US833538A - Band resaw-machine. - Google Patents

Description

No. 833,538. 1 PATENTBD OCT. 16, 1906.

E. c. MERSHON.

BAND RESAW MACHINE.

APPLICATION FILED nuns. 1905.

3 SHEETS-SHEET 2.

I E L INVENTOH E. mars/lam ,4 TTOR/VEYS 1H2 NORRIS PETERS co., WASHINGTON. n. c.

conformation of the wor PATENT OFFICE.

UNITED STATES EDWARDC. MERSHON, or SAGINAW, MICHIGAN.

BAND RESAW-M'AQCHINE.

Patented. Oct. 16, 1906.

Application filed January 18,1905. Serial No. 241,533.

Be it known that I, EDWARD C. MERSHON,

a citizen of the United States, and a resident of Saginaw, in the county of Saginaw and State of Michigan, (with post-ofiice address Saginaw, Michigan,) have invented certain new and useful Improvements in Band 'Resaw-Machines, of which the following is a I specification.

The present invention relates to sawingmachines, and more particularly to the means for guiding the saw-blade- The invention is particularly useful for band-saw machines, and for that reason the invention is shown in the accompanying drawings as applied to'a machine of that class.

The invention relates, rimarily, to the king face of the guide, or, in other words, the face which is in contact with the saw-blade; and the invention consists in providing the working face with refuse-receiving pockets or receptacles adapted to receive lumps of pitch, gum, sawdust, &c., which would otherwise come between theface of the guide'and the surface of the saw-blade and would thereby cause sudden jars. and strain to the bladeor make the same flutter or vibrate, thereby tending to produce crystallization of the blade.

'le my invention is useful for sawguides of any description, it is especially use ful and especially effective for machines in which the guide consists of a wheel and in which said wheel or wheels are employed as crowding-wheels, by whose lateral adjustment the plane of that portion ofthesaw I which does the cutting may be varied.

In carrying out my invention Iv prefer to make the refuse-holding recessesor pockets on the working face of the guide or guidewheel follow the circumferential line of the periphery, thus producing a wheel whichhas a number of annular grooves cut in the working face thereof and with intermediate narrow ridges or rings which engage the surface of the saw-blade. When the working face. is

thus formed, the pressure of the saw exerted against the narrow ridges or rings instead of cementing the pitch and sawdust to the circumference of the guide-wheel, as it would do in the case of a wheel whose surface is fiat or unbroken, acts to press such refuse down intothe grooves or. recesses, whence, owing to "line of the working face, but might use grooves the direction of which forms a more or less acute angle with the'true circumference. Thus, for instance, said grooves might be diagonal or spiral grooves across the face of the wheel at an angle of forty-five degrees, more or less, or might consist of numerous milled pockets orrecesses therein, the only requirement being that there shall beno break in the circular line of the circumference of the wheel, such as would interrupt or vary the continuity of contact of the surface of the saw by a pressure device acting continuously in the circumference of a true circle. In other words, there must be no interruption in the continuity of the pressure by the working face of the wheel, since otherwise there would be a tendency to vibration. Hence grooves milled parallel to the axis of rotation of the wheel would not be suitable, for they would cause a fluttering of the'saw, whereas theobject of my invention is to cause the saw to run with approximatelythe same smoothness as it would run if engaged by a wheel having a perfectly smooth or unbroken periphery under the best conditionsthat isto say, without the presence'at any'timeof foreign material between the engagingsurfaces or pointsof the guide-wheel and saw, respec- 'Another advantage secured by my invention is the doing away with any possible aircushion between the saw and guide due to the rapid revolving of the wheels and travel of the saw.

My invention further relates to the manner of mounting and adjusting the position of guide-wheels used as crowding-wheels to'determine the position of the lane'of that porconsists in the novel featuresand'detail's of construction hereinafter described and then specified in the claims. I j j In the accompanyingdrawings, Figure l is a rear elevation of aband-saw machine equipped With saw-guides or crowding-wheels constructed in accordance with my inven Fig. 2 is a sectional view taken on the" tion. line A B, 3, vertically through one of said wheelsand its supporting parts. Fig. 3

is a somewhat-enlarged detail view of one of said wheels as seen from the rear. Fig. 4 represents a portion of the face of a wheel in which the refusereceiving pockets or recesses are diagonal to the circumference of revolution. Fig. 5 shows a modified construction of the wheel. Fig. 6 is a plan of the wheel and its mounting. Fig. 7 is a diagram showing the relation of the guide-wheel to the saw and fence.

