Improvements in Machines for Sharpening and Setting Saws.
Year: 1895

page_text: Date of Application, 22nd July, 1895
Complete Specification Left, 21st Apr.. 1896-Accepted, 23rd May, 1896
Communicated from abroad by MASCHINEN-FABRIK "PERFECT," A G of 5/6 Grosse
Theaterstrasse, Hamburg, in the Empire of Germany.]
Improvements in Machines for Sharpening and Setting Saws.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
The present invention relates to improvements in machines for sharpening saws
The object of the present
by means of a file and for setting the teeth of the saws.
invention is to combine in a superior manner and in a single machine all the
mechanisms which are necessary to performing the several operations involved in
filing and setting saws so as to automatically effect the sharpening and setting of a
saw in a uniform and reliable manner.
The improved machine constructed according to the present invention comprises
means and devices for operating the file, for supporting and advancing the saw
to be filed, for actuating the saw setting device and for carrying and advancing
the saw which has been filed or which is required to be set between the setting tools
or implements.
The means for operating the file consist of a main shaft journalled in a suitable
standard or standards of a base-plate and adapted to impart by means of a crank
dise and connecting-rod a reciprocating motion to the file-carrier sliding on a
suitable guide-bar. This guide-bar adapted as a double-armed lever is suspended
on a pivot of a suitable standard and acted upon by a cam fixed on the main
shaft so that the guide-bar, the rear end of which being under the action of a
suitable spring or other yielding means, receives an oscillating motion on its pivot.
The relation between the crank-disc and the cam being such that at the inward-
stroke of the file-carrier the outer end of the guide-bar swings upwards in order
to lift the file-carrier and the file and to release or liberate it from the teeth of the
saw so that the latter is capable of being advanced according as the pitch of the
teeth requires, whilst at the outward-stroke of the file-carrier the front end of
the said guide-bar moves downwards, whereby the file engages the saw-teeth thus
performing the sharpening of the latter with a yielding pressure.
The saw is held by an adjustable support provided with suitable jaws and hinged
to the base-plate so that the saw that is to say the teeth of the saw may be presented
to the file at any required angle. The advancing or feed of the saw is effected by
a feed-pawl engaging with the teeth of the saw and being attached to a bell-crank
lever operated by means of an oscillating lever which receives its oscillatory motion
from the eccentric crank-disc in due time. In order to reverse the feeding motion of
the saw two of such feeding-mechanism may be provided, one at each side of the
base-plate.
The setting-device to be combined with the above described filing device, is also
arranged on the said base-plate and it mainly consists of a suitable suspended
oscillating lever having bifurcated prongs or arms embracing the edge of the saw to
be set and being provided with adjustable setting-tools for setting or slanting the
teeth laterally from the plane of the saw, alternately to the right and left according
as the said bifurcated lever is oscillated to the right or left. Motion is imparted to

page_text: this lever by means of a cam keyed on a separate shaft. For advancing the saw-
blade which is supported by a suitable support a feeding mechanism may be employed
similar in construction to that above described for feeding along the saw under
the file.
The hereindescribed machine may be used without any modification for sharpening
all kinds of straight saws provided that files are employed which correspond to the
peculiar shapes and sizes of the teeth.
The sharpening of circular saws requires a somewhat modified form of the support
and jaws for holding the respective saw to be filed without departing by this modification
from the gist of the invention.
For this purpose the support hinged to the base-plate may be provided with an
adjustable pivot or the like upon which the circular saw is to be placed with its
central opening and secured in proper position by means of suitably formed jaws
attached to the said support. The feed of the circular saw is effected by a suitable
feed-pawl which engaging with the teeth of the circular saw turns the latter on its
pivot as may be required.
Dated this 22nd day of July 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Machines for Sharpening and Setting Saws.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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. :-
'
The present invention relates to improvements in machines for sharpening saws by
means of a file and for setting the teeth of the saws.
The object of the present invention is to combine in a superior manner and in a
single machine all the mechanism which are necessary to perform the several
operations involved in filing and setting saws so as to automatically effect the
sharpening and setting of a saw in a uniform and reliable manner.
The improved machine constructed according to the present invention comprises
means and devices for operating the file, for supporting and advancing the saw to
be filed, for actuating the saw setting device and for carrying and advancing the
saw which has been filed or which is required to be set between the setting tools or
implements.
In the accompanying drawing:
Figure 1 is an end view,
Figure 2 is a plan and
Figure 3 is a side view, partly in section, of my improved sharpening and setting
machine for saws;
Figure 4 is a similar view to Figure 3 showing the operative parts in a different
working position ;
Figure 5 illustrates the setting device;
Figures 6 to 8 illustrate the mode of sharpening a saw ;
Figure 9 shows a somewhat modified arrangement for supporting circular saws;
Figures 10 to 12 represent different forms of saws which may be sharpened by the
improved machine.
Similar letters refer to similar parts throughout the several views.
The means for operating the file consist of a main shaft c journalled in a
suitable standard or standards a¹ of the base-plate a provided with fixed and
loose pulleys 6 and 6 and adapted to impart by means of a crank disc d d' and
connecting rod e a reciprocating motion to the file-carrier f sliding on a suitable

page_text: guide-bar g. This guide-bar adapted as a double-armed lever is suspended on a
pivot of a suitable standard a² and acted upon by a cam c' fixed on the main
shaft c so that the guide-bar g, the rear end of which being under the action of
a suitable spring or other yielding means, receives an oscillating motion on its
pivot.
As shown in the drawing this yielding means for instance consists of a lever i
pivoted at to the standard a². At the free end of the lever i a spring actuated
bolt is provided upon which rests the rear end of the lever g by means of a
pin g. By adjusting the thumb screw 3 on the bolt acting upon the spring *
wound around the bolt h¹ the levers g and i embracing the main shaft c may
thus be caused to press with more or less pressure against the said main shaft c;
thus the spring securing a reliably yielding connection between the two
levers 9 and i. The cam c when running through the lower half of its path or
circle (Figure 4) moves the rear end of the lever g downward, while during the
upper half of its path the said cam c' acts upon the lever i (Figure 3) in order to
draw up the previously depressed lever g with a yielding pressure. The relation
between the crank-disc d and the cam c¹ being such that at the inward-stroke of the
file-carrier the outer or front end of the guide-bar 9 swings upwards in order to
lift the file-carrier and the file f' and to release or liberate the latter from the teeth
of the saw k so that the latter is capable of being advanced according as the pitch of
the teeth requires, whilst at the outward-stroke of the file-carrier f the front end
of the said guide-bar 9 moves downwards, whereby the file f¹ engages the saw-
teeth thus performing the sharpening of the latter with a yielding pressure.
The saw is held by an adjustable support mounted upon a plate which is
provided with suitable jaws 33 and hinged at r to the base-plate a so that the
saw bladek may be presented to the file at any required angle and the backs X
of the teeth filed at an oblique angle, (see Figures 6-8). The support pinay
be adjusted in height by a screw spindle and fixed in the proper inclined
position by means of a set screw (Figures 4 and 5) being attached to the
machine plate or frame a and engaging a slotted guide rail 78 of the saw support.
The advancing or feed of the saw k is effected by a feed-pawl q* engaging with the
teeth of the saw and being attached to a bell-crank lever q q' operated by means
of an oscillating lever p¹ pivoted at at which receives in due time its oscillatory
motion from the eccentric crank-lisc d acting upon a roller p of the lever p'. For
properly regulating the feed of the saw blade according to the different length or
width of the teeth the feed pawl may be adjustably arranged at the head of the
lever arm and adjusted therein by means of an adjusting screw 93. In order to
reverse the feeding motion of the saw two of such feeding-mechanisms may be
provided, one at each side of the base-plate.
