Taran TW BAND SAWS
Year: 1873

page_text: LETTERS PATENT to Charles Robert Western, of the Victoria Works,
Belvidere Road, Lambeth, in the County of Surrey, for the Invention
of 16 Taran TW BAND SAWS
"
Sealed the 15th April 1873, and dated the 19th February 1873.
PROVISIONAL SPECIFICATION left by the said Charles Robert Western
at the Office of the Commissioners of Patents, with his Petition,
on the 19th February 1873.
I, CHARLES ROBERT WESTERN, of the Victoria Works, Belvidere
Road, Lambeth, in the County of Surrey, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN BAND SAWS," to be as
follows:-
This Invention relates to the construction and arrangement of band
saws and their framing in such a manner that the saw can be readily
adjusted to make an oblique cut, and also to the construction and

page_text: arrangement of springs for band saws, so as to give an elastic tension
with facility of adjustment.
The mode usually adopted for causing band saws to make an oblique
cut is to mount the table on which the wood to be cut is laid on an axis,
so that it and the wood upon it can be canted to the required angle,
while the saw continues to run in a vertical line.
The novel method which I adopt is to mount one of the two saw
pullies in a framing, which can be moved laterally, so as to cause the
line of the saw to make the required angle with the table. The move-
ment of the pulley for this purpose is by preference effected in the arc
of a circle, struck from the centre of the other saw pulley, the axis of
which remains fixed for convenience of driving. Thus the distance
between the pullies and consequently the length and tightness of the
saw remain unaltered by the lateral movement of the one pulley.
The frame on which the moveable pulley is mounted may be fixed to 1
radius rods, which can sweep round the axis of the other pulley, or may
work in a curved slot or on curved guides provided on the framing.
As it is more easy to make a slot or guides and a slide to work therein
straight than curved the following arrangement may be adopted with a
straight slot or straight guides:-The moveable saw pulley is mounted ?
on a vertical slide provided with an adjusting screw and spring, whereby
the saw can be tightened; and this vertical slide is fitted to a block
made to slide in the straight slot or guides. When the block and pulley
are moved laterally the alteration of the length of saw, caused by the
pulley moving in the chord instead of the arc of the circle, can be
allowed for by the adjusting screw and spring.
As the obliquity of the desired cut is sometimes greater than could be
conveniently obtained by the lateral movement of one of the saw pullies,
as above described, I prefer to make the table also capable of being
.canted in the ordinary manner. Thus the obliquity of the cut may be a
determined by either the lateral movement of the pulley or by the
canting of the table, or by both combined.
The spring which I adopt for band saws is like an ordinary carriage
-spring, the ends of which either rest upon a plate or are linked to horns

page_text: attached to the block or framing on which the upper saw pulley is
mounted. The adjusting screw by which the pulley is raised or lowered
passes through the middle of this spring, and is provided with a hand
wheel above forming the nut of the screw, which wheel bears on the
upper side of the spring. By turning the hand wheel in the one direction-
or the other the strain upon the spring and consequently the tension of
the saw can be readily adjusted.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Charles Robert Western in the Great Seal Patent
Office on the 11th August 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
ROBERT WESTERN, of the Victoria Works, Belvidere Road, Lambeth, in
the County of Surrey, send grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Nineteenth day of February, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Charles Robert Western, Her special
license that I, the said Charles Robert Western, my executors, adminis-
trators, and assigns, or such others as I, the said Charles Robert Western,
my executors, administrators, and assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
BAND SAWS," upon the condition (amongst others) that I, the said Charles
Robert Western, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar mouths next
and immediately after the date of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said Charles Robert Western, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, reference being had to the accom-
panying Sheet of Drawings, and to the figures and letters marked
thereon, that is to say :-
This Invention relates to the construction and arrangement of band
saws and their framing in such a manner that the saw can be readily
adjusted to make an oblique cut; and also to the construction and
arrangement of springs for band saws, so as to give an elastic tension
with facility of adjustment.
The mode usually adopted for causing band saws to make an oblique
cut is to mount the table on which the wood to be cut is laid on an axis,
so that it and the wood upon it can be canted to the required angle,
while the saw continues to run in a vertical line.
The novel mode which I adopt is to mount one of the two saw
pullies in a framing, which can be moved laterally, so as to cause the
line of the saw to make the required angle with the table. The move-
ment of the pulley for this purpose is by preference effected in the arc
of a circle, struck from the centre of the saw pulley, the axis of which
remains fixed for convenience of driving. Thus the distance between
the pullies and consequently the length and tightness of the saw remain
unaltered by the lateral movement of the one pulley.
The frame on which the moveable pulley is mounted may be fixed to
radius rods, which can sweep round the axis of the other pulley, or may
work in a curved slot or on curved guides provided on the framing.
As it is more easy to make a slot or guides and a slide to work therein
straight than curved the following arrangement may be adopted with a
straight slot or straight guides:-The moveable saw pulley is mounted
on a vertical slide provided with an adjusting screw and spring, whereby
the saw can be tightened; and this vertical slide is fitted to a block
made to slide in the straight slot or guides. When the block and pulley
are moved laterally the alteration of the length of saw caused by the
pulley moving in the chord instead of the arc of the circle can be allowed
for by the adjusting screw and spring.

