Improvements in and relating to Machinery for Sawing or Cutting Wood and other Material.
Year: 1897

page_text: Date of Application, 17th Feb., 1897
Complete Specification Left, 17th Nov., 1897-Accepted, 8th Jan., 1898
PROVISIONAL SPECIFICATION.
Improvements in and relating to Machinery for Sawing or Cutting
Wood and other Material.
I, THOMAS ROBB, Manager of the City Saw Mills, Port Dundas, in the County
of the City of Glasgow, do hereby declare the nature of my Invention to be as
follows:-
The ordinary band sawing machine consists of a broad steel endless band having
a toothed edge, tightly strained and carried on two main wheels set vertical, one
above the other, at a suitable distance apart on supports, and revolving at a high
speed, thereby giving motion to the said steel band, so that the toothed edge forms
a continuous cutting line to operate as a saw on the wood presented thereto.
The table for carrying the wood is placed at a suitable distance between the
upper and lower wheels, and of sufficient length and breadth from the cutting edge
of saw to afford a convenient support for the timber and for mechanism connected
with the feeding of same into and out from the saw blade.
The saw blade is fitted with guides above and below the timber and a back
support to resist the forward pressure of the timber on the saw blade.
The foregoing is a general description of the vertical band saw in ordinary use.
My Improvements consist all as follows:-
The supporting standard is of a fork shape at the upper end, each of the legs or
pillars forming the fork being fitted with a round piston extending about half
way down the fork legs, the lower ends of those pistons are made to receive a strong
screw, having a toothed mitre wheel geared into two corresponding wheels on a
horizontal shaft actuated by a hand wheel for raising and lowering simultaneously
both of the bearings carrying upper wheel shaft, so that the distance between the
saw wheels may be varied as required. The upper ends of the pistons are made to
carry a swivel bearing for horizontal shaft, on which is secured the upper pulley
for receiving band saw.
One of the pistons supporting the upper wheel shaft, preferably that nearest the
feeding end of the table, is made in two parts, in the length. These parts are
joined by a right and left screw having a toothed mitre wheel geared into a corre-
sponding wheel, made to rotate by means of a short shaft and hand wheel, so that
one of the upper bearings may be elevated or depressed, as may be desired to adjust
the saw on the wheels. The swivel bearing on the ends of the supporting pistons
will take the line of the upper wheel shaft. The saw wheels are made of sheet
iron or steel plate shaped to the desired diameter, that for the lower one being of
a heavier thickness than the top one. Cast iron blocks are rivetted on both sides
at the centre to form boss for attachment to shafts. The periphery or rim is
formed of hard wood blocks with the end grain towards the saw blade, secured on
both sides of plate or web and supported on the inner ends by angle iron secured
on both sides of the plate.
The plate or web of wheel is of less diameter than the periphery of the wood and
orcove is thus formed round the circumference of the wheel. A series of parallel

page_text: grooves are also formed in the outer end wood of the rim whereby the surface of
the rim, in contact with the saw blade, is provided with air space or recesses for
dust, or other matter likely to interfere between the saw blade and edge of the
wheels. These grooves are improvements which may be applied to other forms of
band saw wheels.
be sawn.
The saw guides consist of a pair of pulleys one above and below the timber to
They are carried on suitable supports, having forked arm with central
pin, on which they revolve by contact with inner side of the saw blade. The edge
or face of the pulley is set out beyond the vertical line of the upper and lower
wheels which carry the saw, and thereby strain the saw outwards from the line of
top and bottom driving wheels. The saw is thereby held in an intermediate
vertical line to which the wood to be cut is presented. The top guide pulley is
made to slide vertical, so that it may be adjusted to depth of wood to be cut.
The pulleys are constructed with a projecting flange on the side next the back
of the saw blade and form a revolving resistance to the back thrust of the saw when
pressed by the forward motion of the wood to the cutting edge. The face of these
wheels are also grooved in the same manner as the saw wheels for the sawdust to
pass through. To prevent vibration on the saw blade on its upward movement
from the lower saw wheel to the upper one and to sustain the tension of the saw
blade, there is a pulley in a forked support secured to a bow or other spring which
presses the pulley outwards and by contact with the saw blade revolves on its own
centre.
The timber is fed into the cutting edge of the saw by geared rollers, a pair on
opposite sides of the timber. They are driven by gear chains from upright pivoted
standards having telescopic arms for the adjustment of the rollers in relation to the
eut required. At the point of each arm the roller frame is pivoted and controlled
by a stay which automatically adjusts the centre of each pair of rollers parallel
with the line of cut. This stay is also fitted with an arrangement by which one
roller only may press on the wood. The two pivoted standards, one at each end
and opposite side of the supporting table have their contained shaft driven by
belt or gear chain from upright shaft in the centre and under the supporting table
top. The central upright shaft receives its motion from a horizontal friction
plate resting on a friction pulley attached to a horizontal shaft parallel
with primary shaft from which it receives its motion by means of a
fast and loose pulley or a belt tightener. The rate of feed is controlled
by the position of the friction pulley under the friction plate which is capable of
movement by a hand lever. I'ressure is obtained on the rollers by means of a
weighted lever attached to the upright shafts at each end of table.
In applying these improvements to cutting cork or soft or light material an
endless steel cutting band would be substituted for the saw.
Dated 101 J..
1000
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow.
Improvements in and relating to Machinery for Sawing or Cutting
Wood and other Material.
I, THOMAS ROBB, Manager of the City Saw Mills, Port Dundas, in the County
of the City of Glasgow, do hereby declare the nature of my invention, and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement, that is to say:-
The ordinary band sawing machine consists of a broad steel endless band having

