Improvements in or relating to Machines for Sharpening and Setting Saws.
Year: 1896

page_text: Date of Application, 11th Dec., 1896-Accepted, 30th Jan., 1897
COMPLETE SPECIFICATION.
Improvements in or relating to Machines for Sharpening and
Setting Saws.
A communication from AMABILE LAZZARINI, of Turin, in the Kingdom of
Italy, Gentleman.
I, ALFRED JULIUS BOULT, of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, 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 :-
The machine forming the subject of the present application serves for sharpening
all kinds of saws-whether band how or circular-by means of emery, carborundum
or even by steel milling cutters, and at the same time for setting their teeth, that
is to say to alternately turn them in opposite directions.
In the accompanying drawing
Figure 1 is a side-view of the machine,
Figure 2 a front-view,
Figure 3 another side-view of a machine provided with a special bracket M.
Figure 4 is plan view of the machine with a circular saw in position ready to be
sharpened.
Fig. 5 is the similar plan view with a saw blade in position.
Figure 6 is a plan of the shaft on which the emery wheels are secured.
This machine has the following advantages:-
1) The rapidity of sharpening and setting operations,
2) Absolute uniformity and precision of work,
3) The possibility of sharpening and setting any saw simply by changing the
emery wheels and the setting tool, all the other changes being effected by means of
a screw,
4) The possibility of making old and even toothless saws as good as new,
5) Perfect sharpening of the saw, and
6) Possibility of regulating as desired the setting of the teeth according to the
kind of the saw and to the work which, it will have to do; and finally maintaining
the temper of the saws during the sharpening operation.
The machine consists, as will be seen, from the drawings of a lower part or
base A which may be secured to a cast-iron bed plate or standard or to a block of
wood or brickwork or other foundation.
On this lower part slides, by means of a screw and nut, a frame B (Figs. 1, 2,
3, 4, & 5) on the front face of which is provided a slide C having au arm or
extension D capable of lateral movement by means of oblong holes in the plate of
said slide.
On the arm D may be fixed at different heights the setting tool P (Figs. 1 2 3).
In its lower part the slide C carries two brackets E in which revolves an endless
screw F driven by a pinion Y which in its turn is driven by a toothed wheel X
from the pulley V, the support G of which is secured to the slide C (Figs. 1, 2, 3,
4, 5). The frame B carries an arm H terminating in a slide-way in which slides
a plate I (Figs. 2, 4 and 5) operated by means of a lever K secured by a pin to the
toothed wheel R rotated by the endless screw F.
A guide T having a roller m is used to guide the saw-blade to prevent its
displacement under the action of emery-wheels Z Z and of the setting tool P.
In order to enable the angle of inclination of the tooth relatively to the plane
of the saw to be varied as desired, the frame B. of the machine, may be constructed

page_text: so as to be capable of rotating round its vertical axis and thus of bringing the
emery-grinders ZZ (Fig. 4) in contact with the saw under any desired angle
which may be varied at pleasure.
The working of the machine is as follows:-
W is a saw-blade pressed by the roller m (Fig. 2); with the teeth of this saw
engages a pawl L (Figs. 2, 4 and 5) connected to the arm I; the emery-wheels Z Z
are raised to the plane of the saw, and their peripheries are provided with inclined
edges in order to adapt them to the profile of the teeth.
If the pulley V is started by means of belts connected to the transmission shaft
of the works, the toothed wheel X will drive the pinion Y which will drive the
emery wheels Z Z and the endless screw F.
The toothed wheel R being driven by the endless screw moves the pin on which
is keyed the lever o and forces the slide to descend and causes the rotating emery
wheels to come into contact with the saw thus sharpening its teeth the emery
wheels then rise upwards touching the same teeth, and with these wheels the
setting tool P also rises which in its first descending movement had simultaneously
set two teeth by means of recesses in said tool corresponding exactly to the teeth
of the saw to be sharpened.
As soon as the emery wheels in their descending movement cease to touch the
teeth already sharpened the lever K (Figs. 2, 4 and 5) brings the plate I forward
and the pawl L engaging with the bottom of the space between the teeth moves
the saw to a distance equal to or double that of the pitch of the saw, which
distance may be found experimentally each time a saw is set or by means of the
adjusting screw of the slides.
This movement being continuous and each turn of the toothed wheel R
corresponding to two sharpened teeth and to the setting of two others from the
constant repetition of the above movements the operation of sharpening and of
setting will proceed with the utmost regularity during the rotation of the wheel R
all the movements simply depending on this wheel. It is evident that if instead of
a bow-saw blade a band-saw were taken the operation would be exactly the same
and the teeth would be all uniformly set and sharpened.
For circular saws the support T with the roller is. removed and replaced by a
special bracket M which is provided with suitable openings for two movements at
right angles to each other and is provided at its upper part with a roller m for
pressing the top of the saw against the small supporting anvil against which the
tool exercises its pressure for the purpose of setting. The upper movable part of
the bracket M (Figs. 3 and 4) may be adjustable forwards and backwards by
means of openings or slots and thus the roller may be adapted to any diameter of
circular saw within the limits of said slots.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent and in what manner the
same is to be performed I declare that what I claim is :-
1. In a machine for sharpening and setting saws means whereby simultaneous
circular and reciprocating movements of the parts producing the sharpening setting
and feeding of the saw blades are produced in a perfectly regular manner in order
to attain absolute regularity in the size shape and inclination of the teeth of the
saw, substantially as described.
2. The combination and arrangement of parts constituting a complete machine
for the sharpening and setting of saws substantially as described and illustrated in
the accompanying drawing.
Dated this 11th day of December 1806
BOULT & WADE,
Agents for the Applicant.