JPH0313338B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a self-propelled yarn breakage state detection device, and particularly to a self-propelled yarn breakage state detection device that uses a traveling unit to detect the yarn breakage state of each spindle in a spinning machine such as a spinning frame, a roving frame, or a rolling and twisting machine. Regarding equipment. As is well known, in spinning machines such as spinning frames, roving frames, and stretching and twisting machines, it is necessary to detect yarn breakage during operation. One of the conventionally known methods for detecting thread breakage in spinning machines is to install a limit switch for each spindle, usually hold the arm of the limit switch with a thread, and when the arm is no longer pushed by the thread, it is detected that the thread is broken. There are known methods for detecting. However, this method has the disadvantage that the thread tends to get tangled in the arm of the limit switch, making it easy to break down, and that it is not possible to know in which part of the thread cutting weight the trouble has occurred. In order to solve this problem, a method has been proposed in which a photoelectric sensor (or photoelectric switch) is provided for each spindle to detect thread breakage in a non-contact manner. However, this method requires a photoelectric sensor to be installed for each spindle, so in a spinning machine that automatically spins yarn from a fiber bundle using several hundred spindles, the required number of photoelectric sensors is limited. This includes the problem of increasing the number of devices and making them extremely expensive. Also, this method
Since a photoelectric sensor must be installed between the rollers that draw fiber bundles such as rovings or slivers, a space is required to install the photoelectric sensor, and the photoelectric sensor and its wiring can cause air fluff to accumulate on the machine base. This also impairs operability in terms of operation and maintenance, making it difficult to use in practice. Therefore, a method has been proposed in which a traveling unit including a device for detecting yarn breakage using a photoelectric sensor is circulated around the spinning machine to manage the spindle. However, this method optically detects the yarn breakage of each spindle instantaneously when the traveling unit runs beside the spinning machine, so it is difficult to detect yarn breakage in relatively thick items such as fiber bundles. There is no problem in detecting it. However, when detecting thin threads, there were many malfunctions, which caused practical problems. This is because when detecting a thin thread using a traveling unit, there is a lot of fluff attached to the surrounding area of each weight, and there are reflective objects such as mechanical parts or brackets that easily reflect light. This is because not only the threads of each weight but also unnecessary objects such as fluff or reflective objects are detected while the machine is running. Therefore, the method of detecting yarn breakage by circulating a traveling unit equipped with a yarn breakage detection device around the spinning machine is used to detect fiber bundles and filaments being drawn. This method could not be used to detect the thread just before it was cut. Conventionally, limit switches have generally been used to detect such threads. Therefore, the main purpose of the present invention is to move the traveling unit around the spinning machine by circulating or reciprocating (scanning) it.
This device detects the breakage state of each weight by running it, and it can detect not only fiber bundles and filaments being drawn, but also thin threads without contact, and can detect fluff, etc. between the weights. It is an object of the present invention to provide a self-propelled thread breakage state detection device that can reliably prevent false detection and greatly improve detection accuracy. Another object of the present invention is to distinguish between a weight to be detected and a weight that is not in use (empty weight), and to detect only the weight to be detected in a broken state without generating an unnecessary alarm. It is an object of the present invention to provide a self-propelled thread breakage state detecting device that can discriminate the type of thread breakage state and facilitate the handling by an attendant depending on the type of thread breakage state. Still another object of the present invention is to provide a self-propelled yarn breakage state detection device that is not restricted in the running direction of the running unit. The basic idea of this invention is that for each weight, the output signal of the detection means is accepted only in the traveling area of the filament body (i.e., the detection area), and that there is a filament body to be detected, such as an intermediate part between the weights. The detection reliability is increased by not accepting the output signal of the detection means for the area where the detection is not performed (non-detection area). That is, as shown in FIG. 1, the present invention provides an industrial system that allows a traveling unit that travels across the drawing direction of the fiber bundle of each weight to photograph the fiber bundle or the feeding area and processing area of the fiber on the same screen. A television camera (ITV) is provided, and includes a detection means for detecting the presence of fiber bundles or fibers in the supply area when the fiber bundles or fibers come to a predetermined position on the screen; A gate signal generating means that generates a gate signal by detecting the fiber bundle or fibers in the supply area, and a fiber bundle in the processing area at at least one predetermined position on the screen during the gate signal period. Or yarn breakage including a memory retention circuit that detects the presence or absence of an image of the fiber and stores and retains the output when the image is present, and a logic circuit that determines the yarn breakage state based on the memory state of the memory retention circuit. It consists of a state determining means.
In other words, the presence of the fiber bundle or fibers in the supply area with a relatively large fiber width is determined when the fiber bundle or fibers in the supply area with a relatively large fiber width enters the detection position set on the screen, and the fiber bundle or fibers are detected at the determined position. The state of breakage of the fiber bundle or fibers at at least one location in the processing area is detected. More preferably, a large number of positions corresponding to the processing area are set on the screen, and the type of yarn breakage state is determined based on a combination of the detected output states of the large number of positions. The present invention will be further explained in detail below. The horizontal frequency of the NTSC ITV camera is
It is well known that the frequency is 15.75KHz and the vertical frequency is approximately 60KHz. Here, _a certain time _t2 after a certain time t1 has elapsed from the horizontal synchronization signal is shown in Figure 2A on the screen.
The area shown in Figure 2B will appear on the screen at a certain time _t4 after a certain time _t3 has elapsed since the vertical synchronization signal.
The area is shown in . Therefore, by appropriately selecting t ₁ , t ₂ , t ₃ , and t ₄ based on the horizontal and vertical synchronization signals, an area corresponding to an arbitrary area (hereinafter referred to as a cursor) can be drawn at an arbitrary position on the screen. ) can be specified. The situation is shown in FIG. 2C. Therefore, it is obvious that by combining the times t ₁ , t ₂ , t ₃ , and t ₄ with various values, it is possible to designate any number of cursors of any size on any part of the screen. Now, when the fiber bundle of the spinning machine as shown in Fig. 3 is displayed on the screen, the part of the supply area A of the fiber bundle, the area between each roller part of the spinning machine, that is, the processing area B. A plurality of cursors corresponding to each portion of the fiber bundle and the portion of the fiber bundle that is about to be wound around the tube can be generated as described above. Here, if the supplied fiber bundle is white, for example, the video signal voltage captured by the ITV will be high in the portion where the fiber bundle is present. Therefore, if the video signal voltage becomes high during the cursor period,
It can be determined that a fiber bundle exists in the area corresponding to the cursor on the screen. The present invention takes advantage of this point. However, in the present invention, the breakage of fiber bundles or fibers in the processing area is determined only after it is detected that the fiber bundles or fibers in the supply area enter a predetermined detection area. It is important to first determine whether the fiber bundle is present or in the non-detection area, and the cursor in the fiber bundle supply area for this determination is specially called a position cursor Cp. This position cursor creation index is only used to distinguish between the detection target area (each spindle) and other non-detection areas (between spindles), and is based on the time t ₁ from the horizontal synchronization signal,
The area corresponding to t ₂ is the detection target area, and t ₁ , t ₂
emphasis on the elements of Therefore, the time coordinates of other cursors are also t ₁ , t ₂ ,
By setting t〓, t〓, and combining t〓, t〓, it is possible to create an arbitrary number of cursors on the screen at the position directly below the position cursor. (Hereinafter, these will be referred to as detection cursors C ₁ , C ₂ , ..., Cn.) That is, in the present invention, position cursors Cp,
In combination with at least one detection cursor, preferably a plurality of detection cursors C ₁ , C ₂ , . In addition, in the above, the gate signal generating means detects that the fiber bundle or fiber in the supply area portion exists within the position cursor and generates a gate signal, and the detection cursor C ₁ , ..., Cn during the gate signal period. When the presence of a fiber bundle or fibers is detected, a memory holding circuit that stores and holds the detected output and a logic circuit that determines the yarn breakage state based on the memory holding circuit are appropriately created. FIG. 4 shows an example of the screen where each of the above cursors occurs, and the determination in that case is shown in the table below.

