US17537A - Automatic sawmill-block - Google Patents

Description

. nivrrEi) sTATEs PATENT oEEioE.

HIRAM VELLS, OF FLORENCE, MASSACHUSETTS.

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AUTOMATIC SAWMILL-BLOCK.

Specification of Letters Patent No. 17,537, dated June 9, 1857.

To all who/m tz' may concern."

Be it known that I, Hman WTELLS, of Florence, in the county of l-Iampshire and State of itlassachusetts, have invented a new and useful Automatic Head-Block for SawmilleCarriages; and l do hereby declare that the same is described and represented in the following specification and drawings.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation, re ferring to the drawings in which the same letters indicate like parts in each of the figures.

Figure l, is a plan of my head block on a carriage. Fig. 2, is a side elevation of the same. Fig. 3, is an end elevation.

The nature of my invention consists in certain devices which traverse the log toward the saw simultaneously on each head block, and set it automatically, or permit the workman to set the log on either head block, or on all the headblocks at the same time by vibrating a single lever.

In the accompanying drawings A, is the floor of the mill, B, B, the ways for the carriage to traverse on, consisting of the sides C, C, and end bars D, D, fastened together in the form shown with some cleats E, E, under the bar D, to lit and traverse against the ways B. The head block F, lies across the carriage and is provided with the cleats G, G, which tit against the sides C, and the head block may be fastened to the side by some convenient means which may be provided for that purpose. This head block F, has a groove in it to which the rack H, with ratchet shaped teeth is fitted to traverse when operated by the segmentgear I, which meshes in the gear teeth J, on the side of the rack. The segment gear I, and lever K, are in one piece and vibrate on the screw L, in the stand M, fastened to the block F, as shown in the drawing.

rThe sides of the groove in the head-block F, are cut dovetailing, and the base of the knee N, is tted to traverse in it, which knee is made in the form shown and provided with three pawls P, shown in Fig. 3, which pawls are arranged to catch into the rack H, successively so that if the rack H is moved one-third of the distance or space between two teeth, one of the three pawls falls into the rack, so that the knee N may be traversed one-third of the space between two teeth of the rack, or a much larger distance each time the lever K is vibrated toward the head block to traverse the knee and log toward the saw. The hand lever O is fitted to vibrate on a screw in the knee N, and its lower end is bent, so as to pass under the pawl P, and raise them up and hold them clear of the rack H, when the lower end of the lever is vibrated from the pivots of the pawls, so that the knee may be traversed or pushed back to the rear end of the head block. vWhen the knee N is traversed as near the saw as it is proper for itto go, the spring Q. stops the end of the lever O and the pawls pass onto it and are raised clear of the rack and the knee stops, when it may be pushed back and the lever O vibrated to let the pawls down, so that the rack will carry the knee forward again. The spring R, on the knee N, presses against the lever O, so as to hold the lever in such position as it may be placed when in use or out.

I have described the devices which may be used to traverse the knee and set the log by hand, and I will now describe the parts connected to them to traverse the knee and set the log automatically.

The bar S is arranged to traverse in stands T, T, on the side C, and has the slide U titted, so that it may be traversed upon it, and fastened at the point desired by a set screw, which slide has a swivel head V, with a score in it for the lever K, so as to vibrate the lever when the bar S is traversed in the stands T, T. The stand W' is fastened to the floor A for the bolt X to traverse in, which bolt is forced up by a spiral spring in the lower part of the stand; the face of the stand that covered the spring being omitted in Fig. 2 to show the spring. The bolt X has a cam lever (L on its face by which it may be drawn and held down when desired. There is a projection b, on the bar S, which bar should be so set that when the log being sawed is run back so as to clear the saw the projection b will stop against the bolt X, and as the carriage continues to move, the lever K is vibrated and the knee N traversed forward, so as to set the log a proper distance for a new cut. The swinging cam c on the carriage should be so set that when the knee has moved the log the distance required for a new cut the cam will run onto the pin d, in the bolt X, and push it down, so that the projection Z) will pass over the bolt and the knee will remain stationary in the head block. The

.the bar S. There are some stops L, L, on

the stands of the swinging cams, so arranged that one of the cams pushes the bolt YX down when the carriage is moving' 1n one direction and the other when the carriage is moving in the opposite direction. These cams c, and j', are swung up by the pin d, alternately and pass over it without depressing the bolt X. By varying the distance between the swinging cams c and f, the knee N may be made to set the log being sawed more or less, or such distance as may be desired to make the lumber sawed the thickness required.

I contemplate that the carriages for my automatic head blocks may be made ot such a lenffth as may be desirable, and provided with 2two 'or more head blocks, and that the bar S may be made to extend the whole length of the carriage and provided with a slide like U, with a swivel for a lever like K from each head block, so arranged that by traversing the bar S the knees in the Vseveral head blocks will be moved simultaneously to set the log on the carriage automatically, and that when it is desirable to set or move the knees one at a time, the levers like K may be lifted out of the swivels and vibrated by hand to traverse the racks and knees, and that when it is desirable to traverse all the knees simultaneously by hand to set the log, the cam lever a may be swung to hold the bolt X down out or' the way of the projection. b, and the lever g may be moved toward the carriage on its fulcrum to bring the gear on the lever into the rack 7c, on t-he bar S, so that by vibrating the lever g the bar S may be traversed to move the knees and set the log, or if it is desirable to move one or a part of the knees on the head blocks by moving the lever g, the levers K may be raised outk of the swivel heads of the knees that are to remains stationary so that they will not be moved when the bar S is traversed by the lever g. I also contemplate that the carriage may be traversed by rack and pinion or such other devices as may be preferred for that purpose.

I believe I have described and represented my automatic head block for sawmill carriages, so as to enable any person skilled in the art to make and use it.

I will now state what I desire to secure by Letters Patent, to wit:

I claim the devices substantially such as are herein described, ortheir equivalents, so constructed as to traverse the log toward the saw simultaneously on each headblock, and set it automatically, or permit the workman to set the log on either headblock or on all at the same time by the lever g when put into gear with the rack K as described.

` HIRAM WELLS. Witnesses:

I-IIRAM STEBBINS, S. L. HILL.

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