Device for positioning and removing thread bobbins in a textile machine

Abstract

The bobbin placer and lifter consists of at least one yarn receiving cylinder (1) linked to a reciprocating mechanism (3) for winding the yarn bobbin (B) on a tubular support (4) retained by a holder and positioner (5), a dispenser (6) for the supports and a discharger (7) for the filled bobbins. The receiving cylinder and support tube are positioned for winding so they rotate with the yarn (2) passing under the receiving cylinder and over the support tube, and that the latter moves towards the discharger in a direction opposite to that in which the yarn arrives. The support dispenser is fixed, while the discharger is in the form of a ramp with the wound bobbin tending to roll down it when released. The holder is in the form of pivoted arms with forked ends (9, 10) that move as the size of the wound bobbin increases, releasing the bobbin on the discharger and picking up a new one as it travels in a circular trajectory.

Description

technical field [0001] The invention relates to the technical field of textile machinery, in particular doffing operations. [0002] In particular, the invention may be applied in the fields of textile machines, cabling, twisting and texturing machines and, more generally, in the texturing of threads. technical background [0003] The problem in textile machines of this type consists in particular of being able to remove and dismantle the tubular support on which the bobbin is formed, to replace it with an empty tubular support and to restart the production of a new bobbin . [0004] These operations are generally referred to as "doffing" by those skilled in the art. They include interrupting the process of winding on a bobbin that has reached the required weight or yardage, braking and then removing the full bobbin, replacing it with an empty tube and then restarting the winding process. This sequence is usually done manually, but is now done step by step automatically o...

AI Technical Summary

Problems solved by technology

[0015] A first disadvantage is that, especially if the removal means is a ramp along which the spool rolls down, at the time of removal, when the spool rolls down the ramp, the The direction of rotation of the spool described above will loosen the thread

[0016] A second disadvantage is that the tube dispensing hopper and the fork forming the clamping and positioning device are two moving parts, so that when transferring an empty tube, the two parts must be precisely aligned, and the The required adjustment is difficult to achieve

[0017] A third disadvantage is that, given the state of the art, as the diameter of the bobbin changes, the positioning of the forks causes a change in force that must be compensated for using a monitoring device that is difficult to adjust

[0018] Finally, a fourth disadvantage is that the spool tends to move sideways when placed on a ramp or other form of removal

In fact, the spool has a tendency to slide asymmetrically, given that it usually has a straight edge and a rounded edge, and this makes the spool more inclined to slide relative to the straight edge, resulting in an offset effect

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