| 摘要 |
A spinning frame or a ring twister frame with semi-automatic doffing and donning is provided with a doffing bar on the usual ring rail with projections which in one position of the doffing bar are opposite each wound bobbin. The ring rail is pneumatically lowered when the bobbins are fully wound to a position just below the normal starting position and the doffing bar moved so that the projections are underneath the bottom ends of the bobbins. The pneumatic cylinder used to bear down the rail is double acting, and when the doffing cycle is manually started raises the ring rail to a position high enough to lift the wound bobbins off their spindles. At the same time, a wall is tilted, forming a chute into which the bobbins fall, and a conveyor in the bottom of the chute carried them to a full bobbin container. In the case of spinning frames, there is carried on the ring rail a donning tube with holes opposite each spindle, and before initiating the doffing cycle the operator fills these holes with empty cores or bobbins upside down. The next actuation pneumatically brings the donning tube over the rings in the ring rail and causes the tube to rotate 180 DEG . The empty bobbins fall down onto the spindles and then the ring rail is borne down again to normal position for starting winding. This produces a slack on the traversing chain and a pneumatic cylinder rewinds this to starting position. When the starting button is pushed, winding starts as usual.
|
