IMPROVEMENTS IN MACHINES FOR SHARPENING SAW BLADES
Year: 1884

page_text: I EMIL MOSSBERG of Elfkarleo Sweden Engineer do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN MACHINES FOR SHARPENING SAW
BLADES" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of this Invention is to avoid using files in sharpening the teeth of
saw blades in frames, or those of circular saws secured on their shaft, and to
execute this work more rapidly and cheaply than can now be effected by means
of files.
This machine has the appearance shown in Fig. 1. The motive power is
transferred to the pulley a fixed on the shaft b; the said pulley is shaped so as to
form also a friction wheel gearing together with the friction wheel d on the shaft e,
on the opposite extremity of which the sharpening cone f is secured. The shafts b
and e are supported by bearings connected by the bow g. In order to keep the
two friction wheels in continual gearing one with another, either only a pressing
screw is adapted on the extremity of the shaft bor a spiral spring. The
sharpening cone fis fixed on the shaft either so that the extremity of the shaft e
passes through the cone and is secured outside of this by means of a nut, or the
cone may be screwed on the extremity of the shaft, or if preferred a particular
spindle can be cast in the cone, which spindle can then be secured to the shaft.
The transmission of motion to the pulley a, which of course may be executed in
several manners, is represented by Fig. 2 in plan, and by Fig. 3 in elevation. The
shaft i which is parallel with the axis of several saw frames placed one abreast of
the other obtains its motion by the pulley h. From the shaft i the power is
conducted farther by the conical gearing k and the coupling box to the shaft m
further from the pulley n to the pulley o on the transmission bar A fixed on the.
shaft p.. On the shaft p is also a pulley q' from which a string passes to the
pulley a Fig. 1. The sharpening apparatus is suspended in the string between
the pulleys q' and a, and is conducted by the workman seizing with his hands the
frame of the apparatus at t and w. In pressing the apparatus slightly downwards
the string is strained, and by means of the swinging transmission bar A each saw
blade in the frame is accessible to the sharpening cone.
In order to guide the cone so that it does not get out of the plane of the saw
blade, there is partly an iron r, bent to the side and attached to the frame, this iron
being during the sharpening operation conducted along the side of the saw blade,

page_text: partly a guide bar s pivoting in that bearing of the shaft p, which is secured in the
transmission swinging bar A. This iron s has at the bottom the shape of a fork
encompassing the frame, this fork preventing the apparatus from getting in an
oblique position with regard to the saw blade.
Instead of securing the pulley and the sharpening cone on two different shafts,
they may also be placed on a coinmon shaft as shown by Fig. 4. Figs. 5 and 6 are
sections on lines respectively x x and y y¹ Fig. 4. The pulley a is attached
v is a guide
directly to the lower extremity of the shaft c of the sharpening cone.
pulley, the shaft of which is supported by bearings on the top of the frame. The
purpose of this guide pulley is to guide the string which drives the pulley a into
the groove of this latter pulley in all its different positions. Fig. 7 represents part
of the handle t provided with cams for guiding it in the guide bar s.
In lieu of a cone, which during the sharpening operation is introduced between
the teeth of the saw blade, even a disc may be used which is introduced between
the teeth as represented by Figs. 8 and 9.. The disposition of the apparatus will
The di-c is more suitable for
then be somewhat different than when using a cone.
sharpening circular saws. The designations of this disposition refer to those
already described. The sharpening cones or discs are made thus: about three
volumes finely sifted sand or emery and about one volume finely crushed gum-lac,
resin, or another suitable binding matter are mixed together and cast in an iron
The mould has the shape of the cone or
mould which previously has been heated.
the disc to be produced, and in the midst of the mould a spindle is attached in
order to form such. a hole in the cone or in the disc as is wanted for securing it to
the shaft. Then the composition is subjected to a strong pressure and cooled,
whereafter the cone is ready for use.
I reserve to myself the right to undertake such modifications in detail as will
not affect the nature of the invention.
Having now articularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is:-
on
A. machine for sharpening saw blades fixed in a frame, or circular saws secured
a shaft, consisting of a sharpening cone or disc f, attached to a shaft e,
supported by a frame g, and which is moreover by suitable dispositions so
con-tructed that the shaft of the sharpening cone or disc will during the operation
be continually in the plane of the saw blade, and likewise the manufacturing of the
sharpening cones or discs requisite for this apparatus, substantially as described
above and represented in the annexed Drawing.
....
Oth
of March 1881