US1298979A - Edge-grinding machine for lenses. - Google Patents

Description

E. M. LONG.

EDGE GRINDING MACHINE FOR LENSES.

APPLICATlON FILED MAR. 1a. 1918.

1,298,979., Patented Apr. 1,1291% 3 SHEET$SHEET 1- ATTORNEY.

E. M. LONG.

EDGE GRINDING MACHINE FOR LENSES.

APPLICATION FILED MAR. 18. I918.

1,298,979" Patented Apr. 1,1919.

3 SHEETS-SHEET 2.

E. M. LONG.

EDGE GRINDING MACHINE FOR LENSES.

APPLICATION FILED MAR. 18. 1918.

1,298,979., v Patented Apr. 1, 1919 r 3 SHEETS-SHEET 3.

of I I\ w ATTORNEY.

snares ELI M. LONG, OF GENEVA, NEW YORK, ASSIGNOR TO THE STANDARD OPTICAL COMPANY, OF GENEVA, NEW YORK, A CORPORATION OF NEW YORK.

' EDGE-GRINDING MACHINE FOR- LENSES.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Original application filed June 2. 1916, Serial No. 101,282. Divided and this application filed March -18,

1918. Serial No. 223,040.

To all whom it may concern Be itknown that I, ELI M. LONG, a citizen of the United States of America, and resident of Geneva, in the county of Ontario, in the State of New York, have invented new and useful Improvements in Edge-Grinding Machines for Lenses, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in edge-grinding machinesfor lenses, in which the rotary lens-holder is reciprocated axially across the face of a rotary grindstone for reducing the lens to the desired form according to a predetermined pattern, as a division of my pending application, Ser. No. 101,282, filed June 2, 1916.

The main object is to increase the general working eiiiciency of machines of this character by reciprocating the lens-holder across the face of the grinder through the medium of an oil pump and adjustable means for reversing the direction of flow of the oil from the pump and varying the distance of travel of the carriage at will.

Other objects and uses relating to specific parts of the machine will be brought out in the following description.

In the drawings Figures 1 and 2 are, respectively. atop plan and a side elevation of an edge-grinding machine embodying the various feature of my invention.

Figs. 3 and 4 are enlarged vertical sectional views taken, respectively, on lines 3-3 and 44, Fig. 1.

Fig. 5 is an enlarged vertical sectional view through the front portion ofthe machine taken on line 5-5, Fig. 1.

Figs. 6 and 7 are further enlarged horizontal sectional views taken in the planes of lines 66 and 7-7, Fig. 5.

Fig. 8 is an enlarged detail sectional view taken on line 88, Fig. 2.

Main supporting frame.

As illustrated, the main supporting frame consists of a substantially semi-circular trough-like shell or casing 1 adapted to be secured in a horizontal osition to any available support for receiving and inclosing the lower half of a rotary grindstone, presently described, and confining the waste resulting from the grinding operation, together with the drip of water used in moistening the periphery of the grindstone, the lower front side of the trough being provided with a cleanout opening 2 and a closure 3 therefor, as shown more clearly in Fig. 3.

A shield 4 is secured to the upper rear edge of the main frame 1 and constitutes a part thereof and incloses the upper rear portion of the grindstone for confining the waste within the environs of the underlying trough.

A waste-containing reservoir 5 is mounted upon the upper front end of the shield 4- directly over the grindstone and is provided with a suitable faucet 6 for supplying moisture to the periphery of the stone.

The front portion of the frame 1-- is provided with an upwardly and forwardly inc-lined guidway -7 along and upon which is adjustable a movable section 8 for receiving and supporting a sliding carriage for the lens-holding frame and truing device, hereinafter described, the movable section 8 being held in its adjusted position by one or more clamping bolts 9, Fig. 2.

Grinding device.

As illustrated, the grinding device con sists of a rotary circular grindstone -10 adapted to revolve in the frame 1 and shield l, and for this purpose is mounted upon a rotary shaft 11 which is journaled in suitable bearings 12 on the upper edges of opposite sides of the frame -1- and is provided at one end with a pulley -13- adapted to be connected by a belt 14 to any available source of power, not shown, the grindstone being held against axial movement by suitable collars on the shaft at opposite sides of the grindstone.

Sh'dz'ng carriage and operating means therefor.

The top of the adjustable section 8- of the main supporting frame 1 is disposed in a substantially horizontal plane and is preferable recessed to form a lengthwise guideway 15- running parallel with the axis of the grindstone shaft 11.in proximity to the front edge of the grindstone -10 for receiving and guiding a sliding carriage 16- which is held against upward displacement by dove-tail connections, shown more clearly in Fig. 3.

The adjacent sides of the section 8 and carriage 16, Fig. 3, are chambered longitudinally at 17 and 18-, respectively, for receiving a hollow cylinder 19 which is rigidly secured to the bottom of the section 8 parallel with the guideway 15 for receiving a reciprocatory piston 20, Fig. 5, having oppositely projecting piston rods 21 extending through suitable glands in corresponding end heads 22- of the cylinder, said piston being adapted to be operated in reverse directions bv fluid pressure, as oil, through the medium of a power-driven pumping device, hereinafter described, and also serves to transmit similar motion to the carriage -16.

For this latter purpose, the carriage is provided with pendent abutments 23 and 24 engaging the outer ends of the piston rods 21, (see Fig. 5), the abutment 23- being rigid or integral with the carriage, while the other abutment 2 l is adjustable, it being pivoted at 25 to suitable lugs on the under side of the carriage and provided with a laterally projecting shoulder 26 registering with an adjusting screw 27 insaid carriage for taking up any lost motion between the abutments and piston rods.

As shown in Fig. 5, the central portion of the section 8- of the main supporting frame is provided with an upright pendent pump case 28- suitably secured to the under side thereof directly under the central portion of the cylinder 19 for receiving a rotary valve 29- having an eccentric bore 30-, in which is mounted a rotary impeller 31- coaxial with the axis of the valve and, therefore, eccentric to the, bore thereof, said impeller being provided with one or more, in this instance four, radial blades 32 spring-pressed outwardly against the walls of the bore 30 by coil springs 33, Fig. 7. I

The valve 29 is fitted to turn freely in the central bore. as 28, of the pump case and is provided with a pair of ports -l at diametrically opposite sides of the impeller, but mainly to one side of the center of the bore 30 for communication with corresponding ports 35 in diametrically opposite sides of the pump case 28.

These ports 35 communicate with up right. passages 8fi in the pump case 28- and extend through the superposed portions of the section 8 where they communicate with radial ports -37 in the adjacent side of the cylinder -19 at opposite ends of the piston 20- so that if the valve 29 is in the position shown in Fig. 7 and the impeller is rotated in the direction indicated by the arrow in the same figure, the circulating fluid, as oil, will be drawn from the right-hand end of the cylinder through the corresponding passage 36- into the impeller chamber and then forced through the left-hand passage 36 into the cylinder 19 at the left-hand end of the piston 20, thereby forcing said piston to the right (Fig. 5) and effecting a similar movement of the carriage 16- in the same direction, while on the other hand if the valve 29 is rotated,a half revolution to reverse the position of its ports -3l, the movement of the piston -20 and carriage will be correspondingly reversed.

The pump case 28 and cylinder -19 are secured, respectively, to the lower and upper faces of the. intermediate portion of the frame section 8 by bolts 38, Figs. 6 and 7 and, therefore, become a rigid part of the frame, but separable for convenience of manufacture.

The upper and lower ends of the valve 29 are closed by suitable plates or end heads 39 to prevent leakage of the pressure fluid and are preferably secured to said valve 29 to rotate therewith. The impeller -3l is preferably driven from the grindstone shaft 11 through the medium of suitable connections, and for this purpose is secured to an upright shaft 40 which is journaled in the pump case 28 and is provided with a worm gear 41- keyed thereto.

Meshing with the worm gear 41- is a worm 42- (Fig. 3) on a horizontal shaft l3 which is journaled in suitable bearings on the pump case 28 and frame section 8, and is provided with a grooved pulley 44- connected by a belt 45 to apulley '4tl on the griudstone shaft 11 (see Fig. 4). thus rotating the impeller continuously as long as the grindstone is in operation. 1

Automatic wwcrse control.

A horizontal rock shaft l7 is journaled in the central portion of the frame section 8 between the pump case 28 and cylinder 19, and preferably in the same plane as and at right angles to the axis of the impeller shaft -i:0, and is provided at its inner end with a double stop pawl or escapement 48 so as to rock therewith for alternately forcing the opposite ends of the pawl into the path of a yielding abutment 49- which, in this instance, constitutes a part of the lever -50 eccentrically pivoted at 51- to the top face of the upper disk or plate '39 of the rotary valve ring 29 so as to rotate with said ring, the lever 50 being also provided with a brake-shoe 52- for frictional engagement with the inner cylindrical walls of the pump case '28 when the'abutment 4:9 encounters either end of the stop pawl 48, as shown more clearly in Fig. 6.

