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Oct. 29, 1946.
C. E. DRAKE
’
‘
MACHINE FOR SHARPENING CIRCULAR SAWS,
MILLING-CUTTERS, AND THE LIKE
Filed Aug. 2, 1943
2,41 0,2 74
4 Sheets-Sheét 1
Oct. 29, 1946.
.
Q E_ DRAKE
_
2,410,274
_MACHINE FOR SHARPENING CIRCULAR SAWS,
MILLING-CUTTERS, AND THE‘ LIKE '_
Filed 'Aug. ‘2,4 1943
‘
53
1
4 Sheets-Sheet 2
11
334
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Oct. 29, 19.46.
C. E. DRAKE
_
'
7 2,410,274
MACHINE FOR SHARPENING CIRCULAR SAWS,
MILLING-CUTTERS, AND THE LIKE .
‘ Filed Aug._ 2.; 1943
4 Sheets-Sheet 3
' 0a, 29, 1946. '
.
c. E. DRAKE
MACHINE FOR SHARPENING CIRCULAR SAWS,
2,410,274
MILLING-CUTTERS, AND THE LIKE
' Filed Aug. 2. 1943
[11/
4 Sheets-Sheet 4
‘
Patented Oct. 29, 1946
2,410,274
UNITED STATES PATENT" OFFICE
2,410,274
MACHINE
FOR
SHARPENING
CIRCULAR
SAWS, MILLING-CUTTERS, AND THE LIKE
Claud E. Drake‘, Brentwood, Mo.
,
Application August 2, 1943, Serial No. 496,995
6 Claims.
(01. 76-40)
1
This invention relates to a certain new and .
useful improvement in machines for sharpening
circular saws, milling-cutters, and the like.
This invention has for its chief object the pro
2
~ A for arcwise shifting the grinding-wheel or
rotary abrader a into and out of the gullets be
tween the respective teeth of the saw, an arbor
as'sembly C readily vertically and horizontally
adjustable relatively to the abrader a, indexing
vision of a machine uniquely constructed for ac
curately and precisely sharpening the peripheral
mechanism D for e?ecting rotary actuation of
teeth of the saw or cutter to a selected contour,
the arbor and supported saw in timed relation
with reciprocations of the abrader a, means, gen
erally indicated E, for effecting horizontal or
which is automatic in operation and exceedingly
?exible in accommodating a wide range of cutter
size} and tooth form or contour, which may be
readily and conveniently selectively set for sharp
ening in succession all the teeth or only every‘
alternate tooth of a particular saw or cutter,
traversing reciprocation of the grinding wheel a
relatively to the particular saw being- sharpened,
and a train of gearing F and a motor M for actu
ating allof the moving or movable parts of the
machine, with the exception of the abrasive
which ‘may be economically constructed, and
~ which is el‘r'icient in the performance of its in
tended functions.
15 wheel a, in timed or synchronous relation.
,
All the parts or components of the machine are
And with the above and other objects in view,
my invention resides in the novel features of form, '
construction, arrangement, and combination of
> mounted directly or indirectly on, and supported
by, a suitable upstanding preferably oblongrectangular casing or housing H comprising a
parts presently described and pointed out in the 20 baseéportion I, a front wall 2', joined to which
claims.
Y
_
In the accompanying drawings (four sheets)-_
[Figure 1 is a front elevational view of a saw
sharpening machine embodying my invention;
Figure 2 is an elevational view of the right
hand side of the machine;
I
Figure 3 is an elevational view of the opposite
,
by a lateral wall 2" is an offset continuation or
extension 2",- a left side wall 3, a right side wall 4,
a rear wall 5, and a top wall 6. It will be under
stood that the housing H, while, for illustrative
25 purposes, here shown as anv integral unit, is in
practice constructed of suitable sections for con
venient, facile assembly.
