US2944302A

US2944302A - Drawing frame control mechanism

Info

Publication number: US2944302A
Application number: US763277A
Authority: US
Inventors: Paul B West
Original assignee: Saco Lowell Shops
Current assignee: Saco Lowell Shops
Priority date: 1958-09-25
Filing date: 1958-09-25
Publication date: 1960-07-12
Anticipated expiration: 1977-07-12

Description

P. B. WEST DRAWING FRAME CONTROL MECHANISM July 12, 1960 Filed Sept. 25, 1958 2,944,302 Patented July 12, 1960 Uni d. Swam -1 f 05 2,944,302 DRAWING FRAME CONTROL MECHANISM Filed Sept. 25, 1958, Ser. No. 763,277

1-Claim. c1. 19-166) This invention relates to textile drawing frames and more particularly to a novel control mechanism associated therewith.

In theconventional drawing frame sliver, under tension produced by the calender rolls, is transferred from the nip'of the last pair of drafting rolls to the trumpet which is adapted to condense the sliver web into a strand and guide it into the bite of the calender rolls. The smooth flow of sliver through the trumpet may be interrupted by obstruction due, for example 'to bunches of waste. carried by the sliver from previous operations or by excessive fly associated with the web. To signal such interruptions trumpet stop motions are frequently. provided.

' A'frequently used type of stop motion includes a counterweighted trumpet. The frictional pull of the sliver passing through the trumpet tends to maintain the trumpet in alower position. -When an obstruction or bungup occurs the sliver strand between the trumpet and calender. roll parts and the counterweighted trumpetrises. This movement, communicated through appropriatelinkage, is utilized to stop the drawing frame. In this type of stop motion sufiicient space must "be provided between the pet relative to the calender rolls therefore is dependent on the length of staple in the sliver and a long staple fiber requires that the trumpet be backed olf from the calender roll a. considerable distance. Under those circumstances the condensing efiect of the trumpet is significantly reduced, with a resulting impairment of the sliverlquality. Other prior art mechanisms include devices which are responsive to the tension on the sliver web. When the web tension changes due to an obstruction at the trumpet the mechanism operates to stop the frame. In general these latter devices may be characterized by their criticality of adjustment and their tmreliability in operation. Accordingly, a principal object of the present invention is to provide a novel and improved sliver control mechanism which is responsive to the improper transfer of the sliver between the drafting element and the trumpet.

Another object of the invention is to provide a drawing frame control mechanism suitable for use with any length of fiber and in which the trumpet may be fixed in position relative to the calender rolls such that the opti mum relationship therebetween may be maintained.

Stillanother object of the invention is to provide a simple trumpet stop motion mechanism adapted to operate independently of the tension on the sliver.

Another and more specific object is to provide control I mechanism comprising a sliver guide adapted to be located to -a narrow passageway above the trumpet 16.

through the trumpet. The enclosure is designed to provide proper aerodynamic characteristics to assist the prop er movement of the sliver in a high speed drafting operation and consists of a base and preferably a cover. The end of the base adjacent the drafting element is pivotally mounted on the drawing frame structure and the opposite end thereof rests on the upper surface of the trumpet which is fixedly positioned relative to the calender rolls. A position responsive mechanism, mounted above the enclosure, is adapted to be actuated upon lifting of the sliver. Such lifting occurs whenthe smooth flow of sliver is disturbed, typically by a bung up" at the trumpet. The signal resulting fromthe actuation of the position responsive device may be utilized to indicate the improper operation of the machine, to stop the operation of the drafting element, or for .other purposes as desired- 'Although the preferred embodiment employs a cover to sliver on the base or by the lifting of the enclosure cover caused thereby. e

Other objects and advantages of the invention will-be understood as the following description of the preferred embodiment of the invention progresses, in conjunction with the drawings, in which: I a g Fig. l is an eleyational view of a portion ofthe drawing frame mechanism showing the .control mechanism according to the preferred embodiment of the invention;

Fig. 2 is. an'elevational view of the control mechanism showing itzin asecond position; and

I With reference to thedrawings, the drafting element of the drawing frame includes, as its output a top roll 10 and bottom roll 12 through the nip of which passes the sliverweb 14. The .web of sliver then is guidedto a trumpet 16' which is disposed above the calendering mechanism 18, in the path of the sliver. ,The trumpet acts to condense the web of sliver intoai strand and guides that strand into the .nip' of twofcalendering'rolls 20 and 22 which is disposeddirectly below the trumpet. The drawing frame associated with the preferred. embodiment is a high speed frame capable of operating at speeds in excess'of 300 feet per minute. sliver web is provided between the drafting element and the trumpet which acts to control the fly and produces a smooth transition from web to strand. The enclosure is substantially triangular in plan view and has a cross section which tapers from a substantial width adjacent the nip of the output rolls of the drafting element down The enclosure comprises a base 26 and a top or cover portion 28. The base has upwardly extending and inwardly turned sides 30which support the cover 28 and cooperate with its downwardly extending sides 32 such that a cornpletely enclosed passageway 'is provided as shown in Fig. 3. The cover 28 is not fastened to the base 26 but merely rests on it. The interior surfaces of the enclosure preferably are smooth, all rough edges being avoided such that the sliver may be easily and efiiciently guided through the transition between the output rolls and the trumpet. It is also preferable that the cover be made from plastic or similar material which is treated to avoid the generation of static electricity. The enclosure is described in detail in my copending application Serial No. 695,118 entitled Sliver Web Support and Cover, filed November 7, 1957, now Patent No. 2,858,577.

A pin 34 projects upwardly from the trumpet 16 and is adapted to prevent the cover from sliding forward onto the floor when it is lifted by an accumulation of An enclosure 24 for the 3, sliver. The upper end of the base 26 is pivotally mounted on the drawing frame structure as and the lower end thereof rests on the trumpet. The lower end of the cover ZEE-has.aflangedportionfiti which also rests on the flat. upper surface 4fiy0f. thetrumpeta The. cover, when liftedby a sliver-accumulation, tendsto pivot upwardly about pin34 asshown in Fig, 2.

A switch 4 2 is mounted. above. the enclosureon. the top clearer cover 44 which is associated with the drafting element. This switchincludes normally open contacts 46. and 48.which. are. adaptedto close an electrical circuit comprising line 50. The switch actuating element, which is responsive to; the position of the enclosure, is

in-.the, formof a lever 52.. The-baseof; the leveris in.

close. proximity to thetop oftthe enclosure structure 24 as shown in Fig. 3 and is positioned such that the switch will be actuated upon anupward movement of the web enclosure cover. That actuation of the switch may be utilized to generate a signal which is transmitted via line 50 to control the. operation ofthe, drawing frame.

Innormal operation the sliver web is fed continuously through the rolls 10,.12andthe enclosure to the trumpet. Should for any reason an excess of iiber accumulate in .the enclosurethe cover'will lift up, pivoting about pin 34 as shown in Fig. 2. This movement will actuate the switch, closing the contacts 46 and 58, and a control signal will be generated which may be utilized to stop the frame or otherwise signal the improper operation.

In some installations it is found unnecessary to use the cover. In these cases when the trumpet becomes plugged sliver accumulates rapidly on the base member 26. Thisbuildup of sliver can of itself serve to actuate switch 42. When the apparatus'is operated without a cover the feel'er or actuating lever is positioned in spaced relationship to the sliver web in normal operation. 7 Thus the sensing structure has no tendencyto distort or otherwise impair fragile sliver webs.

It will be seen that the invention provides a novel textile drawing frame control mechanism which is responsive to the movement of sliver between the drafting element and the trumpet. This" mechanism provides a simple means of supervising the draw frame operation which is adapted to operate promptly upon the occurrence of a hung up andis preferably utilized to immediately stop the operation of the drafting element, thus conserving sliver and facilitating re-establishment of proper operation.

Although, a preferred embodiment of the invention has been shown and described it will be understood that the invention is not intended to be limited thereto or to details thereof and departures may be made therefrom within the spirit and scope of the invention as defined in the following claim.

I claim:

In a textile drawing ;frame;a drafting element comprising a plurality of rolls adapted to form a sliver web, a pairof calender rolls, a trumpet mounted abovesaid calender rolls. and fixedly positioned. relative thereto, said trumpet being. adapted to. guide said .sliver web-into the bite of said calender rolls, a pin member extending upwardly from" said'trumpet; a" sliver web confining enclosure disposed between the lastpair of rolls of said drafting element adjacent the nip thereof and said trumpet, said enclosure having a base member with upstanding side portions and a cover member with depending flange portions adapted to engage saidside-portions. to define a space for guidingthe. reductioniofsaid sliver fromza.

substantially flat web adjacent the output ,of said drafting.

enclosureupon. the occurrence of. an obstruction to the movement of sliver through said trumpet, and control meansincluding-I a switch mounted above Sflld enclosure and having an r actuating lever: depending below said": switchand adjacent said'enclosurezcover, said switch adapted. to be actuatedupon? alifting .of'thecover member such that it-c'ontactssaid lever.

References (lined in' the file of'this patent" UNITED STATES. PATENTS 2,113,988" Kershaw Apr. 12, 1938 2,497,017 Shann Feb. 7; 1950' 2,712,676 Mclntyre- July 12.195 2,799,057 King July- 16,1957

. FOREIGN PATENTS 587,095 Great-Britain; ApruM; 19'47