Improvements in Machines for Sharpening Saws.
Year: 1895

page_text: Date of Application, 29th July, 1895
Complete Specification Left, 29th Apr., 1896-Accepted, 30th May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Machines for Sharpening Saws.
We, ROBERT TAYLOR, Junior, Engineer, and LUKE DUNKERLEY, Junior,
Foreman of Saw Mills, both of Asa Lees and Company Limited, Soho Iron Works,
Oldham, in the County of Lancaster, do hereby declare the nature of this invention
to be as follows:-
Our invention relates to improvements in saw filing or sharpening machines, and
the chief object of our improvements is to render such machines self acting in
regard to the successive sharpening of every alternate tooth of the saw blade,
taking each race or series of teeth separately.
In carrying our improvements into effect we employ two filing or grinding tools
one preferably a saucer shaped emery wheel for sharpening the face or front of the
tooth and the other preferably a cup shaped emery wheel for grinding the top of
the tooth. Each of these wheels is rotated and moved forward in slideways by a
revolving cam or equivalent to grind a tooth, and the cams are preferably so timed
that both wheels are grinding simultaneously and further the movement of the cup
shaped wheel is so arranged that its cutting or grinding part passes across the
part of the tooth being ground in order to prevent ridging or grooving either the
tooth or the wheel.
The blade of the saw to be ground, when a straight saw, is laid upon a travelling
table or carriage which is actuated intermittently, that is to say, it remains
stationary during the grinding operation and is then moved forward the required
distance so as to bring a fresh tooth or fresh teeth into position for the emery
wheels. One race or series of teeth are sharpened in one traverse of the table, and
after the table has been returned by hand or otherwise to its initial position or
nearly so it is re-started and the other series of teeth are then sharpened.
In grinding a circular saw the eye of the saw is placed upon a stud fixed in a
bracket secured to the table, the tops or the faces of the teeth are first ground all
round the saw and then the table is moved to bring the other parts of the teeth
opposite the other wheel so as to grind them, the saw being moved intermittently
in any convenient manner.
In order to back off the tops of the teeth of all saws the cup shaped emery wheel
is mounted on a spindle which is carried in a bracket which can be swivelled from
a point preferably in line with the centre of the plates of the saw.
The emery wheels are provided with the usual means for setting and for
adjustment to compensate for wear.
Dated this 27th day of July, 1805
H. B. BARLOW & GILLETT,
Agents for Applicants.

page_text: Improvements in Machines for Sharpening Saws.
We, ROBERT TAYLOR, Junior, Engineer, and LUKE DUNKERLEY, Junior,
Foreman of Saw Mills, both of Asa Lees and Company Limited, Soho Iron
Works, Oldham, in the County of Lancaster, 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 :-
Our invention relates to improvements in saw filing or sharpening machines, and
the chief object of our improvements is to render such machines self acting in
regard to the successive sharpening of every alternate tooth of the saw blade,
taking each race or series of teeth separately.
In carrying our improvements into effect we employ two filing or grinding tools
one preferably a saucer shaped emery wheel for sharpening the face or front of the
tooth and the other preferably a cup shaped emery wheel for grinding the top of
the tooth. Each of these wheels is rotated and moved forward in slideways by a
revolving cam or equivalent to grind a tooth, and the cams are preferably so timed
that both wheels are grinding simultaneously and further the movement of the cup
shaped wheel is so arranged that its cutting or grinding part passes across the part
of the tooth being ground in order to prevent ridging or grooving either the tooth
or the wheel.
The blade of the saw to be ground, when a straight saw, is laid upon a travelling
table or carriage which is actuated intermittently, that is to say, it remains
stationary during the grinding operation and is then moved forward and required
distance so as to bring a fresh tooth or fresh teeth into position for the emery
wheels. One race or series of teeth are sharpened in one traverse of the table, and
after the table has been returned by hand or otherwise to its initial position or
nearly so it is re-started and the other series of teeth are then sharpened.
In grinding a circular saw the eye of the saw is placed upon a stud fixed in a
bracket secured to the table, the tops or the faces of the teeth are first ground all
round the saw and then the table is moved to bring the other parts of the teeth
opposite the other wheel so as to grind them, the saw being moved intermittently
in any convenient manner.
In order to back off the tops of the teeth of all saws the cup shaped emery
wheel is mounted on a spindle which is carried in a bracket which can be swivelled
from a point preferably in line with the centre of the plate of the saw.
The emery wheels are provided with the usual means for setting and for
adjustment to compensate for wear.
And in order that our invention may be fully understood and readily carried into
effect we will describe the accompanying eight sheets of drawings reference being
had to the figures and letters marked thereon.
Fig. 1 is a front elevation, Fig. 2 a plan, Fig. 3 a side elevation and Fig. 4 an
end elevation of the bed and table of a machine for sharpening straight or frame
saws made according to our invention, and Figs. 5 and 5 are detail views of parts
of the same.
Fig. 6 is a side elevation and Fig. 7 a plan view of an attachment for sharpening
circular saws.
Referring first to Figs. 1 to 5, -a is the bed plate and frame of the machine
and 6 the main table or carriage fitted in slideways on the bedplate a; a saw b¹ is
shown on the table 6 in Fig. 2, in position for being sharpened; the bed plate also
supports the carriages for the two emery or other grinding wheels, and brackets a¹
which carry the driving shaft c with a fast and loose pulley c¹ c²; on this shaft

