Method for automatic doffing operation and doffing apparatus

Abstract

The present invention relates to an automatic doffing operation. Conventionally if in spite of a failure in a yarn drawing-out operation, a yarn hooking operation is performed and an empty bobbin is uselessly supplied, an operator is thus forced to remove the bobbin. The present invention includes a full-package taking-out operation step of taking a bobbin with a package out of a cradle, a yarn drawing-out operation step of using a yarn drawing-out device to start drawing out a spun yarn and then catching the spun yarn, and a yarn hooking operation step of supplying an empty bobbin to the cradle and hooking the spun yarn on the bobbin to return a doffing operation to an initial state. If the yarn fails to be caught during the yarn drawing-out operation step, a reverse returning step is executed instead of the yarn hooking operation step to reversely rotate a motor to return the doffing operation to its initial state without executing the yarn hooking operation step.

Description

technical field [0001] The present invention relates to an automatic doffing operation method and its device. It is a pairing device with a yarn take-out device and a take-up device with a cradle, using a bobbin transfer device that is driven by a single motor in linkage. A method and device for automatic doffing operation performed by an air suction type yarn catching device and a doffing device of a cradle operating device. Background technique [0002] It is known in the past that such a device (automatic doffing device) is provided in a fiber machine provided with a yarn take-out device and a take-up device, which automatically takes out a full-volume winding package and supplies it for replacement. A device for working on an empty bobbin or threading the empty bobbin (系挂け). For example, the technology disclosed in Patent Document 1. [0003] The fiber machine disclosed in Patent Document 1 is a spinning machine, and is provided with a yarn take-up device including a d...

AI Technical Summary

Problems solved by technology

[0006] Moreover, the head-spinning action takes a corresponding amount of time

When spinning-in is performed regardless of the failure of the yarn take-out action, that part of the spinning-up time is completely wasted

Especially in the case of fiber machines where one doffing device serves multiple counterparts (e.g., a spinning device for a single spindle), the The increase will completely implicate the reduction of the production efficiency of the entire fiber machinery

[0007] That is to say, the existing technology needs to solve the problem that, during the execution of the automatic doffing action, when the threading action (系挂け action) is continued regardless of whether the yarn take-out action fails or not, the removal will be in vain. The task of feeding empty bobbins is imposed on the operator

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