US1660350A - Machine for rounding the edges of sheets of material - Google Patents

Description

Feb. 28, 1928.

W. OWEN MACHINE FOR ROUNDING THE EDGES OF SHEETS 0F MATERIAL 6 os-Sheet l Filed April 8. 1926 Feb. 28, 1928.

W. OWEN MACHINE FOR ROUNDING THE EDGES 0F SHEETS 0F MATERIAL Filed April 8, 1926 6 Sheets--SheecI 2 f vm, :Wm n u W L W f,

Feb. 28, 1928.

W. OWEN MACHINE FOR ROUNDING THE EDGES OF SHEETS OF MATERIAL Filed April. 8. 1926 6 Sheets-Sheet 5 Feb. 28, 1928.

W. OWEN MACHINE FOR ROUNDING THE EDGES OF SHEETS OF MATERIAL Filed April 8. 1926 6 Sheets-Sheet 4 Nm. lvm;

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n m /NvE/vTaR Q M gui" Feb. 28, 1928.

, W. OWEN MACHINE FOR `ROUNDINGr THE EDGES- 0F SHEETS OF MATERIAL Feb. 2s, 192s. 1,660,350

- .W. OW EN MACHINE FOR ROUNDING THE EDGES OF SHEETS OF MATERIAL med April s, 192e e sheets-sheet s /NVENTOR Patented Feb. 28, SZh- WILLAM OWEN, F PITTSBURGH, PENNSYLVANIA, ASSGNOR T0 PETTSBURGH PLATE GLASS COMPANY, A CORPORATION OF PENNS'IL'VMA.

Application led April 8, 1926. Serial lo. 100,606.

The invent-ion relates to machines for rounding or bcveling the edges of sheets, such :is the glass .sheets used in automobile wind shields and bodies. The principal objects of' the invention are the provision of a machine of simple construction; (l) which will operate at large capacity for a. long period of time without any requirement for replacing or resurfacing the abrad-l ing Wheels; (2) in which the roughing wheels, which bear the brunt of' the work are self-dressing, and may be used until worn outL Without redressing; in which chipping of the edges of the sheets is avoided and uniformly rounded edges with Well finished surfaces are secured; and (4C) in which improved means are provided for carrying the sheets over wheels and for maintaining the glass sheets in proper relation to the grinding Wheels. Certain embodiments of the invention are shown in the accompanying drawings, wherein:

Figure 1 a side elevation of the complete machine. Fig. 2 is a plan view. F iv. 3 is a section on the line III-H of Fig. 1. Fig. 4 isa section on the line FV-IV of Fig. 2. Fig. 5 is an enlarged detail section through one of the cup grinding members. Fig. 6 is a detailplan view. Fig. 'l' is a detail sectional view on the line VII-VII of Fig. 6. Fig. 8 is a detail plan view of the 'construction shown yin Figs. 6 and 7. Figs is a diagrammatic view showing the relative positions of the cup grinding Wheels and' their relation to the glass sheet Whose edge is being rounded. Fig. 10 is a section on the line X.-X of Fig. 1. Fig. 11 is alsec tion on the line XI-XI of Fig. 1. Fig. l2 is an enlarged detail section taken in the same plane as Fig. 11. Fiv. larged plan view at the left hand end of the machine of Fig. 1. Fig. 14 is an enlarged section on the line XIV-XIV of Fig. 13. Figs. 15 and 16 are detail views showing a modification, Fig. 15 being a plan view and Fig. 16 being a transverse section. And Fig. llis a transverse section through a modified form of construction.

The machine as illustrated and described comprises auoughing unit having six surfacing wheels and a finishing unit having" four surfacing Wheels, but the number of wheels may be varied to meet requirements.

,the four Wheels 4, 5,

the surfacing y Referring to Figs. 1 and 2, the roughing unit comprises the pairs of Wheels l, l, 2, 2, and 3, 3, While the finishinor unit comprises 6 and 1n operation, the glass sheets 8, 8, 8, etc., whose edges are to be rounded to the contour indicated at A in Fig. 9, are carried longitudinally over the ten wheels from the left hand end of the machine to the right hand end by means of two endless belts 9 and 10, such belts heing provided with clamping means for gripping the opposite sides of the plates and supporting them during their passage along themachine. \fl`he pairs of roughing wheels 1, naaand 3,3 of the sheet as angles and, the bevelsl which mer e into each other, as indicated in Fig. 9. The edge is, ofcourse, still tgiey are placeat dierent r unfinished after passing these Wheels, but

the major portion of the work is accom pllshed, and what remains is finished by the first two finishingwheels 4 and 5, which are circumferentiall contour which it is dI of the glass sheets. 7 are preferabl made of a rub esired to give the edges The final wheels and polishing wheels, ordinnly er composition and supplied with a polishing mixture, such as water and um1ce. Thls gives the edges their final finis after which they are carried along by `the chains 9 and l0 to the end of the machine and there released. During the passage of the plates from one end of the machine to the other, they are unsup orted, except for the clampin means which gri their opposite sides, an the chains 9 and 10 which carry the grip ing means are so guided and su ported t at` the lower edges of the plates w ich are being surfaced move ahead throughout their travel on substantially a right line, the only deviation from such line eing that incident to the grinding away of the material. The ten abrading and finishing wheels are all made vertically adjustable independently, so that each wheel can be so positioned as to do its proper share of work, thus distributing the wear in as uniform a manner as is possible between the various wheels. The glass plates are very firmly gripped by the clamping devices carried y the chains 9 and 10 so thatithere is substantially no slippin of the` plates to cause them to deviate om practically shape the edgev grooved to the exact fore, grund a plurality of Peo if they were v l their proper lines of movement. This securit in the support of the plates is facilitatedY by the use of grippiner devices, as later described, which are slightly yielding, so that under the force applied to the plates by the grinding wheels, there yis not the same tendency for the plates to slip and change their positions, as would be the case supported with absolute rigidity upon the chains. Under these conditions of use, any interruptions of the` operation of the machine for replacement and y repair are slight. The roughing wheels 1, 1, 2, 2, and 3, 3, are self-dressing, as later set forth, and may be used until worn out without redressing, while the wheels 4 and 5, which do require redressing, need this opera tion only at long intervals because the roughing wheels fpreceding these Wheels reduce the edges o the sheets to such an extent that the work left for the finishing wheels is relatively slight, and the wear upon the wheels correspondingly slight and very uniform.

The carrier chains 9.and which support the glass sheets and carry them over the surfacing Wheels extend around the pairs ofsprocket wheels 11 and 12 and "13 and 14 (Fig. 2) carried by the vertical ` shafts 14, 15, 16 and 17. The shaft 14is driven from the motor 17a through the intermediary of thechain belt 18 and worm wheel and worm reducing gearing in the casing 19, while the shaft 1s driven from the shaft 14* by means of a spur gear 21 on the shaft 14 meshing with a similar gear 21 on the shaft 15. The chain comprising the endless carriers is made up of side plates 21 and 22, as indicated in Figs. 12 and 13, connected by pintles 23 earrylng rollers 24. The inner ights of the two chains are supported in guide members 25 and 26 secured to the base late 27 of the machine, as indicated in igs. 11 and 12, and carry the U-shaped members 28 pon which are mounted the clamping devices for the glass sheets 8, 8, 8,

etc. These clamping devlces consist of cups 29 ofr'ubber composition carried by the bolts 30 extending slidably through the U-shaped members 28 and held yieldingly in forward position by means of the relatively sti coil springs 31. The upper portions of the sheet are steadied against lateral movement by means of the'plates 32, 32 (Fig. 11)

mounted upon the channels 33, 33 and pro-z vided at their inner edges with the rubber pads'ai, a4.