page_text: are secured two cams d and e. Mounted upon the bed plate a is a plate a² with
slideways a the plate a² being pivoted on a pin a secured to the bed plate, see
Figs. 1 and 2; a headstock fis fitted on the slideways a³ and to this headstock
is fitted a faceplate 9 the parts ƒ and g being connected together by an eccentric
lock bolt which passes through a boss on f and through the heads of two
bolts which project through slots in the faceplate g; spring or other washers f³
on these bolts 2 allow the plate g to be moved upon a pin f* secured to the
headstock f. The axle of an emery wheel g¹ is supported on screws 9² which pass
through arms 98 on the faceplate g and carry wheels g4 which are locked by spring
pawls go for adjusting the position of the cutting wheel g' to compensate for wear.
A handle secured to the faceplate g carries a block arranged to be moved into
either of two notches of cut in the edge of the headstock f and to be locked
there by moving a handle f on the lock bolt f¹; more than two notches could be
made infif desired.
In order to regulate the traverse of the headstock and faceplate g we employ
an adjustable screw i fitted in a projection on f against which screw the cam d acts
to move forward the parts mentioned and when the enlarged diameter of the cam
has passed the screw i the headstock, faceplate and emery wheel are drawn back
by a weight suspended from a rope which passes over a pulley f8 and is fixed to
the headstock f.
A second headstock k is fitted upon a compound slide / mounted upon the base-
plate a so arranged that the headstock can be moved forward in one direction by
the cam e on the shaft c and in the reverse direction by a weight and also receive
a cross movement as described later; to the headstock k is secured a pin k¹ and a
faceplate m is pivoted on the piu k¹ and connected to the headstock by an eccentric
lock bolt which passes through the heads of two bolts m² the screwed ends of
which project through slots in the faceplate m; washers and nuts on these bolts
permit m to turn upon the pin k¹.
The spindle n of a cup shaped emery wheel n¹ is carried in bearings m¹ on the
faceplate m and in order to set this emery wheel a hand lever o secured to mis
placed in a notch k or k³ made to receive it on the edge of the headstock k, and
can be locked in position by moving the handle k³ on the bolt k².
When the hand lever o is placed midway between the notches k*k the centre of
the spindle n the centre of the pin k¹ and the point of contact between the emery
wheel and the saw tooth are all in the same plane as the centre of the saw
blade so that it follows when the lever o is moved from the notch into ko or
vice versa the bevel ground upon the tops of the alternate teeth will be the same, as
shown in Fig. 5ª.
To adjust the spindle n and bring the emery wheel n¹ into its proper position
when worn a set screw in a pulley n² on the spindle is slackened a lock nut n³ on a
tail pin n and the pin n' turned to move forward the spindle n and wheel n¹ after
which the pulley is screwed against the bearing and secured by the set screw and
the lock nut tightened.
Upon the end of the shaft c is a bevel wheel c³ which gears into a bevel wheel p
mounted upon a shaft p¹ carried in bearings secured to the bedplate a; on the
shaft p is secured an eccentric 9 with a strap q' connected by an adjustable bolt to
a pink fitted in a slide 7 set obliquely to the spindle n, the eccentric 9 moving the
slide headstock k and faceplate m and emery wheel n' across the top of a saw
tooth.
Secured to the end of the shaft p¹ is a cam p³ which acts against a pin r secured
to a feeding bar r guided at one end by the shaft p' and carrying at the other end
a frame in which is fitted a screw ; a nut on this screw has pivoted to it a ratchet
pawl or catch which gears into ratchet teeth 63; the screw abuts against an
adjustable screw which passes through a bracket a secured to the bed plate a and
the end of the screw 2 is kept up to the screw (when the cam p has released r)
by a spring.
A saw b¹ to be sharpened is laid upon a board placed on the table 6 with the

