JPH05774U - Draft device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to prevent the front roller and the spinning unit from being damaged when fiber winding around the front roller occurs. [Structure] A sensor 8 for detecting fibers wound around the front roller 6 is provided near the front roller 6, and the sensor 8
Is provided with a front roller emergency stop mechanism 7 which disengages the clutch 12 of the front roller drive system to stop the front roller 6 when the fiber winding around the front roller 6 is detected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a draft device for a spinning machine.

[0002]

[Prior Art]

 During spinning with an air spinning machine, if the nozzle unit becomes clogged with leaf shavings with a large sliver width, stems, undisentangled fibers, large slabs due to defective draft, etc., and the fiber bundle cannot be sucked into the nozzle unit, the yarn passes through the nozzle unit. The slab catcher provided after the nozzle unit detects this, and based on the signal, the back roller and middle roller of the draft device stop, the sliver intake is stopped, and the draft device enters the draft device. The fiber bundle that had been used is torn between the stopped middle roller and the constantly rotating front roller. Then, the fiber bundle thus torn off is sent out from the front roller toward the nozzle unit and sucked by the dust collector provided below the front roller. However, a part of the fiber bundle that should be sucked into the dust collector may rarely get wrapped around the front roller, and especially when spinning with a heavy yarn count or when using a draft with an ultra-high ratio, the amount of fiber supplied is large, and The fiber is wrapped around the front roller surface with a considerable thickness. At present, even in such a state, the front roller continues to rotate, which causes damage to the apron, front roller, nozzle unit, etc. attached to the middle roller.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to prevent damage to the front roller and the spinning unit when the fiber winding around the front roller occurs.

[0004]

[Means for Solving the Problems]

 A sensor for detecting the fiber wound around the front roller is provided near the front roller, and a front roller emergency stop mechanism is provided for stopping the front roller when the sensor detects the fiber wound around the front roller.

[0005]

[Action]

 In the draft device of the present invention, when the fiber winding around the front roller occurs, the sensor detects it, operates the front roller emergency stop mechanism to stop the front roller, and the front roller rotates while the fiber is wrapped around. Continue to prevent damage to the rollers.

[0006]

【Example】

 In FIG. 1, in the draft device 2 according to the present invention, which is arranged in front of the pneumatic spinning unit 1, a back roller 3, a middle roller 5 for driving an apron 4, and a front roller 6 are sequentially arranged in the traveling direction of the fiber bundle S. Although it has a basically well-known structure, the front roller emergency stop mechanism 7 according to the present invention is additionally provided. Immediately, a sensor 8 capable of detecting the winding of the fiber bundle on the top roller 6a or the bottom roller 6b is attached to the front roller 6 close to the front roller, and the sensor 8 is connected to the control device 9. Has been done. The control device 9 controls the electromagnetic clutch 12 of the pulley 11 with the electromagnetic clutch provided on the drive shaft 10 of the bottom roller 6b, and the electromagnetic force is maintained while the sensor 8 does not detect any abnormality on the peripheral surface of the front roller 7. When the clutch 12 is turned on and the bottom roller 6b is rotated via the belt 13 spanning between the pulley 11 with the electromagnetic clutch and the bottom roller 6b, when the abnormality detection signal is received from the sensor 8, The clutch 12 is turned off to stop the driving of the bottom roller 6b.

An example of the sensor 8 will be described next. The sensor 8 shown in FIG. 2 uses a micro switch 14, and the roller 15 is rotatably supported by the tip of the swing arm 16 at a slight distance from the peripheral surface of the front roller 6. The oscillating arm 16 is configured to oscillate by the displacement of the roller 15 according to the change in the diameter D of the front roller 6 due to the winding of the fiber bundle around the surface of the front roller 6 to push the push button 17 of the micro switch 14. The push button 17 is not pressed when there is no fiber bundle on the circumference of the front roller 6, and the push button 17 is pressed when the apparent front roller diameter D increases due to the fiber bundle winding and the roller 15 is displaced. Has been done. The roller 15 may be provided so as to contact the peripheral surface of the front roller 6.

However, the sensor 8 is not limited to the micro switch, and any other type such as photoelectric type can be used. In the case of the photoelectric type, by placing a light emitter and a light receiver on both ends of the roller, placing their optical axes parallel to the roller axis, and selecting the distance between the optical axis and the roller peripheral surface as appropriate. Detecting the amount of wrapping, and actuating the clutch when the wrapping fiber crosses the optical axis.

Since the draft device is provided with the front roller emergency stop mechanism 7 as described above, this draft device causes the front roller 6 to move to the front roller 6 for some reason such as the stop of the operation of the pneumatic spinning unit 1 during spinning. When the fiber bundle wrapping occurs, the sensor 8 detects it, and the control device 9 disengages the electromagnetic clutch 12 accordingly, so that the front bottom roller 6b automatically stops and the front top roller 6a also stops accordingly. As a result, damage to the device that may occur if the front roller 6 continues to rotate while the fiber bundle is wound around the front roller 6 is prevented. In the above-described embodiment, both the top roller 6a and the bottom roller 6b of the front roller 6 are provided with the sensors 8, respectively, but only one of them may be provided. In this case, it is the bottom roller 6b that the fibers are easily wound, and therefore it is preferable to provide the fibers on the bottom roller 6b side.

[0010]

[Effect of the device]

 As described above, the draft device of the present invention is provided with a sensor near the front roller that can detect the winding of the fiber on the front roller, and when the sensor detects the winding of the fiber on the front roller, the clutch of the front roller drive system is disengaged. Since the front roller emergency stop mechanism that stops the front roller is provided, if the fiber bundle winding around the front roller occurs, it can be detected immediately and the rotation of the front roller can be stopped. It has an effect that the front roller and the inlet portion of the air spinning unit are not damaged.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of the device of the present invention.

FIG. 2 is an enlarged explanatory view of a sensor in the embodiment of FIG.

[Explanation of symbols]

 1 Pneumatic spinning unit 2 Draft device 6 Front roller 7 Front roller emergency stop mechanism 8 Sensor 9 Control device 12 Electromagnetic clutch

Claims (1)

[Claims for utility model registration] Claims: 1. A front roller for detecting a fiber wound around a front roller is provided in the vicinity of the front roller, and when the sensor detects a fiber wound around the front roller, the front roller is stopped. Draft device with an emergency stop mechanism.