Calculation of no of Coils per inch of the Roving Bobbin

Theory:

M/c specification:
1. Rpm of motor pulley = 960
2. Motor pulley diameter = 5″
3. Machine pulley diameter = 7″
4. Cradle wheel = 40T
5. Cradle carrier wheel = 55 T
6. No of teeth in TCP = 28T
7. No of teeth in TCCP = 30T
8. Diameter of top cone drum = 6.5″
9. Diameter of bottom cone drum = 3.87″
10. Bottom cone drum change wheel = 18T
11. No of teeth of fender wheel = 68T
12. No of teeth of fender shaft wheel = 30T
13. Fender swivel bracket carrier wheel = 36T
14. Top lifter change wheel = 18T
15. Wheel on stud bevel = 44T
16. Stud bevel wheel = 22T
17. Double upright bevel wheel = 22T
18. Double upright bevel wheel = 18T
19. Reversing bevel = 70T
20. Reversing bevel = 70T
21. Bobbin lifter change pinion = 16T
22. Socket swivel carrier wheel = 72T
23. Socket stud wheel = 13T
24. Differential motion carrier wheel = 57T

Fig: Gearing diagram of Roving Frame to calculate no of coils per inch of the roving bobbin

Calculation:
We know, Bobbin speed = 822
Spindle speed = 749
Therefore, Coils per minute = 822 – 749
                                          = 73
Result:
No. of coils per inch = 11.

Conclusion: