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Патент USA US2118967

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i May 31, 193s.
,.-_ w_ CURWS
A
2,118,967
CUTTER GRINDER
Filed Oct. 17. 1934
2 Sheets-Sheet l
Fig. l
)g
INVENTOR
ATTORNEY
May 31, l938._
F. W. CURTIS
2,118,967>
CUTTER @BINDER
Filed oct. 17, 1954
2 sheets-sheet '2_
2,118,967
Patented Mayl3l, 1938 I
UmuD-STATES
PATENT " OFFICE
2,118,961
CUTTER dimmen
>Frank W. Curtis, Wauwatosa, Wis., assigner to
Kearneyv & Trecker Corporation, West Allis,
Wis.
Application october 11, 1934,~ serial No. 748,630
5 Claims. _ (Cl. 51-125)
unit 3 provides a grinding wheel spindle 6 upon »
which is mounted the rotor of van electric motor
generally denoted by the numeral 1, and an
abrasive grinding wheel 8 ñxed to the front end
of -the spindleadjacent to the- cutter support.
This invention relates generally to machine
toolsand more particularly to. grinding machines.
It is an object of the invention to provide a
«grinding machine of a type particularly adapted
5 _for grinding milling cutters having improved ri
gidity of support of the cutter to be ground and
-the grinding wheel and an improved relation
ship of supports for relative adjustment and for
relative grinding movement of the cutter and
10
wheel.
-
'
.
»
' The cutter supporting unît 2 includes various
relatively movable supports as follows: slidably
guided on base I_for reciprocatory movement in
a path transverse to the axis of wheel spindle 6
' is a cutter supporting slide or support 9 upon 10
.
A further object is to improve thel mounting
of the grinding wheel and its driving means, par
ticularly in a manner to avoid or minimize dis
tortion or displacement which might disturb the
15 desired relationship of the grinding Wheel and
the cutter during the grinding operation, and in
a manner to avoid vibration or chatter.
A further purpose is generally to simplify and
.improve the construction and operation of cut
2 O ter grinders and especially to provide an` im
proved supporting structure for the grinding
`wheel spindle and the cutter carrying spindle of
a cutter grinder, and still other objects and ad
vantages will be apparent from the description'
25 and claims herein.
The invention consists of the construction and
combination of partsv as herein-illustrated and
explained, andin such modiñcation thereof as
may be equivalent to the structure set forthV in
30 and deñned by the claims.
The same reference characters have been umd
to designate the same parts throughout the
drawin-gs and description.
'
In the drawings:
3_5
.
-
»
Fig. 1 is a view in right-handside elevation oi
' a grinding machine in which the invention is in
` corporated.
.
Fig. 2 is an enlarged“ partial section and ele
vational view of the same machine taken along
40 line 2-2 in Fig 1.
Fig. 3 is a view in longitudinal section takenl
along line 3--3 in Fig. 2, showing a portion of the
lower structure.
-
>
_
’t
Fig. 4 is a view in cross section taken along
45 line 4-4 of Fig. 1.
s
The’cutter grinding machine comprises a base
I upon which is mounted a cutter supporting unit
generally denoted by numeral 2, and a grinding
which a cutter carrying bracket or support I0' is
mounted to be adjustable angularly about a ver
tical axis. Support I0 carries a cutter spindle
support II slidably guided for vertical adjust-'
ment, in which the horizontally disposed‘cutter - 5
carrying spindle 4 is rotatably mounted. Support
9 may be moved by the means of a hand crank,
not shown, applied to the squared end -of screw
I2 which engages a nut I3, and may be clamped
in any- position of adjustment by a clamp screw 20
I4.
Support I0 may be rotated by the means of ‘
a' crank, not shown,'applied to the squared end
'of a shaft I5, which turns a worm I6, engaging
a Worm wheel I1 fixed on the lower- end of the
support as best shovm in Fig.. 4, and may be
vertically by the means of a hand crank, not
shown, appliedl to the squared end of a screw 20.
which engages with a nut 2 I, and may be clamped
in any position of adjustment by the means of a
-T-bo‘t 22. The spindle 4 may be rotated, as previ
ously noted, by the hand wheel 5. This serves
to turn the cutter mounted at the other end of
the spindle in a step-by-stepOmotion to present 35
the diiïerent teeth of` the cutter to thegrinding.
