US138901A

US138901A - Improvement in veneer-cutting machines

Info

Publication number: US138901A
Authority: US
Publication date: 1873-05-13
Anticipated expiration: 1890-05-13

Description

1. w. LESLIE & e. B. SMITH;

Veneer Cutting Machines.

$10,138,901. I PatentedMay13.1873-.

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AM PHOTO-LITHUGRAPHIL' an my (oseaavs FRGLESQ} UNITED STATES PATENT OFFICE.

JOHN w. LESLIE AND GEORGE B. SMITH, 0E CAIRO, ILLINOIS.

IMPROVEMENT IN VENEER-CUTTING MACHINES.

Specification forming part of Letters Patent No. 1 38,901, dated May 13, 1873; application filed March 15, 1873.

To all whom it may concern:

Be it known that we, JOHN W. LESLIE and GEORGE B. SMITH, of Cairo, in the county of Alexander and State of Illinois, have invented a new and useful Improvement in Veneer-Guttin g Machines, of which the following is a specification:

Our invention consists in the employment of a pressure-roller so small that the curvature of the periphery will admit of the application of the pressure exactly opposite the edge of the cutter, with two secondary pressure-rollers acting upon it to make up the capacity for pressure, in which it is considerably reduced by being made so small. The object is to lessen the checking of the wood, which is considerable in the machines using only one roller,

because the size necessary for strength makes the curvature so large that the point of contact with the wood must be considerably in front of the cutting edge, so that the real object of the pressure-roller is not accomplished, because the wood is not subject to pressure at the point where the checking takes place-that is, immediately over the edge of the cutting blade.

The drawing represents our arrangement of pressure-rollers, and the cutter in cross-section in full lines, and the log to be cut in dottedlines. A represents the cutter, and B the log to be out, as they appear in the machines in which the log is revolved on pivots against a cutter, which is on stationary supports and feeds it up to the log as it is reduced. 0 is the small pressure-roller, such as we propose to use, arranged to bear upon the surface of the wood just at the point where it begins to rise, as it is separated from the log by the enough to have the requisite strength for pressin g the wood with suflicient force would necessarily have a curvature greater than that of the veneer where it separates from the log and rises up to pass over the knife, so that the bearing-point on the log would be removed considerably forward of the cutting edge, leaving the surface where the checking occurs unprotected. This is entirely corrected by our improvement.

We are aware of the patent granted to J. G. Brown, dated March 26th, 1872, and desire formally to disclaim all that is shown or described by him.

Having thus described our invention, we claim as new and desire to secure by Letters Patent A small pressure-roller, 0, arranged to bear upon the wood directly above the edge of the cutter, with the re-enforcing pressure-rollers acting upon it substantially as speclfied.

I JOHN W. LESLIE.

Witnesses:

H. LEIGHTON,

H. O. LOFTIN.

GEORGE B. SMITH.

Witnesses:

I E. W. FoSDIoK,

E. L. FOSDIOK.