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AssigneeTeijin Limited
InventorsMasahiro Muramatsu, Katsutoshi Taniguchi, Katsuhiko Murase
Estimating the term…
After doffing a full size yarn package from a bobbin holder of a takeup apparatus, a fresh bobbin is mounted thereon. A supplying thread via a thread guide is then sucked into an aspirator disposed adjacent to the takeup unit. Next, a portion of the thread upstream from the aspirator is caught by a cut-out groove at a free end of the bobbin holder and a helical winding is formed from the groove to a position on the fresh bobbin where the distance from the thread guide is minimum, and an initial bunch winding is formed at this position. Thereafter, the helical winding is eliminated by forming an additional bunch winding from a part thereof while the remaining part is sucked into the aspirator. The above method is applied to a takeup unit with a bobbin holder capable of mounting a plurality of bobbins so as to simultaneously form yarn packages from continuously supplied supplying threads. The bunch winding forming operation is carried out separately and sequentially from a bobbin furthest from the free end of the bobbin holder and, after a bunch winding is formed on each of the fresh bobbins all supplying threads are simultaneously introduced into respective traverse guides and normal takeup operation of the takeup unit is commenced.
In a method of forming a bunch winding on each fresh bobbin mounted on a bobbin holder rotatably mounted on a takeup unit provided with a traverse guide disposed at a position corresponding to each fresh bobbin at the time of carrying out a doffing and donning operation, wherein a supplying thread via a thread guide disposed above said corresponding thread guide is firstly introduced into an aspirator disposed at an outside position of said bobbin holder, when a yarn package formed on said bobbin mounted on said bobbin holder becomes a predetermined full size, next a thread portion between said full size yarn package and said aspirator is cut, and thereafter said full size yarn package is doffed from said bobbin holder and a fresh bobbin is mounted on said bobbin holder at the position where said full yarn package was doffed said bunch winding forming method comprising:
A device for forming a bunch winding, at a time of carrying out a doffing and donning operation, on each fresh bobbin mounted on a bobbin holder rotatably mounted on a takeup unit provided with a traverse guide disposed at a position corresponding to each fresh bobbin and a thread guide disposed above said traverse guide, comprising incorporated with a doffing and donning apparatus, an aspirator disposed at a position outside and above said bobbin holder for sucking a supplying thread coming from said thread guide, a displaceable thread guide for introducing said supplying thread into said aspirator before carrying out said doffing operation, said bobbin holder being provided with a cut-out groove formed at a free end thereof, means for introducing a portion of said supplying thread between said thread guide and said aspirator to a position adjacent to said cut-out groove where said thread portion is capable of being caught by said cut-out groove, a first actuating means for displacing said aspirator between a first position adjacent said displaceable thread guide and a second position adjacent said cut-out groove, a second actuating means for actuating said displaceable thread guide, a third actuating means for actuating said introducing means, a programing control mechanism for sequentially actuating said first, second and third means in combination for actuating said doffing and donning apparatus.
Dependencies are inferred from the claim text.