JPS6014128B2 - Thread breakage detection method and device for spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for detecting thread breakage in a thread cutting machine.

The conventional method for detecting yarn breakage in a grain grader is to shine a light beam onto the yarn running between the front roller and the snell wire of the grain grader, and use a light tube to detect the presence or absence of yarn in the light beam. It is done by sensing method.

For example, in the method disclosed in Tokuko Kou No. 256 Koyabu of the year 1987, the detection device using the optical fin tube is installed on top of a transition unit that traverses between precision machines, and as the transition unit moves, the detection device is installed in front of the transition unit. A break in the thread of the weight is detected. In addition to the above-mentioned method of detecting the thread path using a phototube, methods for detecting thread breakage include a method of detecting the vibration of the thread while the paper is coming out using a snell wire, and a method as disclosed in the Japanese Patent Publication No. 48 of 1973. , a lever member is provided with a snell wire at one end and a beam energy absorbing portion at the end of the pond;
When the yarn breaks, it loses its support from the Snell wire, causing the locking member to swing, causing the light energy absorbing member to move downward and detect yarn breakage by absorbing the light that flows along the front surface of the silk spinning machine along the machine base. There is a way. Furthermore, as disclosed in Hakama Kosho No. 72 Publication, a yarn breakage sensing member running at a constant speed is arranged in front of a textile machine such as a textile machine. There is a method of detecting thread breakage by determining whether or not the thread hits a sensing member while traveling along the machine base.

These conventional methods for detecting yarn breakage include detecting yarn breakage through a member that comes into contact with the yarn during spinning, or detecting yarn breakage without contacting the yarn using a phototube. One of two methods is to deploy a transition unit that uses Detection Hishi Nao between Yokogami machines.

Using a capital material that comes into contact with the yarn being graded has the risk of increasing the number of yarn breakages due to the yarn breakage detection operation, and if a transfer unit is used, only the weight in front of the transfer unit can be detected. Furthermore, in any of the above cases, a large amount of installation cost is required. SUMMARY OF THE INVENTION An object of the present invention is to overcome the drawbacks of the conventional methods and to provide a method and apparatus for detecting yarn breakage in all spindles of a spinning frame at low cost and with easy operation.

The purpose of the present invention is to apply an incident light beam into a pneumatic duct, photoelectrically detect the scattered light generated each time a floating fiber passes through the incident light beam, and convert it into an electric pulse. This is achieved by a method of detecting yarn breakage in a yarn spinning machine by using fibers floating in a pneumatic duct, which is characterized in that yarn breakage is detected by generating a detection signal when the value exceeds a value. Further, the thread breakage detection device for a fine loom according to the present invention for carrying out the above method comprises a thread breakage detection device and an arithmetic alarm device, and the thread breakage detection device includes a light projector consisting of a light source and a light projecting lens, and a concentrator. A condenser consisting of an optical lens and a photoelectric element is arranged such that the incident light east of the floodlight and the axis of the condenser substantially intersect at a point within the pneumatic duct, and the arithmetic alarm The apparatus is characterized in that it comprises an amplification comparison and determination means that emits a signal when the frequency of electric pulses from the photoelectric element exceeds a predetermined value, and an alarm circuit that is activated by the signal. The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

A pneumatic spinning machine is usually equipped with a pneumatic device for suctioning and collecting fleece generated due to thread breakage.

The pneumatic device is shown schematically in FIG.
A pneumatic fleet 3 equipped with suction holes corresponding to each spindle of the spinning machine, a pneumatic duct 2 for transferring fleece together with outside air from the pneumatic fleet, a storage box for storing the transferred fleece, and a suction fan. It consists of a pneumatic absorption device housing case 1 consisting of: The pneumatic duct 2 is shown as two ducts with the same shape in Figure 1, but depending on the amount of air passing through the duct, the diameter of the pneumatic duct 2 gradually increases from the position farther from the suction fan to the position closer to the suction fan. It is designed to achieve uniform suction. Two pneumatic ducts are usually installed, one on each side of the mill, near the pneumatic absorption device storage case, but the
In some cases, the pneumatic ducts of books are integrated into one just before the storage case 1 and connected to the storage case.
The thread breakage detection device according to the present invention includes a thread breakage detection device 10 and a calculation alarm device 20.

As shown in FIG. 1, a yarn breakage detection device 1 is installed in a weaving section of a pneumatic duct 2 close to the storage case 1.

