IMPROVEMENTS IN BAND SAWING MACHINERY
Year: 1877

page_text: LETTERS PATENT to George Knowling, of the Firm of Polyblank and Company,
of Kingswear, in the County of Devon, Mechanical Engineer, for the Inven-
tion of IMPROVEMENTS IN BAND SAWING MACHINERY."
Sealed the 22nd January 1878, and dated the 26th November 1877.
PROVISIONAL SPECIFICATION left by the said George Knowling at the Oflice
of the Commissioners of Patents on the 26th November 1877.
GEORGE KNOWLING, of the Firin of Polyblank and Company, of Kingswear, in
the County of Devon, Mechanical Engineer. "IMPROVEMENTS IN BAND SAWING
MACHINERY."
The improvements consist in construcling band sawing machinery in such fashion
that when the saw is canted the bed shall travel in a horizontal position, and
thereby avoid the strain on the saw, and shifting the timber from its place on the
table.
Also in adjusting the tension of the band saw or of band saws generally by means
of a pivoted arm or bracket carrying the upper pulley actuated by a screw bedded
on a spring support placed on a fixed rest.
The Invention can be performed by canting the saw by means of a screw, worm,
and wheel, or other mechanical contrivance, working on, in, or against a moveable
metal frame carrying the pulleys actuating the saw band, said moveable frame being
journalled at its lower end and on the same centre as the bottom pulley. The table
is moved by the same motion actuating the moving frame, which is for that purpose
connected with it.
The tension adjustment can be performed by constructing the brackets of metal
or other material, furnishing one bracket with a spring bed, on which one end of
the screw works, the other end abutting against the pivoted arm carrying the saw
pulley, so that the turning of the screw separates the pulleys.
The adjustment can also be effected by slinging one or more weights to the
pivoted arm, or actuating it by levers or other mechanical contrivances.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Knowling in the Great Seal Patent Office on the 22nd May
1878.
66
GEORGE KNOWLING, of the Firm of Polyblank and Company, of Kingswear, in
the County of Devon, Mechanical Engineer. IMPROVEMENTS IN BAND SAWING
MACHINERY."
The improvements consist in constructing band sawing machinery in such fashion
that when the saw is canted, the bed shall travel in a horizontal position, and
thereby avoid the strain on the saw, and shifting the timber from its place on the
table.
Also in adjusting the tension of the band saw or band saws generally by means
of the pivoted arm or bracket carrying an upper pulley actuated by a screw bedded
on a spring support placed on a fixed rest.
The Invention can be performed by canting the saw by means of a screw, worm,
and wheel, or other mechanical contrivance, working on, in, or against a movable
metal frame carrying the pulleys actuating the saw band, the said moveable frame
being journalled at its lower end and on the same centre as the bottom pulley. The
table is moved by the same motion actuating the moving frame, which is for that
purpose connected with it.
The tension adjustinent can be performed by constructing the brackets of metal
or other material, furnishing one bracket with a spring or sliding bed on which one
end of a screw works, the other end abutting against the pivoted arm carrying the
saw pulley, so that the turning of the screw separates the pulleys and tightens
the saw.
The adjustment can also be effected by slinging one or more weights to the lower
arm or actuating it by levers or other mechanical contrivances.
The accompanying Drawing will show a convenient and practical mode of
performing the improvements, and will speak for itself, Fig. 1 being a front
elevation and Fig. 2, a side elevation; but I do not bind myself to the precise mode
therein illustrated, as the mode of performing the Invention can be varied without
departing from the nature thereof.
In witness whereof, I, the said George Knowling, have hereunto set my hand
and seal, this Eighteenth day of May, in the year of our Lord 1878.
GEORGE KNOWLING. (L.S.)
Kingswear,
Dartmouth,
Devon.