US1003816A

US1003816A - Lens-grinding machine.

Info

Publication number: US1003816A
Application number: US53965410A
Authority: US
Inventors: Frank Scoville
Original assignee: AVERY SCOVILLE
Current assignee: AVERY SCOVILLE
Priority date: 1910-01-24
Filing date: 1910-01-24
Publication date: 1911-09-19
Anticipated expiration: 1928-09-19

Description

F. SCOVILLE. LENS GRINDING MACHINE.

APPLICATION I`ILED'JAH.Z4, 1010.

Patented Sept. 19, 1911.

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F. SCOVILLE.

LENS GRINDING MACHINE.

APPLICATION FILED JAN.24,1910. 1,003,816, Patented Sept. 19, 1911.

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UNITED STATES PATENT oFFIoE.

FRANK SCOVILLE,.OF OAKLAND, CALIFORNIA, ASSIGNOR F ONE-HALF T0 AVERY SCOVILLE, OF OAKLAND, CALIFORNIA.

LENS- GRIN DIN Gr MACHINE.

Specification of Application led January 24, 1910.

I To all whom 'it may concern:

y l 3e it known that I, FRANK SoovILL-n, a citizen of the United States, residing yat Oakland, in the county of Alameda and State of California, have invented new and useful Improvements in Lens-Grinding Machines, ofwhich the following is a specification.

This invention relates to machines for grinding and polishing lenses, and partielllarly pertains to lens grinding machines which are adapted to grind cylmder, toric cylinder or other lenses having compound curvatures.

It is the'object of this invent-ion to produce a lens-grinding machine in which simple means are provided for moving the lens across the grlnding tool, and having means whereby the lens and the grindirig tool may both be revolved simultaneously in the same direction and in such manner that the axis of the lens, and the corresponding axis of the grinding tool will maintain a parallel relation to each other at all periods of the rinding operation.

A further ojectis to provide means whereby the lens'may be lifted from the' grinding tool so as to permit of the application of freshV grinding or polishing materiarls. A

Another object is to rovide a lens-carrying block which can gie readily removed from the machine so that the operator may occasionally inspect the work.

The invention consists of the parts, andl the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, 1n which- Figure l is a vertical section of the invention on the line --w Fig. 2. Fig. 2 is a plan View. Fig. 3 is a detail in side elevation of the lens-holder. Fig. 4 is a front view of same. Fig. 5 is a diagram illusytrating the relative position of the lens and the' lens view of t away. Fig. 7 is a diagram in plan,

rinding tool. Fig. 6 is a front ge machine, with a portion broken/ showing 'the parallel position -of the corresponding axes of the lens and inding tool, as the former travels across t e face of the latter. Fi 8 is a detail in vertical section of the adjustable eccentric.

4In the drawings A represents the base'or bed-plate of the machine, which may be constructed and mounted in any suitable manl ner. A standard 2 is formed on the bedplate A, and is adapted to support a hous` l mg or carriage 3 which is swivelly mounted on the standard 2 and adapted to be oscillated or swun from side to side thereon as later described. l

A drive-shaft 4 extendswupward through the standard 2, the upper end terminating y within the housing or carriage 3; this upper end being litted with a pinion 5 which meshes with an idler-gear 6 suitably mounted within the housing. The drive-shaft 4 is also provided with a inion 7,- corresponding in size to the pinion 5. The pinion 7 is secured to the shaft beneath the bed-plate A and meshes with an idler-gear 8, a trifle smaller in size than the idler-gear 6 suitably mounted on the underside of the bedplate, as shown in Fig. 1.

A spindle 10, carrying a grinding tool 11, is provided with a gear l2 which meshes with the idler 8. The spindle 10 extends through, and is supported upon a standard V13 on the bed-plate A, and is provided with a dust-cap `14 beneath the tool 11.

A lens-carryingvspindle 15 is vertically mounted in the vhousing 3, and is adapted to be reciprocated up and down by means of a lever-16, fulcrumed at 17, and so constructed as to be connected to a vfoot-pedal at one end,and is provided with a handle 16 at the oppositevend.

A gear 17 mounted on the spindle 15 meshes with the idler-gear 6 on ythe insie of the housing 3, and is of such length s .to be iny constant engagement with the gear 6, irrespective of the position assumed by the spindle 15 as it is moved up or down by the lever 16.

A yoke 18 is formed on the lower end of the spindle 15, in which a spider or crossarm 19 is pivotally mounted. The outer free ends of the cross-arm are provided with upwardly and downwardly projecting flanges which carr a device for engaging and disengaging t e lens-carrying disk or block 20.

Oppositely disposed lugs 21-21 are formed on the lens-carrying block 20, and are perforated yat their upper ends with holes 22 which are adapted to register with corresponding holes in the downwardly projectin flanges on the cross-arm 19.

ounted in the upwardly proJectmg flanges on the cross-arm 19 isa pair of parallel disposed pins 23, which extend horizontally across the cross-arm, one end of each pinbeing provided with a button or head 24, and thevopposite end being bent ydownward and inward so that the opposite end 25 will extend through the holes in the lower flanges and project into the holes 22 inthe lugs 21 of the lens-holding block 20. Stiff springs 26'act upon the pins 23 to normally retainy the ends 25 in engagement with the disk 2O as shownin Fig. 4. By pressing vthe buttons or heads 24 toward each other, and in opposition to the springs 26, the` ends 25 will be .withdrawn from the holes 22, and this permits of the ready removal of the lens-carrying block 20.

The housing 3, carrying the idler gear 6 and the lens-carrying spindle 15 is turned from side to side on the standard-2, by means of an adjustable eccentric 27 which is mounted on a vertical shaft 28, and is driven from the drive-shaft 4 through the pinion 7, idler 9 and a gear 29 on the lower end of the shaft 28, said pinion 7, meshing with the idler 9. The eccentric is connected to the housing 3 by means of a link connection, an arm 30 on the housing 3 being pivoted at 31 to the eccentric arm 32.

In operation the lens to` be ground is fastened tothe under-side of the lens-carrying block 20, with a suitable cement. Emery or other desired grinding. or polishing material is then placed upon the grlnding tool 11-vin the usual manner.- The grinding tool 11 and the lens-carrying block 2O areV then caused to revolve in the same direction by driving the shaft 4in any suitable manner. At the same time,I the lenscarrying block 20, 'with its lens, is caused tov travel back and forth over the grinding tool by means of the eccentric 27 and its connections, which yswing the housing 3 on the standard2. The lens is then brought in contact with the grinding tool, the,f weight ofthe gear 17 being sufficient to retaln the lens upon the tool.

By lifting the lever 16 by the, lever 16, the'block 20 may be raised to its uppermost position so that when the lens is lifted from the grinding tool 1-1 into the position shown in Fig. 1, it permits of the application of fresh emery or other grinding material to the grinding tool 11 without necessitating the stopping of the machine.

The grinding action .of this machine is accomplished in the essential manner necessary t'o the successful manufacture of lenses,.

which s to constantly maintain the axis of the lens, and the corresponding axis of the grinding tool in parallel relation, as illustrated in diagram in Fig. 7. It will be seen that by virtue of the idler-gears 6 and 8, through which motion is transmitted to the grinding tool and the lens-carrier, from the drive-shaft 4, the

gears

12 and 17, and their vprefer to employ at its ends on said spindle,

spindles will maintain the same relative position regardless of the positionof the housing 3, the gears, same diameter.

The idler-gear 6 in the housing 3 is slightly larger in diameter than ythe idler 8 and the

gears

12 and 17 are of equal diameters thus disposing the shafts 10 and 1,5 slightly eccentric to eachother.' By this construction the lens on the lens carrying block 20 on the shaft 15 will be carried across thegrinding tool l11 in such manner that the center ofthe lens will be slightly eccentric -to the center of the tool as shown in Fig. 5,

thus insuring a constant grinding actlon.

While I have shown' spur-gears in the drawings, it is obvious that the same results can be accomplishedthrough the medium of bevel. gearing, spiral gearing, cranks, or their equivalents. It is also apparent that one, tWo, or more grinding spindles and,

lens-carrying spindles y can be mounted around the pinionsv 5&7 and be driven through idler-gears, similar to 6 8, but yI two, as illustrated inthe drawings in Figs. 2 and 6, ,as by this. arrangement a pair of lenses can be ground at one operation. f

5, 7, 12, 17 being vof the Having thus described my invention, what Y I claim andrdesire tol secure by Letters Patent is-- 1..In combination with a lens-grinding machine, means for removably engaging the lens-holder with the lens-carrying spindle, comprising a cross-arm pivotally mounted and oppositely acting spring-pressed means on sald'crossarm for engaging a lens-carrying disk substantially as described.

2. In a lens-grindingmachine having a rotatable grinding tool and a rotatable lensx holder mounted eccentric to the grinding l l tool, means for rotating the grinding tool and the lens-holder in the same direction, said means comprising a vertically disposed drive shaft a inion on the upper end of said driveshaft meshing with said idler gear, anda second inion on said drive sha t meshing with an' idler gear meshing 'with a pinion to rotate the grinding tool.`

3.`In alens-grinding machine having a rotatable grinding -tool and a rotatable lensholder mounted .eccentric to the grinding tool, means for rotating the grinding tool and the lens-holder in the same direction, said an idler gear meshing with said ypinlon, a pinion'on a lens-carrying spindle vlao means comprising'. a vertically disposed drive f shaft, pinions on the "drive sha t meshing with idlergears, separate spindles carrying the grinding tool and the lens-carrier,`and gears on said spindles meshing with the idler gears. f

4. In a lens-grinding machine having a rotatable grinding tool and a rotatable lensholder mounted eccentric to the grinding ytool, means for rotating the grinding ltool and the lens-holder in .the same direction, said means comprising a vertically disposed drive shaft, pinions on the drive shaft meshing'with idler gears, separate spindles carrying the grinding tool and the lens-carrier, gears on said spindles meshing with the idler gears, and adjustable'means for mov- `ing said lens-holder back and forth across the grinding tool. Y

5. In a lens-grinding machine, the combination of a bed plate, a tubular standard formed thereon, a housingpivotally mounted on the tubular standard, a vertical lens carrying spindle slidably mounted in the housing, a gear fixed on said spindle, and transmitting gears within the housing,

`means for operating said transmitting gears, and adjustable means for said housing on the standard.

