US2076609A - Drawing mechanism - Google Patents

Description

April 13, 1937. R J, ADAMS 2,076,609

DRAWING MECHANISM Filed June 28, 1935 and spinning frames.

not retarded at all in the old method and are Patented Apr. 13, 1937 PATENT OFFICE DRAWING MECHANISM Robert J. Adams, Thomaston, Ga., assignor of one-half to Julian T. Hightower, Thomaston,

Application June 28, 1935, Serial No. 28,906

2 Claims.

This invention relates to an improved means for drafting of textile fibers and the like which is adapted to be used on drafting machines such as slubbers, intermediates, speeders, jack frames In the drawing out operation of textile fibers, it is very essential that the fibers in the roving should be gripped by the more rapidly revolving front rolls while their tail endsare still in the zone of retardation. This 10 retardation causes a slight momentary tension in the fibers in drafting which causes it to straighten out and lie smooth and fiat in the yarn produced. The ideal would be for each fiber to be retarded to an equal degree with the ordinary draft rolls described in the following specification. This is possible only if all of the fibers in the roving are of the same length. In practice, this condition isnever encountered as all commercial cotton contains a considerable portion of short fibers. These short fibers are plucked through by the front rolls faster than the retarded long fibers. This tends to produce a bunch in the yarn made up of misplaced short '5 fibers and followed by a thin place where the strong fibers should have been. It also tends'to make a fuzzy yarn, as the short fibers are not laid straight by the retarding tension.

If it is attempted to bring the tail ends of the short fibers into the zone of retardation by setting the two lines of rolls closer to each other,

the long fibers are positively gripped by both lines of rolls. As the two lines have different speeds, the fibers must either break or slip through the rolls. In either case the quality of the yarn suffers.

' It is, therefore, an object of this invention to provide a third slip roll which is disposed be tween the front and intermediate rolls, said slip roll being mounted on the central or intermediate bottom roll and resting directly on top of and supported by the sliver or roving which is being drawn out. This roll is not weighted but is revolved by the yarn as it is being passed between the rolls. As has heretofore been stated,

the short staple cotton of which a certain amount is present in all types of long staple cotton, will not reach from the bite of the front rolls to the bite of the intermediate rolls, but by providing a third roll disposed between the front rolls and long fibers in the strand of yarn. This will give top central roll and insert the additional floating roll which can be done at very little expense.

It is still a. further object of this invention to provide an additional top roll, in drawing machinery, which is self-adjusting as to position, the thickness of the sliver, roving or yarn determining the position of this additional top roll.

Some of the objects of the'invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawing, in which:--

Figure l is a vertical sectional View through a set of drawing rolls showing my invention applied thereto;

Figure 2 is a top plan view taken along line 9 2-2 in Figure 1;

Figure 3 is an isometric view of the added floating roll.

Referring more specifically to the drawing, the numeral l0 denotes a roll stand beam which has mounted thereon conventional roll stand I I having rotatably mounted in the upper end there of front or drawing roll l2, intermediate pressure roll l3 and back or feed roll [5. These rolls extend the length of the machine and are fluted and cooperate with top rolls l6, l1 and H! in a drawing out operation of a sliver, roving and the like. Rolls l6, l1 and I8 are loosely confined in the position shown in Figures 1 and 2 by having acap bar l9 at each end thereof, said cap bars having notches 20 in the side thereof, into which the tip portions lfia, Ila and I8a are adapted to fit. The cap bars are connected to each other by a suitable shaft 2| which is pivoted as at 22 to roll stand I I.

It is to be understood that a roll stand II will be disposed at spaced intervals along the top of roll stand beam l0. There are a plurality of sections of top rolls I6, I1 and I8, only one section being shown.

The cap bar is has a portion l9a connected thereto which maintains the upper top rolls IS in position. This member has integral therewith a member I9b which fits in a suitable groove in the lower side of bar IS. The member I9b has a slot I9c in the central portion thereof which is penetrated by a bolt I9d said bolt also penetrating the cap bar I9. When it isdesired to rethe upper end thereof the conventional bearing portion IIa which is secured to portion II by any suitable means such as a bolt 25 penetrat ing the member Ila and a suitableslot 26 in the upper end of roll stand II. Itis of course evident that when the two rear lower rolls I3 and I5 are desired to be adjusted with relation to the front roll I2 that this adjustment can be made by manipulating the bolt 25. o

It is seen that top rolls I1 and I8 have a saddle bar 2! normally bearing down on thecentral portion of these rolls and pressing down upon the upper side of member 2'! is one end of a saddle 28.; The other end of saddle 28V normally rests upon the central portion of the upper-front roll I6. Connected to the central portion of saddle is the conventional stirrup 30 which extends downwardly'and is connected to a lever 3I which lever has one end thereof pivotally secured to a speakman screw 32, said screw 32 being secured to member II. 3| has mounted thereon a weighted member 33 which maintains a constant pressure upon the top rolls I6, I! and I8;

In order to cause the short staple cotton, along with the long staple cotton, which is being worked to be gripped tightly at each end I have provided a floating roll :35 which normally rests upon the intermediate bottom roll I3 and isheld in the position shown by lugs 38 projecting down from the lower side of portion I9a of the cap bar I3." These lugs are normally engaged by the restricted end portions 36 and 3'! on the end of roll 35.-'The strand of roving 40 passes through the rolls I3 and I1.

traverse bar and then passes between the rolls I5 and I8 which are rotating at a constant speed. 'From these rolls it passes between the rolls I3 and I! which are rotating at a faster speed than rolls I5 and. I8 and then the strands pass between the bosses 44 of floating roll '35 and the bottom fluted roll I3. From this point the yarn passes between the front rolls I2 and I6 which are rotating at a still faster rate than Floating roll 35 may be a steel roll or a covered roll, It has sufficient weight in itself to apply the proper pressure to the roving or sliver.

It is evident, by referring to Figure 1, that the bite or the point of tangency of the rolls I3 and I1 is farther away from the bite or point of tangency of the rolls I2 and I 6, than it is from the bite or point of tangency of rolls 35 and I3.

By placing the upper roller I I slightly backwarcllyv The right-hand end of lever,

and I6 to control the long staple fiber, whereas, the bite between rolls I3 and 35 and the bite between the rolls I2 and I6 will control the short staple fiber to keep all of the fibers in perfect alinement,

It is of course evident that this principle and device can be used in slubbers, intermediates,

jack frames and speeders and in, fact in any type of machinery where astrandcr. sliver is being drawn out.

tion; andalthough specific terms have been employed, they'are used in a generic and descrip-' tive sense only, and not for purposes of limitation, the scope of the invention being set forth in the appended claims.

I claim:

, 1. Drawing mechanism for textile slivers, rovings and the like having long and short fibers therein, comprising lower front, intermediate and rear fluted rolls, upper; front, intermediate and rear rolls, means for applying pressure to said upper rolls to press them against the lower rolls,

an additional upper roll mounted between the upper front andintermediate rolls, means for guiding said additional roll for movement towards and away from the lower intermediate roll along a plane normal to the plane passing through the longitudinal axes of the lower rolls, and single means for simultaneously adjusting the guiding means forsaid additional roll along- 10 ,In the drawing and specification there has been set forth a preferred embodiment of the inven-' for applying pressure to the top rolls, to press them towards the lower rolls to thereby confine the sliver passing between the lower and top rolls, an additional relatively heavy steel top .roll mounted for sliding movement between the front and'intermediate top rolls in a plane normal to a plane passing through the longitudinal axes of the bottom rolls, whereby the sliver-is contacted by said additional roll at a point substantially midway between'the point where it is engaged by the intermediate rolls and the front rolls, to effect drafting of both the long and short fibers in the sliver, and single means for adjusting the position of the front top roll and the additional roll at the same time with relation to the intermediate rolls to correlate the points of gripping the sliver on the lower intermediate roll to the lengths 'of the short fibers in the sliver.

ROBERT J .-ADAMS.

Images