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' Dec. 23, 1947.
, Filed March 8,‘ 1945
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Filed March 8, 1945
13 Sheets-Sheet l0
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13 Sheets—Sheet 13
Patented Dec. 23, 1947
Ralph E. Cross, Grosse Pointe, Mich.
Application March 8, 1945, Serial No. 581,668
6 Claims.
This invention relates to machines for cham
fering the teeth of gears, that is, chamfering the
end edges thereof so as to remove burrs formed
at such edges during machining of the teeth of
the gears or for reducing the width of the ends
of the teeth so as to enable two relatively axially
movable gears to more readily be shifted axially
with respect to each other into inter-meshing
(01. 90--1.4)
reciprocation simultaneously with said reciproca
tory movement thereof.
The above being among the objects of the
present invention, the same consists in certain
novel features of construction and combinations
of parts to be hereinafter described with refer
ence to the accompanying drawings, and then
claimed, having the above and other objects in
Objects of the present invention include the 10
In the accompanying drawings which illustrate
provision of mechanism for chamfering gears by
suitable embodiments of the present invention,
means of which a superior result may be obtained
and one that will be more economical than exist
ing machines in the chamfering of such gears,
and in which like numerals refer to like parts
throughout the several different views,
Fig. l is a side elevational view of a gear cham
particularly in quantity production; the provision 15 fering machine constructed in accordance with
of gear chamfering apparatus that is readily
the present invention;
adapted to the chamfering of the teeth of gears
Fig. 2 is a partially broken plan view of the
of different diameters, different tooth forms, to
machine shown in Fig. 1;
gears regardless of the number of teeth, and to
Fig. 3 is an end elevational view of the machine
a wide variety of types of'gears; the provision 20 shown in the preceding ?gures taken as looking
of apparatus of the type described that is com
at the right hand end thereof as viewed in Figs.
pletely automatic in operation, requiring only the
1 and 2;
loading of the gears thereon and removal of the
Fig. 4 is an enlarged fragmentary view taken
gears therefrom; the provision of apparatus of
looking in the direction of the arrows 4-4 in
the type described including a reciprocable cut 25 Fig. 1, showing the reciprocat-ory slide which car
ting element which is bodily moved simultaneous
ries the cutting element and the cutting elements
1y with its reciprocatory movement in a direction
mounted thereon and more speci?cally in the
transverse to the' direction of reciprocation to
direction of the arrows 4—4 of Fig. 8;
vary its operative relation with respect to the
Fig. 5 is an enlarged, fragmentary,. vertical
tooth of a gear chambered thereby; the provision ‘ 30 sectional view taken on the line 5-5 of Fig. 1
of apparatus of the type described in which such
and illustrating the mounting of the oscillatory
transverse movement is a swinging movement;
cutter carrying head and the drive thereto;
the provision of apparatus of the type described
Fig. 6 is a vertical sectional view through the
in which a second reciprocatory movement of
oscillating cutter carrying head, taken as on the
the cutting element in a path transverse to the 35 line 6-6 of Fig. 8 and illustrating the means
?rst-mentioned reciprocatory movement is pro
employed for e?ecting oscillation of the head;
vided to obtain the desired path of movement
Fig. 7 is an enlarged, horizontal sectional view
of the cutting element; the provision of appa
through the oscillating head taken on the line
ratus of the type described in which the cutting
‘I——'l of Fig. 5 and illustrating the means em
element is so constructed and arranged as to 40 ployed in conjunction with the oscillating head
simultaneously chamber the adjacent edges of
for e?ecting reciprocation of the cutter carrier;
adjacent teeth of a gear; the provision of a con
struction as above described in which the gear
trally through the oscillating head as on the line
is automatically indexed to present consecutive
8-8 of Fig. 7;
Fig. 8 is a vertical sectional view taken cen
teeth to the action of the cutting elements as an 45
Fig. 9 is an enlarged, horizontal sectional view
incident to the remaining operations of the ap
taken through the ?xed portion of the machine
paratus; and the provision of apparatus of the
and on the axis of the work supporting spindle,
type described including means for supporting
a workpiece gear for rotation about its axis, for
particularly bringing out the mechanism em
ployed for intermittently rotating the work sup
intermittently rotating the gear work blank 50 porting spindle;
about its axis, for reciprocating a cutting tool
Fig. 10 is a slightly enlarged, vertical sectional
toward and from the gear work-piece in timed
view through the driving mechanism and. on the
relation with respect to the intermittent rota
line l0—l0 of Fig. 9 and illustrating the connec
tional movements thereof, and for shifting the
tion between the prime mover and the mecha
cutting tool in a direction transverse to said 65 nism driven thereby;
Fig. 11 is an enlarged, fragmentary vertical
sectional view taken on the line lI—-l| of Fig. 9;
Fig. 12 is an enlarged, fragmentary, front ele
vational view of that portion of the machine
shown in Fig. 1 including the dovetail for sup
porting the slide which carries the oscillatory
cutter carrying head and bringing out certain
details thereof employed in conjunction with the
of the cutter Or shaper head for the machine
shown in Fig. 27;
Fig. 29 is a, slightly enlarged, partially broken,
partially sectional view of the cutter or shaper
head shown in Fig. 28 and taken looking from the
lefthand face thereof as viewed in Fig. 28;
Fig. 30 is an enlarged horizontal sectional view
of the shaper or cutter head shown in Fig. 28 on
the line 38—-30 of Fig. 28;
adjustment thereof;
Fig. 31 is an enlarged, fragmentary view taken
Fig. 13 is an enlarged, fragmentary, horizontal 10
on the line 3I-3I of Fig. 30 showing the cam in
sectional view taken on the line l3—l3 of Fig. 12;
end view and in cooperative relationship with re
Fig. 14 is a vertically sectioned view taken on
spect to the switch employed for controlling the
the line Ill-44 of Fig. 15 axially through the
point at which the cam is stopped in its rotation
electrically operated control valve for controlling
the movement of the cutter carrying head away 15 upon the completion of a piece of work; and
Fig. 32 is an enlarged, fragmentary, sectional
from operative position upon the completion of
chamfering of a gear and for returning it to such .
view taken on the line 32—32 of Fig. 31.