Referring to the drawings, S indicates the band-saw traveling on suitable wheels, as usual in the art, one of which is shown as provided with suitable means for adjusting its position to adjust the tension on the traveling band.

G indicates the usual fence or guide against which the material to be sawed is held by the driven yielding pressure-roll H in the usual manner.

0 C indicate guide-wheels which take the place of the usual saw-guide and are so mounted and applied to the saw that by suitable adjustment of their positions laterally the plane of that portion of the saw which does the cutting may be changed.

In the periphery or working face of each wheel are formed a number of annular grooves, as indicated more clearly in the sectional view, Fig. 2, and these grooves are separated by narrow ridges or rings the circumference of which engages and acts upon the saw to hold it in the required position. For the best results the width of each engaging surface should be as narrow as practicable, so as to afford little surface for imprisoning any foreign material between it and the surface of the saw, the general object being to remove as much of the periphery in contact with the saw as possible, while at the same time afiording a uniform or continuous engagement of the wheel and saw in the circumference of the circle or cylinder to which the saw is always tangent. As indicated in Fig. 4, the grooves or recesses and the ridges or engaging portions might be diagonal to the circumference of revolution.

As shown in Fig. 5, the wheel might be constructed from a number of circular steel plates Q, similar to the disks of an ordinary circular saw, but without teeth, and separated from one another by collars or washers R, all clamped together on the shafts, so as to provide two, three, or more disks operating together as a crowding-wheel, in which the spaces between the disks constitute the refuse-receiving recesses.

N is a suitable plate or block furnished with journal-bearings for the shaft of the wheel or guide C. Each guide-wheel is mounted on a suitable shaft turning in bearings carried by asupporting plate or block N, and the latter in turn is supported by a plate or carrier 0, which is suitably mounted so as to be capable of adjustment in a direction toward or away from the saw. The said line of the shaft carrying the guidewheel is transverse to the line of adjustment of the carrier 0. The adjustment of the carrier O, and hence of the wheel, toward and away fromthe saw may be effected by any suitable meansas, for instance, by the screw F or F turning in suitable bearings in the bracket or support M and engaging a nut P, secured to the carrier 0. The latter is suitably guided in the bracket M, and said bracket is preferably carried by a frame or table consisting of a slide M, guided on the frame of the machine and vertically adjustable thereon by any suitable means-as, for instance, by a screw D, operated by handwheel E. By means of screwsF F the crowding-wheels may be adjusted bodily against the saw to vary the position of the cutting portions of the saw with relation to the pressureroll H and fence G. By the screw D the upper crowding-wheel may be elevated to admit of the passage of wider stock through the machine, and likewise may be lowered when narrow stock is passing through the machine, as it is desirable to support the saw as close to the cutting portion thereof as is practicable. As will be obvious, either adjustmentnamely, that in a direction toward the saw or that in a direction substantially parallel to the line of the cutting portionmay be eflected without disturbing the other. I also mount the journal-bearing block or support N on the adjustable carrier 0 in such manner as to provide for a tilting of the axis of the crowding or guide wheel in a vertical plane or plane parallel to the plane of the working or cutting portion of the saw. By this means it becomes possible to correct any deviation of the axis of the crowding-wheel from a plane horizontally parallel with the planes occupied by the axis of the upper and lower main band-wheel shafts and to control to a certain extent the position that the saw will occupy on the wheels of the machine. Thus should the axis be tilted so as to depress the end opposite the rear edge of the saw-blade the saw would be caused to advance on the main band-wheels of the machine, and should said end be elevated a receding or backward movement of the saw on said main band-wheels will result.

