Improvements in Power Feed Band Sawing Machines.
Year: 1894

page_text: Date of Application, 20th Apr., 1894
Complete Specification Left, 21st Jan., 1895-Accepted, 23rd Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Power Feed Band Sawing Machines.
JOHN HALL Station Villas, Beeston Nottinghamshire do hereby declare the
nature of this invention to be as follows:―
The improvements consist firstly in driving the power feed from the upper
pulley which is usually an idle pulley driven by the tension of the saw and connected
in the usual way with the rollers feeding up the material to be cut, by this means
should the saw be bound by the material being cut and slip upon the power driven
pulley the upper or idle pulley driven by the tension of the saw will instantly
reduce its speed proportionatly to the slipping of the saw on the upper idle pulley
thus reducing the speed at which the material is being fed proportionatly with the
reduced speed of the saw, and preventing the breaking of the saw by the feeding
of the material being sawn faster than the saw can cut. It thus being contrary in
its action to a feed driven from the power driven pulley which continues feeding at
the same rate during the times that the saw may be slipping upon the power driven
pulley from being bound by the material being sawn. A further improvement is
in placing the power driven feeding rollers in an horizontal position below the bed
upon which the material is sawn, such bed being capable of being raised above
the level of the rollers when not using the power feed. To enable the band saw
to be taken off the main pulleys the feed rollers are prepared to slide sideways a
sufficent distance to allow the saw to be moved forward off the pulleys along the
slot in the bed as used generally for this purpose. Another improvement consists
in two revolving discs placed at the back of the saw above and below the material
being cut to take up the thrust of the saw arising from the action of cutting the
material. These discs are each carried upon a spindle having its axis fixed higher
at one end thus tilting the face of the disc sufficently to bring the lower face in the
top disc and the upper face of the bottom disc in contact with the back of the saw,
by this means the line of contact of the saw with the face of the discs which are
made at the necessary angles is made in the top disc below the centre of its axis
and in the bottom disc it is above the centre of its axis thus placing the line of
contact of the back of the saw with the upper and lower discs in the best position
to take up the thrust arising from the cutting of the material, without causing
undue straining actions upon the saw. A further improvement is effected by
balancing the weight of the top pulley and the slide carrying the same by a weight
carried over a point of suspension above the pulley, thus allowing the necessary
tension for the various widths of saws used to be taken only by the spring used for
regulating such tension which is contrary to the usual practice of allowing the
spring to take the whole weight of the upper pulley aud slide as well as the tension
of the saw thus allowing the tension to be more efficently regulated.
Dated this 18th day of April 1894.

page_text: Improvements in Power Feed Band Sawing Machines.
JOHN HALL Station Villas Beeston Nottingham Engineer do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
The improvements consist firstly in driving the power feed from the upper
pulley which is usually an idle pulley driven by the tension of the saw, and
connected in the usual way with the rollers feeding up the material to be cut, by
this means should the saw be bound by the material being cut and slip upon the
power driven pulley, the upper or idle pulley driven by the tension of the saw will
instantly reduce its speed proportionally to the slipping of the saw on the lower
driven pulley thus reducing the speed at which the material is being fed
proportionally with the reduced speed of the saw, and preventing the breaking of
the saw, by the feeding of the material being sawn faster than the saw can cut.
It thus being contrary in its action to a feed driven from the power driven pulley
which continues feeding at the same rate during the times that the saw may be
slipping upon the power driven pulley, from being bound by the material being
sawn. A further improvement is in placing the power driven feeding rollers in an
horizontal position below the bed upon which the material is sawn, such bed being
capable of being raised above the level of the rollers when not using the power
feed. To enable the band saw to be taken off the main pulleys the feed rollers are
prepared to slide sideways a sufficent distance to allow the saw to be moved
forward off the pulleys along the slot in the bed as used generally for this purpose.
Another improvement consists in two revolving discs placed at the back of the saw
above and below the material being cut to take up the thrust of the saw arising
from the action of cutting the material. These discs are each carried upon a
spindle having its axis fixed higher at one end thus tilting the face of the discs
sufficently to bring the lower face in the top dise and the upper face of the bottom
disc in contact with the back of the saw, by this means the line of contact of the
saw with the face of the discs which are made at the necessary angles is made in
the top disc below the centre of its axis, and in the bottom disc it is above the
centre of its axis, thus placing the line of contact of the back of the saw, with the
upper and lower discs in the best position to take up the thrust arising from
the cutting of the material without causing undue straining actions upon the saw.
A further improvement is effected by balancing the weight of the top pulley, and
the slide carrying the same by a weight carried over a point of suspension above
the pulley thus allowing the necessary tension for the various widths of saws used,
to be taken only by the spring used for regulating such tension, which is contrary.
to the usual practice of allowing the spring to take the whole weight of the upper
pulley and slide as well as the tension of the saw, thereby allowing the tension to be
more efficently regulated.
But in order that this invention may be the better understood, I will by the aid
of the accompanying drawings proceed to describe the means persued by me in
carrying the same into effect.
In each of the figures the same letters are employed to indicate the corresponding
parts.
Fig. 1 is a front elevation Fig. 2 a front side elevation Fig. 3 an end view of
power feed rollers and Fig. 4 a plan of same.
In Fig. 1 is shewn the method of raising, lowering, and tilting, the table bed
as required by means of the screw a, and moveable tilting bracket a¹. The driving
pulley a mounted on the shaft a³ gives notion to the pulley 6 which is driven
through the tension of the saw b₁ and drives the horizontal feed rollers eff
through the pulleys e c¹ c² on the axis of which is affixed a worm d, working

page_text: into a wheel d' giving motion to the shaft e on which is affixed a feed
roller e. On the shaft e is affixed a wheel f driving through the idle wheel f
wheel, affixed on the shaft on which is mounted the feed roller f' the
shaft drives through another idle wheel f³ the wheel f' on the shaft on which
is mounted another feed roller f8. The feed rollers are placed horizontal and
are kept in their working positions by means of a stop plate 1, placed between
When
the ends of the feed rollers and the bearing m. for the shaft of the rollers.
it is desired to bring forwards the saw off the main pulley the stop plate 1, is removed,
and the feed rollers * f are formed to move sideways a sufficent distance to
enable this to be done as shewn at Fig. 4. The top pulley driven by the tension
of the saw b with its frame, slide, shaft and pulley c for driving the feed rollers
I suspend by a cord h. and weights . The tension required to tighten up the
various widths of saws, being taken up only by the screw and spring in the spring
box i.
The table bed j Fig. 3 is provided with a fence j¹ to which the material to be
sawn is held either by rollers or springs as generally used and the material to be
cut is pressed down on to the projecting surface of the feed rollers above the table
bed by rollers k weighted to more effectually feed up the material being sawn as at
Fig. 3.
At the back of the saw I place two discs the top disc being placed above
the table bed and the bottom disc g below the table bed to take up the thrust
of the saw 6 consequent on the feeding up of the material being sawn as at
Fig. 2.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
Firstly. The driving of the power feed from the pulley driven by the tension of
the band saw.
2ndly. Moving the feed rollers sideways to allow the saw to be taken off.
3rdly. Balancing the weight of the shaft and pulley driven by the tension of
the saw, by a seperate arrangement and the using of another spring to adjust the
required tension of the saw.
4thly. The tilting of the discs for receiving the thrust arising from cutting the
material at the back edge of the saw, to enable the points of contact to be on the
lower side of the upper disc and the upper side of the lower disc.
Dated this 19th day of January 1895.
JOUN НАТТ
TIVA NHor