An Apparatus for Setting the Teeth of Saws.
Year: 1897

page_text: Date of Application, 19th Jan., 1897-Accepted, 6th Mar., 1897
OF BUITIATION.
An Apparatus for Setting the Teeth of Saws.
I, PAOLO TOMMARCHI of Ameglia, Genoa, in the Kingdom of Italy, 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 an apparatus of exceeding simplicity intended for the
purpose of giving "set" to the teeth of saws.
In the accompanying drawing which illustrates this invention:-
Figure 1 is a broken view in front elevation.
Figure 2 is a broken view in side elevation, and
Figures 3, 4 and 5 are views of details.
Throughout the views similar parts are marked with like letters of reference.
This invention consists essentially of a strong frame P carried on a suitable
stand or foot, or adapted to be fixed to a table. In this frame there is mounted a
transverse axle H adapted to be moved in a vertical direction in the said frame by
means of a screw V operated by a horizontal lever L or its equivalent. The
shaft H carries at one end a crank handle M or a power-driven pulley from which
it receives a rotary movement. On the other end there is mounted the device
which constitutes my invention. This consists of three parts, viz.; two discs O
formed with teeth on their inner faces and a pinion E. These are so mounted on
the axle H that they rotate with it but are capable of sliding thereon so that they
can be tightened up to a greater or less degree by means of a tightening nut S.
threaded on the end of the axle H. The teeth a and b on the discs O are alter-
nately in relief and recessed as shown by Figure 4 and inside the same is the
pinion E constructed as shown by Figure 5. Figure 3 shows one of the discs O
with the pinion E in position. The jaw shown by Figure 3 is designed to fit upon
the jaw shown by Figure 4. It is to be understood that the teeth in relief of the
one jaw will coincide or come opposite to the recessed teeth of the other jaw.
Under the axle H there is mounted a guide-piece which is inserted into one or
other of the holes t in the frame according to the width of the saw. This guide-
piece consists of two cylinders or rollers I which are capable of being pressed
together by means of a tightening screw s¹. The saw is placed in between the
said two rollers and is guided thereby.
The mode of using this apparatus is as follows:-The shaft H and the guide
are arranged in such a manner as to place the back of the saw in the guide so that
the teeth of the saw pass between the two discs O in such a manner that the teeth
of the saw engage with the teeth a, b etc. of the said discs.
When the saw is in position the crank-handle M is rotated and the teeth of the
saw in their advancing movement are forced to the right and to the left in alternate
succession. If it is desired to increase the amount of "set" it is merely necessary
to bring the discs O closer together.
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
1 claim is :-
(1.) The improved apparatus for setting the teeth of saws, substantially as
hereinbefore set forth and illustrated by the accommenvine dramine

page_text: (2.) An apparatus for giving "set" to the teeth of saws, consisting essentially
of the two discs O having teeth alternately in relief and recessed, of the pinion E
fixed to the axle H, and of the guide rollers 1 mounted on a stud capable of
being mounted adjustably with respect to the axle H, as set forth.
D
LOLL 1
1007
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.