Improvements in Band Sawing Machines.
Year: 1892

page_text: Date of Application, 15th Mar., 1892
Complete Specification Left, 15th Dec., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Band Sawing Machines.
I, ALLEN RANSOME of Stanley Works Chelsea London Engineer do hereby
declare the nature of this invention to be as follows :-
This invention relates to improvements in band sawing machines of the larger
descriptions, for sawing logs, flitches and deals, whereby perfectly true cutting is
ensured, both longitudinally and transversely, thus overcoming the great difficulty
which has hitherto existed of the saw running out of the true line and cutting
dished boards.
The improved device consists in the peculiar construction of the saw guides
through which the blade passes, and which are placed immediately above and
below the piece of timber to be cut, to maintain the blade in its proper position as
it passes through the log.
By this improvement the slightly angular motion which is found necessary in
practice to impart to the saw takes place upon an imaginary centre corresponding
with the centre line of the cutting edge of the saw, so that the saw teeth always
retain their theoretically correct position in a perfectly straight line between the
saw pulleys.
To effect this object I construct my saw guides in the following manner :-I
mount the packing pieces which support the sides of the saw, and also the roller
which is added to prevent the saw from being forced off the pulleys, when it first
strikes the wood, in a forked carriage or frame, made in two halves for convenience
in fitting, and having parts of a trunion on each limb, which project downwards in
the case of the upper guide and upwards in the case of the lower guide, to take
into corresponding circular recesses formed in two sole plates to which the forked
carriages are attached, and which are also slotted to allow of the saw passing
through them. The sole plates are adjustable longitudinally and transversely to
suit any position of the saw blade the points of the teeth of which pass through
the centre of the trunion. A handle is formed on the back of the forked carriage
by which it can readily be pivotted on its trunion thereby deflecting the blade in
either direction as desired. A locking bolt is fixed in each sole plate projecting
through a curved slot in the forked carriage by means of which the latter can be
clamped in any desired position. The roller behind the saw runs in bearings in the
forked carriage, which can be adjusted in a slot to suit saws of various widths.
My invention also relates to the mode of compensating the wear, or otherwise
adjusting the packing pieces in the forked carriages by pivotting each upon a
centre pin, and furnishing each with four adjusting screws, by means of which any
portion of the surface of the packing can be set up close to the saw.
Dated this 15th day of March 1892.

page_text: COMPLETE SPECIFICATION.
Improvements in Band Sawing Machines.
I, ALLEN RANSOME, of Stanley Works, Chelsea, London, 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:
This invention relates to improvements in band sawing machines of the larger
descriptions for sawing logs, flitches and deals, whereby perfectly true cutting is
ensured, both longitudinally and transversely, thus overcoming the great difficulty
which has hitherto existed of the saw running out of the true line and cutting
dished boards. The improved device consists in the peculiar construction of the
saw guides through which the blade passes, and which are placed immediately
above and below the piece of timber to be cut, to maintain the blade in its proper
position as it passes through the log.
By this improvement the slightly angular motion which is found necessary in
practice to impart to the saw takes place upon an imaginary centre corresponding
with the centre line of the cutting edge of the saw, so that the saw teeth always
retain their theoretically correct position in a perfectly straight line between the
saw pulleys.
To effect this object I_construct my saw guides in the manner shown in the
accompanying drawings Figure 1 being a plan Figure 2 a side elevation and
Figure 3 an end elevation of the upper saw guide whilst Figures 45 and 6 are
similar views of the lower saw guide. As shown in these drawings I mount the
packing pieces A which support the sides of the saw B and also the roller C which
is added to prevent the saw from being forced off the pulleys (which are not shown
in the drawings) when it first strikes the wood, in a forked carriage or frame D,
made in two halves, for convenience in fitting and having parts E of a trunnion on
each limb, which project downwards in the case of the upper guide and upwards in
the case of the lower guide to take into corresponding circular recesses formed in
two sole plates F F to which the forked carriages D are attached and which are
also slotted to allow of the saw passing through them. The sole plates F are
adjustable longitudinally and transversely to suit any position of the saw blade the
points of the teeth of which pass through the centre of the trunnion. In the case
of the lower saw guide this is done by means of slots in it which receive bolts G
and H respectively whilst the upper saw guide is mounted on a slide J to which it
is secured by bolts K, the slide J being free to move transversely in a guide L and
is actuated and secured by the nuts Lon the screw L'as shown in the detached
view Figure 7. A handle M is formed on the back of the forked carriage D by
which it can readily be pivotted on its trunnion E thereby deflecting the blade in
either direction as desired. A locking bolt N is fixed in each sole plate projecting
through a curved slot in the forked carriage by means of which the latter can be
clamped in any desired position. The roller C behind the saw runs in bearings in
the forked carriage, which can be adjusted in a slot by means of bolts and nuts O
to suit saws of various widths. My invention also relates to the mode of com-
pensating the wear or otherwise adjusting the packing pieces in the forked carriages
by pivotting each upon a centre pin P and furnishing each with four adjusting
screws Qby means of which any portion of the surface of the packing can be set
up close to the saw.
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 :-
1. Band saw guides pivotted about the edge of the saw substantially as

page_text: 2. Band saw guides pivotted about the edge of the saw and adjustable longi-
tudinally and transversely substantially as described.
3. The forked carriage or frame D made in two halves each having a half
trunnion E substantially as described.
4. The combination with a forked carriage or frame for the saw guides of a
roller bearing against the back of the saw and adjustable longitudinally in the
carriage or frame substantially as described.
5. The combination of a forked frame, band saw guides pivotted at their centres
to it and means for setting them up against the saw substantially as described.
6. The band saw guides and attachments substantially as described and shewn in
the drawings.
L
1000
A. RANSOME.