IMPROVEMENTS IN OR IN CONNECTION WITH ENDLESS BANDSAW FRAMES
Year: 1879

page_text: LETTERS PATENT to Hector Aylesbury, of the City and County of Bristol, for
the Invention of "IMPROVEMENTS IN OR IN CONNECTION WITH ENDLESS
BANDSAW FRAMES."
Sealed the 1st August 1879, and dated the 15th February 1879.
PROVISIONAL SPECIFICATION left by the said Hector Aylesbury at the
Office of the Commissioners of Patents, on the 15th February 1879.
HECTOR AYLESBURY, of the City and County of Bristol.
OR IN CONNECTION WITH ENDLESS BANDSAW FRAMES."
"IMPROVEMENTS IN
The primary object of my Invention is so to construct band saw frames that I
am able to cut two or more thicknesses of material at one and the same time,
according to the number of endless band saws used for this purpose; supposing I
use two sawa I employ two main guide pulleys on one common shaft, and two other
main guide rollers or pulleys on another shaft round which the two saws revolve by
motion communicated to the shaft or shafts in the ordinary way; one or both of
the endless saws is or are passed round, say, two other guide pulleys on one sido,
and say, one guide pulley at back, all of these latter guide pulleys being capable of
having their position adjusted so that one of the saws may be drawn out of the
plane of the adjacent saw to the distance required for the work to be accomplished,
both saws then revolving, the material operated on is cut twice, or in two places,
at equal or unequal distances apart upon the same frame and at one operation, all
according to the angle at which the saws are laid. A similar result is obtained for
three saws and so on. The adjustment of the guide pulleys may be effected by
screws and slide guide or other convenient means, and a scale may be applied to
the adjusting arrangement for convenience and regularity of work. A convenient
way to regulate the position of the single guide pulley is by a weighted lever, but
of course other means may be adopted, such as springs.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Hector Aylesbury in the Great Seal Patent Office on the 15th
August 1879.
HECTOR AYLESBURY, of the City and County of Bristol.
OR IN CONNECTION WITH ENDLESS BAND SAW FRAMES."
"IMPROVEMENTS IN
The primary object of my Invention is so to construct band saw frames that I
am able to cut two or more thicknesses of material at ono and the same time
according to the number of endless band saws used. For this purpose supposing
I use two saws, I employ two main guide pulleys on one common shaft, and two
other main guide rollers or pulleys on another shaft round which the two saws
revolve by motion communicated to the shaft or shafts in the ordinary way; one or
both of the endless saws is or are passed round, say, two other guide pulleys on
one side, and, say, one guide pulley at back, all of these latter guide pulleys being
capable of having their position adjusted, so that one of the saws may be drawn
out of the plane of the adjacent saw to the distance required for the work to be
accomplished; both saws then revolving, the material operated on is cut twice, or
in two places, at equal or unequal distances apart upon the same frame and at onc
operation, all according to the angle at which the saws are laid.
A similar result is obtained for three saws and so on. The adjustment of the
guide pulleys may be effected by screws and slide, guide, or other convenient means,
and a scale may be applied to the adjusting arrangement for convenience and
regularity of work.
A convenient way to regulate the position of the single guide pulloy is by a
weighted lever, but of course other means may be adopted, such as springs.
According to this Invention I construct endless band saw frames in such a manner
that by combination of two or more endless band saws I am able to cut two or
more thicknesses of material at one and the same time, and so that the required
thicknesses may be adjusted by the saw blade or blades without disturbing the fence.
And in order that this my Invention may be fully understood I will now pro-
ceed to describe the same with reference to the accompanying Sheet of Drawings
in which Figure 1 is a sido elevation; Figure 2, a vertical section through A, B,
(Figure 1); and Figure 3, a vertical section through C, D, (Figure 1) of a frame
*fitted with two endless band saws. A and A¹ are the two upper main flange or
guide pulleys, and B, B¹, the two lower main flange or guide pulleys. The pulleys
A and A¹ are mounted on separate shafts C and C, and the lower pulleys B and B¹
are mounted on the common shaft or spindle D. The endless band saws E and E!
(which are shewn in dotted lines in Figure 2) are passed round the pulleys A and
B and A¹ and B' respectively.
F is a strap pulley on the lower shaft D and thus driving both saws simul-
taneously.
Each of the saws is provided with a self adjusting packing appliance F¹ and F³,
the former being fastened by means of a nut f' but so as to turn freely, and the
latter by a dovetail groove piece which can freely turn on the bracket G₁ which is
vertically adjustable as shewn. The packing appliances being able to turn freely
and being chambered out to receive oiled hemp or other suitable packing serve to
steady the blade near the cut without straining it, and lubricates it at the same
time. As regards the adjustable saw E' this packing appliance also adjusts itself
to any bevel of the same. The back saw blade E always remains in the same
position; it is provided with steadying or guide pulleys H, H¹, one above the table I
and one below.
The front saw blade E¹ is on the other hand adjustable, so that it may produce
a cut through the timber in various distances from the cut produced by the saw
blade E and from the fence K. This adjustment is produced by shifting the

page_text: distending guide pulley L and fitted on the bracket G¹, which may be made
vertically adjustable as shewn here, or may be a fixed projection from the alides
P and Q, which by means of the hand wheel O, the bevil wheels n, n, and m, m,
and the right handed screw N, and the left handed screw M are moved simul-
taneously, the slides P and Q working on the guides p, q, which may be marked
with gauge lines or scale for convenience of adjustment to the required thickness to
be cut.
If the screw shafts M and N are disconnected from each other, one of them may
be moved relatively to the other so that the saw blade cuts on a bevil. For this
purpose one of the bevil wheels (say m) may be disconnected by removing a pin
or set screw.
The saw blade El has also a distending pulley. L below_the_table_and_with_its_
fulcrum stay on the slide Q.
The bearings R, R¹, for the upper shaft C, C', are separately adjustable to give
the required tension for each of the blades E and E'; this may be done by means
of regulating screws c and c', which in order to give the required elasticity act on
spiral springs r, r', in the framing in which the bearings can slide up and down;
or it might be done by means of weighted levers.
In the example here given I have only shewn one saw fixed in position and one
saw adjustable as to position of the cutting part, but I may uso one saw in fixed
position in combination with two or more saws adjustable as to position of the
cutting parts relating to the latter, being simply repetitions of the parts here shown
in connection therewith.
The means above described for distending an endless saw blade, viz., by a dis-
tending appliance both above and below the table, may also be applied to saw
frames with a single endless band saw, whereby I am thus enabled similarly to
alter the thickness to be cut without shifting the fence and also to cut any required
bevil.
And having thus described and ascertained the nature of this Invention I declare
that I claim,-
First. The combination of one frame of an endless band saw fixed in position,
and one or more endless band saws adjustable in position as to the cutting part
thereof by means of distending pulleys or parts above and below the table, for
cutting two or more like or different thicknesses at the same time without shifting
the fence or for cutting one straight cut and one or more bevil cuts, and by which
combination of parts I am enabled to drive two or more band saws by one strap,
all substantially as described.
Second. The means described for distending the cutting side of the blade of an
endless saw both above and below the table, whereby the thickness to be cut can
bo regulated without shifting the fence.
In witness whereof, I, the said Hector Aylesbury, have hereunto set my
hand and seal, this Eleventh day of August, in the year of our Lord One
thousand eight hundred and seventy nine.