US1983413A

US1983413A - Device for twisting textile filamentary material

Info

Publication number: US1983413A
Application number: US694299A
Authority: US
Inventors: Spagnolo Sesto
Original assignee: Pirelli SpA
Current assignee: Pirelli and C SpA
Priority date: 1932-07-26
Filing date: 1933-10-19
Publication date: 1934-12-04
Anticipated expiration: 1951-12-04
Also published as: GB404915A; DE623573C; GB406801A; DE623476C; ES130601A1; FR754298A; FR762556A; BE396358A; NL35948C

Description

Dec. 4, 1934. s. SPAGNOLO 1,983,413

DEVICE FOR TWISTTNG TEXTILE PILAMENTARY MATERIAL Filed Oct. 19, 1935 )VENTORI pointthereon (hereinafter referred to as the Patented Dec. 4, 1934 UNITED STATES DEVICE FOR FILAMEN Sesto Sp s' olo, Milan, Italiana Pire I Claims.

I This invention relates to devices for twisting I and doubling cotton and like royings, slivers,

yarn, strand, cable and like textile filamentary material, :all hereinafter referred to for brevity by'the common denomination yarn".

plurality of yarns fed each from a supply bobbin, cop; cheese or the like carried in the unit, first receive a twist and are then doubled or brought? together in the form of a composite strand whi'ch itself then receives a twist.

The present invention. relates to twisting units of this particular class (hereinafter referred to as twisting units of the class specified) and comprises an improved form of unit characterized by enhanced simplicity of construction and effi- .ciency of operation.

The invention involves the use of the wellknown principle of twisting yarn, according to which the yarn is drawn off a bobbin, cop, cheese or the like (hereinafter referred to for brevitysimplyas a bobbin) on to a rotary flier disposed opposite one end of the bobbin andcoaxially therewith, being received upon this flier at a leading-on point) at or near the rotational axis of the flier and being guided upon the flier to a point thereon at or near the radially outer ex-'- tremity of the flier, from whence the yarn, as the flier rotates, balloons around the bobbin to the radially outer extremity of a second yarn guide disposed eoamally with the first (the flier) 0pposite to the other end of the bobbin and rotatable in unison with the flier, from which extremity in turn the yarn passes upon the second guide to a point thereon at or near the rotational axis of the guide, from whence it passes finally to a take-off element for the twisted product, the flier of the unit being driven by the said second yarn guide through the intermediary of the yarn.

The yarn thus'forms a loop in its passage from the bobbin to the take-off element and in said passage has imparted to it two twists perrevolution of the yarn guide and flier. Twisting units involving the above principle of operation, therefore, will be hereinafter referred to as twisting units of the loop type.

According to the present invention, a twisting unit of the class smcifled comprises a plurality of individual sub-units of the loop type incorporated together in multiple relation in a single compositej unit, in which the sub-units are disposed parallel to one another, the bobbins of the sub-units being stationary therein and the sublli, Milan, Ital Application October 19, 1933, Serial No.

In Italy October 25, 1932 'rwls'rm'or 'rnxmr: may MATERIAL Italy, assignor to Societa units at one end thereof with its axis parallel to the rotational axes of these units and a primary rotary flier disposed co-axially with the primary yarn guide opposite the said assemblage of sub-units at the other end thereof, the multiple-twisted yarns from the sub-units being led on to the primary flier at a point thereon near the rotational axis thereof, and from the outer extremity of this flier, ballooning around the assemblage of sub-units, to the radially outer extremity of the primary yarn guide, thence to a point on this guide near the rotational axis thereof and finally on to a take-off element for the doubled and twisted product.

According to a preferred arrangement, the stationary feed bobbins or the like are conicalended with the end of narrower diameter disposed'towards the leading-on point for the yarn on the flier. Thus,'it is found, with this form of feed bobbin or the like, that the yarn more readily pays off from the stationary bobbin to said leading-on point than from a parallel-sided $31, with consequent lessening of strain on the It is also preferred that the various parts set forth above comprising the improved twisting unit of the invention shall be constructed in an overhung form in which the bobbins, the fliers and the yarn guides of the sub-units are all sup ported from one end only of the sub-unit and the assemblage of sub-units, the primary'flier and the primary yarn guide are also all supported from one end only of the composite unit.

The invention will now be further described with reference to the accompanying, drawing, which illustrates a preferred embodiment by way of example, and in which, Figure 1 is a central longitudinal section through the composite twisting unit according to the invention, and

Figure 2 is a transverse section through the unit on the section line 2-2 of Figure 1.

Like reference characters indicate like parts in the two figures. 1

The composite unit shown comprises three sub-units mounted as a collective assemblage upon an overhung shaft 1, itself supported upon bearings 2 and belt driven through the intermediary of a pulley 3 fast upon the shaft.

Each sub-unit consists of a stationary bobbin carrier 4 mounted, through the intermediary of an anti-friction rotational bearing, upon a rotatable spindle 5, the carrier 4 being adapted to receive upon it a conical bobbin, cop or cheese 6 which is stationary with the carrier. Adjacent the base end of the cheese 6, is a circular dish 7 fast upon spindle 5 and therefore rotatable with it, and a double-ended arm 8 rotatably mounted in a bearing 9, the axis of which is coincident with that of spindle 5, the bearing 9 being incorporated in the outer extremity of a U-shaped bracket 10 swingably hanging at its inner end, along with the bobbin carrier 4, with which it is fast, from the spindle 5. The bracket 10 is weighted with a counterpoise weight 11 which operates yieldingly to control the bracket always to the lowermost position shown and at the same time to hold the bobbin carrier 4 and the cheese 6 thereon against rotation in the unit.

The dish '7 and arm 8 constitute yarn guides, and the guide 8 is arranged to be rotated in unison with guide 7 by the pull of the yarn between the two guides, and with this in view the guide 8 is, as shown, of very light proportions.

Each sub-unit comprises, moreover, the usual tensioner 12 for the yarn and guide ring 13. It may also include any of the usual self-stopping devices. Such are not shown.

The several spindles 5 of the assemblage of sub-units are rotationally mounted in a triangular hollow carrier 151, which, in turn, is mounted upon one end of a sleeve 15 surrounding the overhanging portion of driving shaft 1 and, in turn, mounted thereon through the intermediary of anti-friction bearings 16, 1'? at the two ends respectively of the sleeve. This sleeve 15 is weighted against rotation upon shaft 1 by a counterpoise weight 18 depending from the inner end of the sleeve, the magnitude of this weight being such as to retain the whole assem-w blage of sub-units upon the shaft 1 yieldingly against rotation thereon.

The spindles 5 of the sub-units are drivingly connected with the shaft 1 through the intermediary of pinions 19, fast upon the spindles 5 and intermeshing with a central toothed Wheel 20 fast upon the outer extremity of the shaft 1.

The composite unit further comprises a circul ar dish 21 fast upon the shaft so as to be rotatable with it, and a double-ended arm 22 rotatably mounted upon a bearing 23 carried upon a bracket 24 afiixed to the carrier 14. The dish 21 and arm 22 constitute, as in the case of the dish '7 and arm 8 of the sub-units, yarn guides and the guide 22 is arranged to be rotated by the dish 21 through the pull of the yarn extending between the two guides.

The guides 8 of the sub-units are formed at the endswith eyes 25 through either of which the yarn may be threaded, and each dish '7 is" formed with an entry passage 26 for the yarn, this passage being situated at the periphery of the dish and being of such a form as to guide the yarn with the least degree of obstruction to its movement relatively to the dish, and an issue passage 27 extending radially of the dish through the central boss thereof and leading to an axialpassage 28 provided for the yarn through the spindle 5.

Similarly, the arm 22 is formed with an eye 29 at each end and the dish 21 has in its periphery a diametrically opposed pair of entry passages 30 for the yarn and extending radially through its central boss an issue passage 31 for the yarn, said issue passage communicating with an axial passage 32 for the yarn in the shaft 1,

.The yarn from the cheese 6 of each sub-unit is fed to the flier 8 of the sub-unit via the tensioner 12, from which the yarn passes through an axial passage in thebearing 9, thenradially outward to the eye 25, then back to the entry passage 26 of guide '7, from thence inwardly to the issue passage 27, along the axial passage 28 in spindle 5, thence to a doubling eye 33 and tensioner 34 (both of these elements being supported on the aforesaid bracket 24), from the tensioner 34 through an axial passage in bearing 23, from the outlet end of this passage through an eye 35 formed in guide 22 through eye 29 of said guide, across to eye 30 of guide 21, inwardly through issue passage 31 of said guide 19, along axial passage 32 of shaft 1 and finally on to a take-off roller 36.

As will be appreciated, with this arrangement, the yarn passing between the guides '7, 8 of the sub-units and

guides

21, 22, balloons out as shown, and in order to prevent the ballooning yarn on the sub-units from conflicting with that ballooning between the

yarn guides

22, 21, each sub-unit comprises, in addition to the parts already enumerated, a circular guard ring 37 mounted upon the bracket 10, and the yarn passing between the sub-unit guides '7, 8 balloons between this ring 3'7 and a larger ring 38 completely encircling the assemblage of sub-units and intervening between the ballooning yarn on the sub-units and that passing between the

yarn guides

22, 21, the said ring 38 being mounted upon an arm 39 projecting axially of the unit from the lower end of the counterpoise weight 18.

In the actual form .of the improved twisting unit shown, the gear ratio of the pinions 19 to the central toothed wheel 20 is 1:2, and consequently, for each revolution of the driving shaft 1, the spindles 5 rotate through two revolutions, and therefore, per revolution of said driving shaft, the yarn from each bobbin of the composite unit receives four revolutions of twist from the time it leaves the bobbin to the time it reaches the doubling eye 33 and in the result each yarn receives six revolutions of twist per revolution of the driving shaft between the bobbin and the take-off element 36, four of these revolutions of twist being applied prior to doubling and two after.

Obviously, however, the gear ratio of the spindles 5 to the wheel 20 may be any other desired ratio than 1:2, with corresponding variation of the number of revolutions of twist applied to the individual yarns.

The improved construction of composite twist-- ing unit provided in accordance with this invention, more particularly the specific form of such construction described above with reference to the accompanying drawing, has been found to be highly meritorious both from the point of view 'of ease of initial threading and facility of use generally and also from the standpoint of efliciency of operation, the twisted and doubled product producible with the improved unit being of highly uniform character and quality. Moreover, the improved construction has been found to make for maximum avoidance of breakages both of the yarn in course of twisting and doubling in the unit and also of the rapidly rotating parts'of the unit.

What I claim and desire to secure by Letters Patent of the United States is:

1. In a twisting unit of the class specified, a plurality of individual sub-units of the loop type herein specified incorporated together in multiple driven primary yarn guide disposed opposite to the assemblage of sub-units at one end thereof with its axis parallel to the rotational axes of these'units and a primary rotary flier disposed co-ra'x'ially with the primary yarn guide oppo-' site the said assemblage of sub-units at the other end thereof, the multiple-twisted yarns from the sub-units being led on to the primary flier at a point thereon near the rotational axis thereof, and from the outer extremity of this flier, ballooning around the assemblage of subunits, to the radially outer extremity of the primary' yarn guide, thence to a point on this guide near the rotational axis thereof and finally on to a take-off element for the doubled and twisted I product.

2. In a twisting umt of the class specified, the parts set forth in claim 1, in a form in which the'bobbins are conical-ended with an end of narrower diameter disposed towards the leadingori point for the yarn on the fiier.

' 3, In a twisting unit of the class specified, the partsset forth in claim 1', in an overhung form in which the bobbins, the fliers and the yarn guides of the loop type sub-units are all supported from one end only of the sub-unit and the assemblage of sub-units, the primary flier.

of the composite unit.

5. In a twisting unit of the class specified, the

' parts set forth in claim 1, in an overhung form in which the bobbins, the fliers and the yarn guides of the loop type sub-units are all supported from one end only of the sub-unit and the assemblage of sub-units, the primary flier and the primary yarn guide are also all supported from one end only of the composite unit, the arrangement being such that the twisted and doubled product issues from the supported end of the composite unit, and the fliers of the subunits being rotationally mounted upon the outer end of a weighted U-shaped bracket accommodating the bobbin within its bend and freely mounted at its inner end upon a stationary carrier for the sub-units.

6. In a twisting unit of the class specified, the parts set forth in claim 1, in a form in which the several loop type sub-units and the stationary carrier are mounted through the intermediary of anti friction' rotational bearings upon an overhung driving shaft, the yarn guides of the subunits being mounted upon spindles which are supported in bearings in the carrier and are drivingly connected to the said shaft through the intermediary of a toothed wheel fast on the extremity of said shaft and in mesh with pinions on the spindles.

7. In a twisting unit of the class specified, the parts set forth in claim 1, in an overhung form in which the bobbins, the fliers and the yarn guide of the loop type sub-units are all supported from one end only of the sub-unit, and the assemblage of sub-units, the primary flier and the primary yam guide are also all supported from one end only of the composite unit, the fliers of the sub-units are rotationally mounted upon the outer end of a weighted U-shaped bracket accommodating the bobbin within its bend and freely mounted at the other end upon a spindle which is rotational in bearings in the stationary carrier, the said carrier is mounted through the intermediary of anti-friction bearings upon an overhung driving shaft and is weighted to hang stationary thereon and said shaft is drivingly connected to the spindle of the sub-units through the intermediary of a toothed wheel fast on the extremity of the shaft and in mesh with pinions on the spindles.

sEs'ro SPAGNOLHOJZ."