US1922817A - Grinding machine - Google Patents

Description

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GRINDING MACHINE Filed Sept. 17, 1930 7 Sheets-Sheet 3 MMM /1//70/70# mventor @MMM lwf( (torneg Aug. l5,` 1933.

w. K. MoR-roN 1,922,817

GRINDING MACHINE.

Filed Sept. 17, 1930 '7 Sheets-Sheet 5 ff/ G. 7

Z5 ZZ Gttorucg Allg. 15, 1933. w, K, MORTON 1,9'2?,81'

' QRINDING MACHINE Filed sept. 17, 1930 sheets-sheet- 6 /ff /05 v /c/G. y /25 2z Q5 w /OZ /00 /O/ Work, and employing rotary grinding tools for' Patented Aug. 15, 1933 UNITED STATES vPAUTEN'T QFFQE Application September 17, 1930 9 Claims.

My present invention relates to an improved grinding machineoi the type using an endless conveyer, or conveyor chain, with a one-Way traverse or Working flight, for conveying the the purpose 01' grinding the Work.

The grinding machine of my invention is es pecially designed for grinding or finishing Wall tiles to a predetermined size, say exactly six inches long by three inches wide, and with a thickness ci threeeighths of an inch. The tile, in the course oi manufacture, are fashioned `with the above dimensions in View, but due to various reasons that are usually beyond reasonable control, the tile come larger than the above indicated length and with. By the utilization o the present machine, the tile are passed successively through the machine, with rapidity, and they accurately and uniformly ground to the predetermined dimensions.

In carrying out the invention the machine is constructed of a dual character, including duplex, or a plurality of sections, one for conveying the tile in lengthwise position while being ground, and the other section for conveying the tile hroadside or laterally while being ground, and means, intermediate these duplexv sections, are employedior transferring the tile from one section to another and at the saine time turning the tile through an arc of ninety degrees.

The rectangular tile, in addition to having its edges ground to the desired dimensions, also has a bevel imparted to all of its edges, as it passes through the sections oi the machine.

Figure 1 is a plan view oi a grinding machine involving the present invention.

Figure 2 a top plan view at an intermediate position between the feed end and the discharge end of the machine, showing the rotary conveyor for changing the relative position oi or turning the tile through an arc oi ninety degrees and moving the tile from one section of the machine to another section.

Figure 3 is a View in elevation of the parts in Figure 2.

Figure 4 is a top plan View of one of the hori- Zontal grinding tools for grinding a longitudinal edge of a tile.

Figure 5 is a plan View at the discharge end of the machine showing one of vthe edge-recycling grinding tools, and Figure 6 is a view in elevation at the left end or the parts'in Figure 5, or taken at line 6 6 of Figure 1.

Figure 7 is a plan view of one ofthe vertical- 1y` disposed rotary grinders and accessories.`

Figure 8 is a detail View as at line 8 8 of `Figure 1, showing the rotary transfer wheelrfor the tile.

Figure 9 is a detail transverse sectional view at line 9-9 of Figure 6. 60

Figure 10 is a detail transverse sectional View as at line 10-10 of Figure l.

Figure 11 is a transverse, detail, sectional View at line ll-llof Figure 1.

Figure 12 is a detail plan, partly in section oi 65 one of the edge-heveling grinding tools,

Figure 13 is a detail in elevation, of one of the resliently supported blocks for the tile while the latter has its end edges beveled.

Figure 14 is a Vsectional detail View at line 70 14--14 of Figure 13.

Figure 15 is a detail view of one of the spring devices employed with presser hlocl; 'for'fgujd- Ving the tile, and Figure 16 isa plan View of one of the presser blocks.

In carrying out the invention, two sections A and B of the machine have been illustrated, and'in such e'r'emplication oi the invention a single chain conveyor, or endless conveyer l, with transversely arranged cleats is used in 30 section 1, while a double chain Veenveyer or endless conveyer comprising similar chains Ei and 4 is used in section B. The double chain conveyer is provided with transverse cleats 5, and it will be understood that the rectangular or oblong tile T g5 are fed in suitable-manner at the left end of the machine in Figure 1," and after traversing both sections A and B the tile are discharged at the right end of the machine in Figure 1.

The Lipper flights only of the endless chains convey the tile, in horizontal position, and the Vtile pass through section A with their long axes alined with the chain. intermediate the ends of theinachine the tile' are turned through an arc of ninety degrees and transferred'from section 95 A to section E and tile are deposited onV the double-chain conveyer in position transversely of the moving chains.V Thus in section A the long or longitudinal edges of the tile are ground While in section B Athe end, or short edges, of

sure smooth operation of the machine with a minimum amount of friction.

til

The driven sprocket 7 of section A is mounted on shaft 13 also journaled in bearings 11, and like shafts l and 12, this shaft is disposed transversely ofl the longitudinal axis of the machine.

Power is transmitted from the single oonveyer to the double conveyor .through a short chain 14 running over the two spaced sprocket wheels 15 and 16, and of course the conveyers move synchronously or in unison.

The driving sprocket 6 is mounted on the driving or power shaft 17 which may be revolved in suitable manner, as by a motor designated at 18.

The rotating members are journaled in the several bearings 11, and the latter are mounted on the members of the frame designated i9. The machine is elevated a suitable distance above the floor by the use of legs or posts o utilized at positions for the proper support of the machine. i

Each section of the machine is provided with a longitudinally extending gage and guide rail as 21 and 22, secured as by screws 23 to the frame of the machine, and each of these rails has an inclined entrance or guide edge 2li, 25 for theY tile T.

VThe endless conveyors are located in longitudinally extending openings of the machine framefand at the opposite sides of these openings are provided pairs of track boards or rails as 26, 27 in section A andl 28, 29 in section B. The track rails are secured as by screws 30 to the frame and the rails of each track'are spaced apart to support the lateral edges of the tile. In section A the longitudinal edges of the tile slide along the tracks, while in section B the ond edges or short edges of the tile slide along on the tracks, with one edge of the tile in sliding contact with the guide or gage rail 21 or After passing through section A the tile are Yturned through an arc of ninety degrees `and transferred to the double chain conveyer of section B through the instrumentality of a transfer wheel having four arms or spokes 31, each provided with a push plate 32 'for contact with tile while the latter is being turned and transferred. Y

The spokes or arms of the wheel are disposed horizontally and they radiate from a central hub 33 mounted on the upright shaft 34 that ,1 from the end ofthe single-chain conveyer, and

the push-plates 32 of the spokes 31`are in position to contact with the tile and slide them across this transfer plate, as the wheel revolves in synchronism with the vtwo conveyors.

ForV -guiding the tile while they are being pushed by the push-plates, an arcuate guide plate 38 is secured, as by lscrews 39 onthe transfer plate, and it will vbe apparent from an inspection of Figure 2 orFigure 1 that the Atile' moving longitudinally along section A are turned as they are transferred, and thereafter move along section B transversely of the line of travel of the conveyer for the double con-- veyer. The tile or course are carried along on the conveyers and backed by the transversely extending cleats 2 and 5 of the respective conveyers. y

To hold the tile as they are being conveyed through the two sections, sets of presser blocks are employed at the sides of the openings of the machine opposite to the gage plates, for exerting, by friction a clamping action on the tile in connection with the gage plates.

In Figures 1, 7, and 15 especially a feed-presser block as 41 is used at the entrance to both sections, and these feed-presser blocks have inclined edges 42 complementary to the respective edges 24: and 25 of the guide rails or gage plates 21 and 22, for guiding the tile into the respective ways.

The Apresser blocks are adjustable to incre-se or diminish the frictional engagement therewith ofy themoving tile, and the presser-feed blocks are pivoted to the frame at their front ends as at 43.v At their rear ends these presser-feed blocks have arcuate slots 44 for bolts 45 by means of which bolts the blocks may rigidly vbe secured in adjusted position or these bolts may be used as guides for the blocks when a resilient pressure is applied thereto.

