Improvements in Apparatus for Making Screws, Pillars, Pinions, Studs, and other Small Articles.
Year: 1894

page_text: Date of Application, 1st Aug., 1894
Complete Specification Left, 1st June, 1895-Accepted, 3rd Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Making Screws, Pillars, Pinions,
Studs, and other Small Articles.
1, CHARLES JAMES HEWITT of 5 High Street, Prescot in the County of
Lancaster, Watch Manufacturer, do hereby declare the nature of this invention to
be as follows:-
This invention has for its object an automatic machine for making screws,
pillars, studs, pinions & other small articles which embodies most of the modern
methods, and includes a slitting attachment.
The following description will cover the principal features common to automatic
watch-screw machines.
All screws are cut from the solid rod or wire. Four rods of any desired length
are inserted in hollow spindles, which are horizontal and parallel to one another;
and the machine being then started works unattended until it has cut up the rods
into screws, complete with slits, when it automatically stops, until four fresh rols
are inserted; and the operation is repeated. The use of four rods, which is the
distinguishing feature of the machine, renders it possible to have all the four tools
in operation simultaneously. It is plain that turning down the shank by the first
tool and screwing it by the second cannot be done together, where only one screw
at a time is being operated upon; nor can the burr from screwing be removed
by the third tool, and the parting cut be made by the fourth, until the screwing is
finished. Therefore in machines working upon only one rod, three at least of the
tools must be idle, while the fourth only is at work.
LATHE SPINDLES, HEADSTOCK AND TURRET.
There are four hollow revolving lathe-spindles, carried horizontally in the main
frame or headstock, which is a box casting. Each of these spindles runs in
hardened and ground bearings, and is provided with friction driving-cones and
automatic chuck. This combination allows of the rotation of the spindle being
stopped at will, and also of the rod or wire being released when required, for
feeding forward. The four spindles are driven by a belt which passes continuously
round the driving pulley on each spindle in succession. They are placed at equal
distances apart, and concentric with a horizontal revolving turret, upon which are
mounted the four operating tools. This turret has a step by step rotation, through
a quarter of a revolution at each step, thereby bringing the tools round into such
a position that each tool acts successively upon each screw. Given the required
position, the first tool will be turning down the shank of the screw in the lathe
at the right-hand top corner; the second tool carrying the screwing die will be
cutting the thread on the screw in the right-hand bottom lathe; the third tool
will be removing the burr from the thread of the screw in the left-hand bottom
lathe; the fourth tool will have just given the parting cut to the screw in the
left-hand top lathe; and in the centre of the turret this same screw will now be
having the slit cut in its head by the slitting saw, to which it has been brought by
the quadrantal carrier.

page_text: previously been nearly parted from the rod by the fourth tool. When the shoulder
of the screw jams against the face of the chuck, it twists the screw off, and leaves
it in the carrier. The carrier then has a short horizontal longitudinal motion
away from the lathe spindle, and a transverse quadrantal motion towards the
slitting saw, assuming the inner position. After the short longitudinal movement
is completed, and before the quadrantal movement commences, the carrier chuck
makes a quarter turn on its arm, which brings it at right angles to the lathe
spindle, and therefore ready for the slitting saw to act. After the slitting is
completed, the motions are reversed; the carrier chuck first resumes its position
parallel to the lathe spindle, and then returns for the next screw. During the
return motion, the chuck levers engage with a fixed cam on the turret, thus opening
the chuck, and thrusting the complete screw out of the chuck into a recess made
for the purpose.
All the movements of the carrier are got from two cams, also
at the back of the machine. The first cam is a face can, which, through a lever
connection, gives the short longitudinal forward movement; and the second cam,
through a quadrant and pinion, gives the turning and quadrantal movements. The
turning of the carrier chuck, from a position parallel to the lathe spindle to one
at right angles to it, is got from the rocking movement of the longitudinal shaft
in the turret. The carrier chuck is carried on the end of a second shaft, parallel
to the face of the turret, and mounted in a frame; this frame is carried on the
end of the longitudinal rocking shaft, and is free to revolve about the latter,
while the carrier-chuck shaft is also free to revolve in the frame. The two shafts
are connected by a pair of mitre wheels. It is thus plain that any circular motion
given to the longitudinal rocking shaft must either rotate the carrier-chuck shaft
or revolve the whole arrangement. In order to obtain each of these two motions
in succession, two springs are planted on the turret so as to engage with the
carrier frame. One of these at first holds the carrier frame, so as to prevent it
from revolving; the longitudinal shaft then revolves independent of it, and,
through the mitre wheels, rotates the carrier-chuck. When the chuck has made
the necessary quarter turn, a stop prevents any further rotation of the chuck shaft;
and the pressure continuing, the holding spring is overcome, and the quadrantal
movement travels the chuck inwards to the slitting saw.
