US1713622A

US1713622A - Lens-edge-grinding machine

Info

Publication number: US1713622A
Application number: US128689A
Authority: US
Inventors: Rakel Howard
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-08-11
Filing date: 1926-08-11
Publication date: 1929-05-21
Anticipated expiration: 1946-05-21

Description

May 2'1, 1929. H. RAKEL 1,113,622

LENS EDGE GRINDING MACHINE Y Filed Allg. l1, 1926 4 Sheets-Sheet 1 Iig. L

41 4 sa se May 21, 1929.

H. IRAKEI. 1,713,622

LENS EDGE lCrRINDING MACHINE Filed Aug. 11 1926 l4 Sheets-Sheet 2 H. RAKEL LENS EDGE GRINDING MACHINE May 21, 1929.

Filed Aug. 11, 192e 4 Sheets-Sheet El l l May 2l, 1929-.

H. RAKEL LENS EDGE GRINDING MACHINE 1926 4 Sheets-Sheet VFiled Aug. vll

Patented May 2l, 1929.

UNITED sTATEs HOWARD RAKEL, oF CINCINNATI, oHIo.

LENS-EDGE-GRINDING MACHINE Application filed August 11, 1926. Serial No. 128,689.

My invention relates to improvements in lens edge grinding machines for grinding the edges of lenses and is primarily for use in grinding the edges of optical lenses.

It is the object of my invention to provideV a lens edge grinding machine capable of grinding opposite edge bevels at the opposite faces of lenses, for instance, for rim glasses or spectacles, and of grinding straight edges on lenses, for instance, for rimless glasses or spectacles; further, to provide novel means for presenting' lenses at opposite angles to the grinding face of a grinding tool; further, to provide novel means for presenting lenses substantially perpendicular to the grinding face of a grinding tool; further, to providenovel means for moving the lenses bodily lengthwise of the grinding face of a grinding tool, whereby the lenses are located in coactive relations with the grinding face during the various grindings thereof; further, to provide means for qualifying the angular positioning means for the lens, whereby to adjust the angular position at which the lens is presented to the grinding face, in order to locate the opposite bevels at the edge of the lens central with relation to the said edge; further, to provide novel means for adjusting the movements of the lens carrier for grinding lenses of various sizes; and,` further, to provide novel means' for angular presentation of the lens and for shifting the lens whereby a narrow grinding wheel may be employed for the various grinding operations.

The invention will' be further readily understood from the following description and claims, and from the drawings, in which latter:

Fig. 1 represents a front elevation improved device.

Fig. 2 represents a. plan view of the same.

Fig. 3 is a plan view of the same partly broken away and partly in horizontal section on the line 3--3 of Fig. 1. showing the parts arranged tor grinding a bevel at the edge of one .face of a lens.

Fig. 4 is a similar view showing the same arranged for grinding a bevel on the opposite face of the lens.

Fig. 5 is a longitudinal section of my improved device taken on the line 5-5 of Fig. 2.

Fig. 6 is an endview of a detail of the same partly in section on the rline 6-6 of Fig. 5.

Fig. 7

is an end elevation of my improved device partly broken away and partly in section on the line 7 7 of Fig. 1.

Fig. 8 is a sectional detail of the same taken in the plane of the'line 8-8 of Fig. 5.

Fig. 9 is a detail of the same showing the means for angular adjustment of the slide.

A support 21 shown as a base has a pedestal 22 extending upwardly therefrom, in which there are bearings 23, for a grinder shaft 24, on which a grinding tool 25, shown as a grinding wheel, is secured in suitable manner. The grinding wheel has a suitable supply of water or other lubricant thereon. The grinder shaft is arranged to be rotated from a suitable source of power and has a pulley 26 fixed thereto.

Endwise reciprocation is imparted to the `grinding wheel, as by providing a shaft 27, journaled in bearings 28 of the pedestal, and driven by means of a sprocket chain 29, received about sprocket wheels 30, 31, respectively fixed to the shafts 24, 27. A cam collar 33 is fixed to the shaft 27,y andis provided with a cam groove in which a pin 34 is received. This pin is ona lever 35, pivoted at 36 to the pedestal, and having a fork 37, prvided with pins 38, received in an annular groove 39 in the grinder shaft 24 for reciproeating the grinder shaft.

