US147390A - Improvement in sawing-machines - Google Patents

Description

UNITED STATES PATENT OFFICE.

GEORGE S. GRIER, OF MILFORD, DELAIVARE.

I IMPROVEMENT IN SAWING-MACHINEIS.

Specification forming part of Letters Patent No. 147,390, dated February 10, M74; application filed November 17, 1573,

To all whom it may concern:

Be it known that I, GEORGE S. Game, of Milford, in the county of Kent and State of Delaware, have invented anew and Improved Sawing-Machine and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure 1 is a side elevation, partly in section. Fig. 2 is a cross-section in line w :12, Fig. 1. Fig. 3 is a cross-section in line y Fig. 1.

The invention relates generally to machines for sawing timber, but more particularly to those for preparing ship-timber and cutting out irregular forms.

It will first be fully described, and then pointed out in the claims.

A represents the base, and B therisers, having top concavities b, in which turn the are bars a of the saw-table O.

In cutting irregular forms it is very important that the table shall turn upon an invariable axis or center of motion, and I, therefore, cause the table G to depend at each end from a bent rod, D, journaled in a middle upright, E, and in the same perpendicular plane as that in which the saw moves. Vhen cutting straight timber, where both ends do not require to be manipulated-by separate persons, 1 find that there is a tendency in the timber to slip. To avoid this I construct the ends and cross-pieces of table with ratchets F F, having teeth inclined inreverse directions from the middle, whereby the piece of timber may be braced from each side in a sure and efl'ectual manner by pieces that rest with one end against the log, and with the other against a tooth of ratchet.

G G are two short friction-rolls arranged in the same frame 9, and placed at one or both ends of table, so that, as the log is gradually moved in a lateral direction over. the table, the two rolls may turn in difi'erent directions to accommodate the diiierential motion of the two longitudinal divisions of the timber. The frames g may be adjusted across the table by screws 9 and the traveling nuts 9 Where only one roll is employed, it cannot turn at all with the lateral motion of the log, but compels the movement to be made against sliding friction, which is very objectionable. H H are the feed-rolls, provided with spikes that bite into the wood, and the lower end of them with a wheel or crank, by which they may be caused to turn. I is a metallic frame, in which are slots that receive the roller-shafts. By means of the lower long slots and clamp-screws, the

frame may be raised or lowered to accommodate different thicknesses of timber, while, by means of the upper short slots, the upper roll may be held by the yielding pressure of a spring upon the log that is passing.

Feed-rolls made adjustable, and one of them pressed to the article fed by a spring, form I am aware, old devices; but the peculiar construction and application of my spring is believed to be new. I employ a plate-spring, Q, bent from the middle toward each end, which end is turned to form the bearing of top roll. It is riveted, or otherwise securely attached, at its middle, to the top of frame I. This is a very simple spring, easily made, cheap, and durable. To the table I attach a movable bow-rod, J, having one end held by each side of table, and provided at the middle of the bow with the pointer K, that is threaded and works adj ustably in a corresponding vertical thread of the rod. Above this,

1 and attached to the posts L L, 011 which slide up and down the saw-frame M, I place the transverse scale-plate N, on which is marked the perpendicular row 0 of notations, from 0, or zero, to any preferred figure of designation.

1? P I I? are rows of notations, each in the are of a circle described from the longitudinal axis of the table as a center, but on different radiuses.

The operation of the machine is as follows: Before the timber is out there is made a draft, by which the lines of separation are clearly defined. The lines of out are then denoted on the scale-plate N by turning the table until the pointer K is brought into the same plane with the saw and of the zeromark of scale. It the cut is to be made in a piece of timber eight inches thick, the pointer K is adjusted until its end reaches number or figure 8; if a two-inch plank, then the end of pointer is extendedto number2, and so on,upward or downward,to suit the thickness of timber to be sawed. This scale-plate is intended to serve as a gage,

by which the chief workman may direct the others in the gradual lateral adjustment of the timber on the table. Of course, if the saw makes its initial cut at any given distance from the edge of timber, and is intended to run out at the corresponding subjacent edge, the obliquity of the line of cut will vary with the canting of the log, on the table; hence the log must be turned laterally on the table for the saw to follow the curved line as it is fed up to the saw. The timber to be cut is of equal thickness throughout, and from two to twelve inches thick. The log is manipulated, in practice, by three men, one being placed at each end to turn it laterally on the table, while a third one causes the table to cant and works the feed-roller, in the usual manner. I

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The ratchets F F, one on each end of ta ble, and I each having the teeth inclined reversely from the middle, as and for the purpose set forth.

2. The combination of two rollers, G G, the frame 9, placed transversely across a sawingmachine table, and the adjusting device 1 as and for the purpose specified.

3. The combination, with adjustable pointer K, connected and moving with the table, of stationary scale-plate N, having the vertical row 0 of notations and the series of arc-rows P P P P, as and for the purpose set forth.

\Vitnesscs: GEORGE S. GRIER.

J. YOUNGER GRIER, Josnrn RICHTER.

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