An Automatic Saw Sharpening and Retoothing Machine for Saws for Hot Iron and the like.
Year: 1899

page_text: Date of Application, 7th Dec., 1899
Complete Specification Left, 7th Sept., 1900-Accepted, 27th Oct., 1900
PROVISIONAL SPECIFICATION.
An Automatic Saw Sharpening and Retoothing Machine for Saws for
Hot Iron and the like.
JOSEPH HILL, St. George's Engineering Works, Woods Lane, Derby, Derby-
shire, Engineer, do hereby declare the nature of this invention to be as follows:-
My present invention, consists of a simple, and effective automatic saw sharpen-
ing machine suitable for sharpening, or retoothing circular saws used for sawing
hot iron, steel etc.; or for sharpening other kind of saws.
The machine consists of an upright standard, upon which is attached all the
various brackets, & parts of the machine; down one side of this standard is formed
a vertical veed slide, on which slides a bracket or carriage, having a spindle,
with washers of large diamiters fitted into it, which is intended to carry the saw.
The saw being placed, and cramped between the large washers.
On the said spindle I fix a worm wheel, which is revolved by a worm carried
in bearings on the underside of the said bracket; on the same spindle, as the
worm, is a proper pitched ratchet wheel operated on by lever, and catches to give
the required pitch of teeth in the saw; when the machine is set in motion.
This bracket is also provided, with rack & pinion, also worm and worm wheel,
for raising & lowering as occasion requires. according to the diamiters of the saws.
Upon this bracket are formed vees which fit on the veed slide, upon one side
of the standard; on the top of the standard, over the said rising & lowering
bracket, I fix a specially shaped bracket, carrying two pointed steel centres. on
which oscillates a tee'd (T) shaped lever or arm, in which revolves a steel spindle,
at one end of the said spindle, I place two washers, between which is fixed the
emery wheel, or other kind of milling cutter, to give the desired shape; at the
other end of the spindle is fitted the driving pulley.
This emery wheel or other kind of milling cutter, when fixed is at right angles
to the saw to be sharpened; at the contrary end of the oscilating tee shaped arm,
is attached a flexible spring, flat or otherwise; with a joint at the end to which
is attached a connecting rod, the other end of which is jointed, to a belled cranked
lever, with provisions formed for working into a cam plate, cast to the side of the
driving worm wheel; the motions are obtained by using a worm wheel of suit-
able diamiter, on one side of this wheel, is cast a cam, the path of which gives
the proper movement to the oscilating tee arm carrying the emery wheel, or other
kind of milling cutter: providing a slow movement downwards of the emery
wheel, or other kind of milling cutter, into the tooth whilst cutting; then, a
dwell when it arrives at the bottom of its stroke, to insure the tooth being clearly
cut, then an upward quick return movement, after completion of its work; and
then another dwell, whilst the saw is being moved round for another tooth, to be
operated upon.
On the opposite side of this worm wheel, is fixed a stud, at a proper distance
from the centre, to give the desired movement to the dividing arrangement, for
the accurate pitch of the teeth of the saw this dividing arrangement, is operated
as follows, on the worm wheel, is the stud before mentioned, on which is a con-

page_text: necting rod working on a moveable stud, which is fitted into a double slotted
belled cranked lever, rocking on a stud in a bracket, which is fixed to the
side of the upright standard, the other slotted arm of the belled cranked lever is
fitted with a movable stud carrying the connecting rod; the other end of which
is jointed to the lever, actuating the catches on the ratchet wheel; the double
slotted belled crank lever, is to give accurate adjustment of the movement
required to give the exact pitch of teeth in the saw to be sharpened, the amount
of cut required is regulated by an arrangement of adjusting screws.