The friction produced by the rotary impeller 31 and also thatv produced by the circulation of the oil tends to rotate the valve ring 29 and lever 50 thereon, but is prevented from such rotation by the engagement of the abutment 49- with one end or the other of the stop pawl ,48- and it, therefore, follows that if the holding end of the stop pawl is rocked from its holding position, the opposite end will be forced to a similar holding position, thus permitting the rotation of the valve ring 29 and lever 50- through a substantially half revolution for reversing the position of the ports 34 relatively to the ports 3 5 and thereby reversing the direction of flow of the fluid and effecting a corresponding reversal of movement of the piston 20- and carriage 16.

The free end of the lever 50, Fig. 6, is spring-pressed forwardly in the direction of rotation by means of a spring -53 to release the brake-shoe 52 from frictional engagement with the inner walls of the pump case 28 as soon as either end of the pawl 48 is withdrawn from holding engagement with the abutment 49.

On the other hand, when the abutment 49 encounters either end of the pawl -48 at the end of each half revolution of the valve ring -29-, it will automatically force the brake-shoe into frictional engagement with the inner wall of the pump case -28-, thereby aiding instopping the further rotation of the valve ring 29- until the pawl 48 is again shifted.

The rock shaft 47- extends forwardly through the front side of the frame section 8, as shown in Figs. 3 and 8, and is provided with an upwardly projecting radial arm 54 adapted to be operated by suitable devices on the front side of the carriage 16.

As shown more clearly in Figs. 3 and 8, these devices consist of a pair of spaced bell-- crank levers -55 having their upper ends pivoted at 56' to a forwardly projecting portion 57 of the carriage 16 and their lower ends provided with pins or lugs 58 disposed at opposite sides of the upper end of the arm 5 1, said levers being adjustable about their pivots 56- by means of adjusting screws 59 for permitting the operation of the stop pawl 48 and consequent reversal of the valve ring -29 earlier or later in the movement that the lens which is supported indirectly by the carriage will remain in contact with the grindstone in all positions of movement. of the carriage.

Lens holdingand operating means therefor.

The carriage 16 is provided at its opposite ends with upwardly and rearwardly projecting arms 60 carrying at their upper ends pivotal screws 61, Fig. 2, engaging and supporting the opposite ends of a forwardly and rearwardly oscillating frame 62 for receiving and supporting a lens-holder 63- and operating means therefor, the frame 62 being hollow and fluid-tight to receive a quantity of oil or other lubricant for lubricating the various moving parts therein.

Secured to one end of the frame 62 above its axis of movement is an extension 64 in which is journaled a shaft 65- to which rotary motion is transmitted from the grinder shaft 11 through the medium of the shaft 43- and suitable'connections between the shafts 43 and 65.

As illustrated more clearly in Figs. 1, 4 and 5, these connections consist of a worm 6(' on the shaft 43 meshing with a worm gear -6Z on the lower end of an upwardly extending flexible shaft 68, the upper end of which is provided with a spiral gear 69- meshing with a similar spiral gear 70- on the shaft -65.

The lower end of the flexible shaft 68.,. Fig. 4, is journaled in a' yoke .-7 1 which is pivotally hung upon the shaft 43, the

upper end of said shaft being journaled in a yoke 72 which is journaled upon an s10n 64 of the oscillating frame 62-,

the rock shaft -73 being rovided with a radially extending handle 5- by which it may be rocked to shift the gear 69 into and out of mesh with the gear 70- for stopping and starting the lens-holder independently of the grindstone or reversing mechanism for the carriage 16.

The outer end-of the shaft 65 is provided with a hand-wheel 76 by which the shaft 65 and parts operated thereby may be adjusted in the initial setting up of the machine. Y i

The lens-holder 63 comprises a pair of coaxial lens-clamping members operatively connected to suitable coaxial rotary spindles as 80, Fig. 1, to rotate therewith.

These spindles are journaled in suitable hearings in the lower portion of the oscillating frame 62 some distance below and parallel with the axes of the pivotal screws 6l for said frame and also parallel with the axis of the main driving shaft 65, each spindle being connected by a similar train of gears, not shown, to the opposite ends of a secondarydriving shaft '82, the latter being journaled in the upper portion of the frame -62 parallel with the axes of the lens-holder G3 a predetermined distance to one side of the axis of the main driving shaft 65, the gears being so constructed and arranged as to drive both of the lens-holders in the same direction at one-half the speed of the secondary driving shaft 82. W

Suitable means is provided for transmitting rotary motion from the main driving shaft 65 to the secondary driving shaft 82 and causing the secondary shaft 82-and lens-holder driven thereby to revolve in the same direction as the driving shaft, but at different speeds during each revolution so that all portions of the lens may be ground to the desired form at about the same time.

A lens pattern 89 is mounted coaxially with the lens-holder 63 to rotate therewith against a back-rest 111- to determine the form of the lens which is being ground.

Means, including a bushing 101 and an operating handle -102, is provided for operating one-of the parts of the lens-holder to-clamp and release the" lenses therein and therefrom.

Suitable means is also provided for automatically rocking the lower end of the frame .--62'toward the grindstone to cause the lens to contact therewith, and for this purpose a lever 10 3 is pivoted at -104. to

the outside of the upper portion of the shield 4- and is provided with a downwardly projecting arm 105 connected by a link -.-106 to an arm -107 on the frame -62, as shown more clearly in Figs. 1 and 2, said lever -103 being provided with a forwardly and rearwardly extendingguide 108 upon which is adjustably mounted a weight l09, the latter being held in its adjusted position by a set screw 110'-.

The periphery of the pattern 89 is adapted to ride against a suitable back-rest -111 which is mounted in a suitable guide 112 on the carriage .16- and may be adjusted by means of a hand-piece 113, said carriage being also provided with a suitable truing device '-114-capable of being adjusted at will to keep the face of the grindstone smooth and true.

The use of the eccentric valve ring --2Q- in connection with an impeller, as 3l-, for changing the direction of flow of the fluid without changing the direction of rotation of the impeller is believed to be hasicly new not only in connection with grinding machines, but as a mechanical movement adapted for various purposes.

What I claim is:

1. In hydraulicpower-transmission, the combination of a piston motor, an impeller for circulating fluid toandfrom the motor for operating the piston, a rotary valve aotuated by the impeller for reversing the flow of fluid to the motor to reciprocate the piston, and means actuated by the motor-for alternately and periodically stopping and releasing the valve.

2. In hydraulic power-transmission, the combination of a piston motor, an impeller for circulating fluid to and from the motor for operating the piston, a rotary valve actuated by the impeller for reversing the flow of fluid to the motor to reciprocate the piston, an abutment on the valve, a detent cooperating with said abutment to stop the valve, and means actuated by the motor for tripping the detent.

3. In hydraulic power-transmission, the combination of a' piston motor, an impeller for circulating fluid to and from the motor for operating the piston, a rotary valve actuated by the impeller for reversing the flow of fluid to the motor to reciprocate the piston, an abutment on the valve, detents movable alternately into and out of the path of said abutment, and means actuated by the motor for periodically withdrawing one detent from and simultaneously forcing the other detent into said path.

4. In hydraulic power-transmission, the combination of a piston motor, an impeller for circulating fluid to and from the motor by the impeller for reversing the direction of flow of the fluid, an escapement mechanism for periodically stopping and releasing the valve to produce said reverse flow and means actuated by said motor for operating the escapement.

I 5. In hydraulic power-transmission, the

combination of a piston motor, an impeller for c1rculating fluid to and from the motor for operating the piston, a rotary valve actuated by the impeller for reversing the flow of fluid to the motor to'reciprocate the pisfor operating the piston, a valve actuated for operating the piston, a rotary valve actuated by the impeller for reversing the flow of fluid to the motor to reciprocate the piston,.an abutment on the valve, a detent cooperating with said abutment to stop the valve, and means actuated by the carriage for tripping the detent.

7 In hydraulic power-transmission, the combination of a piston-motor, an impeller for circulating fluid to and from the motor for operating the piston, a valve actuated by the impeller for reversing the direction of flow of the fluid, an escapement mechanism controlling the operation of the valve, a carriage actuated by the motor, and means on the carriage for operating the escapement mechanism.

8. In combination with a fluid operated motor, a rotary impeller for circulating fluid to and from the motor to operate said motor, a rotary valve controlling said circulation and having means for reversing the flow of the fluid to and from the motor, an escapement controlling the operation of the valve, and means for controlling the operationof the escapement.

9. In combination with a fluid-pressureoperated device, a rotary impeller for the fluid, a valve ring surrounding the impeller eccentric thereto and provided with ports in opposite sides thereof, and means for shifting the ring circumferentially for reversing the position of its ports and thereby reversing the direction of flow of the fluid from the impeller to said device.

In witness whereof I have hereunto set my hand this 11th day of March, 1918.

ELI M. LONG.

Witnesses: I I

H. A. HERENDUM, M. I. GOETOHIUS.

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