Improvements in Machines for Cutting Gear Wheels.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machines for Cutting Gear Wheels.
A communication from JAMES HENRY SAGER, of 7, Lake View Park, in the City
of Rochester, in the State of New York, one of the United States of America,
Manufacturer.
I, PHILIP MIDDLETON JUSTICE, of 55, Chancery Lane, London, in the County
of Middlesex, Chartered Patent Agent, do hereby declare the nature of this inven-
tion, as communicated to me by my foreign correspondent, to be as follows:-
This invention relates to gear cutting machines, and particularly to machines
of that class which are intended to produce cut gears for cooperation with pin
gears.
For this purpose I provide a chuck for holding a blank of suitable size, means
for revolving the chuck, a cutter head carrying a single milling cutter with its
axis excentric to the axis of the cutter head or a series of cutters. Each cutter
corresponds in form to the pins upon a pin gear adapted to mesh with the cut
gear and each cutter is set at a distance from the axis of the cutter head equal to
the distance of the pin of a pin gear from the axis of rotation of said gear, means
for revolving the cutters, and a connection between the chuck and the cutter head,
whereby the two revolve together with uniform ratio of velocity.
Supplementary to the mechanism just mentioned, I provide means for adjust-
ing the position of the chuck in any horizontal direction with reference to the
cutter head, and thus to determine the angle at which the cut gear is to operate
with its pin gear, and also the depth of the cut, both toward the center of the blank
and with reference to its side faces. I also provide means for stopping the machine
automatically when the cutting of the blank has been finished, together with other
adjustments and arrangements the nature of which are hereinafter described.
Upon a table and near one end, is a chuck support, which comprises a pair of
cross slides, one of which slides substantially longitudinally with reference to
the table in guides upon a base which is set upon said table. Bolts serve to clamp
the slide upon the base. This slide is adapted to adjust the chuck to and from
the cutter head. On the slide are guides which engage in corresponding recesses
in an upper slide plate, and which are arranged to permit movement of the upper
plate transversely with reference to the line of movement of the lower plate. A
suitable screw serves to move and adjust the upper slide plate with reference to
the lower slide plate which constitutes its base. These parts are substantially the
same as the ordinary slide rest of a lathe and need no particular description.
The lower slide plate may be moved by a screw for adjustment with reference
to the base plate. Upon the lower slide are lugs, through which adjusting screws
pass, and which form adjustable stops for a lug upon the upper slide plate, so
that said upper slide plate, when operated by the screw, may be moved within
definite limits, in order that a series of blanks successively placed in the chuck
may be uniformly cut. Upon the upper slide plate a chuck is supported in a suit-
able frame which is fixed upon said plate. This frame, on one side carries a
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page_text: driving gear wheel, which is fastened upon a shaft in any suitable way, as by a set
nut. The shaft passes through a bearing upon the frame and bears a chuck
plate. In line with the shaft is a second shaft in a bearing upon the frame. The
second shaft on its inner end bears a chuck plate corresponding and opposite to
the other chuck plate. Through the center of the second shaft passes a clamping
rod which is screw-threaded on its end, in order to engage a threaded recess in the
inner end of the first shaft. The rod has a collar which presses upon the outer
end of the second shaft and when the rod is screwed into the first shaft the two
chuck plates are forced together. In order to operate the rod I provide a collar
having a suitable handle, and this collar is splined to the rod so that rotation of
the collar causes rotation of the second shaft and permits longitudinal move-
ment of the shaft with reference to the collar. The outer end of the rod is threaded
and a set nut upon the rod serves to fasten the rod with reference to the collar.
The collar rests against the outer end of the bearing for the second shaft and
by means of the set nut may be adjusted to press with such friction as may be
desired upon the end of the bearing. The clamping of the chuck plates is, how-
ever, accomplished independently of the frictional pressure of the collar upon the
bearing.
The blank which is to be cut, is formed of suitable diameter to permit the
portion out of which the teeth are to be formed, to extend outside of the edges
of the chuck plates and. has a suitable central perforation through which the rod
may pass. In order to center the blank properly, the perforation through the
blank should fit the rod. On turning the collar in the proper direction the rod
is unscrewed from the first shaft and the rod may be drawn out far enough to
release the blank from the rod and to permit it to be removed from between the
chuck plates; whereupon the parts are in position to receive a new blank. From
the construction of the parts it will be seen that chuck plates of different sizes
may be placed in the machine in order to clamp blanks of different diameters:
and the chuck-driving wheel may be replaced by another of different pitch, or
diameter, or both, as may be desired. I find that it is preferable to use chuck
plates which support the blank as near as possible to the portion to be cut.
As hereinafter described, the driving mechanism and the cutters are adjusted,
in the form of my invention described herein, to cut the spaces between alternate
pairs of teeth and to cut both sides of each tooth on two complete revolutions
of the chuck. I therefore provide half as many equidistant cutters as there are
to be pins on the pin gear with which the gear, cut in my machine, is to mesh.
This arrangement is provided so as to give better opportunity for firmly support-
ing the cutters and their driving mechanism and to reduce to the minimum the
work thrown at any one time upon the set of cutters. In some cases, however,
it would be entirely practicable to employ the same number of cutters as pins in
the pin gear which is to be used.
I provide also means whereby, in the machine described herein, at the end of
two revolutions of the chuck, the driving wheel is stopped and locked in place,
and the power is disconnected from the mechanism; but this may obviously be
modified to stop the machine at any desired point, whether the revolution of the
chuck is partial or complete or its revolutions are of any selected number.
Upon the back of the driving wheel is a socket formed, for instance, in a suit-
able rib upon said wheel. In this socket engages a spring bolt which moves in
a suitable guideway in a block supported upon a bracket behind the chuck-driving
wheel. Springs connected to said bolt and to said block tend to pull the bolt
toward the wheel. A pin extends upwardly from the bolt and through a slot in
the block provided for its movement. Upon the upper surface of the block is a
cam plate provided with a series of peripheral notches. When the pin rests upon
the periphery of the plate, the bolt is held back so that it can not enter the notch
on the chuck-driving wheel, and when a notch registers with the position of the
pin, the pin is pulled into the notch by the springs and the bolt may enter the
notch in the wheel. In order that one of the notches may register with the

page_text: position of the pin upon every alternate revolution of the chuck-driving wheel, I
provide a pin or lug upon the back of the wheel. The cam plate is revoluble and
from the upper surface of the plate extends a series of pins. Two such pins are
placed between each two adjacent notches in the plate. When the chuck-driving
wheel revolves, the pin on the wheel engages one of the pins on the cam-plate and
noves the plate from a position of registry of the bolt pin with
a notch, to a position between the position just mentioned and the
position of the next registry of the bolt-pin with a notch. Upon a second revolu-
tion of the chuck-driving wheel the pin thereon engages the next pin on the cam
plate and completes the movement of the cam plate to the position of registry
of a notch with the pin on the bolt, whereupon the pin imay pass into the notch
and the bolt is shot by the springs into the socket on the chuck-driving wheel,
and the wheel is stopped and locked. Thus, in this example of my invention, two
complete revolutions of the wheel_must occur between successive locking points.
