US938459A - Lens-grinding machine. - Google Patents

Description

F. BUCHHOP.

LENS GRINDING MACHINE.

APPLICATION FILED JULY 6, 1908.

' Patented N0v. 2,1909.

a" SHEETS-SHEET 1[ P. BUCHHOP.

LENS GRINDING MACHINE. APPLICATION FILED JULY e, 1908.

Patented Nov. 2, 1909.

'3 SHEETS-SHEET 2.

F. BUGHHOP.

LENS GRINDING MACHINE.

APPLICATION FILED JULY 6, 1908.

3 SHEETS-SHEET 3.

Patented Nov. 2, 1909.

which the ad uStmcntS for difierent kinds UNTTED STATES PATENT @FFICE.

FERDINAND BUTCHHOP, or new rnorumns comrany, A CORPORATION or NEW JERSEY.

LENS-G313! DING MAGHINE.

PatentedNov. 2, race.

Application filed July s, 1908. Serial No. 441,976.

93 ,459, Specification of Letters Patent.

To all whom it may concern: h view of the grinding tool spindle and an Be it known that l, FERDINAND BUoHHoP, i attachment which I apply. thereto for grinda citizen of the United States, residing at i ing toric lenses. Fig. 6 is a plan view of the the city of New Yor in the borough of same. F ig. 7 is an enlarged detail sectional Brooklyn and State of New York, have in I view of a lens holding'tool. vented certain new and useful Improvements Referring to the drawings, in which like in Lens-Grinding Machines, of which the parts are designated by the same reference sign, 1 indicates the frame of the machine following is a full, clear, and exactdescription. preferably of generally rectangular outline My invention relates to lens grinding mawith a flat top or table portion 2 through chines, and consists particularly in a com-l which the various grinding heads or spindles project. This table also carries workplete organized machine adapted to grind supporting devices by which the lenses are a number of lenses simultaneously.

It is a particular purpose of my invenheld against the grinding tools and proption to provide means by which lenses of erly moved or manipulated during thegrindevery ordinary character, either spherical or ing action.

I provide a plurality cylindrical or toric, and of any size and 3 ournaled 1n bearings brackets 5 of vertical spindles at forming part of focal length, may be ground, and'furtherfixed to the frame 1 of the mamore, by which lenses of one character are YORK, N. Y., ASSIGNOR TO THE MEYROWITZ MANU- ground in one part of the machine at the f chine. 6 designates shafts also preferably same time that lenses of another character vertically journaled in brackets? at the op are being ground in anotherportion of the posite side of the frame from the spinmachine. A machine of this character 18'! dles 3. These shafts constitute the operatparticularly adapted for the use of retail ing means by which the work is moved over Opticians who can in this way make a great i variety of lenses very rapidly, turning them I shafts 6 are driven from the counter-shaft 8 out in lots the machine, but in which the individual I lenses are of different characters to suit the variety of prescriptions which the Optician is called upon to fill.

It is evident that the machine must be frame 1, and loose pulleys 10 8 has pulleys 12 from which belts 13 pass over the idlers 14: to pulleys l5 loose on certain of the shafts 6. To each pulley 15 having the usual tight and adapted to simultaneously grindany proportion of spherical or toric or cylindrical pulley 17. The remainder of the spindle lenses within its capacity. In carrying out driving shafts 6 are provlded with corremy invention, I secure this result by a ma spondingly grooved pulleys 17, also loose and simple character, in thereon. These are belted to the of l which are fixed to the pulleys 15. Pulleys lenses are made very easily, so as to be l 17 and 17 adapted to the use of any retail Optician: hollolwed clutc who is ordinarily not a skilled technical t 21 designate cone members of the fricmechanician. I With these and other objects in View, my 'tion clutches splined on the shafts 6, 6 and spring-impelled downward by the invention consists in the features of consprings 22.

struction and combination as hereinafter set forth and claimed. 23 denote collars forming part of the cone In the drawings: Figure l is a side elevamembers 21 of the frictlon clutches and tion of a lens grinding machine embodying which are engaged by the pins 24 of forked the principles of my invention. Fig. 2 is a levers 25 wh ch embrace the shafts 6 in the vertical transverse sectional view of the manner particularly shown 111 F1 2 and same. Fig. 3 1s a section on the line X-X' 4c. The levers 25 are pivoted on brackets chine of compactout to form part of the friction of Fig. 2, looking in the direction of the 26 forming part of the rame of the maarrow III; Fig. at is a section on the line chine, and may be displaced upward by cam XX of Fig. 2, looking in the direction of I arms 27 fixed to rods 28 extending transthe arrow IV. Fig. 5 is a vertical sectional 1 versely through the machine.

limited only by the capacity of revolving in bearings 9 at the base of the and 11. This counter-shaft thereis rigidly or integrally fixed a grooved have a part 20 which is coned or and the cams 27 caused to raise or lower the machine.

. by belts the work supporting the upper extremities of the which project crank I that the speed rically slotted levers 25. It is evident that these movements of the levers 25 are accompaniedby corresponding movements of the cone clutch membersl2l, so that the shafts 6, 6 are engaged in or disengaged from driving relation by movements of the operating handles 29. These handles are on machine having the grinding spindles 3, and which may be termed the front of the Each of the shafts 6 6 serves a double function in accordance with my present invent-ion. There are fixed on the shafts one or more pulleys 35 which are belted to corresponding pulleys 36 on the spindles 3,

3 I ordinarily make use of cone pulleys so ratio can be varied. It is evident that the spindles 3 operate, therefore, in unison with their corresponding driving shafts 6, 6 and are therefore controllable through the lever arms 29 above described. In addition to this function of the shafts 6, 6 I provide means by which devices are moved'or manipulated for the respective. grinding heads by means of these shafts. 38 designate face plates or crank disks fixed to s indle 6 6 through the top 0 the table 2 for this purpose. the face plates or crank disks 38 diametat 39, so 40 maybe adjusted to different radn o throw by tightening the respective adjusting bolt or screw 41. 42 designates a crosshead .uided to reciprocate on fixed pins 43 rigi ly supported from the frame of the machine at 44.. This cross head has a link connection 45 with the in 40, so as throu an adjustable degree of movement there om. i I j 46 designates the work-supporting which is adjustably. fixed to a freel swinging arm 47 pivoted on the crossead 42. The work-supporting device 46 preferably has a rigid re 48 which is received in a sleeve 490 11' the arm 47 and tightened in any desired relation by aset-screw 50.

This arm 47 swings freely in a vertical lane and may be adjusted from 'side' to si e by changing the relation of the pivot' pins or screws 51, by which the arm 47 is suported on the cross-head 42. j

53 desi nates a rigid projectin pin or member spending downwardly rom the work-supporting device 46, be-pointed at its lower end 54, so as to engage the usual lens holder or runner with a universal joint connection.

55 is a weight resting on thework-supporting device 46, for imparting a proper device the side of the throw suitable to ticular lens to be ground.

As shown in Fig. 2,1make P I beneath the correspon that the crank pins,

" f' stitute-a support for a to be moved to and fro,

and which may i found that any particular point on bearing engagement of the work on the grinding heads in action.

In rmding spherical lenses, a spherical tool is fastened at theupper extremity of any of the spindles 3, preferably by means of achuck 61. The work-supporting .device 46 is now adjusted so that the pin point 54 reciprocates of the tool 60 preferably 'to one side ofthe center thereof, and through a range of justment' is made by 51, and the adjustment of the throw is determined by varying the position of the. crank-pin 40 in its slot 39. The lenses,

over the surface i the character of the par- The lateral ad-- the screw pivot pins cemented to any usual runner, are there- 'upon pressed upon the rotating surface'of given a continuously shift the tool 60, and ing-movementwhich is suitable for the purposes of grinding spherical lenses in a manner'which is well known and need not be particularly described in this application.

'The above mechanism is not adapted" to grinding cylindrical ortoric lenses, and I provide means by which any number of these can be ground on certain of the grinding spindles, while the remaining spindles are in usevfor spherical lenses.

Referring particularly to Figs. 5 and 6, 65 designates a device adapted to be clamped upon the frame 1, so as to be rigidly suported in a position above the spindle 3 and ding work-supporting device 46. The frame 65 is adapted to contoric lens grinding tool and is adapted to impart a reciprocating movement to such tool of the n achine'in a direction at right-angles to the rcipnocating movement of the work. For this purpose the frame 65 has a pair of parallel, guide rods which constitute sliding supports for a cross-head 67 adapted to receive a toric or cylindrical tool 68 in fixed relation thereon. 69 designates a face plate or crank disk' similar in construction to the crank disk 38 and having an adjustable crank pin 7 0 with a connecting rod 71 extending to the cross-head 67, so as to reciprocate the same on its guiding rods. The

crank disk 69 is receivable upon the u per extremity of the spindle 3 in place 0 the during the ,action tool 60 already described. By this mechanism the toric or cylindrical tool; 68 is caused to reciprocate with any desired throw during the back and forth reciprocatlon of the work. The speed relations are fixed by the cone pulleys 35 and 36, and it is ordinarily advantageous to have the back and forth reciprocatlon of the toric tool several times as rapid as that of the work, which causes the tracing of very complicated geometrical ularly adapted togrindin 9.

curves partic erfect toric or c lindrical lens. It wil be the tool passes overthe'lns in a continuously varywork supporting device, and means coning path, which produces a uniformly di tributed grinding action at every point. i

The method of clamping the frame 65 upon the table 2 may, of course, be of any desired sort. I prefer to make use of brackets 75 which receive screws 76 passing down into nuts 77 on the under side of the table. Theshape of the brackets 75 is adapted to fit over the edge of the usual pan 78 which surrounds the grinding head, so as to collect the emery or polishing abradant which es capes from the surface of the todl in the grinding action. During the operation each lens can be separately inspected or removed or readjusted by stopping its appropriate grinding spindle through the corresponding lever arm This action does not interfere .With the grinding of the remaining lenses, so that the machine can be kept constantly working a'tits full capacity, regardless of the stageor character of the work at each particular spindle.

lVhat I claim is:

1. In a lens grinding machine, tool-carrying spindles, separate Vertically arranged shafts belted thereto, a continuously rotating counter-shaft, separate means for clutching said spindle-driving shafts into driven relation from said counter-shaft, work-supporting devices, means for guiding the same to reciprocate in a rectilinear path across the tool-carrying spindles, and means for reciprocating the same from said spindle driving shafts in a direction at right angles to said first named reciprocation.

2. In a lens grinding machine, a tool-carrying spindle, a work-supporting device, means for reciprocating said device across the end of the tool-carrying spindle, means for adjusting the throw?- of said work-supporting device, and means for laterally adjusting the line of movement thereof.

3. In a lens grinding machine, a tool-can rying spindle, a shaft for driving the same, means for changing-the speed ratio of such driving connection, a source of power, a

nected with said shaft for reciprocating the work-supporting device across the end of the tool-carrying spindle in a rectilinear path.

4:. In a lens grinding machine, a spindle, a tool-carrying cross-head adapted to reciprocate across the end of said spindle, connections between said spindle and cross-head for reciprocating the latter, a shaft operatively connected to said spindle. for driving the same, a Work supporting device adapted to reciprocate in a path .across the directionof movement of said cross-head, and connections between said shaft and said device to reciprocate the latter.

5. Ina lens grinding machine, a too1-car rying spindle, a driving shaft for said spindle, a Work-supporting device guidedto reciprocate across the end of said spindle,

means connected to said'shaft for reciprocating said device, a tool, and means operated by said spindle for reciprocating said tool,

across the path of movement of the worksupporting device.

6. In a lens grinding machine, a spindle, a device having a cross head detachably receivable over the end of said spindle, connections between said spindle and cross-head for reciprocating. the latter, a Work-supporting device movable across the direction of movement of said cross head, and means for driving'said spindle and reciprocating said Work-supporting device. v I v 7. In a lens grinding machine, a" frame having a pan, a spindle prqectingante said.

pan, a device received aboveisaid pan and having a cross -'head, connections between said spindle and said cross head for reciprocating the latter, a work-supporting device, and means for reciprocating the latter across the direction of movement of said cross-head.

In witness whereof, I subscribe my signature, in the presence of two witnesses.

. FERDINAND BUCHHOP.

"Witnesses:

ALFRED W. PROCTOR, i WALDO M. CHAPIN.

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