JPS6324091B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a full tube stop device in a roving frame, and in particular to a device that reduces the winding speed to be slower than the sending speed after a machine stop command is issued. It is equipped with a speckle prevention device.

(Prior art) In general, in a roving machine, when the machine is stopped and then restarted, excessive tension is applied to the roving yarn between the front roller and the bobbin, causing fine spots on the roving yarn. There was a problem of inconvenience. As shown in Fig. 6, the rotation of the driving pulley 1 is controlled by the front roller 2, bobbin 3,
Because there is a difference in inertia between each rotational transmission system for transmitting information to the flyer 4, the harmony between each rotational transmission system is instantaneously lost upon restart, and an incorrect draft is given to the spun roving. It is considered. As a method to prevent the occurrence of fine spots in the roving yarn when restarting the machine, there has been a conventional method for preventing the occurrence of fine spots in the roving yarn by using a bottom cone constituting the bobbin rotation system of the roving machine. A roving fine unevenness prevention device is provided in which an electromagnetic clutch MC is provided on a short cone shaft 7 between a drum 5 and a differential gear mechanism 6 to control the transmission of rotation from the bottom cone drum 5 to the bobbin 3. Proposed. This roving yarn fineness prevention device is operated by a control circuit shown in FIG. In other words, due to the time-up of timer TR1, which starts counting with the machine stop command, the electromagnetic clutch MC, which had been kept connected until then, is disconnected, and the inertia of the bobbin rotation system decreases, causing the winding speed to slow down. When the roving yarn R becomes slack between the roller 2 and the flyer top 4a, the timer TR2, which starts counting at the same time as the timer TR1 times up, connects the electromagnetic clutch MC again after a certain period of time, and the rotation system returns to normal rotation. When the machine is completely stopped, as shown in FIG. 8, the roving R shifts from an excessively slack state indicated by a chain line to an appropriately slack state indicated by a solid line. In the conventional device, the speckle generation prevention device operates even when the tube is full, in the same way as when it is stopped halfway.

On the other hand, in a roving frame, it is always necessary to cut the end of the roving thread on the bobbin at some point during the doffing operation when the bobbin is full. The cutting position is preferably between the tip of the presser 8 and the bobbin 3 in consideration of the next winding operation. In the roving frame, the bobbin rail 9 is lowered to a position where the upper end of the bobbin 3 is separated from the spindle 10 of the flyer 4 during doffing when the bobbin is full. In the case of spinning fibers with low tension such as cotton, when the bobbin rail 9 moves downward, the roving R is moved between the presser 8 and the bobbin 3 as shown in FIG. 9 due to the resistance at the presser 8. will be cut off. However, in the case of spinning fibers with high tension such as synthetic fibers, the frictional resistance of the roving R at the presser 8 portion during the downward movement of the bobbin rail 9 cannot cut the roving R, and the roving R cannot be cut. As shown in the figure, the tension propagates to the upper part and the roving yarn R near the front roller 2.
This caused the inconvenience of disconnection. Conventionally, when spinning synthetic fibers, when the bobbin rail 9 is stopped at full capacity, the roving is loosened by an amount that will not be cut when the bobbin rail 9 is lowered, and the operator manually cuts the roving yarn after the bobbin rail 9 has finished lowering, and the next An appropriate length was drawn out during winding. Therefore, it took a lot of time and effort to doffing.

(Problems to be Solved by the Invention) The problems to be solved by the present invention are a decrease in work efficiency due to manual cutting of rovings during doffing during spinning of synthetic fibers, and an accompanying reduction in machine efficiency. This is a decrease in operating efficiency.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes a speckle occurrence prevention device that decelerates the winding speed so that it becomes slower than the feeding speed after a machine stop command is issued. In the roving machine equipped with the above-mentioned roving frame, a configuration is adopted in which the operating time of the speckle generation prevention device is changed between when the tube is full and when the tube is stopped halfway, and a circuit is provided to lengthen the operation time when the tube is full and stopped. .

(Function) In this invention, when the flyer is full, the speckle generation prevention device that decelerates the winding speed to be slower than the feed speed after the machine stop command is activated for a long time, and the As the slack in the roving becomes very large, the weight of the slack part becomes large, and even in the case of spinning machines that use high-tension fibers such as synthetic fibers, the roving will not come into contact with the presser and bobbin during the downward movement of the bobbin rail during doffing. disconnected between.

(Example) Next, examples 1 to 3 embodying this invention will be described.
This will be explained according to the diagram. In the apparatus of the present invention, the driving mechanism of the roving frame is the same as that of the conventional apparatus shown in FIG. 6, and only the configuration of the control circuit for operating the speckle generation prevention device is different. The configuration of the control circuit will be explained according to FIG. 2. The first circuit has a normally closed contact MS11b of a main motor drive electromagnetic contactor (not shown) and a timer TR1 connected in series, and the second circuit has Said timer TR
1 normally open contact TR1a and timer TR2, which will be described later.
Normally closed contacts TR2b, TR3b of TR3 and relay
CR1 is connected in series. The third circuit has a timer TR for setting the operating time of the electromagnetic clutch MC of the speckling prevention device when stopping during operation.
2 is connected to the fourth circuit, and a timer TR3 is connected to the fourth circuit for setting the operating time of the electromagnetic clutch MC when the pipe is stopped full. Further, bidirectional contacts LSb and LSa, which are switched and operated based on the full-pipe signal, are connected to the third and fourth circuits, respectively. The normally closed contact CR1b of the relay CR1 and the electromagnetic clutch MC are connected in series to the fifth circuit.

Next, the operation of the apparatus configured as described above will be explained. The bidirectional contacts LSa and LSb are set to keep the third circuit closed and the fourth circuit open when a full tube signal is not issued. When the machine continues to operate and becomes full, the bidirectional contacts LSa and LSb are switched by the full pipe signal, a machine stop command is issued, and the motor drive electromagnetic contactor is demagnetized and placed in the first circuit. Its normally closed contact MS11b closes and timer TR1
starts counting. Due to the time-up of timer TR1, relay CR1 is energized and its normally closed contact CR1b in the fifth circuit is opened, and electromagnetic clutch MC is demagnetized and disconnected.
TR3 starts counting. Electromagnetic clutch MC
When the front roller 2 is disconnected, the inertia of the bobbin rotation system decreases and the winding speed becomes slower.
The roving yarn R begins to loosen between the flyer top 4a and the flyer top 4a. Before the machine comes to a complete stop, timer TR3 times up, the second normally closed contact TR3b opens, and relay CR1 is demagnetized. As a result, the normally closed contact CR1b in the fifth circuit, which had been open until then, closes, the electromagnetic clutch MC is energized, and the bobbin rotation system returns to steady rotation, after which the machine completely stops. The time set by timer TR3 is set for the front roller 2 and flyer top 4a when the machine is stopped.
As shown in FIG. 1, the rovings R are set so that there is sufficient slack between them. As shown in FIG. 1, when the bobbin rail 9 is moved downward with the roving yarn R between the front roller 2 and the flyer top 4a sufficiently slack, the weight of the roving yarn R in the slack portion is large, so it is removed from the bobbin 3. A tensile force is applied to the roving R connected to the thread 8, and even if the tension propagates to the slack part, the force sufficient to completely eliminate the slack is not transmitted, and the roving R is cut between the bobbin 3 and the presser 8. be done. Specifically, 2g for the roving R of 8 parts of Pretusa.
If the roving R, which is to be cut when the above force is applied, loosens to the point where it comes into contact with the top rail 11, the bobbin rail 9 When descending, the roving R becomes more likely to break between the bobbin 3 and the presser 8.

When the full tube signal is not being issued, the bidirectional contacts LSa and LSb are held in the state where the third circuit is closed and the fourth circuit is open, so if a machine stop command is issued during machine operation, the timer is activated. TR3
is not activated and timer TR2 is activated, so the electromagnetic clutch MC of the speckle generation prevention device is activated as in the conventional device. The set times of timers TR1, TR2, and TR3 can be changed according to the spinning conditions.

Note that the present invention is not limited to the above-mentioned embodiment. For example, instead of providing an electromagnetic clutch MC on the shot cone shaft 7 as a device for preventing the occurrence of fine spots, a long clutch 12 as shown in FIG. 4 may be used.
A solenoid is attached to the belt shifter 13 installed in the
Attach the SOL and connect one end of the lever 15 with the pivot shaft 14 supported by the belt shifter 13 to the plunger 16 of the solenoid SOL,
The belt 17 may be controlled by a control circuit shown in FIG. 5 using a device in which the other end is connected to a fork 18 that clamps the belt 17. In this case, the solenoid SOL is energized by the time-up of the timer TR1, and the belt 17 is moved in the direction of arrow P in FIG. The amount of slack in R increases.

Effects of the Invention As detailed above, according to the present invention, the amount of slack in the roving yarn when the roving machine is stopped at full capacity can be increased by a simple configuration of changing the control circuit of the speckle generation prevention device installed in the roving machine. Therefore, even when spinning fibers with high tension such as synthetic fibers, the roving connected to the bobbin is cut between the bobbin and the presser when the bobbin rail moves downward during doffing, making it unnecessary to cut the roving manually. It is not necessary, and has the excellent effect of saving labor and increasing the operating efficiency of the machine.

[Brief explanation of the drawing]

1 to 3 show an embodiment embodying the present invention, in which FIG. 1 is a schematic side view showing the state of the roving between the front roller and the flyer top when the tube is full and the flyer top is stopped; The figure is a control circuit diagram of the speckle generation prevention device, Figure 3 is a side view for explaining the action, and Figures 4 and 5 show modified examples. A perspective view of main parts showing the device,
FIG. 5 is a control circuit diagram thereof, FIG. 6 is a schematic perspective view showing a driving mechanism of a roving frame equipped with an electromagnetic clutch as a device for preventing generation of fine spots, and FIG. 7 is a control circuit diagram thereof.
FIG. 8 is a schematic side view showing the state of the roving between the front roller and the flyer top when the machine is stopped, and FIGS. 9 and 10 are side views showing the state of cutting the roving when the bobbin rail of the conventional device is lowered. Front roller 2, bobbin 3, flyer 4, flyer top 4a, presser 8, bobbin rail 9, belt shifter 13, roving R, electromagnetic clutch
MC, timers TR1, TR2, TR3.

Claims (1)

[Claims] 1. In a roving machine equipped with a speckle generation prevention device that reduces the winding speed to be slower than the feed-out speed after a machine stop command, the operation of the speckle generation prevention device occurs when a full tube is stopped and when the tube is stopped halfway. A full tube stop device for a roving machine, characterized in that a circuit is provided for changing the time and lengthening the operating time when the full tube is stopped.