Along the two ways of the conveyors, other ,LF

presser blocks as 46 are located opposite to the guide or gage plates, and these presser blocks are fashioned with end slots Li7 through which bolts 48 are passed and secured to the frame.

The presser-feed blocks and the presser blocks, as shown, are both provided with resilient means for pressing them into frictional contact with the tile as they pass through the machine, and for this purpose ilat springs 49 are secured in lrers 50 of posts or bolts 51 and secured by cotter pins52. The bolts secured in upright position in the frame, and the spring blades or flat springs bear against the outer sides of the presser blocks for the purpose of urging them inwardly toward the ways through which the tile travel. In this man"V er the tile are pressed against the inne' faces of the gage plates with a resilient pressure, and the tension of the spring blades may be adjusted or varied to vary the pressure on the tile.

In Figure 1 it will be seen that there are eight vertically disposed grinding wheels 53, two horizontally disposed grinding wheels 54, and two sets of beveling wheels indicated at and 56 respectively, rThe group of three wheels 53 and a horizontal wheel in section A operate on a long side or edge of the tile; the group ci ne vertical wheels and a horizontal wheel operate on a short side or end of the tile; vand the devices at 55 and 56 in the two sections apply the beveled edges to the tile. Other arrangements may be provided and the number of grinding wheels may bevaried, and it will be understood that the arrangement of the mathe purpose of adjusting the grinding wheel 53 with relation to ther edge of the tile T, and

when properly 'adjusted the holder, which is fashioned with a longitudinal slot 60, is clamped in position by the clamp bolts 61 in the slot, and if necessary, guide plates 62 may be secured on the holder to overlap the base plate, as shown in Figure 10. I

The holder is provided with journal bearings 63 for the shaft 64 of the wheel, and apulley or sprocket wheel 65 is mounted on the shaft 64. A belt or sprocket lchain 66 passes from the sprocket wheel or pulley 65 and over a complementary wheel or pulley 66 on the powerV shaft 67 which extends longitudinally along the back of the machine and is journaled in suitable bearings, and the grinding wheels 53 are thus directly driven from the power shaft 67.

The vertically disposed wheels 53 grind the -edge of the tile as it passes along in front of the wheel, and as the circular periphery of the wheel produces a slight concavity in the edge of tile, this concavity is removed by the use of the horizontally disposed wheel 5.4 which is encountered after the group of vertically disposed wheels 53 have been passed.

The horizontal wheels are mounted in tool holders 68 that are slidable in the base plates 69, and adjustable by the use of bolt 59 and slot 60 and bolts 61 similar to the adjustment of the vertical wheels. The base plate 69 is supported on the cross brace 70 and bolted thereto as at 7 1 in Figure 11. Y

The horizontal grinding wheel is carried on the upright shaft 72, and the latter is journaled at 73 in the vertically disposed bearing block 74. At its lower end the shaft is provided. with a bevel gear 75, and below the gear a cross shaft 76 is journaled in the housing 77 of the block. A bevel gear 78 on the shaft 76 meshes with the gear 75, and the shaft 76 is driven through a pulley cr sprocket wheel 79, by a chain 80 passing over the sprocket or wheel 8l on the power shaft 67. In this manner the horizontal grinding wheels are revolved at high speed to eliminate the concave edge ofthe tileas 4the latter passes the revolving wheel.

By the use of these described edge-trimming wheels one long edge and one short edge of the tile is trimmed or ground to insure the desired dimensions for the tile.

In addition to these described grinding tools, two additional devices 55 and 56, are employed for beveling all four of the upper edgesof the rectangular tile T, and these devices are driven from the power shaft 67 and arranged, ,the first -near the end of section A and the second near the end of section B.

Each device 55 and 56 includes a pair` of spaced and opposed'grinding wheels 82, vthe Wheels being spaced farther apart in sectionB than in section A to adapt them to the two different dimensions, length and breadth, of the tile T, and as best seen in Figure 6, the` wheels are located in proper position to Vengagethe opposite, upper edges or corners of the tile as it passes on its conveyer between the opposed wheels.

The wheels 82 are mounted on shafts 83 which are journaled in bearings 84 (Figure 12) carried at the ends of the forks 85 of the holder 86, and the holder is slotted at 87 for accommodation of the pair of bolts 88. In Figure 6 it will be seen that the bolts secure the holders to the opposite outer, inclined sides or ends of a cross head or casting 89, and eachwheel shaft 83 is provided with a pulley as 90.

The pulleys 90 are connected by belts 91 with .the pulleys 92 on shafts 93 and 94, which shafts areA journaled in bearings in the cross head 89, and the shafts which are parallel, revolve in op vpositedirectio'ns due to the meshing of the gears y 95 and 96 on these shafts. u The.- shaft 93 has an additional pulley 97, which is connected as by belt 98 with the` pulley .98 en the power shaft 67, and power is thus transmitted from the power shaft to revolve wheel 82 at the right in Figure 6, counterclockwise, while the opposite wheel 82 revolves clockwise for grinding the bevel on the upper edges of the tile T. Y v

inasmuch as the two devices 55 and 56 are similar in construction and operation, the illustration and description of one `tool applies to both tools.

While the tile is being beveled on its opposite edges, the tile is held against vertical displacement, (as well as lateral or longitudinal displacement) by the employment of a pair of bearing wheels ,100, which are mounted above thelin'e ofv travel of the tile on shaft 101, and the latter is journaled in the bearing head 102 which is bolted to the cross head 89 (see Figures 6 and 9).

These bearing wheels are vertically movable in adapting them to the thickness of the tile through the manipulation of the cross head, which cross head is vertically adjustable by means of the central bolt 103, supported in the bushing 4104: and provided with a lock nut 104'. The cross heads are thus vertically movable and may be secured in adjusted position by the nut 104'.

The bushing 104 is formed integral with a cross brace 105, andthe latter is bolted on top of the legs or inverted Uefrarnes 106 of the main machine frame, the bolt 103 and nut 104 being used to suspend the cross head 89 and bearing wheels 82 from the frame.

As the tilepass under these bearing wheels 82 they are held up against the wheels by a resilient presure from beneath, as best indicated inFigures 9, 13 and 14.

. At opposite sides of the way through which the conveyers and the tile passare arrangedtwo blocks as 108 and 108, having rounded upper ends, ove1 which the bottom surface ofthe laterallyV opposite sides of the tile slide in frictional contact, and these blocks clamp the tile against the bearing rollers, with a sliding grip,

vto hold vthe tile while their opposite edgesv are being beveled. y v

Each friction block 108 is provided with a vertically disposed slot 109 and by means of a bolt 110 the block is loosely supported on a side rail 111 of the main frame of the machine. At the opposite sides of the friction block are provided a pair of guide plates 112 having outstanding flanges 113 between which the friction block is guided'in its vertical movement. Beneath the two spaced friction .blocks 108 is arranged a spring blade ofv flat spring 114 that spans the way of the conveyer, with the ends of the spring bearing up against the bottoms of the two friction blocks. At its center, the flat spring is supported on the top of a bolt 115 and the bolt is las) supported by a cross bar 116 in an adjusting nut tile rides down and over the Ycurved upper end of the two friction blocks, and enters between these blocks and the bearing'rollers or wheels 100, and while thus frictionally 'engaged by the resiliently supported friction blocks, the upper edges of the tile are ground oif'by the abrasive or grinding wheels 82. i Y

