US1474171A - Lens-edging machine - Google Patents

Description

Nov. 13, 11923.

R. SCHUMANN mans EDGING MACHINE Filed March 5. 1921 2 Sheets-Sheet l J72 778M f0?" W M R. SCHUMANN LENS EDGING MACHINE Nov. 13, 1923. 3,474,171

Filed March 5. 1921 2 Sheets-Sheet 2 76 1? 16 Q as Parr/14m Len- Patented Nov. 13, 1 923.

i UNITED eereier ROBERT SCHUIVIANIQF, OIE DUSSELDORF, GERMANY:

LENS-EDC-ING MAGHIIIE.

Application filed March 3, 1921.

To all whom it may concern Be it known that 1, ROBERT Sorrmmrm, a citizen oi the German Republic and residing at Dusseldorf, Germany, have invented certain new and useful improvements in lidging lVIachines, oi which the following is :ispecification.

The present invention has refer enro to im provements in. copying lens edging machines with relative axial reciprocation of the work spindle for varying the grinding zones, and it relates more particularly to improved pat tern disc means in association with the work spindle, and in. connection therewith to means for controlling the extent of the reciprocatory displacement of the work spindle with respect to the grinding tool.

My improved edging machine permits of turning out lenses of varying shapes and sizes without any interchange of machine parts, simply by shifting the circumfer ontially grooved contact roller to selectively coact with any one of aseries of pattern discs and size or the lenses determining the shape to be ground. These pattern oiscs form a fixed part of the machine and are thus not subject to misplacement or loss. The positivecontrol of the. reciprocetions 01": the work spindle: allows of a. number of lenses being operated on simultaneously without danger of having the respectively outermost lenses carried beyond the allotted grinding zone when they would not be acted upon any longer by the tool and. would he apt to be injured on leaving and again on entering the grinding zone. This control feature also assures an. even wearing down of the grind.- ing tool.

In the accompanying drawing a con structional form of the grinding machine according'to the present invention isshown by way of example.

Fig. 1 is e side. elevation, Fig. 2 isa. plan, and Fig. 3 is a. front elevation of the machine. Figs. 4: and" dare sectional views on thelinesA-B and C.-D, respectively. Fig. 6 is an individualpart. Figs. 7 and 8 illustrazte a modification ofan individual part.

011 the-bed. 1 is journelled in bearingsfi a. shaft 2 carrying a grinding wheel 4 and a. driving pulley 90. i The bed is provided with prismaticv ways 5', on which is guided it slide 6, having screws 7 and glatesS for securing said slide toits ways. i n this slide 10 is revolubly and axially shittab-ly Serial No. 449,279.

journalled. To the shaft 10 is fixed ugrooved cem-wheel 13, in which engages a. pin 14, which projects shittebly through a. slot 63 in a. plate 15. The said plate 15 is fitted to the slide 6 and carries, supported thereon by means of pins 91 a yoke 66, which drawn downwards by means of a spring 65, whilst :i set-screw 6i, screwed into the top of the yoke beers on the plate 15. Thus it possible to determine the relative posi tion between the yoke and the said plate hy means of said set-screw. lit the one bearing 9 is journelled a bevel-gear at? through which the shaft 10 passes, Which here carries .1 key, by means of which the shaft is dogged when the bevel-gear revolves. The bevelgem. t? meshes with another bevel-gear 17 which is attached to the one half of a clutch 52, while the other half of the clutch 52 shitttably fitted on the shaft 59 of the bevelgesr 47: Into an annular groove in this clutch-member engages 1 forked lever 58, the shaft of which 56 is coupled to a lever 57 and turned by means of a. spring fitted to it, in such a. manner, that the clutchmember 52 tends to engage in the clutchmemher 52. To shaft 59 is fitted a wormwheel 46, in which engages a. worm 46, which is fitted to the shaft 2.

0n shaft 10 is movably fitted a long; sleeve 11, to which bearings 16, 24: are attached by means of brackets 12. In the bearings 16 is revoluhly journalled a shaft 17, which carries at one end a. plate 18 with a. rubber facing 19. To the shaft 17 are further fitted several pattern disc 32 the circumferential contours of which correspond to the circum- :terential contours of the lenses to be ground. A. gear-wheel 51 fitted to shazft 17 engages in another geanwheel 56 on shaft 10. live hub of the gear-wheel is held in the bore which engages in a. groove 93 in the said.

hub. A. screw 87 in the wheel 51 engages in a. longitudinal groove 89 in shaft 17, so that when the said gearwheel revolves, it will carry the shaft with it; To the outer end of shaft 17 is fitted an arm 73, in the bore of which is placed a spring 84, which bears at one end against collar 81 on shaft 17; and, at the other end, against a flange of the bore.

Coexielly with theshaft 17's shaiEtQT is journslled in the bearing 24, carrying a plate 25 with a rubber facing 26 at its one end. To this shaft is fitted ii geai wheel 71, which, by

hub of the gear- Pool . springs 83,

means of a pin the, bore.

a small handwheel 79.

92 is held in a groove 94in the bearing A screw 88 in the hub of the gear wheel engages in a longitudinal groove 90 in shaft '27., and to the-outer end of the same is'iitted an arm 74, in the bore of which spring 83 is disposed, which, at one end, bears against a collarBQ on shaft 27, and, at the other end, against a vflange S6 in Also this gear-wheel 71 meshes with a gear-wheel'iQ on shaft 10.

From the bearings 16 and are branched oil" arms 77 and T8, in which two shafts 75 and 76 are journalled, of which the ends turned towards each other are threaded in an opposite sense, and on tiie one end is screwed a threaded sleeve 80, which is held between the arms 77 and 78, and which is fitted with The outer ends of the shafts 75 and "Z6 are coupled to the arms 73 and Tl.

