Year: 1886

page_text: Date of Application, 9th Nov., 1886
Complete Left, 9th Aug., 1887.
Complete Accepted, 9th Sept., 1887.
We HENRY FOSTER and ALFRED FOSTER, both of Boxinoor Saw Mills, Hemel
Hempstead in the County of Herts, Timber Merchants and Manufacturers, do hereby
declare the nature of this invention to be as follows :-
The main object of this invention is to provide a means for regulating the feed of
the work to suit varying circumstances, without arresting the action of the machine.
In applying our invention to a circular saw frame, we take the motion for the food
from the saw spindle which carries the driving pulley, and similarly, when applying
our invention to a band saw frame, we take it from the first motion shaft. Fitted to
the horizontal spindle of the circular saw frame, and capable of sliding freely over a
feather on that spindle, is a friction disc, which is held in contact with the periphery
of a disc set at right angles thereto. This disc is similarly fitted to a shaft, preferably
vertical, which carries at foot a worm for transmitting the motion which is imparted
to its shaft from the saw spindle. The boss of the disc on the saw spindle has an
annular groove, which is embraced by a fulcrumed fork weighted so as to hold the
disc in contact with the periphery of the second friction disc. The boss of this second
disc is also grooved to receive a fulcrumed fork, which is operated by a pedal. By
depressing this pedal, its disc may be brought nearer to the centre of motion of the
saw spindle disc, and thus the speed of motion imparted to it will be proportionately
decreased. The worm carried by the shaft of the second disc gears into a worm
wheel running loose on a transverse shaft, and having on one side clutch teeth, such
teeth, when in gear, rotating a toothed clutch working on a feather, and controlled by
a fulcrumed fork lever. This shaft also carries a chain wheel. An endless chain from
this chain wheel passes up to a chain wheel on a transverse shaft, which is fitted with
a pair of spur pinions. These pinions gear into racks fitted on the under side of the
travelling carriage, and as, therefore, the worm wheel is rotated through the friction
discs and worm, a feed motion will be imparted to the carriage by the spur pinions on
the transverse shaft, the rate of speed varying according to the relative positions of
the two friction discs. In order to impart a back traverse motion to the carriage,
it will be necessary to throw the clutch out of gear with the worm wheel. The back
traverse motion is obtained from a grooved wheel or pulley at the outer side of the
loose pulley of the saw spindle, this grooved wheel or pulley receiving a loose rope or
band from a pulley keyed to the transverse shaft,

page_text: By tightening this rope or band when the chain wheels are thrown out of action,
the transverse shaft may be driven in the opposite direction, and caused, through its
spur pinions, to give the return notion to the carriage. The advantage claimed for
this arrangement is that immediately the saw has finished its cut, the driving band
may be thrown onto the loose pulley, the carriage reversed, and the log carried back
the required distance whilst the saw is at rest.
As a modification of our invention, we propose to mount the friction disc of the
saw spindle upon the extremity of that spindle, and thus provide for the traverse of
the second disc past the centre of the first, in order to reverse the direction of travel
of the carriage.
We propose also to adapt our invention to a compound saw frame, in which a rotary
saw and a band saw are combined in such manner as to admit of either saw being
used at pleasure. The feed will however be the same for both saws.
Supposing the band saw to be driven by gripping rolls after the manner described
in the provisional specification filed simultaneously with the present application, we
gear the shaft of the driven roll with the circular saw, and the transverse shaft which
carries the spur pinions for traversing the carriage, we drive by gearing from the
shaft which carries the second friction disc. This shaft will take a horizontal,
instead of a vertical position, as before mentioned; and a suitable modification of
the mechanism for shifting the position of its friction disc will consequently be
required.
We adapt also our arrangement for a varying feed to ordinary drag saw benches.
For this purpose we attach to a shaft carrying a worm wheel, a loose drum or flanged
wheel, on which we coil the necessary length of rope or chain.
Where the return of the rope is required, we detach the clutch connecting drum
wheel with spindle on which it revolves. The rope or chain may then be freely
drawn back.
NEWTON & SON,
Agents for the Applicant.

