Title of Invention

SPINNING FRAME

Abstract The invention relates to a spinning frame, in particular a ring spinning frame, with a multiplicity of spinning units each comprising a drafting unit (11) followed by a condensing zone (12) which comprises a rotary movable condensing element, in particular a sieve drum (13), with pneumatic suction means on which rests the output pressure roller (14) of the drafting unit (11) and at an angular distance from it a twist blocking roller (15, 15"). The invention is based on the fact that the axis of rotation (18, 18") of the twist blocking roller (15, 15") with the axis of rotation (19, 19") of the condensing element (13) comprises an angle (a, P) that deviates from 0. Fig. 1
Full Text

The invention relates to a spinning frame, in particular a ring spinning frame, with a multiplicity of spinning units each comprising a drafting unit followed by a condensing zone which comprises a rotary movable condensing element, in particular a sieve drum, with pneumatic suction means on which rests the output pressure roller of the drafting unit and in an angular distance from it a twist blocking roller.
Such a spinning frame is for instance known from (DE 199 40 817.3).
Through a lowered circumferential speed of the twist blocking roller in relation to the circumferential speed of the sieve drum a specific compression and/or relaxation of the fibres can be reached in particular at the end of the condensing zone which favours the condensing of rovings which consist in particular of chemical fibres.
The invention aims to provide a further spinning frame of the type initially specified, with which, in particular at the end of the condensing zone, such an axial compression of the roving can be obtained, that inspite of the condensation of problematic fibres as in particular chemical fibres, these can be processed perfectly. In addition the needs for the reduction of the transportation speed of the roving within the area of the twist blocking roller and before it is to be reduced substantially.
The task as an object of the invention is solved according to the features that the axis of rotation of the twist blocking roller and the axis of rotation of the condensing element run diagonally to each other, i.e. comprises an angle (a, p) that deviates from 0 ,
According to the invention it is thus important that the axis of rotation of the twist blocking roller and the axis of rotation of the condensing element do not run parallel to each other.
The idea of the invention is thus to be seen in the feature to cause a reduction of the circumferential speed of the twist blocking roller in a very simple manner, that is, by only slightly tilting the twist blocking roller. Between the surfaces of the sieve drum and the twist blocking roller a slip develops which depends on the size of the angle so that the roving being transported between the condensing element and the twist blocking roller attains an average speed that is, a speed that is between the circumferential speed of the sieve drum and the speed of the twist blocking roller.

Tilting of the twist blocking roller preferably takes place i.e., that the tilting of the twist blocking roller takes place by the radius of the sieve drum within the area of the point of contact of the sieve drum and the twist blocking roller. Thereby the circumferential speed of the twist blocking roller is reduced by a factor which corresponds with the cosine of the tilting angle.
Thereby the generating line of the twist blocking roller can be straight-lined as described herein.
In order to obtain a longer nip line, an embodiment as described herein is favourable.
The tilting of the twist blocking roller can also take place as described herein, for this it is suitably designed as described herein.
Preferential angle ranges are specified herein.
The material for the twist blocking roller is preferably selected as described herein, in such a way that the twist blocking roller has a relatively hard outer surface.
Preferable, however, the design as described herein, since thereby the roving is led across a longer path between the sieve drum and the twist blocking roller and also the slip between the sieve drum and the twist blocking roller does not have unfavourable effects on the roving. This embodiment is particularly of advantage with a design of the twist blocking roller as described herein.
In the following the object of the invention is described more closely by the example according to the accompanying drawing, wherein show,
Figure 1 a schematic side view of a spinning unit of a ring spinning frame according to the invention, seen in the direction of arrow I in figure 2,

