Threading apparatus and threading method in a textile machine

Textiles: spinning – twisting – and twining – Apparatus and processes – Threading up

Reexamination Certificate

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Details

C057S284000

Reexamination Certificate

active

06438933

ABSTRACT:

TECHNICAL FIELD TO WHICH THE INVENTION RELATES
The present invention relates to a threading apparatus and a threading method in a textile machine. More specifically, the present invention relates to a threading apparatus and a threading method by which threading operation from a twisting device to a winding device can be done easily in a textile machine, such as a draw false-twist texturing machine.
BACKGROUND ART
In a false-twist texturing machine or a draw false-twist texturing machine, a yarn supplied from a supply package on a creel is fed by means of a first feed roller, while twists imparted by a twisting device disposed downstream and run back along the yarn are heat set by means of a first heater disposed between the first feed roller and the twisting device, and the yarn is cooled at a stabilizing zone locating downstream of the first heater and is detwisted at the twisting device, and then the yarn is fed by means of a second feed roller and is wounded. In many cases, leaving the second roller, the yarn passes through a second heater and, if desired, through a third feed roller, and it is fed to the winding device.
In such a false-twist texturing machine or a draw false-twist texturing machine, known is a textile machine comprising: a main frame provided with twisting devices and second heaters; a winding frame provided with winding devices facing and spacing from the main frame; and an operator's aisle disposed between the main frame and the winding frame. The yarn leaving the second heater passes beneath the operator's aisle and is fed to the winding device.
When such a construction as described above wherein an operator's aisle is disposed between the main frame and the winding frame is used, a so called individual doffing mechanism by which doffing operation from the winding parts of the winding frame is done for individual spindles can be readily disposed, and thus, while the threading operation can be done at the side facing the operator's aisle, the fully wound packages can be doffed from the side opposite to the operator's aisle.
Further, when the first heater is a heater which can be heated to a high temperature higher than 400° C., since the heater length of the first heater can be relatively shortened, the yarn passage in the heating zone can be brought into a condition like a straight line by the application of such a separate construction of the main frame and the winding frame, and run back of twists imparted by the twisting device can be done effectively, and thus, quality of the false-twist textured yarn which will be obtained can be good.
In addition, when the second heater is a heater which can be heated to a high temperature between 250 and 600° C., all of the twisting device, the feed rollers, and the second heater can be disposed in such a region that they can be serviced by an operator standing at the operator's aisle, and the winding devices on the winding frame can also be located in such a region that they can be serviced by an operator standing at the operator's aisle, and thus, the operator can readily perform operations, such as a threading operation without using a step.
As described above, many advantages can be achieved by the arrangement wherein the main frame is provided with the twisting devices and second heaters, the winding frame is provided with the winding devices, and the operator's aisle is disposed between the frames. However, the most serious problem inherent to this arrangement is that the operator has to bend for threading operation since the yarn from the main frame to the winding frame passes beneath the floor disposed at the operator's aisle.
Taking the problem inherent to such a conventional apparatus into consideration, it is an object of the present invention to provide an apparatus and method for threading a yarn onto a textile machine, especially false-twist texturing machine or draw false-twist texturing machine, by which an operator can perform threading operation around the operator's aisle without bending.
It is another object of the present invention to provide a threading apparatus by which threading operation onto a second heater heated at a temperature of between
250
and 600° C. without encountering any substantial problems.
Further, it is a still other object of the present invention to provide a threading apparatus by which threading operation onto a winding device can be done very easily.
DISCLOSURE OF THE INVENTION
According to the present invention, the above-described objects are achieved by a yarn threading apparatus in a textile machine comprising:
a main frame provided with twisting devices and heaters disposed downstream of the twisting devices; and
a winding frame facing the main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on the main frame is guided along the operator's aisle to the winding device disposed on the winding frame, characterized in that
a yarn guide pipe is disposed extendably and retractably along the operator's aisle,
a yarn feed roller device is so disposed that it locates at the yarn feeding position when the yarn guide is retracted and that it moves to a stand-by position when the guide pipe is extended, and
a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of the yarn guide pipe and the winding device.
Further, the present invention achieves the objects by a yarn threading apparatus in a textile machine comprising:
a main frame provided with twisting devices and heaters disposed downstream of the twisting devices; and
a winding frame facing the main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on the main frame is guided beneath the operator's aisle to the winding device disposed on the winding frame, characterized in that
the heater is provided with a yarn threading slit extending along a yarn passage, and
a guide member which is engageable with and disengageable from the yarn prior to being threaded into the heater is disposed adjacent to the yarn threading slit, whereby while the yarn is guided from the guide member to the winding device passing beneath the operator's aisle, the yarn is disengaged from the guide member and is threaded into the heater through the yarn threading slit.
In this occasion, it is preferred that the guide member is a pipe with a spiral cross section which is disposed adjacent to the heater and which is provided with a yarn removing slit extending along the yarn passage.
Further, the present invention achieves the above-described objects by a yarn threading apparatus in a textile machine comprising:
a main frame provided with twisting devices and heaters disposed downstream of the twisting devices; and
a winding frame facing the main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on the main frame is guided along the operator's aisle to the winding device disposed on the winding frame,
characterized in that
the heater is provided with a yarn threading slit extending along a yarn passage,
a guide pipe member with a spiral cross section and provided with a yarn removing slit extending along the yarn passage is disposed adjacent to the yarn threading slit, and the member is engageable with and disengageable from the yarn prior to being threaded into the heater,
a yarn guide pipe is disposed extendably and retractably along the operator's aisle,
a yarn feed roller device is so disposed that it locates at the yarn feeding position when the yarn guide is retracted and that it moves to a stand-by position when the guide pipe is extended, and
a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of the yarn guide pipe and the winding device.
In this occasion, it is preferred that the heater is a non-contact type high temperature heater which is c

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