US493001A - Buffing-roll - Google Patents

Description

(No Mode1. H. A..WBBST.BR.

BUPFING ROLL.

No. 493,001. Patented Maan-1, 1893.

' INVENTUR:

UNTTEE STATES PATENT OFFICE.

HAROLD A. WEBSTER, OE HAvERHILL, ASSIGNOR To GEORGE H. P. ELAGG,

' OE BOSTON, MASSACHUSETTS.

BUFFIN'G-ROLL.

SPECIFICATIONforming part of Letters Patent No. 49 8,001, dated March 7, 1893. Application filed October 18, 1892.. Serial No.449121'7. (No model.)

To a/ZZ whom t may concern:

Be it known that I, HAROLD A. WEBSTER, of Haverhill, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Bufting Rolls or Cylinders, of which the following is a specilication.

This invention has for its object to provide a bufting roll or cylinder having an abrasive periphery yieldingly supported by a constantly maintained air cushion; and it consists in a bufting roll or cylinder composed of a rotary shaft having an internal airpassage and peripheral rings or collars, and a yielding covering supported by said collars, the said covering and the end collars constituting an air chamber, which receivescompressed air from an air pump or forcing apparatus, and keeps the yielding covering suitably distended and yieldingly supported, the yielding covering having a facing or coating of a suitable abrasive material,such as sand-paper'.

Of the accompanying drawings, forming part of this specification: Figurelrepresents a longitudinal section of a buttng roll embodying my invention, showingA the bearings which support the shaft of the roll. Fig. 2 represents a section on line 2-2, Fig..1, looking toward the right. Fig. 3 represents a section on line 3 3, Fig. 1. Fig. 4 represents a side elevation of an organized machine embodying my invention.

The same letters and numerals of reference indicate the same parts in all the figures.

In the drawings: a represents a rotary shaft, which is journaled in suitable bearings b b, and is provided with a longitudinal air channel b', which may be connected in any suitable way with an air pump or forcing apparatus. I have here shown a pipe c, communieating with a chamber b2 in one of the bearings b, said chamber-communicating with the air passage b. The pipe c extends from a suitable air pump, not shown. Said pump may be driven by the power that rotates the shaft a, so that, when the shaft and cylinder are in operation, there will be a constant supply of air to keep the bufting surface of the cylinder properly-supported.

d d represent collars or heads, preferably of rigid material, affixed to the shaft, and d repare provided for detachably securing the" Vabrasive sheet or layer 3, said means, as here shown, being a wedge-shaped bar e, extending lengthwise ofthe cylinder and formed to tit in notches f formed in the heads d. The inner thickness 2 of the exible covering is permanently pressed into the notches f, the

portion thus displaced constituting a V-' shaped trough, extending lengthwise of the roll. In securing the outer abrasive layer` 3, the bar e is rst removed and the sheet of abrasive material is Wrapped around the permanent inner layer2, and then tightened and secured by forcing the bar into the said trough, portions of the abrasive sheet being forced into the trough with the bar, as indicated in Figs. 1, 2 and 3. The ends of the bar are oftset and provided with ears o r lugs e e', which are engaged with cams e2, which are adapted to rotate on collars e3 formed on the heads d. By turning said cams in one direction, the bar e is drawn inwardly, While by turning said cams in the opposite direction the bar is released and its removal is permitted. It will be seen that, when air under pressure is forced into the air chamber thus formed, it presses outwardly on the flexible covering, and thus constitutes a yielding and constantly-maintained cushion supporting the abrasive material.

When the roll is of considerable length, so that the pressureof the article to be buffed or treated upon the yielding periphery of the roll would tend to unduly sink or displace said periphery, I provide one or more yielding supports for the said periphery, at points between the end collars or heads d d. Said yielding supports are preferably disks t' t', of felt or other similar material, secured to the IOO , having an air passage, headsorcollars affixed` to said shaft, anda yielding or ,flexible `cylin.- drical covering affixed to said heads and pro- .l vided with an abrasive coating, said heads' and flexible .covering inclosing an air space4 shaft a by means of iianged collars t" i', and

clamping plates 2 secured by belts t3. kThe yielding disks e7 are of such diameter that they do not extend out to the inner surface of the yielding covering when the latter is in its normal position, and particularly when it is distended by the internal air pressure, .the object t of said disks being to furnish a yielding sup- 3 port for the abrasive material inthe event of extreme displacement of the latter by external pressure.

It Will be seen that, by providing a bufng roll with an air cushion which is constantly l maintained when the roll is in operation, Ii greatly simplify the construction of the roll and make it more durable and effective for bufling purposes than rolls made as heretofore in which the abrasive material 'is cushioned Wholly by felt or other like material.

In Fig. 4, I show the improved bning rolls mounted upon a central shaft, which is jour- I? naled in bearings in a supporting-frame j.` The air pump which supplies the internal i pressure in the buiing rolls may be aiiixed to 1 said frame, if desired. l

I do not limit myself to the described .dey tails of construction, and may vary the same Without departing from the spirit ,of Iny iny vention.

I claim-,-

I. A buflng roll, comprising a rotary shaft communicating with air passage in the shaft, combined with means Ywhereby air under pressure may be admitted into said passage to press outwardly and yieldingly support the flexible covering, as set forth.

2. A buing roll comprising a rotary shaft having an air passage, heads or collars affixed to said shaft, a yielding cylindrical covering aixed to said heads, said covering and heads constituting an air chamber communicating l with the passage in the shaft, and one or more yielding supports aiixed to the shaft within said chamber, as set forth.

3. A buiing yroll comprising a rotary shaft having an air passage, heads or collars affixed to said shaft, an inner iexible covering permanently attached to said head, and means fOI deffachably 4securing an abrasive covering t0 Said inner covering, as set forth.

4. A `;b uiilng roll comprising a rotary shaft, heads or collars axedthereto and provided lwith notches, a flexible .covering axed `to Said heads and entering said notches, a `Wedgeshaped bar formed t0 enter 'Said notches as a :means for detachably securing an abrasive covering, and rotatable cams engaged with the ends of said bar, as set forth.

In testimony whereof l have signed my name to this specification, in the presence of two subscribing Witnesses, this `15th day of October, A, D, 1892.

HAROLD A. WEBSTER. Witnesses: LG. F. BROWN, M. W. JACKSON.

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