Improvements in Saw Benches and other Sawing Machines.
Year: 1893

page_text: Date of Application, 14th Nov., 1893
Complete Specification Left, 23rd Dec., 1893-Accepted, 3rd Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Saw Benches and other Sawing Machines.
We, ALFRED BRIDGMAN of Trewsbury House, Trewsbury Road, Sydenham in
the County of Kent, Managing Director and DAVID HOUSE of 16 Macclesfield
Street, City Road, in the County of London, Engineer, do hereby declare the
nature of our invention to be as follows:-
The invention relates to improvements on an invention for which we obtained
provisional protection No. 6310 dated March 24 1893, in which a sliding work-
carrying table is mounted in guides on a canting table and in which self acting
means are employed for setting the work after each cut up to the fence which
latter is capable of regulation to and from the sliding table according to the
substance it is desired to cut. In such form of saw bench the sliding table moves
to and fro in front of the saw and the fence is at a greater or less distance behind
such sliding table, thus when a block is completely cut up and only a thin board is
left such board has a tendency to fall down the space between the sliding and
canting tables and the fence; this we obviate by the employment of a support
fitted in guides in the back edge of the canting table or in the fence and
capable of moving in and out with the fence thereby affording a support for the
work close up to the face of the latter. In such class of saw bench the work ou
the sliding table is gripped for the forward and backward motions by grippers
which necessarily travel on the front side of the saw, thus when a thin board is left
it is pushed by the spring pushers beyond the range of action of the grippers in
which case if nothing else were provided it would fail to be pushed forward, we
obviate this inconvenience by the employment of a thin supplemental pusher
mounted in guides on the front of the fence and connected to the rear gripper by
a rod provided with a ball and socket or universal joint to permit of its moving to
and fro with the fence and yet remaining connected with the gripper. . By this
means a thin board when pushed beyond the grippers and against the fence is
pushed forward by the thin supplemental pusher.
The invention also relates to means for checking the backward motion of the
parts when the sliding work-table receives a quick return motion and a compara-
tively slow forward motion from a disc provided with an adjustable crank pin
giving motion to a lever by working in a slot intermediate of the fulcrum of the
lever and of its connection with the sliding table. For this purpose we employ a
spring or other break in connection with a cam rise on the periphery of the disc,
the break being so adjusted that when in its extreme forward position it shall just
clear the lower portion of the periphery of the disc but is in position to act some-
what forcibly upon the rise of said disc.
This part of the invention is also applicable when using other arrangements for
giving motion to the sliding table.
T 1000

page_text: Improvements in Saw Benches and other Sawing Machines.
We, ALFRED BRIDGMAN, of Trewsbury House, Trewsbury Road, Sydenham in
the County of Kent, Managing Director, and DAVID HOUSE, of 16 Macclesfield
Street, City Road, in the County of London, Engineer, do hereby declare the
nature of our invention and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement :-
The invention relates to improvements on an invention described in the Specifi-
cation filed in pursuance of our application No. 6310 of the year 1893. Our
present improvements are represented in the accompanying drawings in which
Figure 1 is a front elevation, Figure is a plan, Figure 3 is au end view and
Figure 4 is a cross section of so much of the saw bench shown and described in the
aforesaid Specification as will enable us to describe our present improvements:-
The above figures correspond to Figures 11, 12, 13 and 14 of the aforesaid
Specification and are marked with the same letters of reference, and for a more
complete description of the machine we would refer to said Specification.
In such class of machine a sliding work carrying table g is mounted in guides f*
on a canting table f, and self-acting pushers (not shown in the accompanying
drawings) are employed for setting the work, after each cut, up to the fence 1,
which latter, by means of the hand wheel and screw shaft, is capable of
regulation to and from the sliding table according to the substance it is desired
to cut.
In such form of saw bench the sliding table g moves to and fro in front of the
saw, and the fence is at a greater or less distance behind such sliding table.
Thus, when a block is completely cut up and only a thin board is left, such board
has a tendency to fall down the space between the sliding and canting tables f g
and the fence l.
This we obviate by the employment of a support m having supporting and guide
pins m¹ fitting in guide holes in the back edge of the canting table as shown, or
it might be in the fence 1, and capable of moving in and out with the fence by
means of springs m³ placed around the guide pins m', by which means a support is
provided for the work close up to the face of the fence and a thin board is thereby
prevented from falling down the space between the tables f g and the fence l.
In such class of saw bench the work on the sliding table is gripped for the forward
and backward motions past the saw by grippers (not shown in the accompanying
drawings), which necessarily travel on the front side of the saw. Thus, when a
thin board is left, it is pushed by the spring pushers beyond the range of action of
the grippers, in which case, if nothing else were provided, it would fail to be pushed
forward.
We obviate this inconvenience by the employment of a thin supplemental pusher n
mounted in guides on the front of the fence and connected to the rear gripper
bracket by a rod n' provided with a ball and socket or universal joint at n² to permit
of its moving to and fro with the fence and yet remaining connected with the
gripper bracket without strain thereon. By this means a thin board; when pushed
beyond the grippers and against the fence l, is pushed forward by the thin
supplemental pusher n.
The invention also relates to means for checking the backward motion of the
parts when the sliding work table g receives a quick return motion and a
comparatively slow forward motion from a disc 98 provided with an adjustable
crank pin g' giving motion to a lever (not shown in the accompanying drawings) by
working in a slot intermediate of the fulcrum of the lever and of its connection
with the sliding table g.

page_text: For this purpose we employ a spring or other brake o in connection with a cam
rise p on the periphery of the disc g³, the brake o being so adjusted by the nuts o³
that, when in its extreme forward position, it shall just clear the lower portion of
the periphery of the disc gs, but is in position to act somewhat forcibly upon the
cam rise p on said disc.
This part of the invention is also applicable when using other arrangements for
giving motion to the sliding table.
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. In saw benches or sawing machines of the character herein referred to, the
combination with a sliding work table, of a supplemental support, capable of
following the motion of the fence, for the purpose of supporting a board which is
too thin to be supported by the sliding table, substantially as herein shown and
described.
2. In saw benches or sawing machines of the character herein referred to, the
combination therewith, of a supplemental, work pusher to push forward a board
which is too thin to be gripped by the grippers when it is against the fence,
substantially as herein shown and described.
3. In saw benches or sawing machines in which a work carrying sliding table
receives a quicker backward motion than its forward motion, the combination
therewith, of a brake acting upon a cam rise, substantially as herein shown and
described and for the purpose stated.
נית
1000
A. BRIDGMAN,
D. HOUSE,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.