Improvements in Milling Machines.
Year: 1892

page_text: Date of Application, 17th Sept., 1892
Complete Specification Left, 15th Feb., 1893-Accepted, 18th Mar.,
1893
PROVISIONAL SPECIFICATION.
Improvements in Milling Machines.
A communication from abroad from LUDWIG LOEWE & Co., of 32, Holman-
strasse, Berlin, in the Empire of Germany.
I, HARRY FRED LEE ORCUTT, of 145 Cannon Street, E.C., in the County of
London, do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in milling machines suitable for
milling articles of circular form such as hand wheels, gear wheels, groove pulleys
or any circular surface that can be produced by milling cutters. A milling machine
constructed according thereto is provided with an adjustable headstock on which
the article to be milled is secured, a stationary headstock on which the milling tool
is mounted, a bed for supporting the said headstocks, change wheels for driving the
circular feed, stop mechanism for automatically arresting the machine after the
tool has completed its operation, and with an alarm arranged to act on the operation
of the said stop mechanism.
On the fixed headstock is mounted a speed pulley from which the tool spindle is
driven through the medium of a clutch held in engagement by a catch, and adapted
to be moved out of engagement by a spring on the release of the catch. The
automatic stoppage of the machine is effected through the medium of this clutch by
means of a screw threaded rod that is moved end wise slowly during the operation
of the machine and is adapted to engage, at the proper time, an arm for releasing
the clutch. This screw threaded rod is rotated by a shaft through the medium of
a pinion that engages a toothed wheel on the said shaft. The screw threaded rod
engages with a half nut and works to and fro through the boss of the wheel by
which it is rotated. The half nut is mounted on a pivot and is provided with a
tail piece on which acts a spring that tends to engage it with the screw threaded
rod. On this rod are adjustable lock-nuts or stops. In the operation of the
machine the rod is moved slowly end wise the distance through which it must move
being regulated by the said stops, and will come in contact with and move an arm
which is mounted on a cross shaft, and with which the aforesaid catch is connected.
The screw threaded rod thus moves the catch so as to disengage the clutch and
stop machine. In this movement another arm on the cross shaft moves downward
and forces the said half nut to rise out of engagement, and at this stage the said
rod moves back into its original position under the influence of a spring provided
for the purpose the movement being limited by the said stop nuts. To reset the
clutch in gear the cross shaft is provided at its end with a handle and with an arm
engaging with the movable part of the clutch. By turning this shaft by means of
the said handle, the clutch, the catch, and the half nut can all be put in engagement
again for a fresh operation.
To throw the machine out of gear rapilly when necessary, a spring nobis
arranged in relation to the aforesaid catch in such a manner that by depressing the
knob the catch will be disengaged independently of the above mechanism and the
machine thereby stopped.
The speed pulley is mounted so as to be capable of slight endwise movement
with the clutch, and to give an alarm on the machine being stopped, the said pulley
is arranged to actuate when so moved the hammer of an alarm bell, the hammer
being for this purpose preferably mounted on a rotary shaft.
The adjustable headstock is supported on a slide rest which can be operated in
the usual manner to bring the article up to the milling tool and to move it away
therefrom as required. To facilitate adjustment of the headstock for the

page_text: milling of successive and similar articles, a stop is provided comprising a screw
threaded rod, which passes through a lug on the headstock and is provided with
adjustable lock nuts adapted to engage the said lug that serve to limit the movement
of the headstock towards the tool. By adjusting the headstock till the said lug
bears against one of the said lock nuts, a uniform depth of cut can be ensured.
For fixing the said beadstock firmly in the working position a clamping or
gripping cam with a suitable operating handle, is provided so constructed and
arranged as to lock or bind together the parts of the slide rest. In order to turn
-the article slowly while being milled, the spindle carrying the same is rotated by a
worm wheel actuated by a worm whose shaft is mounted in the slide rest, and is
driven it may be from the shaft used for automatically releasing the clutch, in any
convenient manner, as for example by a sliding bevel gear on the latter shaft
engaging a worm bevel gear on the worm shaft.
To enable the spindle carrying the work to be readily turned by hand when
necessary, it is provided with a hand wheel and with a collar or disc that is adapted
to be readily connected to and disconnected from the worm wheel by which it is
directly driven, by means of a movable pin or catch that is carried by the collar or
disc and enters a hole or recess in the worm wheel.
The adjustable and fixed headstocks are mounted on a bed some parts of which
are or may be cast hollow and are provided with doors so as to serve as tool
cupboards.
Dated this 17th day of September 1892.
W. LLOYD WISE, .
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant...
COMPLETE SPECIFICATION:
Improvements in Milling Machines.
A communication from abroad from LUDWIG LOEWE & Co., of 32, Holman-
strasse, Berlin, in the Empire of Germany.
I, HARRY FRED LEE ORCUTT, of 145 Cannon Street, E.C. in the County
of London, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement:―
This invention has reference to improvements in milling machines suitable for
milling articles of circular form such as hand wheels, gear wheels, grooved pulleys
or any circular surface that can be produced by milling cutters.
A milling machine constructed according thereto is provided with an adjustable
headstock on which the article to be milled is secured, a stationary headstock in
which the milling tool is mounted, a bed for supporting the said headstocks, change
wheels for driving the circular feed, stop mechanism for automatically arresting the
machine after the tool has completed its operation, and with an alarm arranged to
act on the operation of the said stop mechanism.
In the accompanying drawings,
Fig. 1 is a side elevation,
Fig. 2 a plan, and
Fig. 3 an end view of a circular milling machine constructed according to this
invention.
Figs. 4 and 5 show partly in elevation, and partly in section, the mechanism
employed for automatically stopping the inachine, the parts shown in Fig. 4 being
in different relative positions to those shown in Fig. 5.
Figs. 6 and 7 are end elevations, partly in section, of the said mechanism.
Figs. 8 and 9 are detail views hereinafter referred to.
A is a fixed headstock on which is mounted a speed pulley A¹.
B is the tool
spindle carrying the milling tool or cutter B¹. This spindle is mounted in the said

page_text: headstock and in a longitudinally adjustable bearing B2 and is driven from the
speed pulley through the medium of a clutch C, C and toothed wheels C² C³,
whereof C is fixed to the pulley spindle A2, whilst C is fixed to the tool spindle.
The part C of the clutch is carried by the toothed wheel C². The part C' is
connected to the speed pulley which is mounted to turn on the pulley spindle and
also to slide end ways thereou for the purpose of enabling the part C¹ to be engaged
with or disengaged from the part C of the clutch. D is a sliding catch adapted to
enter a recess C in a sliding rod C³ connected with the movable part C of the
clutch, and to hold this part in engagement with the part C. C6 is a spring acting
against a shoulder on the rod C and serving to move the part C' of the clutch out
of engagement with the part C when the rod C is released by the catch D.
*
The automatic stoppage of the machine is effected by means of a screw threaded
shaft E that is moved end ways slowly during the operation of the machine and is
adapted to engage, at the proper time, with the depending arm F of a lever fixed
upon a cross shaft F' and the other arm F2 of which is connected to the catch D.
by a link D. The screw threaded shaft E is rotated from a shaft G through the
medium of a toothed wheel E¹ having a feather and groove connection with the said
shaft E and in gear with a pinion fixed on the said shaft G, or with teeth G' formed
thereon as the example shown. The shaft G is arranged to be driven from a
shaft G that is stepped into the adjacent end of the shaft G with which it can be
engaged when desired by the movable part G³ of a clutch. This part of the clutch
is arranged to slide on but to turn with the shaft G2 and is formed at one end with
teeth or projections adapted to enter corresponding recesses in the adjacent end of
the shaft G which forms the other part of the clutch. The part G³ of the clutch
is formed with an annular groove G to receive a lever arm G fixed on a rock
shaft that extends to the front of the machine and is provided with a handle Ge.
By means of this clutch the shaft G can be readily thrown in and out of gear with
the shaft G which is driven from the pulley spindle B by means of change
wheels G by which the speed of the said shaft G G' relatively to that of the tool
spindle can be varied so as to regulate the duration of the action of the milling
tool to suit varying requirements. H is a half nut adapted to engage the screw
threaded shaft E and cause it during its rotation, to move forward through the boss
of the wheel E by which it is rotated. This half nut H is mounted on a pivot H¹
(Figs. 6 and 7) and is provided with a tail piece H that is acted upon by a
spring H³ which tends to keep the half nut in engagement with the screw-threaded
shaft E. On this shaft E is an adjustable stop E³, shown as two lock nuts, by
means of which the distance through which the screw threaded shaft will be moved
end ways can be regulated. In the operation of the machine the shaft G is
connected with the shaft G2 and the shaft E thereby caused to move slowly
forwards until it acts against the arm F of the lever and causes the other arm F
thereof to draw down the catch D and release the movable part C¹ of the clutch,
whereupon this part is pressed away from the part C by the spring C® and the
motion of the machine stopped. By this movement of the arm F, another arm Fa
(Figs. 7 and 8) fixed upon the cross shaft F' is caused to act in a downward
direction upon the tail piece H of the half nut H and cause this half nut to rise
out of engagement with the rod E. This rod is then automatically moved back
into its original position by the action of a spring E³ that surrounds the said rod
and acts against a collar or shoulder thereon, this return movement being limited
by the adjustable stop E².
"
t
The shaft G can then be disconnected from the shaft G2 by moving the clutch
part G³ to the right by means of the handle Go so that the shaft E will then be
prevented from again moving endways by the half nut H until the shaft G is again
thrown into gear with the shaft G².
To enable the operator to again put the part C¹ of the clutch in gear with the
part C after disengagement as aforesaid, the cross shaft F1 is provided with a
handle F, and with an arm Fs that enters a recess C' in the rod C' so that by
partly turning this shaft by means of the said handle in the direction indicated by

page_text: the arrow in Fig. 5, that is to say in the opposite direction to that in which it is
turned by the action of the shaft E on the arm F and the spring C on the rod C³.
the part C of the clutch, the catch D, and the half nut H can all be put into
engagement for again starting the milling tool in operation, after which the shaft G
is again connected with the shaft G2 by the clutch G³.
To enable the operator to throw the machine out of gear rapidly when necessary,
a spring plunger I is connected with the aforesaid catch D so that by depressing
the said plunger, the catch will be disengaged from the rod C independently of the
above described mechanism, and the machine thereby stopped.
In order to sound an alarm when the tool spindle is automatically stopped as
described the said pulley is arranged, when moved along the pulley spindle A² with
the part C of the clutch, to actuate the tumbling hammer of an alarm bell A*, the
said hammer being for this purpose preferably mounted on a rotary shaft provided
with a conical friction driving wheel with which the conical inner surface A³ of the
adjacent end of the pulley comes in contact when the pulley is moved endways.
As will be obvious, stop mechanism constructed and operating as hereinbefore
described can be applied to milling machines of various kinds for the purpose of
automatically throwing the milling tool or cutter out of action after it has been
in action for a predetermined time.
Jis the adjustable headstock. It is mounted to slide transversely upon a slide K
that can be moved by a screw K' in the longitudinal direction of the machine in a
manner well understood in order that the article to be machined can be adjusted to
a proper position relative to the milling cutter as required. J* is a hand wheel
connected to the screw for feeding the headstock in a transverse direction to move
the article up to and away from the milling cutter.
To facilitate this adjustment
for the milling of successive and similar articles, a stop is provided comprising a
screw threaded rod L that is fixed at one end to a lug K* on the slide K and is
provided at the other end with adjustable lock nuts L' which by acting against the
lug Jon the headstock J serve to limit the inward movement of this headstock
during adjustment towards the tool. Thus it will be seen that by adjusting the
headstock for each succeeding milling operation until the said lug J¹ bears against
the innermost of the said lock nuts L' the milling of successive articles to the same
size can be ensured.
For fixing the said headstock firmly in the working position, a clamping or
gripping cam M with a suitable operating handle M' is provided for locking or
binding the headstock to the slide K. For this purpose the cam M is pivoted in a
lug on the headstock J and is adapted, when the handle is depressed, to bear
against an outwardly projecting part M² of a gib or packing piece M³ connected to
the headstock and arranged to bear against the slide K, so that these parts then
become firmly fixed together.
In order to turn the article slowly while being milled, the spindle J2 carrying the
same is rotated by a worm wheel N actuated by a worm N₁ whose shaft is mounted
in the slide rest, and is driven from the aforesaid shaft G in any convenient manner,
as for example by bevel gearing not shown but enclosed in a casing N² (Fig. 2), or
by a sliding worm on the shaft G engaging a worm wheel on the shaft carrying the
worm N'. The worm wheel N is provided with a protective casing N*.
To enable the spindle J' carrying the work to be readily turned by hand when
necessary, it is provided with a hand wheel J³, and the connection between the
said spindle and the worm wheel N by which it is driven, is effected by a disc J
that is fixed on the said spindle and is adapted to be readily connected to and
disconnected from the worm wheel N by means of a movable spring pin or catch, .J³
that is carried by the collar or disc and enters a hole or recess in the worm wheel
as indicated in dotted lines in Figs. 1 and 2.
The adjustable and the fixed headstocks are mounted on a suitable bed some
parts of which are or may be cast hollow and be provided with doors, as indicated
at O so as to serve as tool cupboards. P is a chute or incline for receiving the
material removed by the milling tool.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A circular milling machine constructed with a rotary shaft or spindle for
carrying a wheel, pulley or other circular article to be operated upon, and with
adjustable stop mechanism adapted to automatically throw the machine out of action
when the work has been caused to turn to a predetermined extent in. contact with
the milling tool or cutter substantially as herein described.
2. In a milling machine adjustable stop mechanism comprising a clutch CC¹ the
endways movable part C' of which is connected with the driving pulley and is
provided with a spring adapted to put the two parts of the clutch out of gear, a
catch adapted to hold the said parts in gear, a rotary shaft formed with a screw
thread and provided with an adjustable stop, a lever having one of its arms connected
with the catch and the other so arranged as to be acted upon by the said rotary
shaft when the same has been moved endways through a predetermined distance, a
half nut adapted to be put into and out of engagement with the said rotary shaft,
a rock shaft provided with an arm adapted to disengage the said nut from the said
rotary shaft and with an arm for moving the two parts of the clutch into gear with
each other, and mechanism for operating the said rotary shaft from the tool spindle
substantially as described and shown.
3. A circular milling machine constructed, arranged and operating substantially
as described and shown.
H. F. L. OKCUTT.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.