US76471A - John l - Google Patents

Description

@einen tatrs atrnt @ffice Letters Patent No. 76,471, dated April T, 1868.

IMPROVEMENT IN SAW-MILLS.'

fgehltle referat tu im tlpse tfittctt ditant mit uniting gmt tt tige smite.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN L. KNOWLTON, of Philadelphia, in thecounty'ol` Philadelphia, and State of Pennsylvania, have invented a new and improved Sawing-Machine; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to makeand use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to a new and improved machine for sawing timber in straight, curved, or bevelled form, and is an improvement on a machine for the same purpose, patented by me, October 20,1863, and reissued September 12, 1865.

The `object of the present invention is to render the machine better adapted for the sawing of crooked or curved timber, such ns is used for ship-building, and while effecting this result, to obtain simplicity in construc tion, a greater facility otv manipulation, and a less cumbersome machine than usual. In the accompanying sheet of drawings- Figure 1 isa front sectional View of my invention, taken in the line :c x, tig. 2.

'Figure 2, a horizontal section ofthe same, taken in the-line y y, g. 1. i y K Figure 3, a detached vertical section of a part pertaining to the same, taken in the line z z, iig. 4.

Figure 4, a. horizontal section oi" Eg. 3,V taken in theline e a.

Similar letters of reference indicate corresponding parts.

A represents a. frame, which supports a horizontal bed, B, said frame having two uprights, d d, to which horizontal bars b 6 are attached, onev at some distance above the other, as shown clearly ing. 1.

To these bars b b' there is permanently bolted, or otherwise secured, asegment, G, of Wood or metal; cast iron lwill probably be used. This segment is provided or cast yvith a flange, c, which extends out from it at i right angles, and concentric with it; and in the exterior surface ot' this tiange there is made a. groove, d, to receive friction-rollers, which are secured to axsegmcnt, D, to admit of D moving freely on C, and securing the former to the latter. Y

The exterior of the segment D is toothed, to receive a screw, E, through theV medium of'which the segment C is turned. v

The segment D has saw-guides F F attached to it, in line with each other, anc in a positiony radial with the segment, said guides having slides G G fitted within them, to which the ends ofthe saw I-I are attached.-

The slides G Gr are secured tothe inner ends of levers I I, by means of connecting-links z" t" which serve, as the saw is operated, to keep the sides ofthe slides parallel with the sides of the guide'sF, in order to prevent the former from being twisted or crampedin the guides. The fulcrafof the levers are on the segment D, and

the outer ends of the levers are connected by a rod, J, the ends work in swivel-nuts g, lin the outer ends ofthe levers.

It will be seen from the above description that, by turning the rodJ, the saw H may be strained or kept at a proper degree of tension at all times. This will lie-fully understood by referring to g. 1.- 'A

The advantage of this arrangement consists in the dispensing Withthe comparatively heavy and cumberd sonic saw-sash, used in my original machine, and admitting of the saw being more readily strained than hitherto. This is an important feature ofthe invention,l as it economize's in the construction of the machine, and reduces jars and concussione, and consequent wear and tear.

of which are provided with screw-threads, to

The sawII works through a slit or hole in the hole in the hed B, and the segments C and D admit of timlv bers being turned to any given angle relatively with the saw, and also of very crooked timber being sawed, as the ends of thc segments are so placed that the open 4space aX between their ends is over the bed B. This is also an important feature ot' the invention, ,as the original machine has its saw-gate attached to a plate which forms a complete circle, and this plate worked on a guide, which also forms a complete circle. i

In the original machine,l therefore, a. stick of timber cannot be turned on the bed B, back of the plane in which the segment C is placed, nor can a stick of timber be conveniently sawed which is quite crooked, as timber for the knees'ot` vessels, for insta-nce. By my improvement a stick of timber, in being sawed, maybe turned around nearly in an entire circle in a horizontal plane, and to facilitate this adjustment of the timbers, I use annular ways I for the carriages or trucks to Work or move on. A portion of these Ways is shown in fig. 2

By means of these annular ways, therefore,iand the open space a ,kthe sawingot` crooked timber, more especially ship-timber, is greatly facilitated.

J represents the feed-wheels by which the timber is fed to the saw, and K is the pressure-roller above it.v

The feed-wheels` are rotated froma horizontal shaft, L, by means of bevel-gears 71. and an upright shaft, z', two feed-wheels'JX JX being used, and placed on -a shaft', j, (see fig-4.) This shaftj has its bearings in a yoke, M, attached to a sleeve, N, which-is iitted loosely .on the upright shaft z', so that it may turn freely thereon. The lower part of this sleeve has a toothednvheel, k, upon it, into which a rack, Z, gears, said rack being itted in suitable guides, so that it may slide freely'therein. By adjusting or moving this rack l, the feed-wheelsJ JXv may be turned so as to coincide with the direction designed tobe given the timber in its movement towards the saw. Thisit will beseen, is essential, as the Wheels JX J feed the timber to the saw, and it is owing to the position of said wheels'(the planes in which they rotate relatively with'the saw) that the vfeed-movement of the timber has the proper direction given it. V i v By the arrangement of the feed-wheels as above described, they may be adjusted with the greatest facility by the operator.

The above-described improvements render my original patented machine far more desirable and valuable than hitherto, :is-they not only `facilitate the manipulation of the machine while in operation, but render the same capable of performing Work which cannot be conveniently done with the original one.

I claim as new, and desire to secure by Letters Patentl Y 1. The guides F, slides G, connecting-links z" z", pivoted levers I I, and cennec'ting-rod'J, in combination with the smv H, all arranged and operating as described, 'for the purpose specified. b

2. The construction and arrangement of the segments C D, the former having the opening 1X for the purpose, substantially as described. 1

3. The rack Z, and pinion K, in combination with the sleeve N, yoke M, and feed-rollers JX, as herein described, for the purpose specified.

' JOHN L. KNOWLTON.

Witnesses:

`CrniRLns B.'MITGHELL,

WM. F. HELMS.

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