Improvements in Machines for Sharpening Saws.
Year: 1896

page_text: Date of Application, 27th May. 1896
Complete Specification Left, 24th Mar., 1897-Accepted, 1st May 1997
PROVISIONAL SPECIFICATION.
Improvements in Machines for Sharpening Saws.
We, ROBERT TAYLOR Junior, Engineer, aud LUKE DUNKERLEY Junior,
Foreman of Saw Mills, both of Asa Lees and Company Limited, Sobo 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 sav filing or sharpening machines and
the chief objects of our improvements are to sharpen the face, clear out the gullet,
and sharpen the top or back of one and the same tooth simultaneously, and during
the time that the emery wheels are being drawn away after grinding the tooth and
before they return into position ready for grinding the next tooth, to automatically
swivel the carriage of each grinding wheel and simultaneously feed the saw forward
one tooth so that the cutting wheels will grind the face and top of each tooth at the
opposite bevels or angles to the previous one.
In carrying our improvements into effect we employ two filing or grinding wheels
one preferably a plate wheel for grinding the face and the gullet of the saw tooth
and the other a cup shaped or conical wheel for grinding the top or back of the
tooth. The slides and carriages of both grinding wheels are moved forward by.
cams and levers or their equivalents so as to grind each tooth on its face and top
simultaneously and the emery wheels are so arranged that their cutting parts pass
across the face and top of the tooth being ground in order to prevent ridging or
grooving either the tooth or the emery wheels. The carriage carrying the
cup shaped emery wheel is mounted upon a compound slide the bottom slide being
arted upon by a cam to move it and the carriage transversely to the saw blade
and bring the grinding wheel up to the saw tooth, after which time a top slide and
the carriage is moved from the same cam or by other means lengthwise of the saw
and carries the emery wheel across the top and past the point of the tooth thus
grinding it; the slide is withdrawn by a weight or equivalent. Upon the bottom
slide is mounted an adjustable plate which is free to be swivelled on a pin secured
to the bottom slide, the centre of which pin is in line with the point of the saw
tooth and the cutting point of the emery wheel while the tooth being ground,
and to vary the bevel ground upon the top of the tooth the carriage is swivelled
automatically for each tooth upon a second pin the centre of which is in line with
the cutting point of the emery wheel and the central plane of the saw blade. This
plate and consequently the emery wheel carriage upon which it is mounted can
be moved round on the pin as a centre at will thus altering the angle of grinding
the top or back of the tooth without materially altering the position of the
portion of the periphery of the cup shaped wheel which is nearest to the plate
grinding wheel.
The slide with the carriage for the emery wheel for grinding the face of
the teeth is also automatically moved io and fro by a cam and lever or equivalent
aud is withdrawn by a weight or spring and the carriage with the emery wheel
is swivelled upon a shaft the rentre of which is in line with the cutting point
of the emery wheel and with the central plane of the saw blade. Suitable means
are employed to, swivel each emery wheel carriage automatically after grinding
each tooth.
We prefer to reverse the direction of rotation of the cutting wheels for each
alternate tooth; the wheels are preferably driven by a single cord and this

page_text: reversal is effected automatically by friction wheels or in other convenient-
manner.
When a straight saw is to be ground the blade is secured to a table which is
moved forward the required distance after each tooth has been ground by an
automatic pusher which acts against the face of the tooth to be ground and moves
it into the correct position; the bed upon which the table moves can be swivelled
in either way to vary the hook of the face of the saw tooth.
Circular saws can be ground upon the machine by mounting them upon a bracket
in which case the table remains stationary.
Dated this 26th day of May 1896.
H. B. BARLOW & GILLETT,
Agents for Applicants.
TUN.
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 objects of our improvements are to sharpen the face, clear out the gullet,
and sharpen the top or back of one and the same tooth simultaneously, and during
the time that the emery wheels are being drawn away after grinding the tooth and
before they return into position ready for grinding the next tooth, to automatically
swivel the carriage of each grinding wheel and simultaneously feed the-saw forward
one tooth, and also reverse the rotation of the emery wheels, so that the cutting
wheels will grind the face and top of each tooth at the opposite bevels or angles t.)
the previous one.
In the accompanying eight sheets of drawings-
Fig. 1, shown on Sheets 1, 2, 3 and 4, represents, in plan, a saw sharpening
machine made according to our invention.
