Improvements in and relating to Lathes for Making Screws and other Articles.
Year: 1897

page_text: [[Communicated from abroad by FREDEREK SCHULZE of 6 Paris Street Cleveland
Ohio in the United States of America Machinist].
Improvements in and relating to Lathes for Making Screws and
other Articles.
I, CHARLES JUNGE, of Lincoln Chambers, 75 Chancery Lane, London, W.C.,
Consulting Engineer, 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 anu by the following statement:-
-
My invention relates to machines for making screws and other articles.
It will be understood that the machine shown, although called a screw machine,
may be used to make many other articles besides screws.
The machine is a turret lathe containing many novel features of construction,
which result in the automatic action, in proper sequence, of the turret slide back-
ward and forward at different rates of speed; in the several movements of the
turret itself to bring the different tools carried thereby into action; in proper
feed movement of the work; in the rotation of the live spindle in both directions
at the same or different rates of speed and in the movement of the carriage
carrying the cutting off tool. The machine also contains other novel features
of construction, which, together with the construction producing the results above
mentioned, will be hereinafter described; and the various combinations of parts
constituting the invention will be definitely pointed out in the claims.
In the drawing, Figure 1 is a front elevation of the machine; Figure 2 is a
rear elevation; Figure 3 is a plan view: Figure 4 is a sectional view on line 4-4
of Figure 3; Figure 5 is an enlarged front view partly broken away, of the
ratchet clutch constituting part of the silent feed; Figure 6 is a side view of
the middle disk shown in Figure 5; Figure 7 is a transverse sectional view of the
ratchet clutch associated with the starting handle;. Figure 8 is a sectional front
elevation in the plane indicated by line 8-8 of Figure 11; Figure 9 is a sectional
front elevation on the same plane of the right hand end of the machine,-Figures.
8 and 9 together constitute one complete sectional elevation of the machine:
Figure 10 is a left hand elevation; Figure 11 is a right end elevation when
wedge J is in engagement with disk, the upper part being sectioned on line 11-11
of Figure 1; Figure 12 is a sectional right end elevation on line 12-12 of
Figure 2, showing the mechanism for turning the turret spindle: Figure 13 is
a sectional front view of the right hand end of the machine on line 13-13 of
Figure 11; Figure 14 is a vertical transverse section showing the mechanism
for moving the tool slide; Figure 15 is a detached rear view, partly broken away,
of the bell crank lever which forms a part of said tool slide operating mechanism.
Figure 16 is a sectional view on line 16-16 of Figure 9.
Referring to the parts by letters, A represents the frame work of the machine,
whereon the various moving parts are supported in the manner presently to be
described. B represents the tubular live spindle. C represents the chuck sleeve;

page_text: and D represents the feeding tube. All of these parts are of a well known con-
struction, and they are arranged and supported, the one within the other, in the
usual manner. E represents the main driving shaft of the machine, which is
driven by means to be presently described. The various parts of the machine,
excepting only the live spindle, receive their motion, through suitable mechanism,
from the main shaft, and this mechanism is so constructed and connected with
the main driving shaft that one revolution of said shaft causes a complete cycle
of all the movements of the other parts.
Supported upon the live spindle are three pulleys, of which the pulley b is
keyed to the spindle, the pulley 61 is loose upon the spindle, and the pulley be is
keyed to a sleeve 63 which is loose on the spindle. A belt, (which is not shown)
is moved from one of these pulleys to the other by means of a belt shipper lever 64,
which is pivoted to a fixed bracket a. The lower end of this belt shipper lever
is V-shaped, or in other words, it has the cam surfaces 65 66 on opposite sides of
its said end. Adjustably secured upon the main shaft are two arms es e, which
are adapted to engage respectively with the said cam surfaces as the shaft revolves,
and thereby rock the lever and ship the belt from the pulley b to the pulley 62 and
back again, during each complete revolution of the main shaft. When the belt is
running on the pulley 63, the spindle is revolved in the direction for cutting the
stock, through a train of gears, which reduces the speed of the spindle. This
train of gears consists of the gear 67, which is formed on the end of the sleeve b³,
and a gear fl which meshes with the gear 67, and is itself fast upon a short rotatable
shaft f, which shaft has also fast upon it a gear f². This shaft f is journalled in a
rocker arm F which is hung loosely upon the spindle B, and extends to both sides
thereof. In the ends of this arm are the curved slots f³, f, which are concentric
with the spindle, and the bolts f5 pass through these slots respectively, and engage
with a fixed part a¹ of the frame. The gear f meshes with an idler gear f6, which
is mounted on a stud f which is secured to the inner face of the part a¹ of the
frame. This idler gear meshes with a gear 68 which is keyed to the spindle. The
motion of the pulley 63 is transmitted through these gears 67, f, f³, f, and 68 to
the shaft, revolving it in the reverse direction to that in which it revolves when
the belt is running on pulley b, and at a much lower rate of speed. When the belt
is running on the pulley b, this pulley and the live spindle are being revolved
in the reverse direction at the same rate of speed as the belt is moving. The rate
of revolution of the spindle when revolving in the reverse direction relative to
the speed when revolving in the cutting direction, may be changed by first
removing the gear f³, and substituting a larger or smaller gear therefor, and by
adjusting the rocker arm F around the spindle until the said gear meshes properly
with the idler gear f
The chuck sleeve C is moved back and forth in the spindle to grasp and release
the work by means of the levers c, which are pivoted to a collar cl fast on the
spindle; and these levers are operated by a cone c², which is movable longitudinally
on the spindle, these parts being substantially the same as the mechanism here-
tofore in common use for the purpose of operating similar chucks. This cone
is moved back and forth by means of fork arms c³ secured upon a sleeve c', which
is longitudinally movable upon a stud a³ secured to the frame work a¹. A pin c³,
which is secured to this sleeve, enters a cam groove e in the segment shaped face
of the work arm c7 of a three-armed lever which is loosely pivoted on a stud a³.
The two power arms c³ ³ of this lever, lie on opposite sides of the main shaft. E
at prints where the friction rollers clo, cl, mounted in the ends of the lever
arms will be struck respectively by the cam plates el 2, which are adjustably
secured to opposite faces of the disk e³, which is secured to said main shaft.
The feed tube D is moved forward for the purpose of feeding the stock, and
backward to its original place in readiness for another feed movement, by means
of a grooved collar d secured to the end of the feed tube, a fork lever di pivoted
to the end of the stud as, and the cam plates which are secured to the face
of the drum.d, which is in turn secured to the main shaft E,

page_text: G represents the turret which is secured to the end of a spindle g. This
spindle is mounted in the turret slide g¹, which slide is mounted in guides in a
cradle which is secured upon the bed plate of the machine in the usual manner.
The tail end of the turret spindle is siidable through the sleeve 9, which is
mounted on a fixed standard at. In the face of the turret there may be as many
sockets go for holding tools as desired; and the machine will be organized so that
the complete revolution of the turret will be effected by as many independent
movements as there are sockets. In the present case, four of these sockets are
formed in the turret. When the turret slide is drawn back, the turret is turned
to bring the tools carried in these sockets into position to act upon the stock, by
the following mechanism. Secured to the turret spindle is a ratchet wheel g
which may have any suitable construction. Adjacent to it is a disk g' which is
fast on a sleeve g. On the extreme end of this sleeve is a disk go, having a
crank pin g, upon which is pivoted the upper end of a bent connecting rod glo,
the lower end of which is pivoted to a lever g". This lever is pivoted to a fixed
part of the frame work, and it is normally drawn down by the spring g¹² into contact
with the face of the disk H, which is secured to the main shaft E. Adjustable
cam blocks h corresponding in number to the number of sockets in the turret, (in
the present case, four), are secured to this disk, and they are adapted to severally
engage with a friction roller 13 on the lever, thereby rocking the lever upwards
upon its pivot, with the result of rotating the sleeve gone quarter of a revolution.
This movement is transmitted to the ratchet wheel g6 by means of a pawl g",
which is carried by the disk g².
In the particular construction of these parts shown, the pawl g¹ is pivoted
in a socket in disk g'. The pawl may swing entirely into this socket, or it may
project at right angles therefrom, as shown in the drawing. The teeth of the
ratchet wheel 6 are four pins g15, which project horizontally toward the disk g²,
and into position to be engaged by said pawl g. When the disk g' is being
revolved in one direction, the pawl engaging with one of said pins is forced back
into the socket in disk g'. When it has passed said pin, it falls out behind said
pins g, and when the disk g' moves in the reverse direction, the pawl engages
with said pin and moves the ratchet g with it.
The turret slide is moved toward and from the work by mechanism to be
present.y explained. Novel means are provided, however, for locking the turret
in its different working positions. The turret is locked by means of a disk g¹6,
having in its edge as many radial tapered slots g17 as there are tool sockets in the
turret. A fixed, but adjustable wedge block J is adapted to enter one of these
slots when the turret is moved forward, that is, toward the work. This wedge
block is tapered so as to fit the tapered slots; its lower surface is inclined and
rests upon the oppositely inclined top of a block j. A bolt which passes through
the bed plate of the machine and through a slot in this block j, screws into the
wedge block J, and holds these parts down upon each other and upon the bed
plate. The position of the block j is adjusted by means of two screw bolts, one
of which, indicated by j¹, screws through a fixed bracket as against the end of the
block j, while the other, , passes loosely through said bracket and screws into
said block j. By the movement of this block j, the position of the wedge block J
may be accurately adjusted so that it will tightly fit the slots in the disk g¹6, and
thereby hold the turret absolutely immovable as to motion upon its axis. When
the turret slide has been moved back far enough, the said disk g¹ is discon-
nected from the wedge block J, and the turret may be turned. But soon after the
turret slide begins its forward movement, the described engagement of the wedge
block in said slots in said disc takes place. It is believed that this is a far more
effective mechanism for holding the turret firmly in position while the cutting
is going on than any of the mechanisms heretofore employed for the purpose.
The forward and backward movement of the turret slide is accomplished by the
following mechanism. A stud 918 which screws into the turret slide, passes through
slots in the cradle and the bed plate; and it is provided with a collar " which

page_text: bears against the under side of the bed plate. A roller 90 on the lower end of
this stud, enters a circumferential groove in a drum k, which is loosely mounted
on the supplemental shaft K, which is parallel with the main driving shaft E.
This drum is caused to revolve with the shaft, but is permitted to move longitu-
dinally thereon by means of a disk which is keyed to the shaft, and the pins
which are driven into this disk, and pass loosely through holes in the hub of the
drum k. This drum is moved longitudinally upon the shaft K, thereby effecting
the forward and backward movements of the turret slide by the following
mechanism. The sliding rod M is mounted in fixed brackets 8 aº; and it is
parallel with the main driving shaft. Projecting laterally from it is a pin m³,
which pin is adapted to be engaged by two cam plates, which are secured
upon the face of the drum k. These cam plates have their spiral edges which
engage with a roller m³ on this pin, laid in opposite directions, wherefore, it is
clear that if the rod is prevented from moving longitudinally, the engagement
of these spiral cams with said roller will cause the drum to slide longitudinally
upon the shaft K. The longitudinal movement of this rod. M is limited, first, by
the engagement of a fixed collar m' with the fixed bracket a⁹ in which the
rod slides. Its movement in the other direction is limited by the engagement
of a friction roller m³ mounted upon a pin m³, which projects laterally from the
rod, with the dogs n which are adjustably secured upon the face of the drum N
which is secured to the main driving shaft E. By means of these adjustable
dogs n, the length of the movement of the turret slide may be varied for every
tool in the turret. For example, to shorten the length of any movement of the
turret slide, one of these dogs n may be moved on the face of the drum N toward
the turret end of the machine. This permits the rod to slide in its bearings a
short distance in either direction, but only until either the collar m¹ engages the
fixed bearing a³, or the roller m³ engages the face of the said dog n.
These dogs n
are each slotted and are secured upon the face of the drum by screws n'. Their
position is adjusted by means of the screws n² which screw through the flange n³
on drum N. During this longitudinal movement of the. rod, the turret slide
remains stationary. It is only when the movement of this rod M in one direction
or the other is checked that the turret slide is caused to move. In the rotation of
the drum, one of the cams or ³, as the case may be, strikes the roller m³, and
first moves the rod until the collar m¹ strikes the frame work of the machine,
or until the roller m³ strikes one of the dogs n. In the subsequent rotation of the
drum, it is drawn longitudinally on the shaft with the result of moving the turret
toward or from the work, as the case may be.
When the stock has been fed forward by the mechanism heretofore described,
the end of said stock O strikes a stop 92, which may be carried in one of the tool
sockets in the turret. Or rather, to be more exact in the manner of stating
this operation, the stock is fed forward, and then, before the chuck is closed, the
turret is fed toward the stock, the end of the stop in the turret striking the
end of the stock, and, if necessary, pushing said stock backward, and holding it
against further outward movement until the chuck is closed.
To save as much time as possible, all the motions not used for cutting are
performed considerably faster than those that are used for cutting. This alternate
slow and fast motion is attained by the use of a train of gears and a silent feed
so-called. Mounted loosely upon the main driving shaft side by side are two
pulleys ees. The pulley es has rigidly connected with it a gear e and a pinion e¹.
Adjacent to these gears is a gear e", which is keyed or otherwise rigidly secured
to the main driving shaft E. Keyed to the shaft K are the two gears, which
mesh respectively with the gears elo, ell. For the fast motion of the driving shaft
and the various parts which are driven thereby, the power is transmitted from the
pulleys, through the gears elo, ell, k, k, to the driving shaft K. For the slow
motion, the belt is shipped to the pulley e
The slow movement is secured through what is known as the silent feed, which,
in the novel form shown, is constructed, connected, and operated as follows.

page_text: R represents a disk formed upon or secured to a sleeve r, which is loosely
mounted on the shaft K. A pinion rigid with said sleeve, meshes with the
gear e. Loosely mounted on the sleeve r on opposite sides of the disk R, against
which they are held by nuts, are the two disks ³, r. In each face of the
disk R are two cam-shaped recesses, in which are placed the rollers 6. Sand
rollers are held in by the two disks, When either disk ³ is moved in
one direction upon its axis, the rollers which are under the influence of
soring, wedge themselves between said disk and the faces of the cam-shaped
recesses, thereby causing disk R to move with it. When either disk 703 pris
rocked in the opposite direction, it moves alone, the rollers dropping back into
the cam recesses. These disks act alternately in the manner described,―the
result being a slow, but practically continuous movement of the disk R in one
direction. The cam-shaped recesses and rollers constitute one form of a ratchet
clutch, and any other form of ratchet clutch might be substituted.
These two disks are rocked back and forth upon sleever by means of two
links 8, which are pivoted on the same pin s to a lever S, said lever being
pivoted to the frame of the machine. These two links are respectively connected
at their other ends with crank pins 10 l on the disks. This lever S is
operated by a ram bar T, having a longitudinal slot t, which embraces a fixed
sleeve as, which embraces the shaft E. A fixed piu a passes through a parallel
slot t, and consequently, the ram bar is compelled to follow a path transverse
to the axis of the shaft E, being guided therein by the said slots t, t¹, and the
sleeve as, and the pin a³.
Projecting laterally from this ram bar are two pins 2 and 3, bearing respec-
tively the friction rollers tt, which rollers bear against the opposite edges of
an eccentric disk Q, which is carried by the pulley e. This disk causes the ram
bar to be moved longitudinally backward and forward, the length of this movement
being proportionate to the eccentricity of the said disk Q. This movement of
the ram bar operates the lever S, with the result of oscillating the disks ok ;
and this movement of these disks produces, as before described, the slow but
practically continuous movement of the disk R in one direction. This movement
of said disk is transmitted to the main driving shaft, through sleeve r, pinion r³,
gear e, and the train of gears elo, ell, k, k before described.
The eccentric disk Q is connected with the pulley e, and its eccentricity is
varied by the following construction and combination of parts.
The pulley e has rigidly secured to or formed upon its outer side, a disk e¹³,
to the side of which the eccentric disk Q is connected by means of the screws e¹³
which project from disk e¹2 into two slots q in the eccentric disk on opposite sides
of its center. This eccentric disk Q is held in the desired position relative to the
shaft, and is moved to change its eccentricity by means of the following mechanism.
A conical wedge V is slidable upon the shaft E within a tapered eccentric
opening q in disk Q, the inner edges of this disk engaging with said wedge as
shown in Figure 13. As shown in this figure, the disk is in its least eccentric
position. The movement of said wedge V toward the pulley e moves the cam
disk to increase its eccentricity, while the subsequent reverse movement of said
double wedge permits the opposite movement of said eccentric disk. This latter move-
ment is effected positively by a reverse cone ₁, integral with the cone V, which
reverse cone engages with a block 92 secured to the inner side of the eccentric
disk Q.
In machines of this character, the speed of the mechanism should vary as the
work being done is heavy or light. The speed of the silent feed is, as before
explained, proportionate to the eccentricity of the disk Q. The cone V is moved
automatically at the proper times to change the eccentricity of this disk by means
of a lever W which is pivoted to a fixed bracket all, and bears against the end of
the cone V; a rod w which is pivotally connected with said lever W, and is
longitudinally movable in the frame; and the adjustable dog which is secured
to a drum X on shaft E. This dog may be positioned so as to cause any desired

page_text: There
movement of the lever W, and at any desired time, and it may be shaped to hold
said lever in the position to which it is thereby moved for any period.
may be as many of these dogs as are necessary to effect the desired number of
changes in speed.
The belt, (not shown) for driving the pulleys e, es, are automatically shipped
from one pulley to the other by means of a belt shipper lever Y. This belt shipper
lever is moved by a longitudinally movable bar y, having a slot which receives
a pin yon said lever. This bar is moved in one direction by a spring y³, and
is moved in the opposite direction by dogs i, which are secured to a disk I on the
main shaft E. These dogs engage with a laterally projecting arm y, which is
secured to or formed integral with the bar y. The end of this arm with which
the dogs first engage, is bevelled as shown in Figures 3 and 11, whereby the
engagement between the said dogs and face of this arm is affected. The inner
edge of this arm as shown in Figure 11, is eccentric to the path of the dog, being
nearest at the end thereof with which the dog first contacts, and, when the dogs
leave contact with this bar, they slide off of such inner edge. The dogs themselves
are the round heads of radially adjustable screws which screw into the clamps
which are fastened to the disk 1. The further the head of this screw is from the axis
of the shaft, the longer will the contact between it and the arm y' be maintained.
The cut-off slide P is mounted on the bed plate of the machine. A pin p
projects from one side of this slide, and enters a cam groove U¹ in the segment-
shaped end of a rocker U, which is pivoted on the fixed stud a".
represents a bell crank lever pivoted on the same stud. In its approximately
horizontal arm is a concentrically curved slot u¹, into which projects a pin U³
which is rigid with the rocker U. Two adjustment screws screw into this
horizontal arm of the bell crank lever, entering the ends of said curved slot on
opposite sides of said pin U². By the manipulation of these screws, the position
of this pin within the slot may be adjusted. The approximately vertical arm of
this bell crank lever has a laterally projecting pin u, which is adapted to be
engaged by oppositely inclined spiral cam strips e, which are secured upon the
face of a drum e which is secured to the main driving shaft E. These can
strips while spiral in form at one end, whereby the tool slide may be moved, are
straight at and near the other end, whereby the tool slide will be held for the
proper length of time in the position to which it has been moved. The distance
which the tool slide shall travel may be shortened, and otherwise changed, by
loosening one or the other of the adjustment screws ³, so that the bell crank
lever may have a greater or less movement, before the ends of said screws engage
with the pin, and cause the segment bar to move.
Z represents a handle which may be used for slowly moving the machine, and
it is principally useful in setting the machine for a new job. This handle has a
ring which embraces a disk 22, which is secured to the shaft K. In the face
of this disk two cam-shaped notches are cut, and in these notches lie the
rollers **. Collars secured to this shaft, hold the ring in the described position,
and prevent the escape of the rollers. In the movement of the handle in one
direction, these rollers wedge themselves between the cam faces on the disk z² and
the ring ¹, whereby the shaft is caused to turn. The handle is moved in the
other direction without causing any motion of said shaft. The construction
described is generally a ratchet clutch which connects the handle and the shaft.
The specific form of this ratchet clutch shown is not new, but it is believed that
the combination with one of the shafts of a screw machine of an oscillating handle
and a ratchet clutch for connecting said shaft and handle, is new.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1 In a screw machine. in combination, the live spindle, a pulley tight thereon.

page_text: a pulley loose thereon,, a gear tight to said loose pulley, a gear tight to the spindle,
a rocker pivoted concentrically with said spindle, means for fixing its position,
connected gears mounted on said rocker, and an idler gear whereby motion is
transmitted from one gear on the spindle to the other, and a belt shipper, sub-
stantially as and for the purpose specified.
2. In a screw machine, in combination, the live spindle, a pulley loose thereon,
a gear tight to said pulley, a gear tight to the spindle, a rocker hung upon said
spindle, and means for securing it in fixed position, a shaft mounted thereon,
two gears tight to said shaft, and an idler gear, substantially as and for the
purpose specified.
3. In a screw machine, in combination, the live spindle, a tight pulley thereon,
a loose pulley thereon, means for transmitting motion from the loose pulley to
the spindle, a belt shipper lever having on one arm two cam surfaces, the driving
shaft, and two arms adjustably secured thereto for engagement with the said cam
surfaces, substantially as and for the purpose specified.
4. In a screw machine, the described means for operating the cone which actuates
the chuck, consisting of the following parts in combination, the fork lever movable
longitudinally with respect to the live spindle, an operating pin secured thereto,
a three arm lever having on the segment-shaped end of the work arm spiral cams
for engagement with said operating pin, a rotating disk, and adjustable cams
secured thereto, which engage with and alternately operate the two work arms of
said lever, substantially as and for the purpose specified.
5. In a screw machine, in combination, the tubular live spindle, tubular chuck,
levers for operating the chuck, a cone for actuating said levers, a sliding sleeve
having a fork for moving said cone and an operating pin, a pivoted lever having
two power arms and a segment-shaped work arm, cams upon the end of this work
arm for engagement with said operating pin, and cams for engaging said power
arms alternately, substantially as and for the purpose specified.
6. In a screw machine, the means substantially as described for moving the
tool slide, consisting of a segment-shaped rocker pivoted to a fixed stud, cams on
its surface, a pin projecting from the tool slide into engagement with said cams,
an operating lever pivoted on the same stud, rotating cams for engaging with one
arm of said lever, and means for adjustably connecting said segment-shaped arm
and the operating lever, substantially as and for the purpose specified.
7. In a screw machine, the means substantially as described for moving the
tool slide, consisting of a rocker having a segment-shaped end, cams thereon
engaging a pin on the tool slide, a bell crank operating lever having in one arm
a curved slot, adjustment screws which enter the ends of this slot, a pin on the
rocker which enters this slot between said screws, and rotating cams engaging
with the other arm of the bell crank lever, substantially as and for the purpose
specified.
8. In a screw machine, in combination, the turret slide, a stud secured thereto,
the main shaft, a secondary shaft, a suitable connecting mechanism, a drum
longitudinally movable upon said secondary shaft having cams on its surface,
said drum also having a circumferential groove in which said stud engages, a
longitudinal sliding bar having a projection which engages with said surface
cams, and having also a stop collar and a second projection, a drum secured to
the main shaft, adjustable dogs thereon adapted to engage with the last named
projection on said bar, substantially as and for the purpose specified.
9. In a screw machine, in combination, the turret slide, the main shaft, a
secondary shaft driven therefrom, a disk secured to said secondary shaft, a drum
Icorely mounted on said shaft, pins parallel with the shaft secured to said disk
passing loosely through holes in the hub of said drum, cams secured to the face
of said drum, a sliding rod having a projection adapted to engage with said
cams, a stop collar on said rod, a second projection on said rod, a drum secured
to the main shaft, adjustable dogs secured to the surface of said drum, and a

page_text: stud secured to the turret slide entering a circumferential groove in the drum
first named, substantially as and for the purpose specified.
10. In a screw machine, in combination, the main shaft, two pulleys loosely
mounted thereon, a secondary shaft, gears transmitting motion from one of said
pulleys through the secondary shaft to the main shaft, a silent feed mounted on
the secondary shaft, mechanism intermediate of the other loose pulley and said
silent feed, gears transmitting motion from said silent feed to the first named
loose pulley, substantially as and for the purpose specified.
11. In a screw machine, in combination, the main shaft, two pulleys loosely
mounted thereon, two gears fast to one of the said loose pulleys, a gear fast upon
the main shaft, two gears fast on the secondary shaft in mesh, as described,
whereby motion is transmitted from said loose pulley to the main shaft, a sleeve
loose upon the secondary shaft, a gear fast thereto in mesh with one of the gears
secured to said loose pulley, a silent feed on said sleeve, and mechanism inter-
mediate of the other loose pulley and silent feed, substantially as and for the
purpose specified.
12. In a screw machine, in combination, the main shaft, a pulley loosely mounted
thereon, an eccentric disk rotating with said pulley, a ram bar operated by said
eccentric disk, a lever operated by said ram bar, a secondary shaft, a silent feed
mounted thereon, mechanism intermediate of said lever and silent feed whereby
the latter is operated, and a train of gears transmitting motion from said silent
feed to the main shaft, substantially as and for the purpose specified.
13. In a screw machine, in combination, the main shaft), a pulley loosely
mounted thereon, an eccentric disk rotating with said pulley, means for varving
the eccentricity of said disk, a ram bar engaging said disk, a lever operated by
said ram bar, a silent feed operated by said lever, and a train of gears trans-
mitting motion from said silent feed to the main shaft, substantially as and for
the purpose specified.
14. In a screw machine, in combination, the main shaft, a pulley loosely
mounted thereon, a transversely movable eccentric disk connected with said pulley
and having an eccentric hole, a cone longitudinally movable upon the main shaft
within the disk and in engagement therewith, mechanism operated by said eccen-
tric disk whereby the main shaft is rotated, a lever for moving said cone, and
adjustable cams for operating said lever, substantially as and for the purpose
specified.
15. In a screw machine, in combination, the main shaft, a pulley loosely
mounted thereon, an eccentric disk rotating with the pulley, a ram bar operated
by said disk, a lever operated by said ram bar, a sleeve mounted on the secondary
shaft, a disk rotating with said sleeve, mechanism for transmitting motion from
the sleeve to the main shaft, two oscillating disks mounted axially with respect
to said sleeve, clutching devices for alternately connecting said two disks with
the disk which is fast to said sleeve, and two links respectively connecting these
two disks with said lever, substantially as and for the purpose specified.
16. In a screw machine, in combination, the main shaft, two pulleys loosely
mounted thereon, mechanisms for transmitting motion at different speeds from
said pulleys respectively to the shaft, a belt shipper lever, a longitudinally movable
bar for operating said lever, a spring for moving said bar in one direction, a
rotating disk, dogs adjustably secured thereon, and a plate having a bevelled end
secured to said bar, substantially as and for the purpose specified.
17. In a screw machine, in combination, a belt shipper lever, a longitudinally
movable bar, a spring, an eccentrically curved plate on the end of said bar, a
rotating disk, radially adjustable dogs secured thereto for engagement with said
plate, substantially as and for the purpose specified.
18. In a screw machine, in combination, the turret slide, the turret spindle
mounted therein, and a ratchet secured to said turret spindle with an oscillating
sleeve mounted in the fixed support concentric with said turret spindle, pawl
a

page_text: carried thereby, a connecting rod pivoted on a crank pin secured to said sleeve,
a pivoted lever to which the other end of said connecting rod is pivoted, a
rotating disk, and cams secured thereto for operating said lever, substantially
as and for the purpose specified.
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