The glass plates 8, 8, 8, etc. are ositioned between the clamping devices on t e carrier chains 9 and 10 by placing them in the runway 35 shown in detail in Figs.`13 and14. This runway comprises a channel 36 in which are mounted a pair of wood strips 37, 37 spaced apartA and provided 4at intervals with rubber rolls 38 pivoted upon the pintles 39. The operator places the plate which is to be gripped between the chainsupon the rollers 38 and moves it along horizontally until it is gripped by the rubber cup members 29.- The bottom of the runway, which thus guides the plates to the gripping chains, is accurately positioned with respect to the cutting surfaces of the abrading Wheels, so that when the sheet is carried over the abrading wheels, just -the proper amount of cutting action is applied by the wheels. As heretofore stated, each wheel is adjusted at a vertical position, such that. it will do its proper proportion lof cutting, provided the glass sheet is securely held against vertical movement and guided in a right line in its passage through themachine. The gripping devices, including the rubber cup members 29 and the chains are designed to support the sheet in the manner indicated. The cups grip the glass very firmly, so that under the action ofl the abrading wheels, there is no slipping, and the glass is pressed yieldingly against Vthe wheel with just the proper amount of pressure to give the desired speed of cutting without forcing the work and causingr chipping. At the same time, the support afforded by the cups is slightly' yielding, which reduces the danger of the plates being caused to slip between the cups and reduces the dan er of chippin which would occur if the p ates were rigi ly held. The gu-ideway 35 makes it easy for the o )erator to feed the plates with very slight e ort and with the assurance that each plate will be properly1 'positioned between the carrier chains, and when the sheets have passed through the machine, they are-automatically freed from the gripping devices so that the labor of removing them fromY the machine isreduced to a mmimiim.

In order to steady the lower portions of the plates 8, 8, 8, etc. as they pass over the sets of roughening wheels 1, 1, 2, 2, and 3, 3

a pair of longitudinally extending guides 40, 40 (Figs. 2 and 11) are employed,. such guides belng 1n the form of a pair of rods coveredv with rubber tubing and located closely adjacent the lower edges of the glass sheets. Rolls are preferably employed for this purpose instead of non-rotating guides, as they* give a longer life, the rolls being rotated as the work progresses and presenting new surfaces for wear. The rolls grip the sides of the platexlightly and support 1t during the grinding operation, thus reducing the tendency to chip andA break and maintaining the edge of thesheet against lateral deflection under the pressure of the grinding wheels. In order to accommodate diierent sizes of glass, these rolls are referably mounted, so that they may be a justed toward =and from each other and are provided with vielding holding means so 'that they will adjust themselves automatically to tlf) lll() neecrseo glass ot varying thickness. The method. of mounting is shown in Figs. 6 and 7. Ashere shown, the ends of the rolls 40, are pivoted in blocks 41, 41 carried upon vertical pins 42,42, and such pins are mounted at their lower ends inv a disc 43. By rotating the discs at the two ends of the rolls, the rollers may be adjusted toward andfrom each other, and this rotation is accomplished by means of a lever arm 44 pinned to the downwardly extending shank 45 of the disc 43. This lever arm is adjusted by means of the threaded rod 46 pivoted to the arm 44 and carrying the nuts 47. A spring 48 intermediate the bracket 49 and the nuts 47 serves to hold the lever arm 44 and the rolls 40, 40 in yielding contact with the glass sheets passing therebetween. An adjustable stop bolt 50 serves to limitthe movement of the rolls toward each other, so that the rolls are always .separated for the reception of the oncoming glass sheets.

rll`l1e rolls 40 below the gripping means on the chains 8 and 9 in conjunction with the stead plates 32, 32 (Fig. 11) serve to hold the g ass plates very securely against vibration and against lateral movement, while the gripping devices, as` heretofore pointed out, securely maintain the plate against vertical movement, thus giving the glass plates proper support in all directions during the grinding operation. rlhis support of the plate is particularly desirable in connection with the roughing wheels 1, 1, 2, 2, and 3, 3 which impose more strain upon the plates than is the case with the grooved wheels 4, 5, 6 and 7, which latter by their form more or less guide the edge of the glass plates and give them support against lateral vibration..

