JPH0138892B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a self-propelled yarn breakage state detection device for a spinning machine, and more particularly to a self-propelled yarn breakage state detection device for a spinning machine that uses a traveling unit to detect the state of yarn breakage of each spindle in a spinning machine such as a spinning frame, a roving frame, and a rolling-twisting machine. The present invention relates to a thread breakage state detection device. In the past, Japanese Patent Publication No. 48-4892, for example, has proposed a method of managing spindles by circulating a traveling unit including a device for detecting yarn breakage using a photoelectric sensor around a spinning machine. However, according to this method, when detecting the breakage of the spun yarn, the processed yarn is first detected, and then the supplied yarn of the same spindle is detected, which is necessary for normal operation. It has become an essential requirement.
Therefore, even when detecting a yarn breakage state mounted on a traveling unit, this detection order must be followed. Therefore, if the relative position of the photoelectric sensor is set so that it operates normally when the traveling unit moves to the right along the side of the spinning machine,
When moving to the left on the side of the spinning machine, the above-mentioned detection order is completely reversed, so there is an inconvenience that a judgment result indicating that all the spindles are abnormal is output. One of the purposes of installing this type of device is to scan the side surface of the spinning machine as frequently as possible to detect yarn breakage early and prevent the problem from expanding. If the direction is restricted to only a certain direction due to the yarn breakage state detection circuit, it is not possible to reciprocate the side surface of the spinning machine. For this reason, it is necessary to install a rail that goes around the spinning machine, which has the drawback of increasing equipment costs. Furthermore, since the traveling unit must also take time to travel through parts where there is no yarn, such as the driving part of the main body of the spinning machine, the efficiency of detecting yarn breakage, which is the original purpose of this type of device, decreases. This includes a fatal inconvenience. Furthermore, as a method for detecting thread breakage using multiple optical detectors, for example,
No. 2 is proposed. However, the main proposal for this method is to install a set of optical detectors with specially set optical axes in order to detect roll wrap (a problem in which the yarn is wrapped around a roller), and to detect the fullness of the yarn. In order to detect the tube condition (the condition in which a specified amount of filament is wound around the tube yarn), another set of optical detectors with a specially set optical axis is used. A separate optical detector is installed, and when an abnormality is detected in the filament body, a slit cutting machine is activated to prevent the problem from expanding. Here, if the optical axes of these optical detectors accurately correspond to each corresponding location on the filament body, normal operation is expected, but as the carriage moves, it is possible to detect abnormalities in the filament body. The premise is to detect. However, the optical axis of the optical detector described above cannot be expected to operate normally until it accurately reaches a predetermined position on the filament. For example, if the optical detector is energized by light reflected from the structure of a spinning machine or from fluff that has accumulated over a long period of time, the result will be determined to be normal even if the yarn is broken. There is an inconvenience in deriving . Furthermore, according to this method, it is necessary to install a counter C and count the pulses in order to detect the state of thread breakage, so there is an inconvenience that the detection time per spindle becomes long. . As described above, in any case, the conventional methods do not take into consideration a method for ensuring accurate detection of the yarn breakage state even if an error occurs in the optical axis of the optical detector. However, the above is an unavoidable problem when developing this type of device. This is because the carriage moves along the rail, but the optical detector is fixed to a structure on the carriage, so the relative position between the filament and the optical axis of the optical detector affects the accuracy of rail installation. Because it will be done. Furthermore, at production sites, there is a lot of fly fluff, which gets caught up between the rails and wheels and accumulates, which inevitably causes optical axis misalignment after long hours of operation, interfering with normal operation. There is a problem that In this way, in a device that detects the presence or absence of an abnormality in a filament mounted on a running unit, a system that provides an arbitrary tolerance value for the deviation of the optical axis of the optical detector and It is necessary to develop a method that has no restrictions and is completely unaffected by fluff or the structure of the spinning machine. 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 yarn breakage state detection device for a spinning machine, which 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 yarn breakage condition detection device for a spinning machine that can determine the type of yarn breakage condition and facilitate the handling of a staff member depending on the type of yarn breakage condition. Still another object of the present invention is to provide a self-propelled yarn breakage state detection device for a spinning machine that is not restricted in the running direction of the running unit. To summarize the present invention, a traveling unit and a yarn breakage detection control means are provided, and the traveling unit is provided with a fiber bundle or yarn breakage detecting control means that faces an unprocessed area of the fiber bundle or fibers in the stretching direction of the fiber bundles or fibers of each spindle. A pair of left and right optical detection means are provided with a left and right interval wider than the width of the fiber bundle or fibers, and at least one optical detection means is provided at a position corresponding to the processing area between the back roller and the front roller of the spinning machine. Optical detection means is provided at a position corresponding to the processing area between the front roller of the spinning machine and the winding tube yarn. The yarn breakage state detection control means detects a signal from the gate signal generation means during a period from when one of the left and right optical detection means detects a fiber bundle or fibers until the other one finishes detecting a fiber bundle or fibers. When a gate signal is generated and one of the two optical detection means provided corresponding to the processing area receives an output during the period of the gate signal, the output is stored and retained during the period of the gate signal. The thread breakage state is determined based on the storage state during the gate signal period. EMBODIMENT OF THE INVENTION Below, with reference to drawings, the case of a spinning machine, which is an example of a spinning machine, will be specifically described as an embodiment of the present invention. 1 to 3 are illustrative views showing the relationship between a spinning machine to which the present invention is applied and a traveling unit according to an embodiment of the present invention. In particular, FIG. 1 is a plan view thereof, and FIG. 2 is a traveling unit. The front view of the unit is shown, and FIG. 3 shows its side view. In FIG. 1, a spinning frame 100 includes a plurality of (for example, several hundred) weights on both sides of its longitudinal direction. On both sides of the spinning machine 100, there are traveling units 2.
00 (described in detail with reference to FIGS. 2 and 3 below) is provided so as to be freely movable in the longitudinal direction of the spinning frame 100. One side in the longitudinal direction of the spinning machine 100 (the left side in the figure) is the gear end (GE),
The other side (right side as shown) is the out end (OE). At the outer end of the spinning frame 100, an electrical equipment section 101 of the spinning frame 100, a fixed unit 102 for controlling the traveling state of the traveling unit 200, and a control box 103 are provided. Next, referring to FIGS. 2 and 3, the spinning machine 1
00 and the traveling unit 200 will be explained in detail. As is conventionally known, the spinning machine 100 has a main body 1.
Weights are provided at regular intervals along the longitudinal direction on both sides of the 10. Each weight has a draft mechanism 12 that draws a fiber bundle such as a sliver or roving into a thin thread.
0 and a spindle section for twisting the drawn yarn and winding it as a tube yarn 131. In the main body 110 of this spinning frame 100, struts 111 are erected at regular intervals. A bracket 112 is attached to the upper part of the support column 111 in a direction perpendicular to the longitudinal direction of the spinning frame 100. A hanger 113 is fixed to the tip of the bracket 112. A top rail 114 is attached to the hanger 113 along the longitudinal direction of the spinning frame 100 for guiding the upper part of the traveling unit 200 when it travels. top rail 11
A bottom rail 115 for supporting and running the traveling unit 200 is provided in the longitudinal direction of the spinning frame 100 at the lower position of the spinning frame 100. Further, at the tip of the bracket 112, a trolley duct 116 is installed parallel to the top rail 114. This trolley duct 116 is connected to the traveling unit 2.
While the 00 is running, the current collector (or contactor) 2
06 to supply power to the traveling unit 200. Note that the trolley duct 116 is
It is used as an information transmission path for frequency modulating and PCM modulating the information detected by the traveling unit 200 and transmitting it to the fixed unit 102 as necessary. The travel unit 200 includes a travel drive motor (hereinafter referred to as motor) 211 in a housing 201,
A driving wheel 212 is attached to the shaft of the motor 211 (or a shaft that has been decelerated), and the wheel 2 is attached to the back of the housing 201.
13 is rotatably attached. Then, wheels 212 and 213 are placed on the bottom rail 115. In addition, on the back side of the housing 201 (that is, the surface facing the spinning machine 100),
L-shaped brackets 202 and 203 are fixed in a vertical direction at a constant interval with respect to the running direction.
A roller 204 is pivotally supported on the upper part of the brackets 202 and 203, respectively, so as to sandwich both sides of the top rail 114. One bracket 202 has a trapezoidal bracket 20.
5 protrudes toward the spinning machine 100 and is fixed. This bracket 205 is connected to a plurality of photoelectric sensors 22, which will be described later.
1 to 224 are attached at predetermined positions with respect to the yarn path. Also, bracket 202
or 203, a current collector (or contact) 206 is attached. This current collector 206
contacts the trolley duct 116 and introduces the electric power supplied through the trolley duct 116 as a power source for the traveling unit 200. The bracket 205 includes a photoelectric sensor 221.
224 are provided at appropriate positions. Further, the bracket 202 is provided with a bracket 207. A photoelectric sensor 22 is installed at the tip of the bracket 207.
5 is attached. Further, the brackets 202 and 203 are provided with a push button switch 23 for instructing the traveling unit 200 to stop traveling and for commanding to change the traveling direction.
1,232 are each attached. The pushbutton switches 231 and 232 are provided on both sides of the housing 201 in the running direction, and the button portions are formed relatively large so that they can be easily operated by a worker (or staff member). More preferably, when the operator is performing restoration work based on the broken thread state,
A push button switch 231 on the worker's arm or elbow,
The height is selected so that the button part of 232 will touch. This pushbutton switch 231 issues a stop command when the travel unit 200 is traveling from the out end to the gear end direction (to the left in the figure) by pressing it once, and in the reverse direction (by pressing it a second time). command to run (to the right). When the travel unit 200 is traveling from the gear end to the out end direction (to the right in the figure), the push button switch 232 issues a stop command when pressed the first time, and in the opposite direction (to the left when pressed the second time). direction). In addition, a double pushbutton switch 231,
232 is also used to issue a command to start traveling in the previous traveling direction when a pushbutton switch different from the previously pressed pushbutton switch is pressed after a stop command is issued by the first press. Ru. Furthermore, a fan drive motor (hereinafter referred to as a motor) 241 is built into the housing 201 as required. The shaft of the motor 241 is equipped with a Shirotsuko fan 24.
2 are concatenated. The wind generated when the Shirotsuko fan 242 rotates due to the rotation of the motor 241 is guided by the duct 243 and blown out from the blower nozzle 244.
45 from the blower nozzle 246. By blowing out air, the blower nozzles 244 and 246 prevent wind lines from adhering to the machine base, such as around the roller part, Snell wire, and ring wire.
Works to prevent buildup. FIG. 4A is a plan view showing an example of the arrangement of the photoelectric sensors 221 to 225 in the draft mechanism 120, and FIG. 4B is a side view thereof.
The draft device 120 includes a knot stop 121, a guide 122, a back roller 123, a guide 124, a third roller 125, a guide 126, a second roller 127, and a front roller 128 along the direction from the upper position where the fiber bundle is supplied to the Snell wire 134. are provided sequentially at certain intervals. This knot stop 12
1 serves to prohibit the supply of fiber bundles with knots (knots at the time of raw material exchange or troubleshooting). Photoelectric sensor 221 (first optical detection means) and photoelectric sensor 222 (second optical detection means)
are attached to the bracket 205 at certain intervals so as to face the fiber bundle between the knot stop 121 and the guide 122. The distance between the photoelectric sensors 221 and 222 is
When the optical axis 226 is the center of the filament being drawn from the fiber bundle to the yarn, it is selected to be slightly wider than the width d ₁ of the fiber bundle. Therefore, the photoelectric sensor 221
The width d ₀ corresponding to the period during which either one _of the sensors 222 and 222 detects the fiber bundle is d 0 if the distance from the optical axis 226 to each photoelectric sensor 221, 222 is d ₂ .
=d ₁ +2・d ₂ . A photoelectric sensor 223 (third optical detection means) is fixed to the bracket 205 so as to be on the optical axis 226 and opposite to the filament between the guide 124 and the third roller 125. Photoelectric sensor 224 (fourth optical detection means)
is fixed to the bracket 205 so as to be on the optical axis 226 and opposite to the filament between the guide 126 and the second roller 127. Photoelectric sensor 2
25 (fifth optical detection means) is mounted on the bracket 20 while being supported by the support member 207 so as to be on the optical axis 226 and facing the thread between the front roller 128 and the Snell wire 134.
Fixed to 2. FIG. 5A is a circuit diagram of gate signal generation circuit 300. 5B and 5C are time charts for explaining the operation of gate signal generation circuit 300. FIG. FIG. 6A is a circuit diagram of the thread breakage state determination circuit 400. FIG. 6B is a time chart for explaining the operation of the yarn breakage state determination circuit 400. Next, with reference to FIGS. 1 to 6B, the gate signal generation circuit 300 and yarn breakage state determination circuit 40
0 will be explained in detail, and the operation of this embodiment will be explained. First, the operation of the gate signal generating circuit 300 when the traveling unit 200 is traveling beside the spinning frame 100 and the gate signal generating circuit 300 generates a gate signal based on the fiber bundle of a certain weight will be explained. This gate signal generation circuit 300 is activated by the first optical detection means and is necessary for distinguishing between the detection area where the filament is present and other areas when the traveling unit runs beside the spinning machine. It is a circuit. In FIG. 5A, a signal representing the direction of travel of travel unit 200 is applied to input terminal 301. In FIG. This running direction signal becomes low level when moving from right to left as seen in FIG. 2, and becomes high level when moving from left to right. For this reason,
When traveling unit 200 moves from right to left, a low level signal is applied to input terminal 301, inverted to a high level signal by inverter 311 shown in FIG. 5A, and applied as one input to AND gate 321. At this time, AND gate 322 remains disabled by the low level signal representing the direction of travel. Then, while the travel unit 200 is moving leftward, the photoelectric sensor 221 detects the fiber bundle supplied to the guide 122, derives a negative pulse, and applies it to the input terminal 302. The negative pulse output of this photoelectric sensor 221 is differentiated in the falling direction by a falling differentiation circuit 331 [fifth
B Figure 1]. This differential pulse is the flip-flop 3
41 is set, the flip-flop 34
The set output of 1 becomes high level. Then, when the traveling unit 200 further travels to the left,
Photoelectric sensor 222 detects the fiber bundle and derives a negative pulse, which is applied to input terminal 303 . When the output pulse of the photoelectric sensor 222 rises (that is, when the photoelectric sensor 222 no longer detects the fiber bundle),
The rising differentiation circuit 332 differentiates the rising edge [5th B]
Figure 3]. This differential pulse is applied to the flip-flop 34.
1 (Fig. 5B, 4). For this reason,
The flip-flop 341 is connected to the travel unit 200.
is traveling to the left, the photoelectric sensor 221
A high level signal is derived during the period from when the photoelectric sensor 222 starts detecting the fiber bundle until the photoelectric sensor 222 stops detecting the fiber bundle. This high level signal is AND
It is derived from the output terminal 304 via the gate 321 and the OR gate 351 as a gate signal. On the other hand, when the traveling unit 200 is traveling from left to right, the traveling direction signal becomes high level. Therefore, AND gate 322 is activated and AND gate 321 is deactivated.
In this case, the photoelectric sensor 222 detects the fiber bundle first, and the photoelectric sensor 221 detects the fiber bundle later. At this time, when the photoelectric sensor 222 detects a fiber bundle (that is, when the output of the photoelectric sensor 222 falls), the falling differentiation circuit 333 derives a differential pulse [FIG. 5C], and sets the flip-flop 342. [Figure 5C, 6]. After that, when the photoelectric sensor 221 no longer detects the fiber bundle (that is, when the output of the photoelectric sensor 221 rises to a high level) [FIG. 5C, 7], the rising differentiation circuit 334 derives a differential pulse. Reset the flip-flop 342 (FIG. 5C).
Therefore, the flip-flop 342 operates during the period from when the photoelectric sensor 222 starts detecting the fiber bundle to when the photoelectric sensor 221 stops detecting the fiber bundle.
Derive a high level signal. This high level signal is derived from output terminal 304 as a gate signal via AND gate 322 and OR gate 351. Next, an explanation will be given of the operation when the yarn breakage state determination circuit 400 determines the yarn breakage state of a certain weight during the gate signal period. The gate signal generated by the gate signal generation circuit 300 is input to the input terminal 40.
given to 1. At the rising edge of this gate signal, the rising differentiation circuit 411 differentiates the rising edge, and the differential pulse is used to select the flip-flop 421 [6th B].
1], 422 and 423 [FIG. 6B, 2]. Further, a gate signal is given as one input of AND gates 430 to 432, and each
Activate the AND gate. Further, the gate signal is connected to the inverter 44 included in the reset circuit 440.
given to 1. During the gate signal period, if the stretched filament and thread of the weight to be detected are not cut, the photoelectric sensor 22
3, 224, and 225 all derive detection outputs (high level) at any timing during the gate signal period. Each photoelectric sensor 223-22
The detection output of 5 is the corresponding AND gate 430~
432 to the corresponding flip-flop 421
~423 set input [6th B
Figures 3, 4, 5]. Therefore, each flip-flop 421, 422, 423 outputs the corresponding photoelectric sensor 223, 224, 2 during the gate signal period.
25 stores and stores the state in which the filament or yarn being stretched is detected. Next, when the travel unit moves further and the gate signal falls, the AND circuits 430-432 become inactive and the signals from the photoelectric sensors 223-225 are no longer transmitted to the corresponding flip-flops 421-423. Furthermore, the output of the inverter 441 included in the reset circuit 440 rises at the same time as the gate signal falls (FIG. 6B), and is differentiated by the rise differentiation circuit 442 (FIG. 6B).
Figure 7]. This differential pulse is the flip-flop 42
5 to 426 (FIG. 6B, 8). Here, the output of the inverter 441 is
Since it is given as one input to the AND circuits 433-435, the AND circuits 433-435 become active, and the flip-flops 421, 422, 4
23 set outputs are connected to corresponding AND circuits 4.
33, 434, 435 as set inputs of corresponding flip-flops 424, 425, 426 (FIG. 6B, 9, 10, 11). As explained above, during the gate period,
Each of the flip-flops 421 to 423 takes in the detection information of the corresponding photoelectric sensor 223 to 225, and at the end of the gate period, that is, immediately after the traveling unit passes the detection target weight, the flip-flops 421 to 423 correspond to the information of the flip-flops 421 to 423, respectively. It is transferred to flip-flops 424-426. AND circuit 436 then activates the output by having all set outputs of each flip-flop 424-426 active. That is, during the gate signal period, each of the corresponding photoelectric sensors 223 to
225 detect the presence of a filamentous body, immediately after the end of the gate signal period, the AND circuit 436
A high level output is produced indicating that the filament is being spun normally. Similarly, from the front roller 128 to the tube yarn 131
If the thread leading to the
5 does not derive the detection output during the gate signal period.
Therefore, flip-flops 423 and 426
does not derive a high-level set output even during the gate signal period. Therefore, AND gate 437 derives a thread breakage detection output based on flip-flops 424 and 425 being set and flip-flop 426 being reset. Furthermore, if the filament being stretched is broken between the third roller 125 and the second roller 127, it is considered that the filament is wrapped around the third roller. In this case, photoelectric sensors 224 and 225
does not derive a detection output even during the gate signal period, flip-flops 431 and 423
remains reset. Therefore, after the traveling unit passes the weight, the AND gate 438 is
A roller wrap condition is detected based on flip-flop 424 being set and flip-flops 425 and 426 being reset. Furthermore, in this embodiment, in the case of an empty weight or a faulty weight, no gate signal is derived, so the AND gates 430 to 432 remain inactivated, and the weight is not detected (i.e., it is determined to be an empty weight). Become. That is, in the case of an empty weight or a faulty weight, even if there is an output from the photoelectric sensors 223 to 225, the output is transferred to the flip-flop 42.
1 to 426, photoelectric sensors 223 to 22
Even if any of the items 5 detects fluff or the like, it can be prevented from being erroneously determined as abnormal. To summarize the above description, in this embodiment, the flip-flop 42 at the trailing end of the gate signal
Based on the memory retention state of 4,425,426,
Judgments are made as shown in the table.

[Table] That is, when all the outputs from the photoelectric sensors 223 to 225 are present during the gate signal period, or when there are outputs from the photoelectric sensors 223 and 225, the normal state is determined. Here, photoelectric sensor 2
23 and 225 outputs and photoelectric sensor 2
The reason why it is determined that the thread is normal even when there is no output from the photoelectric sensor 224 is that if there is an output from the photoelectric sensor 225, the yarn is normally wound onto the tube, so it is considered that the photoelectric sensor 224 is malfunctioning. It is. Furthermore, if there is no output from the photoelectric sensor 225 during the gate signal period, it is determined that the yarn is broken. If there is only an output from the photoelectric sensor 423 and no output from the other photoelectric sensors 424 and 425 during the gate signal period, it is determined that the roller is wrapped. If there is no output from all of the photoelectric sensors 423 to 425 during the gate signal period, it is determined whether the nodular portion formed by the knots between the supplied fiber bundle and the fibers has been stopped and cut by a knot stop. . Furthermore, if there is no gate signal, no fiber bundle is supplied, so no determination is made; in other words, it is determined that the fiber bundle is empty. Here, the air spindle discrimination function according to the present invention will be explained. That is, the self-propelled yarn breakage state detection device according to the present invention generates a gate signal by the first optical detection means when traveling beside the spinning machine, and separates the device into a detection area and a non-detection area. I mentioned earlier that. Therefore, when it is necessary to operate the spinning machine with some of the faulty weights still included, if measures are taken to prevent the gate signal from being generated for the faulty weights, the detector according to the present invention will detect the faulty weights. , automatically pass through as a non-detection area. Here, in this embodiment, the measure to prevent the generation of a gate signal means that the photoelectric sensors 221 and 222, which are the first optical detection means,
21 and the guide 122 so that the presence of the fiber bundle is not detected. In other words, by not supplying the raw material fiber bundle to the faulty weight, the faulty weight automatically ceases to be a detection target weight. Therefore, in this embodiment, even in a spinning machine that includes a spindle that is operated as an empty spindle due to a malfunction or the like, false alarms can be prevented by inputting into the detector which spindle is an empty spindle. There's no need to. In this way, the ability for the detector to automatically remove the detection target simply by not supplying raw materials is a very welcome feature for those who operate this type of equipment in the field. As is already clear from the above description, the self-propelled yarn breakage state detection device according to the present invention is capable of arbitrarily setting the width of the area to be detected of the weight to be detected by the first optical detection means. Therefore, it is possible to reliably prevent false detections caused by air fluff that accumulates between the spindles or the structure of the spinning machine, and furthermore, when operating a spinning machine that includes one of the spindles that has failed, it is possible to prevent the failure wall from occurring. It is easy to exclude from the detection target, and since the running direction of the traveling unit can be set arbitrarily, it can be applied not only to patrolling around the spinning machine, but also to 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, by using the first optical detection means and the second optical detection means in combination, it is possible to classify by type which roller part of the trouble-occurring weights the trouble is occurring. Therefore, the treatment method can be selected depending on the type of trouble.
Furthermore, since the present invention performs detection without contacting the filament, the filament is not disturbed. Also, 1 for each weight
Since it is not necessary to install the detectors one after another, the space inside the spinning machine is not occupied, so special effects such as no need for special consideration when adding this device when designing the spinning machine are achieved. By the way, it should be pointed out that the technical idea of the present invention is applicable not only to spinning machines but also to various types of spinning machines such as roving frames and stretching and twisting machines that draw fiber bundles.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the relationship between a spinning machine and a traveling unit to which the present invention is applied.
FIG. 2 is a front view of a traveling unit according to an embodiment of the present invention. FIG. 3 is a side view of a traveling unit and a spinning frame according to an embodiment of the present invention. FIGS. 4A and 4B are diagrams showing the relationship between the draft mechanism 120 and the photoelectric sensors 221 to 225. 5th A
The figure is a circuit diagram of a gate signal generation circuit according to an embodiment of the present invention. FIGS. 5B and 5C are time charts for explaining the operation of the gate signal generation circuit. FIG. 6A is a circuit diagram of a thread breakage state determination circuit according to an embodiment of the present invention. FIG. 6B is a time chart for explaining the operation of the yarn breakage state determination circuit. In the figure, 100 is a spinning machine, 200 is a traveling unit, 120 is a draft mechanism, 131 is a pipe thread,
221 to 225 are photoelectric sensors, 300 is a gate signal generation circuit, and 400 is a yarn breakage state determination circuit.

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. A self-propelled yarn breakage state detection device for a spinning machine, wherein the traveling unit faces a supply area (unprocessed area) of the fiber bundle or fibers of each spindle with respect to the stretching direction of the fiber bundles or fibers, and a pair of left and right optical detection means provided with a left and right interval wider than the width of the fiber bundle or fibers; and at least one optical detection means provided at a position corresponding to a processing area between the back roller and the front roller of the spinning machine. an optical detection means, and an optical detection means provided at a position corresponding to a processing area between the front roller and the winding tube yarn, further comprising a yarn breakage state detection control means, the yarn breakage state The detection control means generates a gate signal at least during a period from when one of the pair of left and right optical detection means detects a fiber bundle or fibers until the other one finishes detecting the fiber bundle or fibers. When an output from either of the gate signal generation means and the two optical detection means provided opposite to the processing area is generated during the gate signal period, the output is stored during the gate signal period. A self-propelled yarn breakage state detection device for a spinning machine, comprising: a memory holding circuit for holding; and a logic circuit for determining a yarn breakage state based on the memory state during the gate signal period.