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-Al?g. 2% 1946. I
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A_.FOR$TER
,
2,40%,609
MACHINE FOR CUTTING CURVED SELFCONJUGATE‘ INDENTATIONS
Filed Aug. 23, 1940
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A. FORSTER
2,405,009
MACHINE FOR- CUTTING CURVED SELFCQNJUGATE INDENTA‘IYIONS
Filed Aug. 23, 1940
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' Inventor;
Patented Aug. 20, 1946
2,406,009
UNITED STATES PATENT OFFICE
MACHINE FOR CUTTING CURVED, SELF
» CONJUGATE INDENTATIONS
Albert Forster, Milanino, Italy, assigynor to .Buhler
Brothers, Uzwil, Switzerland, a corporation of
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Switzerland
‘ Application August 23, 1940, Serial No.
~ In Switzerland August 24, 1939
16 Claims.
(Cl. 90-5)
1
.
2
The present invention relates to a machine for
displaced with regard to one another by a given
distance in the direction of the axis of rotation
cutting curved, selfconjugate indentations by
continuous rolling.
353,966
Hereinafter there will be
of the blank. The speeds of translation 11 and 112
may have any value, but the quickest cutting of
able to mesh with congruous identations and the 5 an indentation is obtained, under same. circum
teeth will be called “curved” when their axes, ly
stances, when 12 and w are equally great, but
ing on the pitch surface, have a longitudinal curv
have the opposite sign (w=—v). The ratio be
ature. In an indentation one will consider the
tween the speeds of rotation of the milling heads
number of teeth z and the pitch. t and with re
is, in this case:
gard to the milling heads cutting the concave or 10
i_>§§iv_§z_—_w V
» called “selfconjugate” such identations which are
convex faces of teeth one considers the speeds
g_tz—v_tz+w
of rotation f and g of the Cutting motions as Well
as the speeds of translation 17 and w of the feed-
This ratio results generally out of one or more
rather great prime numbers so that for carrying
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ing motions. A feeding motion will be regarded
it out in practice one must ‘use gear wheels with
aspositive (negative) when ithasapositive(nega- 15 many hundreds of teeth The gearings Carma
tlve) moment about Phe axls. of Phe b1ank-_
ing out these ratios must however also permit the
Methods and machlnes for cuttmg these kmd of
indentations are known and use at least two milling heads rotating about their Own axis (cutting
variation of the ratio itself, i. e. they must be
provided with change wheels, in order‘ to cut on
the machine indentations with various numbers
right angles to their own axis and to that of the
blank (feeding movement) , Whilst the blank also
rotates about its oWn- axis, as well for effecting the
rolling as for generating the longitudinal curvatllre of teeth. For practically
Various
Cutting and feeding speeds of the milling heads
gearings are commonly used, whose toothed gears
In. addition thereto these gearings must, eSDe
cially for the transmission of the cutting motion
to the mining heads, transfer the Whole cutting
energy’ so that the change wheels must have a
corresponding great rnodulusI Many teeth and a
‘ great modulus require however great dimensions
of the Change Wheels and of the change Speed
movement) and at the same time translating at 20 of teeth
have numbers of teeth such that the required
gear.
,
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.
ratios of transmission are obtained
The machine for carrying out the method ac
Ratios between the speeds of rotation and of 3° cording to the invention overcomes these di?icul
translation of the milling heads are known, being
ties by using a planetary gear connecting the
such that the speeds of rotation of the milling
'
heads cutting the concave and convex tooth faces
are different from one another and their speeds
of translation may also be uneven.
35
With known methods and machines, having so
de?ned cutting and feeding speeds selfconjugated
indentations cannot be cut in perfectly correct
shafts which impress the cutting or feeding mo
tion to the milling heads cutting the concave and
to those cutting the convex faces of teeth and
adapted to superimpose to the driving motion with
. relatively great speed of rotation and working
energy a subsidiary controlling motion with rel
atively small speed of rotation and correspond
manner, since the curvatures of the concave and
ingly low controlling energy. The controlling mo
convex tooth faces do thereby not in all cases 40 tion may be picked up from a change speed gear
result exactly equal, so that the indentations do
of the machine or from a link of the mechanism
not perfectly mesh with each other.
The object of the invention is a machine for
. transmitting the-motion to a feeding screw. The
planetary gear may be preceded by a worm gear
cutting such indentations, with which in any case
and a part of the change speed gear may be built
exactly equal pro?les and longitudinal curva- 45 itself as a planetary gear- According to an em
tures are obtained and therefore selfconjugate
indentations meshing with each other with ab-
bodiment Of theinvention the planetary gear‘may
be inserted between the feeding screws and a
solute perfection may be cut.
gearing having one or more ?xed transmission
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In carrying out the invention, the ratio. beratios may be provided between the shafts of the
tween the speeds of rotation of the milling heads 50 milling heads- According to’ another embodi
is made
ment, which may use equally great feeds for both
f__ tz+v
milling heads, the planetary gear may be inserted
g_tz+w
between the shafts of the milling heads. The
source
of energy may be applied so that the plane
‘_ and the axes of rotation of the milling heads are
55 tary gear lies within the ?ow of energy either to
2,406,009
3
heads are avoided and perfect relationship of the
curvatures of teeth is assured. The amount of
a feeding screw or ‘to a milling shaft only, or at
the same time also within the ?ow of energy to
the blank. The controlling motion for the plane
tary gear may also be picked up either before
or after the same with regard to the flow of en
this distance S may however be chosen at will,
without preventing the machine from cutting
correct selfconjugate gears.
‘The toothed gears carrying out ‘the ratio ac
cording to the inventionbetween the speeds of
rotation of the milling heads are provided at
blank axis, parallel to the blank axis, slidable' v‘two places: between shafts 33 and 43 there are
carriages for the milling heads may bepro 110' the spur wheelgear 31 with one ?xed ratio and
ergy. For setting thedistance bygwliichrthe axes
of rotation of the milling heads are displaced with
regard to one another in the direction of the
‘ .. thelplanetary gear 44, which is connected with
vided.
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,
‘the foregoing through a shaft 38 and receives the
controlling jmOtiOn from the shaft 59 through
‘ohange-speedigear 83 and worm gear 46, 45; be
bodiments given merely as examples, and pre 15 fore the feeding screw 24 there is the planetary
gear» 54,-which receives the controlling motion,
I"through? the control worm 5B and the shaft 51,
The Figure 1 is a sectional elevation of ai?rst
The appended drawings are Wdiagrammatical
views of a machine for carryingfout‘thepiethod
according to the invention shown in‘ some'em
cisely:
.
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embodiment;
,
if also-from the shaft 59.
_ w
With this machine, in order to obtain the cor
The Figure 2 is a plan view of a sec'on‘d'em
bodiment;
"
20
rect ratio
.
‘
___tz+v
' ' The Figuresis ,a-plan viewof-athirdem
bodiment.
"Many other embodimentsjarefhowever possible
according to the inventionbetween the speeds of
‘
‘
' ‘Referring to the ?gures;_r the blank'l is ?xed 25 ‘rotation of the millingheads ‘and their speeds
of translation, either thegearing 31 with ?xed
on a' rotatable, ' horizontal‘ work . table 2, carrying
ratio or the planetary gears "44 and "54 maybe
an‘index'wormwlieelt, which‘is'driven by a
conveniently‘ chosen-whilst a variation of this
worm \4 receiving the'motion "through shaft :5,
ratio is obtained byv means of the control change
bevels B and shaft 1 from the chaing‘e"spee'd gear
8 of the machine. Thelmilling heads ll, 2i are 30 speed gear 83, which has to'deal ‘only with the
‘small control energy *and therefore may have
journalled on vertically "slidable carriages I2, 22
small overall dimensions'and little weight. This
and ‘these carriagesare'.carried.by_., slides I3, 23
machine may'therefor'e'kcut any type of indenta
which : may slide horizontally‘ along; guide , ways
tions, as well those for which >w=—v (in which
90, 92 and EH, ._93.f1xed,on.the mainframe-gill!) of
case thefeeding screws l4 and 24 have equal
'the machine. The ‘slides: I3, 23 are longitudinally
great speeds of rotation and the control worm
driven.by;feeding"screws.; I4,_ “for effecting the
within ‘the invention‘.
