GB1593448A

GB1593448A - Apparatus for spinning textile fibres

Info

Publication number: GB1593448A
Application number: GB10745/78A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1977-04-27
Filing date: 1978-03-17
Publication date: 1981-07-15
Also published as: PL108958B1; FR2388904A1; CH626664A5; IT7812516A0; PL205324A1; JPS53134938A; DE7806318U1; SE433627B; ATA293177A; AT345701B; BE865720A; CS198288B2; ES468398A1; CA1061202A; SE7803028L; IT1103179B; DE2809000A1; HU184086B; JPS575887B2; DD135220A5

Abstract

The apparatus has a rotating drum (2) as a lathe-turned body. A second lathe-turned body co-operates with this drum (2), to form a gusset, and is preferably likewise designed as a rotating drum (2). At least one of the drums (2) or one of the lathe-turned bodies possesses a suction zone (4) located in the gusset region. A yarn core (9) runs through the gusset region in the longitudinal direction of the drums to a pair of draw-off rollers (5). This yarn core (9) consists of a fibre roving and is guided through a drawing unit (6, 7, 8) directly in front of the drums (2) or lathe-turned bodies. The drawing unit (6, 7, 8) prevents the fibre roving (9) from rotating about its axis. The fibres are introduced on the fly into the gusset between the two drums (2) or lathe-turned bodies and there they are rotated about the yarn core or fibre roving (9). <IMAGE>

Description

(54) APPARATUS FOR SPINNING TEXTILE FIBRES (71) I, ERNST FEHRER, an Austrian Citizen, of Auf der Gugl 28, At020 Linz, Austria, do hereby the invention for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to apparatus for spinning textile fibres about a yarn core.

The yarn core which is used in high tenacity yarns consists, as a rule of an endless filament or of a previously existing yam.

Whereas the use of such yarn core increases the tenacity of the yarn product, it results in a final yarn having a changed structure, which is sometimes not desired, and/or precludes the production of very fine yarn products. Whereas a silver might be used as a yarn core, this would also result in comparatively thick yarns because the silver which is normally available has a weight of at least Nm 1 or 2 and for this reason is large in diameter. (Nm is the "metric number" that is to say the ratio between the yarn length and the yarn weight generally expressed in km/kg or mm/mg hence a value of Nm. 2 means, for example, that the yarn has a weight of lkg for a 2km length).

A silver can be drawn out to a large extent but must be twisted as it is drawn out because it cannot be transported when it has been drawn out but has not been twisted.

According to the present invention I provide apparatus for spinning textile fibres comprising a rotary drum that constitutes a first twisting member and a rotary second twisting member juxtaposed with said rotary drum to define a tapering space, at least one of said twisting members having a suction zone adjoining said space, and means for introducing said textile fibres in a flying state into said tapering space to be twisted therein about a yarn core in the form of a silver that is in contact with said first and second twisting members and that extends through' said space in the longitudinal direction of the rotary drum to a pair of withdrawing rollers, characterized in that said first and second twisting members are directly preceded in a line of draw by a draw frame for drawing out said silver and for holding it against rotation.

The silver is thus drawn out directly before the two twisting members so that the silver can be drawn out to twenty to forty times its original length and can then be delivered at a speed up to or above three hundred metres per minute and such operation will not effect the coherence of the drawn-out silver because the latter is immediately wrapped in the tapering space between the two twisting members with the fibres flying into said space. Both twisting members may consists of suction drums. Alternatively, one twisting member may consist of a rotary disc.

It is not necessary to provide each twisting member with suction means. It will be ap parent that the high speed of operation of the draw frame permits also of a withdrawal of the yarn product at high speed and that the high draw ratio permits of a manufacture even of very thin yarns.

Because the drawn-out silver is held against rotation in the draw frame as well as by the pair of withdrawing rollers but between the two twisting members is twisted together with the flying fibres which are supplied, this operation might be considered as a mere false twisting. Surprisingly it has been found that the silver fibres retain the twist imparted to them by the two twisting members in front of the draw frame in the line of the draw because the individual fibres which fly into the tapering space and are then wound around the silver fibres prevent an untwisting of the latter between the twisting members and the pair of withdrawing rollers.The resulting yarn thus has an optimum tenacity as its core consists of draw-out fibres which extend sub stantially in the longitudinal direction of the yarn and is provided with a suitable covering and it is possible to make even fluffy yarns which in spite of a low twist have an adequate strength.

It is known that fibres which are more highly parallel and have been drawn out to a larger extent are required in the manu facture of yarns which are to be spun to a higher fineness number. Besides a yarn having a high fineness number should be highly uniform as regards the number of individual fibres in successive cross-sections as the ab solute number of fibres is the cross-section decreases as the fineness of the yarn is in- creased. Because the silver is drawn out, the apparatus of the invention permits of a manufacture of yarns having high fineness numbers up to and above Nm 80 as the requirements explained hereinbefore are fulfilled.

Whereas the apparatus according to the invention can be used to spin yarn at a yarn speed of three hundred metres per minute, in accordance with the speed of the drawn frame, modern ring spinning frames operate at yarn speeds up to forty metres per minute and modern rotor spinning machines when producing fine yarns having fineness numbers above about Nm 20 operate at eighty to one hundred metres per minute and can be used only up to about Nm 40.

The invention will be more fully understood from the following description given by way of example only with reference to the figures of the accompanying drawings, in which: Figure 1 is a transverse sectional view showing part of a spinning apparatus viewed in a plane that is normal to the yarn being formed, and Figure 2 is a side elevation showing the apparatus of Figure 1 with entry ducting removed for clarity.

Fibres shown diagrammatically at F1 fly freely from a serrated carding drum 1 via entry ducting 1A into a tapering space 4 between two twisting members, which consist of two juxtaposed suction drums 21, 22 rotating in the same sense as shown by the arrows. Two suction inserts 31, 32 provided in their respective suction drums 2,, 22 define suction zones, which adjoin the tapering space and face each other. A pair of rollers 5 for withdrawing yarn being formed is provided at one end of the suction drums 2" 22 and hold the yarn against rotation. At that end which is opposite to the pair of rollers 5, the suction drums 2,, 2. are directly preceded in the line of draw AA1 by a draw frame shown generally at D, which consists of pairs of rollers 6, 7 and 8.To produce a draft, the rollers 6, 7 and 8 are rotated at speeds which increase from each pair to the next. A silver 9 (Figure 2) is fed through an eyelet 10 to the draw frameD which holds it against rotation and is drawn out by said frame to twenty to forty times its original length. The silver that is so drawn out is moved through the tapering space 4 between the suction drums 2,, 22 to the pair of withdrawing rollers 5 and by means of the suction drums 21, 22 is twisted and is wrapped with the flying fibres delivered by the carding drum 1. These fibres prevent false twisting that would otherwise result.

WHAT I CLAIM IS: 1. Apparatus for spinning textile fibres comprising a rotary drum that constitutes a first twisting member and a rotary second twisting member juxtaposed with said rotary drum to define a tapering space, at least one of said twisting members having a suction zone adjoining said space, and means for introducing said textile fibres in a flying state into said tapering space to be twisted therein about a yarn core in the form of a silver that is in contact with said first and second twisting members and that extends through said space in the longitudinal direction of the rotary drum to a pair of withdrawing rollers, characterized in that said first and second twisting members are directly preceded in a line of draw by a draw frame for drawing out said silver and for holding it against rotation.

2. Apparatus for spinning textile fibres, constructed and arranged substantially as described hereinbefore and as shown in the figures of the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. facture of yarns which are to be spun to a higher fineness number. Besides a yarn having a high fineness number should be highly uniform as regards the number of individual fibres in successive cross-sections as the ab solute number of fibres is the cross-section decreases as the fineness of the yarn is in- creased. Because the silver is drawn out, the apparatus of the invention permits of a manufacture of yarns having high fineness numbers up to and above Nm 80 as the requirements explained hereinbefore are fulfilled. Whereas the apparatus according to the invention can be used to spin yarn at a yarn speed of three hundred metres per minute, in accordance with the speed of the drawn frame, modern ring spinning frames operate at yarn speeds up to forty metres per minute and modern rotor spinning machines when producing fine yarns having fineness numbers above about Nm 20 operate at eighty to one hundred metres per minute and can be used only up to about Nm 40. The invention will be more fully understood from the following description given by way of example only with reference to the figures of the accompanying drawings, in which: Figure 1 is a transverse sectional view showing part of a spinning apparatus viewed in a plane that is normal to the yarn being formed, and Figure 2 is a side elevation showing the apparatus of Figure 1 with entry ducting removed for clarity. Fibres shown diagrammatically at F1 fly freely from a serrated carding drum 1 via entry ducting 1A into a tapering space 4 between two twisting members, which consist of two juxtaposed suction drums 21, 22 rotating in the same sense as shown by the arrows. Two suction inserts 31, 32 provided in their respective suction drums 2,, 22 define suction zones, which adjoin the tapering space and face each other. A pair of rollers 5 for withdrawing yarn being formed is provided at one end of the suction drums 2" 22 and hold the yarn against rotation. At that end which is opposite to the pair of rollers 5, the suction drums 2,, 2. are directly preceded in the line of draw AA1 by a draw frame shown generally at D, which consists of pairs of rollers 6, 7 and 8.To produce a draft, the rollers 6, 7 and 8 are rotated at speeds which increase from each pair to the next. A silver 9 (Figure 2) is fed through an eyelet 10 to the draw frameD which holds it against rotation and is drawn out by said frame to twenty to forty times its original length. The silver that is so drawn out is moved through the tapering space 4 between the suction drums 2,, 22 to the pair of withdrawing rollers 5 and by means of the suction drums 21, 22 is twisted and is wrapped with the flying fibres delivered by the carding drum 1. These fibres prevent false twisting that would otherwise result. WHAT I CLAIM IS:

1. Apparatus for spinning textile fibres comprising a rotary drum that constitutes a first twisting member and a rotary second twisting member juxtaposed with said rotary drum to define a tapering space, at least one of said twisting members having a suction zone adjoining said space, and means for introducing said textile fibres in a flying state into said tapering space to be twisted therein about a yarn core in the form of a silver that is in contact with said first and second twisting members and that extends through said space in the longitudinal direction of the rotary drum to a pair of withdrawing rollers, characterized in that said first and second twisting members are directly preceded in a line of draw by a draw frame for drawing out said silver and for holding it against rotation.