JPH01275375A - Doffing method - Google Patents

Abstract

PURPOSE:To completely get rid of the false action of an automatic doffing device due to the absence of bobbin thread on the side of a thread feed bobbin, by winding the thread end of a wound up package around an empty paper tube, and conducting the joining of the threads of this paper tube and the thread of the paper feed bobbin, and conducting. CONSTITUTION:A thread end is sought out of a wound up package 7 which has emitted a fully wound up signal, and after conducting a punch winding 17 or the needed winding around 18 of a thread against an empty paper tube 15, cutting is done again. Next, the thread joining of the threads of this empty paper tube 15 and a thread feed bobbin 7 conducting a winding back, is done. As a result, regardless of the remaining quantity of the thread of the thread feed bobbin 7, the doffing action of an automatic doffing device can be conducted smoothly without a false action due to.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a doffing method in an automatic winder.

[Prior art] The yarn feeding bobbin after leaving the spinning machine is generally rewound in an automatic winder to cut and remove yarn defects such as threads and slabs contained in the bobbin, and to package the yarn with the amount and shape suitable for subsequent processes. will be rewound.

That is, the yarn pulled out from the yarn feeding hobbin is pulled out by a tension device,
After passing through a slab catcher, etc., it is traversed and wound by a package that rotates in surface contact with a traverse drum, and when the yarn length or package reaches a set amount, the winding operation is stopped and a full package is doffed. . This doffing operation is performed by an automatic doffing machine, which cuts the thread when the package is wound up, supplies thread from the yarn feeding bobbin to the empty paper tube, performs yarn splicing, and then issues a doffing signal. It's fried.

[Problems to be Solved by the Invention] By the way, the above-mentioned doffing operation has the following problems.

When splicing yarn, if there is not enough yarn on the yarn feeding bobbin, the inertial rotation after the traverse drum stops will cause it to be wound into a package for about 200 to 300 m, resulting in the yarn running out on the yarn feeding bobbin, or the thread being lost immediately after winding is restarted. If the bobbin runs out of thread, a new bobbin must be supplied and the thread splicing operation must be performed again.

As a result, since the yarn on the package side is also extremely short, the yarn necessary for yarn splicing is sucked into the suction arm and used up, causing the problem that yarn splicing becomes impossible and the automatic doffing device stops.

Further, the slab catcher may detect a slab immediately after the drum starts and the yarn may be cut, and in this case as well, thread splicing may become impossible as there is less yarn on the package side.

Furthermore, while the automatic doffing device is operating, the clearer stops detecting yarn defects to avoid yarn breakage, and during this operation, the yarn wound onto the empty paper tube is defective yarn that has not been detected by the clearer. The problem was that the possibility of

In view of the above-mentioned problems, the present invention eliminates operational errors in automatic doffing equipment due to no bobbin thread, eliminates winding of defective yarn during doffing operation, and prevents clearer breakage after the traverse drum starts. The purpose of this invention is to provide a doffing method that is possible.

[Means for Solving the Problems] In order to achieve the above object, the present invention cuts the yarn in response to a full winding signal, and bundles the yarn end of the wound package onto an empty paper tube or uses the yarn necessary for yarn splicing. After winding, the yarn on the paper tube and the yarn on the yarn supply bobbin are spliced and doffed.

[Function] Since the structure is as described above and the thread for splicing is supplied from the package wound up on the empty paper tube, the doffing operation of the automatic doffing device eliminates the remaining thread on the yarn feeding bobbin. This is done smoothly without being affected by the amount of yarn, and since the splicing is performed with the yarn that has passed through the clearer, no defective yarn is wound into the package during the doffing operation.

[Example] An example of the doffing method of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 3 shows an example of the automatic winder 1. As shown in the figure, the yarn Y pulled out from the yarn supply bobbin 2 passes through a balloon breaker 3, a tension device 4, a slab catcher 5, and is wound onto a package 7 rotated by a traverse drum 6. A splicing device 8 and a first suction arm 9 and a second suction arm 10 for guiding the yarn end to the splicing device 8 are provided, and the first suction arm 9 pivots about a shaft 11; The yarn end on the package 7 side is suctioned and gripped, and the yarn splicing device 8
The second suction arm 10 pivots around the shaft 12, suction-holds the yarn end on the yarn supplying bobbin 2 side, and guides it to the yarn splicing device 8. In the figure, 13 is a brain lamp for doffing signal after full winding.