As shown in FIG.
The inclination angle of the condenser is adjusted in advance so that the focal point of the condenser substantially coincides with the path of the incident light from the projector, and the condenser is fixed to the thread breakage detection diamond straight mounting member 11. At that time, concentrator 1
In order to improve the sensitivity of the light source 6, the light projector 12 and the light condenser 16 should be installed so that the focus of the light beam incident on the light projector 12 substantially coincides with the focus of the light beam condensed by the light condenser 16. is more preferable. When the yarn breakage detection device 10 is attached to the pneumatic duct 2, the attachment member 11 is attached to the pneumatic duct 2 by bolts or other suitable means.
This is achieved by fixing the In order to facilitate the task of aligning the relative positions of the projecting light beam and the condensing light beam,
An angle adjustment fixing member is interposed between the projector 12 and the mounting member 11 and between the light collector 16 and the mounting member 11, respectively, so that the angular position of the projector 12 and the light collector 16 can be freely changed, adjusted, and fixed. and preferable. Incidentally, the projector 12 and the condenser 16 can also be individually attached directly to the pneumatic main duct.

In this case as well, it is preferable to interpose the angle adjustment fixing member between each of the projector 12 and the condenser 16 and the mounting surface of the pneumatic duct. The floodlight 12 includes a light source 14 and a floodlight lens 13 that converges light emitted from the light source,
The light source 14 is connected to three power sources via a conductor 15. The condenser 16 includes a condenser lens 17 for condensing scattered light from fibers that shine upon receiving the projected light, and a photocell 18, and the photocell 18 is connected to the two arithmetic alarm devices via a conductive wire 19.

The arithmetic alarm device 2, for example, the amplification comparison and determination means 21,
For example, as shown in FIG.
It consists of a comparison circuit 22, an integration circuit 23, and a comparison circuit 24.

A predetermined set voltage Vr serving as a comparison reference is applied to the comparison circuit 24 . Various types of equipment can be used as the alarm device (2) of the alarm circuit 25.

For example, as shown in FIG. 1, an alarm display lamp disposed at the end of a frame of a spinning machine can be used as an alarm. An alarm indicator lamp is convenient for informing a worker located at a distance from the spinning machine of the existence of a spinning machine with yarn breakage.

Furthermore, if the warning indicator lamp is made to blink, it will be useful to notify the operator of the presence of the thread trimming table more quickly. Furthermore, by concentrating the warning indicator lamps of the multiple yarn spinning machines in the spinning room at a specific location in the spinning room, it is possible to centrally monitor the yarn breakage status of the spinning machines in the spinning room. It is useful for comprehensively understanding and managing the discoveries and the spinning status of each silk spinning machine. The alarm can also be used in conjunction with a buzzer or an alarm indicator lamp.

If the frequency of thread breakage indications is low and therefore the number of workers in the paper mill is relatively small, it is effective to notify the workers of thread breakage by a buzzer. Detection of thread breakage by the device of the present invention is performed as follows. When yarn breakage occurs in the spinning machine, the fleece sent out from the draft section corresponding to the broken bell is sucked through hole 3 of the pneumatic fleet, passes through the pneumatic duct whose diameter gradually increases, and heads toward the storage case. and finally stored in a pneumatic fleece storage box (not shown). As shown in FIG. 1, the fleece passes through the thread breakage detection device located adjacent to the pneumatic absorption device housing case in the pneumatic main duct, and then passes through the duct as shown in FIG. dispersed into a large number of fibers 40 or a plurality of fiber groups (hereinafter referred to as fibers 40 for simplicity) by an air flow,
Proceeds by floating inside the duct.

When light is incident by the projector 12 into the pneumatic main duct in which a plurality of fibers 40 are irregularly scattered as described above, the light is scattered by the fibers, and when observed from a direction facing toward the incident light, the incident light is The passageway will appear to be shining.

