JPH05125628A - Method for controlling piecing of automatic winder - Google Patents

Abstract

PURPOSE:To prevent the failure of the subject piecing caused by the stoppage of a package and control the piecing by disposing a rotation sensor for the package and starting a knotting operation after the rotation of the package is stopped or reduced to a desired rotation number. CONSTITUTION:A rotation sensor 10 comprising a notched disk 11 and a contactless switch 12 is disposed for a package, and an air cylinder 13 and a brake arm 15 pressed by the brake arm and rotated on a shaft 14 are disposed as a brake for pressing the package from both the ends of its paper pipe on the cradle 4. 1 pulse per rotation of the package is outputted from the rotation sensor 10, converted into the pulses of 0.15msec through a pulse-shaping device 17 and subsequently inputted into a counter 20. After the rotation of the package is stopped or reduced to a prescribed rotation number, a knotting action is started. Thereby, the failure of the piecing caused by that the package is not stopped after the stoppage of a traverse drum is prevented and the piecing of the automatic winder is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn joining control method for performing a yarn joining operation without fail in an automatic winder.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a winding unit in a conventional automatic winder.

In the winding unit 1, the winding package P is supported by the cradle 4 and placed on the traverse drum 2, and is rotationally driven by the traverse drum 2 in the arrow direction. The yarn Y drawn out from the bobbin 3 is applied with an appropriate tension by the tenser 5, and then passed through the yarn clearer 6 and the yarn splicing device 7 with a built-in yarn cutting cutter and wound into a package P.

When a yarn breakage occurs, the traverse drum 2 is stopped and the winding is stopped. On the other hand, the suction mouth 8 operates to guide the upper yarn on the package P side to the yarn joining device 6, and the relay pipe 9 causes the bobbin to move. The lower yarn on the 3rd side is guided to the yarn joining device 6, and is spliced by the yarn joining device 6, and if the yarn joining is successful, the winding is started again. The yarn splicing device 6 is a type in which both yarn ends are spliced by the action of a swirling air flow.

[0005]

However, as the package P becomes larger, the moment of inertia thereof also becomes larger, and the package P cannot be stopped even if the drive motor of the traverse drum 2 is stopped. The yarn splicing operation is started when the drum is stopped, but since the suction mouth cannot pick up the upper yarn, the first yarn splicing always fails. Such an operation is not only unnatural in appearance, but also causes a reduction in operating time of the winder. When the suction mouth rises, the drum is stopped by mechanically braking to pick up the upper thread, but if the rotation of the package does not stop at this time, the surface of the package will be damaged due to friction with the drum.

Therefore, an object of the present invention is to solve the above problems and to provide a yarn splicing control method for an automatic winder that does not cause a yarn splicing failure due to the above.

[0007]

In order to achieve the above object, the yarn splicing control method of the present invention is provided with a rotation sensor in the package, and the knotting operation is performed after the rotation of the package is stopped or lowered to a predetermined rotation number. Is what starts.

[0008]

In the package, even if the traverse drum stops due to the moment of inertia of the package, the package is not stopped or the rotation speed does not drop to a predetermined value. Therefore, it is possible to eliminate the failure of yarn splicing that has conventionally occurred in the first yarn splicing, and prevent a decrease in the operating time of the winder. Also, a large package without quality damage due to friction can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The overall structure of the winder is the same as that described with reference to FIG. 6, and the description thereof will be omitted.

In FIG. 2A, 10 is a package P.
The rotation sensor is composed of a notch disk 11 and a proximity switch 12 attached to the cradle 4 as shown in FIG. One pulse is output from the rotation sensor 10 per one rotation of the package and converted into a pulse of 0.15 msec through the pulse shaper 17. As shown in FIG. 4, the cradle 4 is provided with an air cylinder 13 and a brake arm 15 which is pressed by the air cylinder 13 and rotates around a shaft 14 as a brake for pressing the package P from both ends of the paper tube.

Returning to FIG. 2 (a), reference numeral 18 is a clock oscillator, and a + 24V power supply line 23 (“notting” PCG2, 5) which is energized only during the yarn splicing operation section is turned on.
By doing so, a clock with a repeat cycle of 0.1 seconds is generated from that point. Reference numeral 20 is a counter that counts this clock, and the counting accuracy is set to 0 by the setter 19.
It is set between 1 second x n (n = 1 to 9). Here 0.
The clock from the oscillator 18 is counted with an accuracy of 1 second.

On the other hand, the pulse from the rotation sensor 10 is input to the reset input of the counter 20 through the pulse shaper 17. Therefore, as long as the package is rotating, one pulse (0.15 msec width) is input to the counter 20 for each rotation of the package, the counting operation is reset, and the counting is not performed. But,
When the package stops rotating, the pulse interval from the rotation sensor 10 becomes longer than the counter set value. That is, the counter 20 counts up to the time set value T and performs the output operation. The time setting value T of the counter 20 does not necessarily need to be based on the time when the package rotation completely stops, and it is sufficient to capture the time (for example, T = 0.4 seconds) when the pulse interval decreases immediately before that. .

When an output appears in the counter 20, the output is held in the latch circuit 21, the drive transistor TR2 is turned on, and the relay RDP is energized. That is, since it can be determined that the time when the relay RDP operates is the time when the rotation of the package stops or the rotation speed decreases to a predetermined rotation speed, the knotting is started from this time.

Specifically, according to the present invention, by confirming the time interval T from the thread cutting to the stop of the rotation of the package as described above, it is confirmed that the rotation of the package is stopped or reduced to a predetermined number of rotations. Then, the knotting operation is started from that point. FIG. 5 is a flow chart showing this. In addition, a contact RDP-2 of the relay TDP
Is used to start the 2-second timer 22, which causes the next control to be executed after a delay of 2 seconds in consideration of the rise time of the suction mouse.

