Year: 1898

page_text: I, WILLIAM SIMEON DAVENPORT, of the City and County of Providence, and
State of Rhode Island, United States of America, Mechanical Engineer, do hereby
declare the nature of this invention, and what manner the same is to be per-
formed, to be particularly described and ascertained, in and by the following
| statement:-
-
The present improvements relate to screw machines and more especially to
that class of screw machines in which a rod of stock is intermittently fed forward
for the prescribed distance.to form an article and is held by the jaws of a revolv-
ing chuck, and successively acted on by a series of tools carried by a tool holder.
One feature of invention relates to means for reducing to a minimum the time
which elapses between the operation of successive tools, and consists in providing
two independent mechanisms for effecting the reciprocation of the support which
carries the series of tools, which support preferably consists of a turret mounted
on a turret slide, one of said mechanisms acting to slowly advance the support
during the cutting, and the other mechanism acting to quickly return the sup-
port to its rearward position. In case the machine is forming short articles, the
support must be advanced some distance before the tools begin to act upon the
stock, and it is therefore preferred to so construct the mechanism for rapidly
returning the support that it may also bring the tools up to the work. With
such a construction the support may be returned, indexed, and again advanced to
bring the succeeding tool up to the work, while the slow running mechanism is
moving into position to again feed forward the support, and the rapidity of the
operation and efficiency of the machine thus increased.
Further features of invention relate to the indexing mechanism, the mechanism
for reversing the chuck spindle, the mechanism for feeding the stock, and other
combinations and constructions which will be more fully set forth hereinafter
and specified in the claims.
In the accompanying drawings in which is illustrated a screw machine embody-
ing the present improvements in their preferred form
Fig. 1 is a front elevation.
Tio 2 ion rear elevation

page_text: Fig. 4 is a horizontal sectional view with the back and front shaft removed.
Fig. 5 is a transverse sectional view.
Fig. 6 is a detail plan view of the turret slide and the parts carried thereby.
Fig. 7 is a detail sectional elevation of the same.
Figures 8, 9, and 10 are longitudinal sectional views of the same showing the
parts in different positions.
Figure 11 is an end view of the turret slide.
The jaws of the chuck are carried by the spindle 1 and are operated by a sleeve 2
which is engaged by the ends of levers 4 which fulcrum upon a sleeve 5 secured
to the spindle 1. The levers 4 are operated by a sliding sleeve 6, and said sleeve
is operated by a lever 7 pivoted at 8 and provided with a yoke at its upper end,
the arms of which are pivoted to a collar 9 mounted in a groove in said sleeve 6.
The lower end of lever carries a roll which is engaged by a cam 10 secured
to a cam shaft 11 which is revolved at the proper times to open and close the
jaws of the gripper.
The stock is fed forward by means of the feeding tube 12 which is provided with
the usual spring fingers for engaging the stock, and which is reciprocated at the
proper time by mechanism actuated from a cam 13 secured to the cam shaft 11.
This mechanism which forms a feature of the present invention is so constructed
that the amount of stock fed may be varied without producing lost motion in
the connections, with the result that a more accurate and more efficient feed
of the stock is effected. In the embodiment of this feature of invention shown in
the drawings a lever 14 is pivoted at 151 and is given a definite throw by the
cam 13 which acts upon a roll on the end of said lever. The lever 14 is provided
with a groove in its upper end which is engaged by a stud 15 adjustably mounted
on a slide 16. The slide 16 is guided upon suitable ways 17 formed on the
bracket 18 and is connected with the feed tube 12 by means of a pivoted arm 1.9
which fits in a groove in the collar 20 loosely mounted between shoulders 21 on
the feed tube. The stud 15 is formed on a nut 22 which is engaged by a screw
rod 23 on the slide 16 and is guided in a groove 24 formed in said slide. A
handle 25 may be placed on the squared end of the rod 23 and said rod turned
to adjust the stud 15 to and from the pivot of the lever 14 and thus vary the
distance through which the slide and feeding tube are moved by the oscillation
of the lever. The grooves in the slide and lever are so arranged that they are
parallel when the lever is at the forward limit of its throw so that the end of the
feeding tube moves up to the same point without regard to the. amount of stock
fed.
The various mechanisms of the machine with the exception of the spindle are
driven from a shaft 26 mounted in bearings 27 secured to the back of the frame
and connected to a short shaft 28 by means of a clutch 29. The shaft 28 is
mounted in the bracket 30 and carries a band pulley 31 at its outer end to which
power may be applied. One member of the clutch 29 is secured to the shaft 28
and the other member 32 is keyed to slide upon the end of shaft 26. The clutch
member 32 may be shifted to stop the operation of the automatic mechanism by
means of a yoke 33, the arms of which are pivoted to a ring on said member,
said yoke being secured to a shaft 34 extending transversely of the machine and
provided with a handle 35 at its front end. The handle 35 carries a spring pressed
pin 36 which engages notches in a plate 37 and serves to hold the clutch member 32
in or out of engagement.
The spindle is rotated in either direction by means of two oppositely running
pulleys 38 and 39 loosely mounted on said spindle and which may be alternately
connected to the spindle by means of a clutch operated by the sleeve 40 in any
well-known manner. The sleeve 40 is shifted to connect either the pulley 38
or 39 to the shaft by means of a lever 41 which is provided with a yoke at its
upper end, the arms of which are pivoted to the ring 42 loosely mounted in a
groove in said sleeve. The shifter lever 41 is operated in each direction by a
cam 43 which is revolved a half revolution at suitable intervals to shift the

page_text: sleeve 40 first in one direction and then in the other, and thus reverse the direction
of rotation of the spindle. The cam 43 is driven from the driving shaft 26 by
the following mechanism: A clutch member 44 is secured to the shaft 26 and
is engaged at intervals by a clutch member 45 connected to the cam 43, said clutch
members cooperating to form a driver for said cam. A sleeve or bushing 46
surrounds the shaft 20 between the clutch member 44 and the bearing 27 and
the clutch member 45 is loosely mounted on this sleeve. The clutch member 45
is provided with a hub 47 which extends within the cam 43 and to which the
cam is keyed so that said cam will be revolved with said clutch member while
allowing a longitudinal movement thereof. A spring 48 is interposed between
the end of the hub 47 and a shoulder on the sleeve 46 and tends to force the
clutch member 45 into engagement with clutch member 44. The clutch member 45
is normally held out of engagement by one or the other of two abutments 49,50
which engage one or the other of cams 51 and 52 formed on the said clutch member,
said cams being located on diametrically opposite sides of the clutch member.
The abutments 49 and 50 are in the form of pins on the ends of levers 53 and 54
which extend transversely of the machine and are operated at the proper times
by means of tappets 53' and 541 adjustably secured in undercut grooves formed
in a disc 551 secured to a shaft 56' at the front of the machine. The arms 53
and 54 are provided with plates 57 and 58' against which the tappets act, and
said arms are also provided with handles on their ends whereby they may be
tripped by hand if desired. With the parts in the position shown in Fig. 2
the clutch member 45 is held out of engagement by the abutment 49 which
engages the cam 51. When the lever 54 is rocked the member 45 is released
and the spring 48 forces the said member into engagement with the revolving
member 44 and the cam 43 is revolved until the cam 52 engages the abutment 50
when the clutch member 45 is again thrown out of engagement and held until
the arm 53 is rocked and the clutch member again released. The levers 53 and 54
are returned immediately after being rocked by springs 55 and the pins ride on the
periphery of the clutch member until engaged by the cams. A pin 56 on the
end of a spring pressed arm 57 engages notches in the periphery of the clutch
member 45 and prevents overrunning of the cam 43 and holds the cam in position.
While it is preferred to employ two abutments as with such a construction the
clutch may be run at a higher rate of speed and the rotation of the spindle be reversed
in more rapid succession, yet it will be understood that a single abutment may
be used if desired, in which case the cams 51 and 52 will both be arranged to
engage said abutment.
The cam shaft 11 is revolved a single revolution at the proper time to open
and close the chuck jaws and to feed forward a new length of stock by the follow-
ing mechanism: A collar 58 secured to the shaft 26 is provided with a clutch
face 59 arranged to be engaged by a clutch member 60 keyed to slide upon a
sleevo 61 which extends through the bearing 27 and has a gear 62 secured to
its end. The gear 62 meshes with a similar gear 63 secured to the cam shaft 11.
A spring 64 is interposed between a shoulder on the sleeve 61 and a shoulder on
the clutch member 60 and tends to force said member into engagement with the
clutch face 59. The clutch member 60 is held out of engagement by means of an
abutment 65 which engages a cam 66 formed on the said clutch member. The
abutment 65 is in the form of a pin on the end of a lever 67 extending transversely
of the machine and rocked against the action of spring (8 at the proper time by
means of one or more tappets (71 adjustably secured in an undercut groove formed
in a disc 68 secured to a shaft 691 mounted in bearings at the front of the
machine. The arm 67 is provided with a plate 701 which is engaged by the
tappet 67 and said arm is also provided with a handle whereby it may be operated
by hand. When the lever 67 is rocked the clutch member 60 engages the clutch
face 59 and said member is revolved one revolution when the cam 66 engages
tho abutment 65 and disengages the clutch member. A pin on the end of a

