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US 3,986,330 AGranted
Method of and apparatus for twisting a yarn
AssigneeEvolution SA
InventorsRoland Kuttruff, Mauro Sbalzarini
Life of this patent
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AssigneeEvolution SA
InventorsRoland Kuttruff, Mauro Sbalzarini
Estimating the term…
A yarn package is frictionally engaged by a roller and driven at a peripheral speed so as to pay off a filament that is wound on a spindle positively connected to the output shaft of a fixed-speed motor. This output shaft is also connected through a steplessly variable transmission to a roller-drive shaft that rotates the payoff roller and therefore determines the linear velocity of the filament. A pair of detectors are provided for generating respective outputs corresponding to the rotation speeds of the motor output shaft and the roller drive shaft. These two outputs are fed to a divider where they are combined into an actual-value signal that is compared with a set point so as to form a difference signal. A regulator operated by this deviation signal acts on the adjustment element of the steplessly variable transmission to maintain a constant ratio between the angular velocity of the two shafts so that uniform twist is imparted to the filament. In addition an indicator is provided on which the amount of twist imparted to the filament can be read out so that a set point generator can be adjusted to allow this twist to be altered even during operation of the device.
An apparatus for paying a filament off a yarn package and twisting said filament and winding same up on a spindle, said apparatus comprising:
A method of operating an apparatus for twisting a filament and having a drive element for paying the filament off a yarn package at a pay-off speed and driven through a transmission by a drive motor rotating at an angular speed a spindle on which said filament is wound up, said method comprising the steps of:
Dependencies are inferred from the claim text.