The present invention may be brie?y described
as mechanism by means of which a toothed mem
mounted upon the work carrying spindle;
Fig. 15 is a fragmentary, sectional view taken 20 ber, such as a gear, the teeth of which are to be
chamfered, is suitably mounted and intermittent
on the line l‘5+-l5 of Fig. 3 and illustrating the
position when a new gear work blank has been
arrangement of certain oi the control mechanism
ly rotated so as to bring each tooth in turn into
spect to the teeth of. a spur gear which are to be
stant amount of chamfer for the edge of the
tooth. For this reason it is necessary that the
cutting tool have a movement in addition to the
the correct position to be operated upon by the
for the machine;
cutting tool. The cutting tool itself is mounted
Fig. 1,6 is a fragmentary. vertical sectional view
.for reciprocation generally in the plane of the end
taken on the line'l6-.-.-l6 of Fig. 15;
of the tooth to be chamfered. In view of the fact
Fig. 17 is a diagrammaticview illustrating the
the edge of a tooth to be chamfered is not
control mechanism for positioning the cutter car
ordinarily a straight line but is curved, it will
rying head in operative and inoperative position;
be appreciated that reciprocatory movement alone
Fig. 18 is a fragmentary, perspective view illus
trating the relation of the cutting tool with re 30 is not su?icient in such case to provide a con
chamfered thereby by the use of the machine
shown in the preceding figure;
Fig. 19 is a fragmentary, perspective view of the
gear shown in Fig. 18, together with the cutter
shown in dot-and-dash lines, illustrating the form
of chamfer imparted to the teeth of the gear
reciprocatory movement thereof and in accord
ance with the present invention this is accom
plished by shifting the cutting element during
such reciprocation in a direction transverse to
the line of such reciprocation. Such shifting of
the cutting tool may be accomplished in any suit~
Fig. 20 is a fragmentary, diagrammatic view il
able manner. For instance, it may be accom
lustrating the relationship existing between the 40 plished by swinging the cutting element, during its
cutter and the teeth of the gear at the initiation
reciprocatory movement, about a pivotal aXis in
of a chamfering of the former on the latter;
such a manner that the cutting element may
Fig. 21 is a View similar to Fig. 20 but illustrat
have a constant depth of cut with respect to the
ing the relation of the parts at an intermediate 45 edge of the tooth being chamfered. On the other
point in the cutting operation;
hand, it may have a second reciprocatory move
Fig. 22 is a view similar to Figs. 20 and 21 but
ment imparted to it to effect the same ultimate
illustrating the relation of the parts at the com
result. The mechanism is such that the move
pletion of a cutting operation and at the moment
ment of the tool may be varied to accommodate
the cutting element is about to begin its return 50 it to any tooth edge curvature that a piece of
Fig. 23 is a fragmentary, more or less diagram
matic view illustrating the path of movement of
the cutting element with respect to the axially
work may have and in fact it may be adjusted to
chamfer the edges of straight sided teeth if nec
The mechanism of the present invention is,
outer ends of the teeth of a beveled gear during 55 furthermore, adapted to the chamfering of sub
stantially all types of gears whether these be
a chamfering operation on the same in accord
spur, ring, bevel, or internal gears and whether
ance with the present invention;
they be of the spiral or straight tooth type. Fur
Fig. 24 is a view illustrating therelative posi
thermore, it is adapted to the chamfering of the
tion and relative movement of the parts where
the apparatus of the present invention is em 60 ends of splines which may be formed either ex
ternally of a piece of work or within the bore
ployed for chamfering the inner ends of the teeth
of a beveled gear;
While the mechanism of the present inven
Fig. 25 is a fragmentary, more or lessdiagram
tion may be constructed to chamfer one edge of
matic view illustrating the application of the pres
ent invention to the chamfering of the inner ends 6,5 one tooth of a gear at a time, it will be ap
preciated that in the interests of high produc
tivity it is preferable to chamfer two edges si
Fig. 26 is a fragmentary,v more or less diagram
multaneously and in the preferred embodiments
matic view illustrating the application of the
of the teeth of an internal gear;
of the invention shown in the drawings by way of
present invention to the chamfering of the outer
end of the splines of an internally splined mem 70 illustration the arrangement is such that during
each reciprocatory movement of the cutter it si
multaneously chamfers the adjacent edges of two
Fig. 27 isa view somewhat similar to Fig. 1 but
adjacent teeth. By the same token it may, as
illustrating a modi?ed form of construction;
will be appreciated, be designed for use, as by
Fig. 28 is an enlarged, fragmentary, partially
broken, partially sectioned, side elevational view 75 the use of adifferently formed cutting element, to
chamfer both edges of the same tooth, but the
former method is shown in the drawings by way
of illustration.