page_text: spring pressed arm 69 engages a notch in the periphery of clutch member 60O
and prevents overrunning of the clutch member and parts driven thereby.
A turret 70 is secured to a shaft 71 mounted in a turret slide 72 and forms a
support for a series of tools for acting upon the stock carried by the spindle. The
turret is indexed, that is to say, is moved to bring the tools successively into
position to act on the stock by mechanism carried by the turret slide, which in-
dexing mechanism is driven intermittently by mechanism mounted on the frame
and connected with the indexing mechanism by gearing which does not interfere
with the reciprocation of the slide. The indexing mechanism consists of a disc 73
connected with the turret, preferably by being secured to the shaft 71, and pro-
vided with radial slots 73' arranged to be engaged by a crank 74 also mounted
on the turret slide. The crank 74 is carried by a disc secured to a shaft 75
journaled in the slide 72 and having a spiral gear 76 secured thereto, which gear
is engaged by a spiral gear 77 secured to a shaft 78 extending longitudinally of
the slide 72. A gear 79 is secured to the shaft 78 and is engaged by a gear 80
mounted on the frame of the machine, the gear 79 being of such length that
the slide 72 may be reciprocated without disengaging the said gear and gear 80.
The gear 80 is engaged by a gear 81 loosely mounted on the shaft 20. The
gear 81 is intermittently revolved by a clutch member 82 which is secured thereto,
or formed integral therewith and is normally held out of engagement with a
clutch face 83 on the collar 58 by an abutment 84 which engages a cam 85 on
said clutch member. The clutch member is forced towards the collar 58 by a
spring 86 interposed between a shoulder 87 on the shaft 26 and the end of a
recess formed in a sleeve 88 which bears against the hub of gear 81. The
abutment 84 is in the form of a pin in the end of a lever 89 which extends trans-
versely of the machine and is rocked at the proper time by means of a series of
tappets 891 (one only of which is shown adjustably secured in an undercut groove
in a disc 90' secured to the shaft 691). The arm 89 is provided with a plate 911
engaged by the tappets 891 and with a handle whereby said arm may be rocked
by hand. When the lever 89 is rocked the clutch member is revolved a single
revolution and then thrown out as above described with reference to clutch
member 60. A pin 90 on the end of a spring pressed lever 91 engages a notch
in the periphery of the clutch member 82 and prevents said member overrunning.
When the clutch member 82 is revolved it acts through the gearing described
to rotate the shaft 75 a single revolution, and causes the crank 74 to engage one
of the slots 73 and move the turret head a partial revolution. The slots 731 in
the disc 73 are so arranged that the crank will enter and leave said slots while
moving radially of the disc 73 and the turret will thus be gradually started and
stopped and may be indexed quickly without any jar either in starting or stopping.
Moreover with this construction of indexing mechanism the turret may remain
locked until the crank enters a slot 731 and may be again locked just before the
crank leaves the slot and thus accuracy of indexing may be insured since the
turret is positively held at all times. By mounting the indexing mechanism on
the turret slide and driving said mechanism from a driver on the frame, which
is always connected with said indexing mechanism, it is not necessary to move
the slide into any fixed position to effect the indexing, but said indexing may
take place with the slide in any position, or while the slide is moving in either
direction.
The turret is locked in position by a spring pressed locking bolt 92 which en-
gages recesses formed in said turret. The bolt 92 is withdrawn just after the
crank 74 enters one of the slots 731 and released just before said crank leaves said
slot by means of a cam 93 secured to the end of shaft 78, which cam acts upon
the end of a lever 94 engaging said bolt.
As shown in the drawings the turret is constructed to carry five tools and in
case five tools are used five tappets 891 will be used and the turret slide will be
advanced after each indexing. In case a fewer number of tools are used, it is
desirable that the turret should be indexed two or more times in rapid succession

page_text: after it has been returned and before the next cutting operation takes place. This
may be accomplished by placing two or more of the tappets 89' close to each other
so that the abutment 84 will be tripped two more times in rapid succession, and
the driving clutch 82 will be thrown into action two or more times in rapid
succession, but it is preferred to provide means for holding or moving the abut-
ment out of operative position as the cam 85 passes said abutment so that the
driver 82 is not thrown out of action until it has revolved two or more times
according as there are four or a less number of tools being used. This feature of
the invention in its preferred form consists of a series of adjustable slides or
other suitable devices which may be moved into or out of operative position and
which when in operative position will hold the abutment 84 out of the path of
the cam 85. As shown in the drawings these devices are in the form of a series
of five pins 95 mounted to slide in the gear 80 and held in position by the set
screws 96. When adjusted to project beyond the gear these pins engage a
branch 97 of the arm 89 and hold the abutment 84 out of the path of the cam 85.
Thus the driver for the indexing mechanism may be caused to remain in engage-
ment for two or more revolutions according as one or more of the pins 95 projects
beyond the gear 80.
In machines in which the turret slide is reciprocated by means of a cam, said
cam must run at a slow speed in order that the tools may act upon the stock
properly during the cutting, and when the roll which engages the cam reaches
a high point of the cam, and the cutting operation is completed the cam must
revolve far enough to allow the roll to roll over such high point before the return
movement of the slide begins, and must then pass low enough to bring the slide
to its rearward position before the indexing can begin, and then the indexing
must take place and the tool be brought up to the work before the cutting can
begin. In such a construction there is considerable time consumed in thus return-
ing indexing and bringing the tools up to the work, especially when the machine
is forming short articles." It is therefore preferred to use a slow running cam
for advancing the turret slide during the cutting, and to provide independent
and more rapidly acting mechanism for returning the turret slide, and it is also
preferred to so construct this mechanism that it will also advance the turret slide
to bring the tools up to the work. With such a construction the turret slide is
returned, the turret indexed, and the turret slide advanced to bring the succeed-
ing tool up to the work while the roll is passing over the high point of the cam
and passing low enough to bring it into proper position to operate the turret slide
during the cutting operation, and the rapidity of operation is thereby increased.
Any suitable mechanism may be used to thus return the turret slide, but it is
preferred to use a mechanism which is carried by the turret slide, and it is aiso
preferred to drive said mechanism from the indexing mechanism.
The mechanism for reciprocating the turret slide forms a feature of the present in-
vention. The preferred form of such mechanism is shown in Figs. 6-10, and is as
follows: A disc 98 is secured upon the end of shaft 75 and a corresponding disc 99 is
secured to the end of a stud 100 mounted in a bearing 101 upon the slide 72, the
axes of said stud and shaft being in line. A crank pin 102 connects said discs and
passes through one end of a link 103 the other end of which is pivotally con-
nected to a bar or block 104 mounted to slide upon the slide 72. An abutment
or stop 105 secured to the frame is arranged to engage the end 106 of the bar 104.
A reciprocating member in the form of a U-shaped block 107 is mounted upon
the slide 72, the arms of the U extending upon opposite sides of the bar 104 and
the end of said block being engaged by the shoulder 108 upon the block 104.
The block 107 is provided with rack teeth 109 which are engaged by a segmental
gear 110 forming one arm of a lever 111 pivoted at 112 and carrying a roll 113 at
its other end. The roll 113 rides on the surface of a cam 114 being held thereon
by a spring pressed bolt 115 which engaged the lever 111.
The operation is as follows; During the cutting operation the crank 102 and
link 103 stands in the position shown in Fig. 8 and rigidly connect the bar 104

