US 3330016 A
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July 11, 1967 s n- ET AL WARPER STOP MOTION 2 Sheets Sheet 1 Filed July 21, 1965 INVENTOR. PHI Ll P N SM IT H BY WE I R E. WHA RTO N ATTORNEY July 11, 1967 P. N. SMITH ET AL 3,330,016
WARPER STOP MOTION Filed July Zl, 1965 2 Sheets-$heet 2 PHILIP N. SMITH BY WE l R E W HAR TO N q [g WvwJir w ATTORNEY United States Patent 3,330,016 WARPER STOP MOTION Philip N. Smith and Weir Edward Wharton, Spartanburg,
S.C., assignors to Deering Milliken Research Corporation, Spartanburg, S.C., a corporation of Delaware Filed July 21, 1965, Ser. No. 473,775 12 Claims. (Cl. 28-51) This invention relates generally to a stop motion control for textile machinery and more particularly to a control to detect and stop a warper upon the breakage of a strand of yarn being supplied to a warper from the creel.
There are various devices, called stop motions, now in use on warpers which operate upon breakage of a warp end to stop the motor driving the take-up beam or otherwise to arrest the travel of the warp. In most of the devices n-ow in commercial use, each end of yarn, destined to form the warp of a fabric, passes through an eye of a drop wire and supports the wire out of contact with a metal bar below it. When the end breaks, the resulting slackening of tension therein permits the drop wire to make contact with the bar making an electrical connection with a bar holding the drop wires and closing a control circuit for arresting rotation of the take-up beam.
A very common cause of faulty operation in such prior art devices is the fact that the electrical contact arrangement is open and is thus exposed to dirt and lint and to the corrosive effect of moisture, any or all of which may prevent proper contact of the drop wire with the bar below it and may thus inhibit the flow of sufiicient current in the control circuit. When relatively high voltages are used at the contacts, there is danger of shock to the operator. Also with high voltages dust particles, and fly, accumulate by electro-static attraction.
It is therefore an object of this invention to provide a stop motion control which will operate over a long period of time without the necessity of service and repair.
A further object of the invention is to provide a stop motion control which incorporates a hermetically sealed switching arrangement to prevent damage to the control due to ambient dust and lint.
A's-till further object of the invention is to provide a stop motion control in which hermetically sealed switches are employed to increase the service life of the control by decreasing the possibility of wear fatigue of the switch.
Another object of the invention is to provide a stop motion for warpers which is sensitive and reliable in operation and which is free from hazard of shock to the operator. 7
Other objects and advantages of our invention will be clearly apparent as the specification proceeds to describe the invention with reference to the accompanying drawings, in which: i
FIGURE 1 is a schematic perspective view of a warper and associated stop motion arrangement;
FIGURE 2 is a blown-up view of a drop wire of this invention when the warper is in operation;
FIGURE 3 is a view similar to FIGURE 2 except the drop wire has been dropped down due to the breakage of a yarn end; and
' FIGURE 4 is a schematic control circuit of the herein disclosed stop motion control system.
Looking now to the drawings and especially FIGURE 1 the invention will be described in detail. The yarnll) under tension is successively pulled from the creel (not shown) through the eyelet 12 in the angle iron frame 14 of the drop wire arrangement generally designated 16, through the eyelets 17 of the drop wires 18 and through the comb 20' to the warper 22 driven by motor 24 connected thereto in any suitable manner. As shown clearly in FIGURE 2 the eyelets 12 and 17 will be in alignment 3,330,016 Patented July 11, 1967 when the warper is in operation and theyarn from the creel to the warper 22 is intact.
Looking at the drop wire arrangement 16 and especially FIGURES 2 and 3 it can be seen that the arrangement consists of four basic components. These components are (l) the drop wire lift bar 26, (2) the angle iron frame support 14, (3) the drop wires 18 and (4) the drop Wire switch support 28.
The drop wire lift bar 26 is pivotally secured in any suitable manner to the angle iron frame 14 and is employed to hold the drop wires in the up position in order to thread up the warper. This is accomplished by pivoting the drop wire lift bar to the up position and then hooking the hook 30 of each drop wire 18 over the bar 26. In this position the eyelets 17 of the drop wire 18 will be aligned with the eyelet-s 12 in the frame 14 and yarn 10 can then be threaded therethrough. When the warper is threaded up the bar 26 is lowered and the drop wire 18 will be held in substantially the same position by the yarn 10, as shown in FIGURE 2.
The angle iron frame support member 14 is the main support for the drop wire arrangement 16 and is preferably mounted on the creel. Other suitable locations can be employed within the scope of the invention. To provide a guide for the yarn 10 a plurality of eyelets 12 of plastic, porcelain or other suitable material are lo- 'cated in apertures 32 in the member 14. At least two support plates 34 are bolted or otherwise secured to the member 14 to support the drop wire switch support mem-' rality of U-shaped notches 42 cut therein. The abovementioned plate member 38 is secured to the plastic member 40 by screws 44 to close the open side of the notches 42 to form square holes. Mounted on the top and bottom of the front of the plastic member are bus bars 45 of suitable conductive material which extend across the width of the plastic member 40 to interconnect the hermetically sealed switches 46 soldered or otherwise secured thereto by connection'of the top and bottom copper leads 47, respectively, to the top and bottom bus bars. There will be one switch 46 for each yarn 10 supplied to the warp beam. In the preferred form of the invention both the switch portions 48 within the hermetically sealed enclosure are of ferrous material which can be readily magnetized to attract one another and make contact. It is, of course, within the scope of the invention to have one ferrous switch portion and one nonferrous conductive switch portion and pull one toward the other by magnetism to close the switch.
The fourth main component of the drop wire arrangement 16 is the drop wire 18 which consists of basically of a loop of stiff wire with the hook 30 at one end and with the other end welded, soldered or otherwise secured in a brass tube 50. Located between the hook 30 and the brass tube 50 is eyelet 17 of porcelain, plastic or other suitable material for the reason hereinbefore and hereinafter explained. Suitably secured near the bottom of the brass tube 50 is a magnet 52 for purposes hereinafter explained. As previously set forth the notches 42 in the plastic member 40 are square or rectangular so therefore the tubing 50 is preferably square or rectangular to prevent the rotation of the drop wire in the notches 42. The rotation of the drop wire 18 is undesirable for several reasons in that it places undue stress on the drop wire 18 and it can cause breakage of the yarn 10 due to displacement of the eyelet 17. It should be noted (FIG- URE 2) that when the drop wire 18 is in its most upward position the lower portion of the tubing 50 is not removed from the notch 42. This, of course, insures that the drop wire 18 will be correctly located in the notch 42 upon breakage of the yarn 10.
In normal operation the drop wire arrangement 16 will be as shown in FIGURES 2 and 4 with the yarn running through the aligned eyelets 12 and 17 and the magnet 52 being in the up position so that the switch po rtions 48 will be spaced from one another. The drop wire 18 is held in this position by the yarn 10 engaging the upper inner surface of the eyelet 17 holding it in the up position. Upon the breakage of the yarn 10 the drop wire 18 and magnet 52 will assume the position shown in FIGURE 3. When the yarn 10 breaks, the weight of the drop wire and magnet 52 will cause the drop wire to drop to the position shown. The magnet 52 in this position will cause the switch portions 48 to become magnetized due to the induced field of the magnet thereby causing the switch portions 48 to be attracted to one another closing the switch. Looking now to FIGURE 4 it can be seen that the closing of any two switch portions 48 will energize the coil 54 thereby opening switch 56 which in turn breaks the circuit to the warper motor 24 and stops the warper. When the yarn 10 has been rethreaded and tied the drop wire 18 will then reassume the position shown in FIGURE 2 allowing the switch portions 48 to open thereby allowing the switch 56 to close reestablishing the circuit to the warper motor 24.
The herein disclosed warper stop motion offers many advantages heretofore not avail-able. It is simple in construction and positive in operation. The hermetic construction of the switch prevents the collection of lint and debris on the switch alleviating possible shorts and burn-outs. Further, it greatly increases the service life of the control since there is very little relative movement of the switch portion thereby eliminating metal fatigue of the switch due to constant flexing of the switch portions. Further, since the switch leads are rigidly secured you do not have the failure of the leads due to the movement of same whenever the switch makes or breaks as in the prior art devices.
Although we have described in detail the preferred embodiment of our invention, it is contemplated that many changes may be made without departing from the scope or spirit of our invention and we desire to be limited only by the claims.
That which is claimed is:
1. A stop motion for a textile warping machine having a warp beam, the rotation of which advances a plurality of yarn ends, comprising magnetically operated enclosed switch means under said yarn ends, a drop wire operably associated with each of said yarn ends and held above said switch means by said yarn ends, said drop wires having a magnet attached adjacent the bottom thereof and means attached to said switch means and guiding said magnet to a position adjacent said switch means when one of said yarn ends slackens due to a break in the respective yarn end.
2. The structure of claim 1 wherein said switch means includes a switch for each drop wire.
3. The structure of claim 2 wherein said means attached to said switch means is a block member, said block member having a notch therein for each of said magnets and a plate member closing off said notches to form apertures.
4. The structure of claim 3 wherein said apertures are substantially square.
5. The structure of claim 4 wherein said drop wire portion containing said magnet is substantially square to conform to the shape of said apertures to prevent rotation of said magnet in said apertures.
6. The structure of claim 1 wherein said guiding means includes a means to prevent rotation of said drop wire.
7. The structure of claim 6 wherein said means to prevent rotation of said guiding means is hollow and polygon shaped, said magnet being guided inside said hollow guiding means and being restricted from rotation by said polygon shape.
8. The structure of claim 7 wherein said switches are hermetically enclosed.
9. A stop for a textile warping machine having a warp beam, the rotation of which advances a plurality of yarn ends, comprising a plurality of magnetically 0perated enclosed switches, means mounting said switches below said yarn ends, a drop wire operably associated with each of said yarn ends, said drop wires including a tubular portion adjacent the bottom thereof, a magnet secured in said tubular portion and means operably associated wit-h said switches to guide said drop wires into operative relationship with one of said switches to close same upon the breakage of a yarn end.
10. The structure of claim 9 wherein said means guiding said drop wires is a block member with a plurality of notches therein with one notch for each drop wire and a plate member closing said notches to form apertures to accommodate said tubular portion of said drop wire.
11. The structure of claim 10 wherein said apertures are substantially rectangular.
12. The structure of claim 11 wherein said tubular portion of said drop wire conforms to the shape of said aperture to prevent rotationof said drop wire.
References Cited UNITED STATES PATENTS 2,086,901 7/1937 De Rosa 28-51 2,495,149 1/1950 Taylor 335-405 X 2,596,973 5/1952 Anderson 28-51 2,938,972 5/1960 Bryson 200-6l.18
MERVIN STEIN, Primary Examiner.
L. K. RIMRODT, Examiner.