USRE10844E - foerster - Google Patents

Description

WITNESSES.-

E. FOERSTER.

3 Sheets-Sheet 1.

MACHINE FOR SAWINGSTONE.

ReissuedJune 14, 1887.

Fly]

N. PETERS, Pwo-Limn m hu, wmmu mm D. c

MI I/Us.

I E. FORESTER. a Shets-Sheet 2. MACHINE FOR SAWING STONE.

No. 10,844. Reissued June 14, 1887.

INVENTOR BY [Ah-w ATTORNEYJ r PETERS. PMoLinm wh-wminpw. u. c.

PATENT OFFICE.

EMANUEL FOERSTER, OF NE\V YORK, NLY.

MACHINE FOR SAWING STONE.

SPECIFICATION forming part of Reissued Letters Patent No. 10,844, dated June 14, 1887. Original No. 340,905, dated April 20, 1886. Application for reissue filed February 10, 1887. Serial No. 227,219.

To all whom it may concern:

Be it known that I, EMANUEL FOERSTER, of the city, county, and State of New York, have invented certain new and useful Improvements in Machines for Sawing Stone, of which the following is a specification.

This invention relates to machines for sawing stone, in which saws armed with diamonds or other hard stones are used as cutting-tools; and the invention consists of a machine for sawing stone in which a reciprocating sash that supports the saw-blade is raised by suitable mechanism at the end of each stroke and lowered at the beginning of the next stroke, so that the kerf can be cleared of debris, while the saw exerts a cutting action both on the forward and return'stroke.

' The'invention consists, further, of mechanism for feeding the sawblade l'orwardat or near the end of each stroke, and of a novel construction of sash, as will be more fully hereinafter set forth.

In the accompanying drawings,,Figure 1 represents a side elevation of my improved machine for sawing stone, showing one form or modification of mechanism for feeding the saw. Fig. 2 is a vertical longitudinalseetion of the same, drawn on a larger scale, showing another form of mechanism for feeding the saw. Fig. 3 is a plan view, partly in section. Fig. 4 is a vertical transverse section of the same on the line a: m, Fig. 3; and Fig. 5 is an end elevation of the mechanism by which reciprocating and vertical up-and-down motion is imparted to the saw-blade and its sash.

Similar letters of reference represent correspending parts.

A in the drawings represents a saw-blade, which is supported in the usual manner by a sash, B. The saw-blade A is mounted with a number of teeth having diamonds inserted therein in any approved manner. The sash B receives reciprocating motion by a pitman, B, from a driving crank-shaft, 0, Fig. 1. The sash B is supported by rollers 12 b on horizontal ways d (l of the supporting-frameD of the machine, and guided by cushions d of said ways, which cushions steady the sash and pre vent lateralvibrations of the same. The rollers b b are provided with toothed eccentric flanges b b, which engage racks b of the ways d. The eccentric portions of the toothed away by the water supplied to the kerf. At"

the beginning of the next stroke the sash and its blade are lowered again.

In place of the toothed eccentric flanges, smooth eccentric flanges may be used, which are guided in smooth grooves of the ways cl; or any equivalent mechanism may be used by which the sash-frame, with the saw, is lifted when arriving nearly at the end of its stroke. The ways (1 and the circumference of the toothed eccentric flanges are equal in length to the length of the stroke of the saw-blade.

The sash B is made of the usual construction in stone-sawingmachines; the sides of the sash being extended downward and connected at their lower ends by a longitudinal stiifeningpiece, Bflwhich extends transversely below the track on which the stone-supporting carriage is placed, and which serves for imparting greater rigidity to the sash, so as to give a better support for the saw-blade and diminish the longitudinal vibrations of the same.

The saw-blade is adjusted by traversing screw-nuts fat both ends on vertical screwrods F, that turn in bearings at the upper and lower parts of the sash. The screw-rods F are provided with bevel-wheels f at the upper ends, which mesh with bevel-wheels f, that are applied to the opposite ends of a hollow shaft,f*, having a longitudinal opening of square cross-section. A transmitting-shaft, j, of squarecross-section, is extended through the hub of one bevel-wheehf into the hollow shaftf the shaftf meshing byabevelwheel, f, at its end with a bevel-wheehf, ofatransverse shaft,f The tubular shaftf is supported in bearings g of the sash B at the top part of said sash and moved along with same, so as to slide along the square shaftf by the reciprocating motion of the sash.

A sidewise-projecting lug, h, is attached to the top part of the sash B, and serves to engage the downwardly-bent end of a horizontally-guided and spring-actuated rod, h, which is provided at its opposite end with a springpawl, h that engages a ratchet-whee], h, on the shaftf, as shown in Figs. 2 and 3. A seeeach return-stroke the *shank of the pawl h" is pushed by the sash, and thereby the ratchetwheel h turned for the distance of a few teeth, which motion is transmitted, by the shaftf bevel-wheelsf fflshaftsf f andbevel-wheels f f, to the screw-rods I and by the same to the traversing screw-nuts f of' the saw-blade,

so that the latter is gradually advanced into the kerf of the stone asthe same is deepened by the cutting action of the saw.