The reciprocatory movements of the cutter are,
of course, effected in timed relation with respect.
to the indexing mechanism for intermittently
turning the workpiece and this indexing mecha
mechanisms operate in timed relation with re
spect to each other.
Now, referring to Fig. 5, which is a fragmentary,
vertical sectional view taken transversely of the
machine on the line 5-5 of Fig. 1 and particu
larly through the cutter head 42 thereof and the.
driving mechanism therefor where employing the
nism is so constructed and arranged as to permit
swinging type of cutter or shaper head as brought
its adjustment to accommodate a single machine
out in Figs. 1 to 8, inclusive, it will be noted that
to the chamfering of gears having different num 10 the slide 36 is hollow and is provided therein with
bers of teeth and, of course, the machine is ad
a transverse shaft 44 bridging the opposite side
justable additionally to provide for the chamfer
walls thereof and supported in such walls by the
ing of gears having relatively widely different di
anti-friction bearings 45 and 48, respectively.
The slide 4!] which is mounted thereon has ?xed
The mechanism or machine of the present in 15 to its lower face a housing 59 which projects down
vention is essentially a high production machine
through a slot 52 in the upper wall of the slide
and in carrying out'this function means are pref
\ 36. Rotatably but relatively ?xed against axial
erably provided whereby upon completion of the
movement in the housing 56 in concentric relation
chamfering operations on one face of the gear
with respect to the shaft 44 is a sleeve member 54
the machine is automatically stopped and the 20 which is splined to the shaft 44 for equal rotation
work is exposed for ready removal and replace
ment by an unmachined part or face. Thus once
the machine is set up for production all that may
be necessary for a workman to do is to apply and
therewith but is free to move axially with re
spect thereto. The sleeve member 54 has ?xed
to it within the housing 50 a bevel gear 56.
The cutter or shaper head 42 includes a base
remove the work from the machine and simply 25 58 received in flat contacting relationship with
respect to the upper face of the slide 40 and it is
provided with a depending central sleeve 6|] which
Reference has heretofore been made regarding
is received in piloted relationship with respect to
the obtaining of a constant depth of cut of the
cutter with respect to the work during the cham 30. a complementary opening formed vertically
through the slide 42. It is also provided with an
fering operation. While ordinarily it will be ap
integral upwardly projecting sleeve 62 concentric
preciated that this will be preferable, there may
with the sleeve 60 and within these sleeves is
be instances where it may be desired to vary the
mounted a vertically directed shaft 64. A hearing
amount of chamfer over the length of a tooth
and this may be readily accomplished by the use 35 66 is provided between the shaft 64 and the upper
end of the sleeve 62 and a similar bearing 68
of the present invention as will hereinafter be
between the shaft 64 and the lower end of the
more fully appreciated from the description
sleeve 60. The lower end of the shaft 64 projects
within the housing 50 where it is provided with a
Now, referring to the accompanying drawings
and particularly to Figs. 1, 2 and 3 it will be seen 40 bevel gear 10 in meshing relationship with respect
to the bevel gear 56. The base 58 is clamped to
that the machine in question comprises a hollow
the slide 40 by bolts ‘H (best shown in Figs. 1 and
cast metal base 3t upon one end of which is ?xed
press a button after work has been applied there»
to in order to set the machine in operation.
what may be termed a work head indicated gen
12) the heads of which are received in a circular
erally at 32 and in which is mounted the mech
T-s‘lot ‘Ha (Fig. 5) formed in the upper face of
anism for supporting the workpiece and driving 45 the slide 40. By this means the base and, there
it in the desired intermittent motion. The work
fore, the cutter or shaper head 42 may be adjusted
head 32 may also contain the driving motor as
to any desired normal position on the slide 40
will hereinafter be more speci?cally brought out.
about the axis of the sleeve 60.
As best brought out inFigs. 2 and 3 at the end of
A ring member 12 is ?xed to the upper face of
the base an opposite the work head 32, the base 50 the base 58 by screws or bolts 13 and is provided
30 on its upper surface is provided with horizon
with a ?at upper surface normal to the axis of
tally arranged ways 34 extending longitudinally of
the shaft 64 and seated upon such upper surface
the base 30, that is to right and left as viewed
is the housing proper 14 of the cutter head 42.
in Fig. 2. Upon the ways 34 is received a slide
The housing 14 concentrically with the shaft 64
36 and which, therefore, is movable toward and 55 and sleeve 62 has ?xed to its lower face a depend
ing bearingrringrr'lli between which and the pe
formed, on its upper face with a horizontal dove
riphery of the sleeve 62 are mounted suitable anti
tail 38 extending transversely to the length of the
friction bearing assemblies 78 which mount the
ways 34 and a slide 40 is mounted on the dove
tail 38. Conventional manually rotatable screw 60 housing 14 for rotation about the axis of the
shaft 64. A ring 80 of sheet brass or other suit
means 39 cooperate between the slide 36 and the
able anti-friction material may be interposed be
slide 40 to permit the position of the slide 40 to be
tween the matching faces of the ring member 12
adjusted on the dovetail 38. A detailed showing
and the housing 14 as shown, and preferably a
of such screw means is not given inasmuch as it
is of a conventional type well recognized by those 65 ring 82 of felt or the like is also interposed be
tween such surfaces to prevent the entrance of
skilled in the machine tool art. The slide 40 in
dust or other foreign material to the bearings
turn supports the cutter or shaper head indicated
18. It will be noted that a nut 84 threaded on the
generally at 42. In the particular construction
upper end of the sleeve 62 cooperates through the
shown in Figs. 1 to 8, inclusive, the cutter head 42
includes means for supporting and reciprocating a, 70 inner race of the upper bearing 18 to limit axial
cutting tool and for causing a pivotal movement
play between the housing 14 and the sleeve 62 and,
of the cutting tool during the reciprocation where
therefore, with respect to the slide 40 and that
necessary and as previously described. This
the housing 14 is thus mounted for rotational
mechanism is suitably connected with the index
movement on the slide 40 about the axis of the
ing mechanism in the work head 32 so that both‘ 75 shaft '64. It will also be noted that the shaft 64
from the work head 32. The slide 36 in turn is
has ?xed to its upper end within the housing 14
a, bevel gear 86.
