(57) The invention relates to a yarn unwinding assisting device provided in a winder unit,
comprising a fixed cylinder (15) held in a fixed condition to assist unwinding of
a yarn from a bobbin, and a movable cylinder (16) moving in conjunction with the unwinding
of the yarn from the bobbin, while assisting the unwinding of the yarn from the bobbin.
The fixed cylinder (15) is elevated and lowered hy a first elevating and lowering
mechanism (18) having a driving source, so as to change an initial position of the
fixed cylinder (15), and the movable cylinder (16) is elevated and lowered by a second
elevating and lowering mechanism (19) having a driving source. The driving source
of the first elevating and lowering mechanism (18) and the driving source of the second
elevating and lowering mechanism (19) each comprise a stepping motor (35, 45). Based
on bobbin data pre-input to a control circuit (50) and position signals resulting
from detection by position detectors on the stepping motors (35, 45), the control
circuit (50) controls operating states of the stepping motors (35, 45). Thus, the
initial positions and operating positions of the fixed cylinder (15) and the movable
cylinder (16) can be automatically set depending on a change the vertical size of
a bobbin. (Fig. 1)
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