page_text: As the obliquity of the desired cut is sometimes greater than could
be conveniently obtained by the lateral movement of one of the saw
pullies, as above described, I prefer to make the table also capable of
being canted in the ordinary manner. Thus the obliquity of the cut may
be determined by either the lateral movement of the pulley or by the
canting of the table, or by both combined.
The spring which I adopt for band saws is like an ordinary carriage
spring, the ends of which either rest upon a plate or are linked to horns
attached to the block or framing on which the upper saw pulley is
mounted. The adjusting screw by which the pulley is raised or lowered
passes through the middle of this spring, and is provided with a hand
wheel above forming the nut of the screw, which wheel bears on the
upper side of the spring. By turning the hand wheel in the one direction
or the other the strain upon the spring and consequently the tension of
3 the saw can be readily adiusted

page_text: Fig. 4 shows a modified arrangement of the spring H in connection
with the sliding block D and the screwed spindle d and hand wheel h.
In this case the spring H is inverted, and is linked at its ends to radius
rods e, e, mounted on the projecting cars of the block E. For traversing
the block E along the slot in the framing F there is provided a hand
wheel K with a pinion working along a rack k fixed to the hinder side
of the frame F; and the spindle on which the wheel K revolves is
screwed at the end and provided with a tightening nut and handle L..
It will be seen that when it is required to saw wood obliquely the
handle L being slacked the hand wheel and the pinion K can be turned,
and the block D, carrying with it the block E and pulley C, can thus
be made to traverse along the curved slot in F until the saw is brought
to the desired degree of obliquity to the table, and the saw being then
worked by driving, the lower pulley B will cut obliquely through the
wood M placed on the table G. The obliquity of the cut may be still
farther increased by mounting the table itself on an axis g, so that it can
be canted out of level. The table so canted being provided with guide
segments N having slotted holes with a tightening bolt and nut n can
be held securely at the desired inclination.
It may be readily understood that by providing sufficient length of
slide for the block D, along the block E, and of the adjusting screw d,
the block E might be made to traverse in a straight slot or in a slot of
curvature other than that already described, the variation of radial
distance from the centre of B being allowed for by screwing down or up
the hand wheel h.
It is also to be understood that the arrangement for adjustment of
tension of the saw by means of a sliding block D, carrying the upper
pulley provided with a screwed spindle d, wheel h, and spring H,
mounted either as shown in Fig. 1 or in Fig. 4, is applicable to band
saws generally, even if they are not arranged for altering obliquity a
of cut.
Having thus described the nature of my Invention, and in what
manner the same is to be performed, what I claim is,―
First. Mounting one of the pullies of a band saw so that it can be
moved laterally, substantially in the manner and for the purpose herein 3

page_text: Second. The use for band saws of a spring in combination with a
sliding block and adjusting screw, whereby the tension of the saw can
be adjusted, substantially as herein described.
In witness whereof, I, the said Charles. Robert Western, have
hereunto set my hand and seal, this Eleventh day of August,
in the year of our Lord One thousand eight hundred and seventy-
three.