, Wheel successively for sharpening. To locate the
individual teeth in the proper position of _ rota
tion there is provided a tooth rest 23 4mounted for
universal movement and adjustment about a rod
24 which in turn is pivoted in'a member 25_ slid
ably adjustable on a member 26 fixed with the
support II, the memberl 23 being clampable in
any position of its adjustment by anyvsuitabvle
means such as the bolts and nuts shown.-
Abrasive wheel unit 3 includes various rela
tively movable supports as follows: Slidably
guided on base I for movement in a direction at
right angles to the path of the cutter support 9
wheel unit generally denoted by numeral 3. Sup- .
is a ñrst support or grinder supporting slide 21
` porting unit 2 provides a rotatable cutter carry
`upon
which a second support or bracket 28 iS.
ing spindle `4 which at the one _end is provided
with a hand wheel 5 for rotation thereof,- and
at the other end is provided with an exposed por
tion upon which the cutter to be ground is mount
edA for rotation coaxial with the spindle. Wheel
25
clamped in any position of adjustment by the
means of T-bolt-s I8. Support II may be adjusted
slidably guided for movement in a path at right
angles to the path of movement of the ñrst
support 21. Pivoted on support 28 for movement
about a horizontal axis on a pivot pin 29 is a 55
.
2
2,118,967
grinding wheel spindle carrier or third support
30.
'I'he support 21 may be moved by a hand
wheel 3| ñxed on a screw 32 engaging a nut 33
and may be clamped in any position of adjust
ment by the means of a screw 34 operating sim
ilarly to the clamp screw |4. 'I'he support 28 may
be reciprocated by a hand wheel 36 ñxed on a
shaft 31 upon which is also fixed a spiral pinion
38 engaging a rack 39 on the lower surface of
10 the second support 28, as shown in Fig. 3. It
is this hand wheel 36 which is normally used
for traversing the grinding wheel 8 relative to
the cutter mounted on spindle 4. The support 30
15
may be manually shifted about the pivot 29 by
grasping the support and shifting it bodily, but
for ñne adjustments there is provided supple
mental adjusting means best shown in Fig. 2 in
cluding a screw member 40 pivoted on a clamp
ing bolt or stud 4| ñxed in the support 3D and
20 which works in an arcuate slot 42 in the support
28. Screw 4|) is threaded and is provided with a
hand nut 43 bearing on an ear or lug 44 fixed
with support 28. As the hand nut 43,15 turned
the support 30 is moved in the one or the other
25
direction about pivot 29. Support 30 maybe
clamped in any position of its pivotal adjustment
by a nut 45 on the stud 4|, a similar clamp stud
46 and nut 41 being provided at the other side of
the support. The supporting arrangement is such
that universal adjustment is provided between a
cutter being sharpened and a cooperating grind
ing wheel by mechanism having only four suc
cessive pairs of relatively movable bearing sur
faces interposed between said cutter carrying
spindle and said base, and likewise only four suc
cessive pairs of relatively movable bearing sur
faces interposed~ between said grinding wheel
spindle and said base.
The third support 30 is formed in two pieces,
race 64 carried by the support portion 49, and
interposed anti-friction ball elements 66. This
bearing prevents lateral displacement or whip
ping of the rear end of the spindle 6.
A flywheel or inertia member 66 is fixed on
spindle 6 at a point between bearings 60 and 5|
for reasons more particularly pointed out in a
copending application of Joseph B. Armitage,
Serial No. 750,440, tiled October 24, 1934, which
is directed to this feature of the mechanism. A
spindle brake generally denoted by numeral 61
may be used for quickly stopping the spindle.
