IMPROVEMENTS IN SAWING MACHINERY
Year: 1874

page_text: LETTERS PATENT to John Hall and William Hall, both of Wilford
Street, in the Town and County of the Town of Nottingham, for
the Invention of "IMPROVEMENTS IN SAWING MACHINERY."
Sealed the 2nd October 1874, and dated the 29th May 1874..
PROVISIONAL SPECIFICATION left by the said John Hall and William
Hall at the Office of the Commissioners of Patents, with their
Petition, on the 29th May 1874.
We, JOHN HALL and WILLIAM HALL, both of Wilford Street, in
the Town and County of the Town of Nottingham, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN SAWING MACHINERY,”
to be as follows:-
The object of the Invention is when using a continuous feed for the
material to be cut with the teeth of cutting blades set to cut in opposite
directions from the centre to the ends, to means by which to obtain
increased freedom and accuracy of working. For this purpose the guides
for guiding the traverse of the saw frame are set at angles in place of

page_text: parallel to the direct line of the cut, the inclines of these guides being
such as to cause the end for the time cutting progressively to advance to
its work whilst the opposite or back end retires therefrom. The extent
of angle adopted will be varied with the speed of feed employed. By
thus arranging the guides for the opposite ends of the saw frame at
angles one to the other in place of in the same plane, the saws clear
themselves better, allowing every tooth to do its own proportion of work
with great uniformity, without jamming during the times the crank pins
giving motion to the saw frames are passing their dead centres.
We obtain uniformity in the setting of these guides by hanging their
inner ends on pivots, with capability of setting by set screws, and
applying pins or projections at the opposite ends of them to pass into
inclined slots in plates capable of being slided by screw or other motion,
and connected together by ordinary gear for simultaneous action or such
like motion; or in place of the screw and inclines to act on the guides
we sometimes employ eccentrics connected by lever and links. This
eccentric arrangement is particularly applicable to when the saws cut
vertically, as it is more readily connected with the means for varying the
speed of the feed.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Hall and William Hall in the Great Seal
Patent Office on the 28th November 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wе, JOHN
HALL and WILLIAM HALL, both of Wilford Street, in the Town and
County of the Town of Nottingham, send greeting.
.
:
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-ninth day of May, in the year
of our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said John Hall and William Hall
Her special license that we, the said John Hall and William Hall, our
executors, administrators, and assigns, or such others as we, the said
John Hall and William Hall, our executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and

page_text: .
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 SAWING MACHINERY," upon
the condition (amongst others) that we, the said John Hall and
William Hall, our executors or administrators, by an instrument in
writing under our or their hands and seals, or under the hand and seal
of one of us or them, 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 months next and immediately after the date
of the said Letter's Patent.
NOW KNOW YE, that we, the said John Hall and William Hall,
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, that is to
say:―
The object of the Invention is, when using a continuous feed, for the
material to be cut with the teeth of the cutting blades set to cut in
opposite directions from the centre to the ends, to means by which to
obtain increased speed and accuracy of working. For this purpose the
guides for guiding the traverse of the saw frame are set at angles in
place of parallel to the direct line of the cut, the inclines of these guides
being such as to cause the end for the time cutting progressively to
advance to its work, whilst the opposite or back end retires therefrom.
The extent of angle adopted will be varied with the speed of feed
employed. By thus arranging the guides for the opposite ends of the
saw frame at angles one to the other in place of in the same plane the
saws clear themselves better when backing into the wood, allowing every
tooth to do its own proportion of work with greater uniformity, and
without jamming during the times the crank pin giving motion to the
saw frame is passing its dead centre.
We obtain uniformity in the setting of these guides by hanging their
inner ends on pivots, with capability of setting by set screws, and
applying pins or projections at the opposite ends of them to pass into
inclined slots in plates, capable of being slided by screw or other motion,
and connected together by ordinary gear for simultaneous action or such -

page_text: like motion; or in place of the screw and inclines to act on the guides,
we sometimes employ eccentrics connected by lever and links. This
eccentric arrangement is particularly applicable to when the saws cut
vertically, as it is more readily connected with the means for varying the
speed of the feed.
Sheet No. 1 shows various views of a horizontal sawing machine with
parts arranged according to our Invention, Figure 1 being a front
elevation thereof, and Figure 2 a part plan of the same, with parts in a
somewhat different position.
Figures 3, 4, and 5, represent portions in detail, Figure 3 being a
section of the guide beam and parts taken through the line a, b, of 1
Figure 1; Figure 4, an end view of the guide beam, showing the
arrangements for setting the guides in or out as required; Figure 5, a
back view of the guide beam, showing means used for moving the
packing boxes Y in or out from the centre as required by the various
widths of material to be sawn.
In each of these views the same letters indicate corresponding parts.
A is the framing of the machine; B, the main shaft, on which the
crank disc C is keyed, such crank disc C carrying the crank pin O", to
which is fastened one end of the connecting rod D, the other end of
which is connected to the reciprocating saw frame E. This said frame
travels in guides F on the cross beam G, and the cross beam G is raised
and lowered by means of the screws H and bevel wheels H'. The bed I
for conveying the material to be cut is fed by a rack and pinion, which
is driven for its forward motion by means of worm and wheel from the
variable speed pulleys J, the worm K being capable of being thrown out"
of gear by means of the lever L for the convenience of travelling the bed
back by the bevel gear M. at a much quicker rate of speed after a board
has been cut off the timber prior to lowering the beam G ready for
another cut from the timber. Y are packing boxes for steadying the
saw

page_text: In Figure 2 the inclined position of the guides F is more particularly.
shown.
The section, Figure 3, taken through the line a, b, of Figure 1, shows
not only the cross head and the beam, but the means used to allow of
the twisting movements of the slides owing to the guides not being in
straight lines. The cross head E carries the bosses N, N, with screw
adjustment, and these bosses are affixed to the slides O, O, with-
capability of adjustment in the guides F, F. Adjustment for wear
between the slides and guides is obtained by the cup and lock nut P.
Figure 4 shows the cross beam G with the slotted plate Q attached.
On this plate being moved up or down by means of screws and bevelled
wheels, the outer ends of the four guides F are moved in or out as
required, the inner ends being pivoted and stationary.
Figure 5 shows the back of beam G and the packing boxes Y, which
are moved in or out by the screws Z as required.
In Sheet 2 Figure 1 represents a front elevation, partly in section, of
a double vertical saw frame with some of the parts on one side of the
frame that would be but repetitions of those on the other side thereof,
removed for the sake of clearness; Figure 2, a side elevation of same;.
Figure 3, a part sectional elevation through line a, b, Figure 1, with our
improvements applied.
In Figure 1 X is the standards and framing of the machine. A is a
double crank shaft connected by rods to the saw frames B, B. C, C, are
the guide frames, in which the saw frames B, B, reciprocate; the
frames C, C, are pivoted on the bolts D, D. The top of the top and the
bottom of the bottom frames are moved backwards or forwards as
required by means of the eccentrics E, E, through the levers F, F, and
the connecting rods G, G, to the screw H, which is connected to the
lever I used for moving the disc J up or down the face of disc K for
varying the rate of feed as required, and at the same time moving (by
the motion of the eccentrics E, E, communicated through the levers F, F,
and rods G) the guide frames C, C, backwards or forwards as the rate of
feed is increased or decreased. The feed rollers L are driven by the spur
gear and worm wheel from the vertical shaft M.
In Figure 2 the same letters refer to the same parts as in Figure 1 of
this Sheet of Drawings, the position of the guide frames C, C, and the

page_text: eccentrics for moving the same are shown by the dotted lines. N, N, are
rollers, by which the weight necessary for feeding the wood up to the
saws, through leverage obtained from the weights P, P.
Figure 3 shows the section of the guide frames C and the slides Q,
which are also shown on the right hand side of Figure 1, the saw frame
being shown in section. The parts of slide Q in the cross head of the
saw frame are round, and fit in a corresponding hole in the same to allow
them to twist as required during their motion in the guides C, owing to
the guides being set out of line as stated.
The other parts of the machinery represented in the Figures are too
well known to require description.
Having thus described our said Invention, and in what manner the
same is to be performed, we hereby declare that what we claim as of
our Invention is, the arranging or combining parts of sawing machinery
of the character described, whereby the guides for guiding the traverse
of the saw frame are capable of being set at angles in place of parallel
to the direct line of cut, the inclines of such guides being such as to
cause the end for the time cutting progressively to advance to its work
whilst the opposite or back end retires therefrom, substantially as
described.
In witness whereof, we, the said John Hall and William Hall,
have hereunto set our hands and seals, this Twenty-fifth day of
November, in the year of our Lord One thousand eight hundred
and seventy-four.