US761344A - Gang-saw mill. - Google Patents

Description

No.761,344. PATENYTED -Y 31,;1.904.- w. M. WILKIN. GANG SAW MILL.

APPLIGATION FILED APR.18. 1903.

N0 MODEL.

TH: NORRIS PETERS 00., mom-urns" WASHINGTON, n c.

Patented May 31, 1904.

PATENT OFFICE.

WILLIAM M. WILKIN, OF MOBILE, ALABAMA.

GANG-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 761,344, dated May 31, 1904.

Application filed April 18, 1903. Serial No. 153,238. (No model.)

To all whom it may concern} a Be it known that I, WILLIAM M. VVILKIN, a citizen of the United States, residing at Mobile, in the county of Mobile and State of Alabama, have invented certain new and useful Improvements in Gang-Saw Mills; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this-specification.

My invention relates to gang-saw mills; and it consists, substantially, in certain new and improved features therein and the combinathem in quarter-sawing lumber and in sawing two small logs at the same time. To overcome these difliculties, I construct each of the press-rolls of the gang with one or more annular V-shaped grooves, and on the center of the press-roll yokes I mounta third roll provided with a V shaped groove, so that the grooves in each of the rolls are adapted to engage the edge of a quarter-sawed or the rounded upper surface of a small log, as the case -may be, and effectually prevent its tipping sidewise while passing under the press-rolls and being sawed. To further contribute to this result, I place a cylinder across the front of the mill provided with cutters projecting up to the top of the feed-rolls of the mill, which operates as the quarter-log or round log is moved under the press-rolls and upon the feed-rolls of the mill to skive off the bottom of the quarter-log or log, so that when it passes upon the feed-rolls of the mill this flattened surface rests upon and is engaged by them and serves to prevent the log or quarter-log from rolling thereon.

Another feature of my invention is'in the construction and combination, with the mill, of an improved log-feedway for carrying quarter-logs or logs into the mill. v

The features of my invention are hereinafter fully set forth and explained, and illustrated in the accompanying drawings, in Which v Figure 1 is a front end view in elevation of my improved gang-saw mill with the log-feedway removed. Fig. 2 is a sideview in elevation of the same with sections of thelog-feed- 7 way. 7

In the drawings illustrating my invention, A is the frame of the mill, B the'saw-sash provided with saws b, C the crank-shaft, O

the driving-pulley thereon, DD the pitmencranks, D D the pitmen connecting the pitmen-cranks D D with the saw-sash B, E the counterweight-crank, E the counterweights swin in on arms E pivoted to su ports 0' on the base of the frame A, e the counterweight-pitmen, F F the feed-rolls, and G G H H h h thefeed-roll-operating mechanism,

all of which are of the usual and ordinary construction.

On the edges ofthe frame A, I provide removable guides I I, upon which I mount pressroll yokes J J adapted to slide up and down freely thereon, and on rocking levers K, centrally pivoted in the press-roll yokes J, I mount auxiliary press-roll yokes] J J, moving freely up and down in recesses in the main nular V-shaped grooves Z, adapted to engage the upper edges of different-sized quarterlogs, as illustrated in dotted lines in Fig. 1, so that both may be sawed at the same time. On

the center of the press-roll'yokes J, I also.

mount short press-rolls L, with a V-shaped peripheral groove therein adapted to engage the upper edge of a larger quarter-sawed when the press-roll 'yokes J are moved up, as is also illustrated by dotted lines in Fig. 1f, the object of the V-shap'ed grooves in the press-rolls being to engage the upper edgesaor corners of quarter-logs, so that they will .be firmly held upright while being sawed.

For operating the press-roll yokes J J, I mount steam or compressed-air cylinders M in the base of the frame A, one on each side thereof, from the piston-rods m of which links m extend to arms a on rock-shafts N, mounted in the frame A below the plane of the feed-rolls F F, and from the arms a a on the rock-shaft links n extend up at each side of the frame A to studs [7' on the ends of the press-roll yokes J J, by means whereof the press-roll yokes J J and the mechanism thereon are actuated by the pistons of the cylinders M M, as is shown in another application filed herewith and pending therefor. At the front of the mill I mount a transverse cuttingcylinder 0, having cutters 0, preferably staggered, on the periphery thereof which extend up to the plane of the tops of the feed-rolls F F, and on the frame A under the pressrolls L L on the same plane with the feedrolls F F, I mount an auxiliary feed-roll O, driven by a sprocket-chain f from one of the feed-rolls F and adapted to support the end of the quarter-log or legs until they pass upon the regular feed-rolls F F. On the periphery of the feed-disk G, .I place a band-rim g, from which a belt g extends to a pulley O on the end of the shaft of the cylinder 0 and operates to drive the same. In the drawings I have shown the bearings 9 of the cylinder 0 mounted on brackets P P on the mill-frame; but it is obvious that, if desired, the bearings of the cylinder 0 may be mounted on suitable supports independent of the mill-frame or on vertically adjustable supports on the millframe or otherwise, as the cylinder 0 will in either case perform its function with equal facilityviz. the skiving off of the under surface of the quarter-logs or of ordinary round logs, so that they will present flattened bearing-surfaces to the feed-rolls F F, thereby preventing their rolling or tipping laterally thereon.