The driving worm wheel, is revolved by a steel worm, on the end of a vertical
shaft, running in a suitable bearing; on the opposite end of the shaft is a bevil
pinion, gearing into a bevil wheel, on the end of the counter shaft; which is
supported by two brackets bolted to the upright standard, upon this shaft is the
driving pulley, for driving the emery wheel, or other kind of milling cutter
which is driven by belt; it also carries the fast and loose pulleys, for driving the
machine from the main shaft.
Dated this Sixth day of December 1899.
An Automatic Saw Sharpening and Retoothing Machine for Saws for
Hot Iron and the like.
JOSEPH HILL, St. George's Engineering Works, Woods Lane, Derby, 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 follow-
ing statement :-.
My present invention consists of a simple, and effective, self acting or auto-
matic saw sharpening machine, suitable for sharpening, or retoothing circular
saws, used for sawing hot iron, or steel, or for sharpening other kind of saws.
The machine consists of an upright standard (D). Sheets 1 & 2 upon which
is attached all the various brackets, and parts of the machine.
Down one side of this standard, is formed a vertical veed slide (d), Sheets 1 & 2
on which slides a bracket, or carriage (E), Sheets 1 & 2 having a spindle, with
washers of large diameters fitted into it, which is intended to carry the saw, the
saw being placed, and cramped, to a suitable degree of tightness, by lock nuts,
between the large washers.
On the said spindle, I fix a worm wheel (F), Sheets 1 & 2 which is revolved
by a worm (F), Sheet 1, carried in bearings on the underside of the said
bracket (E), Sheets 1 & 2.
On the same spindle as the worm, is a proper pitched ratchet wheel (G),
Sheets 1 & 2 operated on by lever (S), and catches (S¹ & S³), Sheets 1 & 2 to
give the required pitch of teeth in the saw, when the machine is set in motion.
The bracket (E), Sheets 1 & 2 is provided with rack (T), Sheets 1 & 2 which
is geared with pinion (T), Sheets 1 & 2 and connected on a shaft (V), Sheet 1 on
the end of which is secured a worm wheel (U), Sheet 1 which gears with a
worm (U), Sheet 1 fixed on a suitable shaft having a hand wheel (W), Sheets 1
& 2 this is for raising and lowering it, as occasion requires according to the dia-
meters of the saws.
'
Upon the bracket (E), Sheets 1 & 2, are formed vees, which fit on the veed
slide (), Sheets 1 & 2 upon one side of the standard (D), Sheets 1 & 2.
On the top of the standard (D), Sheets 1 & 2 over the raising and lowering
bracket (E), Sheets 1 & 2 I fix a specially shaped bracket (H), Sheets 1 & 2 carry-

page_text: two pointed steel centres, on which oscillates a tee
et 1 & 2 in which revolves a steel spindle, at one end of the said spindle
e two washers (J & J¹), Sheets 1 & 2 between which is fixed the emery wheel,
ther kind of milling cutter, to give the desired shape, at the other end of the
dle is fitted the driving pulley (K), Sheet 1.
his emery wheel, or other kind of milling cutter, when fixed is at right angle
the saw to be sharpened.
At the contrary end of the oscillating tee shaped arm (I), Sheets 1 & 2 is
the other end of which is
ached a flexible spring, flat or otherwise (K), Sheet 2 with a joint at the end,
which is attached a connecting rod (L), Sheet
nted to a bell cranked lever (M), Sheet 2 with provision formed for working
to a cam plate (M), Sheet 2 cast to the side of the driving worm wheel (N),
eet 2.
The motions are obtained by using a driving worm wheel (N), Sheet 2 of suit-
le diameter, on one side of this wheel is cast a cam (M¹), Sheet 2 the path of
hich gives the proper movement to the oscillating tee arm (I), Sheets 1 & 2
arrying the emery wheel, or other kind of milling cutter, into the tooth while
utting, then a dwell when it arrives at the bottom of its stroke, to ensure the
ooth being clean cut, then an upward quick return movement, after completion
f its work, and then another dwell while the saw is being moved round for
nother tooth to be operated on.