I
or left-hand sideof the machine; _
As best seen in Figures 1, 2, and 5, the grinding
Figure 4 isa fragmentary broken’ view of the
wheel supporting-carriage A comprises a suitably
machine similar to Figure 1, illustrating parts of 30 located horizontally disposed shaft 1 ?xed at its
the machine in altered or adjusted positions;
rear end in the rear housing-wall 5 and at its
Figures 5 and 6 are enlarged sectional plan
forward end ‘in the front housing-wallcontinua
views of the machine taken approximately on the
lines 5--5 and 6-45, respectively, Figure 1;
Figure 7 is a vertical sectional view of the ma
chine taken approximately on the line 1—1, Fig
ure 2;
Figures 8 and 9 are similar views taken approxi
mately on the lines 8—8 and 9—9, respectively,
Figure 7; and
Figure 10 is a diagrammatic view illustrating
several of the tooth grinding or sharpening oper
ations that may be selectively performed by the
machine.
tion 2", andmounted on the shaft ‘I for both
rocking movement and endwise reciprocation
from front to rear and from rear to front of the
housing H, is a suitably elongated sleeve 8‘.
Suitably ?xed at an end to and upon the for
ward end of the sleeve 8, and projecting outwardly
through a suitable opening, as at 2*‘, in the hous
ing-wall 2’ to endwise extend crosswise of the
front housing-wall 2, is an arm 9 suitably grooved
upon its upper and lower faces, as at c, for dove
tail-slidable connection with a frame l0.
Suitably mounted for rotation in bearings or
‘ Referring now more in detail and by reference 45 bosses I l on the front face of arm 9 and suitably
characters to the drawings, which illustrate a
practical embodiment of my invention, the ma
chine includes a vertically and horizontally ad
justable carriage assembly generally indicated A,
engaging the frame VIII, is a screw-shaft l2
equipped at an end with a manipulating hand
wheel I 3. I
In turn, having suitable sliding connection
forming part of which is a preferably independ 50 with, and disposed upon the front face of, the
ently motor-driven abrasive or grinding wheel a
frame [I], is‘ a block’ [4, and suitably mounted
of a selected size and shape suitable for the sharp
for rotation in the frame l0 and having threaded
ening of a particular disk-saw, cam-operated
connection with the block I4, is a second threaded
mechanism generally designated B forrockably
or screw-shaft l5 also equipped at its upper end
or pivotally lowering and elevating the carriage 55 with a manipulating hand-wheel l6.
2,410,274
4
f.
boss or enlargement is in the lever-arm e and
having connection with the brackets 30, is a
screw-shaft 33 having a manipulating hand
Suitably supported on, and shiftable relatively
to the housing H with, the block it, is a suitable
small prime-mover or motor i1.
Suitably journaled in the block i4, is a small
wheel 3% for selectively shifting the brackets 30
and roller 29 as a unit for positioning the roller
29 either toward or away from the stationary
shaft it, to and upon which the selected abrasive
or grinding-wheel or abrader a is detaohably
secured, shaft 18 being driven at a constant
predetermined or selected speed through a suit!
able beltsand-pulley connection l3.’ with the m0
tor i'i.
pivot shaft 1 for purposes presently appearing,
the other or upstanding arm h of the‘cam-lever
3! and the housing-wall 4' being apertured in
10 registration, as at, 32c, for accommodating the
It will be evident that, as shaft i2 is rotarily
' screw-shaft 33.
actuated through the hand-wheel I3, the block
’ ' ‘As best seen in Figures 5 and 9, the cam-lever
at a selected distance or location relatively'to
cam 26, as will be readily understood. It follows
- Si is formed preferably integrally with a right
14 and its associated abrasive-wheel a will be
angular lateral extension 3%, which, under the
adjustably shifted laterally or horizontally with
respect to the housing H and thereby positioned 15 weight of arm 8', is in constant engagement with
then that, as the rotary drive shaft 20, in opera
the axis-shaft ? for tooth radius grinding, as
tion, rotates the suitably shaped cam 26, the arm
presently more fully appears, and that as shaft
8’ and consequently thesleeve 8 and arm 9 and
i5 is rotarily actuated through the hand-wheel '
simultaneously
the abrasive wheel a will be al
20
it, the block [4 and associated abrasive-wheel a
ternately rocked and thereby angularly or arc
and-motor ill will be adjustably or selectively
wise lowered into and'raised out of the gullets
raised or lowered or shifted vertically with re—
g of successive peripheral teeth t on the saw S
spect to the housing H, for purposes shortly ap
pearing. It may be observed here that thus a
wide range of settings or adjustments of the
abrasive or grinding disk a may be quite readily
being ground or sharpened.
'
Obviously, the external configuration or shape
of the cam 26 is important and must be precisely
designed to meet different requirements in tooth-v
gullet depths and to insure adequate elevation of
25
effected.
