Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1991-05-22
1993-07-20
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
B65H 67048
Patent
active
052286304
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a turret type yarn winder, in which a pair of chucks for holding bobbins are arranged on a turret disc coaxial by and symmetrical to each other, and a full bobbin and an empty bobbin held on the respective chucks are alternately exchanged by the rotation of the disc so that the winding operation can be carried out without interruption. Particularly, it relates to a winder of the above type in which a yarn is taken up onto the bobbin while being traversed by a yarn traverse mechanism, during which the turret disc is rotated so that one chuck holding a working bobbin on which the yarn is being wound is gradually distanced from the traverse mechanism secured in a fixed position.
BACKGROUND ART
In general, in the turret type yarn winder, when an exchange of a full bobbin with a fresh empty bobbin is made, a yarn now being taken up is removed from a traverse guide to be transferred out of the normal traverse range of the yarn traverse mechanism with the aid of an exclusive guide means, is wound on an empty bobbin while the yarn is held by a yarn holding means secured, for example, on a base portion of a bobbin chuck, and then is severed from the full bobbin.
Due to the structure of a turret type winder, in which a pair of bobbin chucks are driven by a single motor, both chucks are driven at the same rotational speed, and the motor speed is controlled so that the chuck rotational speed becomes slower in accordance with an increase of a diameter of a bobbin held on the chuck now performing a winding operation and a yarn continuously delivered at a constant speed can be taken up without excessive tension or slack. During the above-described bobbin exchange operation, the yarn taken up on a full bobbin of a larger diameter is transferred to an empty bobbin of a smaller diameter driven at the same rotational speed as that of the former, which means that the yarn take-up speed is sharply lowered. Therefore, in a transition period until a desired rotational speed of a motor has been attained, which speed is controlled to correspond to a smaller diameter of a bobbin on which a yarn is freshly wound, the yarn is liable to be slackened due to the lower rotational speed of a bobbin chuck holding the empty bobbin, whereby a smooth yarn transfer and winding operation are hindered. To avoid this drawback, according to the conventional turret type winder, a plurality of dancer rolls are provided on a yarn feeding path to absorb yarn slack caused by the disparity between a yarn feeding speed and a yarn winding speed on a bobbin (see Japanese Examined Patent Publication No. 48-31178).
As stated above, a winder using an exclusive guide for a yarn transfer, provided other than a yarn traverse guide, has drawbacks in that it must have a complicated mechanism for driving the exclusive guide, the motion of which becomes inaccurate because of a repeated yarn transfer and often breaks down, which increases the man/hour required for the maintenance thereof.
On the other hand, the mechanism for absorbing a yarn slack by a series of dancer rolls at the beginning of a yarn transfer causes the total size thereof to be enlarged, and it is difficult to obtain the predetermined removal of yarn slack due to the rotational resistance of the dancer roll itself, as well as the yarn friction.
DISCLOSURE OF THE INVENTION
A primary object of the present invention is to eliminate the above-mentioned drawbacks of the prior arts, and to provide a mechanism capable of transferring a yarn without the provision of an exclusive yarn transferring guide, while utilizing the conventional yarn traversing device used for the normal yarn winding.
A second object of the present invention is to provide a clutch mechanism for rotating the respective bobbin chucks so that the yarn transfer from a full bobbin and an empty bobbin can be smoothly carried out by modifying a torque transmitted to the bobbin chuck, without using a complicated and expensive control means, by the utilization of an orbital motion of a b
REFERENCES:
patent: 3490707 (1970-01-01), Warshaw et al.
patent: 3856222 (1974-12-01), Wust
patent: 3921923 (1975-11-01), Kuno et al.
patent: 4216920 (1980-08-01), Tambara et al.
patent: 4431138 (1984-02-01), Schiminski et al.
patent: 4917319 (1990-04-01), Lenk
Imai Shuichiro
Nakai Shoji
Gilreath Stanley N.
Kamitsu Seisakusho Ltd.
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