page_text: and the slide 72. The block 107 engages the shoulder 108 on the bar 104 and as
the roll 113 rides up one of the lobes of the cam 114 the block 107 acting through
said connections advances the slide 72. When the cutting is completed the
parts will stand in the position shown in Fig. 8 with the bar 104 engaging the
stop 105 and the roll 113 upon the point 116 of the cam 114. The abutment 84
will now be tripped and the shaft 75 revolved a single revolution.
As the shaft revolves into the position shown in Fig. 9 the crank 102 will act
through the link 103, bar 104, and stop 105 to draw back the slide 72 and draw
the tool off the stock. In the meantime the roll 113 will roll over the point 116
of the cam 114 and the block 107 will slowly move back away from the shoulder 108.
As the shaft 75 continues to revolve, the crank 74 will enter one of the slots 73¹
and turn the turret 70 to bring the next tool into position. At the completion of
the indexing the parts will occupy the position shown in Fig. 10. When the
crank 102 is diametrically opposite its normal position, the return of the slide 72
will have been completed, and as the crank continues to revolve the bar 104 will
be moved back away from the stop 105. During this time the roll 113 has been
passing down the incline 117 of the cam 114 and the block 107 has been moving
back. As the crank 102 completes its revolution, the roll reaches the low part
of the canf and starts up the succeeding lobe 118. In case short articles are
being formed, the backward movement of the block 107 is only a fraction of the
backward movement of the slide 72, and during the latter part of the rotation of
the crank 102 the shoulder 108 will therefore bear against the end of block 107
and the slide 72 will be advanced by the action of the crank and bar 104. When
the crank has completed its revolution, the slide 72 will have been advanced to
bring the tool 119 up to the work and said tool will then be advanced along the
stock by the action of the slow running cam 114. Thus the turret slide will be
advanced during the cutting by a slow running mechanism and will be returned
and advanced to bring the tools up to the work by a quick running mechanism
and the time required to make the changes between successive cuts reduced to a
minimum and the efficiency of the machine thereby increased. While it is pre-
ferred to mount the parts of the return mechanism upon the slide as by such an
arrangement a compact construction is provided, it will be understood that the
invention is not limited to such an arrangement, but that the parts may be other-
wise arranged if desired.
The cam 114 is secured upon the end of a shaft 120 mounted in the bearing 121,
said cam being held upon said shaft by means of a nut 122 which screws upon the
end of the shaft and clamps said cam against a disc 123. The nut 122 is provided
with a shank 124 which extends beyond the frame of the machine and is pro-
vided with a squared end to receive a wrench. A gear 125 is secured to the
shaft 120 and engaged by a gear 126 secured to a second cross shaft 127 which
carries a worm wheel 128 keyed to its end outside the frame and engaged by a
worm 129 formed on a shaft 130. The shaft 130 is driven from the shaft 26
by a series of change gears 131.
The front shaft 691 is driven from the shaft 127 by means of bevel wheels 132
and 133 secured to the shafts 127 and 691 respectively. The shaft 691 also has
secured thereto the cams 134 and 135 for operating the cross-slides 136 and 137.
These cams are mounted upon the end of shaft 691 outside its bearing so that
said cams may be readily changed. The shaft 561 is in line with shaft 69, and is
connected thereto by a coupling 138 which is arranged to slide on the shaft 561 to
allow the removal of the cams 134 and 135. The coupling 138 is provided with
projections 139 which are arranged to engage recesses 140 in a collar 141 secured
to the end of shaft 691, and said coupling is connected to the shaft 56' by means
of a spline and groove so that said coupling may be moved longitudinally of said
shaft. A pin 142 secured to a leaf spring 143 is carried by the coupling and two
recesses 144 are formed in the shaft 561 in position to be engaged by said pin, one-
of said holes being engaged by the pin when the coupling is in engagement with

page_text: e collar 141 and the other being engaged when the couping is
own in Fig. 1.
SITE
The cross-slide 136 is operated from the cam 134 by means of a lever 145 pro-
ded with gear teeth which engage a rack 146 on the cross-slide. The cross-
ide 187 is operated from the cam 135 by means of a lever 147 which engages
segmental gear 148 secured to a shaft 149, which shaft carries a second seg-
hental gear 150 which engages a rack 151 on the slide 137.
Both of the
evers 145 and 147 extend to the front of the machine and overlie their operating
ams and are provided with sockets 152 for the reception of handles for manually
perating the cross-slides.
desired to insert a new rod of stock
When the rod of stock is used up and it
he operation of the parts of the machine other than the spindle must be stopped
for this purpose, and the jaws of the chuck must be opened to receive the new
rod of stock. In the present machine means are provided for manually opening
the jaws of the chuck, and at the same time throwing the driver for the cam
shaft into engagement so that when the machine is started up the jaws of the
chuck will be closed and the feed mechanism moved into position to feed forward
The jaws of the chuck are
the stock when the cam shaft is again revolved.
manually opened by moving the lever 7 by means of a handle 1521 attached to
said lever. A cam 153 is secured to the shaft 11 and is arranged to be acted
on by the roll on the end of lever 7 when said lever is rocked to open the jaws
of the chuck. The action of this roll on the cam turns the shaft 11 slightly and
thus through the gears 62 and 63 turns the clutch member 60 far enough to carry
the cam 66 past the abutment 65 and allows said clutch member to move into
engagement with the clutch face 59. This movement of the shaft 11 also brings
the point 154 of cam 13 past the roll on the end of lever 14 so that the said lever
is free to swing forward when the rod of stock is inserted. Now when the machine
is started, the shaft 11 completes its revolution and the jaws of the chuck are
closed and the feeding tube moved back ready to feed forward a new portion of
stock.
The chips forms by the cutting tools as well as the completed articles formed
by the action of the various tools and severed from the end of the rod of stock
pass down through a chute 155 passing down through the frame of the machine
and means are provided for separating the articles from the chips which consists
5 of a deflector plate which normally stands out of the path of the chips, but which
is moved into the path of the chips just as the article is severed and deflects
Just as the article is
said article. This plate 156 is secured to the end of a lever 157 which is pivoted
at 158 and held in normal position by the spring 159.
severed the end of the lever 157 is engaged by a cam 160 adjustably secured in an
40 undercut groove 161 in the disc 68, and is swung across the path of the chips.
The articles falling down the chute 155 strikes the plate 156 and are deflected
into a receptacle placed to receive them.
The general operation of the machine will be understood from the detail des-
cription of the operation of the various parts as above set forth.
45 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-The combination of a support for a plurality of tools, of mechanism for
indexing said support, mechanism for advancing said support, and independen
50 mechanism for returning said support, substantially as described.
2-The combination of a support for a plurality of tools, of mechanism fo
indexing said support, a cam for advancing said support, and mechanism inde
pendent of said cam for returning said support, substantially as described.
3-In a screw machine, the combination with the turret slide, of mechanis
55 for advancing said slide, and independent mechanism for returning said slide
substantially as described.

page_text: 4-In a screw machine, the combination with the turret slide, of a cam for
advancing said slide, and mechanism independent of said cam for returning said
slide, substantially as described.
5 In a screw machine, the combination with the turret slide, a turret mounted
thereon and mechanism for indexing the same, of mechanism for advancing said
slide, and independent mechanism for returning said slide, substantially as
described.
6-In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of mechanism for moving said
slide during the cutting, and independent mechanism for moving said slide during
the non-cutting movement, substantially as described.
7-In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of a continuously moving cam
for advancing said slide, and intermittently operating mechanism for returning
said slide, substantially as described.
8-In a screw machine, the combination with a turret slide, of mechanism for
advancing said slide, and mechanism carried by said slide for returning the same.
substantially as described.
9-In a screw machine, the combination with a turret slide, of a cam for advanc-
ing said slide, and mechanism carried by said slide for returning the same, sub-
stantially as described.
10-In a screw machine, the combination with a turret slide, a turret head
mounted thereon, and mechanism for indexing the same, of mechanism for advanc-
ing said slide, and mechanism carried by said slide and driven from the indexing
mechanism for returning said slide, substantially as described.
11 In a screw machine, the combination with a turret slide, a turret mounted
thereon, and mechanism for indexing said turret, of a reciprocating member, a
bar connected with said slide for engaging said member, means for intermittently
causing a relative reciprocating movement between said bar and turret slide,
and a stop for said bar, substantially as described..
12 In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of a block, a cam and connec-
tions for reciprocating said block, a bar connected with said slide for engaging
said block, a stop for said bar, and means for intermittently causing a relative
reciprocating movement between said turret slide and bar, substantially as
described.
13 In a screw machine, the combination with a turret slide, a turret mounted
thereon, and mechanism for indexing said turret, of a block, means for reciprocat-
ing said block, a bar for engaging said block, a stop for said bar, a crank on said
turret slide, and means for intermittently rotating said crank, substantially as
described.
14-In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of a block provided with a rack,
a lever provided with a segmental gear engaging said rack, a cam for operating
said lever, a bar for engaging said block, a stop for said bar, a crank on said
turret slide connected with said bar, and means for intermittently revolving said
crank, substantially as described.
15 In a screw machine, the combination with a turret slide, a turret mounted
thereon, and mechanism for indexing said turret, of mechanism for advancing
said turret slide, and mechanism operated from the indexing mechanism for
returning said slide, substantially as described.
16 In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of mechanism for moving said
slide during the cutting and mechanism operated from said indexing mechanism
for moving said turret slide during the non-cutting movement, substantially as
described.
17-In a screw machine, a slide, a reciprocating member, a bar connected with

page_text: said slide for engaging said member, means for intermittently causing a relative
reciprocating movement between said slide and bar, and a stop bar for said bar,
substantially as described.
18-In a screw machine, a slide, a block, means for reciprocating said block,
a bar for engaging said block, a stop for said bar, a crank on said slide connected
to said bar, and means for intermittently rotating said crank, substantially as
described.
19-In a screw machine, a slide, a block, a cam and connection for reciprocat-
ing said block, a bar connected with said slide for engaging said block, a stop
for said bar, and means for intermittently causing a relative reciprocating move-
ment between said bar and slide, substantially as described.
20-In a screw machine, a slide, a block provided with a rack, a lever provided
with a segmental gear engaging said rack, a cam for operating said lever, a bar
connected with said slide for engaging said block, a stop for said bar, and means
for intermittently causing a relative reciprocating movement between said bar and
slide, substantially as described.
21 In a screw niachine a slide, a block provided with a rack, a lever provided
with a segmental gear engaging said rack, a cam for operating said lever, a bar
for engaging said block, a stop for said bar, a crank on said slide connected with
said bar, and means for intermittently rotating said crank, substantially as
described.
22 In a screw machine a slide, a rack guided on said slide, a bar guided on
said slide and provided with a shoulder for engaging said rack, a stop for said
bar, an oscillating gear engaging said rack, and means for causing a relative
reciprocating movement between said bar and slide, substantially as described.
23-In a screw machine, a slide, a block guided on said slide, means for recipro-
eating said block, a bar guided on said slide and engaging said block, a stop for
said bar, and means for intermittently causing a relative reciprocating move-
ment between said slide and bar, substantially as described.
24 In a screw machine, a slide, a rack guided on said slide, an oscillating
gear for operating said rack, a bar guided on said slide for engaging said rack,
a stop for said bar, a crank on said slide connected with said bar, and means for
intermittently rotating said crank, substantially as described.
25 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of mechanism for indexing said turret carried by said slide a
driver for said mechanism mounted on the frame, and gearing between said
driver and indexing mechanism, substantially as described.
26 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of mechanism for indexing said turret carried by said slide, a
shaft extending longitudinally of said slide and connected with said mechanism,
a gear on said shaft, a gear mounted on the frame engaging said gear, and means
for intermittently revolving the gear on the frame, substantially as described.
27 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of a disc connected with said turret and provided with radial
slots, a crank on said slide for engaging said slots, and means for intermittently
revolving said crank, substantially as described.
28 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of a disc connected with said turret head, and a crank on said
turret slide arranged to enter and leave said slots when moving radially of said
disc, substantially as described.
29--The combination with means for engaging the stock, of a slide connected
therewith, a lever, an adjustable pivotal connection between said slide and lever,
and means for oscillating said lever, substantially as described.
30 The combination with means for engaging the stock, of a slide connected.
therewith, a lever, a groove in one of said parts, an adjustable stud secured to the
other part and engaging said groove, and means for oscillating said lever, sub-
stantially as described.

page_text: 31-The combination with means for engaging the stock, of a slide connected
therewith, a lever, a slot in one of said parts, a stud secured to the other part and
engaging said groove, means for adjusting said stud in line with said groove when
the lever is at the forward limit of its throw, and means for oscillating said lever,
substantially as described.
32-The combination with means for engaging the stock, of a slide, a screw rod
on said slide, a stud engaged by said screw rod, a lever provided with a groove
engaged by said stud, and a cam for oscillating said lever, substantially as
described.
33-In a screw machine, the combination with a turret head for holding a
series of tools, mechanism for indexing said turret head,, a driver for said
mechanism, a device for holding said driver out of operation, means for tripping
said device to allow the driver to operate, and means for tripping said device to
prevent the driver from being thrown out of operation, substantially as described.
34 In a screw machine, the combination with a turret head for holding a series
of tools, mechanism for indexing said head, a driver for said mechanism, a cam
connected with said driver, an abutment in the path of the cam for holding the
driver out of operation, means for tripping said abutment to render the driver
operative, and means for tripping said abutment to prevent the engagement of
the cam and abutment, substantially as described.
35 In a screw machine, the combination with a turret head, for holding a
series of tools, a clutch, gearing between said clutch and turret head, a cam on
said clutch an abutment in the path of said cam, means for tripping said abut-
ment, a disc driven. from said clutch, and a series of slides carried by said dise
for engaging said abutment, substantially as described.
36 In a screw machine, the combination with a turret head for holding a
series of tools, a clutch, gearing between said clutch and turret head, a cam on
said clutch, an abutment in the path of said cam for holding said clutch out of
engagement, means for tripping said abutment, and a series of adjustable devices
carried by said gearing for holding said abutment out of the path of said cam,
substantially as described.
37 The combination of a clutch, a cam on said clutch, an abutment in the path
of said cam, means for tripping said abutment, a disc driven from said clutch,
and a series of slides carried by said dise for engaging said abutment, substan-
tially as described.
38 The combination of a clutch, a cam on said clutch, an abutment in the
path of said cam, means for tripping the abutment, a disc driven from said clutch,
and a series of adjustable pins for engaging said abutment, substantially as
described.
39 In a screw machine, the combination with mechanism for operating the
jaws of the chuck embodying a cam, a shaft on which said cam is mounted, a
driver for said shaft, means for holding said driver out of operative position,
means for manually operating the jaws of the chuck, and simultaneously throw-
ing said driver into operative position, substantially as described.
40 In a screw machine, the combination with mechanism for operating the
jaws of the chuck, of a driver therefor, means for rendering said driver inoperative,
and means for manually operating the chuck jaws and simultaneously rendering
said driver operative, substantially as described.
41 In a screw machine, the combination with the chuck, of mechanism for
reversing said chuck, mechanism for operating the chuck jaws and feeding the
stock, a cam shaft for operating said feeding and jaw operating mechanism, a
turret, indexing mechanism for said turret, a shaft and intermittently operating
drivers on said shaft for operating the reversing mechanism, cam shaft and in-
dexing mechanism, substantially as described.
42 In a screw machine, the combination with mechanism for operating the
jaws of the chuck embodying a lever, a cam shaft, a cam on said shaft for operat-
ing said lever mechanism for feeding the stock embodying a lever, a cam on

page_text: said shaft for operating said lever, a driver for said shaft, and a cam on said
shaft engaged by the end of the jaw operating lever and so arranged that move-
ment of said lever to open the jaws will turn said shaft, substantially as described.
43 The combination of a shifter, a cam for operating said shifter in, each
direction, a clutch for operating said cam, two cams on said clutch, an abutment
in the path of each cam for holding the clutch out of engagement and means for
rendering said abutments inoperative, substantially as described.
44-In a screw machine, the combination with the spindle one or more cross-
slides, and mechanism for reversing the direction of rotation of the spindle, of a
front shaft one or more cams on the end of said shaft for operating the cross
slides, a second shaft in line with said front shaft provided with means for con-
trolling the reversing mechanism, and a movable coupling between said shafts,
substantially as described.
TT 19th dow of i 1908
WILLIAM SIMEON DAVENPORT.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: Date of Application (in United Kingdom),
Complete Specification Left, 27th Apr., 1898 -Accepted, 5th Nov., 1898
30
Improvements in Lathes or Screw Making Machines.
I, WILLIAM SIMEON DAVENPORT, of the City and County of Providence, and
tate of Rhode Island, United States of America, Mechanical Engineer, do hereby
eclare the nature of this invention, and what manner the same is to be per-
ormed, to be particularly described and ascertained, in and by the following
statement:-
The present improvements relate to screw machines and more especially to
that class of screw machines in which a rod of stock is intermittently fed forward
for the prescribed distance to form an article and is held by the jaws of a revolv-
ing chuck, and successively acted on by a series of tools carried by a tool holder.
One feature of invention relates to means for reducing to a minimum the time
which elapses between the operation of successive tools, and consists in providing
two independent mechanisms for effecting the reciprocation of the support which
carries the series of tools, which support preferably consists of a turret mounted
on a turret slide, one of said mechanisms acting to slowly advance the support
during the cutting, and the other mechanism acting to quickly return the sup-
port to its rearward position. In case the machine is forming short articles, the
support must be advanced some distance before the tools begin to act upon the
stock, and it is therefore preferred to so construct the mechanism for rapidly
returning the support that it may also bring the tools up to the work. With
such a construction the support may be returned, indexed, and again advanced to
bring the succeeding tool up to the work, while the slow running mechanism is
moving into position to again feed forward the support, and the rapidity of the
operation and efficiency of the machine thus increased.
Further features of invention relate to the indexing mechanism, the mechanism
for reversing the chuck spindle, the mechanism for feeding the stock, and other
combinations and constructions which will be more fully set forth hereinafter
and specified in the claims.
In the accompanying drawings in which is illustrated a screw machine embody-
ing the present improvements in their preferred form
Fig. 1 is a front elevation.
Fig. 2 is a rear elevation.
the left hand end of the machine.

page_text: Fig. 4 15 a horizontal sectional view with the back and front shaft removed.
Fig. 5 is a transverse sectional view.
Fig. 6 is a detail plan view of the turret slide and the parts carried thereby.
Fig. 7 is a detail sectional elevation of the same.
Figures 8, 9, and 10 are longitudinal sectional views of the same showing the
parts in different positions.
Figure 11 is an end view of the turret slide.
The jaws of the chuck are carried by the spindle 1 and are operated by a sleeve 2
which is engaged by the ends of levers 4 which fulcrum upon a sleeve 5 secured
to the spindle 1. The levers 4 are operated by a sliding sleeve 6, and said sleeve
is operated by a lever 7 pivoted at 8 and provided with a yoke at its upper end,
the arms of which are pivoted to a collar 9 mounted in a groove in said sleeve 6.
The lower end of lever 7 carries a roll which is engaged by a cam 10 secured
to a cam shaft 11 which is revolved at the proper times to open and close the
jaws of the gripper.
The stock is fed forward by means of the feeding tube 12 which is provided with
the usual spring fingers for engaging the stock, and which is reciprocated at the
proper time by mechanism actuated from a cam 13 secured to the cam shaft 11.
This mechanism which forms a feature of the present invention is so constructed
that the amount of stock fed may be varied without producing lost motion in
the connections, with the result that a more accurate and more efficient feed
of the stock is effected. In the embodiment of this feature of invention shown in
the drawings a lever 14 is pivoted at 151 and is given a definite throw by the
cam 13 which acts upon a roll on the end of said lever. The lever 14 is provided
with a groove in its upper end which is engaged by a stud 15 adjustably mounted
on a slide 16. The slide 16 is guided upon suitable ways 17 formed on the
bracket 18 and is connected with the feed tube 12 by means of a pivoted arm 19
which fits in a groove in the collar 20 loosely mounted between shoulders 21 on
the feed tube. The stud 15 is formed on a nut 22 which is engaged by a screw
rod 23 on the slide 16 and is guided in a groove 24 formed in said slide. A
handle 25 may be placed on the squared end of the rod 23 and said rod turned
to adjust the stud 15 to and from the pivot of the lever 14 and thus vary the
distance through which the slide and feeding tube are moved by the oscillation
of the lever.. The grooves in the slide and lever are so arranged that they are
parallel when the lever is at the forward limit of its throw so that the end of the
feeding tube moves up to the same point without regard to the amount of stock
fed.
The various mechanisms of the machine with the exception of the spindle are
driven from a shaft 26 mounted in bearings 27 secured to the back of the frame
and connected to a short shaft 28 by means of a clutch 29. The shaft 28 is
mounted in the bracket 30 and carries a band pulley 31 at its outer end to which
power may be applied. One member of the clutch 29 is secured to the shaft 28
and the other member 32 is keyed to slide upon the end of shaft 26. The clutch
member 32 may be shifted to stop the operation of the automatic mechanism by
means of a yoke 33, the arms of which are pivoted to a ring on said member,
said yoke being secured to a shaft 34 extending transversely of the machine and
provided with a handle 35 at its front end. The handle 35 carries a spring pressed
pin 36 which engages notches in a plate 37 and serves to hold the clutch member 32
in or out of engagement.
The spindle is rotated in either direction by means of two oppositely running
pulleys 38 and 39 loosely mounted on said spindle and which may be alternately
connected to the spindle by means of a clutch operated by the sleeve 40 in any
well-known manner. The sleeve 40 is shifted to connect either the pulley 38
or 39 to the shaft by means of a lever 41 which is provided with a yoke at its
upper end, the arms of which are pivoted to the ring 42 loosely mounted in a
groove in said sleeve. The shifter lever 41 is operated in each direction by a
cam 43 which is revolved a half revolution at suitable intervals to shift the

page_text: sleeve 40 first in one direction and then in the other, and thus reverse the direction
of rotation of the spindle. The cam 43 is driven from the driving shaft 26 by
the following mechanism: A clutch member 44 is secured to the shaft 26 and
is engaged at intervals by a clutch member 45 connected to the cam 43, said clutch
members cooperating to form a driver for said cam. A sleeve or bushing 46
surrounds the shaft 26 between the clutch member 44 and the bearing 27 and
the clutch member 45 is loosely mounted on this sleeve. The clutch member 45
is provided with a hub 47 which extends within the cam 43 and to which the
cam is keyed so that said cam will be revolved with said clutch member while
allowing a longitudinal movement thereof. A spring 48 is interposed between
the end of the hub 47 and a shoulder on the sleeve 46 and tends to force the
clutch member 45 into engagement with clutch member 44. The clutch member 45
is normally held out of engagement by one or the other of two abutments 49, 50
which engage one or the other of cams 51 and 52 formed on the said clutch member,
said cams being located on diametrically opposite sides of the clutch member.
The abutments 49 and 50 are in the form of pins on the ends of levers 53 and 54
which extend transversely of the machine and are operated at the proper times
by means of tappets 53 and 54' adjustably secured in undercut grooves formed
in a disc 55¹ secured to a shaft 561 at the front of the machine. The arms 53
and 54 are provided with plates 571 and 58¹ against which the tappets act, and
said arms are also provided with handles on their ends whereby they may be
tripped by hand if desired. With the parts in the position shown in Fig. 2
the clutch member 45 is held out of engagement by the abutinent 49 which
engages the cam 51. When the lever 54 is rocked the member 45 is released
and the spring 48 forces the said member into engagement with the revolving
member 44 and the cam 43 is revolved until the cam 52 engages the abutment 50
when the clutch member 45 is again thrown out of engagement and held until
the arm 53 is rocked and the clutch member again released. The levers 53 and 54
are returned immediately after being rocked by springs 55 and the pins ride on the
periphery of the clutch member until engaged by the cams. A pin 56 on the
end of a spring pressed arm 57 engages notches in the periphery of the clutch
member 45 and prevents overrunning of the cam 43 and holds the cam in position.
While it is preferred to employ two abutments as with such a construction the
clutch may be run at a higher rate of speed and the rotation of the spindle be reversed
in more rapid succession, yet it will be understood that a single abutment may
be used if desired, in which case the cams 51 and 52 will both be arranged to
engage said abutment.
The cam shaft 11 is revolved a single revolution at the proper time to open
and close the chuck jaws and to feed forward a new length of stock by the follow-
ing mechanism: A collar 58 secured to the shaft 26 is provided with a clutch
face 59 arranged to be engaged by a clutch member 60 keyed to slide upon a
sleeve 61 which extends through the bearing 271 and has a gear 62 secured to
its end. The gear 62 meshes with a similar gear 63 secured to the cam shaft 11.
A spring 64 is interposed between a shoulder on the sleeve 61 and a shoulder on
the clutch member 60 and tends to force said member into engagement with the
clutch face 59. The clutch member 60 is held out of engagement by means of an
abutment 65 which engages a cam 66 formed on the said clutch member. The
abutment 65 is in the form of a pin on the end of a lever 67 extending transversely
of the machine and rocked against the action of spring 68 at the proper time by
means of one or more tappets 671 adjustably secured in an undercut groove formed
in a disc 681 secured to a shaft 691 mounted in bearings at the front of the
machine. The arm 67 is provided with a plate 70 which is engaged by the
appet 671 and said arm is also provided with a handle whereby may be operated
by hand. When the lever 67 is rocked the clutch member 60 engages the clutch
ace 59 and said member is revolved one revolution when the cam 66 engages
he abutment 65 and disengages the clutch member. A pin on the end of a

page_text: spring pressed arm 69 engages a notch in the periphery of clutch member 60
and prevents overrunning of the clutch member and parts driven thereby.
A turret 70 is secured to a shaft 71 mounted in a turret slide 72 and forms a
support for a series of tools for acting upon the stock carried by the spindle. The
turret is indexed, that is to say, is moved to bring the tools successively into
position to act on the stock by mechanism carried by the turret slide, which in-
dexing mechanism is driven intermittently by mechanism mounted on the frame
and connected with the indexing mechanism by gearing which does not interfere
with the reciprocation of the slide. The indexing mechanism consists of a disc 73
connected with the turret, preferably by being secured to the shaft 71, and pro-
vided with radial slots 73 arranged to be engaged by a crank 74 also mounted
on the turret slide. The crank 74 is carried by a disc secured to a shaft 75
journaled in the slide 72 and having a spiral gear 76 secured thereto, which gear
is engaged by a spiral gear 77 secured to a shaft 78 extending longitudinally of
the slide 72. A gear 79 is secured to the shaft 78 and is engaged by a gear 80
mounted on the frame of the machine, the gear 79 being of such length that
the slide 72 may be reciprocated without disengaging the said gear and gear 80.
The gear 80 is engaged by a gear 81 loosely mounted on the shaft 26. The
gear 81 is intermittently revolved by a clutch member 82 which is secured thereto,
or formed integral therewith and is normally held out of engagement with a
clutch face 83 on the collar 58 by an abutment 84 which engages a cam 85 on
said clutch member. The clutch member is forced towards the collar 58 by a
spring 86 interposed between a shoulder 87 on the shaft 26 and the end of a
recess formed in a sleeve 88 which bears against the hub of gear 81. The
abutment 84 is in the form of a pin in the end of a lever 89 which extends trans-
versely of the machine and is rocked at the proper time by means of a series of
tappets 891 (one only of which is shown adjustably secured in an undercut groove
in a disc 901 secured to the shaft 691). The arm 89 is provided with a plate 911
engaged by the tappets 891 and with a handle whereby said arm may be rocked
by hand. When the lever 89 is rocked the clutch member is revolved a single
revolution and then thrown out as above described with reference to clutch
member 60. A pin 90 on the end of a spring pressed lever 91 engages a notch
in the periphery of the clutch member 82 and prevents said member overrunning.
When the clutch member 82 is revolved it acts through the gearing described
to rotate the shaft 75 a single revolution, and causes the crank 74 to engage one
of the slots 73 and move the turret head a partial revolution. The slots 73¹ in
the disc 73 are so arranged that the crank will enter and leave said slots while
moving radially of the disc 73 and the turret will thus be gradually started and
stopped and may be indexed quickly without any jar either in starting or stopping.
Moreover with this construction of indexing mechanism the turret may remain
locked until the crank enters a slot 73 and may be again locked just before the
crank leaves the slot and thus accuracy of indexing may be insured since the
turret is positively held at all times. By mounting the indexing mechanism on
the turret slide and driving said mechanism from a driver on the frame, which
is always connected with said indexing mechanism, it is not necessary to move
the slide into any fixed position to effect the indexing, but said indexing may
take place with the slide in any position, or while the slide is moving in either
direction.
The turret is locked in position by a spring pressed locking bolt 92 which en-
gages recesses formed in said turret. The bolt 92 is withdrawn just after the
crank 74 enters one of the slots 731 and released just before said crank leaves said
slot by means of a cam 93 secured to the end of shaft 78, which cam acts upon
the end of a lever 94 engaging said bolt.
As shown in the drawings the turret is constructed to carry five tools and in
case five tools are used five tappets 891 will be used and the turret slide will be
advanced after each indexing. In case a fewer number of tools are used, it is
desirable that the turret should be indexed two or more times in rapid succession

page_text: after it has been returned and before the next cutting operation takes place. This
may be accomplished by placing two or more of the tappets 891 close to each other
so that the abutment 84 will be tripped two more times in rapid succession, and
the driving clutch 82 will be thrown into action two or more times in rapid
succession, but it is preferred to provide means for holding or moving the abut-
ment out of operative position as the cam 85 passes said abutment so that the
driver 82 is not thrown out of action until it has revolved two or more times
according as there are four or a less number of tools being used. This feature of
the invention in its preferred form consists of a series of adjustable slides or
other suitable devices which may be moved into or out of operative position and
which when in operative position will hold the abutment 84 out of the path of
the cam 85. As shown in the drawings these devices are in the form of a series
of five pins 95 mounted to slide in the gear 80 and held in position by the set
screws 96.
When adjusted to project beyond the gear these pins engage a
branch 97 of the arm 89 and hold the abutment 84 out of the path of the cam 85.
Thus the driver for the indexing mechanism may be caused to remain in engage-
ment for two or more revolutions according as one or more of the pins 95 projects
beyond the gear 80.
În machines in which the turret slide is reciprocated by means of a cam, said
cam must run at a slow speed in order that the tools may act upon the stock
properly during the cutting, and when the roll which engages the cam reaches
a high point of the cam, and the cutting operation is completed the cam must
revolve far enough to allow the roll to roll over such high point before the return
movement of the slide begins, and must then pass low enough to bring the slide
to its rearward position before the indexing can begin, and then the indexing
must take place and the tool be brought up to the work before the cutting can
begin. In such a construction there is considerable time consumed in thus return-
ing indexing and bringing the tools up to the work, especially when the machine
is forming short articles. It is therefore preferred to use a slow running cam
for advancing the turret slide during the cutting, and to provide independent
and more rapidly acting mechanism for returning the turret slide, and it is also
preferred to so construct this mechanism that it will also advance the turret slide
to bring the tools up to the work. With such a construction the turret slide is
returned, the turret indexed, and the turret slide advanced to bring the succeed-
ing tool up to the work while the roll is passing over the high point of the cam
and passing low enough to bring it into proper position to operate the turret slide
during the cutting operation, and the rapidity of operation is thereby increased.
Any suitable mechanism may be used to thus return the turret slide, but it is
preferred to use a mechanism which is carried by the turret slide, and it is also
preferred to drive said mechanism from the indexing mechanism.
The mechanism for reciprocating the turret slide forms a feature of the present in-
vention. The preferred form of such mechanism is shown in Figs. 6-10, and is as
follows: A disc 98 is secured upon the end of shaft 75 and a corresponding disc 99 is
secured to the end of a stud 100 mounted in a bearing 101 upon the slide 72, the
axes of said stud and shaft being in line. A crank pin 102 connects said discs and
passes through one end of a link 103 the other end of which is pivotally con-
nected to a bar or block 104 mounted to slide upon the slide 72. An abutment
or stop 105 secured to the frame is arranged to engage the end 106 of the bar 104.
A reciprocating member in the form of a U-shaped block 107 is mounted upon
the slide 72, the arms of the U extending upon opposite sides of the bar 104 and
the end of said block, being engaged by the shoulder 108 upon the block 104.
The block 107 is provided with rack teeth 109 which are engaged by a segmental
gear 110 forming one arm of a lever 111 pivoted at 112 and carrying a roll 113 at
its other end. The roll 113 rides on the surface of a cam 114 being held thereon
by a spring pressed bolt 115 which engaged the lever 111.
The operation is as follows: During the cutting operation the crank 102 and
link 103 stands in the position shown in Fig. 8 and rigidly connect the bar 104

page_text: and the slide 72. The block 107 engages the shoulder 108 on the bar 104 and as
the roll 113 rides up one of the lobes of the cam 114 the block 107 acting through
said connections advances the slide 72. When the cutting is completed the
parts will stand in the position shown in Fig. 8 with the bar 104 engaging the
stop 105 and the roll 113 upon the point 116 of the cam 114. The abutment 84
will now be tripped and the shaft 75 revolved a single revolution.
As the shaft revolves into the position shown in Fig. 9 the crank 102 will act
through the link 103, bar 104, and stop 105 to draw back the slide 72 and draw
the tool off the stock. In the meantime the roll 113 will roll over the point 116
of the cam 114 and the block 107 will slowly move back away from the shoulder 108.
As the shaft 75 continues to revolve, the crank 74 will enter one of the slots 731
and turn the turret 70 to bring the next tool into position. At the completion of
the indexing the parts will occupy the position shown in Fig. 10. When the
crank 102 is diametrically opposite its normal position, the return of the slide 72
will have been completed, and as the crank continues to revolve the bar 104 will
be moved back away from the stop 105. During this time the roll 113 has been
passing down the incline 117 of the cam 114 and the block 107 has been moving
back. As the crank 102 completes its revolution, the roll reaches the low part
of the cam and starts up the succeeding lobe 118. In case short articles are
being formed, the backward movement of the block 107 is only a fraction of the
backward movement of the slide 72, and during the latter part of the rotation of
the crank 102 the shoulder 108 will therefore bear against the end of block 107
and the slide 72 will be advanced by the action of the crank and bar 104. When
the crank has completed its revolution the slide 72 will have been advanced to
bring the tool 119 up to the work and said tool will then be advanced along the
stock by the action of the slow running cam 114. Thus the turret slide will be
advanced during the cutting by a slow running mechanism and will be returned
and advanced to bring the tools up to the work by a quick running mechanism
and the time required to make the changes between successive cuts reduced to a
minimum and the efficiency of the machine thereby increased. While it is pre-
ferred to mount the parts of the return mechanism upon the slide as by such an
arrangement a compact construction is provided, it will be understood that the
invention is not limited to such an arrangement, but that the parts may be other-
wise arranged if desired.
.
The cam 114 is secured upon the end of a shaft 120 mounted in the bearing 121,
said cam being held upon said shaft by means of a nut 122 which screws upon the
end of the shaft and clamps said cam against a disc 123. The nut 122 is provided
with a shank 124 which extends beyond the frame of the machine and is pro-
vided with a squared end to receive a wrench. A gear 125 is secured to the
shaft 120 and is engaged by a gear 126 secured to a second cross shaft 127 which
carries a worm wheel 128 keyed to its end outside the frame and engaged by a
worm 129 formed on a shaft 130. The shaft 130 is driven from the shaft 26
by a series of change gears 131.
The front shaft 691 is driven from the shaft 127 by means of bevel wheels 132
and 133 secured to the shafts 127 and 69¹ respectively. The shaft 691 also has
secured thereto the cams 134 and 135 for operating the cross-slides 136 and 137.
These cams are mounted upon the end of shaft 691 outside its bearing so that
said cams may be readily changed. The shaft 56' is in line with shaft 691, and is
connected thereto by a coupling 138 which is arranged to slide on the shaft 56¹ to
allow the removal of the cams 134 and 135. The coupling 138 is provided with
projections 139 which are arranged to engage recesses 140 in a collar 141 secured
to the end of shaft 691, and said coupling is connected to the shaft 56 by means
of a spline and groove so that said coupling may be moved longitudinally of said
shaft. A pin 142 secured to a leaf spring 143 is carried by the coupling and two
recesses 144 are formed in the shaft 561 in position to be engaged by said pin, one
of said holes being engaged by the pin when the coupling is in engagement with

page_text: 141 and the other being engaged when the coupling is slid back as
shown in Fig. 1.
The cross-slide 136 is operated from the cam 134 by means of a lever 145 pro-
vided with gear teeth which engage a rack 146 on the cross-slide. The cross-
slide 137 is operated from the cam 135 by means of a lever 147 which engages
a segmental gear 148 secured to a shaft "149, which shaft carries a second seg-
mental gear 150 which engages a rack 151 on the slide 137. Both of the
levers 145 and 147 extend to the front of the machine and overlie their operating
cams and are provided with sockets 152 for the reception of handles for manually
operating the cross-slides.
When the rod of stock is used up and it is desired to insert a new rod of stock
the operation of the parts of the machine other than the spindle must be stopped
for this purpose, and the jaws of the chuck must be opened to receive the new
rod of stock. In the present machine means are provided for manually opening
the jaws of the chuck, and at the same time throwing the driver for the cam
shaft into engagement so that when the machine is started up the jaws of the
chuck will be closed and the feed mechanism moved into position to feed forward
the stock when the cam shaft is again revolved. The jaws of the chuck are
manually opened by moving the lever 7 by means of a handle 1521 attached to
said lever. A cam 153 is secured to the shaft 11 and is arranged to be acted
on by the roll on the end of lever 7 when said lever is rocked to open the jaws
of the chuck, The action of this roll on the cam turns the shaft 11 slightly and
thus through the gears 62 and 63 turns the clutch member 60 far enough to carry
the cam 66 past the abutment 65 and allows said clutch member to move into
engagement with the clutch face 59. This movement of the shaft 11 also brings
the point 154 of cam 13 past the roll on the end of lever 14 so that the said lever
is free to swing forward when the rod of stock is inserted. Now when the machine
is started, the shaft 11 completes its revolution and the jaws of the chuck are
closed and the feeding tube moved back ready to feed forward a new portion of
stock.
The chips forms by the cutting tools as well as the completed articles formed
by the action of the various tools and severed from the end of the rod of stock
pass down through a chute 155 passing down through the frame of the machine
and means are provided for separating the articles from the chips which consists
of a deflector plate which normally stands out of the path of the chips, but which
is moved into the path of the chips just as the article is severed and deflects
said article. This plate 156 is secured to the end of a lever 157 which is pivoted
at 158 and held in normal position by the spring 159. Just as the article is
severed the end of the lever 157 is engaged by a cam 160 adjustably secured in an
undercut groove 161 in the disc 681, and is swung across the path of the chips.
The articles falling down the chute 155 strikes the plate 156 and are deflected
into a receptacle placed to receive them.
The general operation of the machine will be understood from the detail des-
cription of the operation of the various parts as above set forth.
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-The combination of a support for a plurality of tools, of mechanism for
indexing said support, mechanism for advancing said support, and independent
mechanism for returning said support, substantially as described.
2 The combination of a support for a plurality of tools, of mechanism for
indexing said support, a cam for advancing said support, and mechanism inde-
pendent of said cam for returning said support, substantially as described.
3-In a screw machine, the combination with the turret slide, of mechanism
for advancing said slide, and independent mechanism for returning said slide,
substantially as described.

page_text: 4-In a screw machine, the combination with the turret slide, of a cam for
advancing said slide, and mechanism independent of said cam for returning said
slide, substantially as described.
5 In a screw machine, the combination with the turret slide, a turret mounted
thereon and mechanism for indexing the same, of mechanism for advancing said
slide, and independent mechanism for returning said slide, substantially as
described.
6 In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of mechanism for moving said
slide during the cutting, and independent mechanism for moving said slide during
the non-cutting movement, substantially as described.
7-In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of a continuously moving cam
for advancing said slide, and intermittently operating mechanism for returning
said slide, substantially as described.
S--In a screw machine, the combination with a turret slide, of mechanism for
advancing said slide, and mechanism carried by said slide for returning the same,
substantially as described.
9-In a screw machine, the combination with a turret slide, of a cam for advanc-
ing said slide, and mechanism carried by said slide for returning the same, sub-
stantially as described.
10 In a screw machine, the combination with a turret slide, a turret lead
mounted thereon, and mechanism for indexing the same, of mechanism for advane-
ing said slide, and mechanism carried by said slide and driven from the indexing
mechanism for returning said slide, substantially as described.
11-In a screw machine, the combination with a turret slide, a turret mounted
thereon, and mechanism for indexing said turret, of a reciprocating member, a
bar connected with said slide for engaging said member, means for intermittently
causing a relative reciprocating movement between said bar and turret slide,
and a stop for said bar, substantially as described.
12 In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of a block, a cam and connec-
tions for reciprocating said block, a bar connected with said slide for engaging
said block, a stop for said bar, and means for intermittently causing a relative
reciprocating movement between said turret slide and bar, substantially as
described.
13 In a screw machine, the combination with a turret slide, a turret mounted
thereon, and mechanism for indexing said turret, of a block, means for reciprocat-
ing said block, a bar for engaging said block, a stop for said bar, a crank on said
turret slide, and means for intermittently rotating said crank, substantially as
described.
14 In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of a block provided with a rack,
a lever provided with a segmental gear engaging said rack, a cam for operating.
said lever, a bar for engaging said block, a stop for said bar, a crank on said
turret slide connected with said bar, and means for intermittently revolving said
crank, substantially as described.
15 In a screw machine, the combination with a turret slide, a turret mounted
thereon, and mechanism for indexing said turret, of mechanism for advancing
said turret slide, and mechanism operated from the indexing mechanism for
returning said slide, substantially as described.
16 In a screw machine, the combination with a turret slide, a turret mounted
thereon and mechanism for indexing said turret, of mechanism for moving said
slide during the cutting and mechanism operated from said indexing mechanism
for moving said turret slide during the non-cutting movement, substantially as
described.
17-In a screw machine, a slide, a reciprocating member, a bar connected with

page_text: sad side for engaging said member, means for intermittently causing a relative
reciprocating movement between said slide and bar, and a stop bar for said bar,
substantially as described.
18 In a screw machine, a slide, a block, means for reciprocating said block,
a bar for engaging said block, a stop for said bar, a crank on said slide, connected
to said bar, and means for intermittently rotating said crank, substantially as
described.
19 In a screw machine, a slide, a block, a cam and connection for reciprocat-
ing said block, a bar connected with said slide for engaging said block, a stop
for said bar, and means for intermittently causing a relative reciprocating move-
ment between said bar and slide, substantially as described.
20-In a screw machine, a slide, a block provided with a rack, a lever provided
with a segmental gear engaging said rack, a cam for operating said lever, a bar
connected with said slide for engaging said block, a stop for said bar, and means
for intermittently causing a relative reciprocating movement between said bar and
slide, substantially as described.
21-In a screw machine a slide, a block provided with a rack, a lever provided
with a segmental gear engaging said rack, a cam for operating said lever, a bar
for engaging said block, a stop for said bar, a crank on said slide connected with
said bar, and means for intermittently rotating said crank, substantially as
described.
22 In a screw machine a slide, a rack guided on said slide, a bar guided on
said slide and provided with a shoulder for engaging said rack, a stop for said
bar, an oscillating gear engaging said rack, and means for causing a relative
reciprocating movement between said bar and slide, substantially as described.
23 In a screw machine, a slide, a block guided on said slide, means for recipro-
cating said block, a bar guided on said slide and engaging said block, a stop for
said bar, and means for intermittently causing a relative reciprocating move-
ment between said slide and bar, substantially as described.
24-In a screw machine, a slide, a rack guided on said slide, an oscillating
gear for operating said rack, a bar guided on said slide for engaging said rack,
a stop for said bar, a crank on said slide connected with said bar, and means for
intermittently rotating said crank, substantially as described.
25 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of mechanism for indexing said turret carried by said slide a
driver for said mechanism mounted on the frame, and gearing between said
driver and indexing mechanism, substantially as described.
26 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of mechanism for indexing said turret carried by said slide, a
shaft extending longitudinally of said slide and connected with said mechanism,
a gear on said shaft, a gear mounted on the frame engaging said gear, and means
for intermittently revolving the gear on the frame, substantially as described.
27--In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of a disc connected with said turret and provided with radial
slots, a crank on said slide for engaging said slots, and means for intermittently
revolving said crank, substantially as described.
•
28 In a screw machine, the combination with a turret slide, and a turret
mounted thereon, of a disc connected with said turret head, and a crank on said
turret slide arranged to enter and leave said slots when moving radially of said
disc, substantially as described.
29 The combination with means for engaging the stock, of a slide connected
therewith, a lever, an adjustable pivotal connection between said slide and lever,
and means for oscillating said lever, substantially as described.
30 The combination with means for engaging the stock, of a slide connected
therewith, a lever, a groove in one of said parts, an adjustable stud secured to the
other part and engaging said groove, and means for oscillating said lever, sub-
stantially as described.

page_text: 31The combination with means for engaging the stock, of a slide connected
therewith, a lever, a slot in one of said parts, a stud secured to the other part and
engaging said groove, means for adjusting said stud in line with said groove when
the lever is at the forward limit of its throw, and means for oscillating said lever,
substantially as described.
32-The combination with means for engaging the stock, of a slide, a screw rod
on said slide, a stud engaged by said screw rod, a lever provided with a groove
engaged by said stud, and a cam for oscillating said lever, substantially as
described.
1
33-In a screw machine, the combination with a turret head for holding a
series of tools, mechanism for indexing said turret head, a driver for said
mechanism, a device for holding said driver out of operation, means for tripping
said device to allow the driver to operate, and means for tripping said device to
prevent the driver from being thrown out of operation, substantially as described.
34-In a screw machine, the combination with a turret head for holding a series
of tools, mechanism for indexing said head, a driver for said mechanism, a cam
connected with said driver, an abutment in the path of the cam for holding the
driver out of operation, means for tripping said abutment to render the driver
operative, and means for tripping said abutment to prevent the engagement of
the cam and abutment, substantially as described.
35 In a screw machine, the combination with a turret head, for holding a
series of tools, a clutch, gearing between said clutch and turret head, a cam on
said clutch an abutment in the path of said cam, means for tripping said abut-
ment, a disc driven from said clutch, and a series of slides carried by said disc
for engaging said abutment, substantially as described.
36 In a screw machine, the combination with a turret head for holding a
series of tools, a clutch, gearing between said clutch and turret head, a cam on
said clutch, an abutment in the path of said cam for holding said clutch out of
engagement, means for tripping said abutment, and a series of adjustable devices
carried by said gearing for holding said abutment out of the path of said cam,
substantially as described.
37-The combination of a clutch, a cam on said clutch, an abutment in the path
of said cam, meuns for tripping said abutment, a disc driven from said clutch,
and a series of slides carried by said disc for engaging said abutment, substan-
tially as described.
38 The combination of a clutch, a can on said clutch, an abutment in the
path of said cam, means for tripping the abutment, a disc driven from said clutch,
and a series of adjustable pins for engaging said abutment, substantially as
described.
39 In a screw machine, the combination with mechanism for operating the
jaws of the chuck embodying a cam, a shaft on which said cam is mounted, a
driver for said shaft, means for holding said driver out of operative position,
means for manually operating the jaws of the chuck, and simultaneously throw-
ing said driver into operative position, substantially as described.
40 In a screw machine, the combination with mechanism for operating the
jaws of the chuck, of a driver therefor, means for rendering said driver inoperative,
and means for manually operating the chuck jaws and simultaneously rendering
said driver operative, substantially as described.
41 In a screw machine, the combination with the chuck, of mechanism for
reversing said chuck, mechanism for operating the chuck jaws and feeding the
.stock, a cam shaft for operating said feeding and jaw operating mechanism, a
turret, indexing mechanism for said turret, a shaft and intermittently operating
drivers on said shaft for operating the reversing mechanism, cam shaft and in-
dexing mechanism, substantially as described.
..42-In a screw machine, the combination with mechanism for operating the
jaws of the chuck embodying a lever, a cam shaft, a cam on said shaft for operat-
ing said lever mechanism for feeding the stock embodying a lever, a cam on

page_text: said shaft for operating said lever, a driver for said shaft, and a cam on said
shaft engaged by the end of the jaw operating lever and sò arranged that move-
ment of said lever to open the jaws will turn said shaft, substantially as described.
43 The combination of a shifter, a cam for operating said shifter in each
direction, a clutch for operating said cam, two cams on said clutch, an abutment
in the path of each cam for holding the clutch out of engagement and means for
rendering said abutments inoperative, substantially as described.
44 In a screw machine, the combination with the spindle one or more cross-
slides, and mechanism for reversing the direction of rotation of the spindle, of a
front shaft one or more cams on the end of said shaft for operating the cross
slides, a second shaft in line with said front shaft provided with means for con-
trolling the reversing mechanism, and a movable coupling between said shafts,
substantially as described.
P
1 1908
WILLIAM SIMEON DAVENPORT.
Haseltine, Lake & Co.,
45, Southampton Buildings, London; W.C., Agents for the Applicant.