IMPROVEMENTS IN MACHINERY OR APPARATUS EMPLOYED FOR THE CUTTING OR SAWING OF TIMBER
Year: 1874

page_text: LETTERS PATENT to John Kirkland and James Anderson, both of
Dundee, in the County of Forfar, North Britain, for the Invention
of "IMPROVEMENTS IN MACHINERY OR APPARATUS EMPLOYED FOR THE
CUTTING OR SAWING OF TIMBER."
.
Sealed the 30th October 1874, and dated the 8th June 1874.
PROVISIONAL SPECIFICATION left by the said John Kirkland and
James Anderson at the Office of the Commissioners of Patents,.
with their Petition, on the 8th June 1874.
We, JOHN KIRKLAND and JAMES ANDERSON, both of Dundee, in the
County of Forfar, North Britain, do hereby declare the nature of the
said Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS EMPLOYED FOR
THE CUTTING OR SAWING OF TIMBER," to be as follows, that is to say:―
This Invention which relates to improvements in machinery or
apparatus employed for the cutting or sawing of timber consists of a
saw frame which moves in angular slides fixed to and supported by an
upright framing. The driving motion is communicated by belting to a

page_text: crank shaft to which the saw frame is connected, and on the same shaft
is a fly wheel and rope pulley; this rope pulley carries the motion to
other ropes and belt pulleys of various sizes which drive the feeding
rollers on which the timber to be cut is laid, thereby giving continuous
motion to the timber. The reciprocating saw frame carrying the saws
and moving in the angular guides is thereby enabled to cut both with
the downward and upward motion alternately, so that every stroke made.
by the frame is a cutting stroke, the saw teeth being made or shaped to
cut on both strokes.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Kirkland and James Anderson in the Great
Seal Patent Office on the 5th December 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
KIRKLAND, and JAMES ANDERSON, both of Dundee, in the County of
Forfar, North Britain, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of June, in the year of our
Lord One thousand eight hundred and seventy-four, in the 37th year
of Her reign, did for Herself; Her heirs, and successors, give and grant
unto us, the said John Kirkland and James Anderson, Her special
license that we, the said John Kirkland and James Anderson, our
executors, administrators, and assigns, or such others as we, the said
John Kirkland and James] Anderson, our executors, administrators, or
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 MACHINERY OR APPARATUS
EMPLOYED FOR THE CUTTING OR SAWING OF TIMBER," upon the condition
(amongst others) that we, the said John Kirkland and James Anderson,
by an instrument in writing under our hand and scal, should par-
ticularly 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

page_text: filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said John Kirkland and James
Anderson, do hereby declare the nature of our said Invention, and in
what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, reference being had
to the accompanying Drawings and to the letters and figures marked
thereon, that is to say :-
Our said Invention which relates to improvements in machinery or
apparatus employed for the cutting or sawing of timber consists of a saw
frame containing one or any suitable number of saws and working
between slides fixed to an upright framing. Reciprocating motion is
communicated to the saw frame by means of a crank shaft which may
be driven from a belt passing around a pulley fixed thereon, and from
the said crank shaft a continuous motion is imparted to the feed rollers
of the machine by means of a train of wheels, pinions, and pullies,
whereby the timber being sawn is fed continuously through the machine
instead of intermittantly as hitherto, the saw teeth being shaped so as to
cut both in the upward and downward strokes.
A feature of this Invention is the connecting of two or more saw
frames to the same crank shaft, the cranks being set at different angles
so as to distribute the strain upon the crank shaft.
And in order that our said Invention may be properly understood we
now proceed more particularly to set forth the system, mode, or manner
in or under which the same is, or may be used, or practically carried
into effect, reference being had to the annexed Sheet of Drawings, and
to the letters and figures marked thereon, that is to say :-
Figure 1 on the annexed Sheet of Drawings is a vertical section of a
saw frame constructed in accordance with our said Invention; Figure 2
is a horizontal section of the same at the line a, b, Fig. 1; while
Figure 3 is an elevation of the machine seen from the side marked A,
Fig. 1.
The working parts of the mechanism are supported by an upright
framing B, near the upper part of which is situate the crank shaft C:
supported in bearings D and driven by a belt E from the fast pulley P
of the fast and loose pullies F, G, near which and upon the same shaft:

page_text: is also fixed the fly wheel a. At Fig. 1 the crank c is represented as
at half stroke, while at Fig. 3 the stroke is shewn as completed," the:
crank disc d being set opposite to the crank c, but in practice it is pre-
ferred to set the different cranks at such angles to each other as will
best distribute the torsive strain upon the crank shaft.
Although in the Drawings two saw frames H and I are represented as
connected to the crank shaft C, it is to be understood that one or any
greater number than two of such saw frames may be employed. The
saw frames H and I are connected to the crank shaft C by connecting
rods J, K, and work in slides L fixed to the framing B. Any required.
number of saws (two, M, N, being shewn on the Drawings) are secured
in each of the frames H and I, the teeth of the said saws being shaped-
so as to cut both at the upward and downward strokes. Continuous
motion is imparted to the feed rollers O from the crank shaft C, upon
which is fixed a pulley P. A rope or belt p passes around the pulley P
and also around a larger pulley (not shewn on the Drawings). Upon
the axis of the said second pulley is fixed a smaller pulley which drives
the pulley Q (Figs. 1 and 2) by means of a rope or belt R. A step.
pulley S is fixed upon the shaft T of the pulley Q, around which and,
also around another step pulley U a belt V is passed. Upon the same
shaft W which carries the step pulley U a spur pinion X is fixed
gearing with the spur wheel Y running loosely upon the shaft Z,
and having formed upon or attached to it a clutch e. Another clutch f
upon the same shaft is caused to revolve therewith by means of a slip
feather and groove or other means, whereby it is allowed to slip upon
the shaft in and out of gear with the clutch e. Upon the shaft Z is also
fixed a spur pinion 9 which gears with the spur wheels h situated on
cach side of it; these spur wheels are fixed to the same shafts i which
carries the hercin-before mentioned feed rollers O which are thereby
actuated.
The machine is supplied with the usual spring pressing rollers k, the
pressure of which may be adjusted by the screw l.
The method of operating our Invention is obvious. The machine
being set in motion the timber to be sawn (represented by the dotted
lines m, Fig. 1, and in full lines at m, Fig. 3) is fed continuously.
beneath the pressing rollers & to the saws M, N, by the feeding rollers O,
the saw teeth being shaped to cut at the upward as well as at the down->
:

page_text: ward stroke, and the timber being fed continuously thereto, both strokes
of the saw frames are thereby utilized, a saving of power being thus
effected.
Having now described and particularly ascertained the nature of our
said Invention and the system, mode, or manner in or under which the
same is or may be used or practically carried into effect, we would
observe in conclusion that what we consider to be novel and original,
and therefor claim as the Invention secured to us by the herein-before
in part recited Letters Patent is,-
.
First. The arrangement and construction of saw frames whereby saws
driven by power are enabled to cut both on the upward and downward
strokes, substantially as herein-before described and shewn.
Second. Constructing the teeth of saws driven by power with a cutting
edge on both sides, whereby they are enabled to cut on both the upward
and downward strokes, as herein-before described and shewn.
Third. The arrangement of continuous feeding motion, substantially
as herein-before described and shewn.
In witness whereof, we, the said John Kirkland and James
Anderson, have hereunto set our hands and seals, this Third
day of December, One thousand eight hundred and seventy-
four.