DESC:As enclosed ,CLAIMS:We Claim:
1. A drive arrangement for drafting rollers in long ring spinning machine, comprising:
a first set of drafting modules (A, C) and a second set of drafting modules (B, D) disposed between a headstock side and an endstock side of a machine frame 5 of the ring spinning machine, each of the first set of drafting modules (A, C) and the second set of drafting modules (B, D) has a front roller (1a, 1b, 1c, 1d), a split two-part middle roller (2a, 2b, 2c, 2d), and a split two-part rear roller (3a, 3b, 3c, 3d) arranged in at least two rows (LH, RH),
characterized in that the middle drafting rollers (2a, 2c) and the rear drafting 10 rollers (3a, 3c) of the first set of drafting modules (A, C) and the middle drafting rollers (2b, 2d) and the rear drafting rollers (3b, 3d) of the second set of drafting modules (B, D) are driven by an electric motor (SM1) at the headstock side, driven by an electric motor (SM2) at an intermediate position of the machine frame, and driven by an electric motor (SM3) at the endstock side; 15
the front drafting roller (1a) of the drafting module (A) is driven by an electric motor (SM4) and the front drafting roller (1c) of the drafting module (C) is driven by an electric motor (SM5) at the headstock side; and
the front drafting rollers (1b, 1d) of the second set of drafting modules (B, D) are driven by an electric motor (SM6) at the endstock side. 20
2. The drive arrangement as claimed in claim 1, wherein the first set of drafting modules (A, C) and the second set of drafting modules (B, D) are separated from each other between the machine frame to distribute torsional force over entire length of the plurality of drafting rollers (1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d, 3a, 3b, 3c, 3d) in 25 the ring spinning machine.
3. The drive arrangement as claimed in claim 1, wherein the middle drafting rollers (2a, 2c) and the rear drafting rollers (3a, 3c) of the first set of drafting modules (A,
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C) are split into two shafts of equal lengths or different lengths anywhere across the length.
4. The drive arrangement as claimed in claim 1, wherein the middle drafting rollers (2b, 2d) and the rear drafting rollers (3b, 3d) of the second set of drafting modules (B, D) are split into two shafts of equal lengths or different lengths anywhere across 5 the length.
5. The drive arrangement as claimed in claim 1, wherein each of the at least one front drafting rollers (1a, 1b, 1c, 1d) drive at least one delivery drafting roller (fourth roller) through a gear train for compact spinning.
6. The drive arrangement as claimed in claim 1, wherein the first set of drafting 10 modules (A, C) comprises a plurality of delivery drafting rollers (fourth roller) driven by a common electric motor or separate electric motors at the headstock side for compact spinning.
7. The drive arrangement as claimed in claim 1, wherein the second set of drafting modules (B, D) comprises a plurality of delivery drafting rollers (fourth roller) 15 driven by a common electric motor or separate electric motors at the endstock side for compact spinning.
8. The drive arrangement as claimed in claim 1, wherein the electric motors (SM1, SM2, SM3, SM4, SM5, SM6) are selected from the group consisting of servo motor, induction motor, synchronous motor, and asynchronous motor. 20
9. The drive arrangement as claimed in claim 8, wherein the electric motors (SM1, SM2, SM3, SM4, SM5, SM6) are connected to one or more servo drives or frequency converters.
10. The drive arrangement as claimed in claim 1, wherein the long ring spinning machine comprises preferably 2400 spindles.