Referring now to Figs. 7 and 8 it will be noted
that the cutter or shaper head housing ‘I4 is
provided with a pair of transverse walls 88 and
corresponding end of the housing 14 and such end
is open but is closed by a removable cap or cover
I30, thus forming a chamber I32 between the
wa1l00 and the cover I30. The shaft 96 projects
into the chamber I32 and is there provided with
spectively. These bearings rotatably support the
a peripheral type of cam I34 ?xed to it. II’he
bottom wall of the'housing ‘I4 below the cam I34
is cut away so as to expose the upper face of the
mesh with the gear 66. Outwardly of the wall 88
upwardly projecting standard or bracket I36, the
90 which are centrally apertured .to receive the
anti-friction bearing assemblies 92 and 94, re
member 12 and ?xed to the upper face of the
horizontal shaft 96 which has ?xed thereto be
tween the bearings a bevel gear 68 which lies in 10 member ‘I2 within such cut-away portion is an
upper-end of which is bifurcated and receives
the housing ‘I4 is formed to provide a pocket or
therein in horizontal alignment with the center
chamber I60 which is bounded at its outer end in
of the cam I34 a roller I38, best shown in Fig. 6,
a ?at face I02 formed on the corresponding end
of the housing ‘I4. Against the ?at face I02 a 16 rotatably supported upon the pin I40. A coil
spring I42 maintained under tension between the
tool slideI64 is received. The upper and lower
bracket I36 and an anchor member I44 mounted
edges of the tool slide I04 are beveled as best
in the wall of the housing ‘I4 on that side of the
shown in Fig. 8 and are complementarily received
shaft 96 opposite the bracket I36 constantly urges
by way strips I06 and I08 secured to the corre
sponding end of the housing ‘I4. These way strips 20 the housing '14 to rotate about the axis of the
shaft 64 in a direction to constantly and resilient
cooperate with the flat face I02 of the housing
1y. press the cam I34 against the roller I38. The
‘I4 to provide a dovetail for receiving the slide I04
contour of the cam I34 is such in any case, and
and guiding it for reciprocatory movement in a
depending upon the curvature of the tooth edge
horizontal direction.
Reciprocation is imparted to the slide I04 in the 25 to be chamfered, that as the shaft 96 is rotated
to cause reciprocation of the cutter slide I04 it
following manner. The end of the shaft 96 pro
simultaneously rotates the cam I34 and through
jecting through the wall 88 is provided with an
the cam I34 the housing 14 is caused to oscillate
enlarged head H0 to which is ?xed and from
about the axis of the shaft 64 so as to cause the
which projects a pin H2 arranged with its axis
cutter I20, in the particular case shown, to move
in parallel but eccentric relation with respect to
along a curved path. It will be appreciated that
the axis of the shaft 96. Reference also to Fig. 4
the curvature of this path is controlled by the
will aid in the understanding of this part of the
contour of the cam I34 and the contour of the
structure. An inwardly projecting pin'l I4 is ?xed
cam I34 is such as to control the curvature of
to the slide I04 and projects to within the cham
the path of movement of the cutting edges of
ber I00. A short link H6 is pivotally connected
the tool I20 to effect the desired depth of cut of
at its opposite ends to the pins I I2 and I I4, respec
the cutting element I20 on the edges of the teeth
tively. It will thus be appreciated that as the
being machined thereby.
shaft 96 rotates the pin H2 is caused to move in
It will thus be appreciated that rotation of the
a rotary path and being connected by the link
40 shaft 44 causes rotation of the shaft 64 and,
II6 to the pin II4 which is ?xed to the tool slide
accordingly, the shaft 96, and rotation of the
I04, the tool slide I04 is caused to reciprocate in
latter acting through the eccentric pin I I2 recip
conformance therewith.
rocation of the tool slide I04, and through the
While in the broader aspects of the invention
cam I34 oscillation of the housing ‘I4 in timed
it will be appreciated that the cutting tool may
relation to the reciprocatory movements of the
be mounted on the cutter slide I64 in any suitable
tool slide I04. The cutter head 42 being mounted
or conventional manner, in the particular con
upon the slide 40 and because of the spline con
struction illustrated a plate member -I I8 is suit
nection between the shaft 44 and the sleeve 54,
ably bolted to the outer face of the'tool slide I04.
