TWI709675B - Thread-feeding device and method for feeding threads to a circular knitting machine - Google Patents

Abstract

A thread-feeding device for circular knitting machines having yarn-striping devices (14), which has thread-conducting tubes (10), per yarn-striping device (14), in a number which corresponds to the number of threads which can be processed by the yarn-striping devices (14), the thread-conducting tubes (10) respectively being disposed between a receiving means (11) for a thread bobbin and a striper feeder (12) which precedes the yarn-striping device (14) and being provided with a thread-sensor mechanism (13), the thread sensor mechanisms (13) of all thread-conducting tubes (10) assigned to one knitting position (15) being evaluatable in common by one monitoring device and a stop signal being generatable by the monitoring device for the machine control upon detection of a thread fault.

Description

Silk thread feeding device and method for feeding silk thread to circular knitting machine by the thread feeding device

The present invention relates to a thread feeding device for a circular knitting machine. The circular knitting machine has a yarn picking device. For each yarn picking device, the number of thread feeding devices corresponds to the number of threads that can be handled by the yarn picking device. A number of wire guide tubes, the wire guide tubes are respectively arranged between the receiving device for the thread bobbin and the color-changing yarn feeder before the yarn picking device.

In the case of these conventional thread feeding devices of the yarn picker, a special color-changing yarn feeder is used for thread monitoring, and a stop device is provided for each thread at the exit of the color-changing yarn feeder. Once the thread of the spool is broken or the thread terminal is detected, the stop device will stop the machine. However, the stopping device is located directly in front of the knitting position, so that in the case of a fast-running knitting machine, after the thread breaks, there is often too little time left to stop the machine in time before a knitting error occurs due to a missing thread. In addition, with a special color-changing yarn feeder, only missing threads and not other thread errors can be monitored.

According to DE 38 33 969 A1, a yarn feeding device for a knitting machine is known, in which a sensor mechanism for detecting thread breakage at a certain distance in front of the knitting position is provided in the wire guide tube. However, this yarn feeding device cannot be used for the special requirements of a yarn picker, and likewise can only detect missing threads, but cannot detect other thread errors.

Therefore, the purpose of the present invention is to provide a thread feeding device for a circular knitting machine. With the thread feeding device, all thread errors that occur can be reliably detected, and the yarn picker can be shut down in time when the error occurs. .

This purpose is achieved by a thread feeding device for a circular knitting machine. The circular knitting machine has a yarn picking device. The number of thread feeding devices for each picking device corresponds to the number of yarn picking devices that can be The number of thread guides to be processed. The guides are respectively arranged between the receiving device for the thread bobbin and the color-changing yarn feeder before the yarn picking device, and the guide tube is provided with a thread feel Detector mechanism, all thread sensor mechanisms assigned to a wire guide tube at a knitting position can be jointly evaluated by a monitoring device, and when a thread error is detected, a stop signal can be generated by the monitoring device for machine control.

In the case of the thread feeding device according to the present invention, a standard color-changing yarn feeder can be used. It can avoid the laborious threading of the thread to the stop device of the conventional special color-changing yarn feeder. In addition, the detection of thread errors occurs at a large distance in front of the knitting position, so that even in the case of a fast-running machine, the machine shutdown can take effect in time. Due to parallel monitoring of all threads supplied to a knitting position, in addition to thread breaks or thread ends, pattern errors can also be detected. For this purpose, the monitoring device is preferably capable of The machine control provides the pattern data of the knitted fabric, so that when a pattern error is detected, it can generate a stop signal for the machine control.

The guide wire tube can thus have at least one wire turning point, and the wire sensor mechanism can be arranged in the region of the turning point. The thread thus automatically abuts against the sensor mechanism. It is thus particularly advantageous if the thread sensor mechanisms are respectively arranged in the part of the guide wire tube away from the knitting position. The greater the distance between the sensor mechanism and the knitting position, the longer the time available for stopping the machine.

The wire sensor mechanism can preferably have conductive or optical sensors. Using these sensors, not only thread breaks but also other thread errors are detectable.

For the yarn picking device, the thread sensor mechanism should be able to monitor the appearance and movement of the thread in the guide tube, so as to prevent knitting errors. Preferably, such a sensor mechanism is thus used.

If the thread sensor mechanism also monitors the thread quality, further advantages arise. In this case, if for example a yarn knuckle is detected, the machine can also be shut down.

In addition, the present invention relates to a method for feeding a silk thread to a circular knitting machine with a thread feeding device. The circular knitting machine has a yarn picking device, and the number of silk feeding devices corresponds to the energy of each picking device. The thread guide tube of the number of threads processed by the yarn picking device. The thread guide tubes are respectively arranged between the receiving device for the thread bobbin and the color-changing yarn feeder before the yarn picking device, and the thread guide tube is provided with silk threads. Sensor mechanism, this method is characterized by the following steps: a. Thread a single thread into the guide tube of the yarn picking device respectively And also to the color-changing yarn feeder; b. With the help of the sensor mechanism provided in the guide tube, monitor the appearance and movement of all the threads in the guide tube designated to a knitting position; c. . With the help of a monitoring device, evaluate all the signals of the sensor mechanism assigned to a wire tube of a knitting position; d. If the monitoring device does not detect the thread and/or in one of the wire tubes If no moving thread is detected in any one of the guide wire tubes, the machine stop signal is triggered.

Compared with the conventional method of thread monitoring in the case of the yarn picking device, here not only the thread is broken or the thread ends, but also whether the thread is moving in at least one guide tube (that is, whether the thread is fed to the knitting Location) thereby being monitored. Therefore, the method according to the present invention achieves significantly more than the conventional method, which causes more knitting errors to be avoided.

In addition, if one of the sensor mechanisms detects the yarn knuckle, even when the monitoring device triggers the machine stop signal, the monitoring method can be used to further increase the quality control.

10: Guide wire tube

10.1: turning point

10.2: Turnaround

11: spool holder

12: Color changing yarn feeder

13: Sensor mechanism

14: Yarn picking device

15: Knitting position

Figure 1 shows a preferred embodiment of the thread feeding device.

Figure 1 thus schematically shows a thread-conducting tube 10, which is set on a bobbin creel 11 and discolored Between striper feeder 12. The guide wire tube 10 has two turns 10.1 and 10.2 at 90°, respectively. The sensor mechanism 13 with a conductive or optical sensor (not shown in more detail) is arranged further away from the turning point of the color-changing yarn feeder 12 10.2. The sensor mechanism 13 monitors whether the thread is located in the wire guide tube 10, whether the thread is moving, and whether the thread may have slubs. There are as many yarn-striping devices (yarn-striping device) 14 connected to the color-changing yarn feeder 12 as the yarn-striping device 14 with the sensor mechanism 13 that can handle the same number of thread guides 10 so as to be assigned to each of the color-changing yarn feeders 12 One. The yarn picking device 14 then respectively guides one of the threads of the guide tube 10 to one or more knitting positions 15 of a circular knitting machine. Furthermore, more than one yarn picking device 14 can be assigned to one knitting position 15 in order to increase the number of possible colors. In each case, all the sensor mechanisms 13 of the guide wire tube 10 assigned to a knitting position 15 are jointly evaluated by a monitoring device (not shown in more detail here). If the monitoring device detects a thread break, thread end or yarn knot in one of the guide tubes, it triggers a machine stop signal. In addition, if the wire is actually located in each wire guide 10 but the wire is not moving, the machine stop signal is triggered. Then, knitting errors during further operation of the machine can also be avoided.

10‧‧‧Guide wire tube

10.1‧‧‧Turnover

10.2‧‧‧Turnover

11‧‧‧Spool stand

12‧‧‧Color changing yarn feeder

13‧‧‧Sensor mechanism

14‧‧‧Yarn picking device

15‧‧‧Knitting position

Claims (6)

A yarn feeding device for a circular knitting machine, the circular knitting machine has a yarn picking device (14), the yarn feeding device for each yarn picking device (14) has a number corresponding to the number of The yarn picking device (14) handles the number of thread guides (10), and the guides (10) are respectively set in the receiving device (11) for the thread bobbin and the yarn picking device (14). ) Between the previous color-changing yarn feeders (12) and the thread guide tubes (10) are provided with a thread sensor mechanism (13), which is characterized in that all the guides assigned to a knitting position (15) The wire sensor mechanisms (13) of the wire tube (10) can be jointly evaluated by a monitoring device, and when a wire error is detected, a stop signal can be generated by the monitoring device for machine control; and it is characterized in that The monitoring device monitors all the threads supplied to the knitting position (15) in parallel, so that the thread sensor mechanisms (13) can monitor the appearance and movement of the threads in the guide wire tube (10), Moreover, the thread sensor mechanisms (13) can also monitor the quality of the thread. The thread feeding device according to the first item of the patent application, wherein the monitoring device can be controlled by the machine to provide pattern data of the knitted fabric to be manufactured by the circular knitting machine, and stop when detecting pattern errors The signal can be generated by the monitoring device for the control of the machine. The wire feeding device according to item 1 or 2 of the scope of patent application, wherein the wire guide tubes (10) have at least one wire turning point (10.1, 10.2), and the wire sensor mechanism (13) is arranged at The area of the turning point (10.2). The thread feeding device according to item 1 or 2 of the scope of patent application, wherein the thread sensor mechanisms (13) are respectively arranged on the wire guide tubes (10) away from the color-changing yarn feeder (12) Section (10.2). According to the thread feeding device described in item 1 or 2 of the scope of patent application, the thread sensor mechanisms (13) have conductive or optical sensors. A method for feeding a silk thread to a circular knitting machine with the silk thread feeding device described in the first item of the patent application, the circular knitting machine having a yarn picking device (14), and the silk thread feeding device The yarn picking device (14) has a number of guide tubes (10) corresponding to the number of silk threads that can be handled by the yarn picking devices (14), and the guide tubes (10) are respectively arranged on the supply thread Between the receiving device (11) for the tube and the color-changing yarn feeder (12) before the yarn picking device (14), and the wire guide tubes (10) are provided with a thread sensor mechanism (13), which It is characterized by the following steps: a. Thread a thread into the guide tubes (10) that are guided to the yarn picking device (14) and also to the color-changing yarn feeder (12); b. In order to determine the thread Mistakes, with the help of the sensor mechanism (13) provided in the wire guides (10), monitor the appearance of all the threads in the wire guides (10) assigned to a knitting position (15) , Thread movement or yarn knots; c. With the help of a monitoring device, evaluate all the sensor mechanisms (13) signals of the conduits (10) assigned to a knitting position (15); d. If the sensor device (13) detects a thread error in step b, the monitoring device triggers a machine stop signal.

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