mprovements in Nick or Slot Making Mechanism for Screw Making Machines.
Year: 1891

page_text: COMPLETE SPECIFICATION.
mprovements in Nick or Slot Making Mechanism for Screw Making
Machines.
I, Arthur HerbeRT EDDY, of the City of Hartford, in the County of Hart-
ford and State of Connecticut, United States of America, Manufacturer, do hereby
leclare the nature of this invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to improvements in slotting attachments for screw machines,
and the object of my improvement is to provide an attachment to screw machines
for automatically taking the screw from the tool which severs it from the rod and
presenting it to a suitable saw for slotting.
In the accompanying drawings ;-
Figure 1 is a front elevation, partly in central vertical section, of an automatic
screw machine with my slotting attachment applied thereto.
Figure 2 is a side elevation of one of the cams.
Figure 3 is a side elevation of the main portion of said machine on an enlarged
scale.
Figure 4 is a partial front elevation and partial longitudinal section of parts of
said machine, the same being on a scale smaller than Fig. 3, but larger than Figs. 1
and 2.
Figure 5 is a plan view of corresponding parts of the machine with some of the
parts in horizontal section.
Figure 6 is an end view of the head which carries the cutting off tool.
Figure 7 is a plan view of a detached portion of the head.
Figure 8 is a partial vertical section and front elevation of portions of said machine
with the parts in a different position from that shown in the preceding figures,
and-
Figure 9 is a side elevation of certain cams, the same being on a scale corre-
sponding with that of Fig. 3.
upon
My invention is applicable to any automatic screw machine in which the stock
is cut off within a hollow spindle. The machine as shown is provided with a
horizontally reciprocating carriage A, a vertically reciprocating carriage B
which is mounted the straightening and feeding devices, the carriage A being
reciprocated by means of cams on the cam wheel C, while the vertical carriage
is raised by means of the cam D on the shaft E. The revolving spindles 10, 11,
and 12, are provided with suitable tools or heads for turning down the stock,
cutting the thread, turning the head of the screw, and cutting the screw from
the rod or stock, the rod being held against rotation and presented to the
respective tools by the reciprocation of the carriages before described. The
spindle 12 is hollow and provided with a head 13 having a sliding tool
carriage 14 mounted to slide in a suitable slot transversely to said head and
bearing a cutting-off tool 15. It is also provided with a longitudinal slot
through which a screw 18 passes into the sliding carriage so that when the
sliding cam is moved longitudinally in the head the sliding tool carriage is
moved transversely thereto. This cam 16 is provided with a grooved sleeve 19
for engagement with a shipper 20, said shipper being operated by means of cams
on the cam wheel F. This particular machine and tool head are not of my
invention, but as said tool head forms an element of my combination I have thus
described it in detail, my attachment being designed for taking the screws from
said head as they are severed from the stock by the cutting-off tool in said
head.
To the frame G of the machine, I pivot a swinging frame 21 as at 22, said frame

page_text: being provided with a downwardly extending arm 23 for being engaged by the
cam 24 on the shaft E. Within the upper part of said frame 21 1 arrange the
slide 25 the same being hollow at its front end so as to receive and hold a screw and
slotted longitudinally on its upper side to receive the knock-out 26 as shown. Said
knock-out is provided at one end with a lug 27 and it is fitted so as to slide loosely
within its slot. Near the end of the shaft II pivot a T-lever 28 to a loose sleeve 29
and at the ends of said sleeve I secure the cams 30 and 31 to the shaft E so that
they revolve therewith. These cams are for bearing alternately upon the respective
ends of the head or cross arm 32 of said T-lever for reciprocating said lever, the
cams being shaped so as to give to said lever the respective strokes hereinafter
described. The upper end of the T-lever is connected by means of a pivoted
link 33 to a block 34 which is clamped upon or secured to the slide 25. At another
point on the frame G in suitable bearings I secure a spindle 35 bearing a driving
pulley 36 and saw 37, the same being arranged so as to bring the saw a little to one
side of the spindle 12 at the end opposite its head.
The motion of the cams 30 and 31 on the head 32 of the T-lever 28 have a
tendency to throw the upper end of said lever to the right as shown in Fig. 3,
thereby swinging the frame 21 in such a direction as to keep its arm 23 in
contact with the cam 24. The cam 30 operates the T-lever in the direction to
carry the slide 25 forward, and the cam 31 operates it to carry the slide in
the reverse direction. About the time that the cams on the cam wheel F move
the shipper 20 in the direction for bringing the cutting-off tool of the tool
carriage 14 of the head 13 into action, the cam 30 will have carried the slide 25
forward so that its hollow end receives the end of the screw as shown in Fig. 8.
When the slide is being thus presented to the screw its end engages the end of
the knock-out and forces the knock-out into the slide so as to admit the screw
as shown in said Fig. 8. After the cutting-off tool has severed the screw from
the stock, the cam 31 acts to withdraw the slide and carry it back far enough
so that the head of the screw is drawn back beyond the plane in which the
rear edge of the cutter 37 lies. The cam 24 now acts upon the arm 23 to
swing the frame 21 so as to bring the slide 25 in alignment with the saw. The
tail a of the cam 30 now acts to move the T-lever 28 in a direction to bring
the slide forward again and present the screw head to the saw, the depression b
in the edge of the cam 31, (see Figs. 3 and 9) pernitting the head or
arm 32 of the T-lever to thus move. The saw is driven by means of a suitable
belt running over the pulley 36. The projection on the cam 31 which follows
.the depression b then acts to move the T-lever 28 and slide 25 back away
from the saw and to bring the lug or projection 27 of the knock-out against
the rear bearing 38 of the frame 21 and force the forward end of the knock-
out near enough to the end of the slide to discharge the screw, this position
of the knock-out within the slide being shown in Fig. 4. When the cam 24
passes the end of the arm 25, the frame 21 swings back again into its former
position to bring the slide into alignment with the hollow spindle 12.
cross
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. The combination of the slide 25, the lever 28 and the cams 30 and 31 arranged
to act alternately on the head or cross arm of the lever for reciprocating said slide,
substantially as described and for the purpose specified.
2. The combination of the swinging frame 21, the slide 25 mounted in said frame,
the lever 28, the cams 30 and 31 for acting thereon, and the cam 24 for moving said
frame, substantially as described and for the purpose specified.
3. The combination of the swinging frame 21, the cam 24, slide 25 mounted in
said frame, the lever 28, the cams 30 and 31 for acting thereon, the hollow spindle 12
of a screw machine and the saw 37 arranged by the side of said spindle, substantially
as described and for the purpose specified.

page_text: 4. The combination of the hollow spindle 12, its reciprocating cutting-off tool, the
reciprocating slide 25 and mechanism for operating said slide for presenting it to
the screw within said spindle, substantially as described and for the purpose
specified.
5. The combination of the slide 25, the lever 28 connected to said slide, the
cam 30 having the tail a and the cam 31 having the depression band following rise
or projection c, substantially as described and for the purpose specified.
6. The combination of the swinging frame 21, the slide 26 mounted therein, and
mechanism for reciprocating said slide and for rocking said swinging frame, substan-
tially as described and for the purpose specified.
7. The combination of the spindle 12 of a screw machine within which the screw
is cut from the stock, the revolving cutter 37 set to one side of said spindle, the
swinging frame 21, the slide 25 mounted therein, and mechanism for reciprocating
said slide and rocking said frame to present the slide first to the spindle and then
to the saw, substantially as described and for the purpose specified.
8. The combination of the spindle of a screw machine within which the screw is
cut from the stock, the slide 25 mounted in a suitable frame, the knock-out 26
provided with a lug 27 for engaging said frame, and mechanism for reciprocating
said slide, substantially as described and for the purpose specified.
Dated this Twenty-eighth day of January One thousand eight hundred and
ninety-one
ARTHUR HERBERT EDDY.
W. P. Thompson & Boult,
Agents for the Applicant.