A lens carrier 41 comprises a frame 42 pivoted on a housing 43. The housing is in turn pivoted, as by pivots 44, to a slide 45, having guides 46 received in guideways 47 of a plate 48, which may be part of the support, but is preferably adjustable with relation thereto for purposes to be hereinafter described. The location of the pivots 44 is such as to normally cause tilt-ing of the rotary lens holder toward the grinding tool for coaction of the rotating lens with the grinding tool with a limited pressure to prevent chipping of the lens. Y v

A shaft 51 is journaled in bearings 52 in the housing, and lis exemplified as driven from a sprocket chain 53, received about a sprocket wheel 54 fast to the Shaft 27, and about a sprocket wheel 55 received about the shaft 51. The sprocket wheel 55 is on a collar 56 slidable endwise on and rotatable with a sleeve 57. This sleeve is provided with a collar 58 fixed thereto. A clutch 59 is located between 4the collars 56,58.

The clutch is arranged to be engaged for driving the sleeve and the shaftl 51, and is arranged to be disengaged for disengaving the driving connection of said Shaft. t:The

collar 56 is provided with a knob 60, by means of which the collar 56 1s moved manually endwise for engagement and for disengagement of the clutch. T he .collar 56 is provided with a spring finger 61, having a button G2 received in an annular groove 63 in the collar 58 when the clutch is in disengaged relation. The button 62 is received in a rabhet G4 when the clutch is in engaged relation, for aiding in maintaining said engaged relation. The sleeve 57 has spline key and groove connection G8 with the shaft 51, 'for driving the sh att 51 when the clutch is in engaged relation. Y

A bevel gear 71 has spline key and groove connection 7 2 with the shaft 51. The hub 3 of the bevel gear is ournaled in a bearing 74 of'a bracket 75 fixed to the housing 43. A bevel gear 7 6 meshes with the bevel gear .71, and is fixed to an upright shatt- 77, journaled in a bearing-73 extending from said bracket 7 5. Th Jiframe 42 is provided with a bearing 79 about the shaft 77. This bearing 1s supported on the housing 43. A bevel gear 31 is iiXed to the shaft 77, and meshes with a bevel gear 32 iixedto a shaft 33, ournaled in

bearings

84, 35, oi.l the frame 42. The

bearings

79, 84 and 85 may be located in an arm '86 of said frame.

The shaft 33 has a. bevel gear 39 fixed thereto, which meshes with a bevel gear iixed to a cross-shaft 91 journaled in bearings 92 in the frame 42. The shaft 91has gears 93. 94, fixed thereto. which respectively mesh with gears 95` 96. The gear 95 is fixed to a shaft 97 journaled in a bearing 93 in the frame 42, and held axially by a collar 99. The gear 96 has spline key and groove connection 100 with a shaft- 101 journaled in a bearing 102 of the trame 42. i

The

shafts

97, 101. have the

respective parts

105, 106, of a lens clamp lined thereto. This lens clamp may comprise cushions 107. 103, received against the respect-ive faces of the lens. exemplilied at 109, which it is desired to grind. The lens is arranged to lbe clamped in said clamp and is readily releasable therefrom.

' A lever 111 is pivoted at 112 in a fork 113` iixed to the frame and has articulation 114 with a stem 115 of a ball 116` located in a socket 117 et the shaft 101.v A cap 11S ot the socket is secured to the end etV the shaft 101 vby means of screws 119. Unscrewing the screws releases the ball. The lever 111 is provided with a. handle 120. A springl 121 is located. between the frame 42 and the outer Yend'of the lever 111 for normally urging the 4. The median position of the edge bevels at the respective faces of the lens ywhen grinding a lens for being received in a rim, and means are also provided for presenting the vlens to the grinding surface so as to grind a straight edge on said lens, for making a so-called rimless lens, and means are further provided for roving the lens holder in endwise relation to the grinding surface, for positioning the lens in similar positions lengthwise of the grinding surface during the various characters of grinding, whereby a rnarrow grinding wheel may be employed.

A cam drum 125 is journaled on

axles

120, 127` in bearings 123, 129, oi the housing 43. It is provided with a cam groove 130, provided with straight portions 131, and inclined portions 133, which connect with the respective ends ot the straight portions at opposite sides of the cam drum. There is an inclined portion 133 at each side of the cam drum, the respective inclined portions being inclined in opposite directions. The cani drum is provided with a gear 135, with which a gear 136 fixed to the shalt 51 meshes, for

rote-.tineV the cam drum.