‘may be moved to any position transversely of the
The cutting tool or cutter is illustrated at I20
Width of the slide 36 to accommodate any size
and as being ?xed to the plate I I6 by means of a
of gear within the capacity of the machine. In
clamping member I22 and clamp screw'I24, the
cidentally it may be noted at this point that the
tool in such case projecting beyond the right
inner, or righthand end of the shaft 44 as viewed
hand end of the tool slide I04 as brought out in
in Fig. 5 has ?xed thereto a bevel gear I46
Fig. 4. For permitting a fine control of. the axial 55 through which movement is imparted thereto in
position of the cutter blade I 20 -a screw I26
threaded through a lug I28 integral with the
plate H8 is arranged in parallel relation with
respect to the path of movement of the tool I20
between the clamp I22 and the plate H8 and in
a manner which will hereinafter be described.
‘The construction of the work head 32 is
brought out in Figs. 9, 10 and 11. As there indi
cated it comprises a hollow housing or casing I50
within which a main drive shaft I52 is suitably
abutting relationship with respect to the inner
supported by bearings I54 and I56. One end of
end of the cutter I20.
the shaft I52 projects out through the back face
of the housing I50 where it is supported in the
From the description .thus far given it will be
appreciated that the mechanism provided in
bearing I54 by means of the plate or closure I58
cludes means for mounting the cutter I20 for 65 closing the opening I60 in the housing to permit
the introduction of the shaft I52 with the gears
reciprocatory movement on the cutter or shaper
hereinafter described assembled thereto. The
head 42 in a horizontal direction and in a
outwardly projecting end of the shaft I52 is pro
straight line movement with respect thereto.
vided with a bevel gear I62 ?xed thereto.
The following mechanism is provided in the con
The drive shaft I52 may be driven in any suita
struction thereof shown in Figs. 1 to 8 for simul
ble or conventional manner but in the preferred
taneously imparting a movement to the cutter
embodiment of the invention it is provided with
blade which will cause it to follow a curved path,
a worm gear I64 ?xed to it between the bearings
this being required for the reasons heretofore
I54 and I56. The worm gear I64 meshes with a
given. It will be noted in Figs. '7 and 8 that the
transverse wall 90 is spaced inwardly from the 75 worm wheel I66 which, as best brought out in
Fig. 10, is formed integrally with a vertical shaft
gear 224‘ in‘ the same vertical plane as'the gear
2I8." Between the shafts-2 I0 and 222'is a stub
I 58 rotatably supported at its lower end by a bear
ing assembly I'I0 supported by a bracket I'I2
formed integrally with a vertical wall I14 prefera
shaft 226 mounted in a conventional manner, as
in a‘shiftable slotted member 221, for shiftable
bly formed integrally with the housing I50. The
movement between the shafts 2I0 and 222,.“and
wall H4 is connected at its upper end to a short
the stub shaft 226 rotatably supports an idler
transverse wall I16 which supports a bearing as
gear‘ 228. which lies in mesh with both the gears
sembly Ila in which the upper end of the shaft
2I8 and 224 and, therefore, serves to provide a
I 68 is rotatably supported. Above the wall I16
driving connection between them. The connec;
the shaft has ?xed thereto a sheave I18 which 10 tion between the shafts 2I0 and 222 is, there
is connected by a belt I80 with a sheave or pulley
fore,‘ similarto the feed gearing conventionally
I 82 ?xed to the shaft I84 of an electric motor
employed on lathes between the spindle and the
I85 disposed within the housing I50 and suitably
feed screw‘ and is not believed to require a de
supported therein.
tailed showing and description of the same for
Now referring to Fig. 9 it will be noted that the
that reason. However, it will be appreciated that
bearing I56 is supported in an inwardly project
this gearing, similar to such feed gearingv of a
ing ?ange or bracket I90 formed integrally with
lathe, permits substitution of the various gears
the adjacent wall of the housing I50. The shaft
so as to permit any desired driving ratio to be
I52 at this point is enlarged and has formed in
established between the shafts 2I0 and 222; .
tegrally therewith a bevel gear I92. The bevel "20
To the left of the'shaft 222 as viewed in‘lFig.
gear I 92 lies in mesh with a bevel gear I94 which
9 and parallel therewith is the work spindle 230
is ?xed to a shaft I55 suitably supported for ro
which comprises a relatively large and heavy
tation in bearing assemblies I98 mountedin the
shaft rotatably' supported in one side wall of
corresponding wall of the housing I50. The outer
the housing I50 by‘ a bearing assembly 232- and
end of the shaft I06 carries the constantly r0 .25 in the‘ intermediate wall 234 formed integrally
tating member of any suitable or conventional in
with the housing I50 by‘ the-bearing assembly
termittent motion mechanism and which may, for
230. ‘ Fixed to the'spindle 230 between the bear
instance, be of the conventional Geneva motion
ings 232 and 236 is a relatively large spur gear
type and is so shown. In other words, the outer
230. ‘The gear 238 lies in mesh with a gear 240
end of the shaft I06 has ?xed thereto a disc 200
‘?xed‘to the inner end of the shaft 222. Thus
from which projects a forwardly extending pin
the spindle 230 is drivingly connected to the in—
2532 which is adapted to consecutively engage the
termitten'tly rotatable shaft 2 I 0.
