US2538518A - Stop-motion mechanism for thread working machines - Google Patents

Description

Jan. 15, 1951 538,51

MOTION MECHANISM FOR THREAD WORKING MACHINES A. HEIJINK STOP- Filed June 16, 1948 nys raa; r -wmmm flan/we EYMW/I Patented Jan. 16, 1951 u mrlzo "PATENT :o e' ems:

STOP-MO-EIGN MEGHANJSENLFOR? THREAD WORKING MACHINES' ,rA pplicaiionQ lim 1 6, 1948'Q'Seriiil No. 33,262

in the'Netlierlands .Func 17,1947

This invention relates" to stop motiori -mechani'sms'for thread working machines; anii more particularly has for its-object to" provide" an irrrproved device for stopping-a warp-knittingor other'm'achine for working a series of fine delicate threads;upon'breakage' of a thread.

Hitherto devices for" stoppingthread working machinestupon: breakagebfa. thread, have been used, comprising a series of soiicail'led" lamel's through which the individualithreads' arepassed and which upon breakage of. a" thread c'ausethe machine'to be stopped. These'known devices; however, have various disadvantages. such'asthe laborious threading of the individual threads through the Iamels and thegeneration of static electricity by friction on the threads, and in particular they are not adapted "for use with machines for working fine delicate threads, such as rayon and'ithe'likefi'laments, which are liable to be damaged by the continuous frictional contactwith' such lamels duringnormaloperation'.

To eliminate these and other drawbacks the present inventionprovides a device :for the purpose referred to, in which the threadsduring normal operation of the machine remain entirely out ofcontact with any element of such device and uponbreakage are only called upon. to exert a very small force for bringingv about the actuation of the stopping'means'.

Tothis end accordingito the invention there is provided.on.a warpeknittingframe or other machine for working threads, particularly a series of fine delicate threads, a device for stopping such machine upon breakage of a thread, said device comprising means extending along said threads and arranged for creating a continuous stream of air or other gaseous medium transverse to said threads, continuously moving catcher means extending along said threads at one side'thereof, a movable member also extending along said threads at the last mentioned side thereof and in spaced relation thereto and means for stopping said warp-knitting or the like machine, said stooping means being adapted to be actuated by said movable member in response to a movement thereof caused by a broken thread being carried by said stream of air or other gaseous medium against said catcher means and being caught and so moved thereby as to engage and displace said member.

More specifically the aforesaid device comprises a nozzle extending along said threads for continuous y directing a stream of air or other gaseous medium thereon, a continuously rotating .grclaimsa (Cl..66-163')' cardediroller extending along said threads-atv the opposite i side thereof, a' rocking-frame including at least one wire or rod also extending along: said tnre'adsat the last mentioned side'thereofsi and in spa'ced relation-thereto; and electric -stoppingroller to be deflected thereby under tensiorrab'out sa id wi re or rod;

"m le-invention will" behereinafter described with reference to the accompanying drawing in which 7 Figure 1' is a frag-mentary diagrammaticsrde elevation partly in section of'on'e form of'the improved device andFig. Z is a cross sectional view takenorrthe line' II '.II in-Figure- 1.

In Figure 2, 1 represents a series of threads, for instan'c'ethe' warp or awarp 'kni'ttingframe, not shown; Extending along" said series on" one side thereof',' is a'pressure-air conduit shaving a slotshaped nozzle 2""arran'ged" for continuously directing a ribbon-like stream of ai'ron said threads during. operation of th'emachine. Facing said nozzle. is a continuously rotating roller '4 mounted onyce'n'tr'esAll and. driven by a pulley 5 (Figureil) in the direction of the arrow, saidlroll'er also extending along said series of thread's 'but' at the oppositesidethereof and being provided with carding needles 6 or other catcher means, designedrfor co-operation in'a manner to behereinafter described, with a light easily movable rocking-frame extending along the series of threads at the same side thereof as the roller 4. In the embodiment shown, said rocking-frame consists of a rod or tube 1 pivotably supported at its ends on centres and carrying adjacent said ends transverse yokes 8 which are connected together by thin rods or wires 9, I8, the frame being so arranged relative to said carded roller 4,

that the wire 9 extends paral el to and at a relative y small distance from said. carded roller 4, the opposite rod or wire ll! of said rocking-frame being: connected to a small rod H controlling a snring contact l2 for co-oneration with a s cond. ontact 3, said contacts bein arranged in an e ectric circuit containin a re av or other device for contro ling t e power supply to the driving m ans of the machine.

When the machine is in operation and breakage of a thread occurs, a free end of such thread is carried by the stream of air emerging from the nozzle 2 into the path of movement'of the rotating needles 6 to be caught thereby and wound on said roller, thereby causing the thread to be deflected under tension from its normal path, about the wire 9, thus effecting a rocking movement of the frame about the centres 1 in the sense of closing the contacts 12,13 and thereby stopping the machine.

The device described is very sensitive and operates very quickly. It is absolutely reliable and enables the control of a plurality of machines by a single operator, such control, if desired, being aided by a system of acoustic or light signals.

As during normal operation, the threads are not in frictional contact with any element of the device and in case of breakage are only called upon to exert the very small force required to rock the light easily movable frame and to close the electric contacts, which as they only serve to establish a relay-circuit may also be very light, the device is particularly adapted for use in machines working fine delicate threads, for which problem up to now no adequate solution has been proposed.

Although in the above the invention has been described in connection with electrically operated stopping means it will be evident that the invention is not restricted thereto as mechanical means also may be used, provided their operation requires only little force.

What I claim is:

1. Stop means for textile machines and the like operative in response to strand failure, comprising an element normally positioned adjacent a portion of the strand as it is moved along the normal path of travel determined by the machine, said element being bodily movable in a direction transverse to said strand portion, means operable by said movable member, upon movement thereof, to effect stoppage of the machine, a rotatively operated carded member positioned adjacent said strand portion, and means for maintaining a continuous flow of a gaseous medium operative upon strand failure forcibly to move the relaxed portion thereof laterally into engagement with said carded member to be caught and tautened thereby, said carded member being arranged with respect to said movable element so as to cause said tautened strand portion to move said element for operating said stopping means.

2. Stop means for textile machines manipulating a plurality of substantially parallel strands comprising a rocking frame including at least one wire normally positioned to extend adjacent and along a portion of said strands as they move along the normal path of travel determined by the machine, means operable by said rocking frame, upon movement thereof, to effect stoppage of the machine, a rotatively operated carded member positioned adjacent said strand portion and means for maintaining a continuous flow of a gaseous medium operative upon failure of at least one strand forcibly to move the relaxed portion thereof laterally into engagement with said carded member to be caught and tautened thereby, said carded member being arranged with respect to said rocking frame so as to cause said tautened strand portion to rock said frame for operating said stopping means.

3. Stop means for textile machines manipulating a plurality of substantially parallel strands comprising a rocking frame including at least one wire normally positioned to extend adjacent and along a portion of said strands as they move along the normal path of travel determined by the machine, electrically operated means to effect stoppage of the machine, 'a single circuit control switch element adapted to be operated by said rocking frame upon movement thereof to actuate said stopping means, a rotatively operated carded member positioned adjacent" said strand portion, and means for maintaining a continuous flow of a gaseous medium operative upon strand failure forcibly to move the relaxed strand portion laterally into engagement with said carded member to be caught and tautened thereby, said carded member being arranged with respect to said rocking frame, so as to cause said tautened strand portion to move said frame for operating said switch element.

ABRAHAM HEIJID REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country 'Date Great Britain 1897 Number Number

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