Improvements in Screw-making Machines.
Year: 1899

page_text: Date of Application, 9th May, 1899-Accepted, 31st Mar., 1900
COMPLETE SPECIFICATION,
Improvements in Screw-making Machines.
We, REINHOLD HAKEWESSELL, of 222, Sargent Street, Hartford, and EDWIN
CHARLES HENN, of Woodland Street, Bloomfield, both in the County of Hartford,
and State of Connecticut, U.S.A., Manufacturers, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement;
This invention relates to automatic screw-making machines of that class
embodying means whereby a series of screw-rods may be independently operated
upon simultaneously, by independent tools having separate and distinct functions;
and wherein means are provided for automatically presenting each screw-rod of
the series, after being operated upon by one tool, to the action of the next adjacent
tool, and successively, to the remaining tools of the series, whereby a plurality
of screw-rods will undergo separate and distinct operations simultaneously, and
whereby, after the first complete cycle of operations of the machine, one screw
will be completed at each successive operation of the tools.
In machines of this class, as heretofore constructed and which usually embody
a screw-rod spindle carrying turret, means imparting, intermittently, step-by-
step rotative movements of predetermined circumferential distances to said turret;
a reciprocatory main tool-carrier having a series of tools for operating upon the
rods carried by the turret spindles; means for reciprocating said main tool-
carrier; means for advancing the screw-rod; and means for rotating the rod-
carrying spindles mounted in the turret, much difficulty has been experienced.
and much work has been imperfectly done by the frequent misalinements or dis-
arrangements of the rod-carrying spindles, with respect to the tools, due to various
causes, and no machine has, to our knowledge, been heretofore devised embodying
any practicable automatic means for bringing the screw-rods successively into
alinement with the tools before said tools shall operate thereon and without dis-
continuing the operation thereon and without discontinuing the operation of the
machine whereby to obviate the aforesaid difficulty and correct a vital imper-
fection; and it is one of the chief objects to furnish a screw-making machine
including means for automatically adjusting the rod-carrying spindles succes-
sively, at predetermined points in their orbital movement, to bring each spindle
into accurate working position with the tool which is to operate thereon, and to
effect such adjustment of the spindles successively, or one at the end of each
intermittent rotation of the spindle carrying turret.
A further object of this invention is to provide in connection with the spindle-
carrying turret and reciprocatory main tool-carrier, improved differential-speed
actuating mechanism embodying means for imparting a slow advancing move-
ment to the main tool-carrier and concurrently retaining the turret at rest, and
for imparting a relatively rapid retracting movement to the main tool-carrier and
simultaneously imparting a rapid rotative movement to the turret whereby to
bring each rod-carrying spindles into position to be operated upon by the next
tool of the series, which is an improvement of extreme importance in this class
of machines as it materially lessens the time required in the making of screws
and analogous articles..

page_text: A further object of this invention is to provide, in a machine of the class
specified, an improved screw-threading device, including a series of pivoted
chasers and means for automatically opening and closing said chasers, whereby
the operation of screw-threading will be facilitated and whereby threads of any
definite length may be readily produced upon a screw-rod at different points in
the length thereof.
A further object of this invention, is to provide in a machine of the class,
specified, a tool carrier supported between the turret and tool-carrying head for
movement longitudinally, and transversely of the screw-rod, and to provide means
for automatically imparting a movement to said tool-carrier in a direction trans-
verse to the screw-rod, concurrently with the advancing movement of the main
tool-carrier, whereby the tool carried by said tool-carrier will operate upon the
end of the screw-rod simultaneously with the operations of the tools of the main
toel-carrier upon the screw-rods.
A further object of the invention is to provide, in a machine of this class,
improved clutch" devices in connection with certain moving parts of the machine,
whereby to more readily control the operation of these parts.
A further object of the invention is to provide in connection with the screw-
threading device of a machine of the class specified a starting device and means
for automatically actuating said starting device, at a predetermined point in the
advancing movement of the main tool-carrier whereby to impart a slight rapid
advancing movement of the threading device, independent of the tool-carrier, and
thereby start said threading device on the end of the screw-rod and obviate the
tearing of the threads as common in machines not provided with a screw-threading
device starter.
With these objects in view the invention consists in certain improvements, and
in certain novel details in the construction and organization of the several parts
of the screw-making machine as will be hereinafter more fully described in the
claim.
In the drawings accompanying and forming a part of this specification, Figure 1
is a plan view of a screw-making machine embodying this invention, the main
tool-carrier being shown in a partially retracted position.
Fig. 2, is a side elevation of the machine looking in the direction of the arrow,
Fig. 1.
Fig. 3, is a rear elevation, on a larger scale of the turret, rod-carrying spindles,
and a portion of the spindle and turret actuating mechanism, with a portion of
the framework of the machine, the spindles being shown in section.
Fig. 4, is a right-hand side elevation of the parts shown in Fig. 3.
Fig. 5, is a side elevation of a portion of the framing, the main tool-carrier
and the mechanism which directly controls the rotation of the tools and the
rotation of the rod-carrying spindles.
Fig. 6, is an end view of a portion of the mechanism shown in Fig. 5.
Fig. 7, is an end view partially in section of the machine as seen from the left
in Figs. 1 and 2, the section being taken on the dotted angular line Y-Z, Fig. 9,
the turret being shown locked with the spindles in proper alined position with
relation to the tools, and the turret-rotating sector or fan-wheel being shown out
of engagement with the spur-gear of said turret.
Fig. S, is a sectional end view similar to Fig. 7, of a portion of the machine,
the section being taken on the straight dotted line -y. Fig. 9, and showing the
parts in positions differing from those shown in Fig. 7.
Fig. 9, is a plan view of the turret-casing detached.
Fig. 10 is a plan view on a large scale of a portion of the spindle carrying
turret and main tool-carrier, showing in connection therewith the auxiliary
vertically movable tool-carrier.
Fig. 11, is a side elevation of the parts shown in Fig. 10, looking in the direction
of the arrow, Fig. 1.
Fig. 12, is a plan view of a portion of the turret and main tool-carrier, and

page_text: shows, in connection with the frame, the adjustable stop for gaging the position
of the screw-rod.
Fig. 13, is a side elevation of the parts shown in Fig. 12.
Fig. 14, is a plan view, on a larger scale, of a portion of the machine, including
a portion of the differential feed mechanism which controls the movements of
the turret, main and auxiliary tool-carriers, and certain other parts of the
machine.
Fig. 15, is a sectional view taken on dotted-line ww, Fig. 14, looking in the
direction of the arrow in said figure.
Figs. 16 16 and 17, are plan, sectional plan, and end views, respectively, on an
exaggerated scale, of the differential-speed mechanism clutch.
Fig. 18, is an enlarged longitudinal section of one of the screw-rod spindles and
the clutches and other controlling devices in connection therewith.
Fig. 19, is a side view of the parts shown in Fig. 18.
Fig. 20, is a sectional view on a large scale, of a portion of the main tool-carrier,
and the screw-threading instrumentalities, excluding the die.
Fig. 21, is an enlarged cross-sectional view of the parts shown in Fig. 18, taken
on the line uu, and looking in the direction of the arrow.
Fig. 22, is a side view, partly in section, of the parts shown in Fig. 21, as seen
from the left in said figure.
Fig. 23, is an end view of a portion of the die-carrying head, as seen from the
left in Fig. 20.
Fig. 24, is a plan view of a portion of the machine on an enlarged scale, showing
a portion of the screw-threading mechanism, and also showing the screw-thread-
ing device starter and the means for controlling the movement thereof.
Fig. 25, is an end view of the parts shown in Fig. 24, said figure being drawn:
in projection with Fig. 24.
Fig. 26, is a side elevation of a portion of the machine, as seen from above in
Fig. 1, and showing the devices which control the operation of the rod-spindle
clutch.
Fig. 27, is a side view partly in section, on a large scale, of a portion of the
turret and main tool-carrier, and showing in connection therewith a modified
form of screw-threading device and means for actuating said device, the tool-
carrier being shown in a retracted position, and
Fig. 28, is a view similar to Fig. 27, of the same parts showing the tool-carrier
in an advanced position or in the position it occupies after the screw-thread has
been formed on the screw-rod and the chasers of the die have been released from
said rod.
Similar characters designate like parts in all the figures of the drawings.
Briefly stated, the screw-making machine embodies in part the following co-
operative instrumentalities, which are so constructed and organized, and are so
timed in their movements as to automatically produce screws or analogous articles,
namely: a main tool-carrier supported for horizontal reciprocatory movements
and including a series of tools; mechanism for independently rotating one or
more of said tools intermittently; a work-spindle carrier or turret having a
horizontal axis, and having a series of horizontal spindle sockets; a series of red-
carrying spindles embodying rod-clamping and releasing means, and supported
for rotation in said turret; means for rotating said spindles: improved means for
intermittently advancing, and for limiting the advancing movement of, successive
screw-rods; differential-speed actuating mechanism for imparting slow advancing
movements and a relatively rapid return movements to the main tool-carrier and
for imparting rapid step-by-step rotative movements to the turret concurrently
with the return movements of said carrier; means automatically operative at pre-
determined points in the orbital movements of the spindles for independently and
successively adjusting said spindles to center them successively with respect to
a tool or tools of the main tool-carrier; a supplemental tool-carrier supported for
movement transversely and longitudinally of the screw-rod; means controlled by

page_text: the main tool-carrier for advancing and retracting the supplemental tool-carrier
concurrently with the advancing and return movements, respectively, of said main
tool-carrier; an improved screw-threading device; a screw-threading device
starter disposed in position for imparting an advancing movement to the screw-
threading device, independent of the movement of the main tool-carrier; and
means for actuating said starting device at a predetermined point in the advancing
movement of said carrier.
The framework of the machine may be of any suitable construction for carrying
the several parts, and in the form shown in the drawings, consists of a bed B,
composed of suitable side-rails, and end-rails supported on legs in the usual
manner, said legs resting on an oil-pan, as in machines of this class.
Supported in ways on the bed B, for horizontal movement, is the main tool-
carrier B, having a series of tool-carrying spindles, as 2, 3, and 4, supported
therein and preferably equidistantly disposed about a common center, one or
more of said tool spindles having means, as hereinafter described, whereby the
same may be rotated.
.:
The rod or work-spindle carrier or turret D, which will be hereinafter referred
to simply as the "turret or spindle-carrier," is shown rotatively supported in
a horizontal bearing in a turret-casing 5, shown flanged at its base and bolted to
the bed B of the machine near the forward end thereof, or at the left hand end
of The machine as shown at Figs. 1 and 2. Formed around and in parallelism
with the axis of said turret is a series of sockets or bearings in each of which is
journaled a tubular rod-carrying spindle 6, each spindle, being adapted for carry-
ing a screw-rod or piece of work to be operated upon by the tools of the main
tool-carrier, means being, provided as hereinafter described, for clamping,
releasing and advancing the screw-rod.
In the drawings, (see Figs. 2, 6, 7, 8, 18, and 19,) the turret is shown having
four spindles supported for rotation in the turret at equal distances about a
common center. These spindles, which may be duplicates of one another, are
each furnished with a driven pinion 7, fixed thereto (as shown in Figs. 3 and 4,)
and are simultaneously rotated by a driving pinion 8, secured to the forward end
of a spindle-actuating shaft E, which shaft is journaled at its forward end in the
turret and at its rear end in a bearing 9 forming part of the bed of the machine,
said shaft extending through the center of the main tool-carrier (see Fig. 5,) and
being driven at the proper speed through the medium of the main driving shaft 10,
which is operatively connected to the spindle-actuating shaft by a suitable train
of gears G, said driving-shaft being furnished with a pulley which may be driven
from any suitable source of power.
The spindle-carrier or turret D, may be constructed to carry any desired number
of spindles, and the main tool-carrier B, may likewise be constructed to carry a
corresponding, or any desired, number of tools, the number of spindles and tools,
depending of course, on the number of operations required to complete the piece
of work.
Through mechanism hereinafter described, the rod-spindles not only have a
rotative movement about their own axes, but also have intermittent orbital move-
ments about a common center. These intermittent or step-by-step orbital move-
ments are imparted to the rod-spindles for the purpose of bringing the rods
carried thereby successively into positions to be operated upon by the successive
tools of the main tool-carrier.
In practice, the turret 1 will be locked in a fixed position and held stationary
during the advancing or working movement of the main tool-carrier, and, for
the purpose of saving time in the operation of forming the screws, it is desirable
that the main tool-carrier shall have a slow advancing movement and a rapid
return movement, and that the turret D, shall have a rapid rotative movement
concurrently with the return movement of the carrier, that is to say, the main
tool-carrier and turret shall be so constructed and timed in their movements, that
the time occupied in the retractive movement of the tool-carrier and the rotative

page_text: movement of the turret shall be much less than that utilized in the advancing of
the tool-carrier or during the operation of the tools upon the rod, or, while the
turret is held stationary, and to accomplish this end, there is provided in con-
nection with the main tool-carrier and turret differential-speed actuating
mechanism, designated as a whole, and in a general way by H, (see Figs. 14
and 15,) the construction, organization, and operation of which will be herein-
after fully described.
;
The differential speed actuating mechanism, (see Figs. 1, 14, 15, and 16.) which
practically controls the movements of the turret, main tool-carrier, the rod-clamp-
ing, releasing, and feeding devices, and the supplemental tool-carriers, preferably
comprises a cam-shaft F, journaled in suitable bearings in the framework below
the bed B; a fan-wheel or sector 12, fixed to said shaft; a spur-wheel 13 fixed to
the outer end of the turret D, in position to be intermittently engaged and
rotated by the fan-wheel; a cam C, carried by the cam-shaft F, and having cam-
faces or straps 14 and 15, in position and adapted for engaging a pin 15 fixed to
the base of the main tool-carrier (see Fig. 2,) a transverse-shaft 16 journaled at
its ends in suitable bearings in the framework preferably above the cam-shaft
a worm-wheel 18 fixed to the cam-shaft; a worm 19, fixed to the transverse shaft
and meshing with said worm-wheel; two spur-wheels 20 and 21 of different
diameters, loosely mounted upon the intermediate shaft 16; a supplemental
driving-shaft 22 journaled in brackets fixed to the framework of the machine, a
pinion 23 fixed to said supplemental shaft 22 near one end thereof and meshing
with the larger gear 20 which is loosely mounted on the intermediate shaft 16, a
spur-wheel 24 fixed to the opposite end of said supplemental shaft and meshing
with the smaller spur-wheel 21 which is loosely mounted on the intermediate
shaft 16; a clutch C, keyed to the shaft 16 between the two spur-wheels 20 and 21,
and adapted for first locking one and the other of said spur-wheels to said shaft ;
a clutch actuator, designated in a general way by I, (see Figs. 14 and 15,) con-
structed and organized to automatically shift the clutch C first in one and then
in the opposite direction at predetermined points in the rotation of the cam-
shaft F, whereby to effect first a slow rotation of the cam-shaft and then a rela-
tively rapid rotation of said shaft; and driving mechanism in connection with the
supplemental driving-shaft 22, which in the present instance is shown as a train
of intermeshing bevel gears G¹, one of which is fixed to said supplemental shaft
and the other of which is fixed to a power shaft 25, to which a pulley 26 is secured
and which pulley may be driven by a belt by any suitable power shown.
It is not desired to limit this invention to the particular construction and
organization of differential-speed actuating mechanism, shown in the accompany-
ing drawings, as these may be modified somewhat without departure from this
invention.
The clutch C, is shown (see Figs. 15, 16, 16 and 17,) as a pin clutch of novel
construction having pins at opposite ends thereof adapted for engaging pins fixed
in the inner adjacent faces of the hubs of the spur-wheels 20 and 21, which are
loosely mounted on the intermediate-shaft 16. The novelty in the construction
of this pin-clutch consisting in so supporting the pins, that when they strike the
pins carried by one or the other spur-wheel hubs, said pins will yield laterally
and obviate the injurious impact occurring in pin-clutches of ordinary con-
struction. To accomplish this end, one end 271 of the main body 27 of the pin-
clutch, which is grooved circumferentially to form a seat for the shifting lever 28,
has an annular groove 29 formed in the end face thereof to receive the series of
spiral springs 30, preferably three in number one end of each spring having a
bearing against a pin 31 fixed to the recessed portion 27, and the other end of
which spring bears against a pin 32, fixed to a cap or plate 33 so connected to the
portion 27, as to be only capable of rotary movement with respect to said parts 27',
and which cap 33 has an outwardly projecting-pin 34, fixed thereto in position
and adapted for engaging the pin 35, carried on the hub of the loose spur-
wheel 21, as will be understood by reference to Figures 15, 16, 16 and 17 of the

page_text: (See
drawings. As shown in Figure 16ª, longitudinal movement of the cap 33 away
from the body of the clutch 27 is prevented by the sleeve 201 screwed into the
body of the clutch and provided with a shoulder 202. This shoulder 202 may in
some cases be omitted and the stress of the springs 30 will then be relied upon to
create sufficient friction between the pins 31 and 32, which normally bear against
each other, so as to prevent a displacement of the cap or plate 33, with relation to,
the main portion of the clutch, and longitudinally of the intermediate shaft 16.
As a simple means for actuating the clutch C, at predetermined points in the
rotative movement of the cam shaft F, a clutch actuator is provided, which prefer-
ably comprises a weighted bell-crank lever, pivoted at 36 on a bracket 37 secured
to the framework, one arm 28 of which engages in the circumferential groove of
the clutch C, and the other arm 38 of which extends inward and terminates at a
point above the cam-shaft F, at the rear end of the machine; a cam 40, fixed to
said cam-shaft and having two actuating abutments 41 and 42, respectively, the
one 41 of which is so located on the cam 40, as to strike the arm 38 of the clutch
actuator and shift the clutch into engagement with the spur-wheel 21 to effect a
rapid rotation of the worm 19 and cam-shaft F, immediately after the tools of the
main tool-carrier have completed their operation, and thus impart a quick return
movement to said carrier and a quick rotative movement to the turret.
Figures 14 and 15). The clutch actuator also embodies a curved supplemental
lever 43, which is pivotally supported on the frame at one side of the arm 38, and
has one end in position to be actuated by the abutment 42 of the cam 40 and has
its opposite end in position to engage a projection 38 of the arm 38 and impart
an opposite clutch-shifting movement thereto. The arm 38 of the bell-crank
lever of the clutch actuator and the lever 43 are operatively connected by means
of the projection 38" for alternately actuating each other, whereby their cam-
engaging ends will be brought alternately into operative relation with the cam-abut-
ments 41 and 42, respectively. On the operation of the arm 38, by the cam-abut-
ment, the clutch C', will be shifted into effective engagement with the high speed
gear 21, and the abutment engaging end of the lever 43 will concurrently be
thrown into position to be acted upon by the abutment 42, the weight 44,
accelerating the movement of these parts, and, on the actuation of the lever 43
by the abutment 42 of the cam 40, the opposite end of said lever, striking
the projection 38* on the arm 38, forces this arm with its non-weighted end into
position to be operated by the abutment 41 of said cam and at the same time
shifts the clutch C, into effective engagement with the low-speed gear 20, thus
imparting through the medium of the worm 19, and worm-wheel 18, a slow move-
ment to the cam-shaft and a corresponding slow movement to the main tool-
carrier. The fan-wheel 12, which actuates the turret, during this slow movement
of the carrier is out of engagement with the spur-wheel 13, and the turret is held
stationary, by means which will be hereinafter more fully described.
In practice (see Fig. 15,) the abutments 41 and 42, will be so disposed circum-
ferentially with respect to each other on the cam 40, that the clutch C, will be
held in operative engagement with the low-speed gear 20, for about 4 of a
complete rotation of the cam-shaft F, so that the time required for returning the
tools to their normal ineffective position will be about 15 of that utilized in the
operation of said tools.
To correct any misalinement or disarrangement of the rod-spindles with relation
to the tool or tools which are to operate on the rod, which may result from various
causes as by one spindle wearing more than another, distortion of the spindle
or spindle-carrier due to atmospheric influences, or by the springing or warping
of the framework, etc.,--there is provided in operative connection with the turret-
anu operative independent of the turret-rotating means proper, spindle adjusting
mechanism automatically operative for shifting the turret rotatably, and in a
direction contrary to the direction in which said turret is rotated by the differential
speed actuating mechanism, after each intermittent rotary movement thereof, to
bring the spindles, successively, to an accurate working or alined position with

page_text: relation to a tool, and for locking the turret after the spindle is in a true adjusted
position.
The means for shifting the turret as above described, to adjust the spindles to
correct working position, and also for temporarily, locking said turret in this
adjusted position, preferably comprises (see Figs. 7 and 8.) two cooperative stop-
members and s¹, and a turret shifting and locking member r. One of said stop
members, as s. is shown as a screw adjustably seated in a bearing formed in a
transverse shouldered portion being formed by recessing the periphery of said
turret as at 45. The head of the stop-member s. (which stop-member will for
convenience be termed a stop-abutment.") is extended beyond the face of the
shouldered portion 45, in position to cooperate with the other stop-member s¹.
This other stop-members, is shown as a reciprocatory member herein termed a
"stop"-supported in a horizontal bearing 46, on the turret casing, and is fur-
nished with a spring for projecting the same into the path of the stop-abutments.
concurrently with the arrival of the stop-recess 45', adjacent said stop s¹, as will
be readily understood.
"
<<
In practice, the number of stop-abutments s, will correspond with the number
of spindles mounted in the turret, there being four stop-abutments shown in the
present instance, one between each pair of spindles, and there being one stop s¹,
common to, and successively cooperative with, all said stop-abutments, the stop-
receiving recesses being perfectly equidistantly-disposed about the periphery of
the turret. The two stop-members s and s, will determine the working position of
each spindle, the stop being adjusted in or out as required to determine the
extent of the rotary adjustment of the turret, and consequently the working
position of each spindle.
The turret-shifting or locking member r, is shown in the nature of a bolt seated
for longitudinal movement in a bearing 47, extending outward from that side of
the turret casing opposite to that on which the bearing 46, is formed, and having
a wedge-shaped or beveled inner end which cooperates with the beveled portion
of a lock-notch formed in the periphery of the turret. Each lock-notch, there
being four shown, is disposed preferably central between two rod-spindles and are
of considerable greater width, in the direction of rotation of the turret than is the
wedge. portion of the turret-shifting and locking bolt r, for obvious reasons.
As will be understood by reference to Figs. 7, 8, and 9, the series of lock-notches
of the turret and the series of recesses 451, are not disposed exactly opposite to
each other, but are located, respectively, at different points in the length of the
turret.
As a means for actuating the turret-shifting bolt and for preventing an advancing
movement of said bolt until the stops is in an advanced position, there is provided
bolt-actuating means, which consists preferably of a bolt-retracting lever 48,
pivoted intermediate its ends, on the framework and having the lower end thereof
extending over the cam-shaft F; a disc or plate 49 fixed to the cam-shaft F: a
spring 50, secured to the upper end of the lever 48, and exerting a bolt-advancing
stress, and two cam-faced lever-actuating members 51 and 52, carried on the
disc 50, in position for actuating said lever and for holding the same in a retracted
position the proper length of time.
In operation, the bolt r, is first released from the turret, and the turret is
shifted by the cam-wheel or sector to bring the spindles into approximate working
position, the stop-abutment then being in position to engage the stop s, which is
at this time in the position shown in Fig. 7, after which the bolt r, is advanced
by the spring and its wedged portion engages the cooperative wedge face of the
lock-notch which shifts the turret in a reverse direction until the stop-abutment
tightly engages the stop, which stop and bolt prevent further movement of the
turret in either direction.
Each rod-spindle. (see Figs. 18 to 21, inclusive,) preferably comprises in part, a
rotary chuck-sleeve 52 supported. in the turret, and having at the inner working
end thereof an internally tapered chuck-compressing head 53; and a compressible

page_text: collet or chuck 54, supported for reciprocatory movement within said sleeve and
having a tapered face cooperative with the internal face of the head 53, whereby
the same is compressed to clamp the rod...
As a means for actuating the chuck to clamp the rod R, there is provided chuck
actuating means shown consisting of a tubular thrust member 55, supported for
reciprocatory movement in the sleeve 52 with its outward end in position for
engaging the inner end of the chuck whereby to advance the same to its clamping
position, and having at the opposite end thereof a collar; a pair of thrust-rod
actuating fingers 56 and 56 pivotally supported on arms fixed to a collar 57 secured
to this end of the sleeve 52, each of which fingers are somewhat L-shaped, and
have their outer ends in engagement with the outer end of the collar of the
thrust-member a groove-collar GO, loosely mounted upon the sleeve 52, for recipro-
.catory movement and having a conical end which cooperates with the inner ends
of the fingers 50 and 56, and which is adapted for spreading the ends to impart
a forward movement to the thrust member; an actuating lever 61 pivoted on the
framework (see Fig. 2,) and having a pin at the upper end thereof adapted to
enter the groove in the collar 60 when this collar, during the rotative movement
of the turret, arrives in cooperative relation with this lever; and a cam C³, fixed
to the cam-shaft and having straps so constructed and arranged as to engage a
pin 61 on, and impart chuck-opening and closing movements to, the thrust
member 55, immediately preceding and succeeding respectively, the advancing
movement of the rod R, which advancing movement of said rod is effected by
means hereinafter described. This means for feeding or advancing the screw-
rod preferably consists of a clamp-sleeve 62, supported within the tubular
thrust-member 55, and having at the outer end thereof a groove-head 63:
a clamp-sleeve actuator shown consisting of a series of pivotally supported
parallel-motion levers 64, 65, and 66, the one 64 of which has a pin at the
upper end thereof in position to enter the groove in the head 63 of the clamp-
sleeve, as shown in Fig. 2, when the spindle of this clamp sleeve arrives in a rod-
feeding position; and cam-straps fixed to the cam C2, and so disposed as to impart
a rod-advancing movement to the clamp-sleeve immediately upon the release of
said rod by the chuck 54, and for retracting said sleeve immediately after the
chuck reclamps said rod.
In some cases, as when the threading device shown in Figs. 1, 2, and 20, is
used; it is desirable to hold the rod stationary during the operation of said screw-
threading device thereon, and to accomplish this there is provided in connection
with each spindle a friction-clutch C³, which in the form shown (see Figs. 18
to 21,) comprises a recessed clutch member 67, preferably formed integral with
the pinion 7, loosely mounted on a collar 68, fixed to the sleeve 52 of the spindle,
and having two curved expansible springs 69 and 691, concentrically disposed at
different points within the recessed portion of said clutch-member, and retained
therein by a keeper or retaining-sleeve 70 keyed to the sleeve 52; and two
wedges or cam-levers 71 and 2 pivotally supported on the keeper 70, the outer
free ends of which extend beyond the face of said keeper and recessed portion of
the clutch member or recessed pinion 67, when the clutch is in an ineffective posi-
tion; a second clutch-member 67' keyed to the sleeve 52 in position to actuate the
cam-levers 71 and 72, the working ends of which levers abut against the springs,
and operate through the springs to clutch the loose member 67 to the fixed
member 67; and a series of spiral springs 73, bearing at one end against the
clutch-member 671 and at the opposite end against a disk 74 fixed to the sleeve 52,
which springs normally act to force the clutch-member 671, into engagement with
the cam-levers 71 and 72, to render the clutch operative for rotating the spindle.
As a means for actuating the clutch-member 671, to release the clutch, there is
provided a counterweighted lever 75, pivoted intermediate its ends on a bracket 76
(see Figs. 2 and 26,) and having at one end thereof a pin or projection in position
to engage the inner face of the clutch-member 671, when the spindle carrying
this clutch arrives in cooperative relation with the screw-threading device; a

page_text: lever 77 pivotally supported intermediate its ends on the framework and having
its upper end in engagement with a crank-arm 78 fixed to the pivot of the lever 75,
and having at its lower end a pin in position to be operated by cam-straps on the
cam C, whereby a retracted movement is imparted to the clutch-member 671, at
the proper moment, the counterweight on the lever 75 returning said lever to its
normal position immediately after the operation of screw-threading is completed.
The screw-threading device shown in Figs. 1, 2, and 20, comprises a die-stock
or tool-carrying spindle 2, seated for reciprocatory movement in a sleeve 80
journaled for rotation in a horizontal socket in the main tool-carrier B', and having
a pinion 81.which meshes with a gear 82, (see Figs. 6, 7, and 20,) fixed to the
spindle actuating shaft E; a pin-clutch comprising two members 83 and 84, the
one 83 of which is carried at the forward end of the sleeve 80, and the other 84
of which is carried at the forward end of the spindle or die-stock 2, and each of
which have pins, which, on the forward movement of the main tool-carrier engage
each other and cause the spindle to rotate with the sleeve, a socket, see Fig. 20,
being formed in the clutch member 84, of the spindle 2, to receive the shank or
stem of the die.
On the retractive movement of the main tool-carrier, after the thread is formed,
the rod R (which was held stationary during the threading operation) is rotated
to screw off the threading die, the clutch members 203 and 204 (shewn in dotted
lines in Figure 20) during this retractive movement of said carrier being separated,
so that the spindle 2. may be held against rotation by means hereinafter
described.
In connection with the spindle 2, there is provided a retracting device opera-
tive on the release of the screw-threading die from the rod for imparting a quick
return movement to said spindle, this consists of a spiral spring 84', surround-
ing the rear end of the spindle and bearing at its forward ends against a fixture
on the tool-carrier and at its rearward end against a bar 85, fixed to the rear end
of said spindle. This bar 85, has a set of projecting pins 86, disposed to engage
a yieldable stop-member 87 secured to the tool-carrier at a predetermined point
in the retractive movement of the main tool-carrier or at that point in the retract-
ing movement of said carrier when the clutch pins 203 and 204 are released, thus
acting to hold the spindle against rotation until the die is released from the rod,
after which the spring 841, imparts a quick return movement to said spindle.
In Fig. 1, of the drawing, the die-stock or spindle 2, is shown furnished with
an ordinary screw-threading die of the
box" type.
"
The
In Figs. 27 and 28, which illustrates a modified form of screw-threading
device, the die-stock or spindle 2 is shown furnished with a head 88 having a
series of chasers 89, pivotally supported for radial movement in longitudinal
grooves formed in said head and having their rear ends extended somewhat beyond
the rear face of said head SS; and as a means for actuating the chasers, a collar 90
is mounted upon the spindle 2, and has a conical outer end to cooperate with the
adjacent ends of said chasers on a longitudinal movement of said collar, whereby
to spread these ends and close the chasers on the end of the screw-rod.
means for imparting a chaser closing and opening movement to the collar 90, in
the form of device illustrated in Fig. 28, consists of two pivotally supported
arms 91 and 92, respectively, the lower free ends of which engage opposite ends,
respectively of the collar, said arms being pivotally carried at their upper ends
on a bracket 93, fixed to the main tool-carrier, these arms 91 and 92 are alter-
nately operated during the retractive and advancing movement of the main tool-
carrier, by means of pins 94 and 95, adjustably secured to a bar 96 fixed to the
turret casing 5, the pin 94, being so located as to engage the pivoted arm 91 at
a predetermined point in the retractive movement of the tool-carrier to effect
a chaser closing movement of the collar 90, and the pin 95 being so located on
the bar 96 as to strike the arm 92 and effect a chaser-opening movement of the
collar 90, at a predetermined point in the advancing movement of said carrier.
When this form of screw-threading device is employed, the spindle 2 will be

page_text: held against rotative movement during the screw-threading operation while the
screw-rod R will be rotated, and for this purpose a collar 97, is shown fixed to the
spindle and provided with a pin which enters a hole in the main tool-carrier
(see Fig. 27.)
As a means for starting the screw-threading die upon the end of the rod,
after said die has arrived, by the advancing movement of the main tool-carrier, in
cooperative relation with said rod, there is provided a starting device designated
in a general way by S, Figs. 24 and 25 and consisting of a crank-arm 98 fixed to
a crank-shaft journaled in a vertical bearing on a bracket 99, fixed to the. hase of
the main tool-carrier; and which shaft has at the lower end thereof another crank-
arm 98 disposed substantially at right angles to the arm 98; a thrust-pin 100,
adjustably secured in a bearing at the free end of the crank-arm 98 with its for-
ward end in alinement with, and in position to strike, the outer reduced end of
the die-spindle 2; an abutment 101, adjustably seated in a bearing in the free
end of the lower crank-arm 981; a spring 102 is fixed at one end to a projection
on the starting device and at its opposite end to a fixture of the main carrier
and adapted for normally retaining the starting device with the thrust pin thereof
out of engagement with the spindle 2; and a starting-device actuator 103, fixed
to the bed of the machine in the path of movement of the working end of the
abutment 101, and adapted, at a predetermined point in the advancing movement
of the main carrier, for effecting a die-starting movement of the starting device,
as will be readily understood by reference to Figs. 1, 24, and 25 of the drawings.
In addition to the main tool-carrier which is supported for movement longi-
tudinally of the machine, there is provided a supplemental tool-carrier, designated
by T, which is located above and at one side the rod-spindle actuating shaft E,
and which is constructed and organized for adjustment toward and from the
turret and for movements in a plane intersecting the axis of said shaft E.
This tool-carrier T comprises a slide rest supported on horizontal ways, on a
bracket 104, fixed to the turret-casing 5, (see Figs. 2, 10, and 11,) and a tool-
carrying slide (which constitutes the tool-carrier proper,) mounted on said slide
rest for vertical movement said slide being located between the turret and main
tool-carrier and in such position that the tool carried thereby may operate upon
the screw-rod of one of the spindles, means such as shown at 105, being provided for
adjusting the slide-rest horizontally.
As a means for advancing and retracting the tool-carrying slide, concurrently
with the forward and backward movement of the main tool-carrier, there is
provided a slide actuator which, in the form shown in said Figs. 2, 10, and 11,
consists of two horizontally disposed cam-straps 106 and 107, located one above
the other, and one of which straps as 107, has a cam-face 107 which cooperates
with a projection on the slide and effects, on the advancing movement of the main
tool-carrier, an advancing movement of said slide and the other of which, as 100,
has a cam-face 106 disposed in proper position for engaging another projection
on the tool-slide, at a proper point in the retractive movement of the main tool-
carrier for imparting an upward or retractive movement to said slide, these cam-
straps 106 and 107, being fixed at one end to an upright 108, secured to the main
tool-carrier as illustrated in these figures.
In addition to the main and supplemental tool-carriers, the machine is prefer-
ably provided with two horizontally-movable tool-carriers mounted, respectively,
on the opposite side rails of the bed of the machine, in position to operate upon
the rods of the two lowermost spindles. These carriers, which are designated
by L and L, respectively, may be furnished one with a turning-down tool, and
the other with a cut-off tool; and the tool-carrier T, may be furnished with a
knurling-tool. The two tool-carriers L and L', will be actuated by cam-straps on
a cam C, fixed to the cam-shaft F, through the medium of levers 109 and 110,
pivotally supported on the bed of the machine, and connected at their upper ends
to the tool-carriers L and L', respectively, as will be readily understood.
From the foregoing description, taken in connection with the accompanying

page_text: drawings, the operation of the machine should be readily understood by anyone
familiar with this class of machines, therefore, a detailed description of such
operation is deemed unnecessary.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. A screw-making machine, comprising a main tool-carrier having a series of
tools equidistantly disposed about a common center; a turret having a horizontal
axis and also having a series of rod-carrying spindles located at equal distances
about a common center, and actuating mechanism in connection with said tool-
carrier and turret, and adapted for imparting slow forward and quick return
movements to said carrier, and for imparting quick step-by-step movements to
the turret concurrently with the quick-return movements of the tool-carrier; and
means for holding the turret at rest during the forward movement of said carrier.
2. A screw-
ew-making machine embodying a turret; a reciprocatory main tool-
carrier including a screw-threading device supported therein for movements inde-
pendent of said carrier; means for advancing and retracting said carrier and for
imparting a rotative movement to the turret during the retractive movement of
the carrier; rod-spindles supported for rotation in said turret; rotating mechanism
in connection with said rod-spindles; a starting device operable at a pre-
determined point in the advancing movement of said tool-carrier for imparting a
slight advancing movement to the screw-threading device with relation to said
carrier.
3. In a screw-making machine, a reciprocatory main tool-carrier in combina-
tion with a screw-threading device supported therein for longitudinal movement;
a starting device pivotally supported on a part of said carrier and having an arm
in operative relation with the rear end of the starting device; a starting device
actuator supported on the frame of the machine in the path of movement of the
starting device and adapted at a predetermined point in the advancing movement
of said carrier for actuating the starting device to impart a slight advancing move-
ment to the screw-threading device with relation to said carrier.
4. In a screw-making machine, the combination with a rotative turret and a
reciprocatory main tool-carrier; of differential speed actuating mechanism in
operative connection with said turret and carrier, and embodying a high-speed and
a low speed train of gears, a clutch, an automatically-operative clutch-actuating
device for shifting the clutch into engagement with the high and low-speed gears,
alternately; and means for operating said speed mechanism whereby a slow for-
ward and a rapid return movement will be imparted to the carrier, and a rapid
rotative movement will be imparted to the turret concurrently with the rapid
return movement of said carrier.
5. In a screw-making machine, the combination with a rod-spindle carrying
turret, a main tool-carrier supported for movement toward and from said turret,
and with means for imparting forward and return movements to said carrier and
for imparting step-by-step rotary movements to said turret concurrently with the
return movements of said carrier, of a supplemental tool-carrier supported between
the turret and main tool-carrier; and means carried by said main tool-carrier and
operative on the forward and return movements of said carrier, for imparting
advancing and retracting movements to the supplemental tool-carrier in a plane
intersecting the line drawn through the axis of the turret.
6. In a machine of the class specified, the combination with a turret and main
tool-carrier, the latter of which is movable toward and from the former, and with
means for actuating said turret and tool-carrier as described, of a supplemental
tool-carrier supported between the turret and main tool-carrier for adjustment in
a horizontal plane, and for reciprocation in a vertical plane; and an actuator in
connection with the supplemental tool-carrier and operative on a movement of
the main tool-carrier for imparting a vertical movement to the supplemental
carrier.

page_text: .
7. In a machine of the class specified, the combination with a rotative turret:
of a series of rod-carrying spindles supported for rotation in said turret each
embodying a chuck-sleeve having a chuck compressing head; a compressible
chuck supported for reciprocation in said sleeve; a thrust-member, in, connection
with said chuck; a chuck member loosely mounted upon the sleeve and having
a pinion; a spring-actuated clutch member keyed to said sleeve and; cooperating
with said first mentioned clutch member and normally, locking said member to
the sleeve; spindle-rotating mechanism, including a gear meshing with each
pinion; means for imparting step-by-step rotative movement to said turret, and
a clutch actuating lever pivotally supported on one side the machine, in position
to engage the spring-actuated clutch member of each spindle, successively, as
said spindle, during the rotative movement of the turret arrives adjacent tlie
operating end of said lever, and a lever actuating device operative at predetermined
points in the rotative' movement of the turret for imparting a clutch-actuating
movement to said lever whereby to release the two members of said clutch and
hold the spindle stationary.
S. In a machine of the class specified, the combination with a rod-carrying
spindle supported for rotative and orbital movements, of a recessed clutch member
loosely mounted on said spindle and embodying a pinion; concentrically disposed
expansible springs; located in the recess of said member; cam-levers pivoted on
a keeper keyed to said spindle and operative for expanding said springs; a spring
actuated clutch member keyed to said spindle and normally imparting a spring
expanding movements to said cam-levers whereby both clutch members will be
locked to the spindle driving mechanism in connection with the pinion; means
for imparting orbital movement to said spindle, and means for actuating the
spring operated clutch member at predetermined points in the orbital move-
ments of said spindle to release the clutch members and hold the spindle stationary.
9. In a machine of the class specified, the combination with the turret, of a
series of spindles mounted in said turret for rotation; means for rotating said
spindles ; means for imparting rotative movements to said turret to advance said
spindles, orbitally, to successive positions; and automatic means operative alter-
nately with the turret rotating means for adjusting the turret rotatively to bring
the spindle into true working position and for locking said turret in such adjusted
positions.
10. A screw-making machine embodying a turret, a plurality of spindles
mounted in 'said turret, mechanism for imparting definite step-by-step rotative
movements to said turret; and means including a series of spindle positioning or
adjusting devices, one in operative relation with each spindle, and automatically
effective at the end of each definite rotative movement of the turret for adjusting
said spindles orbitally to center the same successively with respect to a pre-
determined point.
11. In a machine of the class specified, the combination with a turret and means
for turning the turret with a step-by-step movement, of one or more stop abut-
ments mounted for adjustment on said turret; a stop projectable into the path of
each stop-abutments for determining the position of the turret; and means for
locking said turret.
12. A screw-making machine, embodying a turret; means for imparting step-
by-step rotative movements to said turret; a stop abutment adjustably mounted
on said turret: a stop projectable into the path of the stop-abutment; and a
turret shifting device effective, intermediate to each step-by-step movement of
the turret, for shifting the same circumferentially to bring the stop-abutment into
engagement with the stop.
13. In a screw-making machine the combination with a turret having a series
of locking faces, and with automatically and intermittently operative turret rota-
ting means for imparting step-by-step rotative movements to said turret; of one
or more stop abutments adjustably mounted on the turret; a stop cooperative with
the stop-abutment; means for advancing the stop into the path of the abutment;

page_text: means operative on the rotative movement of the turret for retracting said stop;
turret-adjusting and locking bolt cooperative with the locking faces of the
turret; bolt retracting and advancing means so organized, timed and operating as
to retain the bolt out of engagement with the turret until the stop completes its
advancing movements and means for advancing bolt immediately following the
advancing movement of said stop, whereby the turret will be adjusted circum-
ferentially to bring the stop abutment and stop into engagement, and then locked
in such position.
14. A screw-making machine embodying a turret having one or more circum-
ferentially disposed adjustable stop abutments; a reciprocatory stop supported in
a fixed part of the machine and automatically projectable into the path of, and
cooperating with, the stop abutment for controlling the position of said turret ;
a reactionary shifting and locking bolt, and means for controlling the advancing
movement of the bolt.
15. A screw-making machine embodying a multi-spindle turret supported for
rotative movements and having a spur-gear; a turret-rotating mechanism
including a driving shaft and a segment carried thereby and intermittently mesh-
ing with the gear of, and imparting step-by-step rotative movements to said
turret stop-abutments adjustably mounted on the turret; a stop mounted in a
fixture on the machine and automatically shiftable into the path of the stop abut-
ments, successively: a turret-shifting and locking bolt suitable into and out of
the lock notches in the turret; and means controlled by the driving shaft for
advancing and retracting said bolt.
16. A screw-making machine embodying a reciprocating tool-carrier having
one or more tools, reciprocating means for the tool-carrier; a rotative turret having
one or more tool-spindles; automatic turret rotating means operative for impart-
ing step-by-step rotative movements of predetermined definite distances to the
turret to bring the spindle or spindles into operative relation with the tools of the
tool-carrier means automatically operative independent of the turret rotating
means for successively centering the spindles with respect to a tool or fixed point
on the machine and embodying a turret locking device.
17. In a screw-making machine, the combination with a rotative turret, and
means for intermittently rotating the same, and with a main tool-carrier and
means for moving the tool-carrier toward and away from the turret, of the screw-
threading device shiftably supported on the tool-carrier and embodying a series
of chasers or die-segments and a reciprocatory device for effecting an opening
and closing movement of said chasers, and means automatically operative on the
advancing and retracting movement of the main tool-carrier for imparting open-
ing and closing movements, respectively, to said chasers.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and 25, Cross Street, Manchester,
Agents.