page_text: a toothed edge, tightly strained and carried on two main wheels set vertical, one
above the other, at a suitable distance apart on supports, and revolving at a high
speed, thereby giving motion to the said steel band, so that the toothed edge forms
a continuous cutting line to operate as a saw on the wood presented thereto.
The table for carrying the wood is placed at a suitable distance between the
upper and lower wheels, and of sufficient length and breadth from the cutting edge
of saw to afford a convenient support for the timber and for mechanism connected
with the feeding of same into and out from the saw blade.
The saw blade is fitted with guides above and below the timber and a back
support to resist the forward pressure of the timber on the saw blade.
The foregoing is a general description of the vertical band saw in ordinary use.
And in order that my said Invention and the manner of carrying same into
practice may be properly understood I have hereunto appended three sheets of
explanatory Drawings in which the same reference letters are used to indicate
corresponding parts in all the figures where shown. Figure 1 represents a side
elevation, figura 2 a front elevation and figure a plan view of a vertical band
sawing machine as constructed in accordance with my improvements, while
figure 4 is a detail view of one of the band saw pulleys. Referring to these
drawings:-
My Improvements consist all as follows:-The supporting standard A is of a
fork shape at the upper end, each of the legs or pillars A forming the fork being
fitted with a round piston B extending about half way down the fork legs A
The lower ends of those pistons B are made to receive a strong screw B having
toothed mitre wheels C geared into two corresponding wheels C on a horizontal
shaft actuated by a hand wheel C³ for raising and lowering simultaneously
both of the bearings carrying upper wheel shaft so that the distance between the
saw wheels D D₁ may be varied as required. The upper ends of the pistons B are
made to carry a swivel bearing B³ for horizontal shaft D³ on which is secured the
upper pulley D for receiving band saw d.
One of the pistons supporting the upper wheel shaft D preferably that nearest
the feeding end of the table, is made in two parts, in the length. These parts are
joined by a hollow shaft b and left hand screw having a toothed mitre wheel 12
geared into a corresponding wheel made to rotate by means of
that one of the upper bearings
may be elevated or depressed, as may be desired to adjust the saw
short shaft 7 and hand wheel b5 so
on the wheels. The swivel bearing B2 on the ends of the supporting pistons 1
will take the line of the upper wheel shaft 12. The saw wheels DD are made of
sheet iron or steel plate shaped to the desired diameter, that for the lower one D'
being of heavier thickness than the top one. Cast iron blocks 13 are rivetted on
both sides at the centre for attachment to shafts. The periphery or rim is formed
of hard wood blocks as shown particularly in figure 4 with the end grain towards
the saw blade, secured on both sides of plate or web and supported on the inner
ends by angle iron secured on both sides of the plate.
The plate or web d of wheel is of less diameter than the periphery of the wood
and a groove d¹ is thus formed round the circumference of the wheel. A series
of parallel grooves d² are also formed in the outer end wood of the rim whereby
the surface of the rim, in contact with the saw blade, is provided with air spaces
or recesses for dust or other matter likely to interfere between the saw blade and
edge of the wheels. The wood blocks are held in position by rings 3 and counter-
sunk headed bolts, and also by a ring rivetted at each side of the plate & taking
into grooves on the inner sides of the wood blocks and angle irons are secured at
their inner edge to the plate d. These grooves are improvements which may be
applied to other forms of band saw wheels.
The saw guides consist of a pair of pulleys EE one above and one below the
timber to be sawn. They are carried on suitable supports, having forked arm
with central pin, on which they revolve by contact with inner side of the saw