As best seen in Figure 7, the motor M is sus
the abrasive-wheel a to allow intermittent in
means of a belt and pulley drive I9 and the train 30 dexing without “burning” the points of the'teeth
of the particular cutter or disk S being sharpened.
of interposed speed-reducing gearing F actuates
In other words, the cam 26 is so designed that
at the proper and desired speed for most efficient
the abrasive-wheel a is slightly raised or elevated
operation a main drive-shaft 26 journaled, as
above the peripheral extremity of each tooth and
best seen in Figures 5 and 9, in suitable bearings
pended from the housing top-wall 6 and by
maintained in that position until the indexing
2i mounted on and projecting inwardly from v
. housing-wall 4.
mechanism D brings the succeeding or following
Fixed on shaft 20 from left to
tooth into grinding position.
right, as viewed in Figure 9, are the ?nal gear 1‘ ,
‘of the speed reduction train F and alsoL for
purposes presently appearing, a bevel gear 22,
wheel a may be so rocked relatively to the rotary
movement of the saw S being sharpened as to
engage the successive teeth 1? thereof for grinding
a gullet and back wall of desired curvature, as
well asalso a so-called land thereon for pur
spaced collars 23 and 24, a gear 25, and a suit
ably shaped cam 26, a so-called “skip-tooth”
cam 2'? preferably integral with a gear 28 being
loosely sleeved and retained on the shaft 28 in
termediate the collars 23 and 24.
M
It may be observed here that, when desirable, *
a change in speed may be effected byany suitable
means, such as, for instance, the transfer of the
belt from the full line to the broken line position,
as shown in Figure '7, as will be understood, and
it should be noted that the gearing F is merely
illustrative of any suitable speed reduction train,
a description of which in detail is here omitted.
Synchronism of the moving parts of the ma
chine being essential for successful operation,
preferably a single prime-mover M is employed
to actuate all of such parts except the abrasive
Obviously, how
ever, by varying the contour of the cam 26, the
i
poses well understood. Each machine will, in
practice, comprise any desired number of differ—
ently or selectively contoured cams 26, which are
readily interchangeable on the drive shaft 28 to
meet the requirements of any particular saw user.
It may be here remarked that, when it is de
sired to sharpen alternate teeth of the saw, the
cam 2? and a suitable speed reduction gear train
are brought into operation. As best seen, in Fig
ures 5, 7, and 9, the lever-arm lit at its upper
extremity is bifurcated to provide a suitable re
56 cess in which is pivotally mounted, as at 34, an
auxiliary cam-plate 35 comprising a vertically
extending portion or leg 35' and a laterally and
wheel a, which latter may rotate at a suitable
downwardly extending portion 35"., Threadedly
speed independently, as will be understood, the
engaging the latter and located directly over the
rockable actuations of carriage A and reciproca
tions of the traversing mechanism E, in syn 60 screw 33 and presented at an end outwardly
through a suitable opening 36 in housing-wall 4,
chronization with the indexing apparatus D, be
is a short horizontal screw-shaft 31 provided with
ing thus effected from the motor M as the single
a manipulating hand-wheel 31*‘, as shown.
source of power.
Screw-shaft 31 passes threadedly through the
As best seen in Figures 5, '7, and 9, the tubular .
shaft or sleeve 8 is preferably integrally formed 65 leg 35” of the auxiliary cam-plate 35 and, when
rotarily actuated in one direction, will at its in
with a laterally extending relatively wide arm
ner extremity impinge upon the presented face
8’ having a smooth flat under face, as at (Z, and
of the lever-arm h and at the same, time will tilt
at its face (I rests, and is reciprocable both
the leg 35' to engage the “skip-tooth” cam 21.
lengthwise and crosswise, upon a roller 29 jour
naled for rotation upon a pair of suitably spaced 70 Conversely, upon opposite rotation of the screw
angular brackets 30 mounted for slidable adjust
shaft 31, its extremity will be withdrawn from
ment in a way provided in'the upper face of an
arm e of a bell-crank ‘lever 3| pivotally mounted,
same time leg 35" will be swung out of engage
as at 32, upona bracket 325L ?xed upon the hous
ing-wall 4, as shown in Figure '7.
engagement with the: lever-arm h and at the
‘ment with the f‘skip-tooth” cam 21. The latter
Engaging a 75 setting is‘ had when each succeeding tooth of the
2,410,274
*5
particular cutter S is to be sharpened; the former
is had when only every other tooth of the par
ticular cutter S is to be sharpened or ground.
