US124524A - Improvement in saw-fviills - Google Patents

Description

Improvement in Saw` Mills;

V124,524,Pammd'wuirch12,1872;.

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N0', 1.245524, Pate'ntedMarch 112, 1872.

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SAMUEL WEYMOUTH, OF WILLAMSPORT, ASSIGNOR TO H. F. SNYDER AND G. S. SNYDER, OF SAME PLACE, AND ANTES SNYDER, OF FREEPORT, PA.

IMPROVEMENT in saw-MILLS.

To all whom it may concern:

Be it known that I, SAMUELWEYMOUTH, of NVilliamsport, in the county ot' Lycoming, State of Pennsylvania, have invented certain new and useful Improvements in Saw-Mills, of which the following is aspecilication:

The invention relates to reciprocating sawmills, and more especially those in which many. saws are mounted side by side, known as gangsaw mills. It consists of improvements in various parts of the framing1 and the mounting of the rolls which transport the log.

The following isa description of what I consider the best means of carrying out the invention. The accompanying drawing forms a part otl this speciiication.

Figurel is a sideelevation of the mill, showing the series of supporting-rolls in position, but with thet'ramin g therefor omitted; a-nd Fi g. 2 is a front elevation. The scale ofthe above is three-eighths inch to one foot. The remainin g tigures show, on alarger scale, the hinges which connect and disconnect the binder rolli'ranies. and the upright rods on which they are guided. Fig. is an elevation; Fig. 4, an end view; and Fig. 5, a plan view. The scale Ot' these is one-halt' size.

Similar letters of reference indicate like parts in all the igures. The drawing represents the novel parts, with so much of the' ordinary parts as is necessary to indicate their relations thereto.

A A are upright `trames, of castiron, and A1 A1` are later-.ll frame-pieces, ot' the same lnaterial, rigidly iixed thereto in the positions represented. They support the entire structure on the posts A2. The feed-rollers B B are mounted in bearings in these fame-peces, and perform their usual functions of slowly moving forward the log, which is pressed down thereon. The means for holding down the. log and for supporting it at other points are peculiar, but the feed-rollers themselves involve no novelty. A3 A3 and A4 A4 are smaller side frames, firmly liXed on the framing A above the feed-rolls, and supporting between them stout cylindrical rods, A5, which rods carry the framings for the binding-rolls, and allow the latter to be raised and lowered at will, and, under proper conditions, to be swung around out of the way in order to allow access to the saws. The binder-rolls are indicated by D D. They are mounted in binder-frames E, which embrace the vertical guide-rods A5, by mea-ns of corresponding hollow cylindrical bearings, which may be opened and closed at will, as indicated by El E2. (See Fig. 5.) One-halt' of each bearing is formed in the parts El, which are fixed on the main body of the frame E;