The transfer wheel orV tile turner, which shifts and turns the tile from section A to section B of the machine, and its shaft 34 are revolved in unison or synchronism with the two conveyers 1 and 3'-4, from the transmission shaft 12 of the second conveyer. As indicated inf Figures 2, 3, and 8, the shaft 12 is providedwith a pinion 119 that meshes with a gear 120 on the stud shaft 121 located below the conveyer shaft 12 and parallel therewith. 'Ih'e stud shaft is journaled in bearings 122 Vof the frame 123, and the latter is rigid with the main frame of the machine. A bevel gear 124 on the shaft 121 engages a complementary bevel gear 125 on the cross shaft 126, which shaft is journaled in bearings `supported on a rigid part of the frame. The shaft 126 is coupled by a bevel gear 127 with the bevel gear 128 on the lower end of the shaft 34 of the transfer wheel. In this manner the power is transmitted from shaftv 12 to the shaft 34 for the rotation, in synchronism, with the two conveyors, and the transfer wheel successively transfers and turns the tile, as they are `deposited on the transfer platel 36 from the rst conveyer, to the second conveyer.

lIt will be understood that I have illustrated and described an exemplification of the invention, in which the parts are combined and arranged according to one mode thus far devised for the application of the principles of the invention, and it will be apparent that changes and alterations may be made in the exemplified structure, within the scope of the appended claims, without departing from the principles of the invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:-

1. In a duplex grinding machine for fiat tile the combination with a pair of longitudinally` extending conveyers and an intermediate, stationary transfer plate, of a rotary transfer `'wheel having spokes adapted to transfer work across the plate from one conveyer to the other and simultaneously turn the tile on a vertical axis,

and means for operating the conveyers and` wheel in unison.

2. In a duplex grinding'machine for at tile the combination with a pair of longitudinally extending endless-chain conveyers, and an intermediate transfer plate, of a rotarywhee'l having working spokes adapted to transfer work across the plate from one conveyer to the other conveyer and simultaneously turn the tile on its vertical axis, means for driving the chains, power transmission mechanism connectingthe chains, driving means forv the wheel, and means for transmitting power driving means.

from the chains to said I 3. In a duplex grinding machine for tile the combination with a transfer plate having an upright, arcuate guide on its upper face, of a transfer wheel having working spokes for transferring tile across the plate and simultaneously turning the tile on its vertical axis, operating ymeans for the machine, and driving means for the Wheel actuated synchronously with the operating means.

4. In a' duplex grinding machine the combination with a pair of conveyers, of an intermediate wheel and operating means whereby work is transferred by the Wheel from one conveyer to the other and turned, a plurality of rotary grinding tools and operating means therefor, and means co-acting with the conveyers for gaging and guiding the work.

5. In a rotary grinding machine, the combination withva conveyer, of an adjustable bearing wheel above 'the conveyer, side'rails for the work, presser blocks mounted on the side rails for engaging the under surface of the work, and resilient supports for said blocks in coaction with the bearing Wheels.

' 6. In a rotary grinding machine, the combination with a conveyer, tile supporting rails at the sides of the conveyer, a vertically movable cross head above the conveyer and means for holding said head in adjusted position, of adjustable grinding wheels carried by said cross head, bearing wheels between said grinding wheels, presser blocks mounted on the rails below the conveyer, and resilient supports for said blocks.

7. In a rotary grinding machine, the combination with a conveyer, and lateral supporting rails of a vertically movable cross head having inclined endsyand means for holding said head in adjusted position, a rotary grinder at each v:ide of the conveyer and a slotted holder for each grinder, bolts for holding said slotted holder in adjusted position on the inclined ends, slotted presser blocks mounted on the side rails beneath the conveyer and guide bolts therefor, resilient supports for said blocks, 'and bearing 'wheels mounted on the cross head above the conveyer.

8.` In a grinding machine the combination with' a conveyer and operating means therefor, of a stationary gage-plate having an outwardly Yflaring entrance edge and located at one side `of the conveyer, a pivoted presser-feed block at Lthe other side of the conveyer having a compledepressibley friction-blocks mounted on said rails and provided with upper rounded edges, retaining bolts for the blocks, guide means for the blocks, and spring for lifting the blocks.

WILLIAM K. MORTON.

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