Dec. 10,1946. H. L. cRUM - 2,412,324 STOP FOR STRAND COVERING MACHINES Filed April 2l, 1945 1 . JNVENToR Maru’L. 6kg/7a BYA Í ` , ATTORNEY 2,412,324 Patented Dec. 10, 1946 „ U NITE-D >STATE S PAT EN T O FFI CE l _ »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.