US 4,261,164 AGranted

Double twist spindles

AssigneeVerdol S.A.

InventorJean-Jacques Tardy

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Abstract

In a double twist spindle device wherein the support of the supply bobbin is retained against rotation on the spindle proper by two rows of permanent magnets disposed opposite each other each side of the radial passage of the yarn issuing from the axial bore of the spindle, one of the said rows is mounted in such manner as to be displaceable through a limited extent with respect to its supporting member. If the frictional torque between the spindle and the bobbin support temporarily reaches such an excessive value that the relative angular displacement of the rows becomes equal to the pitch of the successive magnets in both rows, the repulsive magnetic forces displace the said displaceable row in such manner that the undesirable accelerating effect of the magnetic forces on the bobbin support is eliminated or at least strongly decreased and that the rows may again find a new state of equilibrium when the excessive frictional torque disappears. In an embodiment the row corresponding to the bobbin support is angularly displaceable through an angle greater than the pitch of the magnets in the rows. In another embodiment it is displaceable axially so as to momentarily increase the distance apart of both rows.

Claims7

Dependent claims

In a double twist spindle device having a base member supporting a hollow spindle for rotation with respect to the base member, the spindle having a radially disposed disc adjacent to the base member and the disc having a radial yarn opening communicating into the spindle, and the device having a bobbin support member journaled to and surrounding the spindle on the other side of the disc from the base member, the spindle being rotatable about its axis within the bobbin support member, improved means for opposing rotation of the bobbin support member with respect to the base member comprising:

(a) a first plate and a second plate, the plates being radially disposed with respect to the spindle and being respectively located on opposite sides of said disc and spaced from the disc and the spindle;
(b) an annular series of magnets mounted on each plate concentric with the spindle, the magnets in each series having poles facing the magnets in the opposite series across the disc, and the poles of the magnets alternating in polarity circumferentially about the series;
(c) means for fixing one of said plates to one of said members;
and
(d) means for supporting the other of said plates on the other of said members, including means operative when the magnetic forces between the opposite series of magnets are attractive to transmit from said other plate to said other member torque directed to oppose rotation of said bobbin support member about said base member, and including means operative when the forces between the opposite series of magnets are repulsive to displace said other plate relative to said other member in a direction to decrease the repulsion forces between the magnets of the two series.

2 more elements

Dependencies are inferred from the claim text.