US1428271A

US1428271A - Drawing mechanism

Info

Publication number: US1428271A
Application number: US445921A
Authority: US
Inventors: Butler Arthur Cecil
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-02-18
Filing date: 1921-02-18
Publication date: 1922-09-05
Anticipated expiration: 1939-09-05

Description

A.,C. BUTLER.

DRAWING MECHANISM.

APPLICATION FILED FEB. Ia, I92I.

1,428,271, Patenasept; 5,1922.

IIIIIIIIIH III IEII- IIIIIIIIII II IllIIII Patented Sept. 5,l 1922. p i

UNlTED STATES ARTHUR CECIL BUTLER, OF BOSTON, `MASSACHUSETTS DRAWING MECHANISM.

Application led February 18, 1921. Serial No. 445,921.

`To all 'wlw/nt it may concern.'

Be it known that I, ARTHUR CEOIL BUTLER,

a subject ofthe King of Great Britain, residing at Boston, in the county of Suffolk andv State of Massachusetts, have invented new and useful Improvements in Drawing Mechanism, of which the following is a specicatio This invention v relates to apparatus for the drawing of wool, cotton or other fibrous material. While my object is to provide mechanism for drawing out'long fibers of wool such as used in the manufacture of worsted yarns, neverthelessit may be effectively used in the drawing of roving composed of lrelatively short fibers such as is the manufacture of moreno yarns wherein a mixture of wool and cotton are used, or in the drawing of rovings formed of relatively short cotton staple.-

The object of the invention is to provide for a greater draft or attenuation of the roving at one operation than can at present be obtained without the production of un- I both in the-English or Bradford, and the even roving; that is, yarn which varies ntermittently in its bulk or diameter. In' fact, the invention (as will be explained) is applicable for drawing yarns or rovings French systems. Ordinarily, in the Braolford system of drawing, as well as in the Bradford spinning frame, three, four or more lines or sets of drawing rollers are port the roving while it is being drawn outbetween the front and back lines or pairs of rolls. The top intermediate rolls are light,

and usually self-weighted, and the fibers,

when seized by the front pair of rolls, are drawn from beneath them.'

According to my invention, I may substitute for all or some of the intermediate top rolls a gravity cap which rests upon the rolls therebeneath, and permits the fibers to be drawn out evenly and the roving or yarn to become attenuated without the formation of thin or weak spots. This cap rests loosely on at least two rolls, although it may be so arranged as to engage the roving over only one of the rolls on which it rests. The cap ,is relatively light, beingof sufficient weight, however, to cause thevroving or the sliver, as the case'may be, to be frictionally engaged by the rolls upon which it rests. What may be termed the rear endof the cap is so curved or hooked as to be maintained in position by the roll on which the said rear end rests, and its front end is curved more or less to approximate the curvature of the roll upon which it in turn rests. Each cap may be'of sufficient width for the engagement of a single roving or sliver, or it maybe wide enough toengage several, all

as may be desired. Preferably the capI is provided intermediate of its ends with a guide for the roving passing'beneath it, and this guide may be so formed as to act as a. condenser for concentrating the roving or sliver being attenuated or drawn. Since the rear end of the cap is so formed as to take over and rest upon the bottom roll, it is preferably provided with a slot or opening through which the roving or sliver passes to engagement with the bottom roll upon which the rear end of the cap rests. A.The cap, being supported by rotating rolls, may be easily moved laterally by the lateral movement of the sliver or roving under the Aimpulse of the usual traverse bar in the rear of the lines or pairs of rolls, the cap being sulliciently light toy permit its lateral movement without danger of breaking the sliver or rovmg. p

On the accompanying drawings,-

Figure 1 represents in end elevation, a

roll stand embodyingtlie invention.

upside-down to show the condensing guides which are located intermediate its ends.

Figure 7 illustrates another form of cap in which the forward end is provided with a spring member.

Referring first to Figures 1 and 2, the roll stand 10 is provided with the front top and bottom rolls 11 and 12, and the

rear rolls

13 and 14. l have illustrated two

intermediate bottom rolls

15, 16, with which may be employed a cap such as I have described. At 17 there is indicated a traverse bar. through which the sliver or roving a' is passed previous to its being gripped between the

rear rolls

13, 14. rllhe intermediate roll 15 is shown as being somewhat larger in diameter than the intermediate roll 16, this not being essential although at times desirable, as will be well understood by those skilled in the art. rlhat is to say, where a relatively long staple is employed in the formation of the sliver or roving, I employ a relatively large roll 15; whereas, when the sliver is formed of relatively short staple, such as cotton or cotton waste, l may use a relatively small roll as at 15. The cap is indicated at 18. llt consists of al plate, preferably of metal or other material of relatively high gravity; and, at what I may term its rear end, it is curved as at 19 so as to hook more or less loosely around the roll 16. lts front end 20 is curved to conform to the periphery of the roll 15 upon which it rests by gravity, and towards and from which it may move by a pivotal action about the axis of the roll 16. Preferably the lines of rolls on the roll stand are set at an angle to the horizontal as shown, so that the cap 18 will hang forwardly and downwardly. At its rear curved end 19, the cap is provided with a converging slot 21, through which the roving or sliver a may pass from the

rolls

13 and 14 into engagement with the roll 16,-and likewise at its front end the cap may be provided with a converging slot 22 through which the roving or sliver may emerge from the roll 15 on its way to the front drawing rolls 11 and 12. Between its' ends and on its under side the cap is preferably provided with a guide for the roving, which Preferably takes such form as will serve to condense and frictionally engage the roving or sliver passing through it. rlhis guide comprises two forwardly-converging

lugs

23, 23, the confronting faces of which may be arcuate or conveXly curved as illust-rated in Figure 6." As the traverse bar 17 is reciprocated lono'itudinally of the axes of the rolls for t e purpose of causing lateral traverse of the roving or sliver, the engagiemlent of the roving with the front, rear and

intermediate guides

21, 22, 23 of the cap cause the cap to move laterally with it.

1t will be observed that, by the construction which ll have thus described, the roving or sliver is positively gripped only by the front and rear pairs of rolls bet-Ween which the actual drawing or attenuation of the roving or sliver takes place. ln this case, the roving is supported between these rolls by the

intermediate rolls

15 and 16, with which it is lightly maintained in contact by the cap, thereby ensuring the even and uniform attenuation of the roving.

lin Fignre3, l have illustrated another embodiment of the invention in which, between the front and

rear rolls

11, 12, 13, 14, l have provided four

lower rolls

24, 25, 26 and 27. For the two rolls 26 `and 27, l employ a cap 28 substantially -similar to that at 18. l have illustrated a top roll 29 as being associated with the intermediate roll 25, and a cap 30 engaged with the roll 25 and having it-s front end associated with the larger intermediate roll 24. ln this case, the recess or slot at the rear end of the cap 30 is wide enough to receive therein the roll 29 and to permit the necessary traverse motion of the cap in reference to the roll 29.

rolls

11, 12, 13 and 14, ll have provided three intermediate rolls 31, 32 and 33, with all three of which there is engaged a single cap 34. ln this case the rear curved end of the cap engages t-he roll 31 and the front curved end engages the roll 33. rThe intermediate portion of the cap is tangential to the roll 32, or, if desired, it may be slightly concave so as to conform to the convex curvature of the roll 32 without departing from the spirit of the invention. By making this intermediate portion of the cap concave, ll increase the frictional engagement of the roving with the roll 32. llhe cap 34 may be provided with two

guides

35, 36, on its under side, similar to those formed by the lugs 23, 2a.

1f desired, the front end of the cap may be provided with a spring member 37, as illustrated in Figure 7 rlhis spring member may be formed of a leaf spring of thin metal which will yield under light pressure. The forward curved end of the main body of the cap, which overhangs this spring, limits the extent to which it may move and also serves to protect it against injury.

1 have not illustrated the mechanism by which all of the various bottom rolls are rotated at the proper speeds, nor the mechanism for reciprocating the traverse bar, as such mechanism is well known, and, per se, forms no part of the present invention.

@ne of the functions performed by what for convenience l have termed the roving guide, formed by the lugs 23, is that of frictionally engaging' the roving and retardin the loose ibers which are not yet gripped by the front pair of rolls, so that they are not too freely pulled along by those 90 ln Figure 4, between the front and rear f fibers which are gripped by said rolls. Instead of the particular form of guide which I have shown, any other form which will serve the purpose may be employed.

Vhat I claim is l. A drawing mechanism comprising bottom rolls, and a gravity cap hung upon one of said rolls and resting loosely upon the other roll and under which the roving passes.

2. A drawing mechanism comprising front and rear pairs of top and bottom rolls, a plurality of intermediate bottom rolls, and a gravity cap resting loosely upon said intermediate rolls and under which the roving passes.

3. A drawing mechanism comprising bottom rolls, and a gravity cap hung upon one of said rolls and resting loosely upon the other roll and under which the roving passes, said cap having a roving guide on its under face intermediate said rolls.

4. A drawing mechanism comprising spaced bottom rolls, and a gravity cap resting on and supported entirely by said rolls to press the roving thereagainst, said cap having one end curved to embrace one of said rolls and having its free end resting loosel on the other roll.

5. A drawing mechanism comprising spaced bottom rolls, and a gra\ ity cap resting on and supported entirely by said rolls to press the roving thereagainst, said cap having one end curved to embrace one of said rolls and having its free end resting loosely on the other roll, said cap having a roving guide onits under face intermediate its ends.

to press thevroving thereagainst, said cap having one end curved to embrace one of said rolls and having its free end resting loosely on the other roll,- said cap having a guide in said curved end to receive the roving.

8. A drawing mechanism comprising spaced bottom rolls, and a gravity cap resting on and supportedentirely by said rolls to press the roving thereagainst, said cap having one end curved to embrace one of said rolls and having its free end resting loosely on the other roll, said cap having guides at each end for the roving.

9.IA drawing mechanism comprising a traverse bar, spaced bottom rolls, and a cap resting upon and supported entirely by said rolls, and at one end embracing one of said rolls, said cap having a roving guide for causing the roving to pass between said cap and said rolls, the parts being so related that the lateral movement of the roving by the traverse bar causes the said cap to move laterally therewith.

In testimony whereof I have affixed my signature.

l ARTHUR CEGIL BUTLER.