A stem 141 is iXed in a bearing 142 on the frame 42, and is provided with aroller 143, which coacts with the cam. The stem is received in a. slot 144 in the top of the housing and in a slot 145 in a bracket 146 iixed in said housing. These slots are arcuate slots, the eurvatures of which are described from the pivotalaXis ot the frame 42. rlhe walls of these slots guide and steady the stern.V

The drum 125 rotates in the direction of the arrow a. The wall147 of the inclined portion 133 of the cam groove 130 coacts with the roller for swinging the frame 42 in one direct-ion, and the similar wall of the opposite inclined portion at the othersideof the cam drum, eoaets with said roller for swinging the 'frame 42 in the opposite direction. The swinging oi: the frame is for the purpose of presenting the respective sides or" the lens being ground in opposite angular relations to the grinding surface of the grinding wheel, so as to grind said lens with opposite edge bevels at its respective sides. The respective positions of lthe frame 42 and 'of the lens are shown in full lines in Figs. 3 and. grinding wheel is shown in these figures.

Then the frame 42 is swungtrom the position shown in Fig. 3 to the position shown in Fig. 4, or vice versa, the frame is moved equal distances and is presented at equal but opposite angles to the plane perpendicular to the axis of rotation of the grinding wheel, in which the pivotal axis of the frame-42is located. The positions of the lens are distanced from each other in these two angular positions of t-he pivoted frame.

y In order to compensate for this movement of the lens, the lens holder is moved in oppogroove.

site direction, lengthwise ofthe grindingsurface of the grinding wheel, for relocating the lens in proper grinding relation with the grinding wheel. For accomplishing this, the cam drum 125 is provided with a cam, shown as a cam groove 151, which has straight portions 152, and inclined portions 153. There is an inclined portion 153 at each side of the cam drum, the respective inclined portions beingA inclined in opposite directions. A stem 154 is xed to the plate 48, and is provided with a. roller 155 received in the cam Then the wall 156 of the inclined portion 153 coacts with the roller, the slide is moved from the position shown in Fig. 3 to the position shown in Fig. 4. When the similar wall of the opposite inclined portion of the last-named cam groove coacts with said roller, the slide is moved in the opposite direction.

The rotary lens holder rotates at greater ing a. portion of the opposite bevel at the opposite face of the lens. The grinding wheel rotates at relatively much greater speeds.

These coactive relations for grinding take place during travel of the roller 143 in the straight portions 131 of the groove 130, the slide being held endwise during such coact-ive rotations by travel ofthe roller 155 in the straight portion 152 of the groove 151. In the interims between such grindings, the roller 143 coacts with the respective inclined portions 133 of the groove 130 and the roller 155 coacts with the respective inclined portions 153 of the groove 151 for accoinplishing the shitting motions of the rotary cam drum 125, the housing 43 and frame 42.

The swinging movement of the lens during such shitting movements would normally be into the plane of the grinding surface. Means, however, are provided for moving the lens away from the grinding surface during such shifting movements, accomplished in the present exempliiieation by a cam 161, having high points 162, which coact with a stop face 163 on a stand 164. The cam 161 is on a sleeve 165, which has spline key and groove connection 166 with a shaft 167 extending from ythe cam drum. A post 168 is fixed to the plate 48, and is provided with a guide 169 which is received in an annular groove 170 in the sleeve 165 for positioning said sleeve endwise. The post is also provided with a guide 171 received in anv annular groove 172 in the sleeve 57. These guides 169 and-171 have arcuate edges, respectively preferably described from the pivotal axis of the housing 43, so as tomaintaincoactive relations between said guides and saidsleeves respectively, durin the rocking movements of the housing, w ereby such sleeves are maintained in endwise positions during endwise movements'of the slide. The

shafts

51 and 167 move endwise in said sleeves during endwise movements of said slide, the driving connections between said respective sleeves and said respective shafts being, however, maintained.

Patterns 177 rotate in unison with the rotation of the lens, for determining the shapes to which the respective lenses shall be ground. There may be a suitable number of these patterns, and the patterns be of different shapes, as will be well understood in the art. A coacting arm 178. which forms a stop, is on a slide 179, slidable in a guideway 180 on the stand 164, the slide being adjustable crosswise of said patterns, for placing the coacting arm in coactive relation with any one of the patterns desired, for determining the shape to which the lens is to be ground.. The

slide is provided With a threaded stem 181,

over which a nut 182 is threaded, for clampingthe slide in adjusted positions. The slide is provided with a pointer 183, arranged to register with any one of the indications 184 corresponding to the shapes of the patterns.