On the opposite side of this worm wheel is fixed a stud (O), Sheet 2 at a proper
distance from the centre, to give the desired movement to the dividing arrange-
ment for the accurate pitch of the teeth of the saw.
the driving worm
This dividing arrangement is operated as follows, on
wheel (N), Sheet 2 is the fixed stud (U), Sheet 2 on which is a connecting rod (P),
Sheet 2 working on a moveable stud (P), Sheet 2 which is fitted into a double
slotted bell crank lever (Q), Sheet 2 rocking on a stud in a bracket (Q), Sheet 2
which is fixed to the side of the upright standard (D), Sheets 1 & 2 the other
slotted arm of the bell crank lever (Q), Sheets 1 & 2 is fitted with a moveable
stud, carrying the end of the connecting rod (Q2), Sheets 1 & 2 the other end of
which is fitted into a suitable joint to the lever (S), Sheet 2 for actuating the
catch (S), Sheet 2 in the ratchet wheel (G), Sheets 1 & 2.
The double slotted bell crank lever (Q), Sheet 2 is to give accurate adjustment
of the movement, required to give the exact pitch of teeth in the saw to be
sharpened, which is done by moving and setting stud (R), Sheets 1 & 2.
As each revolution of the driving worm wheel (N), Sheet 2 is made, the emery
wheel or other kind of milling cutter, is caused to move down into a tooth of the
saw, which is fixed on to the machine, and operates on the tooth by the cam,
0 and lever motions, as already described.
When the emery wheel, or other kind of milling cutter is raised out of the
tooth of the saw, the double slotted bell crank lever (Q), Sheet 2 is operated on by
the fixed stud (0), Sheet 2 in the driving worm wheel (N), Sheet 2 causing the
connecting rod (P), Sheet 2 and lever (S), Sheet 2 to be moved, also the catch (S1).
15 Sheet 2 on the ratchet wheel (G), Sheets 1 & 2 to be likewise moved, which motion
also revolves the worm (F), Sheet 1 and the worm wheel (F), Sheets 1 & 2 upor
the spindle carrying the saw; the saw is therefore made to revolve intermittently
one or more teeth, as may be desired; the amount of cut required, being regu
lated by an arrangement of adjusting screws (X & X¹). Sheets 1 & 2 which ar
50 screwed in, and locked by nuts, in projecting pieces, on the top of the bracket (H
Sheets 1 & 2 fixed on the top of the standard (D), Sheets 1 & 2 already referred t
The pressure of the emery wheel, or other kind of cutter upon the tooth of th
saw, is maintained and regulated, by the before mentioned spring (K¹), Sheet
and adjusting screws (X & X), Sheets 1 & 2.
5.7
Any vibration, or side strain caused to the saw, is obviated by an adjusti
bracket (R), Sheets 1 & 2 in which is inserted an india rubber cushion, or sprin
one of the saw.

page_text: The advantages are, saving of time, greater durability of saw, owing to more
accuracy in sharpening. A saw may be put on the machine and sharpened, with
only the occasional attention of an attendant. The saw is sharpened truer, better,
and superior than by any other method of sharpening saws.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I wish it to be
clearly understood, that I do not confine myself to the exact details herein shown,
and delineated in this specification, and accompanying sheets of drawings, but
that alterations may be required, or made without departing from the principles
of this said invention, I declare that what I claim is: —
1st. The entire combination, and application of parts as substantially described
in this specification, and delineated in the sheets of drawings, accompanying the
same.
2nd. The tensional spring (K¹), Sheet 2 in combination with the oscillating
tee shaped arm, or spindle bearing (I), Sheets 1 & 2.
3rd. The combination of the driving worm wheel (N), with cam plate cast to
it, and the bell crank levers (M & Q), the connecting rods (L & P), and the fixed
stud (0), Sheets & 2 all operated by the driving worm wheel (N).
Dated this Sixth day of September 1900.