JPH0259103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tail thread detection device for a thread winding device with a tail thread forming device.

[Problems to be solved by conventional technology and invention]

There are various types of thread winding machines for forming thread packages, and they can be broadly divided into types that wind the bobbin by bringing it into contact with a rotating drum, and types that rotate the bobbin holder itself that supports the bobbin. . In any type of thread winding machine, a tail thread forming device may be installed which can wind the tail thread around one end of the bobbin prior to winding the thread package. When the formed yarn package is used in the next process, the rear end of the preceding yarn package is connected to the tip of the following yarn package, and the yarn supply in the next process is continuous over multiple yarn packages. This is to make it possible. Therefore, when yarn packages are produced in large quantities and used continuously in accordance with such a system, it is required that tail threads be formed on all yarn packages wound by the winding machine. . However, in reality, although the ratio is low, the current situation is that several percent, for example, about 2% of all yarn packages are wound without forming tail yarns. If such a thread package without a tail thread is passed on to the next process as it is, the supply of yarn will be interrupted in the next process, so conventionally such thread package cages without tail threads were discovered by manual inspection. The yarn is sent back from the next process and wound again using a winding machine to form a yarn package with tail yarns. Manufacturing a yarn package by rewinding increases labor costs and other expenses, and also causes problems such as deterioration of yarn quality due to rewinding.

The present invention solves the above-mentioned problem caused by the inability to form a tail thread in a conventionally known yarn winding machine equipped with a tail thread forming device, and makes it possible to detect the case where a tail thread is not formed prior to the formation of a thread package. The purpose is to provide a detection device.

[Means for solving problems]

The above-mentioned object of the present invention is to have a thread guide at one end for guiding the thread to the tail thread forming position of the bobbin, and the other end is pivotally supported on the frame of the winding machine to guide the thread guide to the tail thread forming position. a thread-forming rod that can be moved between positions proximate and remote from the thread-forming rod; and a thread-forming rod mechanically coupled to the thread-forming rod to move the thread guide of the thread-forming rod between the two positions. A tail thread detection device for a winding machine having a tail thread forming device comprising a movable actuating bar, wherein the tail thread detection device is located on a thread guide of said tail thread forming rod or in the vicinity of said tail thread forming position. a first detection means disposed at the tail thread supplying position for detecting whether or not yarn is being supplied to the tail thread supplying position and emitting a signal; a second detection means for detecting and emitting a signal; receiving signals from the first detection means and the second detection means;
a control device that issues a signal when the yarn guide moves to a position close to the tail yarn forming position and no yarn is being supplied to the yarn guide; This is achieved by a tail thread detection device for a winding machine with a tail thread forming device, which is characterized in that it includes a display instructing means for displaying and/or instructing to change the operating conditions of the winding machine.

The first detection means may be of any type as long as it can detect whether or not the thread is being supplied to the end thread supply position of the bobbin and can issue a signal. For example, the placement of a piezoelectric element on the yarn guide of a tail yarn forming rod, a micro switch placed in contact with the trajectory of the yarn fed through the yarn guide, or a light beam directed toward the trajectory of the yarn fed through the yarn guide. A phototube that emits and a light receiver that receives the light from the phototube can be used.

A micro switch or the like may be used as the second detection means, and this micro switch may be arranged to detect movement of the tail thread forming rod to the tail thread forming position, or may be arranged to detect movement of the corresponding actuating rod. It may be arranged so as to be detected.

The display instruction means may be an indicator such as a lamp or a buzzer that is activated by a signal from a control device, or a signal from the control device may be transmitted to a drive mechanism of a winding machine to control the rotating drum. It may also be configured as a mechanism for stopping the drive of or doffing.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing an embodiment of a tail thread detection device for a winding machine according to the present invention.

FIG. 1 shows a unit of a winding machine of the type in which a bobbin 1 is rotated in contact with a rotating drum 5 having a traversing cam groove to form a yarn package. As is well known, the bobbin 1 is fitted into a bobbin holder 3 that is rotatably supported on a cradle 4, and as shown in FIG. Provided at the front end.

The tail thread forming device of the winding machine shown in FIG. It consists of a forming rod 7 and an actuating rod 10 which rotates the tail forming rod 7 about a pin 9. One end 11 of the actuating rod 10 is pivotally connected to the tail thread forming rod 7, so that by moving the actuating rod 10 from side to side as shown by arrow B, the tail thread forming rod 7 is moved.
The thread guide 8 shown in FIG. 1 is rotatable between a position close to the tail thread forming position 2 and a position away from the tail thread forming position 2 by rotation in the direction shown by arrow A.