[Table] As is clear from the above description, the self-propelled yarn breakage state detection device of the present invention requires a large number of photoelectric switches to detect trouble between each roller part in a spinning machine with complicated roller parts. The biggest feature is that it only requires one ITV camera. In addition, since the width of the detection area of the weight to be detected can be set arbitrarily, it is possible to reliably prevent false detections caused by fluff accumulated between the weights or the structure of the spinning machine. When operating a spinning machine that includes a faulty weight in one part, it is easy to exclude the faulty weight from the detection target, and furthermore, since the running direction of the traveling unit can be set arbitrarily, it can be applied to patrolling around the spinning machine. Of course, it can be used by reciprocating (scanning) the spinning machine side. Furthermore, if a blower is installed on the traveling unit, compressed air can be blown onto the spinning machine except for the detection area where the filament is present, so the air around the spinning machine can be blown without disturbing the filament. Cotton can be removed. Furthermore, since it is possible to classify which roller part of the trouble-occurring weights the trouble is occurring by type, it is possible to select a treatment method depending on the type of trouble. Furthermore, since the present invention performs detection without contacting the filament, it has unique effects such as not disturbing the filament.

[Brief explanation of the drawing]

Fig. 1 is a side view of a traveling unit and a spinning frame according to an embodiment of the present invention, Fig. 2 A, B, and C are diagrams explaining a cursor set on a television screen, and Fig. 3 is a side view of a traveling unit and a spinning frame according to an embodiment of the present invention. FIG. 4 is a diagram showing a state in which a plurality of cursor combinations are generated on the screen according to the present invention;
It is. 100...Spinning machine, 200...Traveling unit,
201...ITV camera.

Claims (1)

[Scope of Claims] 1. A traveling unit that runs alongside a spinning machine in which a plurality of spindles are installed in parallel, across the fiber bundle or the stretching direction of the fibers of each spindle, is used to detect the yarn breakage state of each spindle. In the apparatus, the traveling unit is arranged to face a supply area and a processing area of the fiber bundle or fibers with respect to the drawing direction of the fiber bundle or fibers of each weight, and to be able to photograph the supply area and the processing area. comprising an industrial television camera, which detects the presence of a fiber bundle or fibers when the fiber bundle or fibers come to a position on the screen that is set based on a horizontal synchronization signal and a vertical synchronization signal; gate signal generating means for generating a gate signal by detecting the presence of a fiber bundle or fibers on the screen corresponding to the fiber bundle or fiber supply area; and processing of the fiber bundle or fibers in correlation with the gate signal period. a memory holding circuit that stores and holds the output when an image of a fiber bundle or fibers is received at a position on the screen in the area; and a logic circuit that determines a yarn breakage state based on the memory state of the memory holding circuit. A self-propelled thread breakage state detection device comprising a thread state determination means. 2. The self-propelled yarn breakage state detection device according to claim 1, wherein the self-propelled yarn breakage state detection device is a device for detecting a yarn breakage state of a spinning machine.