Further, when the clearer (not shown) of the slab catcher 5 detects a thread defective part of the slab or the like contained in the system,
A slab signal is generated, the yarn is cut by a cutter (not shown) provided in the slab catcher 5, and the presence or absence of yarn travel is detected.

In order to carry out the method of the present invention on the automatic winder 1 configured as described above, the third suction arm 14 is rotated from above facing the package 7 as shown in FIG.
It is equipped with the following.

The doffing method of the present invention, which is implemented using such an automatic winder 1, will be explained.

The spun yarn feeding bobbin 2 is attached to the automatic winder 1, and the yarn pulled out from the yarn feeding bobbin 2 is passed through a tension device 4,
The package is traversed and rewound through a slab catcher 5 and the like onto a rotating package 7 in surface contact with a traverse drum 6. When the package diameter reaches the set value, the doffing operation is initiated by this full winding signal. During this operation, the clearer of the slab catcher 5 cuts the yarn Y in response to the top winding signal 9 that stops detection, searches for the yarn end of the wound package 7, and suctions it with the third suction arm 14. grasp. Then, the third suction arm 14 is rotated, and as shown in FIG.
7, or as shown in FIG. 3, the yarn is wound 18 to a length necessary for splicing, and then the yarn is cut again. Next, this cut empty paper tube 15ffl! The yarn end of I and the yarn end of the yarn feeding bobbin 7 that is to be wound back are spliced by the first and second suction arms 9 and 10 and the splicing device 8. After that, the doffing signal is sent by the brain lamp 13. The empty paper tube 1 is taken out and doffed using a cradle (not shown).
5 is brought into surface contact with the traverse drum 6.

In this embodiment, the yarn end is searched for from the wound package 7 for which the full winding signal has been output, and the yarn end is found on the empty paper tube 15 as shown in FIG. 2 or the bunch winding 17 as shown in FIG. After winding the yarn 18 as described above, the yarn is cut again, prepared in this manner, and the yarn of the empty paper tube 15 is spliced with the yarn of the yarn feeder bob 1 bin 7 to be rewound. So, the yarn feeding bobbin 7
Since it is not affected by the amount of thread row, the automatic doffing device does not make any operational errors due to no bobbin thread, and the doffing operation is performed smoothly.

In addition, since the yarn Y is not pulled out from the yarn supply bobbin 7@, slack in the yarn Y does not occur between the yarn supply bobbin 7 and the empty paper tube 15. Therefore, no cracking occurs during the doffing operation, and no clearer breakage occurs after the traverse drum 6 is started after doffing.

Furthermore, yarn Y for splicing is drawn out from the wound package 7 and supplied to the empty paper tube 15, and since this yarn Y is the yarn Y after passing through the clearer, the doffing operation is in progress as in the conventional case. This prevents defective yarn that has not passed through the clearer on the yarn supply bobbin 7 side from being wound up.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since yarn splicing is performed using the yarn of the wound package, it is possible to completely eliminate operational errors of the automatic doffing device due to no bobbin thread on the yarn feeding bobbin side.

(2) Since yarn splicing is performed using yarn that has already passed through the clearer, winding of defective yarn during doffing can be completely eliminated.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram for explaining the doffing method of the present invention, Fig. 2 is a schematic diagram showing bunch winding on an empty paper tube, and Fig. 3 is a schematic diagram illustrating bunch winding on an empty paper tube. A schematic diagram showing winding, and FIG. 4 is a schematic side view showing an example of an automatic winder. In the figure, 7 is a package and 15 is an empty paper tube. Patent Applicant Murata Machinery Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Cut the yarn in response to the full winding signal, wrap the yarn end of the wound package on an empty paper tube in bunches or wrap the yarn necessary for yarn splicing, and then connect the yarn on the paper tube with the yarn supply bobbin. A doffing method characterized by splicing with threads and doffing.