> '
pockets 204 in the circular member 208 mounted
The‘outer end of the spindle 230 is enlarged
substantially directly below the shaft I95. The
as 213‘242‘ and projects out through the cover
member 28 is ?xed to one end of a shaft 2 I0 ex
member 2E4 which‘ is sealed with respect thereto
by suitable packing means 244. At its inner end
the large portion 242 is provided with a peripheral
?ange 246. Fixed to the enlarged end'242 with
in the chamber 2I0 and against the ?ange'246
tending between opposite side walls of the hous
ing 252 in perpendicular relationship with respect
to the axis of the drive shaft I52 as viewed in
Fig. 9 and is provided with suitable hearings in
such opposite side walls as will be appreciated. It
will thus be understood that as the shafts I52
and I95 rotate at a uniform angular speed the in
ter-engagement of the pin 202 of the constantly
rotating member 20 in consecutively engaging
is a relatively large wheel or disc 248 having
an axially directed annular ?ange 250 in which
a plurality of‘ pins 252 are secured and from
which‘lthe pins project axially inwardly‘beyond
the pockets 254 of the member 208 will impart a ' '
the inner edge of the‘flange 250. The pins 252
are equally angularly spaced with respect to each
step-by-step movement of the member 208 and,
therefore, to the shaft 2I0, the character of the
intermittent motion thus applied to the shaft 2 I0,
and it will be understood that there are as many
pins 252 as there ‘are teeth on the gear to be
that is the angular extent of each step of angu
chamfered, ‘shown as the gear 254._ The pins
other about the axis of the wheel or disc 248
lar movement of the member 2| 0, being deter- ‘
252 serve as a part of the mechanism for look
mined by the number of pockets 204 in the mem
ing the spindle 230 and, therefore,‘ the gear 254
to be chamfered and carried thereby for a cham
ber 208.
It may be noted and as brought out in‘Fig.
9 that that side face of the housing -I5 through
which the shaft I96 projects is provided with. an
outstanding ?ange or ledge 2I2 which projects
outwardly beyond the outer face of the member
208 and normally receives thereon a cover mem
ber 2i 4 which cooperates therewith to form a
chamber 2N5 between it and the corresponding
side wall of the housing I50 in which the members
200 and 208 are enclosed and which also serves
as an enclosure for other parts which will herein
after be described.
The Shaft m projects out through the wall or
the housing I50 opposite to the wall just re
ferred to and on such projecting end has, secured
thereto for equal rotation therewith a spur gear
298, preferably through some conventional form
of mechanism such as indicated at 225 which
will permit its position angularly of the shaft
2I0 to be readily varied. Another shaft 222 ‘is
suitably supported by the housing I5 in parallel
and spaced relation with respect to the shaft
2! 0 and has non-rotatably secured thereto a spur
fering operation in each successive position of
rotation thereof required to bring the successive
teeth of the'g‘ear 254 into cooperative relation-,
ship with respect ‘to the cutter I20 on the cutter
‘or shaper head required for the chamfering oper
To utilize the pins 252 as a means for positively
at locking'the spindle 230 in each of its angularly
shifted positions the following mechanism is pro
vided. At the inner end of the shaft I52 a rod
or shaft 254 is mounted for reciprocatory ‘move
ment in a direction parallel with the‘axis of the
spindle 230 and in line wlth‘that circle of the
flange 250 of the wheel or disc 248 on whichthe
axes of the various pins 252 ‘are located. The
inner end of the shaft 254‘ is supported in a bear
ing 255 carried by an extension 258 of the bracket
I90, and its outer end is reciprocably mounted in
a removable bushing 200 projected through the
corresponding side wall of the housing I50. In
termediate its ends the shaft 254 is enlarged as
at 202 and is provided with a transverse slot 264
therein. A pin 265 is ?xed in the enlarged inner
2,688,201 '
end of the shaft I52 in eccentric relation with
respect to the axis thereof 'andprojects axially
outwardlyv beyond such end where it receives
thereon a roller 268 which is relatively closely
has'?xed to it axially outwardly of the worm wheel
I64’ a spur gear 394'. The spur gear 304 lies in
mesli'with a pinion 38% mounted on a shaft 308
rotatably supported in the boss 3 I 0 formed on the
upper inner face of the closure or cover I58 in
received in the slot 264 of the shaft 254. It will
which the outer end of the drive shaft I52 is ro
thus be appreciated that ‘as the shaft I52 rotates
tatably supported. The outer end of the shaft
the connection between it and the shaft 254 will
308 projects into a pocket formed in the outer face
cause the shaft 254 to reciprocate.
of‘the closure I58 and which pocket is in turn
The outer end of the shaft 254 is bored out as
indicated at 210 to a diameter to relatively closely 10 closed by a removable cover 3l2, forming a pump
ing chamber 314. An impeller 3H5 is ?xed to the
receive a pin 252 therein and the length of the
shaft 308 within the chamber 3H5 and cooperates
shaft or rod 254 is such that when the shaft 254
with the Walls of the pump chamber 3H5 to pro
is at the outer limit of its reciprocatory movement
vide a ?uid pressure pump. The inlet side of the
its outer end projects into close but preferably
slightly spaced relation with respect to the rim 15 pump thus formed is connected to a suitable lubri
cant reservoir (not shown) and which, for in2500f the wheel'or‘ disc 248. The relative posi
stance; may be located either in the lower portion
tionof the pins‘252 onthe wheel or disc 248 are
of the housing I50 or in the base 30. The dis
such that they are brought, one after the other,
charge side of the pump thus formed is connected
into‘ alignment'with the shaft 254 each time the
Geneva‘ movement member 208 hesitates in its 20 by suitable ducts (not shown) with the various
wearing‘surfaces of the movable parts in the work
rotary movement, at which time the shaft 254
moves outwardly in its reciprocable movement so
A separate oiling system for the cutter or shape!‘
as to embrace the particular pin 252 then aligned
head 42 and its associated mechanism is also pro
‘therewith and thus to positively lock the spindle
230 in a predetermined‘ angular position and 25 vided. This is accomplished, as best brought out
in Figs. 5 and 13, by‘ projecting the end of the
against rotation during a'material portion ‘of each
shaft 44 outwardly beyond the forward face of the
complete rotation of the shaft 452, this being in
slide 36 Where it is enclosed by a housing member
timed relation to the reciprocatory and the swing
320 removably secured to such face. Within the
ing movements of the cutter blade I20 required to
effect the chamfering operation on the gear teeth 30 housing member 328 the shaft 54 has ?xed thereto
a cam 322. The housing 320 has formed therein
then positioned for engagement therewith. It
a'bore 32-4, forming a cylinder and arranged with
will be appreciated that in the broader aspects
its axis in perpendicular and intersecting rela
of the invention the mechanism justdescri-bed is
tionship with respect to the axis of the shaft M.