It should here be noted that, whenever the
“skip-tooth” setting is had, cam-plates 3i and
35 function as a unit with respect to cam ‘21, so
connection, as at 53, with the outer reduced end
ofan oscillatory horizontally disposed member 54
having a shape or contour best seen in Figure 7.
Such member 54 is yoked at its inner end for
piVot-pimconnection, as at 55, with a bearing
bracket 56, in turn, secured to and projecting
from housing-wall 5, said'member 54 at its outer
that any movement imparted to the auxiliary
cam-plate 35 will be likewise imparted to the
end-portion projecting outwardly of the housing
primary cam-plate 3| , which latter, as previously
H through a suitable opening 57 formed forthe
mentioned, controls the up-and-down or rock 10 purpose in the housing-Wall 3.
.
able reciprocations of the grinding-wheel a.
Approximately centrally, the member 54 is pro
As also previously stated, the “skip-tooth” cam
vided with an opening, as at 54’, which, as best
2-‘! is loose or sleeved on the main drive shaft 25
seen in Figure’ 7, not only accommodates the
and hence is freely rotatable thereon. Said cam
elongated sleeve 8 reciprocable on shaft 1', but
21, however, must rotate at precisely one-half 15 ‘also a ring 58 welded or otherwise secured to the
the speed of rotation of the main drive shaft 20,
sleeve 8, and projecting from the ring 58 and
as will be understood, and this exact reduction
loosely seated in slots 59 in the opposite side bars
is obtained by means of a gear train which‘ in
54a of oscillatory member 54, is a pair of prefer
cludes the gear 28, a gear 38~of reduced diameter
’ ably integral diametrically opposed pins ‘60 for
meshing therewith, and a gear 39 of a larger 20 imparting endwise movement to the tubular-shaft
diameter in mesh with the smaller diametered
8 on rockable actuations of the member 54.
gear 25 ?xed on the main shaft 29. Gears 38 and
‘ The structure C for mounting and positioning
39 are rigidly ?xed and supported on a relatively
the disc-saw or cutter supporting arbor in proper
short shaft 45 journaled in bearings 4| projecting
spaced relationship with the abrasive wheel a will
from housing-wall 4, as best seen in Figures '7 25 now be described. As best seen in Figures 1, 4, 6,
and 9.
and 7, 6| designates an angularly shaped arbor
The particular peripheral shape of cam 26 is
supporting member, which comprises a horizontal
such as to meet the requirements for sharpening
or table portion 6|’ and a depending or leg por
an unlimited number of cutters having similar
tion 6 l ”.
teeth, and consequently cams of modi?ed shape 30 ' At its portion 61f , the member 6! is preferably
may, as has been stated, be substituted to meet
integrally formed upon its upper face with a boss
the requirements for sharpening cutters or disk
or enlargement 6|a providing a bearing for the
saws having teeth likewise modi?ed, as will be
smooth portion of a relatively long screw-shaft
understood. The peripheral shape of cam 21,
62, which projects at one end outwardly of the
however, is such, it may be mentioned, that its
housing H through an elongated slot ‘63 in hous
high point or lobe 27’. is farther removed from
ing-wall 4 and has ?xed thereon a suitable ma
the axis of shaft 25 than is the highest point of
nipulating hand-wheel 64.
the lobe which may be formed on any one of
the cams 26 selectively employed for a particular
type of saw.
'
In the event that a number or plurality of cir
cular saws are to be tooth generated or tooth
sharpened at one and the same time or in the
event that a milling-cutter of substantial width
or thickness is to be tooth generated or sharpened,
At its portion 6i”, the member BI is mounted
for vertical sliding movement in a dovetail-slide
way formed by a pair of suitably spaced co
operating strips 85 secured to housing-wall 4 as
by screws 66 or the like.
.
>
The‘ desired elevation of support BI is readily
ob-tainable‘by rotation of a hand—wheel 61 rigid
on the outwardly projecting end of a short shaft
then it becomes necessary that the rotary grind
68 journaled in a bearing in housing-wall 4, as
ing-wheel be caused to also travel transversely of
best seen in Figure 4. ‘Fixed to and upon the
the particular saws or cutter. The means E, best
other or inner end of shaft 68, is a bevel-gear
seen in Figures 1, 3, 5, and 7, for such purpose,
69, which is in mesh with a similar gear 19 ?xed
that is, for reciprocating the abrasive or grind 50 to and upon the upper end of a vertically disposed
ing-wheel a transversely across the face of the
screw ‘H, which passes threadedly through a de
teeth of the particular cutter will now be de
pending boss 61b of the support 6! and which,
scribed. Driven by the motor M, as by a belt and
at its lower extremity ‘H’, is rotatably supported
pulley assembly 42, is a shaft 43 mounted in suit
in a bearing block 12 projecting inwardly from,
able bearings 44 located on the top housing-wall ~
and bolted or otherwise secured to, housing
6 and suitably extended to support adjacent hous
Wa1l4,
ing-wall 3 a ?xed variable pulley 45 co-operable
The horizontally disposed portion iii’ of sup
by means of a belt 45 with a similar pulley 4'! on
port 5i is given added strength and rigidity by
a stub-shaft 41' suitably j ournaled on housing H,
one or more integral webs or braces 6!”, as shown,
whereby changes in the driven speed of the latter (30 and is provided along the greater portion of its
may be had by shifting belt 46, as well under
lateral margins with suitable ways Sid for sup->
stood.
porting a slidable base or platform 13, upon the
Integral with or suitably secured to the vari
upper face of which are suitably ?xed bearings
able pulley member 41, is a suitable disk 48 pro
14, 14, for the arbor or cutter-supporting shaft
vided with a series of spaced threadedly aper
~ 0. As best seen in Figure '7, the elongated screw
tured or recessed bosses 49, each occupying a dif
shaft 52 has threaded connection with platform
ferent position radially outwardly from the axis
l3, and hence lateral movement of the platform
of the disk 48. Engaging a suitable screw or the
‘F3’ in either direction may be conveniently effect
like 50 projecting through a journal-member 5|
ed by rotation of hand-wheel 64.
of aconnecting-strap or reciprocating rod 52 with 70
The indexing apparatus D forms the subject
any selected one of such bosses 49 will effect a
variation in the reciprocal travel or stroke of such
rod and consequently also of the grinding-wheel
a, as will now be apparent.
matter of, and is ‘illustrated and described fully
and in detail in my co-pending application,
Serial No. 492,558. Hence a detail description
thereof is here omitted, reference in that regard
The connecting rod or strap 52 has a pivota 75 being made to my said'copending application
2,410,274
7
8
be understood that, since all of such adjustments
Suffice now to say that such apparatus intermit
tently rotarily shifts the particular saw or cutter
are screw-controlled, precision and accuracy are
readily, conveniently, and positively obtained.
being sharpened in one direction through arcs of
Further, by suitable manipulation of the hand
wheel
33%, the disk or roller 29 is selectively
is supported in spaced bearing brackets '15 de
shifted outwardly or inwardly of the housing H
pending from the shiftable platform 13 and is
and relatively to the under face (1 of the lever or
driven by bevel gearing, as at 16, in turn driven
arm
8' for thereby shifting the fulcrum with re
by the main shaft 29 through meshing engage
spect to the arm 8’ for correspondingly varying
ment between bevel gearing TI and gear 22, the
gear 16 having meshing connection with a gear 10 the extent of rocking movement of the shaft or
sleeve 8 on the shaft 1 for precisely gauging the
18 having shiftable key-connection, as at 19,
rise and fall or arcwise reciprocations of the
with a vertically disposed driven shaft 80 jour
grinding-wheel a into and out of the teeth-gul
naled in suitable bearing brackets 81 and longi
lets g, in co-operation with the intermittent timed
tudinally slotted, as at 89’, for the purpose.
indexing action of the mechanism D.
