US939975A - Lens-grinding machine. - Google Patents

Description

P. BUCHHOP. ,LENS GRINDING- MACHINE. APPLIGATION FILED DBO. 1a, 190e.

939,975.v Patented Nov. 16, 1909 oiisly without in grinding a single lens.

FERDINAND BUCHHCE, OF NBV! YORK, N. Y., SS-IGNOR TO THE MEYROWITZ MANU- FACTURING COMPANY, A CORPORA LENSGRINDING IIIACHINE.

To uit ilm/a it mu/y concern.'

lle it known that l, FERDINAND Buoiiiioi,

a citizen of the United States, residing at the city of New York, iii the borough of Broollyii and State of New York, iave invented f certain new and liiseful liiipioveinents in Leiistrinding Machines, of which the following is a full, clear, and exact description. My invention relates to lens grinding mal chines of the general typo forth in m prior application Serial No. 441,996, filed,l July G, Y1908, and which is adapted for all classes of' lens grinding. g The present invention is designed excliil sively for torio and cylindrical grinding, and l includes means whereby four or any lessll number of lensesiinay be ground simultanei requiring substantially any' more mechanism than is ordinarily employed .ln this action the i l l ,l

various lenses receive an individual pressure suitable to their separate needs and are individually acted upon in substantially the saine Way as if they were ground separately. Means are also provided whereby any number of the separate lens grinding` devices may be thrown out of' action individually so that the machine operates on one, two or three lenses in the absence of the full number, without any disturbance or interference t'roin the idle parts of the mechanism.

The invention consists in the features of construction and combination hereinafter setforth and claimed.

In the draivin 'sz Figure l is a vertical sectional view o a. lens grinding machine embodying the principles of my invention; Fig. 2 is a section on the line ll-ll of Fig. 1; F ig. 3 is a plan View of the carrier for the work holders; Fig. 4 is a detail View of one of the Work-holdin' spindles; Fig. 5 is a plan view of a Work-holder; Fig. 6 is a plan view of the jtool-holder and its associated parts; Fig. 7 shows a slight modification of the same, and Fig. 8 shows a Worlecarrier adapted to the tool-holder shown in Fig. 7.

In grinding cylindrical and torio lenses, a tool having a surface corresponding to 'the surface to be ground is reciprocated in onedirection While the lens blank, liXed on a suitable Workfholder, is reciprocated at right angles to the ath of movement of the tool.

.Specification of Letters Patent.

Application filed December 16, 1908.

The lens blan should be capablejof tilting freely in all directions and also yielding ver- TION OF NEW' JERSEY.

Fateiited Nov. i6, 1909. ser-iai No. 467,811.

fically up and down so as to follow the Curvature of the tool in its movement. In orj dinary practice holders are mounted tions, but so far Iam aware the grinding individual tools and Workto satisfy these condiof a plurality of cylindrical or torio lenses simultaneously by a single operating mechanism, has not been accomplished. I have provided a construction having a carrier frame with separate work-holding spindles which are mounted to accomplish the various functions mentioned.

l denotesa table which constitutes a supporting traine for the various mechanisms.

2 and 3 which may be designate shafts which rotate oii vertical axes ivd ing the driving shaft' and having hin the table, the shaft 2 bcpulleys 4 pul- 'lhe shaft G on its upper end table l, which serves to reciprocate the cross-head 7 guided on fixed rods 8, by tion 9.

l designates means of a pitman conneca freely swinging arm fulcruiiied oii the crosshead and extending for- The grinding .y ivardly to support the work-holders.

tools or heads l2 are fixed in a pan 13 which has integral lugs 14 on its bottom face transversely recessed lo be slidahly received on a pair of fixed rods l5. The pan 13 is reciprocated on these rods in a path at right. of the Work by a crank disk the shaft 3.

l have shown tivo and four tools,

Within the pan toric lenses.

angles to the reciprocafion a pifman connection 16 from 17, fixed to the upper end of' tivo constructions in which 13. These tools are of' the grinding cylindrical and reciprocating rod or arm of the Work carrier has a socket 20 in which is received a stein 21 which projects rigidly from an H-shaped frame 22, the

extremities of the arms of which are vertically recessed With square holes 23, 'to receive the'work spindles. Each work spindle comprises a rod 25 with a square portion 26 adapted to beA relation.