indicative of'any suitable mechanism‘ for posi
tively locating and locking the spindle and-the 35 Reciprocably received in the bore 324 is a piston
work-carried thereby successively in predeter~
mined angular positions required to position the
member 326 which is constantly urged into en»
gagement with the cam 322 by means of a coil
spring 3-28 held under compression between the
successive teeth of the gear carried thereby for
piston 32B and a plug 335 threaded into the outer
proper cooperation with the chamfering mech
40 end'of the bore 324. Suitable check valve con
trolled inlet and outlet ports (not shown) open
It will be appreciated that any suitable'means
ing onto the bore 324 between the piston 325 and
may be provided for mounting the gear 254 or
the plug 330 connect, respectively, with a suitable
other workpiece upon the outer end of the spindle
source of lubricant and with passages leading to
230 but in order to explain the structure shown
in the‘drawing employed for this purpose it may 45 the various wearing surfaces of the mechanism
within and supported by the slide 33. Such pas
be noted that a ?uid cylinder, which may be either ’
sages are, for instance, illustrated as the bores
an air or hydraulic cylinder and piston assembly
332 and 334 in Fig. 5, the bores 336 and 338 in
such as 280,-best shown in Fig. 9, but which is
Fig. 7, and the bore 34-0 in Fig. 8, and others.
herein considered as being of the hydraulic type,
In order to drive the mechanism associated with
is mounted on the rear end of the spindle 230 50
the cutter or shaper head 42 from and in timed
co-axially» therewith. The piston rod282 of the
relation with respect to the mechanism within the
cylinder assembly 285 has ?xedto it a rod 234
work head 32 the following mechanism is provided.
which projects through the hollow spindle 238 and
As best brought out in Fig. 2 a housing 350 is ro
beyond the forward end thereof where’ it is. pro~
vided with a head 286. In operation the gear 254 55 tatably mounted upon the outer end of the shaft
I52 about the bevel gear I62 secured thereto.
is slipped over the head 286 and into engagement
Likewise a housing 352 is rotatably mounted upon
with suitable locating means on the forwardend
the outer end of the shaft 44 and about the bevel
of the spindle 233, a U-washer 288 is slipped over
gear 146 thereon. A shaft 35d arranged with its
the'rod 284 under the head 286 and against‘ the
forward face of the gear 254, and thenthe assem 60 axis perpendicular to the axes of the shafts (ill and
152 is rotatably mounted in the housing 35!! and
bly 280 is operated to retract the piston therein
suitably maintained against axial movement with
and'thus to clamp the gearv 254against the end
respect thereto, and ?xed to the shaft 355 within
of the spindle 230. The control for the cylinder
the housing 350 is a bevel gear 356 in meshing
280 may be disposed at any suitable position for
the convenience of the operator of the'machine, 65 relationship with respect to the gear I62.
The housing 352 rotatably supports a bevel
and is illustrated as comprising a foot operated
gear 358 therein and holds it against axial move
pedal 288 in Figs. 1 and .16..
ment. The exterior of the shaft 352 is splined as
As illustrated in the latter ?gure'the pedal is
indicated at 350 and the bore of the gear 358 is
pivoted to the base 30 at 290 and operates a valve
252 through a rod 294 and lever 296, the valve 292 70 complementarily splined for reception thereof so
‘being connected to the cylinder 2B'0through tubes
298 and 300 as shown in Fig. 15.. The source of
as to be relatively non-rotatable but axially slid
able with respect thereto. The gear 358 lies, of
course, in meshing relationship with respect to
liquid under pressure is connected to the valve
the bevel gear I46 so that rotation of the drive
292‘ by means of the tube 302. It will also be
noted in Figs. 9 and II that the drive shaft 152 76 shaft I52 in the work head causes simultaneous
rotation of the shaft 44 through which the drive
to the cutter or shaper head is imparted.
‘of the last two procedures are preferable in the
interests of greater production.
