The Method of Accurately Positioning the Spindle in the Turret Type Automatic Winder

Abstract

The invention relates to automatic turret yarn winding equipment. The present invention provides an apparatus and method for precise positioning of a spindle in a turret winder during bobbin changeover. The method involves the step of rotating the turret during at least two discrete rotational movements performed at a controlled speed, whereby the empty bobbin assumes its exact winding position during the bobbin changing process. In an important inventive aspect of the present invention, the turret rotation is controlled by sensing the current in the motor used to control the spindles. The invention also discloses a system for controlling the movement of the turret and the spindle. It comprises a first control system (10) for controlling the rotational movement of the turret and a second control system (11) for controlling the rotational movement of the spindle. It also includes a master control system (12) controlling the two systems (10, 11) and receiving signals / information from and sending commands to the two systems (10, 11).

Description

technical field [0001] The invention relates to an automatic yarn winding turret capable of reliably positioning a spindle for winding after a bobbin changeover. Background technique [0002] Automatic turret winders are used to wind continuously arriving tape, thread or band onto bobbins. Typically, on a turret winder, a pair of bobbin holders (also called spindles) are mounted on opposite ends of a rotatable turret mounted on a suitable frame. Each spindle is alternately moved from the normal winding position to the doffing position with each half-turn of the turret. The turret keeps rotating in the same direction at desired time intervals or when the running spindle reaches its maximum length carrying the winding tape. Each spindle requires precisely controlled rotation about its own axis and so can be driven independently by an electric motor through a suitable mechanism such as a belt and pulley arrangement or with a separate direct drive motor system. Typically, an ...

AI Technical Summary

Problems solved by technology

[0007] Improper spindle positioning causes a gap between the spindle bobbin ready to be wound and the pressure roller, which in turn creates uneven winding tension and thus uneven package density

Second, some existing systems result in imprecise spindle positioning when the turret motion additionally pushes the cam roll in the reverse direction

This is due to the low sensitivity achieved in these spindle positioning methods (eg as mentioned in patent WO 2017 / 093950)

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