ing :screws are .driven ibysha'fts . 64, 114, vworm
v56 remains ?xed), as those for'which w and v
are in any other ratio to one another.
shaft‘ 59 driven by the change speed gearBl of
themachine. xThe milling heads I LL21 are keyed
source of energy 35 and the blank l, the shaft
25 and both feedingyscrews I4, ‘24 as well'as the
feeding motion of the milling-heads. ,These feed
According to this embodiment‘ the fixed gear
wheelsv 65, '15, worms ;6'!, ‘Hand shafti?ii from
the change speed gear 82 of the machine. vThe 40 31 and the'planetary gear 44 are situated in the
transmission of motion between the external
changeispeed gear \82 :receives .motion from a
derivation ofjthe-control motion for both plane
tary gears‘44'and 54,’ whilst’ the planetary gear
54‘ is situated outwards “of ‘the transmission of
motion from the same source'of energyf35 w the
.on rotatable shafts 15,125 whichca'rry. ?ywheels 7
I6, 26 in order to avoid'ivibrations and'are driven
from the transmission shafts »3l,.4l which. are
connected with the main'change speed geari34,
blank and the‘ shafts of‘ theimilling heads. The
flow of energy to the blank, the shaft 25 and
driven by the source of energy 35 through-bevel
gearsu32, 42 and shaft's33, 43.‘ .The change speed
'gearsB and 8|‘ are also'in'driving relation with
the‘screw l4 passes therefore through the gear
the same source of..energy-'35.'
44, but not through the gear 54.
According to Figure l theichange speed gears
8 and 8! are connected through bevels 43"with
the»shaft~43. The shaft 66 ‘is driven from the
The source of energy 35 couldhowever'also be
located at any Oth61‘_'Sil3B, _e. gsat the shaft 29
or '51, and the gearings31 and 44 would then no
more be within the,v ?ow of energy to the blank,
change speed gear 82 ‘through a'bevel gear'?ii'.
the shaft 25 and-thelfeeding screws, but only
- within that to the, shaft l5. Further; instead of,
or in‘ addition to;la change speed gear 83, for
the-transmission of the control motion to the
planetarygear 44 or 54, another planetary gear
‘The shafts I5, 25 of the milling-‘heads- are con
nected with the transmission'shaft's 31, 4| through
spur gears ll, 21, bevel ;gea'rsTl8.-‘28, ‘vertical
shafts [9, Hand bevelgears 270,-40.‘ The main
change speed gear‘ 34 drivesgshaft 33. '
could also be used.
‘The shafts l5, 1250f the milling heads ll, 2!