The patterns are received over a reduced end 187 of the sleeve 57, and have positioning means between said sleeve and said patterns for fixing the angular relations between said sleeve and said patterns, exemplified as lips 188 on the patterns, received in grooves in the sleeve parallel with the axis of the sleeve. The patterns are clamped on saidsleeve by a nut 189 received over the threaded end of the outer reduced portion of said sleeve.

T he lens is clamped in the rotary lens holder soV that its shape corresponds'in angular position to the angular position of the pattern corresponding with the shape desired ot' the lens. The axis of rotation of the patterns moves toward and from the arm 178 to control the movement of the -axis of rotation of the lens toward and from 'the grinding surface. The radial position of the point of contact of the pattern with its arm coincides with the radial position of the point of contact of the lens with the grinding Wheel.

Means are provided for regulating Vthe approach of the axis of rotation of the rotary lens holder toward the grinding surface, for grinding lenses of various sizes for the respective patterns. This is accomplished by adjusting the position of the arm 178, which forms a stop.v This stop is adjusted toward and from the axis of rotation of the grinder shaft for adjusting the approach of the rotary lens holder toward the Vgrinding surface. The axis of rotation of the rotary lens holder is 'permitted to approach the grinding surface closer for smaller lenses than for larger lenses.

The means thus providedalso permit adj ustment of the approach of the aXisof rotation of the lens holder toward the grinding surface during grinding-of the lenses, so as to avoid chipping.

' Thus the stand 164 is located on aslide 191, slidable in a guideway 192 on the plate L13. An adjusting screw 193 is threaded in a threaded bearing 194 in the slide, and is held in endwise position in a guide piece 195. The screw rod is provided with a knurled vhandle 196 for turning the saine. AV nut 197 is threaded on the screw, and is provided with

pointers

198, 199, on a stem, rigidly connected with the nut, and extending through a slot 201 in said guide piece. VThe pointers register respectively with the graduations of

scales

202, 203. The scale 202 is for the purposevof adjustment for lenses being ground with bevel edges, and the scale 203 is for lenses being ground with straight edges.

The stop 178 is so adjusted that the rough edge of the lens makes contact with the grinding surface, and, as the edge is ground down, the slide 191 and the stop are adjusted toward the plane of the grinding surface, permitting further approach of the lens holder toward the grinding surface. The limit of Vapproach oflthe rotary lens holder toward the grinding surface is determined by the correspondence of the gage linger with the desired graduation of its scale. rhese coactive relations between the lens and the grinding surface are maintained during the time that the roller V1413 coacts with the straight portions 131, of the cam 130, during which times the cam disk 161 is out of coactive relation with its coacting face 163. As the roller 143 enters either one of the slanting portions 133, ofthe cam 130, one of the highspoints 162 of the cam disk 161v coacts fith the coacting face 163, for causing recession of the housing 13and of the rotary lens holder away from the grinding surface, so that the lens is out of contact Yith the grinding surface during the swinging movements of the lens holder. When theroller 143 enters the opposite straight portion lof the carin 130, the high point 162, of the cam coacting with the face 163, will have passed such face, for again placing the pattern in coactive relation with the stop 178, for grinding a portion of the opposite bevel on the edge of the lens.

Then lenses are ground with sn'aiglit edges, as. for rimless spectacles, the rotary lens holder positioned with its axis of rotation parallel with the grinding surface, and is held stationarily in this position. rlhe slide 45 is also held in stationary position. These positions are intermediate of the limits of swinging movements of the lens holder and the limits of sliding movements of the slide.

For accomplishing this each of the inclined portions of the cams is provided with an etlset. Theseoffs'ets in the inclined portions 133 of the cam 130 shown as recesses 2011, and in the inclined portions 1537of the cam 151 are shown as recesses 205.v The roller A3 is received in one of the recesses 2011 for positioning the lens frame d'2. rllie rollerl is received in one of the recesses 205 for positioning the slide 4:5 at an intermediate position. The axle of the cam drum is provided with a knob 206, having opposite m -rs thereon, either oi" .vhich is arranged 'to reg-` ister with a mark 20S on the housing, during rotation of the housing in its driven direction,'for indicating Coincidence in annular direction et veen the roller and either of the recesses 204;, and betw yn the roller 155 and either the recess-es 205. Rotation of the knob and cani drum in the opposite direction, that is, clockwise direction looking at the knob and indicator marks, causes the walls of the recesses to be received about the rollers, for fixing the slide at an intermediate position in endwise relation, and lixing the pivoted frame in an intermediate end 7isc position, with the axis of rotation of the rotary lens holder parallel with the grinding surface.