The arrangement of the roughing wheels will be understood by reference to Fig. 9 in connection with Figs. l, 2, 5 and 11. The

wheels 1, 1 lie at the sameangle to the horizontal, but on opposite 'sides of the glass sheet. Similarly as to the wheels 2, 2, and 3, 3, whose angles depart :trom those of the wheels 1, 1.` The relative angles of the wheels will be seen by referenceto Fig. 9 which shows the three wheels which act upon one corner of the plate, thev other three wheels being similarly disposed on the other side of the center line B-B. Cup wheels are preferably used, `as such wheels `are selfdressing and may be used until Worn out without anyrequirement for resurfacing or truing up. These wheels may be of any suitable abrading material of a ineness such that the abrading action does not cause a chipping of the glass. 4s will be seen by reference to Fig. 5, the axis of rota-tion C oi' each wheel is slightly tilted trom the vertioai so that the grinding surface. of the wheel lies at a slight angle to the edge ot the glass which is indicated by the dotted line D of Fig. 5. As a result, only the portion of the wheel to the left of the axis of rotation C (Fig. 5) engages the glass, the other half ot the wheel lying to the right of the axis of rotation being out of Contact with the glass. i have found that the cutting action is better when the wheels are direction of rotation is reversed. Fach' 4wheel is mounted upon an axle 51 (Fig. 5)

carried ina sleeve 52 and rotatable upon the roller bearings 53, 53.' rlhe sleeve is mounted for vertical adjustment in a. member 54 bolted to the casting 55 andthe casting is supportedupon a suitable underram'in 56. The member 54 is split so vthat when tig tly clamped by the bolts 57, the sleeve 52 isl held securely against vertical movement. rlhe sleeve 52 is'provided at its upper end with a guard casing 58 and the lower side of this casing is engaged by a stop screw 59 which serves as a means for adjusting the vertical position of the grinding wheel and positively holding it against downward movement. The sleeve 52 is held against rotation by means of the hollow screw 60 which is provided with a passage for supplying grease to the cavity 61 surrounding the axle 51; rlhe grinding wheel'is clamped to' the axle by means of the nut 62 and suitable protectors 63, 63 are provided at the ends of the axle to guard the bearin s against the admission of moisture or grit. rlhe axles of they grinding wheels are preferably driven by means of the Hexible shafts los 64, 64, 64, etc., terminating at`the stub shafts e 65, 65, 65, etc., carried by the gear casing 66. These stub shafts are provided with intermeshing spur gears 67, 67, 67, etc., one of which .has its end extended and is provided with 'a sprocket around which passes the silent chain 68 driven from the motor 69. f

After the glass sheets have passed the ro'ughing unit, they are carried over the itour finishing wheels 4, 5, 6 and 7, all similar in constructiomexcept that the last two wheels 6 and 7 are made of rubber composition instead oi" an'. abrasive. rlhe wheels .are all mounted for independent vertical adjustment upon a supporting baseycomprising the longitudinal channels 7G and plate 71 (Figs. 1 and 10). rlhe wheels are carried upon the ends of the shafts 72, 73, 74 and 7 5 and such shafts are journaled inv vertically adjustable frames, such as the `:framing 76, shown in cross section in Fig. 10.- A description of ithe mounting as shown in Fig. 16 will serve for all of. the mountings. The frame 76 is lill pinned against rotation at their upper ends and extending down through the worm wheels 78, 78 swiveled upon the plate 71. These worm wheels are adapted to be rotated by means of a pair of worms carried by a transverse shaft 79, which is provided with a squared end 80 for the application of a turning lever. In this manner, the wheel may be adjusted vertically so that it engages the lower edge of the glass sheets with just the proper amount of pressure. The shaft 75 is driven from the motor 81 by means of a belt S2 (Fig. 2), and the shafts 72, 73 and 74 are driven from the shaft 75 through the intermediary of the belts 83, 84 and 85, as shown in Fig. 2, the shafts being provided with suitable pulleys over which the belts pass. The wheels 4, 5, 6 and 7 are each provided with a casing 86 having a removable cover plateI 87 and supplied with water through a connection 88. Provision is made for cleaning the casing through the opening 89 closed by the gate 90 which is hinged at 91 and held in closed position by the bolt 92. Each of the wheels 4, 5, 6 and 7 is circumferentially grooved, as f indicated at 93, the contour ot this groove corresponding to that which it is desired to give to the edges of the glass plates. In order to secure a. polishing action by the wheels 6 and 7, the casings surrounding such wheels are supplied with a mixture of water and pumice.A