In front of the mill and of the cylinder 0, I secure a log feedway comprising trackstringers Q, secured upon foundations Q. The stringers Q are cut away on their upper surfaces back from the cylinder 0 a sufficient distance to receive the wheels of the front logcar, hereinafter referred to. Upon the stringers Q, I secure rails R, so as to form a track eurvlng downward at the outer end 9 of the depression therein and curving upward at the opposite end (1 of said depression, so as to operate as a stop for the car-wheels and prevent the car from contacting with the cylinder 0. The log-cars operating on said tracks R are ordinary trucks having transverse bearing-beams T and provided with flanged wheels 25, adapted to operate on the tracks R. In operation the quarter-logs or logs are loaded upon the trucks T T when standing on the level portion of the track R,-but with the end of the quarter-log or logs next to the mill projecting some distance beyond the truck thereunder. The quarter-log or logs being then moved toward the mill, the cylinder 0 skives off the under surface of the front end. of the log, as illustrated by dotted lines in Fig. 2, and when the end of the log has passed upon the auxiliary feed roll 0' the front truck passes down into the depression of the track and the log rests upon the auxiliary feed-roll O and the rear truck, when the press-rolls are brought down upon it and it passes on upon the feed-rolls F F and is fed through the mill in the usual manner.

Having thus shown and described my invention, so as to enable others to construct and use the same, what I claim as new, and desire to secure by Letters Patent of the United States, is

' 1. In a gang-saw mill, the combination of a mill-frame, a saw-sash and mechanism for operating the same mounted in said frame, feed-rolls mounted in said frame, press-roll yokes mounted on guides on said frame, pressrolls having V-shaped annular grooves therein mounted in said press-roll yokes, a leveling cutter-head operating on the under surface of the log and actuating mechanism in the base of the mill-frame connected with and operating the press-roll yokes, substantially as set forth.

2. In a gang-saw mill, the combination of a mill frame a saw -sash, counterbalanced mechanism operating said sash, feed rolls mounted in said frame, press roll yokes mounted on guides on said frame, two pressrolls, having V shaped annular grooves, mounted in said press-roll yokes, a third and central V-shaped press-roll mounted on the center of the press-roll yoke, and actuating mechanism mounted in the base of the millframe, connected with and operating the pressroll yokes, substantially as set forth.

3. In a gang-saw mill, the combination of a mill-frame a saw-sash mounted therein, a main driving-shaft mounted in the base of the mill-frame, pitmen-cranks therein, pitmen connecting said cranks with the lower portion of the saw-sash, a eounterbalance-crank in said shaft, counterbalance-weights on arms pivoted to the base of the mill-frame, a pitman connecting the counterbalance-crank with the counterbalance-weights, feed-rolls mounted in the mill-frame, an auxiliary feed-roll mounted in the front of the mill-frame on the same plane as the regular feed-rolls, pressroll yokes mounted on vertical guides on the mill-frame, press-rolls mounted therein, rockshafts mounted in the mill-frame below the plane of the feed-rolls, links connecting the ends of the press-roll yokes with arms on said rock-shafts, steam or compressed-air cylinders mounted in the base of the mill-frame, links connecting the piston-rods of said cylinders with arms on said rock-shafts, a transverse eylinder mounted in front of the idlerroll in the mill-frame, staggered cutters on said cylinder the peripheries of which are on IIO a plane with the tops of the feed-rolls, mechanism for actuating said cylinder, a log-feedway having a portion of the track thereof adjacent to the mill-frame depressed, and trucks on said feedway-track, substantially as set forth.

4. In a gang-saw mill, comprising substantially a mill-frame, a saw-sash and mechanism for operating the same, feed-rolls, press-roll mechanism, and a transverse cutter-cylinder in front of the mill-frame the top vof which is on a plane with the tops of the feed-rolls of the mill, a log-feedway, a track thereon having a portion of it adjacent to the cutter-cylinder depressed below the general planeof 15 *passage into and through the mill substan- 20 tially as set forth.

In testimony whereof I affiX my signature in presence of two witnesses.

WILLIAM M. WILKIN.

Witnesses:

W. R. WILKIN, 4 WM. H. ARMBREOHT.

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