Year: 1886

page_text: Date of Application, 8th July, 1886.
Complete Left, 24th Feb., 1887.
Complete Accepted, 29th Mar., 1887.
I, JAMES LAW of Saw Mill Road, Partick, in the County of Lanark, North Britain,
Engineer do hereby declare the nature of this invention to be as follows:-
This Invention, which relates to an improved feeding mechanism for saw frames,
has for its object to simplify such mechanism and to render the same less costly than
with the systems of such mechanism at present in use.
The feed mechanism constituting this Invention may be used as a double feed or a
single feed and it consists in coupling the two feed levers (employed in double feed
mechanism) directly to one reversing lever by links, one end of each of which links is
attached to each feed lever whilst the opposite end of each such link is attached to the
reversing lever at opposite sides of the centre on which it vibrates or oscillates.
In place of connecting the two links at opposite sides of the reversing lever as
hereinbefore described, the feed levers may be placed so that their outer ends are
situated at opposite sides of the feed wheel, in which case, the two links which operate
them from the reversing lever are connected to points on the same side of the centre
of the vibrating or oscillating reversing lever.
This system of actuating the two feed levers from one and the same reversing lever
is applicable to the wedge and groove feed as well as to the pawl and ratchet feed.
Dated this seventh day of July 1886
ST. JOHN V. DAY,
115, St. Vincent Street, Glasgow,
Petitioner's Agent.

page_text: An Improved Feeding Mechanism for Saw Frames.
I, JAMES LAW of Saw Mill Road, Partick, in the County of Lanark, North Britain,
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 :—
My Invention, which relates to an improved feeding mechanism for saw frames, has
for its object to simplify such mechanism and to render the same more effective than
with the systems of such mechanism at present in use.
The feed mechanism constituting this Invention consists in coupling the two feed
levers (employed in double feed mechanism) directly to one reversing lever by links,
one end of each of which links is attached to each feed lever whilst the opposite end
qf, each such link is attached to the reversing lever at opposite sides of the centre on
which it vibrates or oscillates.
In place of connecting the two links at opposite sides of the reversing lover as
hereinbefore described the feed levers may be placed so that their outer ends are
situated at opposite sides of the feed wheel, in which case the two links which operate
them from the reversing lever are connected to points on the same side of the centre
of the vibrating or oscillating reversing lever.
This system of actuating the two feed levers from one and the same reversing lever
is applicable to the wedge and groove feed as well as to the pawl and ratchet feed.
In order that my Invention may be properly understood and readily carried into
effect, I will now proceed to describe the drawings hereunto annexed.
At Figure 1, on sheet 1 of the annexed drawings, I have shewn in side elevation a
portion of a vertical saw frame in which the two feed levers are actuated through
links coupled directly to the reversing lever at opposite sides of the centre upon which
the said reversing lever oscillates.
Figure 2, on sheet 2, being a front or end elevation of the same, and at Figure 3,
sheet 3, I have shewn a part of the side elevation of a saw frame somewhat differently
arranged in which the two feed levers are both coupled directly to the reversing lever
at a point or centre on one side of the centre on which the said reversing lever
oscillates.
In Figures 1 and 2, the feed wheel A, is of the construction well-known as the
silent V-shaped groove feed wheel wherein the eccentric pawls B, B¹, engage and
disengage alternately as they are moved by the reversing lever C, in opposite directions
corresponding to the alternate oscillations of the said reversing lever C, thereby
producing the continuous rotation of the feed wheel as is well understood. The
eccentric feeding pawls B, and B are carried in the feed levers D and D¹ respectively
and these feed levers D and Dare connected by means of the links E and E directly
to the centres F and F1 respectively on opposite sides of the oscillating centre G of
the reversing lever C. It will thus be seen that by connecting the feed levers directly
to opposite sides of the reversing lever as shewn at Figures 1 and 2 all the functions

page_text: necessary for actuating the continuous feed are obtained without the introduction of
levers or other gearing between the reversing levers and the feed levers as is the case
in other systems of both ratchet and silent feed for saw frames such as are described
in Pope's Specification No. 725 A.D. 1882 and others, such arrangement also having
the advantage of removing vibrating gearing from the neighbourhood of the floor
space at or about the feed wheel. Whilst a further advantage resulting from this
arrangement is that the direct connection of the feed levers to the adjusting nuts
carried in the reversing lever not only enables the degree of feed to be varied by the
adjusting screw of the reversing lever from time to time according to the rate of feed
required but it also enables the proportion of feed on either side of the reversing lever
to be varied from time to time by placing the adjusting nuts at different distances
from the centre of oscillation of the feed lever which is a feature that is found of
practical importance in saw mills.
In Figure 3, it will be seen that the feed levers D, D¹ in place of being held in
position on the same side of the centre of the feed wheel as is the case in Figures 1
and 2 are situated at a wider angle apart from each other so that the lever D is
supported on the side of the centre opposite to that of the lever D¹. By connecting
the levers D and D' in the positions they are shewn in Figure 3 to the reversing
lever C both the links E and E¹ are connected to the same centre F in the adjusting
nut of the reversing lever C by which arrangement the eccentric pawls B and B are
caused to alternately engage and disengage with the V-groove in the feed wheel and
thereby produce the continuous silent feed.
It is to be understood that if at any time it should be desired to work the improved
feed gear after the manner of the ordinary intermittently acting silent feed that one
of the feed lovers and its pawl may be thrown out of motion by disconnecting it from
the reversing lever by taking off the link connecting the said feed lever and pawl to
the reversing lever in which case the saw frame may be provided with one pawl as
ordinarily carried upon a fixed stud or one of the feed levers may be held stationary
for this purpose as is obvious to the practical user of such saw frames as those to
which this Invention applies.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed, I declare that what I claim is :-
Connecting the feed levers D and D' of the continuous feed mechanism of saw
frames directly to adjustable centres on opposite sides of the centre on which the
reversing lever oscillates or directly to a centre common to both feed levers on one
side of the centre on which the reversing lever oscillates substantially as herein-
before described and shewn upon Figures 1, 2 and 3 of the annexed drawings.