The frame members 76 which carry the shafts 72, 7 3, 74 and 75 are guided and supported in their various positions of vertical adjustments by means of the triangular ' members 94, 94, spaced apart to form guidewaysfor the frame members and boltedat their lower ends to the base of the machine.

In order to st'eady the lower edges of the plates as they pass over the grooved abrading wheels, guide members 95, 95 are preferably employed (Fig. 17), such guide members being Z-shaped in cross section and secured to the frame members 96, by means of the bolts 97. These members are preferably ot rubber comlposition and either touch the sides of the g ass sheet or come closely adjacent thereto. The construction shown in Fig. 17 involves a modification of the gripping devices heretofore described in connection with Figs. 11 and 12 in that the cup shaped members 98, 98 are secured directly to brackets 99, 99 carried by the chain links 100. The springs 31 of the Fig. 12 construction are thus dispensed with, and the cup members entirely relied upon to give the necessary yielding grip and to take care of plates of varying thickness. The yielding func( ion in these cups may be augmented by making them larger in diameter and with somewhat thinner side walls. In other particulars, the construction shown in Fig. 17 is the saine as that heretofore described except that a slightly diderent means tor guiding the up per portion of the sheet is employed. The means here employed consists of a; lurality of spaced brackets 101, each of whic carries a pair of wood strips 102, 102, in which are mounted vertical pins 103. These pins carry rubber rollers 104 which engage the sidesof the glass sheet. As the glass plates emerge from the carrier chains 9 and 10, they are received upon a runway 35'L (Fig. 1) similar to the runway 35 heretofore described and illust-rated in Figs. 13 and 14, where they vare grasped by an operator and removed from the machine.

Figs. 15 and 16 illustrate a modifiedcarrier construction for glass plates, such carrier arrangement involving the use of only one chain flight instead of the two iiights of the construction heretofore described. As indicated in Fig. 16, the chain 105 is guided in-a horizontal frame member 106, the top plates 107 of the links being provided with U-shaped members 108 in which are slidably mounted the bolts 109. These bolts have transverse heads 110 and such heads are covered with rubber tubing 111. The parts 112 of the bolt isalso provided with a piece of rubber tubing 113. The bolt is pressed yieldingly to the right (Fig. 16) by means of a spring 114 lying between the member 108 and the head of the bolt. In the use of the device, the gripping devices are arranged as indicated in Fig. 15, a part of the bolts having their transverse heads 110 arranged vertically, as indicated at X-XX, while two other of the bolts have their heads arranged horizontally, as indicated at YY, the springs 114, 114 in these latter members being under compression, since the bolts have been pushed to the left, so that theglass sheet is firmly gripped at its edges between the bolts having their heads horizontal and those having their heads vertical, as indicated in Fig. 15. This method of gripping the plates requires a much larger amount of labor on the part of the operator than the arrangement of Figs. 11, 12 and 13 heretofore described due to the fact that the holdeach plate. The glass plates may, however,

be securely supported and carried in a right line by this genera-l arrangement and illustrates the possibility of accomplishing the desired result by the use of a single carrier chain 1 instead of the two chains 9 and 10 of the first form of construction.

While the machine is designed primarily for rounding the edges of glass sheets, as heretofore described, it may also be used to good advantage for beveling the edges of sheets, the same. cutting wheels being used, but only the set on one side of the sheet. being required and the members of such set all being inclined at the same angle and arranged so that they cut successively. A part ot these wheels may be composed of polishneeaeeo D ing material, and in this beveling operation, the series of circumferentially grooved grinding wheels are of course not required.

What I claim is:

l. A -mahhine for rounding the edges of glass sheets comprising, means for supporting a glass sheet and carrying it ahead, and a roughing unit in the line of travel of one of the edges of the sheet comprising a series of pairs of driven abrading wheels of cup form having the axes of rotation of each pair oppositely inclined with the planes of rotation of the wheels extending obliquely of the plane of the glass sheet, so that the cutting faces thereof Will engage the corner edges of such sheet, the axes of rotation oi' said pairs of wheels being inclined at different angles, so 'as to cut bevels from said corners l ing at different angles.

2. machine for rounding the edges of glass sheets comprising, means for supporting a glass sheet and carrying it ahead, a roughing unit in the line of travel ot one of the edges of the sheet comprising a -pair of driven abrading wheels having their axes of rotation inclined toward each other with the cutting faces of the two Wheels extending obliquely of the plane of the glass sheet, and adapted to engage the corner edges of such sheet, and a driven abrading wheel having a circumferential groove in the line of movement of the glass sheet and positioned to engage the edge thereof after it passes the roughing unit.

3. A machine for rounding the edges of glass sheets comprising, means for supporting a glass sheet and carrying it ahead, a roughing unit in the line of travel of one of the edges of the sheet comprising a pair of driven abrading wheels having their axes of rotation inclined toward each other with the cutting faces of the two wheels extending obliquely ot' the plane of the glass sheet, and adapted to engage the corner edges ot' such sheet, and a series of driven abrading Wheels each having a circumferential groove in the line of movement of the glass sheet and adapted to engage the edge thereof one after another after it passes the roughing unit.. l

4C. A machine for rounding the edges of glass sheets comprising, means for supporting a glass sheet and carrying it ahead, a roughing unit in the line of travel of one of the edges of the. sheet comprising a series of pairs of driven abrading Wheels of cup form having the axes of rotation of each pair inclined toward each other with the planes of rotation of the Wheels extending obliquely of the plane of the glass sheet so that'the cut-ting ,faces thereof will engage the corner edges of the sheet, said pairs of Wheels of cup form being inclined at ditferent angles so as to cut bevels from the eorners of the giass sheet lying at diierent angles, and a second unit comprising a series of driven surfacing wheels, each having a circumferential groove in the line of movement of the glass sheet and adapted to engage the edge thereof `one after the other after it passes the roughing unit.

5. In a machine for cutting the edges of glass sheets, a series ot driven abrading Wheels having their cutting surfaces arranged in alignment and adapted to cut the edges of the sheets carried thereover, and means for moving the sheets over the cutting surfaces of the wheels in vertical position with an edge in contact therewith, comprising a pair of endless driven carriers arranged with a flight of one carrier in opposition to that of the other and With such flights extending along the series of abrading wheels, guide means for said flights ior holding them against deiiection, and yielding clamping means upon each carrier and adapted to grip 'the sides ofthe glass sheets edtherebetween and hold such plates securely against edgewise movement as the sheets are moved over the abrading wheels.

6. In a machine for cutting the edges of glass sheets a series of driven abrading Wheels having their cutting surfaces arranged in alignment andy adapted to cut the edges of the sheets carried thereover, and.

means for moving the sheets over the cutting surfaces of the Wheels in vertical position with an edge in contact therewith, comprising a pair o'lf endless driven carriers arranged With a flight of one carrier in opposition to that of the other and with such flights extending along the series oabrading Wheels, guide means for said tiights for holding them against deflection, a runway leading between said iiights for guiding the glass sheets into position therebi'atween, and clamping upon each carrier ior engaging the glass', said clamping means being arranged to grip the glass sheets therebetween and hold them yieldingly into engagement with the abrading Wheels as they are moved past such wheels. i,

7. In a machine for cutting the edges of glass sheets, a series ot driven uhradng wheels having their cutting surfaces arranged in alignment and adaptedto cut the edges of the sheets carried thereover, and means for moving the sheets over the eutting surfaces of the wheels in vertical position with an edge in Contact therewith, comprising a pair of endless driven carriers arranged with a 'flight of one carrier in opposition to that of the other and with such flights extending along the seriesof abrading Wheels, guide means for said iights for holding them against deflection, a runway leading between said fiights for positioning the glass sheets at the proper level therebetween, aud yielding clamping means upon each carrier tor engaging the glass, said ltherebetween and to bring alignment and adapted to cut the edges of the sheets carried thereover, means for moving the sheets over the cutting surfaces of the wheels in vertical position with an ed e in contant therewith comprising Vdriven en less carrier means along the series of Wheels, and yielding clamping means'arranged to grip the sides of the sheets back from the edges to he cut andto hold such Vedges in contact with the abradin wheels, and steady means for holding the seets against lateral movement located intermediate said clamping means and the wheels.

' 9. In a machine for cutting the edgesof glass sheets, a series of driven abrading wheels adapted to cut the edges of the sheets carried thereover, means for moving the sheets over the cutting surfaces of the wheels in vertical position with an edge in contact therewith comprising driven endless carrier .means along the series of wheels, and yielding clamping means arranged to grip the sides of the sheets back from the edges to be cut and to hold such edges in contact with the abrading wheels, and steady Ameans for4 holding the sheets against lateral movement located intermediate 'said clamping means" and the wheels, said means comprising two members with yielding surfaces lying on oppositesidesyof the sheet and adjustable toward and from each other to accommodate sheets of varying thickness.

10. In a machine for cutting the edges of glass sheets,a series of driven abrading wheels adapted to cut the edges of the sheets carried thereover, Ameans for moving the sheets over the cutting surfaces of the wheels in vertical position with an edge in contact therewith comprising driven endless carrier means along the series of wheels, and yielding clamping means arranged to grip the sides of the sheets back fromthe edges to be cut and to hold such edges in contact with the abrading wheels, and steady means for holding the sheets against lateral movement located intermediate said clamping means and the wheels, said means comprising two rolls extending longitudinally of the line of movement of the sheets on opposite sides thereof and having yielding surfaces.

11. In a machine for cutting the edges of glass sheets, a series of driven abrading Wheels adapted to cut the edges of the sheets carried thereover, means for moving the sheets over the cutting surfaces of the wheels in Vertical position with an edge in contact therewith comprising driven endless carrier means along the series of wheels, and yielding clamping means arranged to grip the sides of the sheets back from the edges to becut and to hold such edges in contact with the abrading wheels, and steady means for holdingthe sheets against lateral movement located intermediate said clamping means and the Wheels, said means comprising two rolls extending longitudinally of the line of movement of the sheets on opposite sides thereof, and yieldingly pressed toward each other to accommodate sheets of varying thickness. e

l2. In a machine for rounding the edges .of glass sheets comprising, means for supporting a glass sheet and carrying it ahead, a rou hing unit in the line of travel of oneo the edges of the sheet comprising a pair of driven abrading wheels having y'their axes of rotation on opposite sides of the line of travel of the sheet and arranged so that the rotating surface of one wheel engages one corner of the edges of the sheet and the other wheel engages the other`corner `of said edge, and a driven abrading wheel having a circumferential groove in the line of movement of the glass sheet and positioned to engage the edge thereof after it passes the roughing unit.

In testimony whereof, I have hereunto subscribed my name this 3rd day of April,

WILLIAM OWEN.

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