Instead of the ratchetwheel and pawls, I can use-for-feeding the saw the device shown in Fig. 1. Inthisfigureaninclined shaft, F, is

supported in suitable bearings and provided at the upperend with a bevel-wheel,' t, that meshes with the bevel-wheel f onthe shaft f Abevel-wheel, i, at the lower end of the shaft -F" meshes with bevel-wheels t on a counter-shaft, F, that turns in bearings below the supportfor the driving crank-shaft O, as shown in Figs. .land 5. WVhenrotary motion isimparted to the shaft Ii by a belt and pulley,'-,the blade is raised or lowered as desired. In that case the belt is shifted by. lever and belt-shifting device (not shown in the drawings) which is customary in stone-sawingmachines; but-rotary motion may be imparted to shaftF -by any other suitable means, if desired, and the shaft F may receive intermittentrotary motion by suitably-arranged devices, if desired. In this manner thesawblade can be quickly setin proper-positioirto the work and fed down during each stroke.

The operation of the machine is as follows: When the block of stone has been placed in position on its carriage, the blade is adjusted inzproper position thereto by the shaft F and its transmitting-gearing. The drivingshaft is then started, so that the sash commences its stroke. When arriving nearly at the end of the forward stroke,-it is lifted by the toothed eccentric flanges of the rollers, so as-to clear the kerf sufficiently for removing the debris. The'saw commences then its return-stroke, and is lowered again into the kerf, exerting a cutting action thereon until it arrives nearly at the end of its return-stroke, when it islifted again to give a clearance for the removal of the debris. blade is fedforward by the alternating action of the pawls h h on the ratchet-wheel h or of the shaft F, when so desired. By'lifting the saw at the end of each stroke and lowering the same at the beginning of the next stroke, and by imparting a forward feed to the saw at or near each end of the stroke, the saw exerts a cutting action during the forward stroke and return-stroke, and accomplishes thereby the sawing of the stone in a quicker and more effective manner than when the saw is lifted At the end of each stroke the from the kerf and moved clear of the same during the entire returnstroke, as heretofore. I am aware that machines for sawing stones have been used in which the saw received during its longitudinal motion through the kerf a series of ascending and descending movements between the commencement and termination of its stroke, so as to supply a new quantity of sand, which, however, is not required in diamond-cutting machines, as these are worked without feeding sand into the kerf in front of the cutting-edge of the blade. My construction differs therefrom, inasmuch as the ascending and descending movements of the saw take place near the end of one stroke and at the be; ginning of the next stroke, so that the saw cuts in both directions without being lifted from the kerf while passing through its longitudinal motion in either direction.

Having thus described myinvention, I claim as new and desire to secure by Letters Patent- 1. The combination, in a stone-sawing machine, of a reciprocating sash and a saw-blade provided with diamonds carried by said sash, means for feeding the blade in the'sash without feeding the sash, and mechanisnn substam tially as described, for imparting successively a positive lifting and a lowering movement to the sash and also to the blade at or near the ends of each stroke, and acontinuous rectilinear movement between thelowering movement at one end of the stroke and the lifting move ment at the opposite end of the same stroke.

2. The combination, in a machine for saw ing stone, of a reciprocating sash, a saw-blade IOO provided with diamonds carried by said sash,

longitudinallygrooved guideways, rollers on.

said guideways supporting said sash ,provided with eccentric flanges for imparting successively a lifting and a loweringmovement to the sash at or near the ends of each stroke, and devices, substantially as described, for

imparting a' continuous rectilinearmovement to said sash between the lowering movement at one end of the stroke and the lifting movement at the opposite end of the same stroke.

3. The combination of a reciprocating sash,

a saw-blade having transverse screw-nuts,vertieal screw-rods, a hollow tubular shaft, bevel gears connecting said shaft with the screw-rods, a square transmitting-shaft extending into said tubular shaft, a ratchetwheel, spring-pawls engaging said ratchet-wheel, and being alter nately actuated by the sash, and transmitting bevel-wheels between the ratchet-wheel and square shaft, substantially as set forth.

4. In a sawing-machine, the combination of the reciprocating sash and saw blade with mechanism, substantially as described,for feeding said saw-blade near the end of each stroke of same without feeding the sash, as specified.

5. The combination of a reciprocating sash, a saw-blade having nuts at both ends, vertical screw-rods, transmitting bevel-gears, a tubular shaft turning in bearings on the sash, a

square transmitting-shaft extending into said gitudinal brace connecting the lower ends of said sides below the stone-supporting carriage and its track, combined with the saw-blade which is attached to the vertical sides of said sash, substantially as set forth.

EMANUEL FOERSTER.

\Vitnesses:

HARRY M. TURK, JOHN M. SPEER.

Images