⋅
Fig. 2 is an elevation showing the driving shaft and part of the cam shaft.
Fig. 3 is an elevation of the two emery wheels and their carriages.
Fig. 4 is a detail view of the cup shaped emery wheel and its carriage.
Fig. 5 is an elevation and Fig. 6 a plan of two of the cams, and
Fig. 7 is a detail view of the reciprocating pusher for feeding the saw.
In the drawings,-2 indicates the frame or table of the machine which carries in
suitable bearings 3, the main shaft, upon which is secured a driving pulley 5, a
pulley 6 keyed upon a bush 7 loose upon the shaft 4, and a grooved pulley 8 also
keyed upon the bush and between the pulleys 6 and 8 is also mounted a loose
pulley 9. Upon the belt pulley 5 is placed an open belt which drives the machine
constantly in ove direction, and a crossed belt on the pulley 6 drives by a band on the
grooved pulley 8 the emery wheels in one direction and when, by a belt shifting
mechanism, the crossed belt is moved on to the loose pulley 9 and the open
belt is brought on to the pulley 6 the emery wheels are driven in the reverse
direction, this change of rotation taking place after each tooth of the saw has
been ground.
On the main shaft 4 is keyed a worm 10 in gear with a worm wheel 11 keyed
upon a cam shaft 12, Fig. 2, upon which are keyed five cams; of these the cams 13,
14 and 15 are double cams, while the cams 16 and 17 are siugle. The cam 13 is for
actuating the slides and carriage upon which a cup shaped emery wheel 18 for
grinding the top or back of the saw tooth is mounted while the cam 1+ is

page_text: for actuating the slides and carriage upon which is mounte a plate shapel emery
wheel 19 for grinding the face or breast of the same tooth and gulleting and
grinding the back of the next tooth. The cam 15 is a face cam with two snugs on
it for feeding the saw to be sharpened tooth by tooth. The cam 16 is for tilting
the emery wheel carriages in one direction the return movement being effected by
their own weight while the cam 17 is employed to move the strap forks for the
driving belts in one direction when required against the resistance of a spring which
brings them back. The carriage for the cup shaped emery wheel consists of a
plain slide 20 fitted to slide upon two parallel bars 21 secured in the frame 2, and
upon the slide 20 is mounted a movable plate 22 which is free to be swivelled at
will upon a bolt 23 secured in the slide 20 the centre of the bolt 23 preferably
corresponding with the point of the saw tooth when the slide 20 has finished its
forward movement and the tooth is in position to be ground; the plate 22 is secured
in the desired position upon the slide 20 by bolts 24 and a wing unt on the bolt 23.
On the plate 22 are fitted a pair of parallel bars 25 upon which are mounted a
slide 26 which has an upright face set at a convenient angle as shown in Fig. 3;
on this upright face is fitted a bracket 27 which swivels on a pin 28 the axis of
which is in the same plane as that of the mid-thickness of the saw blade and is
secured in the upright portion of the slide 26. The plate 22 and the slide 26 are
carriel by the slide 20 which carries a lever 34 to which is attached a pin 44
resting in the groove of the cam 13. The pin 44 is secured to the lever 34 by a
set screw, see Fig. 4. The periphery of the cam 13 moves the slide 20 and the
groove in the cam by the pin 44 moves the lever 34 which by its connections draws
the slide 26 across the saw tooth. We prefer to make the pin 44 a separate part
for convenience of renewal as the surface in contact with the cam wears.
bracket 27 has four projections which form slideways for a slide 29 the two back
snugs being behind the vertical face of 27, and the two front snugs being in front
of the vertical face, thus enabling the tail end of the slide 29 to pass through and
behind the vertical face of the bracket 27. The spindle 31 of the emery wheel 18
is carried in the slide 29 and is driven by a band 43 from the grooved pulley 8
passing over a pulley 32 fixed thereon.
The
To compensate for wear of the emery wheel 18 the slide 29 can be fed or adjusted
towards the saw blade by a milled wheel and screw 33, the screw passing through a
fixed eye on the bracket 27 and into an eye on the slide 29. The lever 34 to which
the pin 44 is attached, is centred on a stud 35 carried by the bottom slide 20 and
this lever is secured by a bolt 30 in a slot 36 in a connecting rod 37 which is
pivoted to the slide 26 on a stud 38. On a stud 39 secured to the slide 26 is a
plate 40 which carries a stud 41 on which are mounted two carrier pulleys 42 for
the band 43. The pulleys also act as tighteners for the band 43 which also passes
over other guide pulleys 92, 93 and 94, Sheets 2 and 5.