After each screw is taken from the wire or rod, the latter has to be fed forward
through the lathe chuck through a sufficient distance for making another screw.
The mechanism for effecting this consists of a hollow feed-chuck, which passes
into the lathe spindle from the back. The front end of this feed clinck has three
longitudinal slots, extending about 24 inches in length, thus forming three spring-
fingers closed in at the nose so as to grip the rod lightly. When the main chuck
is gripping the rod more tightly, the feed chuck is pulled backwards by a cam
and lever and slips along the rod. As soon as the main chuck opens, the feed
chuck springs forward, carrying the rod with it. The opening of the main chuck
takes place during the quarter revolution of the turret; and the wire springing
forward abuts against an adjustable stop carried on the turret.
This stop 13
planted in such a position on the turret as to continue opposite the end of the
lathe spindle all the time that the chuck is open. When the feed stop has passed
over the end of the lathe spindle, the wire projecting from the face of the chuck
engages with the tail of a click, and so prevents the click from catching in a
loose concentric ring immediately at the back of the turret. This loose ring is
connected by levers to the striking gear of the countershaft.
If the click were
not held away from the loose ring, it would engage in one of four slots or notches
cut across the inner rim of the ring, and so would carry the ring round with the
turret, thereby throwing the strap upon the loose pulley. When the rod is all
used up, no wire is fed forward; the click being therefore not held away engages
in the loose ring, and the machine stops.

page_text: ROTATION Or Turret.
The means by which the step by step rotation is given to the turret, through
a quarter of a revolution at each step, is as follows:-
The lecking slide, carried in a radial recess in the body of the turret, has a
V-shaped notch in its outer end, for engaging successively with each of the four
radial taper stops in the headstock, towards which it is pressed outwards by a
spring at the back. In each revolution of the main driving shaft, the cam strikes
the lug on the inner end of the slide, and draws the slide inwards, clear of the
stop. In this position, it is held back by the nose of the side click, against
the outer pressure of the spring, after the tip of the cam has cleared the lug.
The opposite cam now comes against the lug, and carries the slide and turret round
through a quarter of a revolution to the next stop. Just before reaching this
position, the tail of the click, striking against the stop, releases the slide, which is
immediately thrown into action by the spring, and again locks the turret in its
new position, while the main driving shaft makes another complete revolution.
An alternative arrangement for revolving the turret is as follows:-
A worm wheel cut on to the turret, or fastened to it, is driven by a corresponding
worm, by a round band working on a pulley on a worm shaft. A cam inside the
turret releases a pawl much in the same way as the other arrangement, when the
worm shaft begins to revolve, and so carries the turret round to the next stop,
where the band slips on the worm pulley until the cam releases it again for another
quarter turn.
The speed of the turret is slightly slower than that of the cam shaft, thus, the
nib of the releasing cam gets sufficiently in front to allow the slide or stop to
engage with the face of the corresponding stop.
Dated this 31st day of July 1894.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for the Applicant.
Improvements in Apparatus for Making Screws, Pillars, Pinions,
Studs, and other Small Articles.
I, CHARLES JAMES HEWITT of 5 High Street, Prescot in the County of
Lancaster, Watch Manufacturer, do bereby 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 for its object an automatic machine for making screws, pillars,
studs, pinions and other small articles, which embodies most of the modern methods,
and includes a slitting attachment.
In this machine all screws are cut from the solid rod or wire. Four rods of any
desired length are inserted in hollow spindles, which are horizontal and parallel to
one another; and the machine being then started works unattended until it has cut
up the rods into screws, complete with slits, when it automatically stops until fresh
rods are inserted into the empty spindles and the operation is repeated. The use
of four rods, which is the distinguishing feature of the machine, renders it possible
to have all the four tools in operation simultaneously. It is plain that turning
down the shank of the screw by the first tool and screwing it by the second cannot
be done together, where only one screw at a time is being operated upon; nor can
the burr from screwing be removed by the third tool, and the parting cut be made
by the fourth, until the screwing is finished, therefore in machines working upon

page_text: Figure 3 a front elevation; and
Figures to 17 fragmentary views, some of which are enlarged of a machine
constructed according to this invention.