The setting-device to be combined with the above described sharpening or filing
device, is also arranged on the base-plate a and it mainly consists of a suitably
suspended oscillating levers (Figure 5) having bifurcated prongs or arms s² 53
embracing the edge of the saw to be set and being provided with adjustable
setting-tools for setting or slanting the teeth laterally from the plane of the saw,
alternately to the right and left according as the said bifurcated lever s is oscillated
to the right or left. Motion is imparted to this lever by means of a cam n keyed
on a separate shaft m having loose and fixed pulleys m¹ and m² and adapted to act
alternately upon the inner arms ss of the lever s. For advancing the saw-blade
which is supported by a suitable support a feeding mechanism may be employed
similar in construction to that above described for feeding the saw under the file..
In the example shown in the drawing the saw k' is supported by a guide rail k and
moved along between a fixed jaw v' and a movable jaw provided with an adjusting
screw by means of a feeding pawl t t engaging the saw teeth and being
operated upon by a lever n. The latter receives its motion from an oscillating
5 lever n³ upon the pressure-roller n² of which acts a suitably shaped cam n' of the
shaft m. By the revolution of the shaft m or the cams and n¹ respectively the
lever and the levers n³ n' are oscillated in such a manner that after the slanting

page_text: operation of one tool the saw advanced for one tooth by the feeding pawl tt¹
operated by the lever nt whereupon the other tool s2 slants or sets the next tooth in
opposite direction, and so on.
The hereindescribed machine may be used for sharpening all kinds of straight saws
provided that files are employed which correspond to the peculiar shapes and sizes
of the teeth.
.
In the foregoing the operation of the sharpening machine is described with
reference to saws having rectangular or ordinary pitch teeth. When a saw k¹
_ provided with slight pitch or cross-cutting-teeth (Figure 10) is to be filed it is
only necessary to use a file corresponding to this peculiar form of the teeth.
When saws with teeth having their cutting faces set forward as (Figure 11) or
saws with gullet or brier teeth as (Figure 12) are in question the respective saw
blades and must be passed along under the file in such an inclined direction
that the cutting faces z are always in a vertical position (Figures 11 and 12) in
order to allow the file to operate or file in the same manner as in filing ordinary
pitch teeth.
The sharpening of circular saws requires a somewhat modified form of the
support and jaws for holding the respective circular saw to be filed. For this
purpose the support hinged to the base-plate may be provided with an adjustable
pivot or the like upon which the circular saw is to be placed with its central
opening and secured in proper position by means of suitably formed jaws attached
to the said support. The feed of the circular saw is effected by a suitable feed
pawl which engaging with the teeth of the circular saw turns the latter on its
pivot as may be required.
For sharpening circular saws with gullet teeth the saw support may preferably
be modified in the following manner. The support with jaws shown in Figures 1-5
is replaced by a plate (Figure 9) provided with slots www and attached to
the base plate a. Within one of these slots, for instance in the slot w', is mounted
an adjustable slide block y carrying a supporting pin y' for the circular saw k³ to be
filed. The left or right hand slot w¹ or w³ may be used according as the teeth are
.to be sharpened from the left or from the right side. The middle slot w may also
be used for sharpening rectilinear or straight saws for which purpose the support 1
shown in Figures 3-5 is to be mounted in the middle slot w of the plate r³ by means
of a suitable set screw.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. In saw sharpening machines in which the reciprocating file carrier of the file
is carried by a yielding and vertically oscillating guide bar the arrangement that the
supporting device for the saw blade is hinged to the base plate upon an axle arranged
at right angles to the direction of the file stroke, whereby it is rendered possible to
present the saw to the file at any required angle and to file saw teeth with inclined
or oblique back faces, substantially as and for the purpose set forth.
2. The combination of a saw sharpening machine with a saw setting device, in
which the saw blade advanced by steps is held between a fixed and a movable
jaw and is set or slanted by the oscillation of the setting-tools, consisting of two
cams keyed on a separate driving shaft, one of the said cams imparting motion
to the lever carrying the setting tools, the other operating the feeding pawl of
the saw by means of suitable oscillating levers, substantially as and for the purpose
specified.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.