TW201615913A - Thread-feeding device - 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

Wire feeding device

The present invention relates to a wire feeding device for a circular knitting machine having a yarn picking device, and the wire feeding device has a number corresponding to a yarn which can be processed by the yarn picking device for each yarn picking device. The number of guide wires, the guide wires are respectively disposed between the receiving device for the wire bobbin and the color change yarn feeder before the yarn picking device.

In the case of these conventional wire feeders of the picker, special color change feeders are used for wire monitoring, which are provided with stop means for each wire at the exit of the color change feeder. Once the wire of the bobbin breaks or the wire end is detected, the stop device stops 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 the knitting error occurs due to the missing thread. In addition, with a special color changer, only missing wires, not other wire errors, can be monitored.

A yarn feed device for a knitting machine is known from DE 38 33 969 A1, in which a wire break is detected at a certain distance in front of the knitting position The sensor mechanism is disposed in the guidewire tube. However, this yarn feed device cannot be used for the special needs of the yarn picker, and similarly only the missing thread can be detected, but other thread errors cannot be detected.

Therefore, the object of the present invention is to provide a wire feeding device for a circular knitting machine. With the wire feeding device, all occurrences of wire failure can be reliably detected, and the yarn picking machine can be shut down in time when a mistake occurs. .

This object is achieved by a thread feeding device for a circular knitting machine having a yarn picking device, the thread feeding device having a number corresponding to each yarn picking device corresponding to the yarn picking device The number of processed wire guide wires, the guide wire tubes are respectively disposed between the receiving device for the thread bobbin and the color changing yarn feeder before the yarn picking device, and the wire guide tube is provided with a silk sense The detector mechanism, all of the wire sensor mechanisms assigned to the wire guides of one knitting position can be jointly evaluated by a monitoring device, and when a wire failure is detected, the stop signal can be generated by the monitoring device for machine control.

In the case of the wire feed device according to the present invention, a standard color change yarn feeder can be used. It is possible to dispense with the laborious threading of the thread into the stop device of the conventional special color change yarn feeder. In addition, the detection of wire 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's shutdown can take effect in time. Due to the parallel monitoring of all the wires supplied to a knitting position, pattern errors can be detected in addition to wire breaks or wire ends. For this purpose, the monitoring device is preferably capable of The pattern data of the knit fabric is provided by the machine control so that when a pattern error is detected, it can generate a stop signal for machine control.

The wire guide can thus have at least one wire turning point and the wire sensor mechanism can be placed in the region of the turning point. The wire thus automatically abuts against the sensor mechanism. This is thus particularly advantageous if the wire sensor mechanisms are respectively arranged in the portion of the wire guide that is remote from the knitting position. The greater the spacing between the sensor mechanism and the knit position, the longer it can be used to stop the machine.

The wire sensor mechanism preferably has an electrically conductive or optical sensor. With these sensors, not only the wire breaks but also other wire errors are detectable.

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

Further advantages arise if the wire sensor mechanism also monitors the quality of the wire. In this case, if, for example, a knuckle is detected, the machine can also be turned off.

Further, the present invention relates to a method for feeding a thread to a circular knitting machine by a wire feeding device, the circular knitting machine having a yarn picking device, and the wire feeding device has a number corresponding to each yarn picking device a guide wire tube for the number of wires processed by the yarn picking device, the guide wire tube is respectively disposed between the receiving device for the wire bobbin and the color changing yarn feeder before the yarn picking device, and the wire guide tube is provided with the wire Sensor mechanism, the method is characterized by the following steps: a. respectively threading a wire into a guide wire tube leading to the yarn picking device And also to the color change yarn feeder; b. monitoring the presence of the wires in the conduits assigned to a knitting position and also the movement of the wires by the aid of the sensor mechanism provided in the guide wire tube; Evaluating the signal of all of the sensor mechanisms assigned to the conduit of a knitting position with the aid of a monitoring device; d. if the monitoring device does not detect the wire in one of the wire guides and/or No moving wire is detected in any of the wire guides, triggering the machine to stop the signal.

In contrast to the conventional method of wire monitoring in the case of a yarn picking device, not only is the wire broken or the wire end, but also whether the wire is moving in at least one of the guide wires (ie, whether the wire is fed to the knitting at the end) Position) is thus monitored. Thus, the method according to the invention achieves significantly more than the conventional methods, which leads to more knitting errors being avoided.

In addition, if the monitoring device also triggers the machine stop signal, if one of the monitoring mechanisms detects the yarn knuckle, the quality control can be further increased by the monitoring method.

10‧‧‧Guide tube

10.1‧‧‧ Turning

10.2‧‧‧ Turning

11‧‧‧Wire holder

12‧‧‧Discolor yarn feeder

13‧‧‧Sensor mechanism

14‧‧‧Feeding device

15‧‧‧Knitting position

Figure 1 shows a preferred embodiment of a wire feed device.

