JPH0375471B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for braking a spindle type winder. (Prior Art) Conventionally, as a method for braking a winding machine, a method has been adopted in which, for example, a brake drum is attached coaxially with a bobbin holder or a motor, and this drum is pressed against the winder by a shoe to perform braking. However, in recent years, as winding machines have become larger and faster, the above method has resulted in problems such as abnormal noise between the shoe and the drum during braking, severe wear of the shoe, shortened lifespan, and red heat of the shoe. It had drawbacks such as being dangerous. In order to solve this problem, a method has been developed in which the inverter that drives the motor is decelerated at a constant deceleration gradient to apply so-called regenerative braking. (Problem to be solved by the invention) However, in the case of such a method, conventionally the speed was uniformly decelerated at the same slope regardless of the winding diameter of the full or empty bobbin. As shown in the relationship between and braking time, for example, when the bobbin is full, the braking time is about 1 minute, but when the bobbin is empty, the braking time is much longer than this, about 4 minutes, and the following problems occur. was. In the figure, A to B' are cases where the yarn speed and winding diameter are as shown in Table 1 below.

[Table] () With the manual winder, it took a long time to brake when handling the winder, and a lot of waste thread was generated. () In automatic winding machines, after turret (switching from a full bobbin to an empty bobbin), the distance between the bobbin holders is increased to prevent the yarn wound on one bobbin from interfering with the full package. This had the disadvantage that the frame of the main body became large. Further, when the rotation speed of the bobbin holder is high and the winding diameter is large, it takes a long time to stop the bobbin holder, which is dangerous because large vibrations occur when passing the resonance point of the bobbin holder. (Purpose of the Invention) Therefore, the present invention provides a method for a manual winder by changing the deceleration gradient as a function of the rotational speed of the bobbin holder or the winding diameter, thereby making the braking time substantially constant regardless of empty winding or complete winding. The purpose is to reduce the generation of waste yarn, downsize the machine frame for automatic winding machines, and avoid danger. (Means for Solving the Problems) In order to achieve the above object, the method for braking a winding machine according to the present invention includes a method for braking a winding machine in which a bobbin holder is driven by an electric motor via an inverter. When gradually decelerating at a predetermined gradient, the deceleration gradient is changed at least as a function of the rotational speed of the bobbin holder or the winding diameter. (Function) In the present invention, the deceleration gradient of the holder drive motor by the inverter is changed by a function related to the bobbin holder rotation speed or the winding diameter before braking. Therefore,
Braking time is almost constant regardless of empty winding or full winding,
The generation and danger of waste yarn can be avoided, and the machine frame can be made smaller. (Example) Hereinafter, the present invention will be explained based on the drawings. 1 and 2 are diagrams showing an embodiment of a winding machine to which the present invention is applied. First, the configuration will be explained. In Figure 1, 1
is an induction type AC motor, and the AC motor 1 drives the bobbin 3 using power supplied from an inverter 2. Note that, for convenience of explanation, the bobbin 3 is expressed as a concept that includes a bobbin and a bobbin holder. Yarn is wound around the bobbin 3 to form a so-called package 4, and a contact roller 5 contacts and rotates in conjunction with the package 4. A gear 6 is connected to the contact roller 5, and the rotation speed of the gear 6 is detected by a detector 7 as the contact roller rotation speed. The output of the detector 7 is input to a control unit 8, which includes a winding speed setting device 9, a winding diameter calculator 10, a comparator circuit 11, and a deceleration gradient calculator 1.
2. It is composed of a PID calculator 13, an acceleration gradient calculator 14, a changeover switch 15, and a frequency command unit 16. The winding speed setter 9 sets a target value of the contact roller rotation speed optimal for winding the yarn, and outputs this to the comparison circuit 11 and the winding diameter calculator 10. The comparison circuit 11 is further inputted with a detection signal from the detector 7 (the current rotation speed of the contact roller), and the comparison circuit 11 compares this with the above-mentioned target value to find the deviation between the two and sends it to the PID calculator. Output to 13.
Based on this deviation, the PID calculator 13 calculates the PID so that the rotation speed of the contact roller matches the target value.
Perform calculations (proportional, integral, differential calculations). On the other hand, the winding diameter calculator 10 and the deceleration gradient calculator 1
The frequency detection value of the inverter 2 is input to 2, and the winding diameter calculator 10 calculates the diameter of the package 4 being wound up and outputs it to the deceleration gradient calculator 12. The deceleration gradient calculator 12 calculates the optimum deceleration gradient of the bobbin 3 from the calculated winding diameter and the frequency of the inverter 2. Further, the acceleration gradient calculator 14 sets the acceleration gradient when the motor 1 is started and the rotational speed of the bobbin 3 increases. Here, the optimum deceleration gradient is determined based on the following conditions, for example. When the deceleration time t is calculated from the electric power P during deceleration, GD ² (rotational energy) of the rotating body, and the rotational speed N, it is expressed as shown in the following equation. t=k ₁・GD ²・N ² /P... However, K ₁ : Constant In this case, GD ² is the package diameter when D is
Since it is proportional to D ⁴ and P is determined by the capacitance of a resistor incorporated in the inverter 2, which will be described later, the equation can be modified as shown below. t=k ₂・D ⁴・N ² ... However, K ₂ : Constant Therefore, the deceleration gradient a is given by the output frequency of inverter 2 as f (however, f=k ₃・N, k ₃ : constant) , is expressed by the following equation. a=K・1/D ⁴・N ² ... However, k: constant The outputs of the deceleration gradient calculator 12, PID calculator 13, and acceleration gradient calculator 14 are connected to terminals a, b, and c of the changeover switch 15, respectively. The changeover switch 15 switches each of these outputs according to the control mode, and this switching is performed for starting, winding,
This is done automatically based on the signal from the doff operation. In addition, in an automatic winder, switching is automatically performed in conjunction with the turret operation at the time of yarn switching. The switching output of the switching switch 15 is inputted to the frequency command device 16 via the terminal d, and the frequency command device 16 commands the frequency of the inverter 2 according to this switching output. Inverter 2 generates AC power at a frequency corresponding to the command frequency to drive motor 1.
At the same time, when braking the motor 1, the motor 1 is braked by consuming regenerative power by a resistor built inside (in the DC circuit section of the inverter). A brake drum 17 is connected to the motor 1, and rotation of the brake drum 17 is stopped by pressure contact with a brake shoe 18. The above pressure contact of the brake shoe 18 is performed by a cylinder 19, and the cylinder 19 is connected to the frequency command unit 16.
When the frequency command output from the inverter 2 to the inverter 2 becomes zero, this pressure welding process is performed in response to a command from an operation circuit not shown. Next, the action will be explained. At startup Connect contacts a and b of the changeover switch 15 to start the motor 1. As a result, the rotational speed of the bobbin 3 increases with the acceleration gradient set by the deceleration gradient calculator 12. When winding the yarn, connect contacts b and d of the changeover switch 15. Therefore, a calculated value for PID control is calculated so that the number of rotations of the contact roller 5 becomes the target value, and the output frequency of the inverter 2 is controlled by this calculated value to control the rotation of the motor 1. This method is called circumferential speed control using the contact roller 5, and is intended to maintain the circumferential speed of the package 4 at an optimum value during winding. During braking, connect contacts c and d of selector switch 15. Therefore, the diameter of the package 4 is calculated by the winding diameter calculator 10 based on the frequency of the inverter 2 immediately before braking and the target value set by the winding speed setting device 9. Then, a deceleration gradient during braking is calculated by the deceleration gradient calculator 12 from the calculated winding diameter and the frequency of the inverter 2, and a frequency command to the inverter 2 is issued based on this deceleration gradient. As a result, the motor 1 is sequentially decelerated at a speed corresponding to this frequency command, and regenerative power is consumed by the resistance within the inverter 2 during this deceleration process. When the command value to the inverter 2 becomes zero, the brake shoe 18 is pressed against the brake drum 17 by the cylinder 19, and the motor 1 is completely stopped. Here, the reason why the brake is applied mechanically is that since an induction motor is used as the motor 1, it is considered that if the power supply shifts to a low frequency range, it will be difficult to apply the brake. Further, in the event of an abnormality in the inverter 2 or in the event of a power outage in the power supply system for driving this device (for example, a power outage in the commercial power supply), the inverter 2 will no longer be able to perform braking, so a mechanical brake is used. The resistor built into the inverter 2 is set to have a capacitance such that the braking energy is maximum at the maximum speed of the winding machine and braking can be performed in a predetermined time at the maximum winding diameter. The braking gradient is determined for the braking time at a predetermined speed and winding diameter so that the capacity of the resistor can be transferred to the maximum extent. Therefore, in this embodiment, as shown in FIG. 2, the braking time can be made substantially constant compared to the conventional case, regardless of whether the winding is empty or completely winding. Therefore, for example, when the rotation speed of the bobbin 3 is high and the winding diameter is small (when the inertia is small), there is a sudden deceleration gradient, and when the rotation speed is low and the winding diameter is large (when the inertia is large).
The vehicle is braked at a gentle deceleration gradient. Therefore, the conventional problems () and () are solved as follows. That is, in the manual winder, the braking time during threading can be shortened, and the generation of waste thread can be reduced. Further, in an automatic winding machine, it is possible to reduce the distance between two bobbins, and the machine frame can be made smaller. Furthermore, since the time until it stops is short, it instantly passes through the resonance point of the bobbin holder, so large vibrations do not occur and danger can be avoided. Note that the present invention is not limited to the determination of the deceleration gradient as in the above embodiment. For example, the capacity of the regenerative resistor is set so that braking can be done for a predetermined time T at the maximum winding diameter at the maximum speed, and the braking time T _B at the predetermined speed is set.
may be set to a value expressed by the following formula. T _B =predetermined speed/maximum speed×T... By doing this, as shown in FIG. 4, braking can be performed in the same time at a predetermined speed regardless of the winding diameter. This method has the advantage of preventing the ball and race of the bearing from slipping when the bobbin suddenly stops. Furthermore, as another aspect of the present invention, for example, the braking time may be programmed in advance so that braking is performed at a braking time corresponding to a predetermined winding speed. Note that the method of the present invention is not limited to application to wire logic circuits as shown in the above embodiments. For example, it is of course possible to implement it using specific software using a microcomputer. (Effects) According to the present invention, since the deceleration gradient is changed by a function related to the rotation speed of the bobbin holder or the winding diameter,
The braking time can be kept almost constant regardless of empty winding or complete winding, reducing the generation of waste yarn in the case of manual winders, and reducing the size of the machine frame and reducing the risk of danger in the case of automatic winders. You can try to avoid it.

[Brief explanation of drawings]

1 and 2 are diagrams showing an embodiment of a winding machine to which the winding machine braking method according to the present invention is applied;
Fig. 2 is a diagram showing the relationship between the bobbin holder rotation speed and braking time, and Fig. 3 is a diagram showing the relationship between the bobbin holder rotation speed and braking time according to another aspect of the braking method of the winder according to the present invention. A diagram showing the relationship between
FIG. 4 is a diagram showing the relationship between bobbin holder rotation speed and braking time in a conventional braking method for a winder. 1...Motor, 2...Inverter, 3...Bobbin, 8...Control unit.

Claims (1)

[Claims] 1. When braking a winding machine that drives a bobbin holder with an electric motor via an inverter, when the inverter is gradually decelerated at a predetermined gradient, the deceleration gradient is at least a function of the rotation speed or winding diameter of the bobbin holder. A method for braking a winding machine, characterized in that the braking method is changed.