The plate or support N may be mounted to rock on the carrier 0, so as to tilt the wheel in any suitable way-as, for instance, by sustaining it on a rocking bearing n at one end. Adjusting and set screws I I or other devices mounted, preferably, on the carrier 0 engage the other end and serve to adj ustably tilt the plate or support, and thereby tilt the crowding-wheel at any position of lateral adjust- -ment of the carrier 0 with relation to the saw-blade. The support N is held down to its rocking bearing by means of the bolt T or other suitable means. ,Each crowding or guide wheel is also mounted or supported in such way as to be capable of adjustment in a manner to turn or swing on its axis in a horizontal plane or plane substantially perpendicular to the plane of the portion of the sawblade against which it bears. For this purpose I prefer to mount the part N, upon which it is directly supported, in such way as to be capable of turning in said perpendicular plane. To permit this turning movement, the bolt I works in a slightly-elongated opening (not shown) in the carrier 0, and the bolt T serves as a pivot when the adjustment is effected by the pair of set-screws W, mounted in the carrier 0 and engaging the opposite sides of the plate N or by other suitable means. The-purpose of this adjustment is as follows: It sometimes happens that a sawblade is not so sharpened or set that the two sides of the blade are exactly uniform. Thus if the saw has less set on the side next the press-roll H than on the other side the timber passing through the machine may press the saw-blade toward the fence G, because of insufiicient clearance between the saw-blade and that portion of the timber lying between the saw and said press-roll H. Moreover, band-saws are very sensitive and require to be hammered or rolled, so as to expand certain portions of the metal and cause the tension strain of the wheels to be exerted toward the edges of the saw. This treatment of the blade by means of hammering on an anvil or by passing it between hardened-steel rolls may result in the saw-blade becoming convex or concave in certain portions in place of being perfectly fiat and true, and when in this condition the tendency is for the saw to lead or be crowded in the direction of its concave side. Alimited amount of imperfection of the saw blade or plate because of improper rolling or hammering or because of improper sharpening or setting may be overcome b cross-lining (as it is technically described) the crowding-wheels in a horizontal direction. With the saw-blade properly sharpened, set, and hammered the face of the crowding-wheel in contact with the saw should be tangent to a vertical plane exactly parallel with the face of the fence G. With the saw hammered concave on the side toward G or having insufficient set on the side next the press-roll, so that there is insuflicient clearance between the same and the roll, there would be a tendency to press the saw-blade toward the fence. The crowdingwheels should then be alined so that that portion of the crowding-wheel which presses against the saw-blade near the toothed edge should be slightly farther from the plane of the guiding-face of the fence G than that portion of the crowding-wheel which engages and supports the band-saw blade at its back edges.

In the diagram, Fig. 7, the line G G represents the face of the fence G. The curved line S represents the saw, of which the face next to the fence G is concave. Now it is always the toothed edge of the saw-blade which guides the saw, and thus to present the toothed edge ofthe saw T properly to the material being sawed that portion of the saw between T and Q must be practically parallel with the line G G. This of course will necessitate the cross-lining of the crowding-wheels, so that the general position of the face of said crowding-wheels in said contact with the saw occupies the position H H.

In the foregoing specification I have described a lateral adjustment of the wheel; but it is to be understood that the term is used with reference to the side of the saw and applies both to an arrangement in which the cutting portion of the blade is vertical and to an arrangement in which the blade is horizon, tal, in which case the lateral adjustment or adjustment to and from the side of the sawblade would be in a vertical instead of a horizontal plane.

What I claim as my invention is 1. A revolving saw-guide having refuse-receiving recesses extending circumferentially around its working face and separated by narrow ridges that engage the surface of the saw.

2. A revolving saw-guide having a working face provided'with refuse-receiving pockets separated by narrow ridges that engage the surface of the saw.

3. The combination with a band-saw of a crowding-wheel provided with refusereceiving grooves on its working face separated by narrow ridges or projections so disposed as not to break the continuity of the working circumference of contact between the wheel and saw, as and for the purpose described.

4. The combination with a band-saw of a crowding-wheel provided with pockets or recesses and intermediate ridges or projections adapted to support the saw at all times at some point on a line across the saw where it is a tangent to the periphery of the working face 0 the wheel.

5. In a band-saw machine, a guide-wheel bearing laterally against the cutting portion of the saw and mounted in a vertically-tiltable support combined with means for adjustin said support so as to swing the axis of the wIieel in a plane perpendicular to the plane of the saw-blade, as and for the purpose described.

6. In a band-saw the combination with a guide-wheel bearing laterally against the saw- Signed at Saginaw, in the county of Sagiblade of means for tilting the axis of the naw and State of Michigan, this 3d day of wheel in a plane parallel to the saw, means January, A. D. 1905.

for swinging the axis of the wheel in a plane EDWARD O. MERSHON. 5 transverse to the blade of the saw and means Witnesses:

for adjusting said wheel bodily toward and B. C. BINGHAM,

away from the saw. CLAYTON BROWN.

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