The photocell 18 of the collector, which is focused towards the optical path of said incident light, is therefore sensitive to each shine of the incident light by being scattered by the fibers, i.e. by the Tyndall phenomenon, and generates a pulse. . Photocell 1
The pulse output from 8 is applied to the arithmetic alarm device 20' via a conductor 19. The pulse passes through an amplifier circuit 21 and a comparator circuit 22 and reaches an integration circuit 23, where it is integrated. The behavior of the pulse in the calculation alarm device 20 is
This is shown in Figures a, 4b and 4c. 4a shows the output waveform of the amplifier 21, FIG. 4b shows the output waveform of the comparator 22, and FIG. 4c shows the output waveform of the integrating circuit 23. Looking at the relationship between the amount of fibers floating in the pneumatic main duct and the pulses in Figure 4b, it can be seen that when there are few yarn breaks and the amount of fibers 40 floating in the pneumatic duct is small, the frequency of pulse generation is As the number of broken threads per hakama spinning machine increases, the frequency of pulse generation increases as shown in period tb, although the number is small as shown in period tb. On the other hand, if the yarn breakage is repaired and the amount of fibers 40 floating in the pneumatic duct is reduced, the frequency of pulse generation will decrease as shown in 2 again. Therefore, when there are many fibers 40 floating in the pneumatic duct, the frequency of pulse generation is high, and as a result of the cumulative integration of the pulses, the integrated voltage level in the integrating circuit 23 becomes high as shown in FIG. 4c. Further, when the number of yarn breaks is small, the cumulative integrated voltage level in the integrating circuit 23 cannot be increased. The output signal of the integrating circuit 23 is input to the comparing circuit 24.

The comparison circuit 24 is given a reference setting voltage Vr, and the output signal from the integrating circuit 23 and the setting voltage Vr are
When the voltage level of the output signal is higher than the level of the set voltage Vr, the alarm circuit 25
is driven. In this case, by making the level of the set voltage Vr variable, it is possible to arbitrarily set the number of thread breaks in the fine loom that should trigger the alarm, and as a result, the number of yarn breaks in the fine loom can be set arbitrarily. It is possible to arbitrarily adjust the set voltage according to the paper output conditions such as the raw material of the yarn, the yarn count, etc., and determine the number of yarn breakages at which the arithmetic alarm device is activated. In the present invention, 4
Although the alarm device can be activated for one thread breakage per zero-thread construction machine, it is usually activated for two or more thread breakages. The device of the present invention is a device that applies light to the fibers floating in the pneumatic main duct, detects the light scattered by the fibers, and issues an alarm, so there is no need to come into contact with the yarn being spun. , Yarn breakage can be detected without affecting the spinning condition.

Furthermore, since there is no need to install a sensing member on each weight of the steel mill or a transition unit for moving the sensing member between machines, the apparatus of the present invention can be manufactured much more cheaply. It can also be installed on the existing stand of a silk spinning machine by simple modification.

[Brief explanation of drawings]

Fig. 1 shows a thread breakage detection device according to the present invention installed in a new machine for a silk spinning machine.
Fig. 2 is a sectional view showing the detection device of the thread breakage detection device installed on the cut surface of the pneumatic duct; Fig. 3 is a perspective view showing the alarm device of the thread breakage detection device. FIG. 4A is a diagram showing the output waveform of the amplifier 21, FIG. 4B is a diagram showing the output waveform of the comparator 22, and FIG. 4C is a diagram showing the output waveform of the integrating circuit 23. 1...Pneumatic suction device storage case, 2
...Pneumatic duct, 3...Pneumatic flute, 10...Thread breakage detection device, 11...
・Thread breakage detection device mounting member, 12... Floodlight, 13
...Light projection lens, 14... Light source, 15, 19.
...Conducting wire, 14a...Projecting light beam, 16.
...-Concentrator, 17... Condensing lens, 18...
・Waot cell, 20... Arithmetic alarm device, 18a...
...・Focused light beam, 21 ...... Amplification circuit, 22, 24
... Comparison circuit, 23 ... Integrating circuit, 2
5... Alarm circuit, 30... Power supply, 40...
Floating fibers running inside the duct. Figure 1 Figure 2 Figure 3 Figure 4 a Figure 4 b Figure 4 c

Claims (1)

[Scope of Claims] 1. An incident light beam is applied into a pneumatic duct, and scattered light generated each time a floating fiber passes through the incident light beam is photoelectrically detected and converted into an electric pulse, and the frequency of the electric pulse is determined. A method for detecting yarn breakage in a spinning machine by using fibers floating in a pneumatic duct, characterized in that yarn breakage is detected by generating a detection signal when the value is greater than a predetermined value. 2. Consisting of a thread breakage detection device and an arithmetic alarm device, the thread breakage detection device includes a light projector including a light source and a light projecting lens, and a light condenser including a condensing lens and a photoelectric element. The axes of the concentrators are arranged so as to substantially intersect at one point in the pneumatic duct, and the arithmetic alarm device outputs a signal when the frequency of electric pulses from the photoelectric element exceeds a predetermined value. 1. A yarn breakage detection device for a spinning machine, comprising: an amplification comparison/determination means for emitting a signal; and an alarm circuit activated by the signal.