The other haltl is formed in the parts or straps E2, which are secured to the parts El by knuckle-joints e and bolts and keys el e2. (See Figs. 3, 4, and 5.) When the mill is in condition for use, all these bearings are made to einbrace their respective rods A5, and the only motion of which the fra me E is susceptible is a simple rising and sinking, vertically. But when it is desired to get access to the saws, for sharpening'. setting, exchanging, or the like, the frame E and its connections are swuu g out ot' the way by disconnecting it from one of the vertical rods A5, and causing it to swivel around upon the other. To et't'ect this operation, the key c2 is driven out ofthe bolt e1 from both ot'l the bearings on one side ot' the frame E, and the corresponding straps E5 are swung open in the position shown in dotted lines in Fig. 5. This liberates the frame. E from its connection to the vertical guide A5 on one side, and allows it to swing around on the single vertical guide on the other side, turning on it as a hinge. To hold it up when in this condition, I secure upon each guide A5 a stout collar, A, as shown in Figs. l and 2. One of these collars may be secured at any desired elevation by means of a set-screw, A12, as rep'- resented, and the weight ot' the binder-frame and its contents bears on and is supported -by it as itswings around, after being set tree 'from the other guide A5. Over each collar A11 I mount a stout ring or hollow cylinder, of rubber, as indicated by A13. It is of no ei'ect under any ordinary conditions; but when, in consequence of any accident, the binder-frame is allowed to drop or to descend too rapidly, these springs soften the concussion. To raise and lower the framing E and its connections, when in use, I provide a cranked shaft, F, mounted in suit-able bearings therein, and a rope, f, which, as the crank is turned, is thereby unwound from a large drum, G', mounted on a shaft, G, supported in the tixed framework above. The slow turning of this shaft G by this means winds up larger ropes or chains, g, which run around sheaves in the framing E, and hoist or lower the hinding-rolls and their connections, as may be required. In practice, the whole or a greater portion ot' the weight ot' such framing E and its connections is usually allowed to bear on the log through the medium ofthe hinder-rolls Dx. It will be understood that these ropes are disconnected, or are set tree, by allowing the shalt F to unwind when the frame E is to be swung' around out of the way. There are two ot' these frames E, with the corresponding binder-roll and pro` visions for hoisting and swinging around. One acts on the log in front of the saws, and the other in the rear of the saws. Both contribute to hold down the log against the considerable litting force which is liable to be felt when the saws rise. The carrying-rolls should be made as light as is consistent with strength and durability. I prefera construction in which the main cylindrical surface is lap-welded iron tubing, and the ends cast-iron; but this is not absolutely essential. I attach great importance, however, to the arrangement of the bearings in which they are supported, so that they shall hold the log in a slight curve; or, in other words, shall cause each log to bear very lirmly at each end. To edect this, I adjust the bean ings in a curved line, as shown in Fig. l. The upper surface of the feed-rolls B B are lower than the upper surfaces of the nearest adjacent carrying-rolls. The neXt carryingrolls proceeding outward toward the end oi" the log are a little higher, and the next or succeeding a little higher yet. The arrangement is clearly shown in Fig. l. The curvature. ot' the log should not be carried to such an extent as to prevent the binder-rolls from holding the log firmly down on the feed-rolls, but only to such an extent as to insure a solid bearing of the ends ofthe logs upon the rolls which are under them. Substantially the same effect of holding the upper sides of the rolls in such relations may be eii'ected by having the rolls of gradually-increasing size toward each end ot' the series, and placing their bearings in aline; but I prefer rolls of uniform size, as shown. Chains may, of course, be used instead of ropes, to raise the bindent'ra-mes by the means shown.

lSome of the advantages due to certain featuresof my invention may be separately enumerated, as follows: First, by reason of the arrangement of the supporting-rolls, so that the feed-rolls at the center are the lowest, or the supporting-rolls held under each end ofthe log are a little higher, the log is made. to press lnore rmly than usual on the rolls which support its ends, and is thereby more firmly held against displacement laterally. The swiveling around ot' the log` is a serious evil in some sawing, and is always liable to occur, even with the most nicely-prepared saws and the strongest pressure on the binder-rolls. This arrangement ot' the supporting-rolls aids much to ameliorate the evil, and the logs will feed through my saw-mill in mathematical rig-ht lines under reasonably favorable conditions. Second, by reason, ot' my bolts e1 and keys e2 serving, as represented, relatively to the joint or hinge c and straps E2, and cylindrical guides A5 and collar A with adjusting means A, I am enabled to connect and disconnect the trame E and swing it around very rapidly, at any desired elevation, with little llabor or skill. Third, by reason ot' my springs A, fitted, as

shown, under the binder-frame E, I diminish the risk of fracture in case the binder-frames and their connections are allowed to descend too rapidly from any cause.

I claim as my invention- 1. The supporting-rolls, arranged as represented, so as to hold the log with a slight ver tical curvature, and adapted to serve rela` tively to the `teedrolls, and binder-rolls, and saws, as herein specified.

2. The movable frames E and their contained mechanism, mounted on the cylindrical gnidebars A5, over the feed-rolls B B, adjacent to the saws, the adjustable collars A and con- {innig-keys A12, and the hinged straps E2 turning on the joints c, and confined and released to allow the turning ofthe frames E to obtain access to the saws without complete separation of the straps, all substantially as herein specified.

3. The springs A13, arranged as shown, and adapted to soften the fall ofthe binder-frames E, as herein specified.

In testimony whereof I have hereunto set my name in presence ot' two subscribing witnesses.

SAML. WEYMOUTH.

Witnesses:

J. D. SNYDER, T. U. Roenes.

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