JPH07500883A - A device for controlling the thread path between a fixed thread package and a cyclically operated thread consumer. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Name: Control the yarn path between the fixed yarn package and the periodically activated yarn consumption device Device The present invention relates to a fixed yarn package and a yarn that operates periodically, such as a weft insertion device of a threadless loom. The present invention relates to a device for controlling a yarn path to and from a consumer device. The present invention provides a first velocity versus time A winding drum that is driven according to the diagram and a thread part to be wound onto the rotating drum. The yarn from the cage is fed substantially tangentially at the upstream end of the rotating drum, followed by From the winding surface of the drum to the drum shaft in front of the drum at the downstream or discharge end of the drum and guiding means for guiding the device toward the withdrawal point. The drum has a second speed vs. time A guide arm driven according to the diagram and whose free end extends beyond the winding surface of the drum. It works together with the system at the downstream end. This guide arm guides the thread from the winding surface towards the point of withdrawal. I will guide you to.

Devices of this type are disclosed in German patent no. 3.142.710 and German patent no. 3.417.786. In theory, it has important advantages compared to more standard types of devices. Ru. In this standard device, the thread is secured at the upstream end by a rotating take-up arm. It is wound onto a fixed drum. There, a thread clamp operates at the downstream end, pulling the thread It can be held on the winding surface of the drum or pulled out from the drum to be used as a yarn consuming device ) to release it for consumption.

It is generally important to note that the yarn length is first prepared on the drum in the form of spools and then unwound. In the best possible way, such as being released, but inserting it into the storage section of the prepared threadless loom, Consumed within a short time. From this point of view, the tension that may occur during yarn consumption Force forms one limiting factor. In particular, weft insertion of the latest threadless looms. At the ends, the tension increases substantially as a result of the unexpected actuation of the thread clamp. There is a possibility. Therefore, in order to avoid thread breakage, it is necessary to Treatment is usually required to dampen the threads at a certain stage. However, such treatment The time required for yarn consumption (weft insertion) is longer, and as a result, the time required for yarn consumption (weft thread insertion) is reduced. It will limit your abilities.

In the device according to the above-mentioned cited example, the tension generated during yarn consumption is Can be controlled without affecting the average yarn consumption time (weft insertion time) Theoretically, there are many possibilities. The reason for this is that in the type of device shown at the beginning, the yarn length is First, 11 in the form of a thread coil! , but there is a more flexible method, namely, thread From the moment when the yarn has to be fed to the yarn consumer, the guide arm must be rotated continuously. This can be done by decelerating the drum somewhat rapidly relative to the drum. This is because it would be Noh. Nevertheless, this device has not been accepted so far. I'm here. In the example cited above, the rotational movement of both the drum and the guide arm consumes yarn. It is pulled out from the main shaft of the device (wireless loom). This causes the speed of the drum to be in a fixed ratio to the speed of the yarn consuming device so that it is approximately constant in practice . The speed of the guide arm, on the other hand, is pulled from the drum drive via an eccentric gear. Served. The speed of this guide arm is controlled by the driver during the formation of the yarn feeding coil (yarn preparation stage). Initially, the drum speed is equal to the drum speed during the consumption stage (weft insertion stage of a threadless loom). and finally return to the drum speed level at the end of the consumption phase. be done.

In this method, weft thread insertion in a no-thread loom is carried out according to a speed vs. time diagram. It is theoretically possible to This speed vs. time diagram is plotted at the shortest possible period. Not only must the insertion take place, but the thread must also be braked, especially at the end of the insertion. To allow insertion to occur at the appropriate time without raising the tension of the thread to too high a level. but However, in this known device, during the weft thread insertion phase, the weft thread insertion motion is dependent on the thread movement. It is impossible to control or adapt to different types of threads.

The present invention improves the device described at the beginning so that the device can consume different types of yarn. The purpose is to make it suitable for optimal use.

According to the invention, this purpose is achieved by driving the drum and the guide arm with individual electric motors. This is achieved by It can be freely controlled by a control circuit consisting of various circuits. And in this circuit , the speed of the yarn consuming device and the periodically consumed yarn length, as well as the yarn to be consumed can be supplied with parameters to represent.

The expected parameters representative of the yarn handled by the weft insertion device of a no-thread loom are: 1. Maximum system tension obtained when braking the yarn, 2. Weft length 3. Thread type and thickness 4. Selection of the speed profile in which weft thread insertion is performed 5. Starting angle and control of the speed profile Dynamic angle and The expected fixed parameters are 6. Maximum permissible acceleration and deceleration determined by the individual drive motors 7. Maximum permissible acceleration and deceleration determined by the individual drive motors. capacity system speed 8. Loom speed is possible.

It should be noted that European Patent Application No. 0243565 (see example according to Figure 1) ) controls the thread path between the fixed thread package and the periodically activated thread consumer. The device is disclosed. This device consists of a winding drum and a and a guide arm that moves to control the withdrawal of the yarn collected on the drum, It uses individually controllable drives for winding and withdrawing the yarn. . However, this known device is based on a standard type device, i.e. a fixed supported drum. and a rotating winding arm for winding the yarn onto the drum.