At the other end of the table I provide a suitable head-stock for the cutter-
head. The head-stock has suitable boxes or bearings to hold the cutter head, and
between these bearings is set the driving pulley, for driving the whole machine.
The hub of this driving pulley bears an external gear wheel which drives a train
of gearing transmitting movement to a collar which has upon one end a toothed
clutch-member, and the collar revolves. upon a shaft which carries a movable
clutch collar which is splined upon the shaft and is adapted to engage with the
clutch member. The worm shaft has also a worm which meshes with a worm
wheel upon the back end of the cutter head, as explained hereinafter. The shaft
is supported in suitable boxes upon a bracket carried by the head-stock. A
handle device upon the end of the shaft may be used when it is desired to operate
the worm and the connected parts by hand. The movable clutch collar has a
groove in which rests a feather upon a block which moves in a guide-way upon
a bracket. The block moves in its guides at right angles to the line of the shaft,
but the feather upon said block is arranged diagonally thereon, so that longitu-
dinal movement of the block in its guides cause a longitudinal movement of the
clutch collar and causes engagement and disengagement of the clutch members.
An adjusting screw extends from the block through a pair of set nuts and through
a standard, in order to adjust the position of the block with reference to said
standard. This standard extends upwardly from a T-shaped bell-crank lever
which is pivoted at the intersection of its arms to the base of the head-stock. One
of the arms bears the standard and to another of the arms is pivoted a rod which
connects with one arm of a bell-crank lever which pivoted to the bracket which
carries the locking bolt. The other arm of said bell-crank lever is connected to
the bolt. A third arm of the T-shaped bell-crank lever is connected to and is
operated by a rod whereby it may be operated by hand. If now, the rod is
operated, the T-shaped bell-crank lever is turned upon its pivot and at the same
time operates the block so that the clutch collar is moved into engagement with
its driving clutch member and at the same time the other rod causes the locking
bolt to be withdrawn from the notch of the chuck-driving wheel, thus freeing
the wheel so that through the train of gearing herein before mentioned the revol-
ving of the driving pulley may drive the worm wheel and the chuck driving
wheel. In the form of device herein described, the operator must hold the rod
in its extended position until the periphery of the notched disk comes in front of
the pin of the locking bolt whereupon the lock remains disengaged and the clutch
remains engaged until the next notch in the disk registers, with the pin of the
locking bolt.
The cutter head has a slow rotary movement produced by the worm and worm
wheel, and contains, in the form herein described, four cutter heads, each of which
has a high speed of rotation. This high speed of rotation of the individual cutter
heads is obtained by direct transmission from the driving pulley, while the slow
speed of rotation of the whole head is derived from the train of gearing for driving
the worm and the worm wheel.

page_text: In order that the parts composing the cutter head shall be compact and shall
be easily removable, I arrange them as now to be described. The driving pulley
has an extended hub which rests in a suitable recess or bearing in the inner end
of a journal box, and within this hub is the extended hub of the worm wheel.
The worm wheel has a shoulder which rests against the outer end of the box,
and the pulley has a shoulder which rests against the other end of another journal
box. The hub of the pulley bears an internal gear wheel for driving the individual
cutter mandrels, as hereinafter described. In the first mentioned journal box
and inside the extended hub of the worm wheel is the cutter head mandrel which
has a flange bearing against the outer face of the other box. This cutter head
mandrel extends backward through the extended hub of the worm wheel, and the
cutter head mandrel and hub of the worm wheel are fastened together in any
suitable manner so as to rotate together. The cutter head mandrel in the form
of device herein described has four longitudinal, parallel perforations in which
rotate four cutter mandrels. The cutter-head mandrel is reduced in diameter about
mid-way of its length, so as to form a shoulder. Each cutter mandrel is reduced
in diameter, forming a shoulder which rests against a corresponding shoulder in
its own socket or perforation in the cutter head mandrel, and on the larger portion
of the cutter mandrel next adjacent to this shoulder, teeth are cut to form pinious
which mesh with the internal gear of the driving pulley. The pinions project
from the shoulder of the cutter-head mandrel.
If now,
the driving pulley, through the reducing train, drives the worm wheel
at the same time that the internal gear drives each cutter mandrel, the cutter-
head mandrel will be driven at a slow speed of rotation, while the cutter mandrels
will be driven at very high rotational speed.
Adjacent to the internal gear a bevel gear wheel is fastened upon the cutter-head
mandrel so as to revolve therewith, and this bevel gear wheel meshes with the
teeth upon the chuck driving wheel, thus rotating the chuck plates at a speed
of rotation always having a uniform ratio of velocity with reference to the
velocity of rotation of the cutter-head mandrel, and driving the chuck by positive,
direct connection between the chuck and the cutter-head.
The milling cutters may be cylindrical, and have teeth on the surface, and also
have cutting teeth on the outer ends. The stems of these cutters rest in chuck
sockets in order to be firmly held in the cutter mandrels. These chucks are of
conical form and have central cylindrical perforations wherein the cutters may
rest, and are also slit longitudinally in order to spring together in order to grasp
the cutters. These chucks are conical on the outside and fit into corresponding
conical recesses in the end of the chuck mandrels; the bottoms of the recesses are
screw-threaded and the ends of the chucks are screw-threaded to engage with the
threads in the bottoms of the sockets in the cutter mandrels. The ends of the
chucks protrude from the cutter mandrels and each one is flattened on two sides
so as to be engaged by a wrench or spanner, in order to tighten or loosen the
chucks for clamping or releasing the milling cutters.
The rear ends of the cutter mandrels are threaded, for engagement by nuts
which hold, the mandrels in place in the cutter-head mandrel. Of course, any
suitable means, other than those just described may be employed for holding the
mandrels in place in the head, and it is also obvious that many other changes
may be made in my device without departing from the nature of the invention
set forth herein.
By means of this machine I produce teeth which approximate in the highest
degree the true tooth form for engagement with a pin wheel. The cutters may
have the exact form of the pins upon the pin wheel whether the said pins are
cylindrical, conical, or of other suitable form and the teeth which are cut by
these cutters upon a blank of the proper diameter will mesh exactly with a pin
gear which is set to move with reference to the rotation of the wheel formed from
the blank, just as the series of cutters move with relation thereto, in cutting teeth
thereon.

page_text: It is obvious that, if three of the milling cutters are removed from the cutter
head, a blank may be completely cut by the single remaining cutter, but that more
revolutions of the chuck will be required in order to cut all the teeth. In some
cases the method known as indexing may have to be employed in setting the chuck
with reference to the cutter head.
Improvements in Machines for Cutting Gear Wheels.
A communication from abroad by JAMES HENRY SAGER, of 7, Lake View Park,
in the City of Rochester, in the State of New York, one of the United States
of America, Manufacturer.
1, PHILIP MIDDLETON JUSTICE, of 55, Chancery Lane, London, in the County
of Middlesex, Chartered Patent Agent, do hereby declare the nature of this inven-..
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
This invention relates to gear cutting machines, and particularly to machines of
that class which are intended to produce cut gears for cooperation with pin gears.
My invention consists in the devices, arrangements and combinations herein set
forth and claimed.
In the drawings:
Fig. 1 is a front view of my machine;
Fig. 2 is a top plan view thereof;
Fig. 3 is a end view thereof;
Fig. 4 is a rear view thereof;
In Figs. 2, 3 and 4 parts are broken away to exhibit interior constructions.
Fig. 5 is a central vertical section, on the line 5-5 of Fig. 2;
Fig. 6 is a vertical section on the line 6-6 of Fig. 2;
Figs. 7 and 8 are sections on the line 7-7, and 8-8 of Fig. 5;
Figs. 9 and 10 are diagrams to illustrate the operation of the machine;
Fig. 11 is an isometric view of a portion of the cutter head;
Fig. 12 is a view of a portion of the periphery of an angle gear cut with my
machine; and
Fig. 13 is a face view of a portion of the same angle gear.
I provide a chuck for holding a blank of suitable size, means for revolving the
chuck, a cutter head carrying a single milling cutter with its axis excentric to the
axis of the cutter head or a series of cutters. Each cutter corresponds in form
to one or more of the pins upon a pin gear adapted to mesh with the cut gear
and each cutter is set at a distance from the axis of the cutter head equal to the
distance of the pin of a pin gear from the axis of rotation of said gear, means are
provided for revolving the cutters, and a connection between the chuck and the
cutter head, whereby the two revolve together with uniform ratio of velocity.
Supplementary to the mechanism just mentioned, I provide means for adjust-
ing the position of the chuck in any horizontal direction with reference to the
cutter head, and thus to determine the angle at which the cut gear is to operate
with its pin gear, and also the depth of the cut, both toward the center of the blank
and with reference to its side faces. I also provide means for stopping the machine
automatically when the cutting of the blank has been finished, together with other
adjustments and arrangements hereinafter to be particularly described.

page_text: In the drawings, A is a table for supporting the machine, which may be sur-
rounded, as shown in the drawings, by the oil trough, a, so that the oil that is freely
used upon the cutters when operating upon the work, may, as usual in such
machines, be collected to be used again. Upon the table A and near one end, is
the chuck support, which comprises a pair of cross slides, the lower of which B
slides substantially longitudinally with reference to the table A in guides upon
the base B which is set upon said table. Bolts 61 serve to clamp the slide B
upon the base-plate B. This slide is adapted to adjust the chuck to and from
the cutter head. On the slide B are guides which engage in corresponding
recesses in the upper slide plate B2, and which are arranged to permit movement
of the upper plate 12 transversely with reference to the line of movement of the
lower plate B. A suitable screw 62 serves to move and adjust the slide plate B² with
reference to the lower slide plate B which constitutes its base. These parts are sub-
stantially the same as the ordinary slide rest of a lathe and need no particular
description. The lower slide plate B may be moved by a screw 60 for adjustment
with reference to the base plate B. Upon the lower slide B are lugs 620, through
which adjusting screws 621 pass, and which form adjustable stops for the lug 622
upon the upper slide plate B2, so that said upper slide plate, when operated by
the handle 2, may be moved within definite limits, in order that a series of blanks
successively placed in the chuck may be uniformly cut. Upon the plate B² a
chuck is supported in a suitable frame B3 which is fixed upon said plate 12.
frame, on one side carries a driving gear wheel C, which is fastened upon a shaft C
in any suitable way, as by a set nut c'. The shaft C₁ passes through a bearing 650
upon the frame B and bears a chuck plate Co. In line with the shaft C is a
shaft C2 in a bearing 63 upon the frame B. The shaft C2 on its inner end bears
a chuck plate (20 corresponding and opposite to the chuck plate Co. Through
the center of the shaft C2 passes the clamping rod C3 which is screw-threaded on
its end, as at 3, in order to engage a threaded recess in the inner end of the
shaft C. The rod C3 has a collar which presses upon the outer end of the
shaft C and when the rod is screwed into the shaft-C the two chuck plates C¹º
and C20 are forced together. In order to operate the rod C³ I provide a collar C
having a suitable handle c, and this collar is splined to the rod C³ so that rotation
of the collar causes rotation of the shaft and permits longitudinal movement of
the shaft with reference to the collar. The outer end of the rod C³ is threaded,
as at 3, and a set nut upon the rod serves to fasten the rod with reference to
the collar C. The collar C₁ rests against the outer end of the bearing 63 and by
means of the set nut may be adjusted to press with such friction as may be
desired upon the end of the bearing. The clamping of the chuck plates Co
and C20 is, however, accomplished independently of the frictional pressure of the
collar Cupon the bearing 63.
This
The blank X, which is to be cut, is formed of suitable diameter to permit the
portion out of which the teeth are to be formed, to extend outside of the edges
of the chuck plates C1 and C2 and has a suitable central perforation through
which the rod C³ may pass. In order to center the blank properly, the perfora-
tion through the blank should fit the rod 03. On turning the collar C in the
proper direction the rod C³ is unscrewed from the shaft C and the rod may be
drawn out far enough to release the blank X from the rod and to permit it to be
removed from between the chuck plates C1 and C20; whereupon the parts are in
position to receive a new blank.
From the construction of the parts it will be seen that chuck plates of different
sizes may be placed in the machine in order to clamp blanks of different diameters;
and the wheel C may be replaced by another of different pitch, or diameter, or both,
as may be desired. I find that it is preferable to use chuck plates which support
the blank as near as possible to the portion to be cut.
As hereinafter described, the driving mechanism and the cutters H are adjusted,
in the form of my invention shown herein, to cut the spaces between
alternate pairs of teeth and to cut both sides of each tooth on two

page_text: complete revolutions of the chuck. I therefore provide half as many equidistant
cutters as there are to be pins on the pin gear with which the gear, cut in my
machine is to mesh. This arrangement is provided so as to give better opportunity
for firmly supporting the cutters and their driving mechanisms and to reduce
to the minimum the work thrown at any one time upon the set of cutters. In
some cases, however, it would be entirely practicable to employ the same number
of cutters as pins in the pin gear which is to be used.
I provide also means whereby, in the machine shown, at the end of two revolu-
tions of the chuck, the driving wheel C is stopped and locked in place, and the
power is disconnected from the mechanism; but this may obviously be modified
to stop the machine at any desired point, whether the revolution of the chuck is
partial or complete or its revolutions are of any selected 'number.
Upon the back of the driving wheel is a socket c¹ (Fig. 6) formed, for instance.
in a suitable rib c100 upon said wheel. In this socket engages a spring bolt C³
which moves in a suitable guideway in a block supported upon a bracket co
behind the driving wheel C. Springs c5 connected to said bolt and to said block c
tend to pull the bolt C toward the wheel C. A pin c extends upwardly from the
bolt Cand through a slot provided for its movement. Upon the upper surface
of the block is a cam plate C provided with a series of notches c When the
pin rests upon the periphery of the plate C6, the bolt C is held back so that
it cannot enter the notch co on the wheel C, and when a notch co registers with
the position of the pin co, the pin is pulled into the notch by the springs c5 and
the bolt C may enter the notch c¹0. In order that one of the notches may
register with the position of the pin c05 upon every alternate revolution of the
wheel C, I provide a pin or lug of upon the back of the wheel C. The plate C
is revoluble upon the axis 06 and from the upper surface of the plate C extends
a series of pins 60. Two such pins being placed between each two adjacent
notches . When the wheel C revolves, the pin col engages one
the pins and moves the plate C6 from a position of registry of the pin c05
with a notch 6 (such as is shown in Figs. 2 and 6) to a position intermediate
between the position just mentioned and the position of the next registry of the
pin with a notch. Upon a second revolution of the wheel C the pin engages
the next pin 60 and completes the movement of the cam plate C to the position
of registry of a notch with the pin 5, whereupon the pin may pass into the
notch and the bolt is shot by the springs into the socket clo, and the wheel C is
stopped and locked. Thus, in this example of my invention, two complete
revolutions of the wheel C must occur between successive locking points.
of
30
At the other end of the table A, I provide a suitable head-stock 1) for the cutter-
head. The head-stock has suitable boxes or bearings d, d¹ to hold the cutter head,
and between these bearings is set the driving pulley Y, for driving the whole
machine. The hub of this driving pulley bears an external gear wheel y (see
Figs. 2, 3 and 5) which meshes with a pinion yl on a shaft yo parallel to the axis
of the driving pulley and supported in a suitable bracket yl, carried by the head-
stock D. The shaft y10 bears a bevel wheel y12 which meshes with another bevel
wheel at right angles to the shaft y10 and supported on the bracket y upon
the head-stock D. A shaft or collar y20 forming the hub of the bevel gear wheel y²,
bears also a gear wheel y22 which meshes with a gear wheely upon a collar y
which is parallel to the shaft or collar 20. This collar 30 has upon one end a
toothed clutch-member y" and the collar revolves upon a shaft y which carries
a movable clutch collar which is splined upon the shaft y' and is adapted to
engage with the clutch member y³¹. The shaft y has also a worm which
meshes with a worm wheel E upon the back end of the cutter head as explained
hereinafter. The shaft y' is supported in suitable boxes y upon a bracket y50
carried by the head-stock D. A handle device y upon the end of the shaft y'
may be used when it is desired to operate the worm and the connected parts by
hand. The collar y40 has a groove y" in which rests a feather y upon a block 60
which moves in a guide-way y¹ upon the bracket y50. The block 60 moves in its

page_text: guides at right angles to the line of the shaft y, but the feather upon said block
is arranged diagonally thereon, as shown in Fig. 2, so that longitudinal move-
ment of the block in its guides causes a longitudinal movement of the collar yo,
and causes engagement and disengagement of the clutch members 30 and y10. An
adjusting screw 10 (see Fig. 4) extends from the block y60 through a pair of set
nuts and through a standard y, in order to adjust the position of the block
with reference to said standard y. This standard y extends upwardly from a
T-shaped bell-crank lever which is pivoted at the intersection of its arms
to the base of the head-stock D (see Fig. 2). One of the arms bears the standard y²
and to another of the arms is pivoted a rod Y8 which connects with one arm of
à bell-crank lever Y which is pivoted to the bracket 50, shown in Figs. 4 and 6.
The other arm of said bell-crank lever Y is connected to the bolt C³. A third
arm of the bell-crank lever is connected to and is operated by a rod Y70 whereby
the lever may be operated by hand. If, now, the rod Y is operated, from the
position shown in Figs. 2 and 3, the bell-crank lever Y is turned upon its pivot
and at the same time operates the block y so that the clutch collar y10 is moved
into engagement with its driving clutch member y30 and at the same time the
other rod Y causes the locking bolt C5 to be withdrawn from the notch clo, thus
freeing the wheel C, so that through the train of gearing hereinbefore described
the revolving of the driving pulley Y may drive the worm wheel E and the chuck
driving wheel C. In the form of device shown, the operator must hold the rod Y
in its extended position until the periphery of the disk C comes in front of the
pin whereupon the lock remains disengaged and the clutch remains engaged
until the next notch in the disk C registers with the pin c05.
The cutter head remains to be described, and for this purpose reference may be
had to Figs. 5, 7, 8 and 11. This cutter-head has a slow rotary movement pro-
duced by the worm y3 and worm wheel E, and contains, in the form shown, four
cutter heads, each of which has a high speed of rotation. This high speed of
rotation of the individual cutter heads is obtained by direct transmission from the
driving pulley Y, while the slow speed of rotation of the whole head is derived
from the train of gearing for driving the worm y, and the worm wheel E. In
the form of device shown in the drawings, the rotation of the driving pulley Y
is reduced, about as 360 to 1, in the slow rotation of the whole cutter head, while
the cutters themselves have a higher speed of rotation than the driving pulley.
In order that the parts composing the cutter head shall be compact and shall
be easily removable, I arrange them as now to be described. The driving pulley Y
has an extended hub yo which rests in a suitable recess or bearing in the inner
end of the box d', and within this hub is the extended hub e of the worm wheel E.
The worm wheel E has a shoulder e¹ which rests against the outer end of the
box, and the pulley Y has a shoulder yo¹ which rests against the other end of
the journal box d. The hub of the pulley Y bears an internal gear wheel You
for driving the individual cutter mandrels, as hereinafter described. In the
journal box d and inside the extended hub e of the worm wheel E is the cutter
head mandrel F which has a flange f bearing against the outer face of the box d.
This cutter head mandrel extends backward through the extended hub e of the
worm wheel E, and the cutter head mandrel F and hub of the worm wheel E are
fastened together in any suitable manner so as to rotate together, as by the clamp-
ing cap E resting against the hub of the worm wheel and the screw E2 fastening
the cutter head mandrel F and the cap El together. The cutter head mandrel F,
in the form of device shown in the drawings, has four longitudinal, parallel per-
forations in which rotate the four cutter mandrels G. The cutter head mandrel F
is reduced in diameter about mid-way of its length, as at f1, Figs. 5 and 11, so
as to form a shoulder which rests against the internal gear Yo on the cutter side
of same. Each cutter mandrel G is reduced in diameter rearward of the gear You
forming a shoulder which rests against a corresponding shoulder in its own
socket or perforation in the cutter-head mandrel F, and on the larger portion of
the cutter mandrel next adjacent to this shoulder, teeth are cut to form pinions

page_text: which mesh with the internal gear Y¹ of the driving pulley Y. If, now, the
pulley Y, through the reducing train, drives the worm wheel E at the same time
that the internal gear Yo drives each cutter mandrel G, the cutter head mandrel F
will be driven at a slow speed of rotation, while the cutter mandrels will be driven
at very high rotational speed.
Adjacent to the internal gear Yol a bevel gear wheel F' is fastened, as by the
key fo, Fig. 11, upon the cutter head mandrel F so as to revolve therewith, and
this bevel gear wheel meshes with the teeth upon the the chuck driving wheel C,
thus rotating the chuck plates C1 and C20, at a speed of rotation always having a
uniform ratio of velocity with reference to the velocity of rotation of the cutter
head mandrel, and driving the chuck by positive, direct connection between the
chuck and the cutter head. In the device illustrated in the drawings the parts
are so proportioned as to cut a blank having thirty-seven teeth, as shown in Fig. 1.
It is obvious that changes in the bevel gears F and C (one or both) are neces-
sary for each change in the size of the gear to be cut by the machine.
The milling cutters H are shown as cylindrical, and have teeth, as shown, on
the surface of the cylinder, and also having cutting teeth on the outer ends. The
stems of these cutters rest in chuck sockets in order to be firmly held in the cutter
mandrels G. These chucks H¹ are of conical form and have central cylindrical
perforations wherein the cutters may rest, and are also slit longitudinally as at h¹,
(Figs. 5 and 8) in order to spring together in order to grasp the cutters. These
chucks are conical on the outside and fit into corresponding conical recesses in
the end of the chuck mandrels G; the bottoms of the recesses are screw-threaded
and the ends of the chucks H' are screw-threaded to engage with the threads in
the bottoms of the sockets in the mandrels G. The ends of the chucks H¹ pro-
trude from the mandrels G and each one is flattened on two sides, as shown at h,
(Fig. 5) so as to be engaged by a wrench or spanner, in order to tighten or loosen
the chucks H for clamping or releasing the milling cutters H.
The rear ends of the cutter mandrels G are threaded, as at g², for engagement
by nuts g3, which hold the mandrels G in place in the cutter-head mandrel F.
Of course, any suitable means, other than those just described may be employed
for holding the mandrels G in place in the head F, and it is also obvious that
many other changes may be made in my device without departing from the inven-
tion illustrated by the embodiment set forth herein.
The operation of the machine is as follows:-Starting from the position of
rest shown in the drawing, the finished blank is removed and a new blank having
a proper central perforation is inserted between the chuck plates C1 and C20, the
rod C³, is passed through the blank and is screwed into the threaded socket in the
shaft C; thus clamping the blank in the chuck. It will be understood that
previously, and by operation of the screw 62, the plate B2 which supports the
chuck and its driving wheel C has been moved toward the left in Figure 2 in order
to clear the blank from the cutters H.
ness.
This movement of the wheel C to the left, is made possible with regard to the
locking bolt C5 and the lever Y9, because, in order to disengage the blank from the
cutters, the blank need move towards the left only a distance equal to its thick-
From Figure 6 it will be seen that the pin col and the lug c are made of
dimensions sufficient to permit this movement. Besides, when the rotation of
the wheel C is stopped in order to disengage the blank X from the cutters H, even
though the lug co is pressing against the bolt C³, said bolt is moveable toward
the left (in Figure 2) in its guides, in the same line in which the wheel C is
moved, thus permitting the motion above mentioned.
Having inserted a new blank as described, the operation of the screw 62 brings
the parts back into position so that a cutter H, driven from the driving pulley Y
may cut into the blank as the chuck is brought up to place. Of course, the blank
may be partly prepared with square slots across its edge, substantially as shown
in Fig. 1, whereupon, by setting the blank in the proper position, it may be
brought up to the cutters H.

page_text: -
The driving pulley Y is now set in motion, if it has been stopped, and the mill-
ing cutters immediately revolve.
Having set a blank in the proper position with reference to the cutters, the
handle Yo is pulled from the position shown in the figures, so as to rock the bell-
crank lever Y and to pull the bolt C out from the notch co in the driving
wheel C, and at the same time to bring together the clutch members 30 and y,
thus putting in operation the screw Y, causing the slow revolution of the cutter
head and with it the revolution of the gear wheel C. If the blank is so set with
reference to the series of cutters that their axes pass across but not entirely through
the edge of the blank (see Figs. 9 and 10) teeth will be formed upon the edge of
the blank with warped flanks or side surfaces, substantially as indicated in said
Figures 9 and 10; and the four cutters shown, being equidistant but properly
separated, will cut the spaces between alternate pairs of teeth, as shown in Fig. 10.
Each cutter, as it comes into the space between a pair of teeth, cuts first the
side surfaces, marked 1, when the movements of the parts are as indicated by the
arrows in Fig. 10, and then cuts the surface of the tooth marked 2. The next
adjoining space between the teeth marked 3 in Fig. 10, is skipped by the cutters,
when arranged as herein described, and the side surface 4 is next cut by the
cutter, indicated by the circle 1b, as it enters into the space 5. In Fig. 10 the cutter
indicated by 1, and in Fig. 9 the cutter indicated by H, has reached its extreme
depth of cut so that its axis has not passed entirely across the blank X. As the
cutter indicated by the circle 1h continues its movement, the surface marked 6
(Fig, 10) will be cut away to form the side surface of a tooth opposite to the
surface marked 4. The space marked 7 will be skipped and the cutter 2h will
cut the tooth surfaces of the slot 9.
In Fig. 9 is shown a series of positions of the cutter H as it passes into and out
of a space between two adjacent teeth 21 and 11.
By providing a series of threaded sockets in the table A for the screws b' which
hold the chuck supporting device upon the table, the angle of the axis of the
chucks may be changed with reference to the axis of the cutter head or mandrel F',
in order to cut the teeth upon the blank X for operation at different angles with
the pin wheel with which they are to mesh.
The rectangular slots cut across the edge of the blank X as shown in Fig. 1,
and as indicated in Figs. 9 and 10, need not be made in the disk before it is
operated upon by the machine, although it is best to prepare the blank in advance
to this extent and to spare the gear cutter in this way.
By means of this machine teeth are produced which approximate in the highest
degree the true tooth form for engagement with a pin wheel. The cutters H may
have the exact form of the pins upon the pin wheel whether the said pins are
cylindrical, conical, or of other suitable form and the teeth which are cut by
these cutters upon a blank of the proper diameter will mesh exactly with a pin
gear which is set to move with reference to the rotation of the wheel formed from
the blank, just as the series of cutters move with relation thereto, in cutting teeth
thereon.
After the cutters have passed once around the disk and have cut alternate tooth
spaces thereon, if. with the parts arranged as herein shown, the diameter of the
blank is such as to permit the cutting of an uneven number of these teeth upon
the edge thereof the cutters will begin to cut the alternate spaces theretofore
uncut, until the blank has made a second complete revolution, whereupon the
bolt C shoots into the notch co and locks the wheel C, and at the same time, by
the action of the spring C15 through the bell-crank lever Yo, rod Y8, and bell-
crank Y, the clutch members 730 and 740 will be separated and the revolution*
of the cutter-head stops automatically.
The cutter head may be adjusted as to rotation about its axis by turning the
hand wheel 3, which operates the worm y independently of the operation of the
clutch members which normally drive the worm.
It is obvious that, if three of the milling cutters are removed from the cutter

page_text: head, a blank may be completely cut by the single remaining cutter, but that more
revolutions of the chuck will be required in order to cut all the teeth. In some
cases the method known as indexing may have to be employed in setting the
chuck with reference to the cutter head.
If the cutters are even in number and the blank is to have an even number of
teeth, it is necessary, after cutting once around to disengage the wheel C from the
wheel F, and then to reengage these wheels after having moved the wheel C
through the necessary are to bring the cutters into position for cutting the inter-
mediate spaces. This arc can be determined by moving the proper number of
teeth upon the wheel C past a point upon the wheel F, and then re-engaging
the two wheels. This is a form of indexing such as is herein before referred to.
A separate indexing mechanism is not necessary under these circumstances, but
it is obvious that an ordinary indexing mechanism may be applied to the wheel C,
viz.: such an indexing mechanism as is common upon gear cutting machines.
In general, I do not intend that my claims shall be limited to the specific forms
or devices or combinations and arrangements herein particularly described, and
I do intend that my claims shall be read and construed with all the breadth
that the actual state of the art shall permit.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is:
1. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of rotary milling cutters carried by said cutter head and having their axes
of rotation excentric to the axis of rotation of the cutter head, means for driving
the cutters at cutting speed, means for rotating the cutter head, and driving
mechanism for simultaneously rotating the chuck and the cutter head with
uniform ratio of velocity.
2. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of like rotary milling cutters carried by said cutter head and having
their axes of rotation equidistant from the axis of rotation of the cutter head,
means for driving the cutters at cutting speed, means for rotating the cutter head;
and driving mechanism for simultaneously rotating the chuck and the cutter
head with uniform ratio of velocity.
3. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of like rotary milling cutters carried by the cutter head and having their
axes of rotation excentric to the axis of rotation of the cutter head, adjusting
devices for moving the chuck to and from the cutters, means for driving the cutters
at cutting speed, means for rotating the cutter head, and driving mechanism for
simultaneously rotating the chuck and the cutter head with uniform ratio of
velocity.
4. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of like rotary milling cutters carried by said cutter head and having
their axes of rotation éxcentric to the axis of rotation of the cutter head, means
for driving the cutters at cutting speed, means for rotating the cutter head, a
single driving means for driving the cutters and for rotating the cutter head, and
driving mechanism for rotating the chuck with uniform ratio of velocity as to the
cutter head.
5 In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of like rotary milling cutters carried by said cutter head and having
their axes of rotation excentric to the axis of rotation of the cuiter head, means
for driving the cutters at cutting speed, means for rotating the cutter head.
driving mechanism for simultaneously rotating the chuck and the cutter head
with uniform ratio of velocity, mechanism for locking the driving mechanism for
the chuck at a definite position in the rotation of the chuck, and cooperating
devices for disconnecting the action of the devices for rotating the cutter head
and for, rotating the chuck.

page_text: 6. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of like rotary milling cutters carried by said cutter head and having
their axes of rotation excentric to the axis of rotation of the cutter head, means
for driving the cutters at cutting speed, means for rotating the cutter head, driving
mechanism for simultaneously rotating the chuck and the cutter head with
uniform ratio of velocity, and devices for locking said driving mechanism at a
definite position in the rotation of the chuck.
7. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of like rotary milling cutters carried by said cutter head and having
their axes of rotation parallel to each other and excentric to the axis of rotation
of the cutter head, means for driving the cutters at cutting speed, means for
rotating the cutter head, driving mechanism for rotating the chuck with uniform
ratio of velocity as to the cutter head, and angularly adjustable bearings for said
chuck and for said cutter head whereby the chuck and cutter head operate at an
angle to each other and in such position that the cutters cut teeth transversely
upon a blank in the chuck.
8. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of parallel rotary milling cutters carried by said cutter head and having
their axes of rotation excentric to the axis of rotation of the cutter head, said
cutters being rotatable independently of said cutter head, a driving pulley, means
for rotating the cutter head from the driving pulley at one speed, means for rotat-
ing each milling cutter from the driving pulley at another speed, and driving
mechanism for rotating the chuck with uniform ratio of velocity as to the cutter
head.
9. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of parallel rotary milling cutters carried by said cutter head and having
their axes of rotation excentric to the axis of rotation of the cutter head, said
cutters being rotatable independently of said cutter head, a driving pulley, means
for rotating the cutter head from the driving pulley at one speed, means for
rotating each milling cutter from the driving pulley at another speed, driving
mechanism for rotating the chuck with uniform ratio of velocity as to the cutter
head, and automatic devices for stopping and locking the chuck at a definite
position in the rotation of the chuck."
10. In a gear cutter, the combination of a rotary chuck, a rotary cutter head,
a series of parallel rotary milling cutters carried by said cutter head and having
their axes of rotation excentric to the axis of rotation of the cutter head, a driving
pulley, means comprising a worm gearing for rotating the cutter head from the
driving pulley at one speed, means for rotating each milling cutter from the
driving pulley at another speed, means for rotating the chuck with uniform
ratio of velocity as to the cutter head, a clutch for connecting and disconnecting
the worm gearing from the action of the driving pulley, and devices cooperating
with said clutch for locking the chuck at a definite position in its rotation.
11. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, one or more milling
cutters carried by said cutter head, each having its axis of rotation excentric to
the axis of rotation of the cutter head, mechanism for automatically feeding said
chuck by rotation upon its axis and by positive connection with the cutter head,
whereby to cut a series of teeth upon a blank held by said chuck, mechanism
for driving said cutters at cutting speed, and mechanism for driving said cutter
head and said chuck simultaneously with uniform ratio of velocity.
12 In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck,' one or more milling
cutters carried by said cutter head, each having its axis of rotation excentric to
the axis of rotation of the cutter head, mechanism for automatically feeding said
chuck by rotation upon its axis and by positive connection with the cutter head
whereby to cut a series of teeth upon a blank held by said chuck, mechanism for
driving said cutters at cutting speed, mechanism for driving said cutter head and

page_text: said chuck simultaneously with uniform ratio of velocity, and mechanism for
adjusting said chuck toward and from the cutters in a line transverse to the axis
of the cutter head.
13. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, one or more milling
cutters carried by said. cutter head, each having its axis of rotation excentric
to the axis of rotation of the cutter head, mechanism for automatically feeding
said chuck by rotation upon its axis and by positive connection with the cutter
head, whereby to cut a series of teeth upon a blank held by said chuck, mechanism
for driving said cutters at cutting speed, mechanism for driving said cutter head
and said chuck simultaneously with uniform ratio of velocity, mechanism for
adjusting said chuck toward and from the cutters in a line transverse to the axis
of the cutter head, and stops for determining the extent of movement of said means
for adjusting the chuck.
14. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, one or more milling
cutters carried by said cutter head, each having its axis of rotation excentric to
the axis of rotation of the cutter head, mechanism for automatically feeding said
chuck by rotation upon its axis and by positive connection with the cutter head,
whereby to cut a series of teeth upon a blank held by said chuck, mechanism for
driving said cutters at cutting speed, and mechanism for driving said cutter head
and said chuck simultaneously with uniform ratio of velocity, said chuck being
carried by cross slides having adjustable stops for determining the limits of its
movement.
15. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, one or more milling
cutters carried by said cutter head each having its axis of rotation excentric to
the axis of rotation of the cutter head, mechanism for automatically feeding said
chuck by rotation upon its axis and by positive connection with the cutter head,
whereby to cut a series of teeth upon a blank held by said chuck, mechanism for
driving said cutters at cutting speed, mechanism for driving said cutter head
and said chuck simultaneously with uniform ratio of velocity, and mechanism for
locking the chuck at a definite position in the rotation thereof.
16. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, one or more milling
cutters carried by said cutter head, each having its axis of rotation excentric to
the axis of rotation of the cutter head, mechanism for automatically feeding said
chuck by rotation upon its axis and by positive connection with the cutter head,
whereby to cut a series of teeth upon a blank held by said chuck, mechanism for
driving said cutters at cutting speed, mechanism for driving said cutter head and
said chuck simultaneously with uniform ratio of velocity, mechanism for locking
the chuck at a definite position in the rotation thereof, and cooperating devices.
for disconnecting the action of the devices for driving the cutter head and the
chuck.
17. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, a rotary milling cutter.
carried by said cutter head and having its axis of rotation excentric to that of the
cutter head, means for driving the cutter at cutting speed, means for rotating the
cutter head and the chuck simultaneously with uniform ratio of velocity, whereby
the cutter moves in a circular path toward and from the chuck while the chuck
revolves upon its axis.
18. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck a rotary milling cutter
carried by said cutter head and having its axis of rotation excentric to that of the
cutter head, means for driving the cutter at cutting speed, mechanism for rotating.
the cutter head and the chuck simultaneously with uniform ratio of velocity
by positive connection between the chuck and the cutter head, whereby the cutter

page_text: moves in a circular path toward and from the chuck while the chuck is revolving
upon its axis.
19. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, a rotary milling
cutter carried by said cutter head and having its axis of rotation excentric to
that of the cutter head and parallel thereto, means for driving the cutter at cut-
ting speed, and mechanism for driving the cutter head and said chuck simul-
taneously with uniform ratio of velocity, whereby the cutter moves_in_a
circular path toward. and from the chuck while the chuck revolves upon its axis.
20. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, a rotary milling
cutter carried by said cutter head having its axis of rotation excentric to that
of the cutter head and parallel thereto, means for driving the cutter at cutting
speed, and mechanism for driving said cutter head and said chuck simultaneously
with uniform ratio of velocity by positive connection between the chuck and the
cutter head, whereby the cutter moves in a circular path toward and from the
chuck while the chuck revolves upon its axis.
21. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, a rotary milling
cutter carried by said cutter head and having its axis of rotation excentric to
that of the cutter head,, means for driving the cutter at cutting speed, means for
rotating the cutter head and the chuck simultaneously with uniform ratio of
velocity, whereby the cutter moves in a circular path toward and from the chuck
while the chuck revolves upon its axis, and automatic devices for locking said
chuck at a definite position in its rotation.
22. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, a rotary milling
cutter carried by said cutter head and having its axis of rotation excentric to that
of the cutter head, means for driving the cutter at cutting speed, mechanism for
rotating the cutter head and the chuck simultaneously with uniform ratio of
velocity by positive connection between the chuck and the cutter head, whereby
the cutter moves in a circular path toward and from the chuck while the chuck
revolves upon its axis, and automatic devices for locking said chuck at a definite
position in its rotation.
23. In a gear cutter, the combination of a rotary chuck, a rotary cutter head
having its axis of rotation at an angle to that of the chuck, a rotary milling
cutter carried by said cutter head and having its axis of rotation excentric to that
of the cutter head, means for driving the cutter at cutting speed, mechanism for
rotating the cutter head and the chuck simultaneously with uniform ratio of
velocity by positive connection between the chuck and the cutter head, whereby
the cutter moves in a circular path toward and from the chuck while the chuck
revolves upon its axis, automatic devices for locking said chuck at a definite
position in its rotation, and cooperating devices for disconnecting the action of
the mechanism for rotating the cutter head and the chuck.
a
24. In a gear cutter, the combination of a rotary cutter head containing a rotary
cutter mandrel excentric to the axis of the cutter head, said mandrel having
pinion thereon, a driving pulley having an internal gear meshing with said pinion,
mechanism for driving said cutter head from said pulley, a rotary chuck, and gear-
ing for driving said chuck from said cutter head.
25. In a gear cutter, the combination of a rotary cutter head containing a
rotary cutter mandrel having its axis excentric to that of the cutter head, said
mandrel having a pinion thereon, a driving pulley having an internal gear mesh-
ing with said pinion, mechanism for driving said cutter head from said pulley,
a rotary chuck, gearing for driving said chuck from said cutter head, and auto-
matic mechanism for disconnecting the mechanism for driving the cutter
head at a definite position in the rotation of the chuck.
26. In a gear cutter, the combination of a rotary cutter head containing a rotary

page_text: cutter mandrel having its axis excentric to that of the cutter head, said mandrel
having a pinion thereon, a driving pulley having an internal gear meshing with
said pinion, mechanism for driving said cutter head from said pulley, a rotary
chuck, gearing for driving said chuck from said cutter head, automatic mechanism
for disconnecting the mechanism for driving the cutter head at a definite position
in the rotation of the chuck, and cooperating mechanism for locking the chuck
at said definite position in its rotation.
27. In a gear cutter, the combination of a rotary cutter head containing a
series of parallel rotary cutter mandrels, each mandrel having a pinion thereon,
a driving pulley having an internal gear meshing with said pinions, an external
gear upon said driving, pulley, a train of gearing from said external gear to said
cutter head, a rotary chuck, and gearing for driving said chuck from said cutter
head.
28. In a gear cutter, the combination of a rotary cutter head containing a series
of parallel rotary cutter mandrels, each mandrel having a pinion thereon, a driving
pulley having an internal gear meshing with said pinions, an external gear upon
said driving pulley, a train of gearing from said external gear to said cutter head,
a rotary chuck, gearing for driving said chuck from said cutter head, means for
connecting and disconnecting said train of gearing, and automatic means for
lecking the chuck at a definite position in its rotation.
29. In a gear cutter, the combination of a rotary cutter head containing a series'
of parallel rotary cutter mandrels, each mandrel having a pinion thereon, a driving
pulley having an internal gear meshing with said pinions an external gear upon
said driving pulley, a train of gearing from said external gear to said cutter head,.
a rotary chuck, gearing for driving said chuck from said cutter head, automatic
means for locking the chuck at a definite position in its rotation, and means
operating simultaneously with said automatic locking means for disconnecting
the action of the driving mechanism from said cutter head and from said chuck.
30. In a gear cutter, the combination of a rotary cutter head containing a series
of parallel rotary cutter mandrels, each mandrel having a pinion thereon, a driving
pulley having an internal gear meshing with said pinions, an external gear upon
said driving pulley, a train of gearing from said external gear to said cutter head,
a rotary chuck, gearing for driving the chuck from said cutter head, automatic
means for locking the chuck at a definite position in its rotation, and means
operated by said locking means for disconnecting the action of the driving pulley
from said cutter head and from said chuck.
31. In a gear cutter, the combination of a rotary chuck, a cutter head F con-
taining one or more rotary cutter mandrels G, each mandrel having a chuck H
for a cutter and a pinion g whose teeth protrude through the surface of the cutter
head, a worm wheel E fastened to said cutter head, a driving pulley Y having
an internal gear Yol meshing with the pinions of said cutter mandrels and an
external gear y, a worm y42 meshing with the worm wheel E for driving the
cutter head, a worm shaft y, a pair of clutch members 30, 40 on said worm shaft y',
a train of gearing from said external gear to one of said clutch members, and
driving mechanism for said clutch actuated from said cutter head.
32. In a gear cutter, the combination of a rotary chuck, a cutter head F, fitting
in a bearing box d and containing one or more rotary cutter mandrels G, each
mandrel having a chuck H' for a cutter and a pinion g whose teeth protrude
through the surface of the cutter head, a worm wheel E fastened to said cutter
head having an extended hub e fitting on one end of said cutter and in a bearing
box, a driving pulley Y having a hub portion fitting upon said extended
hub e and within a portion of said box d, an internal gear Yol on said pulley Y
meshing with said pinions 9, an external gear y upon said driving pulley, a
worm meshing with said worm wheel E, a worm shaft y', a pair of clutch
members 30, 40 on said worm shaft, a train of gearing from said external gear
to one of said clutch members and driving mechanism for said chuck actuated
from said cutter head.

page_text: 33. The combination of a rotary cutter head, a series of independently rotatable
cutter mandrels carried by said head, means for driving said cutter head and
said cutter mandrels, a chuck device consisting of the clamping plates C1, C20,
the shafts C C² rotatable in suitable bearings and each carrying one of said clamp-
ing plates, a clamping rod Chaving a collar c passing through the shaft C
and adapted to be screwed into the shaft C, whereby to move the plate C20 and to
clamp a blank between said chuck plates, a gear wheel C upon said shaft C', and
a gear wheel F¹ upon said cutter head for meshing with said gear wheel C.
34. The combination of a rotary cutter head, one or more rotatable cutter
mandrels carried by said cutter head, a gear wheel on said cutter head, a driving
pulley having gearing for rotating said cutter mandrels; a train of gearing from
said pulley to said cutter head, a chuck device comprising a gear wheel C for
gearing with said gear wheel on the cutter head, a socket co in said gear wheel C,
a spring bolt C adapted to enter said socket and to lock said gear wheel and the
chuck at a definite position in the rotation of the latter, a rotary circular plate Cº,
and having one or more peripheral slots c, a pin upon the bolt C adapted to
enter the slot c6 when, in the revolution of the plate C, the slot registers with
the position of the pin, and means for rotating said plate C by said gear wheel C.
Dated the 27th day of December 1898.
PHILIP M. JUSTICE.