To the sleeve 11 is fitted an arm 23 carrying a weight 23.

On the slide 6 a shaft 36 is journalled in eyes 37, and on said shaft is fitted a rocker 35, which is forked at its upper end. In this fork a. shaft 3a with a loose roller33 is journalled. The rocker has an arm 39, which bears with a pin 38 against a nut ll) on a screw ll in the slide (5.

To the sleeve 11 is further fitted by means of an car 43 a pin as which can engage in a notch l l in a lever 45, which is pivoted on slide 6 and is provided with a handle The sleeve 11 further has a cam 62 on which the lever 57 bears.

, The belt 90 will revolve the grinding wheel at a high speed and by means of the gears 46, 456 the shaft 59 and the wheels 47, 47 he shaft 10 at a slow speed. Tae glass or the glasses to be ground are clamped between the plates 18, 25. This clamping is effected by turning the sleeve 80 and thereby moving the shafts 17, 27 apart by aid of arms 73, 'Zl, then the glass or the glasses are inserted between them and the sleeve is turned in the opposite sense, so that the rubber pads 19, 26 clamp them. The 84; prevent an excessive pressure being exerted, as the arms 73, M will shift on the shafts 17, 27 when the said springs are tightened. During the clamping of the glasses the sleeve 11 and all parts connected to it are held lifted 0d the grinding wheel by means of the pin engaging in the notch l l. As soon as, now the handle 4&5 is lifted, the notch l4 releases the pin 43 and the weight 23? will pull the clamped glass against the grinding wheel, against which it, however,

can only hear as far as the roller 33 will admit. Thelatter has previously, been shifted so that a templet-disc 3:2 bears against it, which corresponds in form to the shape the glass is to receive. The roller will thus hold the glasscarrier in such a position that the glass will recedefrom the grinding wheel the grinding wheel provision according to the shape of the tei'nplet-disc. The glass will, therefore, be groundto correspondto the said teinplet-dise. -11). order that the glass does not wear any grooves into has been made for the glass to travel across the face of said wheel, the cam-sleeve l3 shifting the pin The travel of this pin is limited. by the yoke (56. As soon as, therefore, the pin abuts against theone side of the yoke,'th e cam wheel 13 will, on revolving shift its position, and the shaft 10 with sleeve 11 and its parts,

thus also theglass with, it. By vertically yokei'ce by means of the spring displacing the he available length 35 and the set-screw (3+1: of the slot is varied' If the available length of the slot is equal'to or greater than the whole stroke of the cam-wheel, onlythe pin 14;, and not the shaft 10 will shi The more, therefore the y olieis lifted, the shorter will be the available length of the slot 63 and the greater will be the displacement of the shaft 10. The more glasses are ground at one time, the smaller the displacement of the shaft 10 will have to be. When the grinding operation has been completed the shafts 17, 27 "with the other parts are turned off, until pin e13 engagesin notch a l. Thereby the cam 62 turns the lever 57, which effects the release of the shiftable clutch-member 52.

In the modification according to Figs. 7 and 8 a lever 68 is horizontally disposed on the slide 6, and carries a pin 1%. On the slide 6 is fitted a smaller slide 70, which has an angular groove 71, into which the pin 14: engages. The slide may be shifted by means of a screw 69. According to the position of the slide 70, thus also of the groove 71 to the pin 14, the lateral play of thelatter will be limited. The result is, thus, the same as described above.

I claim:

1. In a lens edging" machine of the character set forth, in combination with a stationary rotatable grinding tool, a

support, a slide mounted on said support rocating saidcarriage to carry said work rotatable" shaft spindles jointly in the same sense-across the edge face of said grinding tool, and means for controlling the extent of such reciprocation of said carriage. g Y

2. In a lens edging machine. of the character set forth, incom'bination with a.

stationary rotatable grinding tool, work clamping means including a driven shaft,

means ior imparting relative lateral reciprocation between said grinding tool and said work clamping means and means for controlling the amplitude of such reciprocation to keep it within the operative width of the grinding tool, comprising a grooved cam disc fixed on said driven shaft, a fixed bearing member presenting a trans verse slot, a vertically adjustable yoke presenting a substantially triangular cutout, and means altering the position of said yoke relative to said bearing member for controlling; the operative length of said transverse slot, and a pin slidably mounted.

within said slot and its free end extending into the groove of said cam disc.

In a lens edging machine of the character set forth, in combination, a rotatable grinding tool, a relatively reciprocable and tiltable work support, including a work spindle, a series of pattern discs fixed on said Work spindle, means normally holding said work spindle in operative position, means for temporarily retaining said work spindle in inoperative position, a contact roller adapted to be brought into selected cooperation with any one of said pattern discs, means for keeping said roller in operative contact with the selected pattern disc, and means for causing said contact roller to partake of the reciprocation" of said work support.

a. In a lens edging machine of the character set forth, a work clamping instrumentality, comprising two axially alined wor: splndles, means for rotating these spindles in unison, means for axially (he- 7 placing said spindles in opposite directions,

comprising for each spindle an arm journaling the outer end of the respective spindle and the other arm end fixed to a screw spindle extending parallel to the work spindle and presenting an outer thread, the outer threads of said two screw spindles running in pposite directions, a sleeve presenting corresponding right and left inner threads adapted for cooperation with said screw spindle threads, and means for rotating said sleeve in opposite directions; and cushionin means interposed between the outer ends or said WOlC spindles and the respective journal ends of said arms.

In testimony whereof I affix my signature.

ROBERT SCHUMANN.

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