This manipulation of the cam drum preferably takes place while the driving lmeans I for the cam drum are dissociated therefrom.

' his dissociation n'iay be eli'ected byrnalring the shaft 51 longitudinally slidable in its rings and in the sleeve 57, for moving the r 130 endwise out of mesh with the gear The spline key and groove connection maintains driving relation between said shaft and bevel gear 71. y

'lhe shaft is positioned endwise in spective positions by being provided

annular grooves

211, 212, an nroviding 213 aiia i. .th a pin movable in a lug ...il on the nousing and in ertable in either of the grooves. The outer end of the shaft is provided with a knob 215 for moving the shaft endwise. lllhen the pin is in Vthe annular groove 211 the gear 136 is in mesh with the gear 135, and when thepin is in the annular groove 212, the said gears are out of'inesh.

Placing the gear 13bV out of mesh with the gear 135, causes the cam drum to remain nourotative, thereby placing vthe cam disk 161 into noirrotative relation and in non-interfering position with 'relation to the stop ce 163. "he function el this cani is unnecessary when grinding straight edges on lenses, swinging movement of the frame 412 does not then Atake place. The approach adjustment between the rotary lensholder and the grinding surface by means of the coaction between one of the patterns and the stop 173 is determined by adjustment of the pointer 198 with relation to the gage 202, when grinding'straight edges or rimless lenses.

CII

llt)

During such times as approach between the rotary lens holder and the grinding surface is unnecessary or undesirable, vas when inserting the lens or when the machine is inactive, it is desirable to swingthe housing away from the grinding surface and lock the same in such position. This is accomplished by means of a latch 218, pivoted to the housing, and arranged to be received in a keeper 219 fixed to the slide.

The relation between the slide 45, the pivoted frame 42, the lens clamp, and the axis of rotation of the rotary lens holder, is preferably such, that the bevels ground at thc respective faces of the lens are normally equal, which is a proper relation when grinding lenses, the respective faces of which are parallel, or are of substantially equal curvatures inopposite directions, for instance, double convex lenses and double concave lenses. The bevels are formed equal at both faces of such lenses by opposite positions of the frame 42 at equal angles to a central plane perpendicular to the grinding surface, the apex between such bevels being in the middle of the edge of the lens.

I have found that by qualifying such swinging movements of the rotary lens holder and frame 42, I am enabled to locate the apex between the bevels at the respective sides of lenses having curvatures in similar directions, in a middle position between said faces, for instance when grinding meniscus lenses.

i I accomplish this qualification in the present instance by shifting the direction of movement of the slide 45, whereby the median plane between the limits of swinging movements of the frame 42 is placed at an angle to a plane perpendicular to the grinding surface, for positioning one face of the lens at `a greater angle to the grindingl surface than the other face thereof. The extent of this shifting movement is determined by the extent of curvature of the edge portion of the lens,

This is accomplished in the present instance by pivoting theplate 48, as by a pivot pin 221, on the base. VAn adjusting screw 222 is journaled and held endwise in a bearing 223 in the base, and is threaded in a. slide 224, slidable in a guideway 225 in the base. The slideis provided with a roller 226, pivoted on a pin 227 on the slide, the roller coacting with the Walls of a slot 228 formed in the lower face of the plate 48. Thisslot is preferably inclined, so that its relation to the pivot 221 and the direction of movement of the plate 48 are such as to permitminute adjustments. The adjusting screw is provided with a knob 229, having indications of a scale 230 thereon, which register with a mark 231 on the base.

' My improved device provides means whereby opposite edge bevels are provided on the f lens, with the apex of the bevels in the middlev of the respective opposite faces of the lens adjacent to said edge, whether such opposite faces be parallel, or of opposite concave curvatures, or opposite convex curvatures, or whether such opposite faces be curvatures in similar directions, so that tall charactersof rim lenses may be ground, and my improved machine is also capable of grinding straight edge lenses, and of grinding all such lenses of desirable shapes and sizes.

v Having thusr'ully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a-.lens edge grindin machine, the combination with the grinding tool, of a rotary lens holder, means for presenting the axis of rotation of said lens holder successively'at reverse angles to the grinding face of said grinding tool, saidmeans comprising a cam including an interruption and a coacting part coacting with said cam, and means for locating said coacting part in saidinterruption whereby to maintain said axis of said lens holder substantially parallel with said grinding face of the grinding tool.