6. In a lens-grinding machine, the combination of a bed plate, a tubular standard vertically disposed thereon, a housing pivotally mounted on the standard, adjustable means for (.scillating said housing, a vertically disposed drive shaft extending through said standard terminating in said housing, a pinion on the upper end of said drive shaft,`an idler gear mounted on the housing' meshing with said gear, a lens-carrying spindle vertically mounted in the housing, and a gear fixed on said lspindle in constant mesh with said idler gear and rotatable thereby.

7. In a lens-grinding machine, the combination of a bed plate, a tubular standard oscillating ,vertically disposed thereon, a housing pivotally mounted on the standard, adjustable means for oscillating said housing, a vertically disposed drive shaft extending through said standard' terminating in said housing, a pinion on the upper end of said drive shaft, an idler gear mounted on the housing-meshing with saidI gear, a lens-carryiiigspindle. vertically mounted in the housing, a gear fixed on said spindle in constant vmesh with said idler gear and rotatable thereby, means for reciprocating said spindle while being rotated, and zwhile the gear thereon is in mesh with the idler, a pinion on the dri-ve shaft below the bed plate, an idler gear mounted on the bed plate in mesh therewith, a vertically disposed spindle mounted in said bed plate, and a gear on said spindle in constant mesh with said idler and 'rotated thereby to revolve the spindle.

8. In a lens-grinding machine, the combination of a bed plate, a tubular standard vertically disposed thereon, a housing pivotally mounted on the standard, adjustable means for oscillating said housing, a verticallydisposed drive shaft extending through said standard terminating in said housing, a pinion on the upper end of said drive shaft, 'an idler gear mounted on the housing meshing with said gear, a `lens-carrying spindle vertically mountedhin the housing, a gear fixed on said spindle in constant mesh 'with said idler gear and rotatable thereby,

means for reciprocating said spindle While being rotated and While the gear thereon is in mesh with the idler, a pinion on the drive shaft below therbed plate, an idler gear mounted on the bed plate in mesh therewith, a vertically disposed spindle mounted in said bed plate, and a gear on said spindle in constant mesh with said idlerand rotated thereby to `revolve the spindle, the gear on thelens-carrying spindle being of smaller diameterthan the gear on the last lnamed spindle and said spindles being disposed eccentric to each other.

9. In a lens-grinding machine, the combination of a bed plate, a tubular standard vertically disposed thereon, a housing pivotally mounted on.the standard', a vertically disposed drive shaft extending ythrough said standard terminating in said housing, a pinion on the upper end of said drive shaft, an idler gearmounted on the housing meshing with said pinion, a lens-carrying spindle vertically mounted in the housing,

a gear fixed on said spindle in constant mesh with said idler gear and rotatable thereby, means for reciprocating said spindle while being rotated and While the gear thereon is in mesh with the idlera pinion on the drive i shaft below the bed plate, an idler gear mounted en the bed platein mesh therewith, ay vertically disposed spindle mounted in said bed plate, a gear on said spindle in constant mesh with said idler'a'nd rotated thereby to revolve the spindle, the gear on the lens-carrying spindle'being of smaller diameter thany the gear on the last named spindle and said spindles being disposed eccentric to each other, an adjustable eccentric and a means meshing with the last named pinion onfthe drive shaft for rotating said adjustable eccentric to oscillate the housing and carry the lens-carrying spindle across the grinding tool.

10. In a lens-grinding machine, the combination of a bed plate, a tubular standard vertically disposed thereon, a housing pivotally mounted on the standard, a vertically disposed drive shaft extending through said standard terminating in said housing, a pinion on the upper end of said drive shaft, an idler gear mounted on the housing meshing with said pinion, a lens-carrying spindle vertically mounted in the housing, a gear fixed on said spindle in constant mesh with said idler gear and rotatable thereby, means for `reciprocating said spindle While being rotated and while the gear thereon is in mesh with the idler, a pinion on the drive shaft below the bed plate, an idler gear mounted on the bed plate in mesh therewith, a vertically disposed spindle mounted in said bed plate, a gear on said spindle in constant mesh with said idler and rotated thereby to revolve the spindle, the gear on the lenscarrying spindle being of smaller vdiameter than the gear on the last named spindle and said spindles being disposed eccentric to each other, an adjustable eccentric a means meshing with the last named pinion on `the drive shaft for rotating said adjustable eccentric to oscillate the housing andV carry the lens-carrying spindle across the grinding tool, a detachable and rockable lensholder on said lens-carrying spindle, and

means on said spindle to normally retain said lens-holder .in contact With the grinding tool.

In testimonyv whereof I ha'ye hereunto set myihand in the presence of two subscribing Copiesof this patent may be obtained for v cents each, by addressing the Commissioner 'of Patents,

Washington, I). C.