Figure 18 is a diagrammatic view of the belt driving mechanisin.
LATHE SPINDLES, HEADSTOCK AND TURRET.
A A A A are four hollow revolving lathe-spindles carried horizontally in the
main frame A' or headstock, which is a box casting. Each of these spindles runs
in hardened and ground bearings, and is provided with friction driving-cones and
automatic chuck to be hereinafter described. This combination allows of the
rotation of the spindle being stopped at will, and also of the rod or wire from
which the screws are made being released when required, for feeding forward
hereinafter described. The four spindles are driven from four counter-shafts, the
counter-shafts are in turn driven by one continuous belt which takes a zigzag
course over the pulleys, on each of these counter-shafts are pulleys Z (Figure 18),
these pulleys 7 through belts drive the spindle pulleys A (Fig. 18). The
spindles are placed at equal distances apart and concentric with a horizontal
revolving turret B (Figures 1 & 3) upon which is mounted the four operating
tools CCCC³ (Figure 3). This turret B which is driven by pulley b (Figure 3)
and worm (Figure 12. 4) has a step by step rotation through a quarter of a
revolution at each step thereby bringing the tools round into such a position that
each tool acts successively upon each screw in a manner hereinafter described.
Given the required position, the first tool C will be turning down the shank of the
screw in the lathe A, C is shown in the drawing at the top centre of the machine;
the second tool C in the right-hand lathe, carrying the screwing die will be cutting
the thread on the screw; the third tool C2 in the bottom centre lathe will be
removing the burr from the thread of the screw; the fourth tool C³ in the left
hand lathe will have just given the parting cut to sever the head of the screw from
the rod or bar and by the following movement of the turret the same screw will be
brought by a quadrantal carrier hereinafter described to a point on the central axis
of the turret, here to be slit by the slitting saw hereinafter described. After the
slitting of the head of the screw has been accomplished the carrier chuck opens and
drops the screw which is then finished.
Through the centre of the turret B runs the can shaft B' (Figures 1 and 2)
from which all the four tools C C C C³ are actuated; it is driven at a uniform
speed by a worm D and wormwheel D' (Figure 1) at the back end of the machine.
One revolution of the cam shaft completes a screw; and the following quarter
revolution is occupied in carrying the turret round through the next quadrant,
when the operations of the four tools are repeated. Thus five revolutions of the
cam shaft make four screws, a quarter revolution of the turret being utilised to
open the chucks, and feed the wire forward for the next screw in a manner
hereinafter described. The opening of the chucks is effected by the cams or
projections E and E₁ carried on the turret B (Figure 3) which strike in turn each
of the four levers F pivoted at on the main frame A'; the cam E (Figure 3)
stopping the lathe spindle and also opening the chuck in order that the wire E'
(Figures 1 and 4) may be fed forward. This cam E operates the spindle to which
the turning down tool C is approaching. The cam E' is placed so as to operate
the spindle to which the screwing die is approaching and it is such that it causes
only sufficient motion to the lever F (Figure 3) so that it releases the pulley A³
(Figures 1, 2 and 4) and the lathe spindle stops while the thread is being put on

page_text: the screw.
In this case the lever F (Figure 3) is not moved far enough to release
the grip of the chuck T¹ (Figure 4) on the wire E' (Figure 4). These levers
operate slides G on the frame of the machine by means of adjustable links F¹
which are attached to the slides at F, and links g, being attached to the slides
at and to arms or levers g' (Figures 1 and 4) at 3, operate the cams g² which in
turn operate the levers H which are in contact with pins h (Figure 8) conveying
the motion to the face of the male friction cones A³ driving the hollow spindles A.
The links F (Figure 3) connecting levers F with the slides G are adjustable in
length by means of the nut and right and left handed screws whereby the
movement of lever H can be varied. A slight motion of these levers suffices to
throw the pulleys A² containing the female portion of the friction clutch out of
action and stop each lathe spindle; and a still further motion of the levers push
the friction cone A³ (Figures 1 and 4) against the spring disc A, Figure +,
thereby by means of pin a releasing the grip of the chuck on the wire or rod E',
Figure 4. The arrangement which stops the machine when the rod or wire is used
up is also actuated by the motion of the turret, as will be described later on.
TURNING AND SCREWING.
The three turning tools C C³ C³ (Figure 3) are made in the form of circular
discs, turned on the periphery to the section required, so that they may be ground
economically without spoiling their shape; as the tools C C C (Figure 3) become
ground away it is necessary to set them with their cutting edge opposite the lathe
spindle, this is arranged for by having a series of holes in the cutter which fit onto a
pin in a metal plate and by twisting the cutter round from one hole to another.
The cutter is mounted upon this metal plate having a circular slot in one end, this
slot is of such a length that it will regulate the edge of the cutter between any two
of the holes in the cutter. These three cutters are carried on straight slides I
(Figures 1 and 3) mounted radially on the face of the turret B and receive their
feed directly from three cams J, (Figures 1 and 3 only one cam shown in Figure 3)
through adjustable connections 1 12 which supply the means in a manner well
known for setting the cutters so as to turn to the correct diameter. The screwing
arrangement is connected with a cam K at the back of the machine, by means of a
horizontal shaft K' (Figure 2) running through the turret: the form of cam K is
such, that it gives a reciprocating motion to the pivoted quadrant K² (Figure 2),
the said toothed quadrant gears with the pinion K on the shaft K' in the turret,
and so gives it a reciprocating rotary motion, this shaft K is in turn geared to the
die spindle L (Figure 7), which thus receives a forward motion for running the die
on to the screw, and a backward motion for running it off. The die spindle is also
mounted in a sliding head M which slides in a direction parallel to the axis of the
screw. This sliding motion is controlled by a leading screw M, Figure 7, which
is geared to the die spindle through a series of change gears, much the same as in
an ordinary screw-cutting lathe. Thus the reciprocating motion of the quadrant
not only imparts circular motion to the die, but, through the change wheels and
leading screw, gives also a longitudinal motion corresponding with the pitch
required.
SLITTING SAW.
The slitting saw N (Figure, 1, 2, 3, 13) is carried in a frame N' (Figures 1, 2, 3,)
secured on one end of a rocking shaft N (Figures 1, 3, 13) which runs through
the turret B horizontally, parallel to the main shaft. On the back end of the shaft
is an arm N³ (Figures 1, 12, 13,) carrying a roller n, which engages with the
slitting cam N. The cam is shaped as shown in Figure 12 so as to give a slow
forward rocking motion to the slitting frame N' and saw, and a quick return.
the moment that the saw is cutting the slit, the saw spindle n' is approximately
this arreturoment is made in order that the driving cord
At

page_text: DCREW
KRIERS.
The quadrantal carrier O (Figures 1, 3, 13 also parts in 14, 15, 16) which
conveys the screw from the parting tool to the slitting saw has five distinct motions.
It carries a split chuck O, (Figures 13 and 14) tapped to correspond with the
thread of the screw. Normally, the chuck is held closed by a spring o (Figures 3
& 13 and 14), drawing it (the chuck) into a taper hole'. When thus closed, it
runs on to the revolving screw, which has previously been nearly parted from the
rod by the fourth tool.
A recess q, Figure 2, in the cam Q allows the spindle S to be drawn inwards by
the springs, (Figure 1) so that the tapped chuck O' (Figures 3 & 14) may run
onto the thread of the screw. When the chuck O' has run on the screw so as to
jam against the head (the screw at the same time is parted by the tool C Figure 3)
it twists the screw off, and leaves it in the chuck O', which is part of the quadrantal
carrier O. The carrier having twisted off the screw is then ready for the next
forward movement of the turret B to convey it (the screw) to a point on the
central axis of the turret where the slitting saw is passed through the head of it.
Alter the carrier has twisted off the serew it has a short horizontal movement
away from the lathe spindle, caused by the roller q' (Figure 2) being forced out of
the recess (by the rotating of the cam Q) which operates the lever Q2 (Figure 2)
giving a torward movement to the shaft S (Figures 1 and 2). The shaft S is then
given a rotary motion by the cam Q (Figures 1, 2 and 11) through the toothed
quadrantal lever R (Figures 1, 2 and 11) and pinion R' on the shaft S. The
carrier shaft O to which the chuck O' is attached receives a quarter turn (may
be regulated by pins S (Figure 16) and is prevented from turning further by the
pin S' in the slot S° (Figure 16)) from the shaft S through the bevel wheels S³
(Figures 1 and 13).
It will be clearly seen from the drawings (Figures 1, 13 and 16) that when the
shaft 03 containing the chuck O' has moved through the space allowed by the
pin S and the slot S (Figure 16) that the whole carrier will turn, this is also
regulated by the stops m (Figure 5) and m' (Figure 13) to turn through a quarter
of a revolution, which brings the head of the screw to a int on the central axis
of the turret ready for the slitting saw to be passed through (shown in dotted lines,
Figure 13). After the slitting is completed, the motious are reversed; the carrier
chuck first resumes its position parallel to the lathe spindle, and then returns for
the next screw. During the return motion, the chuck levers o² (Figures 3, 13
and 14) engage with a fixed cam P (Figure 13) on the turret, this opening the
chuck, and thrusting the complete screw out of the chuck into a receiver made for
the purpose. The screw is thrust out of the chuck by pusher rod 0³ (Figure 14),
from the construction of the levers o³ (Figures 3, 13, 14), it will be clearly seen
that the pusher rod will move more rapidly than the tapped chuck O' (Figure 14).
When the end of the lever o² is operated upon by the cam P (Figure 13), the
result is that the finished screw is shot out of the chuck during the return
movement of the carrier into the before mentioned receiver. All the movements
of the carrier are got from two cams Q Q also at the back of the machine. The
first cain is a face cam, which, through a lever connection Q gives the short
longitudinal forward movement; and the second cam Q', through a quadrant R
and pinion R, gives the turning and quadrantal movements. The turning of the
carrier chuck, from a position parallel to the lathe spindle to one at right angles to
it, is got from the rocking movement of the longitudinal shaft S in the turret. The
carrier chuck o' is carried on the end of a second shaft 02, parallel to the face of
the turret, and mounted in a frame 82; this frame is carried on the end of the
longitudinal rocking shaft S, and is free to revolve about the latter, while the
carrier-chuck shaft O' is also free to revolve in the frame S2. The two shafts are
connected by a pair of mitre wheels St. It is thus plain that any circular motion
given to the longitudinal rocking shaft S must either rotate the carrier-chuck shaft

page_text: or revolve the whole arrangement. A suitable friction device, not shown in the
drawings, holds the carrier frame, so as to prevent it from revolving until the
carrier shaft 03 and chuck O' have rotated through quarter a revolution then
the friction is overcome and the whole carrier and frame turn through a quarter of
a revolution, as shown in Figure 13, from the full to the dotted lines.
FEED.
After each screw is taken from the wire or rod E' the latter has to be fed
forward through the lathe chuck through sufficient distance for making another
screw. The mechanism for effecting this consists of a hollow feed chuck T,
Figure 4, which passes into the lathe spindle from the back. The front end of
this feed chuck has three longitudinal slots, extending about 2 inches in length,
thus forming three spring fingers closed in at the nose so as to grip the rod E
lightly. At the time the wire is being screwed the main churk of the lathe
spindle T (Figures 1 and 4) is gripping the wire very tightly, during this time the
feed chuck T (Figure 4) which is gripping the wire less tightly, is drawn back
over the wire by a cam T2 (Figures 1 and 4) and lever T a distance equal to the
length of the screw. As soon as the main chuck opens, the feed chuck springs
forward, by means of spring t (Figure 4) carrying the rod with it. The opening
of the main chuck T₁ takes place during the quarter revolution of the turret B;
and the wire or rod E' (Figures 1 and 4) springing forward abuts against an
adjustable stop U (Figure 3) carried on the turret B. This stop is placed in such
a position on the turret as to continue opposite the end of the lathe spindle all th
time that the chuck is open. Just in front of the leading tool C (Figure 3) on th
turret there is placed a click U which engages the wire E' (Figure 4) projecting
from the chuck T' of the lathe spindles, this click U in turn engages a spring
pawl (shown in dotted lines, Figure 3), which is normally pressed against a
ring V (Figures 1 and 3), encircling the turret. This ring V has four recesses
which correspond with the four lathe spindles in such a way that when the click U¹₁
(Figure 3) is engaging the wire E' (Figure 1) the pawl u (Figure 3) is opposite
the recess in the ring V, but as the click U₁ (Figure 3) is engaging the wire E'
(Figure 1) it holds the spring pawl u (Figure 3) from entering the recess in the
ring V (Figures 1 and 3). Now it is evident as the wire rods E (Figures 1 and 4
in the lathe spindles A become used up, and there is no more to bo fed out, that
the click U (Figure 3) will have nothing to engage and the pawl u (Figure 3)
will enter the recess in the ring (Figures 1 and 3) and the ring V will turn with
the turret. Now by an arrangement of levers shown at W W, Figure 3, the main
driving belt, or the belt which drives the shaft from which the counter-shafts are
driven, is thrown onto a loose pulley by the revolving of the ring V (Figures 1
and 3) and the machine will automatically stop.
ROTATION OF TURRET.
The means by which the step by step rotation is given to the turret, through
quarter of a revolution at each step, is as follows:-
A locking slide X (Figure 10) carried in a radial recess Y in the body of the
turret B has a projection Y' (Figures 3 & 10) on its outer end adapted to engage
a projection (Figure 17) on a ring Y¹ (Figures 1 and 17) encircling the turret B,
at every revolution of the cam shaft the slide X (Figure 10) is withdrawn from
engagement with the ring by a cam X, Figure 10.
The ring Y (Figures 1 and 17) encircling the turret B has four projections y
(Figure 17) and a short rack y' (Figure 3) attached to it. This ring Y' (Figures 1
and 17) is normally held away from stops y3 (Figure 3) which are part of the
frame of the machine, by the spring y, (Figure 3) which is attached to the
toothed quadrants (Figures 2 and 3), these in turn gear with the rack y'
(Figure 3) on the ring Y2 (Figures 1 and 17).

page_text: While the projection y on the ring Y (Figure 17) is normally held away from
the stops y (Figure 3), the driving clutch is in gear and the turret is revolving,
but for every quarter of a revolution of the turret the cam shaft B' (Figures 1, 2,
and 10) makes one complete revolution. As the turret has nearly completed a
quarter of a revolution, the projection Y (Figures 3 and 10) on the slide ✗
(Figure 10) engages with one of the projections (Figure 17) on the ring Y
(Figures 1 and 17) and carries forward the said ring Yagainst the stop y³ (Figure 3).
This operates the rack on the ring Y' (Figures 1 and 17) which in turn operates
the quadrants y (Figures 2 and 3) and throws the clutch (Figure 3) out of gear
thereby stopping the turret. As soon as the projection (Figures 3 and 10) on
the slide (Figure 10) is withdrawn by the cam X (Figure 10) the spring
(Figure 3) returns the toothed quadrants y² (Figures 2 and 3) and the ring Y
(Figures 1 and 17) to their normal position away from the stop y³ (Figure 3) and
the turret is free to rotate through another quarter of a revolution.
A worm wheel cut onto the turret or fastened to it, is driven by a corresponding
worm (Figure 1) by a belt on the pulley (Figures 2 and 3) on the worm
shaft (Figures 1, 2 and 3). This pulley is thrown in and out of gear by the
before mentioned clutch y.
The turret driving pulley b (Figures 2, 3 and 18) and the pulley which drives
the cam shaft B' (Figures 1 and 2) are both driven from the main countershaft Z
(Figure 18). From this countershaft Z and through a secondary series of
countershafts Z', the lathe spindle pulleys A? (Figures 1, 2, 3, 4 and 18) are
driven.
The countershaft Z has fast and loose driving pulleys, and the belt is moved
from the oue to the other by a forked lever Z2 (Figure 18) which is automatically
operated as before described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what
claim is :-
1. In a machine for making screws, pillars, studs, pinions or other small articles
a quadrantal carrier and its appurtenances constructed and arranged substantially
as described and shown whereby in the case of a screw the latter is conveyed in a
chuck on the carrier from the parting tool to the slitting saw, the chuck during its
transverse quadrantal motion bringing the head of the screw in position for the
slitting saw, while on the return of the carrier the screw is released from the
chuck, substantially as described.
2. In a machine such as described, the apparatus for driving the quadrantal
carrier substantially as described and shown.
3. In a machine such as described, the means whereby an intermittent motion is
imparted to the turret, consisting of a ring encircling the turret, such ring having
projections adapted to engage a projection on a slide arranged in the turret and
also teeth or their equivalent on a portion of its periphery whereby at every
quarter revolution of the turret, as the tools approach the rods, the projection on
the turret engages the projection on the ring and turns the latter so that it shall
operate by means of toothed quadrants or other suitable mechanism a clutch on the
driving shaft and thus throw the turret out of gear and also the means whereby
the projection on the turret is withdrawn from engagement with the ring after a
certain interval and the parts are returned to their original position to continue the
rotation of the turret, substantially as set forthı.
4. In a machine such as described the means for automatically throwing the
machine out of gear when the rods from which the screws are made are used up,
consisting of devices arranged on the turret so constructed and arranged that if
there be no rods in the lathe spindles these devices shall by means of suitable
levers throw the driving strap outo the loose pulley the said devices being held out
of gear by the rod itself if such be in the spindle.

page_text: 5. The improved apparatus or machine for making screws, studs or other small
articles taken as a whole, substantially as described and shown on the accompanying
drawing.
Dated this 31st day of May 1895.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.