JPS6138100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a yarn winding method using a so-called surface friction drive device in which a yarn supplied at a substantially constant speed is formed into a package on a winding tube that rotates while being pressed against a winding drum. It is related to.

When winding yarn with a conventional surface friction drive type winding device, so-called ribbon winding usually occurs when the ratio of the number of revolutions of the package to the number of traverses is at or near an integer ratio. In this area, the traverse speed is varied from the normal traverse speed to avoid overlapping yarns and prevent ribbon winding.

However, since varying the traverse speed involves variations in the winding tension of the yarn, if the range of variation in the traverse speed is wide, the tension of the yarn will fluctuate greatly and the uniformity of the yarn will be lost. Moreover, this is undesirable since it may cause the twill to come off, the yarn to break, or the package to collapse. Therefore, in order to limit the variation in yarn tension to a certain constant range, it is necessary to reduce the range of variation in the traverse speed.

However, if the fluctuation width of the traverse speed is made small, the threads of the package will overlap more and ribbon winding cannot be completely prevented. SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned drawbacks, and its purpose is to provide a winding device using a surface friction drive system. It is an object of the present invention to provide a winding method that completely prevents ribbon winding while minimizing fluctuations in the winding tension of the strip. The winding speed is made to fluctuate with a constant amplitude and a constant period, and in synchronization with the fluctuation of this traverse speed, the winding speed is fluctuated with a constant amplitude and period based on a constant average winding speed, and the fluctuation of the winding speed changes the traverse speed. The present invention is characterized in that the winding speed is decreased when the speed is increased, and the winding speed is increased when the traverse speed is decreased.

An example of a device for carrying out the method of the present invention will be described below with reference to the drawings. In FIG. Connect to each. The ratio setting amplifier 2 receives an input signal from the speed setting reference voltage generator 1 and controls a base speed command to a speed control device that controls the speed of traverse. and connected to the summing amplifier 6. On the other hand, the ratio setting amplifier 3 receives the input signal from the speed setting reference voltage generator 1 and controls a base speed command to a speed control device that controls the winding speed. 5 and summing amplifier 8. Reference numeral 9 denotes a ribbon winding prevention wave generating device for generating the ramp waveform shown in FIG.

The amplitude adjusting device 4 receives the input signal from the ribbon winding prevention wave generating device 9 and adjusts the amplitude to be proportional to the magnitude of the base speed command from the ratio setting amplifier 2, and adjusts the amplitude to the amplitude proportional to the magnitude of the base speed command from the ratio setting amplifier 2. It is connected to a frequency converter 10 and a traverse drive synchronous motor 12 via an amplifier 6.

On the other hand, the amplitude adjusting device 5 receives the input signal from the ribbon winding prevention wave generating device 9 and adjusts the amplitude to be proportional to the magnitude of the base speed command from the ratio setting amplifier 3. Connect to inverting amplifier 7. The inverting amplifier 7 inverts the waveform of the amplitude adjusting device 5 to reduce or increase the winding speed in response to the increase or deceleration of the traverse speed. It is connected via the summing amplifier 8 to a frequency converter 11 and a synchronous motor 13 for driving the winding drum. Sho 1
4 is a traverse mechanism, 15 is a winding drum, 16
is package. An example of a device for carrying out the present invention is configured as described above. Next, its operation will be explained. In FIG. 1, the components controlling the traverse speed are: speed setting reference voltage generator 1 - ratio Setting amplifier 2 - amplitude adjustment device 4 -
Summing amplifier 6 - frequency converter 10 - synchronous motor 1
It is 2. On the other hand, the components controlling the winding speed are the speed setting reference voltage 1, the ratio setting amplifier 3, the amplitude adjusting device 5, the inverting amplifier 7, the summing amplifier 8, the frequency converter 11, and the synchronous motor 13.

Now, reference voltages for determining the base speed are input from the speed setting reference voltage generator 1 to the ratio setting amplifiers 2 and 3, respectively. Here, the base speed command outputted to the traverse system by the ratio setting amplifier 2 is a constant reference voltage shown by the dotted line a in Fig. 3 (E), while the ratio setting amplifier 3 outputs it to the winding drum system. Dotted line b in Figure 3 shows the base speed command
is a constant reference voltage shown in .

From the beginning of the winding of the yarn, a voltage having the waveform shown in FIG. 3A is sent from the ribbon winding prevention wave generator 9 to the point where the reference voltage that determines the base speed is output, which determines the traverse speed and winding speed. input to each circuit.

First, the amplitude adjustment device 4 receives both the base speed command voltage and the voltage from the ribbon winding prevention wave generator 9,
The amplitude of the waveform shown in FIG. In the summing amplifier 6, the base speed command voltage and the signal from the amplitude adjustment device 4 are added, resulting in a speed command voltage having the waveform shown in FIG.
to operate the traverse device 14 to control the traverse speed. At this time, the speed of the traverse mechanism 14 is proportional to the voltage waveform output from the summing amplifier 6 (Fig. 3 E), and as shown in Fig. 2 A, the speed gradually increases from the beginning of winding and reaches the highest point. reached, then decelerated and exceeded the base speed,
After reaching the lowest point at point, it rises again, and the period T
Then, the speed is increased and decelerated repeatedly at a constant average speed. On the other hand, the amplitude of the winding speed is adjusted by the amplitude adjustment device 5 which receives the base speed command voltage and the output signal from the ribbon winding prevention wave generator 9.
A voltage having the waveform shown in the figure (b) is output. The inverting amplifier 7 inputting this output voltage converts it into a voltage having a waveform completely inverted from the waveform shown in FIG. 3B, as shown in FIG. 3C, and outputs it to the summing amplifier 8. In this summing amplifier 8, the output voltage from the inverting amplifier 7 and the base speed command voltage from the ratio amplifier 3 are added, resulting in a speed command voltage having a waveform shown in FIG. The rotation of the winding drum 15 is controlled via the synchronous motor 13.

This change pattern in winding speed is shown in FIG. 2B.

Here, when comparing the traverse speed and winding speed, the traverse speed command voltage shown in Fig. 3
The speed changes in the patterns shown in FIGS. 2A and 2B in proportion to the change in the waveform of the winding speed command voltage shown in FIG. That is, when the winding speed increases, the traverse speed decreases, whereas when the winding speed decreases, the traverse speed increases.

(Example) 75d/32f polyester processed yarn, length 290mm,
Using a surface friction drive type winding device on a winding tube with a diameter of 75 mm, the winding speed was varied within ±1.5% of the winding speed at a cycle of 20 seconds at an average winding speed of 600 m/min. average traverse speed
160 m/min, the traverse speed fluctuation range is ±12% at the same period as the above-mentioned winding speed fluctuation period, and the winding speed fluctuation is changed inversely to the fluctuation of the traverse speed. Weight 5
I hoisted many kg. At this time, fluctuations in the winding tension were extremely small and no ribbon winding was observed.

The fluctuation range of the winding speed relative to the average winding speed varies depending on the type of fiber, fineness, etc., but is ±3%.
On the other hand, the traverse fluctuation range with respect to the average traverse speed was found to be within ±20%, which was a preferable range because the winding tension did not fluctuate much.

As described above, the present invention synchronizes the yarn from the beginning of winding to the end of winding with fluctuations in the traverse speed, and reversely fluctuates the winding speed with a constant amplitude in response to the fluctuations in the traverse speed. I decided to take it, so
Compared to the conventional winding method in which the traverse speed is varied from the normal traverse speed only in the region where ribbon winding occurs under a constant winding speed, the fluctuation in winding tension is extremely small, and especially the strength is extremely low. It is possible to wind yarn whose quality is sensitive to fluctuations in yarn or winding tension without losing its uniformity, and there is no ribbon winding, so the next process can be carried out at high speeds of 1000 m/min or more. There is almost no yarn breakage when unwinding the yarn, and since the traverse speed and winding speed are always varied at the same cycle,
When a plurality of winding machines are driven at once, it is not necessary to start winding all at once, and winding can be started at any time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an apparatus for carrying out the present invention, FIG. 2 is a graph showing the relationship between winding speed and traverse speed fluctuation from the beginning to the end of package winding, and FIG. 1 is a voltage waveform diagram in each winding speed and traverse speed control circuit when implementing the present invention. 14... Traverse device, 15... Winding drum.

Claims (1)

[Claims] 1 A surface friction drive type winding device equipped with a winding drum and a traverse mechanism each driven by a separate drive motor, and when winding yarn at a nearly constant speed, the traverse speed is maintained from the beginning of winding to the end of winding. The winding speed is varied at a constant amplitude and at a constant period based on a constant average traverse speed, and in synchronization with the fluctuation of this traverse speed, the winding speed is varied at a constant amplitude and period at a constant average winding speed. The winding speed is varied by decreasing the winding speed when increasing the traverse speed, and conversely increasing the winding speed when decreasing the traverse speed. Winding method.