A suitable opening 82 is formed in the front
It follows that, as the drive shaft 2!] is caused
housing-wall 2 through which the arbor C pro
to rotate, the cutter or saw S is rotatably actu
jects, and the latter is provided with any suit
ated intermittently or step by step through and
able means, such as indicated at 83, for selectively
by the indexing mechanism D and, in timed 0r
and removably mounting thereon the peripher
20 synchronous relation, the rotary grinding~wheel
ally toothed cutters 0r saws S to be sharpened.
a, independently driven by the motor I1, is shift
Before now describing the full operation of the
ed arcwise downwardly into and out of the tooth
machine, it is to be noted that the pulley 41, when
gullet g, whereupon the cutter S is again rotarily
the grinding-wheel a is to be caused to traverse
actuated by the indexing mechanism D suffi
the particular cutter or saws being sharpened, is
freely rotatable on the stub-shaft 41’, However, 25 ciently to dispose a succeeding tooth into sharp
precise predetermined extent. Such mechanism
ening position.
normally, as it may be said, or when merely a sin
gle saw S is being tooth sharpened or tooth gen
However, if a plurality of saws or a cutter of '
some width or thickness are being sharpened at
erated, traversing action of the grinding-wheel a
is omitted, as has been previously stated, In such
one and the same time, then, by disposing the
thumb-screw or like member 59 in a selected
event, the pulley 41 is ?xed, as by means of a
thumb-screw or the like 41" engaged with the
shaft 41' and either belt 42 disengaged from shaft
43 or belt 46 disengaged from pulley ill and thus,
in turn, through the rigid link connection 52 and
slot-and-pin connection 59, 60, the tubular-shaft
threaded socket 139 of the pulley 48, the member
54 will be rocked on its pivot or fulcrum 55, and
through the slot and pin connection 59-439, the
rock-lever 8 will be shifted endwise on the shaft
35 1 and also on the roller 29 inwardly and out
8 and its associated parts are retained or secured
from endwise reciprocation on the ?xed shaft 1.
In use and operation, let ‘it be assumed that a
circular or disk-saw S, indicated in dash lines in
wardly with respect to the housing H, whereby
the cross-arm 9 and its carried grinding-wheel
a will correspondingly be caused to traverse the
width or thickness of the particular saws or cut
ter S being sharpened, the amount of such trav
40
Figure 1 and diagrammatically and fragmentally
in full lines in Figure 10, is to be sharpened and
that the cutting faces of its respective teeth t are
‘not only of “hook” form, but are additionally
arcuately formed, as at t’, from their gullets g
to their points p.
,
Such saw S being properly mounted on the
arbor C, the precise degree of so-called “hook”
and the desired arcuate radius thereof having
been mathematically or otherwise accurately pre
determined, and tube or shaft 8 being retained,
as has been described, from endwise reciprocation
on shaft 1, traversing action of the grinding
wheel a being unnecessary, the screw-shafts 62
and T8 are ?rst rotarily actuated by means of
suitable turning movements imparted thereto by
their respective hand-wheels 64 and B1 and the
arbor C and supported cutter S thereby shifted
vertically and horizontally with respect to the
housing H for accurate peripheral engaging rela
erse movement being varied by selectively locat
ing the thumb-screw 59 in one or the other of
the sockets G9, and the speed of such traversing
movement being also selectively varied by shift
45 ing the belt '46 into one or the other of the
cones Lil.
Under such circumstances, it like-wise follows
that, as the drive shaft 29 is caused to rotate,
the saw S is rotatably actuated intermittently or
step by step through and by the indexing mech
anism D, and in timed or synchronous relation,
the rotary grinding-wheel
a, independently
driven by the motor I1, is shifted ?rst arcwise
downwardly into a tooth gullet g, then caused
to traverse such gullet g, and then shifted out
wardly of such gullet g, whereupon the cutter S
is again rotarily actuated by the indexing mech
anism D sufficiently to dispose a succeeding tooth
i into sharpening position and the grinding-wheel
a then caused to follow the same tooth sharpen
tion with the abrading-wheel 11. Thus the ma 60 ing paths, and so on throughout the entire pe
chine may accommodate saws or cutters of a wide
riphery of the particular saw S. Thus any num
diametrical range and the arbor C conveniently
ber of like saws may be quickly and efficiently
positioned relatively to the grinder a for obtain
ing the desired hook.
sharpened without any further adjustment in any
the hand-wheels l3 and IE5, the grinding-wheel
In this connection, and having reference spe
cifically to Figure 10, in which a: indicates the
arcuate path of the abrasive-wheel a in a tooth
Then, through suitable rotary manipulations of
a may be further vertically and horizontally ad
justably shifted with respect to the pivot-shaft
of the mechanism of the machine.
I
sharpening operation, it will be understood that,
7 for obtaining the proper degree of radius cut
the desired tooth curvature t’ be of small
ting in the teeth t of the particular saw S, or, in 70 should
or acute radius, as at r, the carriage A with its
other words, by shifting the wheel 0 toward or
grinding-wheel a are shifted toward the axis of
from the axial line of the shaft 1, the degree of
the pivot or rock-shaft ‘I, as shown in broken
radius cutting by the grinder a in the teeth t will
lines. If a more pronounced curvature Or a cur
be greater or less as may be necessary to meet the
requirements of any particular saw. And it will 75 vature of more obtuse radius, asat 1", is desired,
2,410,274
10
then the carriage A and the wheel a will be po
No skill or experience is required of the operator
sitioned outwardly in, selected greater spaced
to obtain proper tooth shape when changing from
distance or relation to the axis of the shaft l.
one lot of saws or cutters to another having dif
, ,It will be seen that the machine is so ?exible
ferent pitch and gullet depth.
in providing for adjustments in locating the po CR ‘ ._ Instead of varying the speed of each indexing
sition ‘of the arbor C, of the carriage A, and of
stroke (allowing the wheel to dwellin- the gullet,
the grinding-wheel a, as well as also in the ex
then increasing the speed of indexing to ?atten
tent of travel of the grinding-wheel a relatively
off the tooth point or “land”), the'machine em_
to the particular cutters,- that the machine will
ploys a constant, unvarying rate of speed
readily accommodate, and e?'iciently} and quickly
10 throughout the indexing stroke, the rate of speed
effect sharpening of, cutters of various diameters
and shapes or contour of teeth. For example, in
Figure ‘10, cutters or saws'of four different sizes
of raising the grindingewheel a being slowed to
grind the land. This movement is inherent in
the» grinding~wheel actuating cam, and hence
are shown, with the arbor C andthe grinding
requires no delicate co-ordination of wheel and
Wheel a selectively located'for obtaining the de-_ 15 index controls by the operator. This feature as
.siredtooth hook and radius. A smaller diam»
sures any desired tooth shape with overall uni
etered cutter S1 may be'sharpened as precisely
iormity, and economizes in time in “setup.”
and accurately as a larger diametered saw S2
The machine simpli?es the control of. the de
Within the range of adjustments providedr'by the
gree of “land” ground on the tooth. The opera
machine, the unlimited grinding scope‘ inherent
20 tor merely selects the degree of land to be
in the machine being evident from a comparison
of the saws S3 and S2 or S3 and S. From such
comparison, the wide'scope or range of saw tooth
ground, and no prolonged, delicate timing or
co-ordination of controls is required.
’
The machine ful?lls in every respect the ob
sharpening obtainable in the present machine is
jects stated, and it is to be understood that
quite apparent.
25 changes and modi?cations in the form, construc
It may also be observed that more than one
tion, arrangement, and combination of the sev
saw or cutter suitably mounted in aligned re
eral parts of the machine may be made and sub
lation on the arbor C may be simultaneously
stituted for those herein shown and described
sharpened, the particular grinding~wheel 1! icewithout departing from the nature and principle
ing properly sized and its traversing movement 30 of my invention.
being gauged accordingly, and, as has been
n.
Having thus described my invention, what I
tioned, by manipulating the hand-wheel 373,
claim and desire to secure by Letters Patent is:
rocking up-and-down and traversing movements
1. In a machine for sharpening circular saws
of the brasive-wheel a may be lengthened with
and the like, a rockable shaft, an arm ?xed to and
respect to the indexing travel of the particular 35 rockable with the shaft, an abrasive-wheel sup
saw S, so that merely alternate teeth of the par
ported for rotation by the arm, an arbor for sup
ticular saw S are sharpened during a full rotary
porting the saw to be sharpened, means for r0
cycle thereof.
It might also be mentioned that, by substitut
ing di?erently shaped cams 2%, the amount and
relative speed of swinging movement of the
abrasive-wheel a during an indexed or rotary
movement of a particular saw may also be selec
tarily actuating the arbor and supported saw,
and means for rocking the shaft and arm for
arcwise shifting the wheel into and out of en
gagement with the periphery of the saw, said last
means including a second arm ?xed on the shaft,
a pivoted bell-crank lever having actuating con
nection with the second arm, and a rotary cam.
tively varied for generating or sharpening teeth
of different tooth contour, and that, by disen 45 having peripheral engagement with the bell
gaging belt 46, the grinding-wheel a may be
crank lever.
manually shifted in a traversing operation.
