| 摘要 |
The device provides for winding much larger yarn packages on each of a pair of vertically spaced yarn winder chucks on one side of a common drive roll and displaceable alternately in respective slots of a front wall of the yarn winder into engagement with the drive roll for winding of yarn packages and bobbins on the chucks. An adjustable length arm is swingably mounted, through an anti-friction bearing, on a motor drive shaft extending through the front wall midway between the chuck slots and outwardly of the retracted positions of the chucks, and a small diameter pulley is rotatably mounted on the free end of the arm. A larger diameter pulley is fixed to the drive shaft, and a belt is trained around both pulleys. A pair of solenoids, having armatures spring biased outwardly, are aligned in opposition and their armatures engage a fin projecting from the pivot end of the arm to bias the arm to a neutral position in which the belt is out of the paths of movement of the chucks. While yarn packages are being wound on bobbins on one chuck, the idle chuck is moved past the incompletely wound packages to a standby position adjacent to, but out of contact with, the drive roll. Upon signal, one solenoid is energized to retract its armature and the other armature swings the arm to engage the belt portion trained around the small diameter pulley with the idle chuck. The drive motor is then energized to gradually accelerate the idle chuck to a peripheral speed substantially synchronized with that of the drive roll, after which the thus accelerated chuck is moved to engage its bobbins with the drive roll. Thereafter, the one solenoid and the motor are de-energized, and the device is biased to its neutral position.
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