JPS642694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a plurality of yarns are processed in a plurality of similar processing sections (weights), and an electrical output representing the value of a processing parameter is output to each processing section in order to monitor the processing state. The present invention relates to a monitoring system device for a yarn processing machine, which is provided with a transducer.

A false twisting machine can be mentioned as one of these yarn processing machines. A false twisting machine has around 200 similar yarn processing sections (spindles) arranged in rows along the machine.

The yarn is drawn out from the supply package and passes through each processing section, which is a primary heater and a pin or friction type false twisting device, to produce a highly crimped yarn. It is also known to create a set yarn by treating it with a secondary heater before winding.

Over the last few years, false twisters have become more precise in controlling and monitoring heater temperatures and have been provided with secondary heaters to reduce yarn crimp. Heaters are controlled by multiple temperature setting devices, temperature indicators, and temperature detectors, but the temperature (or temperature error) is controlled by a common indicator in order to avoid checking the temperature by electrical switching means. Is displayed. These systems are equipped with suitable alarm means to indicate temperature abnormalities in each heater, allowing the operator to know the location of the malfunctioning heater. By setting the temperature range, you can know whether the heater temperature is above or below the control temperature. With these systems, the heater installed in the machine can be heated to, for example, 200°C.
It can be maintained within a range of ±2°C.

The false twister also has a yarn detector, which is used to indicate when the yarn is running out. This yarn detector is usually installed at each spindle position,
If it is detected that there is no yarn at a particular position, the supply of yarn to that position is stopped. Normally, a drive stop is activated to prevent wrapping around the feed roller.

Only recently has attention been paid to monitoring the quality of yarn. This is done in a small part by drawtexture (stretched false twisting method) or POY (partially
This was due in part to the advent of oriented yarns, and in part due to the demand for high quality yarns, producing the highest quality yarns and returning high capital investments in modern false twisting machines. It became important to maximize the Quality changes occur partly due to changes in the frictional properties of the yarn, and partly due to unregulated spinning processes, and changes also occur in the false-twisting process itself.

Up to a certain point, these quality changes can be tolerated. However, if the average quality of the yarn differs from the quality of other yarns processed at the same time on the same machine, or if the difference or variation exceeds a certain value over a partial length, then the When the yarn is made into cloth, it causes uneven dyeing and uneven appearance.

In view of the above issues, attempts have been made to monitor or control yarn quality in false twisting machines, and some of these attempts include systems similar to long-established heater temperature scanning systems. A method is included for scanning a tension measurement transducer in such a manner. This tension monitoring system arrangement is largely modeled after known temperature scanning system arrangements.

However, there are fundamental differences between temperature changes and tension changes, and these prior art tension monitoring system devices have been found to be less effective.

The present invention has been developed to provide an improved monitoring system apparatus particularly suited for monitoring parameters that vary yarn tension.

The monitoring system device for a yarn processing machine according to the present invention is a transducer that is provided corresponding to each weight of a yarn processing machine consisting of a plurality of weights, and that converts the value of the same parameter for yarn processing into an electrical signal. has
The transducers are divided into a plurality of groups, and the same number of yarn processing monitoring devices as the groups are provided, and the output of each of the transducer groups is determined by each of the yarn processing monitoring devices corresponding to the transducer group. A monitoring system device that connects each output of the plurality of yarn processing monitoring devices in series and sequentially inputs the outputs of the plurality of yarn processing monitoring devices to a common centralized monitoring device, wherein the plurality of yarn processing monitoring devices are connected to a corresponding group. A multiplexer that scans the electrical signals from the transducer in a short period in which fluctuations in the parameters do not adversely affect the performance of the yarn, temporarily stores and multiplexes the electrical signals, and sequentially sends out the electrical signals. and an A/D converter that converts the signal from the multiplexer.
ROM (Read Only Memory) device and RAM
(Random Access Memory) device, a CPU, and a data link controller, and after processing the signals from the A/D converter, the signals are sequentially multiplexed and sent to a central monitoring device via the data link controller. This is a monitoring system device for yarn processing machines.

Normally, a false twisting machine has a plurality of yarn processing sections (spindles) within the bay (span) and is composed of a plurality of bays. Each bay is connected to each other, and the end of the machine has a drive device and It has a control device for the machine.

In the present invention, each bay is equipped with at least one monitoring device that can scan the transducer group within a short period of time without parameter variations having an adverse effect on yarn performance.

When monitoring yarn tension, especially in modern high-speed false-twisting machines, short-term tension fluctuations can occur, for example due to a partial lack or excess of oil deposited on the yarn; This is regarded as an important drawback of yarn processing. In contrast, the heater temperature changes relatively slowly.
Conventional temperature monitoring systems intended for this purpose are unable to address the shortcomings of such short yarn processing.

However, even a 10% change in tension level lasting less than 1 second causes visual defects in textiles made from yarns undergoing this change.
When processing at a speed of 1000 m/min, an abnormal tension of 0.1 seconds will create an abnormal part of the yarn with a length of 1.67 m. Even if an abnormal portion of this length were to enter the fabric, the fabric would have significant defects.

The monitoring device can issue an alarm when a monitored process parameter reaches an acceptable limit. Adjusting processing parameter tolerance limits (eg, when processing different types or deniers of yarn) can be easily done. The ease of adjusting the tolerance limit can be made common to all monitoring devices, such as a common display and control device (centralized monitoring device) located at the control end (electrical panel) of the false twisting machine. ) can control the above monitoring device.

The monitoring device may include a microprocessor programmed to transmit selected information emerging from the transducer to a data processing device included in the central monitoring device. The monitoring device and the central monitoring device can be connected by a light guide (optical fiber). This is extremely useful in electrically noisy environments to avoid noise and interference from other nearby electronic devices.

The monitoring system device can monitor one or more parameters, including overall machine parameters and yarn parameters related to individual weights, such as heater temperature. As an example of the parameters of the entire machine, overfeed amount,
Examples include main shaft speed (yarn processing speed), traverse speed of the winding section, and gearbox temperature. The monitoring system device can be programmed to monitor different parameters at different time intervals. This is because, for example, gearbox temperature does not need to be sampled as often as yarn tension.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a monitoring system for a yarn processing machine according to the present invention will be described in detail below with reference to the accompanying drawings.

In the figure, Figure 1 is a schematic diagram of the false twisting machine, and Figure 2 is a schematic diagram of the false twisting machine.
3 is a block diagram of a monitoring system suitable for the machine shown in FIG. 3; FIG. 3 is a block diagram of a monitoring system of the monitoring system of FIG. 2; and FIG. 4 is a timing cycle diagram for a microprocessor of the monitoring system of FIG.

In the false twisting machine shown in FIG. 1, a plurality of package cages 13 of partially oriented yarn (POY yarn) are attached to a support (peg) 11 which is a part of a free-standing creel C. The yarn 12 is taken off from the package 13 by a feed roller 14 set on a shaft 15, and heated while being taken off by another feed roller 17, and then passed through a false twisting area 16.
pass through. This false twisting area 16 is provided with a curved contact plate heater 18 having two grooves and a Positorq (registered trademark) friction false twisting device 20 for each yarn. Feed rollers 17 move faster than rollers 14 at a ratio of about 1.6 to 1 to simultaneously false twist and draw the yarn. feed roller 1
At point 7, the yarn becomes a compressible crimped yarn, but cannot be compressed because it is subjected to a relatively high tension. However, the yarn is fed by a feed roller 17 to a relaxation zone 30 containing a second heater 19 and is then relaxed by another feed roller 21 which moves about 15% slower than feed roller 17 and is capable of compressing the yarn. Taken from area 30. Due to the heat treatment in this relaxed state, the yarn loses most of its tendency to shrink. The thread delivered by the feed roller 21 is wound up by a winding means 22, which normally moves somewhat faster than the feed roller 21, in order to create a stable winding package.

The yarn is traversed by a traverse guide 23 attached to a traverse bar 24 which is reciprocated by a traverse cam mechanism 25 and wound into a package cage. Traverse cam mechanism 25
It has a ribbon prevention mechanism 26 for preventing the winding yarn from becoming a ribbon. The false twisting device 20 is driven by a belt 27 attached to pulleys 28, 29 at both ends of the machine. Pulley 28 is connected to main drive motor 31. The main drive motor 31 can also drive all feed rollers and take-up rollers (winding means) via suitable transmission means.

The machine is composed of drive boxes (end legs) 32 and 33 at both ends that house a motor 31, pulleys 28 and 29 gears, and a timing belt that transmits power to the feed roller, and a bay 34 that has a plurality of yarn processing sections (weights). ing. For example, a machine with a 216 spindle processing section has nine bays with 12 spindles on one side of the machine and 24 spindles on both sides. As mentioned above, there are six first heaters 18 on one side of each bay, and 12 yarns can be heat-treated. The second heater 19 is a pipe-shaped heater and is installed in the heating chamber 35 together with 23 other heaters. 1 temperature sensor 3 in each heating chamber
End leg part (control end) with 6
It is connected to a temperature controller 37 in a heater control section 38 located at There are nine temperature controllers and temperature sensors throughout the machine. Similarly, the first heater 18 is connected to the heater control section 3.
A temperature sensor 39 connected to a temperature controller 40 in 8 is provided.

The tension is sensed on the exit side of the false twisting device, and a tension transducer 41, essentially a strain gauge, is arranged between the false twisting device 20 and the feed roller 17 of each yarn processing section. Therefore 24 in each bay 34
total, 216 transducers 41
is provided.

2 and 3 show the monitoring system arrangement for the tension transducer 41 of this machine. The monitoring system device comprises nine monitoring devices M ₁ , M ₂ ,...M ₉ , each connected to 24 transducers 41 in one of the nine bays of the machine, with Output information can be serially received, processed, stored and repeatedly scanned through the series of transducers 41. The monitoring devices M ₁ , M ₂ ,...M ₉ are a common central monitoring device 4 for monitoring system equipment.
Connected to 2. The central monitoring device 42 is housed in the control end leg 32 (see FIG. 1).The central monitoring device 42 also includes a video display unit (VDU) that displays information other than tension information, as will be described later. There is.

FIG. 3 shows an example of the monitoring devices M ₁ , M ₂ , . . . M ₉ . The monitoring device is a crystal controlled microprocessor 43 (preferably Intel8085).
It has a permanent memory (EPROM) 44 and a random access memory (RAM) 45 which are electrically programmed. 8755 EPROM (2K byte capacity) and 8155 RAM (256 8-bit words) are supplemented to the 8085 chip.
The 8155RAM and 8755EPROM have ports for data transmission to the outside. The system includes a control bus 48, a data bus 49, and an address bus 5.
It is equipped with 0. Tension inputs from the 24 tension transducers in the bay are multiplexed by a 25 transfer path multiplexer 51. (The twenty-fifth input is used as a check for the active excitation level from the dummy tension transducer 59.) The transducer is driven by a drive circuit 60.
The multiplexed tension input is converted by an AD converter 52 to a digital signal suitable for use in a microprocessor.

Multiplexer 51 is capable of fully addressing 25 tension transducers.
Controlled via 6-bit words from RAM 46.

Yarn tension in high-speed false twisting machines generally contains frequency components up to 30Hz. The appropriate number of sampling times is 80 times per second, and for all inputs, it is 80 times per second = 25 times per second.
2000 tension readings or one reading every 500 μsec. This is explained using a timing cycle as shown in FIG. 4 and below.

A1 (the amount of time data is retained in the integrator)
...5μ seconds A2 (time for multiplexer 51 to advance to the next position)
…20 μs A3 (time for data to convert from analog to digital)…30 μs A4 (time for integrator to switch to the next channel of sample)…50 μs A5 (time to calculate average values and test limits) …
40μs A6 (time during which the integrator monitors the tension signal for 400μs without receiving commands from the microprocessor; during this time the microprocessor controls the thread breakage alarm, data link to the central processor (see below), etc. )...400 µs This is repeated for each of the 25 tension channels C ₁ , C ₂ ,...C ₂₅ , each completing a scan for a total of 12.5 ms It takes. The tension signal is analyzed in a microprocessor, calculating its average value and checking the limits of the average tension. The instantaneous level is also checked to see if one of these tests exceeds a limit, and an alarm condition is triggered if necessary. Apparently averaging takes 2-3 seconds. The 256 samples of 8-bit data add up to 16 bits or two 8-bit words. Therefore, if 256 samples are selected for averaging work, then from the bay
The 24 tension average values can be reported to the central monitoring device in 2 x 24 = 48 words. 256 sampling takes 3.2 seconds, which is long enough to obtain the average tension.

The nine bays are datalink multiplexed to a central monitoring unit via a datalink controller (DLC) 54. It converts the data to serial form and performs a parity check for transmission on a single transmission line.

Yarn breakage detection is also monitored in the microprocessor, and inputs from 24 yarn breakage detectors are connected to inputs of EPROM 44 and RAM 45 via photocoupler 53. In this way, about half of the data link timing cycle can be used to report bay data, leaving the other half for other machine data such as heater temperature.

The system is capable of extremely fast tension scans with a sampling rate of 80 times per second for each yarn needed to capture transient off-limit tensions, and can be equipped with additional storage if necessary. and can have capacity for other parameters. This is done by continuously scanning the false twisting machine about 200 times in total, and
This ameliorates the shortcomings of conventional tension monitoring systems where each sampling takes 5-6 seconds, allowing significant periods of off-limit tension to pass unnoticed.

Data link controller (DLC) 54 is preferably connected to central monitoring device 42 by fiber optic coupling 55 and input and output optical fibers 56 and 57, respectively. This is to avoid noise from the yarn cutter, temperature controller and other adjacent electrical equipment on the machine.

The central monitoring unit 42 shown in FIG. ) 63. The optical fibers 56 and 57 are connected to a DMA controller 62 via an optical fiber coupling 64 and an SDLC 65.
It is connected to the. 8085 microprocessor 61
is a random access memory (RAM) 6 that receives data and holds it as a buffer until it is called by the 8085 microprocessor 61.
6 and retain information necessary to perform different workpieces and receive data from other sources such as temperature sensors, shaft speed, traverse speed, draw ratio, twist number parameters, overfeed amount, etc. A fixed storage device (ROM) 67 for analysis is provided. The DMA controller 62, acting through the PPI 63, has rapid access to the central supervisor's storage and can rapidly transfer blocks of data without any programming action from the microprocessor.

This machine can be programmed to perform the following tasks:

1 Communication and control using the monitoring devices M ₁ , M ₂ ,...M ₉ 2 Reception and analysis of data from the above monitoring devices 3 Display of necessary data regarding machine efficiency, tension average, thread breakage, etc. 4 Tension parameters, tension Input of external (eg, operator) instructions such as limits, data displays, calls, etc. A magnetic tape storage or other hard copy device 68 is provided for storing data.

In this way, conventional monitoring system devices require 5 to 6 seconds for sampling each weight, and for example,
With a machine with 216 weights, it took about 20 minutes to complete a scan of one machine, and it was not possible to capture the fluctuations in parameters such as tension over a very short period of time, but with the monitoring system of the present invention, As shown, 24 transducers (25 including dummies) connected to one monitoring device are scanned.
The process is completed in 12.5ms, and 256 samplings are completed in just 3.2 seconds. The data from each of the nine monitoring devices is serially transmitted to the central monitoring device, and it takes less than 3.2 seconds to transmit the signals from all the monitoring devices, compared to the time it takes to sample one spindle with conventional devices. The sampling signal processing for the entire 216-spindle machine was completed within the time it took. This makes it possible to reliably capture short-term fluctuations in parameters such as tension, which were overlooked by conventional monitoring systems. Therefore,
When such fluctuations occur, the central monitoring device can immediately warn or display these fluctuations, allowing operators to take prompt measures to correct defects and eliminate the causes of uneven dyeing and poor appearance. It is now possible to reliably catch defects in the quality of the yarn before they are detected in the dyeing, weaving, and other processes that involve post-processing the treated yarn. Further, by adjusting the scanning period of the transducer, it is possible to correspond to arbitrary parameters. Furthermore, in the conventional method of connecting all the 200 or more weight transducers to one central monitoring device, each wire is naturally connected to the central monitoring device for each transducer (usually located at one end of the machine). It is necessary to route the system for a long time, and the number of couplings corresponding to the number of couplings required increases accordingly, which also has drawbacks such as the generation of noise that causes abnormal operation of the monitoring system equipment. In contrast, in the present invention, the only long wiring that needs to be routed is the wiring between each monitoring device and the central monitoring device, and the number of such wires and the number of couplings are less than one-tenth of the conventional ones. This also has the effect of lowering costs and significantly reducing the probability of picking up noise that can cause malfunctions.

Although the present invention has been described above with respect to a monitoring system for a false twisting machine, which is a preferred embodiment of a yarn processing machine, it goes without saying that the present invention can be applied to other yarn processing machines.

It goes without saying that the system device of the present invention can be modified and functions can be added. In addition to warning of abnormalities in individual yarns, the monitoring system device of the invention can also shut down the heaters for the entire bay (e.g. when the secondary heater temperature exceeds a limit) or shut down the entire machine (e.g. when a gear overheats). It can also be stopped.

[Brief explanation of drawings]

The drawings show an embodiment of a monitoring system device for a false twisting machine according to the present invention; FIG. 1 is a schematic diagram of a false twisting machine, and FIG. 2 is a block diagram of a monitoring system device suitable for the machine shown in FIG. 1. 3 is a block diagram of the monitoring device of the system device of FIG. 2, and FIG. 4 is a timing cycle diagram for the microprocessor of the monitoring device of FIG. 3. 11... Support, 12... Yarn, 13... Package, 14... Feed roller, 15... Shaft, 16... False twister, 17... Feed roller, 18
...First heater, 19...Second heater, 20
... false twisting device, 21 ... feed roller, 22 ... winding means, 23 ... traverse guide, 24 ...
Traverse bar, 25...cam mechanism, 26...ribbon prevention mechanism, 27...belt, 28, 29...
Pulley, 30... Relaxation area, 31... Main drive motor, 32, 33... End leg (32... Control end leg, 33... Drive end leg), 34... Bay, 35... Heating chamber, 36... …
Temperature sensor, 37...Temperature controller, 3
8... Heater control section, 39... Temperature sensor,
40... Temperature controller, (for first heater), 41... Tension transducer, 42...
...Centralized monitoring device, 43...Microprocessor, 44,67...Fixed storage device, 45,46,
66... Constant speed access storage device, 48... Control bus, 49... Data bus, 50... Address bus, 51... Multiplexer, 52... AD
Converter, 53... Photocoupler, 54... Data link controller, 55... Optical fiber coupling, 56... Input optical fiber, 57
... Output optical fiber, 58 ... Keyboard, 5
9...Dummy tension transducer, 60...
Drive circuit, 61...Microprocessor, 62...
...Direct memory access controller, 63...Programmable peripheral interface, 64...Fiber optic coupling (light guide coupling), 65...SDLC, 68
. . _. magnetic _tape storage or hardcopy device, C _. . . creel, C _{1 ,} C ₂ , .

Claims (1)

[Claims] 1. A yarn processing machine consisting of a plurality of weights has a transducer that is provided corresponding to each weight and converts the value of the same parameter for yarn processing into an electrical signal,
The transducers are divided into a plurality of groups, and the same number of yarn processing monitoring devices as the groups are provided, and the output of each of the transducer groups is determined by each of the yarn processing monitoring devices corresponding to the transducer group. A monitoring system device that connects each output of the plurality of yarn processing monitoring devices in series and sequentially inputs the outputs of the plurality of yarn processing monitoring devices to a common centralized monitoring device, wherein the plurality of yarn processing monitoring devices are connected to a corresponding group. A multiplexer that scans the electrical signals from the transducer in a short period in which fluctuations in the parameters do not adversely affect the performance of the yarn, temporarily stores and multiplexes the electrical signals, and sequentially sends out the electrical signals. and an A/D converter that converts the signal from the multiplexer.
ROM (Read Only Memory) device and RAM
(Random Access Memory) device, a CPU, and a data link controller, and after processing the signals from the A/D converter, the signals are sequentially multiplexed and sent to a central monitoring device via the data link controller. Monitoring system device for yarn processing machine.