In this known device, there are two yarn winding zones, i.e. the yarn feeding is carried out by a winding arm. a first winding zone in which the yarn is wound intermittently by a guide arm; It is essential to utilize the second zone that is transmitted.

If distinguished from the device according to the invention, this known device determines the withdrawal end of the thread. It is necessary to use a thread brake for this purpose.

As a result of this, drawing the thread from a fixed thread coil is not possible with the device according to the invention. It differs essentially from drawing the thread from a rotating thread coil.

The invention will be further explained below using examples with reference to the drawings.

Figure 1 shows a yarn according to the present invention arranged between a yarn package and a weft insertion device of a threadless loom. 4Ia device diagram.

Figure 2 shows a simplified speed profile and Figure 3 shows the trend of weft thread insertion over time. The insertion according to the conventional weft insertion control and the insertion according to the present invention are illustrated as a function of It is a comparative diagram.

1 shows, for example, a winding drum rotatably mounted around a fixed hollow shaft; At times, the drum is driven by the electric motor 2 via the gear 3 at a substantially constant speed.

The thread is pulled away from the thread package P (not shown hereafter) through the thread guide 4 and then moved to the rotating drive. It is wound up by the ram.

5 is a free end of a shaft 6 disposed on the free end surface of the winding drum 1 and supported within a fixed hollow shaft. The guide arm is shown attached to the. Axis 6 is variable by a second electric motor 7 driven at high speed. When in the preparation or winding stage, i.e. feeding the yarn to the weft insertion device When not, the guide arm is rotating at the same speed as the winding drum 1.

As soon as the weft thread insertion phase begins, the speed of the motor 7 is reduced. Depending on this speed The guide arm 5 is decelerated relative to the drum 1 which rotates in a constant manner, and the weft thread i is For example, it is fed through the guide hole 10 to a weft insertion device 11 operated by compressed air. It will be done.

The speed of the yarn during weft insertion is determined according to a predetermined pattern. It keeps changing depending on the trapezoid's velocity profile. In principle, this speed profile is can be stored in the automatic control circuit for both motors 2 and 7. is a continuous guide arm of low mass relative to a drum l rotating at a (virtually) constant speed. This can be done more precisely by making adjustments.

In the speed profile of FIG. 2, the respective times tl of the start and end of weft thread insertion and t2 are fixed. The braking angle β is determined by each yarn type, yarn length, and yarn thickness a. = F / m) It can be calculated from the heavy load that is considered to be compatible. On the other hand, starting The angles a, O, are determined by the inertia of the drive motor/guide arm assembly 5.7. It is.

During the weft thread insertion phase, the path of the guide arm is guided by a preprogrammed thread speed profile. Continuously control according to

The number of spools being pulled off the drum is controlled by several light sources in the withdrawal path. 12.13). Furthermore, code disks 8 and 9 respectively It is provided on a hollow drum shaft and a shaft 6 supported therein.

By detecting code discs 8 and 9, the relative angular positions of these code discs can be determined. can be understood at any time. By this, together with the count of the spools pulled apart, The weft thread tip position is known at any time during the weft thread insertion phase and can be positioned according to the speed profile. It can be compared with

At the same time, important detection means are provided, for example by means of load sensors on the guide arm. Detecting pressure or contact between the thread and the guide arm.

In the line section, the device according to the present invention would result in pulling out with extremely high tension using conventional control methods. The occurrence of problems (such as problem Methods that can be avoided by starting and adjusting this speed at will It shows.

International search report. , A71. . '17nn+. .

international search report Continuation of front page (72) Inventor Goris Johannes Josephus Henodorix Marie St. Enbi, NEL-5645 Easyindvorpen, Netherlands Aspat 3

Claims (3)

[Claims] 1. Fixed yarn packages and cyclically operated yarn consumption, such as weft insertion devices on zero-thread looms. a first speed versus time diagram driven to control the thread path to and from the device; a winding drum is provided, the winding drum transporting the yarn from the yarn package into the rotationally The material is fed substantially tangentially at the upstream end of the drum and wound onto the rotating drum. from the winding surface of the drum at the downstream or discharge end of the drum. The drum has guide means for guiding it towards the withdrawal point in the front drum shaft, said drum having a downstream end. is driven according to a second speed vs. time diagram at Co-operating with a guide arm extending beyond the winding surface, the guide arm directs the yarn from said winding surface. The drum and guide arm are independent of each other. at least the electric motor for the guide arm is programmed. It can be freely controlled by a control circuit equipped with a thread-consuming circuit. Parameters representing the yarn to be consumed in addition to the speed of the machine and the yarn length that is periodically consumed A device characterized in that it can supply. 2. Attach the code disks to the shafts of the two drive motors and connect these code disks. 2. The device according to claim 1, further comprising means for detecting the mutual positions of the wheels. 3. The guide arm is characterized in that it is equipped with a sensor that detects contact with the thread. A device according to claims 1 and 2.