page_text: The main object of our invention is to provide mechanism for regulating the feed
of the work to suit varying circumstances which mechanism can be operated without
arresting the action of the saw proper.
In the accompanying drawings
Figure 1 is a side elevation showing the application of our improvements to a band
saw and
Figure 2 is a section on the line x, x, figure 1.
a, is the frame of the machine and b, is the platform or table upon which the timber
is placed and which is adapted to move longitudinally by means of the racks c, c, and
pinions d, d, mounted upon the shaft e.
ff are pulleys around which the saw-band passes, the pulley f', having upon one
side a plain face g, forming a disc as shewn in figures 1 and 2.
h, is a friction pulley which is connected with the shaft i, and is adapted to bear
against the face g, so that when the pulley f¹, rotates, motion is imparted to the
friction pulley. The pulley h, is connected with the shaft i, by means of a spline joint
and is adapted to be moved longitudinally on the shaft by means of the fork k,
engaging with a groove l, in the hub of the wheel h, the said fork being moved in
one or the other direction by means of the screw shaft P, operated by the bevel
wheels m.
The shaft l, has fixed to it a worm n, engaging with a worm wheel o, on the shaft ẹ,
for imparting motion to the latter.
The operation of the feed regulating apparatus hereinbefore described is as follows,
that is to say; suppose the feed is to be rapid the friction pulley h, is moved towards
the circumference of the face g, for instance as indicated by dotted lines at p, so that
the speed of this portion of the friction disc is imparted to the pulley h. If however,
the speed is to be reduced the wheel h, is moved by the screw shaft 4, more or less
towards the centre of the face g, according to the speed required. By moving the
wheel h, to the centre of the face g, the said wheel is brought to rest, a recess q, being
formed at this point to prevent any friction between the face g, and the whoel h, when
the latter is at rest.
Instead of forming the recess q, a small circular plate may be introduced in the
centre of the face 9, and adapted to rotate freely therein. When the wheel h, is
moved into contact with the said circular plate the latter will remain stationary whilst
the wheel, is revolving.
If the table is to be moved backward the wheel h, is moved across the centre of
the face g, so that motion is then imparted to the said wheel in a reverse direction to
that in which it previously rotated.
It will be understood from the foregoing description that the feed may be regulated
at will without stopping the saw by simply turning the screw shaft l, in one or other
direction as required.
It is obvious that our improvements are equally applicable to circular saw frames.
In this case the friction disc may be applied to the saw spindle either at one end or at
a point intermediate between the driving pulley and the saw, the only essential
requirement being the arrangement of suitable shafts (either vertical, oblique, or
horizontal) and gearing between the wheel which bears against the friction disc and
the shaft carrying the pinions engaging with the racks beneath the table. In this case
also the friction wheel is moved over the disc by means of a fork as heretofore, the
said fork being operated either by means of a screw or rack motion or through the
medium of treadles or levers.
When the friction disc is placed between the saw and the belt pulleys it is necessary
to provide independent mechanism for effecting the return motion of the table for the
reason that the friction wheel cannot be moved over the centre of the disc owing to
the presence of the shaft. This reversing mechanism, however, may be of any
ordinary or suitable construction and forms no part of our invention.
We can adapt our invention to a compound saw frame, in which a rotary saw and a
band saw are combined, in such manner as to admit of either saw being used at
pleasure. The feed will, however, be the same for both saws.

page_text: Supposing the band saw to be driven by gripping rolls in the same manner as
described in the Specification of Letters Patent, No. 14,469, of even date herewith,
we gear the shaft of the driven roll with the circular saw and the transverse shaft
which carries the spur pinions for traversing the carriage we drive by gearing from
the shaft which carries the second friction disc. This shaft will take a horizontal,
instead of a vertical position, as before mentioned and a suitable modification of
the mechanism for shifting the position of its friction disc, will consequently be
required.
We also adapt our invention for a varying feed to ordinary drag saw benches. For
this purpose we attach to a shaft carrying a worm wheel actuated by a friction disc
and wheel connected with the saw spindle as before explained, a loose drum or flanged
wheel, on which we coil the necessary length of rope or chain. When the return of
the rope is required, wo detach the clutch connecting the drum wheel with the spindle
on which it revolves. The rope or chain may then be freely drawn back.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:—
1. The combination with a band or circular saw having automatic feed mechanism,
of two wheels or discs placed in frictional contact so that motion imparted to one of
the wheels or discs is communicated to the other, one of the said wheels or discs being
adapted to be moved towards and away from the axis of the other, for the purpose
specified.
2. The combination with a band or circular saw having automatic feed mechanism,
of two discs the edge of one of which is adapted to bear against the face of the other
with frictional contact, and to be moved towards and away from the centre of the
same, substantially as and for the purpose described.
3. The improved mechanism constructed substantially as hereinbefore described
with reference to the accompanying drawings for regulating the feed of circular or
band saws.
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