The carriage 45 for the emery wheel 19 is fitted so as to be free to slide as well
as to turn in two bearings on the main frame 2 of the machine and the centre of
this portion of the carriage is in the same plane as the mid-thickness of the saw
blade and is also in line with the face or breast of a tooth when in the proper
position to be ground and is also the central point of contact of the emery wheel 19
with the face of the tooth when grinding. The carriage 45 is moved up horizontally
toward the saw tooth by the cam 14 acting against the lowest part of a lever 46,
see Sheet 1 and Figs. 5 and 6, pivoted on a stud 48, and is drawn back by a
spring 49. The adjustment of the carriage 45 to suit different depths of teeth on
the saw is effected by means of an adjusting screw 47 which passes through the
lever 46 and acts against a snug on the carriage 45. A bracket 50 provided with
two arms is reduced in diameter at 51 where it is fitted into the carriage 45,
Sheet 4, and through these arms passes the spindle 52 of the emery wheel 19 which
carries a pulley 91 for the driving band 43 by which both the emery wheels 18 and 19
are driven. The position of the bracket 50 and wheel 19 is adjusted by a screw
and hand wheel 53 and the bracket 50 in the carriage 45 is locked by a nut with a
handle 54. The carriage 45 rests by its own weight on a vertical bar 55, see

page_text: Fig. 3, fitted in the bed plate 2, and one end of a rocking lever 56, centred at 57,
is raised by a stud 58 connected to the vertical bar 55 which is actuated by the
cam 16 as hereinafter described so that as the opposite end of the lever 56 is moved
downward the lever 56 through a connecting link 59 draws down one end of a
rocking bar 60 which passes through a boss fulcrumed at 61 on the slide 26,
and at the other end the lever 60 projects through a slot in the bracket 27
consequently when the lever 60 is oscillated the bracket 27 iswivels on its
pivot 28, see Fig. 4.
The snugs on the cam 15, Sheet 1, act against the nose of a lever 62 centred
at 63, Sheet 4, on the bed plate 2, and cause the lever 62 to move sideways twice
for each revolution of the cam. To one end of the lever 62 is secured a screw 64
the head of which comes against the quadrant end of a lever 65 and moves it along
a slideway on a bed 66 on which a table 74 for the saw blade 67 is fitted in
slideways. On the lever 65 and centred on a stud 69 is a pusher 68, see Fig. 7,
which enters the gullets between the saw teeth as the lever 65 is moved forward,
and on returning the pusher dips or tilts as it comes in contact with the back of the
next tooth and regains its working position by the other end of the pusher being the
heavier and falling upon a stud 70 on the lever 65.
The bed 66 swivels on a stud 71 from the centre of which the quadrant on the
lever 65 is struck and the centre of the stud 71 is the point to which the pusher 68
advances the tooth on which it is acting, Sheet 3; this bed can be swivelled in
either direction at will according to the hook or shape required for the face of the
saw tooth, and the pitch of the feed is regulated by a screw 90, Sheet 4, which passes
through the frame 2,-the pusher and lever 65 as well as the lever 62, are brought
back by a spring 72. To the sliding table 74 are secured two adjusting plates 73
and 95, Sheets 3 and 4, for setting the saw in position on the table 74 ready for
grinding; the plate 73 is mounted directly upon the table 74, while the plate 95 is
fitted to be moved along a rod 96 to accommodate different lengths of saws. The
saw is clamped down to the table by thumb screws or bolts 75, of which only one
is shown in Fig. 4, pressing a wooden rail 76 on to the saw.blade 67 which rests
upon a board secured to the table. The thumb screws 75 and the wooden rail 76
are carried by brackets 77 mounted on a shaft 78 which is carried in bearings ou
: the table 74.
The cam 16 acts against a stud 80 secured to a rocking lever 81 mounted
adjustably on a stud 82 fixed to the. main frame 2, Figs. 5 and 6, and forces down
the stud 80 thus rocking the lever 81 and forcing up the vertical bar 55 to which
.it is attached by the stud 58, consequently as the cam 16 rotates the bar 55 descends
with the carriage 45 resting thereon as the stud 80 comes upon the small diameter
of the cam.