Figure 1 thus shows schematically a thread-conducting tube 10 which is placed on a bobbin creel 11 and discolored. Between the striper feeders 12. The guidewire tube 10 has two 90[deg.] turns 10.1, 10.2, respectively. The sensor mechanism 13 with a conductive or optical sensor (not shown in more detail) is placed further away from the discoloration feeder 12 10.2. The sensor mechanism 13 monitors whether the wire is located in the wire guide 10, whether the wire is moving, and whether the wire is likely to have a slub. The guide wire tube 10 having the sensor mechanism 13 as much as the yarn which can be processed by the yarn-striping device 14 which is subsequently connected to the color-changing yarn feeder 13 is thus assigned to each of the color-changing yarn feeders 12 One. The picking device 14 then directs one of the wires of the guidewire tube 10 to one or more knitting positions 15 of a circular knitting machine, respectively. Again, more than one picking device 14 can be assigned to a knitting position 15 to increase the number of possible colors. In each case, all of the sensor mechanisms 13 assigned to the guidewire tube 10 of one knitting position 15 were jointly evaluated by a monitoring device (not shown in more detail herein). If the monitoring device detects a wire break, a wire end or a knuckle in one of the wire guides, it triggers a machine stop signal. In addition, if the wire is actually located in each of the guide tubes 10 but the wire is not moving, the machine stop signal is triggered. Moreover, in addition, during the further operation of the machine, knitting errors that can thus be avoided can occur.

10‧‧‧Guide tube

10.1‧‧‧ Turning

10.2‧‧‧ Turning

11‧‧‧Wire holder

12‧‧‧Discolor yarn feeder

13‧‧‧Sensor mechanism

14‧‧‧Feeding device

15‧‧‧Knitting position

Claims (9)

A thread feeding device for a circular knitting machine, the circular knitting machine having a yarn picking device (14), the thread feeding device having a number corresponding to each yarn picking device (14) corresponding to a wire guide tube (10) for the number of wires processed by the yarn picking device (14), the wire guide tubes (10) being respectively provided to the receiving device (11) for the wire spool and the picking device (14) Between the previous color changing yarn feeders (12), and the wire guiding tubes (10) are provided with a wire sensor mechanism (13), all of which are assigned to a knitting position (15) ( The wire sensor mechanism (13) of 10) can be jointly evaluated by a monitoring device, and when a wire failure is detected, the stop signal can be generated by the monitoring device for machine control. The wire feeding device according to claim 1, wherein the monitoring device is capable of controlling, by the machine, pattern data of a knitted fabric to be manufactured by the circular knitting machine, and stopping when detecting a pattern error The signal can be generated by the monitoring device for control by the machine. The wire feeding device according to claim 1 or 2, wherein the wire guide tube (10) has at least one wire turning point (10.1, 10.2), and the wire sensor mechanism (13) is disposed at The area of the turning point (10.2). The wire feeding device according to claim 1 or 2, wherein the wire sensor mechanisms (13) are respectively disposed at portions of the wire guide (10) away from the knitting position (15) (10.2). The wire feeding device according to claim 1 or 2, wherein the wire sensor mechanism (13) has conductive or optical sensing Device. The wire feeding device according to claim 1 or 2, wherein the wire sensor mechanism (13) monitors the occurrence of the wire in the wire guide tube (10) and the movement of the wire. The wire feeding device according to claim 6, wherein the wire sensor mechanism (13) also monitors the quality of the wire. A method for feeding a thread to a circular knitting machine by a wire feeding device, the circular knitting machine having a yarn picking device (14) having a yarn feeding device (14) for each yarn feeding device The number corresponds to the number of wires (10) that can be processed by the picking devices (14), and the wire guides (10) are respectively provided to the receiving device (11) for the wire spool and Between the color change yarn feeders (12) before the yarn picking device (14), and the wire guide tubes (10) are provided with a wire sensor mechanism (13), which is characterized by the following steps: a. a wire is threaded into the guide wire tube (10) leading to the yarn picking device (14) and also to the color change yarn feeder (12); b. is provided by the wire guide tube (10) With the aid of the sensor mechanism (13), the presence of the wires in the conduits (10) assigned to a knitting position (15) and the movement of the wires are monitored; c. with the aid of a monitoring device Evaluating all of the sensor mechanisms (13) signals of the conduits (10) assigned to a knitting position (15); d. if the monitoring device is in one of the conduits (10) Undetected A wire is detected and/or a moving wire is not detected in any of the wire guides (10), triggering a machine stop signal. A method for feeding a wire to a circular knitting machine by a wire feeding device according to the invention of claim 8, wherein if one of the sensor mechanisms (13) detects a yarn knot, the The monitoring device then also triggers a machine stop signal.