page_text: blade. The edge or face of the pulley is set out beyond the vertical line of the
upper and lower wheels D D which carry the saw, and thereby strain the saw out-
wards from the line of top and bottom driving wheels. The saw is thereby held
in an intermediate vertical line to which the wood to be cut is presented. The top
guide pulley E is made to slide vertical on the column E³ so that it may be adjusted
to depth of wood to be cut.
saw
The pulleys are constructed with a projecting flange e on the side next the
back of the saw blade and form a revolving resistance to the back thrust of the saw
when pressed by the forward motion of the wood to the cutting edge. The face
of these pulleys are also grooved in the same manner as the saw wheels for the
sawdust
the
blade Onl
to pass through. To prevent vibration on
its upward movement from the lower saw wheel D₁ to the upper one 1)
and to sustain the tension of the saw blade, there is a pulley E¹
in a forked support secured to a bow or other spring E which presses the pulley
outward and by contact with the saw blade revolves on its own centre.
The timber is fed into the cutting edge of the saw by sets of geared rollers F
a pair on opposite sides of the timber. They are driven by gear chains E from
upright pivoted standards F2 having telescopic arms for the adjustment of the
rollers in relation to the cut required. The arms F3 are capable of adjustment by
a screw and hand wheel 15 or in the case of the front rollers F by a screw c
actuated by a handle. At the point of each arm F³ the roller frame F is pivoted
and controlled by a stay f which adjusts the centre of each pair of rollers F parallel
with the line of cut. This stay f is also fitted with an arrangement by which one
roller F may only press on the wood. The two pivoted standards F2 one at each
end and opposite side of the supporting table have their contained shaft f¹ driven
by spur gearing f³ ft and chain gear ff from a vertical shaft f. On this shaft f
is mounted a horizontal friction plate which rests on a friction pulley g' attached
to a horizontal shaft g2 parallel with primary shaft G from which it receives its
motion by means of ordinary belts and pulleys. The rate of feed is controlled by
the position of the friction pulley g under the friction plate g which is capable of
movement by a hand lever g³. Rigidity is obtained on the back set of rollers F by
an adjusting screw H, and pressure on the front rollers F by a chain H' at top
and bottom of columns led over guide pulleys H2 to a weight H³ underneath the
frame.
In applying these improvements to cutting cork or soft or light material an
endless steel cutting band would be substituted for the saw.
Having now particularly described and ascertained the nature of my said
Invention, I declare that what I claim is: -
First. The construction or arrangement and combination of the parts of a
machine for sawing or cutting wood and other material, substantially as herein
described in reference to and shown in the accompanying drawings.
Second. In a machine for sawing or cutting wood or other material the arrange-
ment of swivelling bearings carried on reciprocating pistons substantially as herein
described in reference to and shown in the accompanying drawings.
Third. In machinery for sawing or cutting wood or other material the forming
of the wheels for carrying the band saw with grooves substantially as and for the
purposes herein described in reference to and shown in the accompanying drawings.
Fourth. In a machine for sawing or cutting wood or other material, the arrange-
ment of rollers and carrying devices with adjusting stay for keeping these parallel
with the line of cut, substantially as herein described in reference to and shown in
the accompanying Drawings.
Fifth. In a machine for sawing or cutting wood or other material the forming
of the saw guide pulleys with a projecting flange on the side next the back of the
saw blade, substantially as and for the purposes herein described in reference to
and shown in the accompanying Drawings.
Sixth. In a machine for sawing or cutting wood or other material the forming

page_text: of the saw wheels of wood blocks with the end grain towards the saw blade, sub-
stantially as herein described in reference to and shown in the accompanying
Drawings.
Dated the 16th day of November 1897
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.