are displaced with regard-to one another by the
distance S in the direotion‘of the axis of rota
tion‘ of "the blank I. This'di‘st'ance is de?ned as
the distanceof the planes parallel to thework
- 'cutting'the convex faces of teeth on the blank I
and permits a greater production to be obtained
‘from the machine, without touching anything at
the milling head ‘I l_. The milling .head'l2l is
journalledsimilarly to‘bothfother milling heads
tance S‘ is afunction of the width ‘and of the
ting edges of the'cutters andiiit isindepen'dent
'
vided with‘ three milling heads H, 2|, m. The
‘milling "head_l2l"assists’the milling head 2i in
shafts l5 and'25 of the milling heads. The dis
' radius of the milling headsgmeasured at the cut
‘
According to Figure 2, the‘ machine is pro
table '2 and'passing through the ‘axes of the
modulus of the indentation to'be cutandofthe
'
70
on‘a‘vertically dis‘placeable "carriage l22, which
may be displaced along the guide way I9! by
from‘ the number of teeth. ‘The distances-re
mains thus invariatedwhen cutting a wheel and
means of a slide I23 ancliafeeding screw I 24,
that errors of position oftheiaxes'ofs the milling
rotatable shaft l25'provi'ded with a ?y‘wheel'lZG
successivelycutting the corresponding pinion,'j_so
which is moved by the screw 24 through a bevel
gear I84. Thevmilling head [2| is keyed ona
5
and driven from vthe transmission shaft l Ml;
which is connected with the shaft 43 through a
bevel gear. I42. The milling head. I2l has alspeed
6
oth'erj place, e.‘ g. on the? shaft 4!, so that the
planetary gear would be'within the flow of en
ergy‘to all the above'named points of utilisation.
of rotation and a speed ‘of translation as great
"In the various embodiments of the machine
as those of themilling head 2|; the direction of
according .to the invention the planetary gears
these speeds ishowever different, since thelmill
andthe change gears with ?xed transmission
ing head 12! has another angular-position about
ratios may be as well made with bevel as with
‘the blank. The milling head l2l is displaced,
hypoid or spur toothed wheels, or with chain or
equally as the milling head 2|, with regard to
worm gears, etc. and they may have any trans-'
the milling head I l, by the above de?ned distance 10 mission ratio. The change speed and other gear
S in the direction of the blank axis.
ings may be made and disposed in any ‘manner
In this machine the main change speed gear
other than shown and described. The planetary
34 drives directly the shaft 43 and the shaft 3!,
gears may be inserted either in the transmission
which is connected with the foregoing one, drives
of the cutting motion (rotation) or in that of the
through a bevel gear 132 the shaft 36,,which is 15 feeding motion (translation) to one or more mill
connected through bevels 36' with the change
ing heads; a, planetary gear may be inserted also
speed gears 8 and 8|. The change speed gear 82
in the transmission of the rotating or translat
is connected with the shaft 66 through bevels
ing movement to theblank and used as well alone
66C. The milling heads 15, 25, I25 are connected
as in addition to another transmission gear of
through spur gears I1, 27, I21, bevel gears‘ I8, 20 known construction. ' The milling heads may be
28, I28, vertical shafts i9, 29, I29 and bevel gears
used in any quantity and rotate either in the
20, 40, I40 with'the transmission shafts 3|, 4!,
same or in opposite senses and they may have any
MI.
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angular position about the blank. Either a single
For setting the correct transmission ratio be
or a plurality of, conveniently synchronised,
tween the speeds of rotation and of translation
sources of energy, either electric or pneumatic,
of the milling heads cutting the concave and
hydraulic, thermic, or purely mechanic may be
those cutting the convex faces of teeth, a change
used for the various drives. Several other par
speed gear 310. with training wheels l0 giving
ticulars may also be executed in various manners
two ?xed ratios is provided between the shafts
within the limits of the appended claims.
33 and 43, and a planetary gear 54 is provided 30
I claim:
'
before the feeding shaft ‘M and- controlled,
1.
A
machine
for
cutting
self-conjugated
through a worm gear 55, 56, shaft 51 and bevel
curved indentations by continuous rolling, com
gear 58, from the shaft 59.
prising a work table, adapted to carry a blank
According to this embodiment the planetary
and having an axis of rotation, a milling head,
gear 54 is out of the flow of energy from the ex
adapted
to cut the concave faces of teeth, op
ternal source of energy to the blank and the
eratively
connected with said Work table, hav
shafts of the milling heads. The gearing 31a
ing an axis of ‘rotation and effecting a cutting
is on the contrary within the flow of energy as
motion consisting of a rotation about the said
well to the blank and the feeding screws as
own axis and a, feeding motion consisting of a
to the shaft [5. It is understood that-the milling
translation in a direction at right angles to the
head II also could be doubled, or any milling
head could be assisted by two or more others.
