US295303A - Saw-mill - Google Patents

Description

(No Model.)

. 2 Sheets-Sheet 1. J. M. STORY.

SAW MILL,

Patented Mai. 18; 1884,

I N f.

N. Puma n-uwmm mm. wmmgmmc.

Nrrn TATES J QSEPPLM. STORY, OF SPRING CITY, TENNESSEE.

SAW-MILL.

SPECIFICATION forming part of Letters Patent No. 295,303, dated March 18, 1834.

Application filed March 26, 1883. Renewed January 24, 1884. (No model.)

To (:LZZ 2071,0711, it. may concern:

Be it known that I, Josnrrr M. STORY, a citizen of the United States, residing at Spring City, Tennessee, have invented new and useful 5 Improvements in Sawing Lumber, of which the following is a specification.

My invention relates to circular saw mills employed in cutting logs into boards, its object being to improve their efficiency and economy 1 of operation; and to this end it: consists in a novel construction of such mills, embodying also anovel principle of operation conducing to efficiency.

The essential principle of myinvention consists in giving to the log a vertical and horizontal movement in relation to the saw by suit able mechanism controlling the carriage.

The remaining features of myinvention con sist of the construction and arrangement of QC mechanism employed in carrying outthe above stated principle, all as more fully set forth herein.

A convenient form of mechanism embodying my invention is illustrated in' the accompany 5 iug drawings, in which Figure 1 is an end view of the saw-mill, showing the relative positions of the various parts. Fig. 2 is a side elevation sectioned vertically through the carriage; Fig. 3, a detached View of aportion of the carriage and one of its yokes and driving-pinion, showing details of construction by apart section of the yoke longitudinally; Fig. 4, a cross-section of one of the yokes, showing its construction in relation to 5 the bearing-rollers and d riving-pinion; and Fig. 5, a partial face view of the saw, showing the segmental plates bolted to the hub.

Referring to the drawings, inwhich the parts described are indicated byv letters of referao'encc, A designates the floor of the mill; B, the

tical and longitudinal motion in relation to the saw. A preferable construction is to secure upon the bottom of the carriage four supporting guide-yokes, E, arranged in pairs at each end of the carriage. These yokes are curved, as shown in Fig. 1, and extend downward over two parallel horizontal shafts, F F, rotating in bearings beneath the floor A. By means of the rotation of these shafts motion is given to the carriage through spur-pinions a at each guide-yoke meshing in a line of cog-teeth, or rack, 1), formed centrally in the lower interior face of the yoke. Each pinion a is flanked by two flanged friction-rollers, d (1, running loosely upon the shaft, and upon these rollers the yoke bears by means of bearing-rails e, flanking the rack b as part of the yoke. The construction of the yoke and of its interior faces will be readily understood by reference to Figs. 3 and 4.

The shafts F F are driven by worm-gear G, arranged in suitable bearingsbeneath the floor, engaging spur-pinions G upon the shafts, the worm-shaft G being driven by reversible friction-gear in any convenient manner. A prefer able construction of the'frictiongear is a pivoted frame, H, carrying two parallel shafts, 7z-,pro vided with frictionwheels f, driven in opposite directions by belting from a counter-shaft, h. The pivoted frame H is mounted in a support ing-frame, l, and so arranged that its frictionpulleys f may, by the oscillation of the frame H, be thrown alternately into driving contact with a friction- 'nilley, G, upon the worm-shaft G, which oscillation is effected by ahand-la ver, K, and suitable connections under control of the attendant.

The operation is as follows: The parts being in the position shown in Figs. 1 and 2 and the log (indicated in Fig. 2 by dotted lines) being secured to the headblocks upon the carriage, forward motion is given to the shafts F F by means of the friction and worm gear. The first effect of the movement is to carry the log downward upon the saw indicated in Fig. 2 by dotted lines) and to open the kerf at the end of thelog, and then, by reason of the curved contour of the guide-yokes E, to carry the log forward across the upper are of the saw. A reversal of the movement restores the carriage to its original. position, ready for the next out.

The carriage is arranged to have both aver- IOC Beneath the platform D, adj acent-to-the saw, a system'of rollers, L, is arranged, with a suitable spreader, Z, to open the kerf as the cant goes forward and guide the board into posi- 5 tion upon the rollers.

WVhile I have shown-the saw arranged below; the carriage and the latter operated downward upon it, it will be obvious that a reversal of the process may be efi'ected by arranging the saw above the carriage and feeding the work upward to the saw. The advantages of this construction are many and obvious. I The linear travel of the carriage is reduced, the'grav-l ity of the carriage and log assists the work,

.andby the increased rotative speed of thesawteeth. a much smoother board is obtained. Moreoveiythe' construction of the saw and its high. circumferential speed enables the use of i much thinner sheets of metal for the-segments,

than are ordinarily employed, and the loss of material in. the kerf is materially reduced, and .any injury to the saw may be repaired iIJGX pensively by replacing one or more segments. r If found necessary, an additional supportingshaft, F, may be employed to preserve a proper balanceof the carriage, orthe two described. may be placed in such position as to-"better attain this object, or the yokesentirely dispensed with and: the carriage operated upon' suitably- 3o inclined guideways by chain gear or other mechanism. x v

I: claim as my invention and desire to secure by Letters Patent i y Y -1. The combination, substantially as before 3 5 set forth, of the log-carriage and mechanism, substantially such as described, for-propelling the same, whereby in feeding the log'to the saw the .simple horizontal movement of said I carriage is" preceded by a compound vertical and horizontal movement thereof.

2. In a circular saw mill, a log-carriage provided with curved supporting-yokes, adapted to be propelled and guided upon fixed shafts to givethc log both a vertical and horizontal movement in relation to the saw, substantially as set forth. '3; In combination with the carriage B, the curvedsupporting-yokes E,having the interior face at one or both sides formed as'bearingrails, and thedepressed surface between the rails formed asa-rack, and the supportingshafts F F, provided with spur-pinions and friction-rollers, substantially as specified.

4. In combination with'a" log-carriage-pro- 'vided with guide-yokes and shafts, upon which *thesame are guided and driven, the ieversf ble worm and friction gear, substantiallysueli 'as described, for imparting reversible motion to the carriage as set forth. -5. The construction and arrangement, in a saw-mill, of a circular saw journaled beneath the floor, and operating upward through'the same, a carriage having both a vertical and horizontal movement in relation to the saw,

and mechanism, such substantially as described, for supporting, guiding, and operating the carriagennder control of the attendan't, substantially as set forth. I

' In testimony whereof I have hereunto set my hand in the presence of two subscribing wit nesses. y

. J. M. STORY.

Witnesses:

L. M. Hosm, LOUIS F. SCIIUERMAN.

Images