With the above explanation in mind it will be
noted that in such case the cutting element I20
The ratio of the gearing between these two
last-mentioned heads is such that one complete
cycle of operation, that is a complete reciproca
tion of the cutter slide 304 and the cutter blade
is of a truncated V section so as to provide at one
end thereof cutting edges 31!]. The cutting ele
I20 carried thereby, in both directions, will be
ment I20 is mounted with its broad face or base
in flat contacting relationship with respect to the
through the increment of angular movement
plate. member H8 on the tool slide I54 and with
thereof determined by the Geneva drive mecha 10 its center line in a horizontal plane including the
nism therefor, so as to permit a machining opera
axis of the spindle 230 and, therefore, of the gear
tion to be carried out on each tooth of the gear
254 to be operated upon, and the gear 254 is so
54 in turn as it is brought into operative relation
angularly related with respect to the spindle 230
ship with respect to the cutter blade i251. Regu
that in its at rest position two adjacent teeth,
lation of the reciprocato-ry movement of the cut 15 or at least the ends of two adjacent teeth which
ter blade I20 so as to be of proper phase with the
are to be chamfered are located equidistant on
positioning of the teeth of the gear 254 may be
either side of said plane. Preferably, although
eifected each time the spindle ‘3.250 is moved
accomplished in any suitable manner, such as by
not necessarily, as best brought out in Fig. 20
shifting the position of the member 225 with re
spect to the gear 2“) on the shaft 2I0 as previ
which illustrates the position of the cutter or
20 shaper head shortly after it has started on a cut
ously explained.
ting stroke and about the time the cutting ele
Preferably the splined shaft 354 and the gears
ment begins to engage the cooperating teeth of
I62 and 356 and the gears I46 and 358 are pro
the gear 254, the plane of reciprocation of the tool
tected against dust, dirt or the like and to this
slide I04 is approximately parallel to the plane in
end the housing 352 is provided with a cylindri 25 cluding the edges of the two teeth which are
cal extension 362 within which the free end of
about to be chamfered. ‘Where these teeth are
the shaft 354 may project and within which it
the teeth of a spur gear as illustrated in Figs. 18
is housed when so projected. Between the hous~
to 22, inclusive, such plane is the plane of one
ings 350 and 352 is a housing 354 formed of rela
axial face of the gear. Also, when it is a spur type
tively telescoping parts sealed to the housings 30 of gear whose teeth are to be chamfered, the slide
350 and 352 and surrounding the shaft 354 there
36 is positioned on the ways 34 so as to effect
between. The telescoping sections permit exten
initial contact between the cutting element I20
sion and contraction of the housing 364 between
and the cooperating teeth of the gear 254, near
the housings 550 and 352 during shifting of the
the back or widest face of the cutting element
slide 36 longitudinally of the ways 34 as will be 35 I20, that is, at a point in the thickness of the cut
appreciated, and the splined connections between
ting element I20 where the cutting edges 310 are
the shaft 354 and the gear 358 maintains the op
more widely spaced from one another and as
erative driving relationship between these parts
brought out in Fig. 18, as well as in Fig. 20.
during such shifting movement.
> It will be appreciated that if the cutting ele
With the above described mechanism in mind 40 ment I20 was permitted to continue its recipro
it will be appreciated that the work or gear 254
catory movement in its initially positioned direc
is intermittently rotated to bring each tooth
tion the cutting element I20 would simply gouge
thereof into a predetermined position to be op
or remove an ever increasing amount of metal
erated upon by the cutting element I20 and each
from the teeth of the gear as its reciprocation in
time the gear 254 comes to rest after each inter 45 an operativev or cutting direction proceeded,
mittent rotary motion the tool slide I04 carry
whereas it is assumed and as will ordinarily be
ing the plate H8 and cutting element I20 will be
reciprocated to bring the cutting element into
the case, that a constant depth or cross-sectional
area of metal is desired to be removed along sub
stantially the full depth of each tooth to provide
a constant width of chamfered surface. It is,
multaneously rotated to cause the cutting edges
therefore, necessary to withdraw the end of the
of the cutting element I20 to move in a curved
cutting element I20 axially away from the gear
path the shape of which is so controlled as to
254 as the cutting element moves inwardly of the
remove the desired amount of metal from the
teeth towards the axis of the gear in order to
outer corners of each tooth thus engaged by the 55 bring those portions of the cutting edges more
cutting element. - The relative movement between
closely spaced from one another into effective cut
the cutting element and the gear teeth is best
ting position, and at a rate of movement com
brought out in sheet 9 of the drawings, namely
mensurate with the cross-sectional contour of the
in Figs. 18, 19, 20, 21 and 22 shown thereon and
space between the teeth of the work gear. In
engagement with at least one tooth of the gear
254 and the cutter or shaper head 42 will be si
at least in some of which the relation of the 60 the particular case so far described and as spe
parts are shown in more or less diagrammatic
ci?cally illustrated in Figs. 1 to 8, inclusive, this
manner to facilitate the description thereof and
to make it more easily understood.
Now as previously mentioned and as will be
appreciated by those skilled in the art the rela 65
tion of the parts, the shape of the cutting edges
of the cutting element, and the control of the
path of movement of the cutting edges of the
cutting elements with respect to the teeth of the
gear may be such that one edge of one tooth
only may be operated upon at one time, the op
posite edges at one'end of one tooth may be si
multaneously chamfered or, and as shown by way
withdrawal movement of the operative end of the
cutting element I20 is effected by pivoting the
cutter or shaper head 42 about the axis of the
shaft 64 through the medium of the cam I34 act
ing through the roller I38 on the bracket I36.
Thus the cutting element I22 as it moves inwardly
towards the axis of the gear 254 is moved axially
away from the gear 254 so that, and as brought
70 out in Fig. 19, a constant amount of metal is re
moved from the edges of the two engaged teeth
of the gear 54 to provide a constant amount of
chamfer, illustrated in Fig. 19 as at 372, on each
of illustration, the adjacent edges of adjacent
such edge.
teeth may be simultaneously chamfered. Either 75
The cross-sectional contour of the cutting ele
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