According to Figure 3 the main change speed
gear 34 drives the shaft 3i, which in turn drives
through bevels I32’, shaft 36 and bevels 36’ the
change speed gears 8 and 8|. Between shaft 59
and change speed gear 82 bevel wheels 60 are pro
vided. The shafts I5, 25 are driven by shafts 3|,
4| by means of bevel gears 3 la, Ma.
According to this embodiment only two milling
heads are provided, which have equally great, but
contrary feeding speeds. The feeding screws are
therefore driven with equally great speeds of
revolution. The planetary gear 44 serving for
carrying out the ratio according to the inven
tion between the speeds of rotation of the milling
heads is inserted between the shafts 33 and 33
and is controlled by shaft 59 through worm 36
acting upon its casing 49, which is formed as a
said axes of rotation of its own and of said work
table, another milling head, adapted to cut the
convex faces of teeth, having an axis of rotation
and elfecting'a cutting motion consisting'of a
rotation about the said own axis and a feeding
motion consisting of av translation in a direction
at right angles to the said axes of rotation of its
own and of said work table, means, operatively
connecting the said milling heads and adapted to
‘impress on said second mentioned milling head
a driving motion of great speed and energy and
a. superimposed, variable, control motion of little
‘ speed and energy, carriages, slidable in a direc
tion parallel to the said axis of rotation of the
work table, adapted to carry the said milling
heads and to displace same with regard to one
another.
2. A machine for cutting self-conjugated
curved indentations by continuous rolling, com
worm wheel.
.
60 prising a work table, adapted to carry a blank
On this machine the axes of the milling heads
and having an axis of rotation, a milling head,
are parallel to one another and the carriages
thereof could therefore be ?xed on the main
frame of the machine, whilst the feed would be
effected by the blank. The feeds of both milling
heads have indeed the same direction in the space
and the same value, so that the carriages are im
movable to one another and move themselves only
adapted to cut the convex faces of teeth, opera
tively connected with said work table, having an
axis of rotation and effecting a cutting motion
.consisting of a rotation about the said own axis
and a feeding emotion consisting of a translation
in a direction at right angles to the said axes of
rotation of its own and. of said work table, an
with regard to the blank.
other milling head, adapted to cut the concave
On this embodiment the planetary gear is out 70 faces of teeth, having an axis of rotation and
of the flow of energy from the source of energy
effecting a cutting motion consisting of a rota
35 to the blank I, to the shaft I5, to the feeding
tion about the said own axis and a feeding mo
screws and to the derivation of ,the controlling
tion consisting of a translation in a direction at
motion for the planetary gear itself. The source
right angles to the said axes of rotation of its own
of energy could however also, be located at any 75 and of said work table, means, operatively con
2,405,009
necting the said; milling. :heads; and :adaptedito
impress on said second. mentioned = milling head
a driving motion of greatspeedv and: energy and
a superimposed; variable, ‘controlimotion of little
speed and energy, carriages-"slidable in a direc
tioniparallel to thesaid axis‘ of‘ rotation: of the
work table, adapted 1 toq'carry the .said. milling
heads .and to displace. same with regard toone
another.
.
3. A machine for cutting. self-@conjugated
curved indentations by continuous rolling, :com
prising a work table, adapted to carry. a blank
and'having-an axis of rotation,‘ a milling. head,
adapted to cut the concave faces of teeth, being
heads .and to; displace same . with regard" to ‘one
another.
5. Av . machine. for
.
'
cutting
.
self-conjugated
curved‘ indentations by continuous rolling, com
prisinga work table, adapted‘ to carry a-blank
and havingzan axis of rotation, a milling head,
adapted to cut the concave faces‘of teeth, being
operatively connected with-said work table, hav
ing; an axis of rotation and’ eifectinga cutting
motion consisting, of a rotation about the. said
own axis and a feeding motion consisting of a
translation in‘ a direction-at right’ angles‘ to the
said axes of rotation of its own and of said work
table, another'milling head, adapted: to cut ‘the
convex faces ofteeth, having an axis of rotation
and effecting a cutting motion consisting of a
rotationjaboutthe said own axis and a feeding
motion consisting of a rotation about: the said
motionconsisting of’a translation in a direction
own: axis and a'feeding motion consisting of a
at right angles to the said axes of rotation of its
translation in a direction at right angles to the
said axes of rotation ‘of its own and of saidwork 20 own and of said work table, a planetary’ gear,
operatively connected to said milling heads and
table, another millinghead, adapted. to cut the
adapted’ to, impress on said second mentioned
convex faces of teeth, having an axis of rotation
milling head a feeding motion consisting of a
and effecting. a cutting motion consisting of‘ a
driving motion of great speed and energy and a
rotation about the said own axis and a feeding
motion consisting of a translation‘in a direction 25 superimposed, variable, control motion of'little
speed and energy, a gearing with'a plurality of
at right angles to the said axes of rotation'of its
?xed transmission ratios, operatively connecting
own and of said work table, a planetary gear,
operatively connected with said work table-,have
ingan. axis of rotation and e?ectingza cutting
the said milling heads and adapted to impress
operatively connected to said milling heads and
on said second mentioned milling head a cutting
adapted, to impress on said second mentioned
milling head a feeding motion consisting of a 30 motion consisting of a rotation at a speed being
in a given ratio to the speed of rotation of said
driving motion of great speed and energy and a
first mentioned milling, head, carriages slidable
superimposed, variable, control motion of little
speed and energy, a gearing with a ?xed trans
mission ratio, operatively connecting the said
milling heads and adapted to impress on said
second mentioned milling head a cutting motion
consisting of a rotation at a speed being in a
given ratio to the speed of rotation of said ?rst
mentioned milling head, carriages slidable in a
direction vparallel to said axis of rotationof the
work table, adapted to carry the said milling
heads-rand to displace same with regard to one
another.
I
I
4. A machine for cutting self-conjugated
curved indentations by_continuous rolling, com
prising a work table, adapted to carry a blank
and» having an axis of rotation, a millingyhead,
adapted. to cut the convex faces of teeth, being
in a direction parallel to said axis of'rotation of
the work table, adapted to carry the said milling
heads and to displace same with regard to one
another.
6. A machine for‘ cutting self-conjugated
curved indentations by continuous rolling, com
prising a, work table, adapted to; carry a'blank
and having an axis'of rotation, a milling head,
adapted tocut the convex faces of teeth, being
operatively connected with said work table, hav
ing an; axis of rotation and effecting a cutting
motion consisting of a‘ rotation about the said
owniaxis‘ and a feeding motion consisting'of a
translation in a direction at right anglesito the
saidaxes of rotation of its own and of said work
table, another milling head, adaptedtocut the
concave faces of teeth, having an axis of rota
operatively connected with said work table, hav
ing an axis of rotation and effecting-Va cutting 50 tion and effecting a cutting motion consisting ,of
a rotation about the said own axis and afeeding
motion consisting of a rotation about the said
own axis and a feeding motion consisting of a
translation in a direction at right angles’ to the
said axes of rotation of its own and of the said
motion consistingof a, translation inadirection
at right angles to the said axes of rotation of its
own and» of the said work table, a planetary gear,
work tablaanother milling head, ‘adaptedlto cut
operatively connected to said milling heads and
gear, operatively connected to said milling heads
and adapted to impress on said second mentioned
milling head a feeding motion consisting of a
driving motion of great speed and energy and a 65
the said millingheadssand adapted to impress
adapted’ to impress. on said second. mentioned
the concave faces of teeth,having an axis of ro
milling head, a feeding motion consisting of a
tation and e?ecting a cutting motion consisting
driving; motion of great speed and energy and a
of a rotation about the-said ownaxis and a feed
superimposed,’ variable, control motion of little
ing. motion consisting of a translationin a direc
tion. at rightangles to the said axes of rotation 60 speed and energy, a gearing with a plurality of
‘?xed, transmission ratios, operatively connecting
of its own and of said work‘ table,-. a planetary,
superimposed, variable, control motion of little
speed and energy, a gearing with a ?xed trans-v
mission ratio, operatively-connecting the, said
milling heads and adapted to impress on said sec
ond mentioned milling head a cuttingmotion 70
consisting of a rotation at ar'speed being in a
on said second mentioned milling head a cut—
ting motion‘ consisting of a rotation at a speed
being ina given ratio to the speed of rotation of
said ?rstmentioned milling. head, carriages slid-V
able ‘in.ai'directionparallel to said axis of rota
tiorrof the worktable, adapted to carry the said
milling heads and to displace, same :with regard
to oneanother.
'
7; Amachine for cutting selfconjugated-curved
indentations by continuous rolling, comprising a
Worketable, adapted to carry a-blank and having
an. axis? of rotation, a milling head adapted to
work table, adapted to carry thesaidt milling. 75 cut; the concave vfaces of teeth,»operatively con
given ratio to the speed of ‘rotation- of‘ said ?rst
mentioned milling head, carriages: slidable: in, a
direction parallel to-- said axis of? rotation; of the
9:
2,406,009 I
nected with said workitable', having an axis of'ro-v '4
tatlon and effecting a cutting motion consisting
of a rotation about the said own axis‘ and a feed
ing motion consisting of'a translation in a direc
tion at right angles to the said axes of rotation '
of its own and of said work table, another milling
head, adapted to out the convex faces of teeth,
having an axis of rotation and effecting a cutting
motion consisting of a rotation about the said
10v
speed gear, operatively connected with said work
table and. adapted to'impress a control motion
on said planetary- gear,’ a ‘source of energy, adapted
to drive said work table and‘ said milling heads,
being operatively ‘connected with said second
mentioned means.
“
>
'11.'A machine for cutting s'elfconju’gatedy
curved indentations by continuous rolling, com
prising a work table, a milling head, adapted to
own axis and a feeding motion consisting of a 10 cut a face of the teeth and operatively connected
translation in a direction at right angles to the
with said work table, another milling head,
said axes of rotation of its own and of said work
adapted to cut the opposite face of the teeth, a
table, a planetary gear operatively connected to
planetary gear comprising bevel wheels and op
said milling heads and adapted to impress on said
eratively connecting said milling heads, and a
second mentioned milling head a cutting motion
change speed gear, operatively connected with said
consisting of a driving motion of great speed and
work table and adapted to impress a control mo
energy and a superimposed, variable, control mo
tion on said planetary gear.
tion of little speed and energy, carriages, slidable
12. A machine for cutting selfconjugated
in a direction parallel to the said axis of rota
curved indentations by continuous rolling, com~
tion of the work table, adapted to carry the said 20 prising a work table,a milling head, adapted to
milling heads and to displace same with regard to
cut a face of the teeth and operatively connected
one another.
8. A machine for cutting selfconjugated curved
indentations by continuous rolling, comprising a
work table, adapted to carry a blank and having
an axis of rotation, a milling head, adapted to
cut the convex faces of teeth, operatively ‘con
nected with said work table, having an axis of
rotation and effecting a cutting motion consist
ing of a rotation about the said own axis and a
feeding motion consisting of a translation in a
direction at right angles to the said axes of rota
tion of its own and of said work table, another
milling head, adapted to cut the concave faces
of teeth, having an axis of rotation and effecting
a cutting motion consisting of a rotation about
with said work table, another milling head,
adapted to cut the opposite face of the teeth, a
planetary gear operatively connecting said mill
ing heads, and a change speed gear, operatively
connected with said work table and adapted to
impress a control motion on said planetary gear.
13. A machine for cutting selfconjugated
curved indentations by continuous rolling, com
v prising a work table, a milling head, adapted to
cut a face of the teeth and operatively connected
with said work table, another milling head,
adapted to cut the opposite face of the teeth, a
planetary gear operatively connecting said mill
ing heads, a change speed gear, operatively con
nected with said work table, and a worm gear
driven by said change speed gear and adapted to
the said own axis and a feeding motion consist
ing of a translation in a direction at right angles
impress a control motion on said planetary gear.
to the said axes of rotation of its own and of
14. A machine for cutting selfconjugated
said work table, a planetary gear operatively con 40 curved indentations by continuous rolling, com
nected to said milling heads and adapted to im
prising a work table, a milling head, adapted to
press on said second mentioned milling head a
cut a face of the teeth and operatively connected
cutting motion consisting of a driving motion of
with said work table, another milling head,
great speed and .energy and a superimposed,
adapted to cut the opposite face of the teeth, a
variable, control motion of little speed and en
planetary gear, operatively connecting said mill
ergy, carriages, slidable in a direction parallel to
ing heads, a pair of slides, adapted to carry said
the said axis of. rotation of the work table,
milling heads and to slide across the blank, a pair
adapted to carry the said milling heads and to
of feeding screws, operatively connected with said
displace same with regard to one another.
’
work table and adapted to drive said slides for
9. A machine for cutting selfconjugated curved
impressing a feeding motion on said milling heads,
indentations by continuous rolling, comprising a
and means, operatively connected with a said
work table, a milling head, adapted to cut a face
feeding screw and adapted to impress a control
of the teeth, means operatively connecting said
motion on said planetary. gear.
milling head with said work table, another mill- 15. A machine for cutting selfconjugated
ing head, adapted to cut the opposite face of the 5-5 curved indentations by continuous rolling, com
teeth, a planetary gear operatively connected
prising a work table adapted to carry a blank
with said above mentioned means, other means
operatively connecting said planetary gear with
said second mentioned milling head, a change
and having an axis of rotation, a pair of milling
heads, having parallel axes of rotation and each
adapted to cut a face of teeth on the said blank,
speed gear, operatively connected with said work (H) slides movable in a direction at right angles to
table and adapted to impress a control motion
the axes of rotation of the said Work table and
on said planetary gear, a source of energy,
carrying said milling heads, a planetary gear
adapted to drive said work table and said mill
means operatively connecting said planetary gear
ing heads, being operatively connected with said
and said milling heads, a source of energy oper
?rst mentioned means.
65 atively connected with said means, and means,
10. A machine for cutting self conjugated curved
operatively connected with said source of energy
indentations by continuous rolling, comprising a
and adapted to impress a rotation on said work
work table, a milling head, adapted to cut a face
table and to impress a control motion on said
of the teeth, means operatively connecting said
planetary gear.
milling head With said work table, another mill—
16. A machine for cutting selfconjugatcd
ing head, adapted to cut the opposite face of the
curved indentations by continuous rolling, com
teeth, a planetary gear, operatively connected
prising a work table adapted to carry a blank and
with said abovementioned means. other means,
having an axis of rotation, a pair of milling heads,
operatively connecting said planetary gear with
having parallel axes of rotation and each adapted
said second mentioned milling head, a change 75 to cut a face ofv teeth on the said blank, a car
11.
12:
riage, adapted.torcarry'asaidemilling head and..~
heads, a- source of‘ energy; operatively connected -
to be' displaced in a directionparallel to said axis.
of rotation of the saidwork-table;1movab1e=~in>a~=
with (said. means, and means; ,operatively; con‘
nected with said sourceiv ofenergy‘andtadapted
direction at right‘angles to:-the;1axes of rotation
of the said work-table’andcarryingrzsaidmilling
to=~impress av rotation ' on‘ said: work ‘table: and '
to impress a. 7 control- 1 motion on: -; said planetary‘
heads, a planetary gear, means operatively-con-»
gear;
necting said planetary gear and said milling
ALBERT FORSTER;
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