Spinning or twisting machine, especially for glass-fiber threads

In textile machines comprising first drive means for rotating a supply bobbin from which a thread is being drawn through a traveler onto a cop on a spindle rotated by second drive means,

• the combination therewith of:
• monitoring means disposed between said supply bobbin and said traveler for generating a velocity-measuring signal indicative of the rate of advance of a thread being payed out by the bobbin;
• speed-regulating means coupled with said first drive means and responsive to said velocity-measuring signal for controlling the rotation of said supply bobbin to maintain said rate of advance at a prescribed value, said monitoring means comprising a rotary member mechanically entrainable by said thread and a tachometric device coupled with said rotary member, being a generator of metering pulses of a recurrence frequency proportional to said rate of advance;
• and
• alarm means coupled to said generator for arresting said first and second drive means in response to a significant decrease in the recurrence frequency of said metering pulses.

In textile machines comprising first drive means for rotating a supply bobbin from which a thread is being drawn through a traveler onto a cop on a spindle rotated by second drive means,

• the combination therewith of:
• monitoring means disposed between said supply bobbin and said traveler for generating a velocity-measuring signal indicative of the rate of advance of a thread being payed out by the bobbin;
• speed-regulating means coupled with said first drive means and responsive to said velocity-measuring signal for controlling the rotation of said supply bobbin to maintain said rate of advance at a prescribed value;
• and
• sensing means coupled to said monitoring means for emitting an alarm signal in response to a significant slowdown in said rate of advance.