US177018A - Improvement in sanding-machines - Google Patents

Description

o. s'AWYEYR, A. & H'. c. KNoWL'roN.

SANDIN'G-MACHINE.

Patented May Z, 1876.

N. PETERS. FMOTO-LITNOGRFHEH. WASHINGTUI'. D C.

oLivEE s AwYEE, on wiNeHENDoN, AND AUeUsTUs KNowLroN AND HENRY. ogKNowLroN, 0E GARDNER, MAssAoHUsETTs.

l IMPROVEMENT IN SANDlNG-MACHINES.

Specification forming part of Letters Patent No. 177,018, dated May 2, 1876 application led October 19, 1875.

To all whom yt may concern:

Be it known that we, OLIVER SAWYER, of Winchendou, and AUGUSTUS KNowLToN and HENRY C. KNoWLToN, of Gardiner, Yin .the county of Worcester and State of Massachusetts, have invented certain Improvements in Sanding-Machines, of which the following is a specification In the accompanying drawing, forming a part of this specification, Figure l represents an end elevation oi'a machine embodying our invention; and Fig. 2 is a front elevation of the same.

rlhis inventionlrelates to that class of smoothing or sanding machines in which a belt coated with sand or emery is employed for smoothing dat surfaces, the belt being supported, at the point where it operates on the stock, by a pulley having an elastic periphery. l

The invention has for its object to provide means whereby pieces of dat stock of differerent degrees of thickness can be presented to the smoothing-belt at the point where it is supported by the elastic pulley, and sanded on one side alone, by the employment of ene smoothingbelt, or on both sides simultaneously, by the employment of two smoothingbelts. To this end oui` invention consists in the combination of feed-rolls and sand-beltsupporting pulleys, which we will now proceed to describe, and point out in our claim.

In carrying out our invention we employ a frame-work, A, adapted to support the oper ative parts of our invention. Bv represents a belt coated with sand or emery in the usual manner. P D represent the pulleys on which the belt is supported and driven. The pulley P we term the bearing-pulley, the same being located in such relation to the feed-rolls hereinafter described as to constitute a bearing or support for the belt Bl at the point where it operates on the stock presented to it by said feed-rolls. The periphery ofthe bearing-pnl ley is made of any suitable yielding or elastic material-such as cloth, rubber, Ste-and forms a bearing for the belt B sufficiently Vyielding' to prevent the coating ot' the belt from being held positively against the surface to be sanded. R R R' R' represent feed-rolls,

which are preferably rubber-coated, and arelocated with their axes substantially parallel with the axis of the bearing-pulley P. These feed-rolls are arranged in such relation to the bearing-pulley P that a piece of stock passing between them will be subjected to the action i of the belt B at the point where it is supported by said bearing-pulley. The rolls R' lt' we prefer to locate in yielding bearings, so as to admit ot' the introduction of pieces of stock of different thicknesses between said rolls and the rolls R R, whose bearings are stationary, suitable devices being employed for imparting a yielding pressure to the rolls R' R' in the direction of the rolls R R, as will be hereinafter described. The motive power may be applied to either of the pulleys P D. We prefer to connect the bearing-pulley' P to the prime motor, and locate the pulley D in a swinging frame, F, which is provided with a weight, W, the latter tending to draw the pulley D away from the pulley P, and thus tighten the belt.

It will be seen that a dat piece of stock presented by the feed-rolls to the belt in a direction at right angles with the axis ot" the bearin g-pulleywill be acted on uniformly by the supported portion ofthe belt,the stock bein g passed along by the rolls until it is sanded from end to end. The elastic peripheryof the bearingpulley prevents the rapid destruction ofthe coatiugof the belt which would result if the pulley had a rigid periphery.

We have thus far described an adaptation of parts for sanding one side oi' a flat piece of stock at a time. For operating simultaneously on opposite sides of a flat piece we employ an additional belt, B', bearing-pulley P', and tightening-pulley, D', these parts being substantial duplicates of thebelt B and pulleys P D, and so located as to cause the belt B' and bearing-pulley P' to assume the same relation to the feed-rolls It' lt' that the belt B and pulley P sustain to the feed-rolls It R, the belt B' being thus caused to operate on one side of the stock, while the belt B operates on the opposite side, the axes of the pulleys being parallel. rlhe pulley P' and feed-rolls R' R' have their bearings in a block or carriage, C, which is adapted to slide vertically in suitable ways. T is a weighted arm or lever, which exerts an upward pressure on the car e V nuns riage C and its attachments, and holds the' bearing-pulley P' and belt B with a yielding l pressure against the stock to be smoothed, thus adapting the machine to operate on stock of` dierent thicknesses. The tightening-pulley D' is journaled in a swinging weighted frame, F', which operates 'substantially like theframe F of the pulley D.

By this invention we are enabled to rapidly, economically, and uniformly sand pieces of stock having flat surfaces, and of dierent'de grees of thickness.

We do notlimit ourselves to the employment of both beltsB B', as either maybe dispensed with, if desired; neither do We limit ourselves` -l to the employment of the tightening-pulleys D D', as any suitable arrangement of pulleys may be employed in connectionwvith the elastic bearing-pulleys and any suitableI heltltight- .i `i ening devices may be substitutedfor the swingl ing weighted framesfwithout departing Vfrom the spirit of our invention.

We claim- In a sanding machine,- the combination of the feed-rolls B R, located in fixed bearings, and thefeed-rolls R' R', located in yieldingbearings, with the pulley P locatedin fixed bearings, and supporting the sand-belt B, or with i thepulleys P P'located, respectively, in fixed fand yieldingbearings, and supporting the belts B B', substantially as described, for the .Purposes specified.

Intestimonywhereofwe have signed our names to this specication in the presence of two 'subscribing Witnesses.

OLIVER SAWYER. AUGUSTUS KNOWLTON. HENRY C. KNOWLTON.

Witnesses THATCHER; B. DUNN, JN0; ,4 HEYWooD.

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