27 denotes av spindle 25 and square portion i received in th 23 in vertically slidable but e square poles non-rota able colla-r Whichvsurroiinds the is undercut to receive the thereof, and which constirespectively, are fixed j screws 30.

tutes an abutment for a spring 28 which l bears against an adjustable collar 29 tixed l on the spindle 25. t 30 designates Weights which may be socketed on the upper ends of the spindles and fixed in position thereon by the thumb The lower ends' of the spindles are rounded into a spherical or ball shape 31 and lhave y a transverse pin 32 which cooperates With a i work-holder 33v ot' the ordinary ,sort having a transverse slot 33 and a central cavity Bat. This work holder is adapted to be soeketed on the lower ends ot the spindles so as to have a universal or tilting action in any direction. Abut constrained against angular movement in a horizontal plane. "lhe tool spindles are guided in the various cavities 21) ot' the Work carrier and are capable of yielding and moving vertically independent o't'- one another. Ilach Work-l1older is also capable of freely tilting in any direction independently or' the other Work-holders.

ln use the lens grindii'ig tools are each rigidly fixedto the. panland reciproeated in one direction while the work carrier is i reciprocated in another direction at right angles to the first. `he curvature and rlunfacter ot' the' various tools may dit'- ler ividely, but each. lens blank follows the surface oi: the tool hy a proper movement exadly the same as it' each were ground by airintlividiIal carrier and pitman connection. llarh lens blank is pressed on the tool by its own individual weights, and as the weights on the spindles are entirely sepa,- rate from one another they may have any independent vertical' movement macasionedl by the varying rharauteristits ol the tools employed. i

Where only two lenses are being ground l at the same time, it is possible to employ a worh carrier o1c the ,Form shown in Fig. H, which consists oli an arm -t pivoted on a central support. vllt. In thisease the work holding 4spindles may be fixed to the extremities o'l the arm. the latter having a sort ot equalizing lever action whirh keeps both lens blanksproperly pressed against their,` tools during the ;rindin;, action. .\ny number oll lenses less than the. liull number V may` however, he ground by the nnfchanism irst described, by simply removing the lead f weights lt) ol'. the idle spindles. linder these p circumstances the idle spindles are raised; entirely clear ol" the pan lll or any tool which may he fixed thereto by their springs 28 which are strong enough to overcome the weight of the spindles alone, although overcome and depressed Whenever the Weight is applied, by virtue of the' preponderating pressure thereof.

' What I claim, is:

l. In a lens grinding` machine, a plurality of rigidly connected tools guided to reeiprocate in a fixed path, a Work-carrier movable across the path of movement of said tools, a plurality of work-holding spindles, and yielding means for deln'essing said spindles independently in said carrier.

2. In a lens grinding machine, a plurality* ol' rigidly connected tools guided terre'ciprocate in a lixed path, a carrier having a plurality of arms projecting therefrom, work-V holding spindles vertically depressible in the extremities of said arms, and independent means for bearing said spindles downward.

l 3. In a lens grinding machine, a plurality of rigidly connected tools guided to reciprocate in a fixed path, a work-carrier.' movable in a rectilinear path transverse to the path of said reci proeation, said work-carrier having a plurality ot' arms with vertical hdles ot' non-circular transverse section, a plurality oi yspindles slidaloly guided in said holes, and means for equally and independently depressing said spindles.

4. In a lens grinding machine, a plurality of rigidly connected tools guided to reciprocate in a fixed path, a wm'k-(alrrier n'iovahle in a rectilinear path transverse to the path ot said reciprocation, said work-carrier having a plurality of arms with vertical holes ot non-circular transwrse cross section. a plurality ol spindles slidahly gnit'led in said holes, spril'lgs -for elevating the spindles, and weights ola t'oree preponderating over said springs to f lepress the spindles when desired, i

5. In a Alens jrinding machine. a plurality ot rigidly connected tools `'uided to reeipro4 ente in a lived path. a \\'orl\'rarrier having a pair ol' equal arms pivoled thereto to constitute an edualizingI levern and work-l'lolding spindles supported at tluaextremilies ol' said arms. y

ln \\'itness whereol, l subscribe nresignature, in the presence nl' t'wo \\v'itnesses.

FERDINAND llllttlllltl.

.,\\"ilnesses: y

Wal'. M. i'rooumumin,

Wahoo M. (lnAmN.

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