JPS641319Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to a device for preventing tail thread entanglement in an automatic tube changer, and more specifically, it prevents malformation of the tail thread when restarting operation of the spinning machine after doffing is completed. This invention relates to a tail thread entanglement prevention device installed in a single-spindle continuous lifting type automatic pipe changer to prevent thread breakage caused by thread breakage.

Conventional technology An automatic single-spindle continuous lifting system that automatically moves along the spindle row of a spinning machine such as a spinning machine or a winding machine, extracts full bobbins one by one from the spindle, and supplies replacement empty bobbins to the spindle. A tube changer is known. By adopting such a doffing-type automatic tube changer, it is possible to effectively automate the spinning process and save labor, but there are problems specific to a single-spindle continuous doffing-type automatic tube changer. One point is that there is a considerable possibility that the tail yarn, especially the cut end thereof, may remain in an unstable state between the full bobbin that has been pulled out and the spindle of the spinning machine.

Problems to be Solved by the Invention To explain in more detail, the automatic tube changer that adopts the above-mentioned doffing method automatically travels along the spindle row of a spinning machine, for example, a spinning machine, and during this time, the main body of the automatic tube changer is The full bobbin is removed from the spindle by a dotting roll provided in the spindle. At this time, the tail thread wound around the lower end of the full bobbin unravels during removal and winds around the spindle blade in a spiral shape. The latter half of this tail yarn, that is, the yarn that is located on the spindle side of the spinning machine and is locked in a wrapped state, is punch-wound to the lower end of the empty bobbin when the spinning machine is restarted after doffing is completed. This allows the spinning machine to maintain stable spinning conditions with less yarn breakage. However, in the conventional single-spindle continuous lifting type automatic pipe changing machine, the yarn is cut by a clipper-type cutter that works together with the dotting roll and wound around the spindle. As the twisting shrinkage phenomenon occurs due to the reaction force of the twisting, the yarn shrinks into a rubber thread-like shape the moment it is cut by the hair clipper type cutter, and the untwisting torque causes the yarn wound around the spindle to shrink. The yarn may unravel and prevent the yarn from forming a punch winding on the spindle, causing the so-called "looping phenomenon."
Alternatively, a "bridging structure" of intertwined yarns may be formed between adjacent spindles located upstream as viewed from the running direction of the automatic tube changer to prevent the empty bobbin from being inserted into the spindle. or The incomplete punch winding and the "bridging structure" of the yarn formed in this way can cause thread breakage due to poor punch winding or empty bobbin insertion when the spinning machine is restarted after doffing is completed. This causes a large number of occurrences and significantly impedes improvements in the operating efficiency of the spinning machine and the quality of the final product, yarn.

The main purpose of the present invention is to improve the locking function of the cut end of the tail thread, which can eliminate the above-mentioned problems that have occurred in the known single-spindle continuous lifting type automatic tube changer. An object of the present invention is to provide an entanglement prevention device.

Another main object of the present invention is to provide a tail thread entanglement prevention device for a single-spindle continuous lifting type automatic pipe changer, which is simple in structure and reliable in operation.

Means for Solving the Problems In view of the above object, the present invention is to extract full bobbins 1 one by one from the spindle 2 while traveling along the spindle row of the spinning machine, and to supply replacement empty bobbins to the spindle 2. In the single-spindle continuous lifting type automatic pipe changing machines A and D, the clipper-type cutter 5, which works together with the dotting roll 3 and the beat wheel 4, is operated along the operating range of the above-mentioned cutting machine, which faces the spindle row of the spinning machine. The automatic tube changer is equipped with a brush 7 that temporarily holds the cut end 6' of the yarn 6 pulled out from the full bobbin 1 and wound around the spindle 2 on the front of the main body of the automatic tube changer A/D. The gist of this paper is the tail thread entanglement spinning device of the machine.

Embodiment FIG. 1 is a front view of the device of the present invention, and FIG. 2 is a side view of its main structure. In these drawings, the automatic tube changing machines A and D automatically move the full bobbin 1 from the spindle 2 one by one while automatically traveling on a traveling rail (not shown) along the spindle row of a spinning machine, for example, a spinning machine, in accordance with a conventional method. An automatic doffing device of a single spindle continuous lifting type is provided so that an empty bobbin (not shown) can be supplied in place of the full bobbin 1 to the spindle 2 from which the full bobbin has been extracted.
A dotting roll 3 that performs a pulling operation on a full bobbin 1 having a yarn layer 8 fitted and supported by a spindle 2 is installed in the main body of the automatic tube changer A/D. It is rotatably mounted via a pivot shaft 9 arranged parallel to the running direction F, and a dotting roll 3 is installed at the rear of the dotting roll 3 when viewed from the running direction F of the automatic tube changers A and D. A beat wheel 4 is rotatably attached via a known power transmission mechanism to give a knocking effect to the cut end 6' on the spindle side of the yarn 6 pulled out from the yarn layer 8 of the fully loaded bobbin 1. On the other hand, the dotting roll 3 and the beat wheel 4
In the working area, there is a dotted full bobbin 1.
A clipper-type cutter 5 that applies a cutting action to the yarn 6 pulled out from the spinning machine is arranged substantially parallel to the spindle row of the spinning machine. The clipper type cutter 5 has a cylindrical cam 10 rotatably attached to the base end of the pivot shaft 9, and a cam follower (not shown) attached to the side of the body of the clipper type cutter 5. Utilizing this method, the pair of cutting blades 5a and 5b in the front and back can be relatively reciprocated, and the yarn 6 suspended between the full bobbin 1 and the spindle 2 can be sheared by the meshing engagement of the cutting blades 5a and 5b. It is configured as follows. The spindle side yarn end 6' of the thread 6 cut by the clipper-type cutter 5 is attached to the blade 4 of the beat wheel 4 located behind the clipper-type cutter as the automatic tube changers A and D run. ', it is knocked down to the spindle 2 side.

In the present invention, the clipper type cutter 5 cuts the front surface of the main body of the automatic tube changer A/D facing the spindle row of the spinning machine over approximately the entire length of the operating range of the clipper type cutter 5. A brush 7 is provided to temporarily hold the cut end 6' of the yarn 6 on the spinning machine side until the blade 4' starts the knocking-off operation. By cooperating the brush 7 with the clipper type cutter 5, the cut end 6' of the yarn 6 pulled out from the full bobbin 1 and located on the spindle side is held at a substantially fixed position by the brush. Ru. Therefore, the cut ends 6' of the threads 6 are knocked off to the spindle 1 side by the blades 4' of the beat wheel 4, ensuring the formation of the "looping phenomenon" and the "bridging structure" of the tail threads. be prevented.

Effects of the invention As can be understood from the above explanation, by disposing a brush for twining and spinning the tail yarn in the operating area of the hair clipper type cutter, the cut end of the yarn that is pulled out from the full bobbin and wound around the spindle is is securely held in place on the brush until it is knocked off by the blade 4'.

By adopting the device of this invention, the risk of "looping" occurring in the tail yarn or "bridging structure" being formed between adjacent spindles is completely eliminated, and the spinning machine is operated. There is a significant improvement in reducing thread breakage during restart. Thus, the present invention has high practical value as it provides an effective technical means for improving yarn quality by reducing yarn breakage upon resumption of operation and improving productivity of the spinning process.

[Brief explanation of the drawing]

FIG. 1 is a front view of the device of the present invention, and FIG. 2 is a side view of the main structure thereof. 1...Full bobbin, 2...Spindle, A/D
... Automatic tube changer, 3 ... Dotsufing roll, 4
... Beat wheel, 5 ... Clipper type cutter,
6... Yarn, 6'... Cut end of thread, 7... Brush.

Claims (1)

[Scope of utility model registration request] In a single-spindle continuous lifting type automatic tube changing machine that moves along the spindle row of a spinning machine, it extracts full bobbins one by one from the spindle and supplies replacement empty bobbins to the spindle. A brush for holding the cut end of the yarn pulled out from the full bobbin is disposed on the front of the main body of the automatic thread changing machine, which faces the spindle row of the spinning machine along the operating area of the clipper-type cutter that cooperates with the beat wheel. A device for preventing thread entanglement in an automatic pipe changer, which is characterized by the following: