JP2002105778A - Method for prohibiting piecing for spinning machine and system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for prohibiting a piecing intended to improve operating efficiency through eliminating unnecessary piecing operations for maloprational spindles with frequent yarn breakage occurrence, and also suppress increasing the frequency of the operations for cutting and joining yarns at a yarn joining device in the yarn rewinding operation at a winder in the succeeding process. SOLUTION: This method comprises the following practice: a yarn breakage is detected based on a detection signal from a current sensor 9 for detecting electric current supplied to a spindle motor 2, thus a yarn breakage frequency for each spindle in one doffing cycle is measured; when a cumulative yarn breakage frequency exceeds a preset specified frequency, a display 10b equipped in the housing 3 for the spindle motor 2 for the relevant spindle is lighted, and the startup of the spindle motor 2 for the relevant spindle is prohibited by a startup prohibited means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inhibits splicing of a spinning machine such as a ring spinning machine or a ring twisting machine which is equipped with a large number of weights and independently drives a spindle of each weight by a motor provided for each weight. The present invention relates to a method and a piecing inhibiting device.

[0002]

2. Description of the Related Art In recent years, in order to increase the number of spindles of a spinning frame or to increase the speed of rotation of a spindle, instead of driving all spindles of the spinning frame with a single motor, a spindle is driven for each spindle. A device provided with a motor for use has been proposed. When the single spindle drive motor is provided for each spindle as described above, when a thread break occurs, the motor of the spindle is stopped based on a detection signal from a thread break detection sensor of the spindle. Then, after the piecing operation is performed by the operator or the piecing machine, the motor is restarted.

[0003] Japanese Patent Application Laid-Open No. 6-158559 discloses an apparatus for displaying a thread breakage or an excessively low rotation speed of a spindle in a spinning machine driven by a single spindle. In this device, a detection unit for detecting a rotation speed of a spindle driven by an individual motor is provided. Then, the detection signal of the detection unit is compared with a threshold value by the comparison unit, and when a thread breakage or an excessively low spindle rotation speed occurs, a corresponding display lamp is turned on.

[0004]

Problems to be Solved by the Invention Japanese Patent Application Laid-Open No. 6-15845
In the device disclosed in Japanese Patent Application Laid-Open No. 9-205, an indicator lamp for indicating a thread break is provided for each weight, so that an operator can easily visually recognize the thread break weight and perform a splicing operation.

Conventionally, when there is a thread breakage weight, an operator always performs a splicing operation to restart winding the weight. However, if the piecing is always performed on the thread breakage weight, the piecing is frequently performed on the irregular weight in which the thread breakage occurs frequently. As a result, when a thread break occurs in a weight other than the irregular weight, the waiting time until the splicing work is performed on the weight becomes longer, and the working efficiency of the entire machine base deteriorates.

[0006] In addition, the weight in which thread breakage occurs frequently is as follows.
Although it is preferable in terms of energy to stop the spinning operation without performing the spinning operation, the conventional single-spindle drive type spinning machine is not configured to stop the weight in a spliced state, The rotation of the spindle takes place, wasting energy.

Further, the full bobbin doffed by the ring spinning machine has its yarn wound back by a winder in the next step, and the yarn joining portion is subjected to yarn cutting and joining processing by a yarn joining device provided in the winder. . Therefore, there is also a problem that the number of operations of cutting and joining the yarn by the yarn joining device of the winder increases, and the operating efficiency of the winder decreases for the yarn having many spliced portions.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to eliminate unnecessary waste splicing work for an irregular weight in which thread breakage occurs frequently, to improve work efficiency, and to improve the efficiency of post-processing. It is an object of the present invention to provide a yarn splicing prohibition method and a yarn splicing prohibition device for a spinning machine that can suppress an increase in the number of times of yarn cutting and splicing in a yarn splicing device during a yarn rewinding operation with a winder. is there.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a large number of weights are provided and the spindles of each weight are independently controlled by a motor provided for each weight. In the spinning machine driven by the spindle, the number of times of thread breakage is measured for each weight, and when the number of times of thread breakage within a predetermined time period exceeds a predetermined number of times set in advance, the yarn splicing prohibition informing means provided for the weight is driven. , Prohibit piecing.

According to the present invention, the number of yarn breaks for each weight is measured, and when the number of yarn breaks within a predetermined period exceeds a predetermined number, a yarn splicing prohibition informing means provided on the weight is driven. You. The worker or the piecing device recognizes that the weight is a piecing-prohibited weight by confirming the driving-provision piecing-prohibition notifying means even in the yarn-cutting state,
Do not perform piecing work. As a result, it is possible to eliminate wasteful splicing work of the unbalanced weight and to suppress an increase in the number of times of cutting and joining of the yarn by the winder in a later process.

According to the second aspect of the present invention, in a spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight, the number of times of thread breakage is measured for each weight. When the number of thread breaks within a predetermined period exceeds a predetermined number, a start of the motor of the weight is prohibited.

In this invention, when the number of thread breaks within the predetermined period exceeds a predetermined number, the activation of the motor provided on the weight is prohibited. Therefore, even if an operator attempts to drive the motor by performing the splicing operation, the motor is not driven. Therefore, it is possible to prevent the unnecessary splicing operation of the irregular weight from being repeated.

According to a third aspect of the present invention, in a spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight, the number of times of thread breakage is measured for each weight. When the number of times of thread breakage within a predetermined period exceeds a predetermined number of times set in advance, the activation of the motor of the weight is prohibited, and the yarn splicing prohibition notification means provided on the weight is driven. Therefore, the present invention has both the functions and effects of the first and second aspects of the present invention.

According to a fourth aspect of the present invention, in the second or third aspect of the invention, the starting of the motor of the weight is prohibited based on a command from a control device higher than the weight drive control unit of the weight. Done. According to the present invention, the determination as to whether or not the number of thread breaks of each weight within a predetermined period exceeds a predetermined number of times is performed by a higher-level control device. Since the control is performed by the host controller, the configuration of the control means for controlling the motor of each weight is simplified.

According to a fifth aspect of the present invention, in a spinning machine equipped with a large number of weights and independently driving spindles of each weight by a motor provided for each weight, a thread break provided for each weight is provided. Detecting means, measuring means for measuring the number of thread breaks for each weight, and determining means for determining whether the number of thread breaks within a predetermined period has exceeded a predetermined number of times set in advance,
When the number of times of thread breakage exceeds the predetermined number, a start prohibiting unit for prohibiting the start of the motor of the weight and a yarn splicing prohibition notifying unit provided for each weight are provided.

Therefore, according to the present invention, the thread breakage of each weight is detected by the thread breakage detecting means provided for each weight, and the number of times of thread breakage of each weight is measured by the measuring means. The determination means determines whether or not the number of times of thread breakage within a predetermined period exceeds a predetermined number of times set in advance, and when it exceeds, the yarn splicing prohibition notifying means provided on the weight is driven, and The start of the motor is prohibited by the start prohibiting means. As a result, an effect similar to that of the third aspect is obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a single spindle driven ring spinning machine will be described below with reference to FIGS.

As shown in FIG. 1A, each spindle 1 of the spinning machine is provided with a spindle driving motor (hereinafter referred to as a spindle motor) 2. As the spindle motor 2, a synchronous motor is used. Each spindle motor 2 includes a spindle control device 4 (shown in FIGS. 1B and 2) in a housing 3. A direct current obtained by converting a commercial power supply by an AC / DC converter (both not shown) is supplied to the spindle control device 4.

As shown in FIG. 1B, the spindle control device 4 includes an inverter 5 and a control unit 6 as a weight drive control unit. The control unit 6 includes a CPU 7 and a memory 8. An arbitrary one of the three power supply lines connecting the inverter 5 and the spindle motor 2 is provided with a current sensor 9 which constitutes a yarn breakage detecting means for measuring a current supplied to each spindle motor 2. The CPU 7 inputs the output of the current sensor 9 via an A / D converter and an interface (neither is shown). The CPU 7 stops supplying power to the spindle motor 2 of the spindle when the thread breaks. The CPU 7 confirms (detects) a thread break by a signal from a machine control device described later.

The housing 3 has a display section 1 for displaying a thread breakage.
0a and a display unit 10b as piecing prohibition notification means. As shown in FIG. 1A, both display units 1
0 a and 10 b are provided side by side on the front surface of the housing 3. An orange LED (light emitting diode) is used for the display unit 10a, and a red LED is used for the display unit 10b. The housing 3 is provided with a switch 11 for instructing start and stop of the spindle motor 2.

The total weight of the spinning frame is divided into a plurality of groups, and as shown in FIG.
(48 weights) as one group, each of which is connected to the section control unit 12 via the communication line 13. Each section control unit 12 is connected via a communication line 13 to a machine control device 14 that controls the entire weight. The communication line 13 employs a multi-drop connection using a serial interface. Cereal·
For example, RS-485 is used as an interface. Each section control unit 12 includes a group of control units 6 connected to the section control unit 12,
The transmission and reception of signals with the machine control device 14 are relayed. The output of the current sensor 9 provided for each weight is controlled by the machine controller 14.
Is input to each control unit 6 at a predetermined time on the basis of the command from the CPU, and the measurement data is transmitted to the machine control device 14 as digital current value data via each section control unit 12.

The machine control device 14 includes a CPU 15 and a ROM 1
6, a RAM 17, an input device 18, and an input / output interface 19. The CPU 15 is connected to a winding amount detecting means 20 via an input / output interface 19. A counter for integrating the number of rotations of a front roller (not shown) is used as the winding amount detecting means 20, and the CPU 15 calculates the winding amount at that time from the count value. The CPU 15 constitutes a thread breakage detecting unit, and a measuring unit for measuring the number of times of thread breakage for each weight, and determines whether or not the number of times of thread breakage (integrated value) within a predetermined period exceeds a predetermined number of times Nα. The determining means for determining and the number of thread breaks (integrated value) is a predetermined number N
When it exceeds α, it functions as start prohibition means for prohibiting start of the motor of the weight. The predetermined number Nα varies depending on the spinning conditions, but is set to, for example, several times.

The ROM 16 stores program data and various data necessary for its execution. The program data includes various fiber raw materials, spun yarn counts, number of twists, and other spinning conditions, as well as data on the correspondence between the spindle rotation speed during steady operation, the rotation speed of the draft drive system and the lifting drive system motor, and various other data. There is a map or the like showing the relationship between the number of rotations and the amount of supply current at the winding amount of. This map differs depending on the spinning conditions, and is obtained by performing a spinning test in advance or theoretically. The RAM 17 temporarily stores data input by the input device 18, results of arithmetic processing by the CPU 15, and the like.

The CPU 15 inputs the measurement data of the current sensor 9 of each weight via each control section 6 and each section control unit 12, and uses the same method as the yarn breakage detecting device disclosed in Japanese Patent Application Laid-Open No. 11-181636. Thus, the presence or absence of thread breakage of each weight is determined at predetermined time intervals. Then, the CPU 15 outputs a thread break notification signal via the section control unit 12 to the weight determined to be broken.

The CPU 15 measures the number of thread breaks of each weight from the start of the operation of the machine to the stop of doffing (doff) for each weight. The RAM 17 is provided with a storage area for storing the number of thread breaks corresponding to each weight. The CPU 15 accumulates and stores the number of thread breaks in the corresponding area for the weight in which the thread break occurs, and stores the integrated value for each doff. Reset to zero.

When the number of thread breaks within a predetermined period (in this embodiment, one doff) exceeds a predetermined number Nα, a start prohibition command signal for prohibiting the start of the spindle motor 2 of the spindle is provided. To the control unit 6 of the weight,
Output through the section control unit 12. When the control unit 6 receives the start prohibition command signal, the control unit 6 displays the display unit 1 of the weight.
0b is turned on, and the spindle motor 2 is not started even if a start signal is input from the switch 11. The control unit 6 does not start until a piecing prohibition canceling command signal is input from the CPU 15.

Each machine control device 14 communicates with the host computer 2 via a local area network (LAN) 21.
2 is connected. The host computer 22 is a CPU
23, a ROM 24, and a RAM 25. An input / output interface (not shown) for the host computer 22
The input device 26 and the color display 27 are connected via the. The host computer 22 receives thread break information and the like of each spindle from each machine control device 14. The thread breakage information includes the total number of times of thread breakage for each spindle and information on whether or not the yarn splicing is prohibited. Host computer 22
By operating the input device 26, the weight in the piecing-prohibited state can be displayed on the color display 27. Further, the host computer 22 can output a piecing prohibition canceling command signal to the machine control device 14 by operating the input device 26. The CPU 15 of the machine controller 14 outputs a piecing prohibition canceling command signal to the controller 6 of the corresponding weight based on the prohibition canceling command signal.

Next, the operation of the device configured as described above will be described. Prior to the operation of the spinning machine, spinning conditions such as a fiber material, a spun yarn count, and a number of twists are input to the machine controller 14 by the input device 18. When the operation of the spinning machine is started, the control unit 6 of each spindle controls the spindle motor 2 via the inverter 5 at a predetermined rotational speed in accordance with the spinning conditions based on a command from the machine control device 14. Is controlled so that

The CPU 15 of the machine control device 14 inputs the measured current value data of the current sensor 9 of each weight via the control section 6 and the section control unit 12 at predetermined time intervals, and based on the value, inputs the data of each weight. Judge whether there is a thread break. Then, a thread breakage signal is output to the weight determined to be a thread breakage, and 1 is added to the count value in the thread breakage frequency accumulation area.
The CPU 15 compares the total number N of thread breaks of each weight with a predetermined number Nα, and when the total number N of thread breaks exceeds a predetermined number Nα,
The weight is determined to be an irregular weight, and a start prohibition command is output to the weight.

When each of the control units 6 receives the thread break signal, the control unit 6 turns on the display unit 10a and controls the spindle motor 2
To stop. Further, when each control unit 6 inputs a start prohibition command, even if a start command is input from the switch 11, the drive control of the spindle motor 2 is not performed, and the spindle motor 2 is kept stopped.

The operator performs the piecing operation on the thread breakage weight. Even if the thread is a thread breakage weight, the weight whose display portion 10b is lit is determined to be a piecing-prohibited weight, and the piecing operation is not performed. . An operator mistakenly performs the piecing operation on the piecing prohibited weight,
Even if the switch 11 is pressed to restart the weight, the control unit 6
Does not start the spindle motor 2, so that the irregular weight does not start winding. Further, the operator also notices that the weight is a thread break prohibition weight.

When the maintenance worker completes the repair processing of the irregular weight, the fact is reported to the administrator, and the administrator operates the input device 26 of the host computer 22 to send a start prohibition cancel command signal to the weight. Output via the table controller 14. Then, the drive of the spindle motor 2 can be controlled again for the irregular weight after the restoration processing is completed. When the administrator performs the start prohibition release (yarn splicing prohibition release), the weight in the start prohibition state is displayed on the screen of the color display 27. As shown in FIG. 3, the screen 28 displays the machine number and the weight number side by side. Then, the administrator selects the weight to be released from the start prohibition, and clicks the display of the weight on the screen 28, and outputs a start prohibition release command to the machine control device 14 to which the weight belongs. Then, the display of the weight on the screen 28 is released. When receiving the start prohibition cancel command, the machine control device 14 outputs the start prohibition cancel command to the weight. Upon input of the start prohibition release command, the control unit 6 of the weight stops displaying on the display unit 10b and drives the spindle motor 2 in response to the start command from the switch 11 or the like.

When the spinning is continued and the vessel is full, the operation of the machine is stopped. Then, a doffing operation by a doffing device (not shown) is started. By the start signal of the doffing operation, the integrated value of the number of thread breaks of each weight stored in the RAM 17 is reset to zero. In addition, also when the start prohibition release command signal is output to the non-adjustable weight that has been repaired, the accumulated number of thread breaks of the weight is reset to zero based on the command signal.

This embodiment has the following effects. (1) The number of thread breaks for each weight is measured, and when the total number N of thread breaks within a predetermined period exceeds a predetermined number Nα set in advance, a yarn splicing prohibition notification means (display unit 10b) provided for the weight. ) Is driven (lit). Therefore, the worker recognizes that the weight is a piecing-inhibited weight and does not perform the piecing operation even when the thread is broken. As a result, it is possible to eliminate wasteful splicing work of the unbalanced weight, improve the work efficiency, and cut and join the yarn with the yarn joining device when winding the yarn with the winder in a later process. An increase in the number of times can be suppressed.

(2) When the total number N of thread breaks within the predetermined period exceeds the predetermined number Nα, the activation of the spindle motor 2 of the corresponding weight is prohibited, and the operator performs the piecing operation on the irregular weight. When the motor is driven, the motor does not drive. Therefore, even if the worker performs the piecing operation on the non-adjustable weight without noticing that it is the piecing prohibited weight, it is possible to prevent the unnecessary piecing operation of the non-adjustable weight from being repeated.

(3) When the total number N of thread breaks within a predetermined period exceeds a predetermined number Nα, a command to prohibit the spindle motor 2 of the spindle from being activated is issued by a control device (machine control) higher than the controller 6 of the spindle. Device 14). Therefore, the configuration of the control unit 6 that controls the motor of each weight is simplified.

(4) The machine control device 14 is connected to the host computer 22 via the LAN 21, and the start prohibition command can be released by a command from the host computer 22. Therefore, the worker cancels the start prohibition for each spindle without permission, and the host computer 22
There is no danger of trouble in the management.

(5) Since the non-adjustable weight is held in a stopped state, unnecessary energy consumption due to the rotation of the improper weight can be prevented. The embodiment is not limited to the above, and may be embodied as follows, for example.

A reset switch may be provided in the housing 3 of the spindle motor 2 so that the maintenance worker can notify the host computer 22 that the repair of the improper weight has been completed. The reset switch 29 is preferably provided at a position where it is difficult for a general operator (an operator performing a piecing operation) to operate, for example, at a rear side of the housing 3 as shown in FIG. In this case, it is possible to prevent a general worker from erroneously operating the reset switch 29 and to prevent the start prohibition command from being output to the non-adjustable weight that should not cancel the start prohibition command.

The control unit 6 provided for each weight detects the thread breakage of each weight, measures the number of thread breaks, and determines that the total number N of thread breaks within a predetermined period exceeds a predetermined number Nα. A determination may be made as to whether or not the driving (turning on) of the yarn joining prohibition informing means (display unit 10b) and the start of the spindle motor 2 are prohibited based on the determination. In this case, the start and end of one doff is determined by the machine control device 14.
Alternatively, the start command signal and the completion signal of the doffing apparatus may be directly output to each control unit 6.

The machine control device 14 may be connected to the host computer 22 so that the machine control device 14 can output a start prohibition release command to each control unit 6. Further, even when connected to the host computer 22, the start prohibition release command may be output from the machine control device 14 to each control unit 6.

When the total number N of thread breaks within a predetermined period exceeds a predetermined number Nα, the yarn splicing prohibition notifying means is only driven and the spindle motor start prohibition measure is not performed. Good. Even in this case, in the thread break state, the operator recognizes that the weight is a piecing prohibited weight and does not perform the piecing operation.

The provision of the yarn splicing prohibition notifying means is omitted, and only when the cumulative number N of yarn breaks within a predetermined period exceeds a predetermined predetermined number Nα, only the motor start prohibition measure of the weight is performed. It may be. In this case, the operator performs the piecing operation, but the spindle motor 2 is not started even if the switch 11 is operated, so that it is determined that the weight is a fault. Since the piecing is completed, the piecing operation is not repeated.

The detection of the thread breakage of each spindle is not limited to the method in which the current supplied to the spindle motor 2 is detected by the current sensor 9, but another type of thread breakage detection sensor may be used. Instead of providing the display unit 10b as the yarn splicing prohibition notification unit separately from the display unit 10a for yarn breakage notification, one display unit is used to change the display mode, such as continuous lighting and blinking. May be notified of the thread break and the piecing prohibition. In this case, the number of parts is reduced and the manufacturing cost can be reduced.

In the vicinity of the display units 10a and 10b, characters indicating the display contents, for example, "thread break" and "prohibition of splicing" may be marked. In this case, it is easy for the operator to determine the difference between the yarn breakage and the yarn splicing prohibition.

The integration period of the number of times of thread breakage for judging whether or not the weight is a non-adjustable weight may be set not in units of one doff but in units of working hours or days of a shift worker. ○ Instead of providing the inverter 5 for each weight, a configuration in which the spindle motors 2 of all weights are driven and controlled via one inverter, or the spindle motors 2 are divided into a plurality of groups and one inverter is provided for each group A configuration may be provided. In this case, the number of inverters is reduced, and the manufacturing cost is reduced.

The present invention is not limited to the ring spinning machine, but may be applied to a single-spindle drive type ring twisting machine or the like. The technical ideas (inventions) other than those described in the claims that can be grasped from the above embodiments are described below.

(1) In the invention according to claim 5,
A spindle drive for driving and controlling the motor is provided for each spindle, a higher-level control device for controlling each spindle drive is provided on the machine base, and the measuring means and the judgment means are provided in the higher-level control device. Then, the controller outputs a piecing prohibition command and a start prohibition command to each of the spindle driving devices.

(2) In the invention described in claim 1 or 3, the piecing prohibition notification command is output from a machine control device provided in each of the spinning machines. (3) In the invention described in claim 2 or claim 3,
The machine start prohibition command is output from a machine controller provided in each spinning machine stand.

(4) In the invention according to any one of the first to fourth aspects, the cancellation command of each prohibition command is output from a host computer managing a plurality of spinning machines.

[0051]

As described in detail above, according to the first to fifth aspects of the present invention, it is possible to eliminate unnecessary waste splicing work for an irregular weight in which yarn breakage occurs frequently, and to improve work efficiency. Further, it is possible to suppress an increase in the number of times of the yarn cutting and joining operations performed by the yarn joining device during the yarn rewinding operation by the winder in the subsequent process.

[Brief description of the drawings]

FIG. 1A is a schematic front view showing a weight according to an embodiment, and FIG. 1B is a block diagram of a spindle control device.

FIG. 2 is a block circuit diagram showing an electrical configuration.

FIG. 3 is a schematic view of a screen showing a start prohibition weight.

FIG. 4 is a schematic side view of a spindle control device according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spindle, 2 ... Spindle motor, 9 ... Current sensor as thread breakage detecting means, 10b ... Display part as splicing prohibition informing means, 14 ... Machine control device as upper control device, 15 ... Measurement means, CPU 15 as a judging unit and a start prohibiting unit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kimoto Minoshima 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Tsunetori Iwashita 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. F term in Toyota Industries Corporation (reference) 4L056 AA02 AA32 DA33 EB18 EB30 EC02 EC55 ED11

Claims (5)

[Claims] 1. A spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight. A splicing prohibition method for a spinning machine that prohibits splicing by driving a splicing prohibition notifying means provided on the weight when the number of cuts exceeds a predetermined number. 2. A spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight. A yarn splicing prohibition method for a spinning machine that prohibits activation of a motor of the weight when the number of breaks exceeds a predetermined number. 3. A spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight. When the number of cuts exceeds a predetermined number of times, a method for inhibiting splicing of a spinning machine that prohibits activation of a motor of the weight and drives a splicing inhibition notification unit provided on the weight. 4. The method according to claim 2, wherein the starting of the motor of the weight is prohibited based on a command from a control device higher than the weight driving control unit of the weight. 5. A spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight, wherein a yarn breakage detecting means provided for each weight, Measuring means for measuring the number of times of thread breakage, determining means for determining whether or not the number of times of thread breakage within a predetermined period exceeds a predetermined number of times, when the number of times of thread breakage exceeds the predetermined number of times, A yarn splicing prohibition device for a spinning machine, comprising: start prohibition means for prohibiting the motor of the weight from being started; and splicing prohibition notifying means provided for each weight.