Figure 2 a view in direction of the arrow II in figure 1, whereby as part of the drafting unit only the sieve drum is illustrated, and
Figure 3 a schematic view of a further favourable embodiment essentially seen in direction III of figure 1.
According to figure 1 a roving 17 is introduced between the pair of entrance rollers 22 of a drafting unit 11, in order to be led from there through the pre-drawing area 23 to a further pair of rollers 24 which co-operates with the aprons 25, at whose exit the roving is being led into the output gap of the drafting unit 11 which is formed between a sieve drum 13 and an output pressure roller 14. The main drawing area 34 is located between the output gap of the aprons 25 and the contact line of the output pressure roller 14 and the sieve drum 13. Inside, along the inner surface of the sieve drum 13, over a certain angle range, a suction box 27 extends which is connected with a suction pipe 26. At its outer circumference, extending in circumferential direction, said suction box 27 comprises a suction slot 28 (figure 2), whereby, the holes 29 of the sieve drum 13 passing over the suction slot 28 generate a suction air flow on the roving 17 which rests on the sieve drum 13 and thus condense it.
At an angular distance within the size of 45° follows, in conveying direction of the roving after the output pressure roller 14, a twist blocking roller 15 which likewise rests on the sieve drum 13. Between the output pressure roller 14 and the twist blocking roller 15 there is a condensing zone 12. From the twist blocking gap at the twist blocking roller 15 the twisted thread 17' then extends towards an actual ring spinning device 30.
According to figure 2 the twist blocking roller 15 is tilted in relation to the sieve drum 13 around a tilting axis 35 which coincides with the radius of the sieve drum 13 at the point of contact between sieve drum 13 and twist blocking roller 15. In this way an angle a develops between the axis of rotation 18 of the twist blocking roller 15 and the axis of rotation 19 of the sieve drum 13, due to which a contact between the sieve drum 13 and the twist blocking roller 15 results only in the area of the tilting axis 35. This contact area can be increased if the twist blocking roller 15 is made with a soft surface and if it is

being positioned somewhat more closely towards the sieve drum 13 than it would correspond with just a point contact.
Due to the angle a between the axes of rotation 18, 19, the not separately driven twist blocking roller 15 rotates with a somewhat lower circumferential speed than the sieve drum 13 being driven to generate the rotating motion of said twist blocking roller 15. The circumferential speed of the twist blocking roller 15 is reduced by a factor that corresponds with the cosine of the angle a.
In this way, during the operation of the spinning frame, the twist blocking roller 15 is driven with a lower circumferential speed than the sieve drum 13 which leads to a compression and/or relaxation of the roving within and in front of the area of the nip point between the sieve drum 13 and the twist blocking roller 15.
It is essential that the twist blocking roller 15 does not possess an own drive, but that it is driven through the contact with the surface of the driven sieve drum 13, that is, with reduced rotating motion due to the angle a.
For the realization of a circle-cylindrical twist blocking roller 15 according to figure 2, its generating line 36 is made straight-lined.
If, however, between the sieve drum 13 and the twist blocking roller 15, a longer nip line is to be obtained, then the generating line 36' is more or less concave curved according to figure 2. The radius of the generating line is to be selected in dependence of the diameter of the sieve drum 13 and the twist blocking roller 15 as well as the angle a between the axes of rotation 18, 19, in such a manner that the nip line is being extended in the desired way.
In the embodiment according to figure 3 there are two sieve drums 13 arranged next to each other on a common axis, each being furnished with a respective twist blocking roller 15'. Here a counter-type tilting of the twist blocking rollers 15' takes place around tilting axis 35' standina oeroendicular on the radii of the sieve ririima 13 within th^ =ar»a

of the points of contact of the sieve drums 13 and the twist blocking rollers 15\ which is obtained in that the twist blocking rollers 15', in the illustrated manner, are formed conical in opposite directions and which, with their outer surface along an axially extending nip line, rest on the outer surface of the sieve drums 13; thus opposite angles (3 result between the axes of rotation 18' and 19. The twist blocking rollers 15' are rotatably supported via drive shafts 37, being inclined according to the axes of rotation 18', at 38.
The conical twist blocking rollers 15' rotate with a number of revolutions which corresponds with the middle diameter of the twist blocking rollers 15'. Therefore the condition applies that the radius of the sieve drum 13 multiplied by its angular speed equals the middle radius of the twist blocking roller 15' multiplied by its number of revolutions. This means that only within the middle range of the twist blocking rollers 15' no slip prevails between the twist blocking roller 15' and the sieve drum, while in the end zones with a smaller diameter a slip takes place in the sense of a braking effect on a roving being supplied there.
On the other hand, within the zone of the largest diameter of the twist blocking rollers 15' a higher circumferential speed prevails than on the sieve drum which leads to an acceleration of a fibre web being supplied there between the sieve drum 13 and the twist blocking roller 35'.
While in case of the first exemplified embodiment according to the figures 1 and 2 the two axes of rotation 18, 19 being tilted toward each other do not intersect with one another, i.e. are not being arranged in a wind-inclined manner, in the case of the embodiment according to figure 3 a respective intersection 39 of the axes of rotation 18' and 19 results.
The substantial characteristic feature of the invention therefore is that the axes of rotation 19 of the rotating condensing element 13 and the twist blocking roller 15, 15' do not run parallel to each other.

Reference list of the numerals
11 drafting unit
12 condensing zone
13 sieve drum
14 output pressure roller
15 twist blocking roller
15' twist blocking roller
16 soft surface range
17 roving 17' thread
18 axis of rotation of the twist blocking roller 15 18' axis of rotation of the twist blocking roller 15'

19 axis of rotation of the sieve drum 13
20 motor-gear arrangement
21 axle center
22 pair of entrance rollers
23 pre-drawing area
24 pair of central rollers
25 apron
26 suction pipe
27 suction box
28 suction slot
29 hole
30 ring spinning device
31 axis of rotation
32 axis of rotation
33 path section
34 main drawing area
35 tilting axle
35' tilting axle
36 generating line

36' generating line
37 drive shaft
38 support
39 intersection





WE CLAIM :
1. Spinning frame, in particular a ring spinning frame, with a multiplicity of
spinning units each comprising a drafting unit (11) followed by a condensing zone
(12) which comprises a rotary movable condensing element, in particular a sieve drum
(13), with pneumatic suction means on which rests the output pressure roller (14) of
the drafting unit (11) and in an angular distance from it a twist blocking roller (15,
15'), characterized in that the axis of rotation (18, 18') of the twist blocking roller (15,
15') and the axis of rotation (19, 19') of the condensing element (13) run diagonally to
each other, i.e. comprises an angle (a, p) that deviates from 0.
2. Spinning frame as claimed in claim 1, wherein the tilting axis (35) of the twist
blocking roller (15, 15'), around which, for the formation of the angle (a) said twist
blocking roller is being tilted and coincides with the radius of the condensing element
(13) at the point of contact between the sieve drum (13) and the twist blocking roller
(15,15').
3. Spinning frame as claimed in claim 2, wherein the generating line (36) of the twist blocking roller (15) is straight-lined.
4. Spinning frame as claimed in claim 2, wherein the generating line (36') of the twist blocking roller (15') is concave curved and forms between the condensing element (13) and the twist blocking roller (15) a nip line which is, in relation to the tilting angle, longer than the axial length of the twist blocking roller (15).
5. Spinning frame as claimed in claim 1, wherein the tilting axis (35) of the twist blocking roller (15, 15'), around which, for the formation of the angle (P), said twist blocking roller is being tilted, runs perpendicular to the radius of the sieve drum (13) at the point of contact between the condensing element (13) and the twist blocking roller (15'), as well as to the plane formed by the axes of rotation (18', 19') of the twist blocking roller (15') and the sieve drum (13).

6. Spinning frame as claimed in claim 5, wherein the twist blocking roller (15') is
tapered in axial direction, formed conically in particular.
7. Spinning frame as claimed in claim 6, wherein the cone angle is twice as large
in comparison to the angle (P) between the axis of rotation (18') of the twist blocking
roller (15') and the axis of rotation (19) of the sieve drum.
8. Spinning frame as claimed in any one of the preceding claims, wherein the
angle (a, p) lies between 1° and 20°, preferably 5° and 10° and in particular between
7° and 8°.
9. Spinning frame as claimed in any one of the preceding claims, wherein the
twist blocking roller (15, 15') comprises a hard outer surface.
10. Spinning frame as claimed in any one of the claims 1 to 8, wherein the twist
blocking roller (15, 15') comprises a soft-elastic outer surface and the condensing
element (13) is positioned close toward the twist blocking roller (15, 15'), and the
outer surface of the condensing element (13) presses itself into the outer surface of the
twist blocking roller (15, 15').


Documents:

870-mas-2001-abstract.pdf

870-mas-2001-claims.pdf

870-mas-2001-correspondencne others.pdf

870-mas-2001-correspondencne po.pdf

870-mas-2001-description complete.pdf

870-mas-2001-drawings.pdf

870-mas-2001-form 1.pdf

870-mas-2001-form 26.pdf

870-mas-2001-form 3.pdf

870-mas-2001-form 5.pdf

870-mas-2001-other documents.pdf

abs-870-mas-2001.jpg


Patent Number 248280
Indian Patent Application Number 870/MAS/2001
PG Journal Number 27/2011
Publication Date 08-Jul-2011
Grant Date 01-Jul-2011
Date of Filing 24-Oct-2001
Name of Patentee MASCHINENFABRIK RIETER AG
Applicant Address KLOSTERSTRASSE 20, CH-8406 WINTERTHUR, SWITZERLAND
Inventors:
# Inventor's Name Inventor's Address
1 BLATTMANN, FELIX STATIONSTRASSE 74, CH-8542 WIESENDANGEN, SWITZERLAND
PCT International Classification Number D01H 1/02 ; D01H 5/72
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 100 53 442.2 2000-10-27 Germany