JPS60162814A - Method of prevention of occurrence of uneven fineness of roving in roving frame - Google Patents

Abstract

PURPOSE:To obtain always a proper amount of loosening, by operating a device for preventing occurrence of uneven fineness when spinning speed of frame in rotation by inertia reaches a given set value. CONSTITUTION:The solenoid clutch 8 to detect reduction of spinning speed to a given set value is let out. Winding speed becomes low and the roving R starts to loosen. After a given time, the solenoid clutch 8 is connected, and inertia rotation of the bottom cone 5 is retransferred to the short cone shaft 7. The winding speed again becomes higher than the spinning speed, an amount of the roving R which was loosened excessively becomes small, and the roving R shows a proper amount when the frame is stopped.

Description

Detailed Description of the Invention Technical Field This invention relates to a roving cotton tuft in a roving machine that performs variable speed operation such that spinning is performed at high speed at the initial stage of winding of roving, and the spinning speed is reduced as the winding amount increases. This relates to a method of preventing the occurrence.

Conventional technology In general, in roving machines, when the machine is stopped and then restarted, excessive tension is applied to the roving yarn between the front roller and the bobbin, creating fine lumps in the braided yarn, which causes inconvenience in subsequent processes. was there. This is because, as shown in Figure 1, there is a difference in inertia between the rotation transmission systems for transmitting the rotation of the driving pulley 1 to the front door 1, bobbin 3, and flyer 4, respectively. This is because the harmony between the systems is momentarily disrupted and an incorrect draft is given to the spun roving. As a method to prevent the formation of fine clumps of braided yarn when restarting the machine, a conventional method was used in October 1962.
Japanese Patent Publication No. 42-19900 published on May 5th discloses that an electromagnetic clutch 8 is provided on the short cone shaft 7 between the bottom cone drum 5 and the differential gear 416, which constitute the bobbin rotation system of the rover frame. A roving fine agglomeration prevention device has been proposed in which the transmission of rotation from the cone drum 5 to the bobbin 3 can be controlled. In this roving fine lump generation prevention device, as shown in Fig. M2, due to the time-up of timer TR1 which starts counting with the machine stop command, the electromagnetic clutch 8 as a fine lump generation prevention device that has been kept in the connected state until then is activated. The connection is released, the inertia of the bobbin rotation system decreases, the winding speed slows down, and the roving R becomes slack between the front roller 2 and the flyer top 4a. Then, when the timer TR2 starts counting at the same time as the timer TR1 times up, the electromagnetic clutch 8 is connected again after a certain period of time and the bobbin rotation system returns to normal rotation, and when the machine is completely stopped, as shown in Figure 3. , the roving R transitions from a slack and jagged state shown by a chain line to an appropriate slack state shown by a broken line.

On the other hand, in recent years, in order to improve the productivity of roving machines, there has been a trend toward higher speeds and larger packaging of machines. The centrifugal force that acts on the braided yarn during winding increases as the bobbin diameter (that is, the amount of winding) increases and the bobbin rotation speed increases. It is necessary to keep the value below a certain value without causing any adverse effects. Conventionally, the spinning machine was operated to wind the roving by keeping the spinning speed constant and decreasing the rotational speed of the bobbin as the bobbin diameter increased. In this method, the centrifugal force acting on the roving reaches the maximum allowable value near the end of winding when the bobbin diameter is at its maximum, but at the beginning of winding the bobbin diameter, the centrifugal force acting on the roving exceeds the allowable limit. is also a much smaller value. Therefore, the machine is operated at high speed in the early stage of winding, when a large centrifugal force is not generated even if the machine is operated at high speed, and as the bobbin diameter increases, the operating speed of the machine is gradually reduced to improve productivity. The spinning machine dates back to the 4th Showa era.
Special Publication No. 47-42'855, published on October 30, 1972, and Actual Publication No. 1972-446, published on October 11, 1978.
Proposed by 75@ gazette. However, in a spinning machine in which the operating speed of the machine (that is, the spinning speed) is changed sequentially, d3 is reached at the time when the machine stop command is issued.
Since the spinning speed and winding speed are not constant, when the conventional roving side deviation prevention device is applied, it is necessary to ensure a constant and appropriate slack in the roving R when the machine is completely stopped. The problem is that it is not possible.

Purpose This invention was made in view of the above-mentioned conventional problems, and its purpose is to change the speed so that high-speed spinning is performed at the initial stage of winding of braided yarn, and the spinning speed becomes low as the amount of winding increases. The roving 11 [
The object of the present invention is to provide a method for preventing the occurrence of one spot.

Structure of the Invention In order to achieve the above-mentioned object, in this invention, after a machine stop command is issued, a speckle generation prevention device that decelerates the winding speed to be slower than the spinning speed is set so that the spinning speed reaches a predetermined set speed. It was activated when the target was reached.

EXAMPLE Hereinafter, an example embodying the present invention will be described with reference to FIGS. 4-5. The apparatus of this embodiment is different from the conventional method in that a tachometer (not shown) is provided on the main motor (not shown) that drives the driving pulley 1 as a means for detecting the spinning speed after the machine stop command is issued. The equipment is different.

Now, as shown in Fig. 4, when a command to stop the machine is issued during low speed operation close to Manso, the machine rotates due to inertia and the winding speed (shown by the solid line) and the spinning speed (shown by the broken line) gradually decreases. The tachometer attached to the main motor is
When it is detected that the spinning speed has decreased to a predetermined set speed, an electromagnetic clutch serving as a device for preventing generation of fine lumps is disconnected based on the detection signal and is maintained in its disconnected state. This slows down the winding speed and the roving R begins to slacken. Then, the electromagnetic clutch 8 is disconnected.
When timer TR2, which starts counting at the same time as g, times up after a predetermined period of time has elapsed, the electromagnetic clutch 8 is reconnected based on g.

As a result, the inertial rotation of the bottom corn drum 5 is again transmitted to the short corn shaft 7, and the winding speed becomes faster than the spinning speed again as shown in FIG. becomes small, the inertia rotation also stops, and the roving yarn R is in a state with an appropriate slack B when the machine is completely stopped. Further, as shown in Fig. 5, if a machine stop command is issued while the machine is operating at high speed during winding, the machine will rotate by inertia, and the winding speed and spinning speed will gradually decrease. However, in the middle of the decrease, the changing state coincides with the case of inertial rotation of the machine after the machine stop command is issued during the low-speed operation. Therefore, even if a machine stop command is issued during high-speed operation, the timing at which the electromagnetic clutch 8, which serves as a shaft rotation prevention device, is activated is exactly the same as when a machine machine stop command is issued during low-speed operation. When the machine is completely stopped, the roving R has an appropriate amount of slack. Note that the setting stray electricity and the setting time of timer TR2 for determining when to start the operation of the III unevenness prevention device are changed depending on the type of spun yarn.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, instead of providing an electromagnetic clutch 8 on the short corn shaft 7 as a shaft rotation prevention device that reduces the winding speed to be slower than the spinning speed. As shown in FIG. 6, a belt shifter 10 installed on a long rack 9
A solenoid 11 is attached to the belt shifter 10, and one end of a lever 13 with a pivot shaft 12 supported is connected to the plunger 14 of the solenoid 11, and the other end is connected to a fork 16 that holds the belt 15. A device may also be used. In this device, when the spinning speed has decreased to a predetermined set speed, the solenoid 11 is energized based on the detection signal from the rotational speed H1, and the belt 15 is rotated in the direction of arrow P in FIG. Since it is moved in the direction of decreasing the speed, the winding speed is reduced and the amount of slack in the roving R increases. Then, due to the time up of the timer TR2, the excitation of the solenoid 11 is canceled and the belt 15 returns to the normal position, and the winding speed increases and the amount of slack in the roving R becomes smaller, similar to when the electromagnetic clutch 8 is connected. When the machine is completely stopped, the slack amount of the roving yarn R becomes a predetermined appropriate value. Further, as a method of detecting the spinning speed, the rotational speed of the driving pulley 1 or the rotational speed of the flyer 4 may be detected instead of attaching a tachometer to the main motor.

Effects As detailed above, according to the present invention, the spinning speed during the inertial rotation of the machine is maintained at a predetermined level regardless of the difference in the operating speed of the machine, that is, the spinning speed at the time when the machine stop command is issued. Since the shaft rotation prevention device is activated when the set value of This provides an excellent effect of reliably preventing the formation of roving fine lumps at the time of startup.

[Brief explanation of the drawing]

Figure 1 is a schematic perspective view showing the drive mechanism of a roving frame equipped with an electromagnetic clutch as a rotation prevention device, and Figure 2 is a line showing the relationship between spinning speed and winding speed in a conventional rotation prevention device. 3 is a schematic side view showing the condition of the roving between the front 0-ra and the flyer top, and FIG. FIG. 6 is a diagram showing the relationship between the output speeds and a perspective view of a main part showing a modification of the shaft rotation occurrence prevention device. Driving pulley 1, front roller 2, bobbin 3,
Flyer 4, flyer top 4a, electromagnetic clutch 8, roving R0 Patent applicant: i+ Co., Ltd. Toyota Industries Corporation representative
Person Patent Attorney On 1) Hironobu Figure 3

Claims (1)

[Claims] 1. In a roving machine that performs variable speed operation such that high speed spinning is performed at the initial stage of winding of braided yarn, and the spinning speed becomes lower as the amount of winding increases, the winding speed is set to be slower than the spinning speed. A method for preventing the generation of roving yarn in a roving machine, which comprises activating a device for preventing the generation of fine granules that reduces the speed when the spinning speed reaches a predetermined set speed after a command to stop the machine is issued.