 4 work onl in the direction of movement of the abrasive element, and means for holding the work unyieldingly against the thrust of the abrasive element and feeding the work in an axial direction com rising a member adapted to engage the cy indrical surface of the work throu hout a substantial portion of the length ci: the work.

17. In`a machine for grinding or polishing cylindrical articles, an abrasive element, means for supporting and driving the same, a work support preventing movement of the work only in the direction of movement of the abrasive elemen means for feeding the work in an axial direction comprising an endless belt adapted to engage the work and travelin obliquely to the path of movement of the a rasive element, said belt to receive the thrust of the abrasive element.

18. In a machine for grinding or polishing cylindrical articles, an abrasive element, means for sup orting and driving the same, and means orho ding the wor against the abrasive element with its axis normal to the direction of -movement of the operative portion of the latter and for `feedthe work longitudinally during the grinding or olishing operation including an endless be t inclined in the direction of the length of the work and Vadapted to engage and travel across the work on the side opposite to that which is engaged by the abrasive element, said belt being suprted to\ ermit adjustment thereof to vary its incline relation to the work.

19. In a machine for grinding or polishing cylindrical articles, an endless abrasive belt arranged to engage one lside o the work, means for supporting thebelt and driving it to polish the Work, traveling means for engaging the opposite side o the work, means for supporting and driving said traveling means, and means enging the cylindrical surface of the work 65 or supporting the work comprising a work to the path the abrasive belt and respect to said traveling rest extending perpendicularly of movementY of obliquely with means.

20. In a machine for grinding or polishing cylindrical articles, a travelin belt arranged to engage one side o the work, and means for supporting the work in position to be operated upon comprising a second traveling belt for engaging tlie opposite side of the work, the belts moving in opposite directions in substantially parallel paths, and a stationary work rest substantially perpendicular with respect to the paths of movement of the belts.

21. In a machine for grinding or polishin cylindrical articles, a traveling abrasive be t for engaging one Side of the work, means for supporting the work including a traveling work supporting belt for engaging the opposite side of the work, said belts moving in paths substantially erpendicular to the axis of the work, an means drivin said belts.

22. n a machine for grinding ing cylindrical engaging one side oi the work, and traveling in a path substantially perpendicular to the axis of the Work, means for supporting the work including a traveling work supporting belt for engaging the opposite side of the work, said belt being adapted to travel obli uely with respect to the a rasive belt to fee the Work in a longitudinal direction and means for drivin said belts.

23. In a machine for grin ing-'or polishing cylindrical articles, a traveling abrasive belt for engaging one side of the work, work supporting eans including a traveling work supporting belt for engaging the opposite side of the work and rotating it at a -relatively low rate of speed, means for supporting and driving said Work supporting belt. and means for supporting the abrasive belt and driving it at a relatively high rate of speed. 1

24. A machine for grinding and polishing cylindrical articles com rising a work supporting member upon w ich the article to be operated upon rests, an abrasive belt arranged to pass downwardly in engagement with one side of the article, and a supporting belt arranged to engage the opposite side of the article to hold the same against the abrasive member, and means for moving the supporting belt, the' supporting belt having provision for adjustment angularly with respect to the abrasive member to cause the work to be moved transversely thereof. i

.25. In a machine for grinding ing cylindrical articles an abrasive belt for operating upon the work,'tra`veling means obli uely adjustable with respect to the path of lie abrasive belt, a wor rest disposed for or polishor polishabrasive y,

articles, an abrasive belt for )crpendicularly with respect to the abrasive lielt, and means for supporting and driving the abrasive belt and the traveling means.

26. ln a machine for grinding or polishing cylindrical articles, an abrasive belt for grinding or polishing the work, means4 lor supporting and driving the abrasive belt, means for supporting the work, a feed belt for rotating the work and feeding it in a longitudinal direction, said belt being adjustable toward and from the abrasive belt to accommodate pieces of work of different sizes and obliqueljv with respect to the abrasive belt to vary the rate of longitudinal feed of the work, and means; for driving the feed belt comprising a bevel gear having its axis adjustable obliquely with the feed belt, an idler bevel ear meshing with the first gear co-axial with the axis ol oblique adjustment of the feed belt, a third bevel gear meshing with the idler gear and having a fixed axis, a main shaft, and an intermediate sliaft connected to drive the third bevel gear, the intermediate shaft being journaled in swiveled bearings having a sliding driving connection with the main shaft.

27. In a machine for grinding or polishing cylindrical articles an abrasive element arranged to engage one side of the work, means for supportlng and driving the lsame, a i'eed bell for engaging the opposite side olthe work, means for supporting the feed belt includingr a housing therefor, a bracket upon which the housing is mounted with provision` for tilting adjustment to vary the angular relation of the feed belt with respect to the work, means for clamping the housing in adjusted position, means for supporting said bracket to permit adjustment ol ttlie feed belt toward or from the work, and means for adjusting said bracket.

2u. In a machine for grinding or polish ing cylindrical articles, an abrasive element for engaging one side of the work, means for supporting and driving the same, a feed belt for engaging the other Side of the work, means for vupporting the :leed belt including`a housing, a pivot stud carried by the housing, a bracket in whieh the stud is adapted to turn, an idle bevel gear journaled on the stud, a second bevel gear journaled on the housing and meshing with the idle gear, a third bevel gear journaled on the bracket anduneshing with the idle gear, and means for rotating the third gear to drive the feed belt.

RUFUS W FULLER.

CIG

Certicate of Correction.

It is hereby certified that in Letters Patent No. 1,421,205, granted June 27, 1922, upon the application of Rufus W. Fuller, of Deerfield. Massachusetts, for an improvement in Work Holding and Feeding Devices for Grinding or Polishing Machines, errors appear in the printed specification requiring correction as follows: Page 1,1ne 54, before the wor'd type insert the word belt; page 5. line 19, for the word base read tube; and that the said Letters Patent should be read with these corrections therein that the same may conform to lthe record of the case in the Patent Ooe.

Signed and Sealed this 31st day of July, A. D., 1922.

[SELL] KARL F ENN ING,

Acting Uommoner of Patents.

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