page_text: points of the tooth at each end of the saw placed one against a stop and the-
other against a stop y as setting points; the saw is clamped in position by a plate w
and screws w¹, is then drawn under the saw blade and y is turned back out of the
way of the saw blade; a vertical bar u, see Fig. 4, is raised by a foot lever u¹ and
caused to move up in the gullet between two teeth and against the face say of the
end tooth of the race or series to be ground; a hand wheel v on a shaft to which
is secured a pinion in gear with a rack 63 on the table 6 is turned to the right
until the face of the tooth is pressed against the bar u, a milled head on the
screw is now turned until the catch or pawl ³ is pressed hard against the teeth
of the rack &.
Previous to grinding, the table a² is adjusted on the pin a' in order that the
wheel g¹ may grind the teeth with the required hook, the bevel of the cutting face
being regulated by placing the handle h in one or other of the notches in the
headstock f; in the same manner the faceplate m is adjusted on the pin k to cause
the wheel n to grind the right bevel on the top of the teeth when the handle o is
placed in the notch and the same amount of bevel will be ground upon the
intermediate teeth when the handle o is moved into the notch *; any desired.
number of notches can be made in k for the handle o.
Motion is communicated to the cutting wheels g¹ and n¹ by bands, not shown,
which pass over pulleys 98 and n² on the wheel axles.
In operation, after a saw blade has been clamped on the table b, the headstock f
is fed forward by the cam d down or across the face of the tooth which it grinds
with the necessary hook and bevel, at the same time the headstock / is fed forward
by the came to the top of a separate tooth and then k is drawn across the top or
back of the tooth from the front to the back by the eccentric q so as to grind the
tooth after which k is returned by the weight 3 and eccentric q.
The camp acting upon the pin r moves it and the feeding bar r¹ thus causing
the pawl in the rack 62 to traverse the table b the distance of two teeth when the
cams d and e and eccentric g again actuate the headstocks and k; these actions
are continued until all the teeth in one race or series of alternate teeth have been
sharpened. The hand wheel is then turned to traverse the table b back to the
initial position when the rod u and other parts are moved to set the saw ready for
grinding the other series of teeth and the emery wheels are re-set by simply moving
the handle from the slot fe to f' and the handle o from k to k.
In sharpening circular saws as illustrated by Figs. 5 and 6 the table 6 is
stationary the catch being thrown out of gear with the rack 63; secured to the
table b is an adjustable bracket 2 to which is bolted a slotted bar 3 which carries
a stud 4 on which a circular saw 6 to be sharpened is mounted, this stud can
be placed in any position to suit the size of saw or' shape of tooth and is
not necessarily in line with the pin a; an adjustable stationary lever 5 is pivoted
on the stud 4 and its flattened end rests against the blade of the saw for the
purpose of steadying it while being ground; the feed given to the saw overcoming this
pressure. A feed lever 6 is pivoted to the frame at 7 and is connected with the
feeding bar at 8 actuated by the cam p², shown in Figs. 1 to 5, when the face of
the saw teeth are being ground by the emery wheel g¹. When the tops of the teeth
have to be ground the feed lever 6 is moved and pivoted to the frame at 9 and
connected to the feed bar r¹ at 10. The top of the feed lever works upon a
pin 11 and when the lever is at rest or feeding the saw it bears against a shoulder 12
but when in the act of being drawn back a neb 13 pivoted on the pin 11 is depressed
in consequence of its being against the lower surface of the saw blade. The
neb 13 is small enough to pass between the teeth or in the gullet of the saw and
it is drawn up into its highest position by a spring 14 pulling the top part down
on to the shoulder 12. The vertical rod u is worked by a foot lever, not shown,
for circular saws in the same manner as described for straight saws. The line 16,
Fig. 6, represents the upper surface of the bed plate a and the pin a which passes
through the projection on the plate a² and is secured to the bed plate a allows
the position of the plate a² to be moved and adjusted so as to vary the hook on
:

page_text: the face of the saw teeth. The other motions for cutting the bevel on the face
and tops of the teeth are the same as for straight saws.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In machines for sharpening saws-
1. The combination with the travelling saw table or carriage, of two emery
wheels, one preferably saucer shaped for sharpening the face or front of the tooth
and the other preferably cup shaped for grinding the top of the tooth said wheels
being arranged and operated substantially as and for the purposes herein set forth.
2. The combination with a headstock such as mounted upon a slide and
pivoted on the bed table and carrying a faceplate and grinding wheel, of a head-
stock such as k mounted upon a compound slide and carrying a pivoted faceplate
and grinding wheel, all arranged and operating substantially as and for the
purposes herein set forth.
3. The combination with a saw to be sharpened, of an emery wheel mounted
on a spindle capable of being swivelled from a point in line with the centre of
the plate of the saw to one side or other to back off the tops of the two series
of saw teeth substantially as herein described and particularly with reference to
Fig. 54.
4. The several combinations and arrangements of parts embodying our improve-
ments substantially as herein described and as illustrated by the accompanying
drawings.
Dated this 28th day of April 1896.
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicants.