Method and apparatus for automatically controlling winding tension of a roving in a roving machine

DETAILED DESCRIPTION With the above object in view, this invention resides in the method for automatically controlling the winding tension of the roving in the bobbin lead roving machine comprising automatically measuring the mean bobbin winding diameter D.
sub.
B, bobbin r.
p.
m.
N.
sub.
B and the flyer N.
sub.
F for one or more of the operating spindles, automatically calculating the equation representing the winding condition for the roving (n.
sub.
B /N.
sub.
F -1).
times.
D.
sub.
B =K, and automatically increasing or decreasing the bobbin r.
p.
m.
when the value K has exceeded a preset control limit for correcting the value K towards its central setting for automatically correcting the winding tension of the roving.
Furthermore, the invention resides in a device for automatically controlling the winding tension of a roving in a bobbin lead roving machine, said device comprising a non-contact distance measurement device adapted for measuring the bobbin diameter D.
sub.
B for one or more operating spindles, sensors for measuring the bobbin r.
p.
m.
and flyer r.
p.
m.
, a micro-computer operative to calculate the equation representing the winding condition for the roving (N.
sub.
B /N.
sub.
f -1).
times.
D.
sub.
B =K, to compare the resulting value K with a preset control limit therefor and to issue a corresponding correction signal when the value K has exceeded said control means, relay means operable by said correction signal, and means responsive to the operation of said relay means for changing the bobbin r.
p.
m.