Improvements in Saw-filing or Sharpening Machines.
Year: 1893

page_text: Date of Application, 25th Jan., 1893
Complete Specification Left, 25th Oct., 1893-Accepted, 25th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Saw-filing or Sharpening Machines.
I RICHARD FLECK of 31 Chaussee-strasse Berlin in the Kingdom of Prussia and
Empire of Germany Manufacturer do hereby declare the nature of my invention
to be as follows :-
1
The invention relates to improvements in saw-filing or sharpening machines and
its object is to render such machines selfacting in regard to the successive filing or
sharpening of the teeth of the saw-blade and automatically to reproduce or copy
the desired form to be given to each tooth from a model or template so that all the
teeth are alike in shape and size.
The cutting or grinding tool employed is the usual revolving emery wheel
carried by an oscillating adjustable lever supported by a movable model or
template.
The saw blade is arranged as usual upon a table with adaptability to be traversed
lengthwise.
Upon the table is also mounted a rock-shaft actuated by an adjustable rotating
crank driven by a main shaft.
The rock-shaft is furnished with a bifurcated-lever to one arm of which is
adjustably fixed the above mentioned model or template which supports and raises
and lowers the emery wheel and upon the other arm of which bifurcated lever is
mounted an adjustable pusher which is adapted to move the saw-blade forward the
distance of one tooth during which operation the tooth under treatment is sharpened
or ground.
If the bifurcated lever is oscillated in one direction the saw-blade is moved in
the same direction and the tooth is properly shaped but if the bifurcated lever is
moved in the opposite or return direction the saw-blade remains stationary and the
rotating emery-wheel is moved downward thereby cutting or filing the straight front
portion of the tooth whilst with the next forward movement of the saw-blade the
cutting or sharpening of the back of the next tooth is effected and so on.
The machine is adapted to file either straight or circular saw-blades.
Dated this 25th dox of Tenue 1893
WHITE & WOODINGTON,
27, Southampton Buildings, London, Agents.
COMPLETE SPECIFICATION.
Improvements in Saw-filing or Sharpening Machines.
I RICHARD FLECK of 31 Chaussee-strasse Berlin in the Kingdom of Prussia and
Empire of Germany Manufacturer do hereby declare the nature of my invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
The invention relates to improvements in sawfiling or sharpening machines and
its object is to render such machines selfacting in regard to the successive filing or
sharpening of the teeth of the saw-blade and automatically to reproduce or copy
the desired form to be given to each tooth from a model or template so that all the
teeth are alike in shape and size.
The cutting or grinding tool employed is the usual revolving emery wheel
carried by an oscillating adjustable lever supported by a movable model or

page_text: The saw blade is arranged as usual upon a table with adaptability to be traversed
lengthwise.
Upon the table is also mounted a rock shaft actuated by an adjustable rotating
crank driven by a main shaft.
The rock shaft is furuished with a bifurcated lever to one arm of which is
adjustable fixed the above mentioned model or template which supports and raises
and lowers the emery wheel and upon the other arm of which bifurcated lever is
mounted an adjustable pusher which is adapted to move the saw blade forward the
distance of one tooth during which operation the tooth under treatment is sharpened
or ground.
If the bifurcated lever is oscillated in one direction the saw blade is moved in
the same direction and the tooth is properly shaped but if the bifurcated lever is
moved in the opposite or return direction the saw blade remains stationary and the
rotating emery-wheel is moved downward thereby cutting or filing the straight
front portion of the tooth whilst with the next forward movement of the saw-blade
the cutting or sharpening of the back of the next tooth is effected and so on.
The grinding wheel is sometimes caused to grind the backs of the teeth
alternately sloping.
The machine is adapted to file either straight or circular saw blades.
And in order that the said invention may be more clearly understood and readily
carried into effect I will proceed aided by the accompanying drawings more fully
to describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation of a machine constructed according to the present
invention.
Figure 2 is a front elevation thereof.
Figure 3 is a top view thereof.
Figure 4 is a diagram representing the motions of the grinding wheel to produce
alternately sloping backs to the teeth.
As the general arrangement of a saw-filing or grinding machine is well known
the present description will be confined as far as possible to the novel features
forming the subject of the present invention.
The filing or grinding tool employed consists of the usual emery-wheel A driven
from the main shaft W carrying driving pulleys V by a strap or band passing over
two guide pulleys in the customary way and which are mounted upon the
carriage-part E of the main frame D.
Upon the main-shaft W is formed or fixed a worm s gearing with two worm-
wheels and of which may be thrown out or in gear as required for the
purpose hereinafter described.
The horizontal shaft W upon which the worm-wheel r is fixed, carries upon its
front-end a crank disc h fitted with an adjustable crank pin Z.
By a connecting rod t the motion of the crank pin Z is transmitted to a lever /
fixed upon a shaft e mounted in bearings upon a projecting table; and gives to the
shaft a rocking motion.
Upon the shaft e is fixed a second but bifurcated lever or arm f carrying upon
the one arm a pusher o and on the other an adjustable steel piece constituting the
model or template.
The pusher o catches in the teeth of the saw to be sharpened and which is
adjustably fixed in the usual manner to the tablej moving the saw blade forward
the distance of one tooth at each oscillatory movement of the arm f.
In order to adjust the pusher o to the proper pitch of the saw the stroke of the
crank pin Z of the crank disc is made variable.
A double armed lever B bearing the emery wheel A oscillates upon studs or
axes bb carried by ears from the turn table C attached to the carriage E sliding to
and fro upon the top of the frame D and adapted to be held stationary when the
sliding motion is not required.

page_text: The plane of rotation of the grinding wheel A can be varied and such wheel is
partially counterbalanced by the weighted lever g in such manner that it still has a
tendency to descend.
On the lever B is fastened an adjustable steel blade u bearing by reason of the
downward tendency of the lever B upon the model or template a attached to the
arm f.
If the pattern face of the model or template r is shaped to the form of an arc
concentric with the centre of motion of the arm the grinding wheel A will remain
in its normal position.
But if the pattern face of the model or template z is shaped to the form of a
straight or curved wedge the lever B and therefore the grinding wheel A will have
imparted thereto an ascending motion as soon as the arm / oscillates from right to
left this takeing place simultaneously with the motion of the pusher o and of the
saw S in the same direction.
The cutting edge of the grinding wheel A will therefore produce upon the back
of the saw tooth a plane as the result of these two motions.
It follows that the shape to be given to the back of the saw tooth may be
determined in advance by giving to the model or template the corresponding
shape.
The grinding wheel therefore uniformly reproduces as many times as is required
a single tooth corresponding to the shape of the model or template x.
It might be considered advisable to grind the backs of the teeth alternately
sloping even if they were set.
For this purpose the grinding wheel must not work in the central plane of the
saw blade but for one tooth it must work in a plane behind and for the next one
in a plane before the blade as represented in Figure 4.
To accomplish this motion automatically the worm wheel r' is thrown into gear
with the worm whereby its vertical shaft m and gear wheels n n' having a speed
of two to one turn the crank disc p a half revolution whilst it and the shaft w
makes one revolution.
The adjustable crank pin p' is connected by a connecting rod q to the
carriage E.
It will therefore be seen that for each alternate oscillation of the arm and of
the pusher o the carriage E will make a complete traverse to and fro transversely
of the saw blade S and the face of the tooth back will accordingly be formed
slanting alternately to the rear side of the saw or to its front side the shape of
the back of the teeth depending upon the pattern face of the model or template r.
As before stated the carriage E may be held stationary but it is advisable
always to employ its reciprocating motion.
If the bifurcated arm fis traversing its back stroke the blade S remains motionless
whilst the cutting edge of the grinding wheel A descends describing a vertical
plane corresponding to the straight front portion of the tooth.
According to the more or less inclined position of the plane of the grinding
wheel the breast of the teeth will be ground inclined also.
As soon as the last tooth of a straight saw blade has been ground the feed of the
blade S automatically ceases so that it is unnecessary to stop the machine exactly
at this moment.
For grinding or filing circular saw blades the well known device for holding
such blades is attached to the machine: the new arrangements for antomatically
grinding remaining as herein before described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An automatic saw filing or grinding machine in which the position of the
grinding wheel (A) is dependent upon and regulated automatically by a model or

page_text: template (x) during the forward movement of the saw blade and also whilst it is
stationary substantially as shown and described.
2. In an automatic saw filing or grinding machine of the character referred to
in Claim 1 regulating the stroke of the pusher (o) and of the bifurcated arm (f)
carrying the pusher (o) and the model (c) by adjusting the crank pin (Z) of the 5
crank disc (4) substantially as and for the purpose set forth.
3. In an automatic saw-filing or grinding machine of the character referred to
in Claim the movable carriage (E) carrying the grinding wheel (A) in combina-
tion with means for automatically traversing the carriage (E) transversely of the
saw blade in manner substantially as herein shown and described and for the
purpose stated.
Dated this 25th day of October 1893.
WHITE & WOODINGTON,
27, Southampton Buildings, London, Agents.