2. In va lens edge grinding machine, the

combination with the grinding tool, of a rotary lens holder, a rotary cam and acoacting part relatively movable for shifting said lens holder to opposite angles with relation to the grinding surface of the grinding tool for presenting its axis of rotation at opposite angles to said grinding surface, and a rotary cam and coacting part relatively movable for moving said lens holder: lengthwise of the grinding face kof the grinding tool for repositioning said lens holder in substantially the same relations lengthwise of said grinding face at both said angular positions.

3. In a lens edge grinding machine, `the combination with the grinding tool, of a rotary lens holder, a rotary cam and a coactin part relatively movable for shifting sai lens holder to opposite angles with relation to the grinding surface of the grinding tool for presenting its axis of rotation at opposite angles to said grinding surface, and a rotary cam and coacting part` relatively movable for moving said lens holder lengthwise of the grinding face of the grinding tool' for repositioning said lens holder in substantially the same relations lengthwise of said grinding face at both said angular positions, and means locking said respective coacting parts to said respective cams. v

4. In aflens edge grinding machine, the combination with` a rotary grinding tool', o'f a rotary lens holder, a rotary cam and coacting part relatively movable for shifting` said lens holder to opposite angles with relation to the grinding surface of the grinding tool for presenting its axis of rotation at opposite angles to said grinding surface, a rotary cam and coacting part relatively movable for Inoving said lens holder lengthwise of the grrnding face of the grinding tool for reposltionmg said lens holder in substantially the same relations lengthwise of said grinding face at both said angular positions and means for adjusting'the angles ot' the axes of rotation or said cams with relation to the axis oi rotation of said rotary grinding tool for qualifying said angles ofvpresentation.

5. In a lens edge grinding machine,'tlie combination of a support, a slide thereon, a rotary lens holder having a pivot on said slide, a stein extending therefrom, a rotatable cam on said slide coacting with said stein for Y auton'iatically shifting said lens holdei on tool. Y

7. In a lens edge grinding machine, theV said pivot to opposite angles with relation Y to the grinding face oi. grinding tool, means automatically shifting said slide on said support lengthwise of said grinding face for locating said lons holder lengthwise at substantially similar positions with relation to said grinding face during the respective angular positions oit said lens holder for grinding opposite edge-bevels at the respective faces of the lens, said cam provided with an interruption, andV ine-'ans tor positioning said stein in said interruption 'whereby to interchangeably maintainV said lens holder at an iiiteiinediate position on its pivot for presenting the ar-:is of rotation of said llens holder substantially parallel with said grinding face. Y

6. In a lens edge grinding machine, the combination with a rotary grinding tool, of a base, a support thereon, a slide on said support, .said support and said slide provided with coinplemental guidingfaces extending lengthwise of the grinding face of said grinding tool, a housing having a pivot on said slide, a lens holder, a frame therefor having a pivot on said housing, means for rotating said lens holder, a rotary cam on said housing having an axis of rotation extending lengthwise of said slide, gearing for rotating said lens holder and said cani, said gearing rotating saidlens holder at greater speeds than the speeds of rotation of said cani, said frame having a coacting part coacting with said cani for shifting said frame on its pivot whereby to swing said frame for presenting the aXis'o rotation of said lens holder at opposite angles to the grinding ace of the grinding tool for grinding opposite edgebevels at the respective faces of the lens, and means whereby to angularly adjust said support on said base to adjust the angular'relation of said guidingffaces withrelation to the axis of rotation of said rotary grinding l combination with a rotary grinding tool, oli

a base, a-support thereon, a slide on said support, said support and said slide provided with complemental guiding faces extending lengthwise of the grinding face of said grinding tool, a housing having a pivot on said slide, a lens holder, a frame therefor Lviaeae having a pivot on -said housing, means for rotatingsaid lens holder,a rotary cani on said housing having anaXis of rotation eX- tending lengthwise of said slide, gearing for rotating said lens holder and said cam, said gearing rotating said lens holder at greater speeds than the speeds of rotation of said cani, said traine having a part coacting with said cani for shifting .said frame on its pivot whereby to swing said frame for presenting theaXis of rotation of said lens holder at opposite angles to the grinding 'face of the grinding tool for grinding opposite edge bevels at the respective faces of' the lens, pivoting means for pivoting said support to said base, and adjusting means between said supportand said base for adjusting said supportoii said base, said usting means coinprising a pin and a compleinental slot, said slot extending transverse to an arc in which said pin is located and which has the pivotal axis of said pivoting means as its center.

Vsaid housing, gearing on said housing and said trame for rotating said lens holder, said frame having a. part coacting with said cani drum for shitting said frame for presentation of said lens holder at opposite angles to the grinding face of a grinding tool, means between said support and said cam drum Jfor shifting said slide lengthwise of the axis of rotation of said cam drum for repositioning said lens holder endwise with relation to said grinding face, 'means controlling the pivotal movements ol said housing, and means ior adjusting said last-named means.

9. In a lens edge grinding machine, the combination ot' a support, a. slide thereon, a housing pivoted to said slide, a cain drum journaled on said housing, a rotary lens holder, a frame therefor having a pivot on said housing, gearing on said housing and said frame for rotating said lens holder, said frame having a part coacting with said cam drum for shifting said frame for presentation of said lens holder at opposite angles to the grinding face of a grinding toolineans between said support and saidcan'i drum for shifting said slide lengthwise of the a-Xis of rotation of said cani drum for repositioning said lens holder eiidwise with relation to said grinding ace,nieans controlling the pivotal movement of said housing, means for adjustingv said last-named means, and means between said support and said slide for adjusting the path of movement of said slide.

l0. In a lens edge grinding machine, the combination with the grinding tool, of a support, a slide thereon, a housing pivoted on said slide, a rotary cani on said housing, a frame pivoted on said housing, a rotary lens holder d. ln a lens edge grinding machine, theV on said frame, a shaft on said housing parallel with said cam, driving means between said shaft and said cam, means interrupting said driving means, patterns rotatively fixed to said shaft, gearing between said shaft and said rotary lensholder causing coincidence of rotation between said patterns and said lens holder, means coacting with said respective patterns for controlling the pivotal movements of said housing, and means between said frame and said cam and between said support and said cam for swinging said fra-me on said housing and shifting said slide lengthwise of said support.

11. In a lens edge grinding machine, the combination with the grinding tool, of a support, a slide thereon, a housing pivoted on said slide, a rotary cam on said housing, a frame pivoted on sai-d housing, a rotary lens holder on said frame, a shaft on said housing parallel with said cam, driving means between said shaft and said cam, patterns rotatively fixed to said shaft, gearing between said shaft and said rotary lens holder causing coincidence of rotation between said patterns and said lens holder, means coacting with said respective patterns for controlling` the pivotal movements of sai-d housing, means between said frame and said cam and between said support and said cam for swinging said frame on said housing and shifting sai-d slide lengthwise of said support, and means interchangeably operable to maintain said slide at an intermediate position.

12. In a lens edge grinding machine, the combination with the grinding tool, of a support, a slide thereon, a housing pivoted on said slide, a rotary cam on said housing, a

frame pivoted on said housing, a rotarylens holder on said frame, a shaft on said housing parallel with said cam, driving means between said shaft and said cam, patterns rotatively fixed to said shaft, gearing between said shaft and said rotary lens holder causing coincidence of rotation between said patterns and said lens holder, means coacting with said respective patterns for controlling the pivotal movement of said housing, means between said frame and said cam and between said support and said cam for Swingin said frame on said housing and shifting sai slide lengthwise of said support, and means automatically moving said housing away from said gringing face during swinging movements of said frame.

13. In a lens edge grinding machine, the combination of a support, a housing pivoted thereto, a cam drum journaled in said housing, a shaft journaled in said housing, gearing between said shaft and said cam drum, means causing interruption in the drive relation of said gearing, a rotarylens holder, gearing between said shaft and said rotary lens holder for driving the latter, a sleeve about said shaft, patterns secured to saidv sleeve, driving means forsaid sleeve, interrupt-ing means for said driving means, means between said cam drum y'and said rotary lens holder for automatically swinging said rotary lens holder in opposite directions, and means between said rotary lens holder and said cam drum interchangeably operable to hold said frame at an intermediate position.

In testimony whereof, I have hereuto signed my name.

HOWARD RAKEL.