2. In a machine for sharpening circular saws
It may be added that the machine, while here
and the like,a rockable shaft, an arm ?xed to
more particularly described in connection with
and rockable with the shaft, an abrasive-wheel
the sharpening of the teeth of the saw or cutter, 50 supported for rotation by the arm, an arbor for
may very efficiently be used and employed in
initially generating teeth of selected contour and
rotarily actuating the arbor and supported saw,
radius upon the periphery of a circular disk or
and means for rocking the shaft and arm for arc
cylindrical cutter-body.
supporting the saw to be sharpened, means for
‘wise shifting the wheel into and out of engage
The machine eifects the production of a tooth 55 ment with, and for selected arcuate distances
form by a simpli?ed mechanical action, truly
into, the periphery of the saw, said last means
automatic and not dependent upon the skill of
including a second arm ?xed on the shaft, a
the operator in coordinating various controls.
pivoted bell-crank lever, a shiftable actuating
Further, index plates are eliminated, a universal
connection between the bell-crank lever and said
indexing apparatus especially designed for and 60 second arm, and a cam for pivotally actuating
built into the machine accurately indexing for
the bell-crank lever.
any pitch on any diameter cutter or saw. The
3. In a machine for sharpening circular saws
operator counts the teeth in the tool to be’ ground
and the like‘, a rotary abrasive-wheel, an arbor
and sets the index accordingly. Also, pivoted
for supporting the saw to be sharpened, and
side suspension of the grinding-Wheel assembly
means for causing the wheel to reciprocate
provides for the up and down movement of the
through selected distances crosswise of the sup
grinding-wheel ona curve, the radius being easily .
ported saw, said means including a rockable
adjusted. Obviously, this design brings radius
member, a pulley provided with a series of sock
grinding on the face of the tooth under positive
ets at selected radial distances from its axis, and
control and uniformity, eliminating the need of
a link having connection at one end with the
wheel dressing to produce curved tooth face.
rockable member and having connection at its
Tooth contour is formed on this machine in
opposite end with a selected socket.
a practical manner. Reproduction of a given
4. A saw sharpening machine comprising a ro
tooth shape is a matter of mechanical selection,
tatable arbor, means for securing the saw to be
eliminating the human element and guesswork.
sharpened ,rigidly upon the arbor, means con
2,410,274
nected to the arbor for rotatively advancing the
arbor in successive steps, an arm projecting over
and in substantially parallel relation to the plane
of the saw when the latter is mounted on the
arbor, said arm being pivoted for rockable move
ment about an axis parallel to the axis of the
arbor,‘ said arm further being transversely shift
able'along said axis, a power-driven grinder car
ried by the arm, means for rapidly reciprocating
the arm to and fro along said axis during grind 10
ing operations, means for simultaneously rocking
12
driven in timed relation to the driving means
whereby to generatively grind a saw tooth hav
ing a predetermined contour depending upon the
shape of the cam, and means for reciprocating
the grinder longitudinally with respect to said
axis during its tooth generating movement.
6. A machine for sharpening saws comprising
an arbor for supporting the saw to be sharpened,
an arm-like frame pivoted for rocking movement
about an axis parallel to and spaced from the
arbor, a cross-head shiftably mounted on the
' frame for movement toward and away from the
the arm, and means for synchronizing the rock
axis thereof, a power driven rotary grinder shift
able movement of the arm and its supported
ably mounted on the cross-head for movement in
grinder in relation to the rotary movement of the
a direction transverse to the direction of move
arbor.
ment of the cross-head, driving means for rotat
5. A machine for sharpening saws comprising
ing the arbor, and a cam operably connected to
an arbor for supporting the saw to be sharpened,
the frame and driven in timed relation to the
an arm-like frame pivoted for rocking movement
driving means whereby to generatively grind a
about an axis parallel to and spaced from the
arbor, grinding means shiftably mounted on the 20 saw tooth having a predetermined contour de
pending upon the shape of the cam.
frame for movement toward and away from the
axis thereof, driving means for rotating the
CLAUD E. DRAKE.
arbor, a cam operably connected to the frame and
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