US2398000A - Manufacture of yarn - Google Patents

Description

V Apn'l 9, 194s. 'M HHN 2,398,000

MANUFACTURE OF YARN Filed Feb. 2, 1944 ATTORNEY.

BY WMM.

Fatented Apr. 9, 1946 UNIT STATES ',r. "il U.

2,398,000 MANUFACTURE (or YARN Malcolm Hain, Montclair, N. J. Application February 2, 1944, Serial No. 520,766

' (ci. isi-13o) Claims.

In my Patent No. 2,197,638 I have set forth a novel mechanism for drawing a `sliver composed of jute or other bast fibers whereby, without the use of gills, the sliver may be brought to proper state for spinning. Given the usual drawing and retaining roll-pairs and a so-called driven roll between such roll-pairs, in that case a pair of freely rotative rolls were held yieldingly urged toward the driven rolls andfree to turn as a pair around an axis parallel with the axis of the driven roll, whereby to coact with the driven roll to exert pressure on the sliver thus to cause bers not actually nipped by the drawing rolls to be held against advance merely by fibers actually so Let I be a part of the frame of the machine.

At 2 and 2a are the drawing rolls, roll 2 being fast'to the shaft 3, and roll 2a having its trunnions resting on guideways Ia of the frame which project toward roll 2 and said roll 2a being held pressing against roll 2 by a lever 4 assumed to carry a weight (not shown) yand fulcrumed in a bracket Ib of the frame, the lever exerting its pressure on the roll through a plunger 5. At S-Sa are the as usual iiuted retaining rolls above the drawing rolls, roll 6 being fast to a shaft 1 and roll 6a being journaled in the forked forward end of a lever 8 fulcrumed in the frame and, due to a weight 9 carried by the lever, serving to press roll Sa against roll 6. Between the drawing and retaining lroll pairs and fast to a shaft I0 is what I herein term a driven roll II against which is made to bear, as will appear, what I term a pressure roll Ila. By usual gearing the rolls 2 and 6 are driven, thus: Shaft 2 being suitably driven, a gear I2 thereon meshes with a gear I3 formed order named, but between the last two pairs through a spout 20, and nally through a grooved guide 2l to and through the cap 22 of the spinning unit.

The bracket 23, clamping member 24, handlever 25 to coact with member 2t to clamp the sliver, the bell-crank lever 26, link 2l and link 28 having a projection 28a under lever t are all substantially the same as in my Patent No. 2,197,638.

Pressure roll IIa is supported by what is in effect a slideway 29a lateral of the driven roll Ii andhere afforded by the upper surfaces of arms of a bifurcated bracket 29 which is a fixed pro jection of a rail Icof the machine frame, said bracket straddling the roll lia, whose trlunnions rest on the slideway, which in this example is pitched downwardly toward roll lI.

. At 3D is a lever having a forked forward endv which straddles rollII and whose forked terminals receive shaft I0 on which such lever is thus fulcrumed. The lever also has what is in effect a slideway 30a here afforded by the under surfaces of its arms which rest on the trunnions of roll IIa, this slideway being here pitched downwardly from roll Ii. Remote from its fulcrum the lever is here bent downward and then rearward, its free end Supportingv a weight 3l. `Link 28 is connected to this lever. The lever may have a sliver guide in the form of a fork 36h. f

)'The surfaces forming, the slideways provide bearings for the pressure roll.

By the gearing shown the drawing rolls 2-2a are rotated at a greater speed than the retaining rolls B-Ba and the roll II of the pair I I-I Ia is rotated at a speed between those of the drawing and retaining rolls.

In operation, with the pressure roll Ila and `lever 30 in the position shown, the rolls II-I Ia coacting to compress the sliver a at a point be tween the drawing and retaining rolls, those fibers of the sliver which are not nipped by the drawing rolls exist compressed by the rolls II-Iha, of which roll II is rotated more slowly than the drawing rolls, and so are held against advance incident merely to such bond as exists between them and those actualy so nipped, wherefore the drawing proceeds uniformly. or without bunching.

If the sliver parts between the drawing rolls and the spinning unit it is desired, as in my said patent, to stop the drawing and consequent-delivery of the sliver. For this purpose, lever 25 is moved toward the dotted position so as to clamp the sliver and retract roll 6a and also lever 30. This leaves only the Weight of roll IIa effective to cause rolls ll--I la to clamp the sliver, wherefore the latter parts as anl incident of the clampy ing, as in my said patent, in convenient proximity to the drawing rolls.

My invention is characterized by including, with a pressure roll having its axis substantially parallel with the axes of the drawing and retaining rolls and the driven roll, members having bearing surfaces engaging thepressure roll and converging from the sliver being drawn and normally holding said pressure roll against the driven roll and one of which members is yieldingly urged toward the other, and one of which members underlies the pressure roll and has its said surface `inclined downwardly.

against the driven roll, all said rolls being ar ranged to maintain the portion of the sliver undergoing draft in upright state and having their axes substantially horizontal, means to rotate one drawing roll and one retaining roll, thev former at the superior speed, and also rotate the driven roll at a speed between those of the latter drawing and retaining rolls, and means normally urging said pressure roll toward the driven'roll.

2. The combination set forth in claim 1 characterized bythe last-named means including a lever fulcrumed in the supportingmeans and engaging the pressure roll.

3. A sliver drawing mechanism including, in combination, supporting mean,.drawing and retaining means including respectively, a pair of drawing rolls and a pair of retaining rolls lour-v naled in the supporting means, the latter pair being above the former pair, a driven roll jour.

naled in said supporting means substantially between said pairs, said supporting means having a slideway lateral of and extending and inclined downwardly toward the driven roll, a pressure roll resting and free to move on -the slideway against the driven roll, means to rotate one drawing roll and one retaining roll, the former at the superior speed, and also rotate the driven roll at a speed between those ofthe latter drawingand retaining rolls, al1 said rolls having their axes substantially parallel, and means, including a lever fulcrumedl in the supporting means and having a slideway engaging the pressure roll and converging toward the first-named slideway in a direction from the driven roll, normally urging said pressure roll toward the driven roll.

4. A sliver, drawing mechanism including, in combination, supporting means, drawing and retaining means including, respectively, a pair of drawing rolls and a pair of retaining rolls journaled in the supporting means, a driven roll journaled in said supporting means substantially beL tween said pairs, said supporting means having a slideway lateral of and extending and incline downwardly toward the driven roll, a pressur roll resting and free to move on the slideway against the driven roll, all said rolls being arranged to maintain the portion of the sliver undergoing draft in upright state and having their 4axes substantially horizontal, means to rotate one drawing roll and one retaining roll, the former at the superior speed, and also rotate the driven roll at a speed between those of the latter draw- 4ing and retaining rolls, means normally urging said pressure roll toward the driven roll, and

means to retract the last-named-means from said driven roll and the other of the retaining rolls from the rst-named retaining roll and simultaneously brake the sliver relatively back of said retaining rolls.

5. Mechanism for drawing sliver including supporting'structure, a pair of drawing rolls, a pair of retaining rolls and a driven roll substantially between said pairs, all saidrolls having their axes substantially parallel, and means to rotate. one drawing roll and one ,retaining roll, the former at the superiorispeed, and also rotate the driven roll at a speed between those of the latter drawing and retaining rolls, said mechanism also including, with a pressure roll having its axis'substantlally parallel with`said axes, members having bearing surfaces engaging the pressure roll and converging from the sliver being drawn and normally holding said pressure roll against the driven roll and one of which members is yieldingly urged toward the other, one member underlying the pressure roll and having its bearing surface inl clined downwardly.

- MALCOLM HAIN.

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