DESC:TECHNICAL FIELD

Embodiments of the present disclosure relates to a web drafting assembly in a textile fibre processing machine. More particularly, embodiments of the disclosure relates to a web drafting assembly incorporated in the wider carding machine i.e. the carding machine of working width more than 1m, preferably 1.5m.
,CLAIMS:1. A web drafting assembly (11) of a carding machine, said assembly (11) comprises:
an upper and a lower apron assembly (A and B) arranged proximal to a doffer cylinder (1) for receiving fiber web from the doffer cylinder (1), wherein each of the upper and lower apron assembly (A and B) comprises;
at least one apron (2’ and 2’’);
one or more drive roller (3) for driving the aprons (2’ and 2’’);
at least one guide member (10) provided proximal to the doffer cylinder (1) for supporting the aprons (2’ and 2’’), wherein a portion (P) between ends of the guiding members (10) and the doffer cylinder (1) forms the fiber web pick off point; and
at least one support plate (9) provided inside each upper and lower apron assembly (A and B) to facilitate firm movement of the fiber web towards exit of the drafting assembly.

2. The web drafting assembly as claimed in claim 1, wherein the guide member (10) is selected from atleast one of a guide plate of predetermined cross section, a nose bar, and a combination of the guide plate and the nose bar.

3. The web drafting assembly as claimed in claim 2, wherein shape of the guide plate is selected from at least one of “T” shape, “V” shape, “Y” shape and any other shape which serve the purpose.

4. The web drafting assembly as claimed in claim 1, wherein the drive rollers (3) are oriented at predetermined angles inside respective loop of each upper and lower apron assembly (A and B).

5. The web drafting assembly as claimed in claim 1 further comprises nip roller assembly (3a’ and 3a”) in between doffer cylinder (1) and said upper and lower apron assembly (A and B).

6. The web drafting assembly as claimed in claims 1 and 5 wherein each of the nip roller assembly (3a’ and 3a’’) comprises at least one apron (2a), and one or more drive rollers (2a’ and 2a’’) for driving the aprons (2a).

7. The web drafting assembly as claimed in claim 1, wherein the guide member (10) is provided distal to the doffer cylinder (1) inside the apron upper and lower assembly (A and B).

8. The web drafting assembly as claimed in claim 1, wherein at least one nip roller assembly (3a’ and 3a’’) is provided at downstream to the upper and lower apron assembly (A and B).

9. The web drafting assembly as claimed in claim 8 wherein each of the nip roller assembly (3a’ and 3a’’) comprises at least one apron (2a), and one or more drive rollers (2a’ and 2a’’) for driving the aprons (2b).

10. A carding assembly comprises:
at least one carding roller;
a doffer cylinder (1) arranged proximal to the carding roller for forming a fiber web; and
a drafting assembly (11) for drafting the fiber web, said assembly (11) comprises:
an upper and a lower apron assembly (A and B) arranged proximal to a doffer cylinder (1) for receiving fiber web from the doffer cylinder (1), wherein each of the upper and lower apron assembly (A and B) comprises;
at least one apron (2’ and 2’’);
one or more drive roller (3) for driving the aprons (2’ and 2’’);
at least one guide member (10) provided proximal to the doffer cylinder (1) for supporting the aprons (2’ and 2’’), wherein a portion (P) between ends of the guiding members (10) and the doffer cylinder (1) forms the fiber web pick off point; and
at least one support plate (9) provided inside each upper and lower apron assembly (A and B) to facilitate firm movement of the fiber web towards exit of the drafting assembly.