The cam 17, Fig. 2, acts upon a lever 83 secured upon a shaft 84 and this lever
is held down upon the cam 17 by a spring, not shown; upon the shaft 84 are also
secured the strap levers and guides 85, 86, Sheet 21 for governing the belts on
the pulleys 5 and 9 respectively; upon the pulley 5 there is an open belt 87 and
upon the pulley 9 is a crossed belt 88; when the strap guide moves the belt 88
when the strap guide 86 moves the belt 88 on to the loose pulley-6 and the strap
guide 85 simultaneously moves part of the broad strap 87 on to the pulley 9 the
motion imparted to the grooved pulley 8 and to the band 43 which drives both
emery wheels will be reversed while the strap 87 will continue to drive the machine
continuously in the same direction:
In operation when a saw blade 67 has been clamped upon the board on the
table 74, see Fig. 4, and the emery wheels have been adjusted to their proper
positions relatively to the saw, the machine is started and the carriage 45 is inoved
up by the cam 14 so that the emery wheel 19 begins to grind the face of the tooth.
Meanwhile the slide 20 actuated by the cam 13 has brought up the emery wheel 18
which traverses across and beyond the point and returns grinding the top of the
tooth while the emery wheel 19 travels along and grinds the face of the tooth and
gullets, and grinds the back of the next tooth. The carriage 45 with the emery

page_text: wheel 19 is then drawn back by its spring 49 and the slide 20 with the emery
wheel 18 by springs 89 coiled on the rod 21. Then the cam 15 through the
lever 62 and screw 64 moves the quadrant 65, Sheet 4, which brings the pusher 68,.
Sheets 3 and 5, up to and against the tooth in front of that which has been
ground and acting on the saw tooth moves it as far as the centre of the stud 71 in
which position the tooth is in the correct position for being ground when the
lever 65 and pusher 68 are withdrawn by the spring 72; while this is being done-
the carriage 45 is raised by the movement of the bar 55 actuated by the cam 16.
to change the position of the emery wheel 19 and simultaneously the movement of
the bar 55 and levers 56, 59 and 60, see Fig. 4, tilt or oscillate the pivoted.
bracket 27 and change the position of the emery wheel 18 so that as the emery
wheels 19 and 18 grind the tooth then in position the angles of the face and top.
cutting edges will be the reverse of those ground on the previous tooth and so on.
at every fresh tooth.
The adjustable plate 22 which is fastened to the bottom slide 20 can be loosened.
at the points 23, 21, and also the connecting bar 37 by loosening the bolt 30 can
be moved at will carrying the emery wheel 18 with it thus altering the angle of
grinding the top of the tooth and making it more obtuse or acute as required.
The centre 23 from which the plate 22 swivels is preferably identical with the
point of the tooth when the bottom slide 20 has received its full forward.
movement.
For grinding circular saws a bracket to which a slotted bar, not shown, is fixed,.
is secured to the table 74, and a stud mounted on this bar forms a centre on which
the eye of the saw is placed; the saw blade rests upon the table 74 and is set in:
position in the same manner as a straight saw by means of the plate 73, Sheet 3,.
so that the pusher 68 acts upon the teeth successively and feeds the saw round
after each tooth has been ground simultaneously by the wheels 18 and 19, the
saw being steadied by the wood rail 76 and the table 74 remaining stationary.
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 a machine for grinding straight and circular saws-
1. A machine constructed so that each saw tooth can be ground on the face.
and the top and gulleted and the back of the next tooth ground practically
simultaneously by two emery wheels substantially as and for the purposes.
described.
2. The combination with mechanism whereby each saw tooth can be simul-
taneously ground on the face and top and gulleted and the back of the uext tooth:
ground, of mechanism for swivelling and traversing the emery wheel carriages
and slides and reversing the direction of rotation of both emery wheels after each.
tooth has been ground substantially as and for the purposes described.
3. The arrangement use and application of the driving belt mechanism herein.
shown and described, or equivalent driving mechanism whereby the machine can
be driven continuously in one direction while the two emery wheels are driven
alternately in opposite directions substantially as and for the purposes described.
4. The general construction combination and arrangement of parts embodying.
our improvements substantially as and for the purposes herein described with.
reference to the accompanying drawings.
Dated this 25th day of March 1897.
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicants..