An inverter of a winding unit is controlled by preparing a plurality of kinds of acceleration instructions having different speed characteristics in the central control apparatus, selecting the sharpest acceleration instruction within the limit determined by generation of slip between drum and package, type of yarn and tension of yarn, etc. for each winding unit and transmitting the digital information thereof to the sequencer of the winding unit.
On an automatic winder, at the time of doffing, a signal is sent from a doffing device to a winding unit, a drum motor of the winding unit is driven at a low speed in response to said signal to rotate a package on a traverse drum, and a bobbin yarn is picked up. The automatic winder has a number of winding units juxtaposed, the doffing device is provided to freely travel along the winding units a paper tube supply system for delivering one or more kinds of paper tubes is installed at one end of the automatic winder, a conveyor for carrying paper tubes from the paper tube supply system is provided parallel with a travel path of the doffing device, and a paper tube holding device for receiving paper tubes carried by the conveyor is provided on the doffing device.
On an automatic winder, at the time of doffing, a signal is sent from a doffing device to a winding unit, a drum motor of the winding unit is driven at a low speed in response to said signal to rotate a package on a traverse drum, and a bobbin yarn is picked up. The automatic winder has a number of winding units juxtaposed, the doffing device is provided to freely travel along the winding units a paper tube supply system for delivering one or more kinds of paper tubes is installed at one end of the automatic winder, a conveyor for carrying paper tubes from the paper tube supply system is provided parallel with a travel path of the doffing device, and a paper tube holding device for receiving paper tubes carried by the conveyor is provided on the doffing device.