Brake 61 includes an arcuate member 68"’best
shown in Fig. 2, having a ’pivot 69 supported from
the member 48. A brake band segment 10 is ilxed 15
on member 68 in a position to engage the periph
ery of ñywheel 66. A hand operable button mem
ber 1| is connected to the member 61 by a mem
ber 12 and serves to permit the operator to
engage the brake and quickly stop rotation of 20
spindle 6 when desired, the brake being normally
held disengaged by a spring 13.
The power for rotation of spindle 6 is derived
from a self-contained primary motion motor
which may be of any suitable form or type in 25
cluding a rotor member 14 which is fixed on
spindle 6 at a point between the intermediate
bearing 5| and the rear bearing 52. The motor
stator element 15 is ñxed with the portion 49
of the third support in manner to'be removed to 30
expose the rotor when the portion 49 is removed.
'I'he position and relationship of the motor mem
bers relative to the grinding wheel and spindle
bearings has been found to be of material bene
ñt in improving the action of the grinding wheel, 35
particularly in maintaining a constant speed, and
in reducing vibration or chatter.
What is claimed is:
removably attached motor housing portion or
1. In a cutter grinder, the combination of a
base, a grinding wheel spindle and a cutter spin 40
member 49. The portion 48 carries a front anti
wheel spindle support means including a ñrst
40 there being a main portion or member 48 and a
friction bearing 50 and an intermediate anti
friction bearing 5|. 'I'he portion 49 carries a rear
45 anti-friction bearing 52. 'I'he front bearing 50
includes aninner race 531 shouldered against an
enlarged portion of spindle 6 at 54, an outer race
55 shouldered against the support member 48
at 56, there being a plurality of interposed
50 anti-friction ball elements 51, the bearing being
adapted to restrain both rearward axial and lat
eral movements of the spindle. Theintermediate
bearing 5| includes an inner race 58 which is
slidably fitted to spindle 6, an outer race 59 which
55 is shouldered against support member 48 at 60,
and a plurality of interposed anti-friction ball
elements 6|, this bearing being adapted to re
strain both forward axial and lateral movements
of the spindle. The inner race '58 may be ad
60 justed along spindle 6 by the means of a nut
62 threaded on the spindle and the form of
thevarious races and interposed anti-friction
ball elements of the bearings 5II, 5| is such that
adjustment of nut 62 serves to remove all slack
in both these bearings and thereby to tix Athe
spindle 6 against axial movement in either di
rection and against lateral movement at either
end. A slight further tightening of nut 62 sets
up an initial or preloaded condition of each of'
70 the bearings 50 and 5|', which serves to minimize
die-each rotatably supported from said base, and
support slidably supported from said base for
movement toward and from said cutter spindle,
a second support slidably supported from said 45
base for reciprocatory movement in a path trans
verse to the path of movement of said :ñrst sup
port and a third support pivoted for movement
about a horizontal axis transverse to the axis
of said wheel spindle, said wheel spindle being
journaled in said third support and vadjustable
about said axis to various positions including a
substantially horizontal position, and power
means for driving said wheel spindle including a
primary motion motor device providing a rotor 55
ilxed with said wheel spindleand a stator iixed
with said third support.