In the time chart of FIG. 1, first, when a yarn breakage occurs during yarn traveling (point a), the power line 23 "in knotting" is turned on. As a result, the cradle lifter / package brake circuit 25 is energized through the a contact RDL-2 of the relay RDL of FIG. 3, the cradle lifter operates, and the valve solenoid valve SV for the air cylinder 13 (FIG. 4) opens and the brake The arm 15 rotates to apply the package brake. Because the relay RD of the cradle lifter circuit 26
L is once energized from the "start" power supply line 24 at the time of the previous drum start, and the a contact RDL-
This is because the voltage of 1 is self-held with respect to the normal + 24V power supply MC, and therefore the a-contact RDL-2 is ON.

When the package rotation detection pulse interval is extended to 0.4 seconds (point b) due to the reason described above due to the brakes decelerating the rotation of the package, an output appears in the counter 20 and the relay RDP operates. As a result, the contact a RDP-1 in FIG. 3 is turned on, and the knotting solenoid SOL is excited. Therefore, the suction mouth 8 in FIG. 7 starts the operation of picking up the upper thread on the package P side and the relay pipe 9 to pick up the lower thread on the bobbin 3 side.

When 2 seconds (the rising time of the suction mouse 8) by the timer 22 elapses (point c), the relay RDSV
Is activated. Therefore, in FIG. 3, its b contact RD
The SV-1 is turned off, and the yarn traveling (FW) circuit 27 is cut off. When the yarn traveling circuit 27 is cut off, as shown in FIG.
Since the setting 19 is invalidated, the counter 20 is not output until the subsequent piecing succeeds and the RD 10A is turned on. In addition, the contact b RDSV-2 of the circuit 26 is OF
Since it becomes F, the relay RDL is deenergized and the contact RDL-
2 is turned off, the cradle lifter / package brake circuit 25 is deenergized, the cradle 4 is lowered, and at the same time, the package brake is also turned off.

During the yarn splicing operation, the suction mouth 8 is swung toward the package P to suck and grip the yarn on the package P side and guide it to the yarn splicing device 6. The relay pipe 9 turns to the bobbin side 3, sucks and holds the bobbin side yarn end, and guides it to the yarn joining device 6. The yarn joining device 7 splices both yarns with air.

When the yarn splicing by the yarn splicing device 7 is completed, the drum start power line 24 is energized to restart winding (point d). As a result, the relay RDDSA of the drum start circuit 28 is energized, and the drum 2 rotates normally. At this time, the cradle lifter circuit 26 returns to the energized state.

FIG. 1 shows a case where the above-mentioned first yarn splicing fails, and when the yarn is cut at the same time as the drum start, or when the yarn splicing is not successful at all, immediately after the drum start time ends, FIG. In a), RD10A-2 is O
Since it is FF, the input X of the OR gate 29 becomes H level at the same time when the notting operation is started, the transistor TR2 is turned on, and RDP is activated (e.
Point), the knotting operation is started. At the same time, the cradle lifter / package brake circuit 25 is energized, but the timer 22 times up after 2 seconds.
Turns on, and the circuit 25 is disconnected. Therefore, the knotting delay as in the ab section does not occur. That is, when a yarn cut occurs, unless the yarn splicing succeeds, normally, the yarn splicing operation is automatically attempted only three times, and if all three fails, the yellow button switch MS1 turns off. There is no knotting delay in the third time, and the knotting delay occurs only in the first time. This is because unlike the case of the first time in which the yarn was wound at high speed, there is no need for delaying knotting in the second and third times. It should be noted that it is possible to easily realize a circuit when it is necessary to delay the second and third times. That is, as shown in FIG. 2B, the RD 10A-2 and the OR gate 29 may be changed.

While the above has described a preferred embodiment of the present invention, the present invention essentially provides a rotation sensor on the package, and the knotting operation is performed after the rotation of the package is stopped or reduced to a predetermined number of rotations. Just start.

[0022]

As described above, according to the present invention, the knotting operation is not started until the traverse drum stops and the package does not stop or the rotation speed does not drop to a predetermined number of revolutions. Can be picked up without failure. Therefore, the failure of the splicing which has conventionally occurred in the first splicing is eliminated, and the reduction of the operating time of the winder can be prevented. In addition, a large package without quality damage due to friction can be obtained.

[Brief description of drawings]

FIG. 1 is a time chart diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a part of a control circuit according to an embodiment of the present invention.

FIG. 3 is a diagram similarly showing a part of a control circuit.

FIG. 4 is a view showing a cradle portion.

FIG. 5 is a flowchart showing a control method according to an embodiment of the present invention.

FIG. 6 is a schematic view showing a conventional automatic winder.

[Explanation of symbols]

1 winding unit 2 traverse drum 3 bobbin 4 cradle 5 tensor 6 yarn clearer 7 yarn splicing device 8 suction mouse 9 relay pipe 10 rotation sensor 11 notch disk 12 proximity switch 13 air cylinder 14 axis 15 brake arm 17 pulse shaper 18 Clock oscillator 19 Setting device 20 Counter 21 Latch circuit 22 2 second timer 23 Power line for "notting" 24 Power line for "start" 25 Cradle lifter / package brake circuit 26 Cradle lifter circuit 27 Drum forward rotation (FW) circuit 28 Drum Start circuit P package Y thread TR2 drive transistor RDP, RDSV, RDL, RDDSA, RD10A
Relay SOL Notting solenoid SV Solenoid valve

Claims (1)

[Claims] 1. A yarn splicing control method for an automatic winder, wherein a rotation sensor is provided on a package, and the knotting operation is started after the rotation of the package is stopped or reduced to a predetermined number of rotations.