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Патент USA US2412324

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Dec. 10,1946.
H. L. cRUM
-
2,412,324
STOP FOR STRAND COVERING MACHINES
Filed April 2l, 1945
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JNVENToR
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ATTORNEY
2,412,324
Patented Dec. 10, 1946
„ U NITE-D >STATE S PAT EN T O FFI CE
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»2,412,324
s'ror ron STRAND covsnlNG MAcniNEs
Howard L. Crum, St. Louis, vM0.
spontanen April 21, 1945, ‘serial No. 589,526
l3 claims.
1
, This invention relates to anattachmentlor stop
'device for a strand covering machine.
‘Such a machine is employed to cover a strand
lwith a vfabric coating, either by braiding or knit
ting a sleeve> upon' and about the strand which
usually is, Ubut not necessarily an electric conduc
tor.- One -such machine is illustrated and de
¿Sc‘ribed in Patent NO; 2,084,770, issued June 22,
1937, and its ,commercial embodiment manufac
tured -by Wardwell Braiding Machine Co., of Cen
tral Falls, R. I., and sold under the trade name
“Wardwellian” The embodiment of the present
invention specifically illustrated and described
(ci. 87-19)
2
2c which is usually but not necessarily, an elec,tric'conduc'tor, andthis conductor may be covered
with insulating material. The strand is covered
by the machine with a covering or sleeve of fabric
2b which may be either braided or woven. It
emerges from the machine in this condition, as
'shown in Fig. 2. If the strand material being vfed
to the‘machine is exhausted, the machine con
tinues its operation, knitting or braiding a sleeve,
which is unfilled and limp, as vshown at V3, Fig. 3.
The function of the device of the present in'
vention is to detect this limp unfilled sleeve, and
in response to stop the machine so that wasteful
operation will not continue. This is accomplished
herein is adapted for use on that particular ma
chine. It will be understood, of course, that the 15 by controlling, or as speciñcally shown, in closing
an electric circuit which includes a responsive
present invention is not limited to use with this
device to stop the machine.
particular machine, and specific mention thereof
is made merely to better describe the invention
and its application by an exemplii‘lcation 0f its
use.
Such machines are automatic and do not re
quire the constant and undivided attention of an
operator. Hence, in actual commercial practice
The attachment includes a guide or sleeve 4
for the cable, which sleeve is secured by set screws
5 to the end of the discharge tube I of the cover
ing machine. The attachment preferably has a
bushing 5, pressed into the sleeve 4 and remov
able for replacement, when desired, because of
wear or for the insertion of a bushing having a
'several machines are placed under the supervision
of one operator. The result has been that when 25 different bore to pass a cable of different size.
A notch 'I is cut in the cylindrical guide or
the reel supplying the inner core is empty, the
sleeve ß correspondingly in the bushing 6 to pro
machine will continue to weave or braid the en
vide a space for the operation of a feeler or dog
velope or fabric sleeve, causing extensive loss in
8, and a seat 9, upon which the dog may close,
material, since such empty sleeve must be dis
carded. The primary object of this invention is 30 to complete an electric circuit. The dog 8 and '
'seat 9 are, in one aspect, terminals of an electric
to prevent this loss and to stop the machine when
switch.
the core is no longer being fed to it.
The dog 8 has a backing of insulating material
Another object of the invention is to provide
comprising a block lil, to the face of which it ls
such a device which may be attached to the ma
attached by screws H, and in turn the block l0
chine Without material modification of it, and
is secured by a screw I2 to the end of a spring
which is simple in construction, and eflicient in
strip or resilient arm i3. The arm I3 is secured
to
the cylindrical guide or sleeve 4 by a screw
A preferred embodiment of the invention is
I4, and is adjustably tensioned by a screw I5.
illustrated in the accompanying drawing, in
It may now be understood that as the cable
40
which
2
emerges
from the machine in proper form, the
Fig. l is a plan View of an attachment embody
operation.
ing the invention;
Fig. 2 is a longitudinal section showing posi
tion of the parts under normal operating condi
tions;
Fig. 3 is a View, similar to Fig. 2, showing the
position of the parts when the core or strand
is not being fed;
Fig. 4 is a cross section on line 4----4, Fig. 2; and
Fig. 5 is a circuit diagram.
The attachment, illustrated in Fig. l, is se
cured to the strand covering machine at its point
of output; or more specifically to the end of a
tube I, from which the completed cable 2 is dis
charged. The cable includes a central strand
dog 8 is kept away from the seat 9, but in the
event of failure in supply of the strand 2a, the
sleeve 2b is unñlled and limp, permitting the dog
8, fastened to the end of the resilient arm I3 to
close upon the seat 9, and thus complete an elec
tric circuit and thereby stop the machine. A
lead wire lli is electrically connected to the dog
8 by one of the screws Il.
A circuit, eiiective for the purpose, is illus
trated in Fig. 5. The dog 8 and seat 9 form co
operating terminals of an electric switch, which
when closed energizes a relay Il to open a circuit
, I8, which may be understood as supplying power
to a motor which drives the machine. In actual
¿2,412,324
H 'i
'
3
practice, the switch 8, 9 may be connected in the
machine and adapted to pass a covered strand
circuit of a commercial control apparatus some
times supplied with such machines and intended
to operate in such a manner as to stop the ma
as it issues from the machine, a seat provided
on the guide by a notch therein and forming a
switch point, a spring arm secured at one end
chine responsive to conditions with which the
to the surface at the cylinder, a dog fastened to
y
the free end of the arm, positioned in the notch
It will be obvious from the foregoing descrip > ~ to press against a covered strand passing through
tion that the invention accomplishes its objects.
the guide, and toward the said seat and form
Various changes may be made in the details of
ing a switch point cooperating with said seat, the
construction, within the scope of the appended 10 parts being so positioned and proportioned that
claims, without departing from the spirit of this
the two switch points will normally be held apart
invention.
by
the covered strand passing beneath the dog
I claim:
but permitted to close in the absence of the
1. A stop for a strand covering machine located
strand.
at the discharge position on the machine, having 15
3. In a stop for a strand covering machine an
a guide for the covered strand, a spring'pressed
attachment Vfor the machine including a guide
dog opposed to the guide> and engaging the
atvthe discharge position on the machine and
strand, an electric switch comprising a switch>
having an oriñce adapted to pass a covered strand
point ñxed to the guide and a cooperatinglswitch
as it issues from the machine, a seat on the guide
point secured to and movable with the dog in
adjacent the oriñce and forming a switch point,
,such a relationship that the two switch points
a spring pressed dog opposedto the guide and
will normally be heldapart by the covered strand
positioned to- press against a covered strand ad
passing between the guide and the dog but per
jacent said orifice and toward said seat and form
Ãrmitted to close in the absence of the strand, and
ing a switch point cooperating with said seat,
¿electrical means for stopping the machine con 25 the parts being so positioned and proportioned
trolled by said switch, whereby the machine is
that the two switch points will normally be held
stopped automatically after failure of a supply
apart by the covered strand passing beneath the
.of-*the strand to the machine.
dog but permitted to close in the absence of the
present invention is not concerned.
2. In a stop for a strand covering machine an
attachment for the machine including a, cylindri
_Cal guide placed at the discharge position on the
strand.
30
\
HOWARD L. CRUM.
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