`
2. In a cutter grinder for sharpening face
milling cutters, a base, a cutter supporting slide
mounted .on'said base for horizontal linear ad 60
justment, a grinder supporting slide mounted on
said base for horizontal linear adjustment to
wards and from said cutter slide at right angles
to the line of adjustment of said cutter slide, a
cutter carrying bracket pivotally mounted on said 65
cutter _slide for angular adjustment in a hori
zontal-fplane, a cutter spindle support mounted
for vertical linear adjustment on said cutter
carrying bracket, a cutter carrying spindle jour
naled'horizontally in said cutter spindle support, 70
or prevent any displacement of the spindle as the
- means for turning said spindle about its hori
grinding load increases or decreases and to pre
zontally disposed axis to present the~ blades of a '
vent'chatter or vibration of the grinding wheel. cutter carried thereby successively for sharpen
` 'I'he rear- bearing 52.includes an inner race 63
75 in »which the spindle 6 is slidably ñtted, an outer
ing, a grinder supporting bracket mounted on said
grinder slide for lineal traverse at right angles to
2,1 18,967
the direction of adjustment of said grinder slide,y in manner
3
to clamp said grinding unit to said y
'a grinder spindle support pivotally mounted on
supporting element, an adjusting screw pivotally
said grinder supporting bracket for angular ad
justment in a vertical plane, a grinding wheel
spindle journaled for rotation in said grinder
spindle support, a grinding wheel iixed to the end
of said grinder spindle in cooperating relation
ship with said cutter supporting spindle, a iiy
mounted on one of said clamping bolts outside of
wheel iixed on said grinder spindle, a self-con
10 tained driving motor directly connected to said
grinder spindle, said grinder spindle and con
nected grinding wheel ñywheel and driving motor
together with said spindle support being mov
able as a unit in adjusting the position of said
15 grinding wheel and in traversing said wheel in
grinding relation with a cutter supported in said
cutter supporting spindle, the supporting ar
rangement being such that there are four suc
cessive pairs of relatively movable bearing sur
20 faces interposed between said grinder spindle
and said base and likewise four successive pairs of
relatively movable bearing surfaces interposed
between said cutter spindle and said base.
_3. In a cutter grinder forgrinding face milling
25 cutters, the combination with a base and means
on said base to support a cutter with its axis' in
horizontal position and adjustable angularly and
said supporting element, a l'ug on said supporting
element having an opening for receiving said
adjusting screw, and a manually operable. ad
justing nut threaded >on said adjusting screw and
disposed to engage said lug- to adjustably posi
tion said grindingv unit angularly for clamping
by said clamping bolts in predetermined angular
position.
‘
.
5. In a cutter grinder for sharpening face mill
ing cutters, including a base; the combination
with a cutter supporting slide mounted o'n said
base `for horizontal linear adjustment, a cutter 15
carrying bracket pivotally mounted on said cutter
supporting slide for angular adjustment in a hori
Zonta] plane,„a cutter spindle-support mounted
for vertical linear adjustment on said cutter
carrying bracket, and a cutter `carrying spindle 20
journaled horizontally in said cutter spindle sup
port in position to present the blades of a cutter
carried thereby _for sharpening; of a grinder sup
porting slide mounted on said base for horizontal ,
linear adjustment towards and from said cutter 25
carrying spindle in direction at right angles to
the line- of adjustment of said cutter supporting
vertically; of a grinding unit’mounted on said slide, a grinder carrying bracket mounted .on
base including a grinding spindle and a grinding Y said grinder supporting slide for lineal traverse
30 wheel a ñywheel and a driving motor rotor mount
ed on said spindle, a support pivotally carrying
said grinding unit for angular adjustment bodily
in a vertical plane said support including a co
operatingv motor stator, a screw and nut mech
35 anism for positioning said grinding unit angu
larly relative to said support, and clamping means
for retaining said grinding unit in predetermined
angular position.
’
4. In a cutter grinder, a base, means on said
base for holding a cutter in position to be ground,
a grinding unit including a grinding wheel and a
driving motor carried -by said base and operable
to grind a cutter, a supporting element pivotally
supporting said grinding unit on Said base for
45 angular adjustment in a vertical plane said sup
porting element having arcuate slots at each side
thereof, clamping bolts extending from each side
of said grinding unit through said arcuate slots
‘ at right angles to the direction of adjustment of 30
said grinder supporting slide, a grinder spindle
support pivotally mounted on said grinder carry
ing bracket for angular adjustment in a vertical
plane, and a »grinding wheel spindle journaled for
rotation in said grinder spindle support in posi 35
tion to present a grinding wheel f_or cooperating
with- a cutter carried by said cutter carrying
spindle; the supporting arrangement being such
that universal adjustment is provided between a
cutter being sharpened and a cooperating grind
ing wheel by mechanism having only four suc
cessive pairs of relatively movable bearing sur- y
faces interposed betweenv said cutter carrying
spindle and said base and likewise only four suc
cessive pairs ,of relatively movable bearing sur
faces interposed between said grinding wheel
‘_ spindle and said base.
FRANK W. CURTIS.
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