Next, the formation of the tail thread will be explained. That is, by pushing the actuating rod 10 (toward the left front side in FIG. 1), the tail thread forming rod 7 is rotated and the thread guide 8 approaches the tail thread forming position 2, and at this time, the thread is pushed into the thread guide 8. It gets captured and stays in place. When the thread starts running in this state, the thread is wound around the tail thread forming position 2 and a tail thread is formed. After the tail thread is formed, the actuating rod 10 is pulled in the opposite direction, and as a result, the tail thread forming rod 7 rotates and returns to its original position, and the running thread is removed from the thread guide 8 and is then wound normally. Picking will begin.

The tail thread detection device shown in FIG. It comprises a micro-switch 13 arranged so as to come into contact when it is moved closer to the yarn forming position 2. Piezoelectric element 12
The presence of the thread sensed by the amplifier circuit 14 is used as a signal.
After being amplified, the signal is transmitted to the arithmetic circuit (control device) 15. On the other hand, the micro switch 13 detects that the thread guide 8 of the tail thread forming rod 7 approaches the tail thread forming position 2, and the signal thereof is transmitted to the arithmetic circuit 15. Arithmetic circuit 15
is configured to emit a signal when it receives a signal from the micro switch 13 but does not receive a signal from the piezoelectric element 12. In the embodiment shown in FIG. The lamp 16 is turned on and the worker is informed that the tail thread has not been formed.
If the worker finds a unit of the winding machine in which the tail thread is not formed, the worker stops that unit and replaces the bobbin so that winding with the tail thread is performed again from the beginning. In this way, yarn packages can be produced continuously while preventing the occurrence of yarn packages without tail threads.

〔Effect of the invention〕

Since the tail thread detection device of the winding machine according to the present invention is constructed as described above, it is possible to prevent the occurrence of yarn packages without tail threads, and as a result, all thread packages are treated as having tail threads for the next one. It can be sent to the process. This not only helps increase efficiency in the next process, but also helps prevent cost increases and yarn quality deterioration due to rewinding.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a unit of a winding machine equipped with a tail thread detection device according to the present invention. 1... Bobbin, 2... Tail thread forming position, 5... Drum, 7... Tail thread forming rod, 8... Thread guide,
10... Actuation rod, 12... Piezoelectric element, 13...
...Micro switch, 15...Arithmetic unit, 16...
…lamp.

Claims (1)

[Claims] 1. A method for winding yarn onto a rotating bobbin placed in contact with a rotating drum or mounted on a rotating cylinder to form a yarn package, and prior to winding the yarn. A tail thread detection device for a winding machine with a tail thread forming device that forms a tail thread winding layer at one end of the bobbin, wherein the tail thread forming device guides the thread at one end to a tail thread forming position of the bobbin. A tail thread forming rod having a thread guide, the other end of which is pivotally supported by the frame of the thread winding machine, and capable of moving the thread guide between a position close to and a position away from the tail thread forming position. and an actuating bar mechanically connected to the tail thread forming rod to move the thread guide of the tail thread forming rod between the two positions, and wherein the tail thread sensing device is configured to detect the thread guide of the tail thread forming rod. a first detection means disposed on the guide or in the vicinity of the tail thread forming position to detect whether or not yarn is being supplied to the tail thread supply position and to issue a signal; and a tail of the thread guide of the tail thread forming rod. a second detection means that detects movement to a position close to the thread forming position and issues a signal; and upon receiving signals from the first detection means and the second detection means, the thread guide moves to the tail thread forming position. a control device that emits a signal when the yarn is moved to a position close to the yarn guide and the yarn is not being supplied to the yarn guide, and a winding machine that receives a signal from the control device to display that the tail yarn is not formed and/or a winding machine. 1. A tail thread detection device for a winding machine with a tail thread forming device, characterized in that the device comprises a display instruction means for giving an instruction to change the operating conditions of the winding machine. 2. Apparatus according to claim 1, characterized in that the first sensing means is a piezoelectric element arranged on the thread guide. 3. The device according to claim 1, wherein the second detection means is a microswitch placed on the movement track of the actuation bar. 4. The device according to claim 1, wherein the display instruction means is a lamp.