JPH0341567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting the end of a roving during doffing in a roving frame.

In a roving frame, when doffing is performed from the machine stand after spinning, it is necessary to cut the roving end of the bobbin somewhere. Conventionally, the roving end 2 was cut at approximately the center of the full bobbin 1 as shown in Fig. 1, but the roving spool 1 with the roving 2 cut at such a position is attached to a creel for a spinning machine. When suspended as a preliminary roving winding, the roving 2 continues to hang down from the roving winding 1 due to a small shock. Therefore, in order to prevent this, the roving end 2 was sandwiched between the roving yarns, or the roving end 2 was stopped with tape to prevent the roving from sagging, but these methods not only require a lot of work but also It was also inconvenient to change the roving.

The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to cut the roving at the upper tapered part of the full bobbin and place the end of the roving at the upper tapered part to prevent the roving from hanging down. It's about doing.

Next, the method of cutting the roving end of the present invention will be explained with reference to FIGS. 2 to 5. In most cases of roving machines, winding is carried out using a bobbin reed, but while the amount of roving 3 fed out from the front roller 5 is constant, there is Since the diameter of the roving winding 4 differs depending on the time, in order to keep the winding speed of the roving 3 constant, the rotational speed of the bobbin 6 is decreased as the diameter of the roving winding 4 increases using a cone drum transmission or the like. The present invention utilizes this speed change effect to cut the roving 3 at the tapered part 4a of the upper part of the roving winding. Lower the bobbin rail 9 and stop the roving winder 4 until the tapered part 4a of the upper part of the roving winder is at the same height as the presser 8 at the tip of the flyer 7, and at that position, move the bobbin 6 to the point at which spinning begins. The roving 3 is cut as shown in Fig. 4 by rotating the roving at the same speed, that is, at a speed higher than the winding speed than the feeding speed of the roving 3 from the front roller 5, and the roving tail end 3a is cut. Make sure that it rests on the tapered part 4a of the upper part of the bobbin winder. After cutting the roving yarn 3, the bobbin rail 9 is lowered to the doffing position as shown in FIG. 5 to perform doffing.

Next, the main part (drive part) of the roving frame improved to be able to carry out the method of the present invention described above will be explained with reference to FIGS. 2 to 6. The rotation of the main motor 10 is transmitted to the main drive shaft 14 via pulleys 11 and 12 and a V-belt 13 between them. The flyer 7 includes a timing pulley 15 fixed to one end of the main drive shaft 14, a timing belt 16 as shown, and a timing pulley 1.
7, intermediate shaft 18, and mutually meshing helical gears 1
9 and 20. The front roller 5 is a roller shaft 3 driven by a spur gear 21 fixed to a drive shaft 14 via a lower gear 22, a middle gear train 28-29, and an upper gear train 30-31.
It rotates together with 2. Further, a pulley 24 is connected to one side of the gear 22 via a one-way clutch 23, and the pulley 24 and the flyer proper position stop motor 2 which rotates at a gentle speed.
The rotation of the motor 25 is controlled by the gear 22 through a pulley 26 fixed to the gear 5 and a V belt 27 between the pulleys 26 and
has been communicated to. Therefore, when the drive unit is operated by the main motor 10, the one-way clutch 23 idles, and the rotation of the spur gear 22 is transmitted to the pulleys 24, 26, V-belt 27, and motor 25 after the one-way clutch 23. When the drive section is operated by the flyer proper position stop motor 25, the one-way clutch 23 is connected and rotation is transmitted to the gear train after the spur gear 22.

Next, to explain the drive mechanism of the bobbin 6, the intermediate shaft 33 to which the third gear 29 of the intermediate gear train is fixed
A cone drum 34 is fixed to the other end, and a belt 36 is tensioned between the cone drum 34 and the corresponding cone drum 35 in a reverse direction so as to be able to move laterally.
is formed, and as the diameter of the roving winding 4 increases, the cone drum belt 36 is moved from the position A to the position B in FIG. 6 by a cone belt moving device (not shown). The reduction ratio between the cone drum 35 and the cone drum 35 increases, and if the rotational speed of the cone drum 34 is kept constant, the rotational speed of the cone drum 35 and the subsequent driving parts becomes small. The cone drum 35 rotates from its shaft 38 to the gears 39, 40, the intermediate shaft 41, and the gear train 4 in the previous stage.
A differential gear 4 linked to the main drive shaft 14 via 2
4 is transmitted to an external gear 43 of a composite gear loosely fitted to the main drive shaft 14 on one side. This actuating device 4
4 has an arm 4 fixed to the main drive shaft 14 at its center.
Planetary gears 49 and 50 are respectively fixed to both ends of an intermediate shaft 46 that passes through the tip of the intermediate shaft 46. They mesh together. Although not shown, the intermediate gear 48 is pivotally supported by a part of the arm 45. The other planetary gear 50 meshes with an internal large gear 51 that is loosely fitted on the main drive shaft 14 on the other side of the differential 44, and a gear 52 is combined with this internal large gear 51. The rotation of this gear 52 is caused by the subsequent gear train 52.
53 to the intermediate shaft 54, and the bobbin 6 is further driven via the helical gears 55 and 56.

The speed change mechanism 37 using the cone drums 34, 35, etc. and the speed reduction mechanism using the differential device 44 linked to the main drive shaft 14 described here have configurations that have been widely used in drive units of roving machines in the past, but the present invention In addition to this, the intermediate gear 22 in the power transmission system from the main drive shaft 14 to the front roller 3 and the cone drum transmission mechanism 37 is provided with a one-way clutch 23, pulleys 24, 26, and a timing belt 27. Since the rotation of the fryer proper position stop motor 25, which rotates at a high speed, is transmitted, the drive section can be operated at a moderate speed.

To describe the operation when carrying out the method of cutting the roving end according to the present invention using the device improved in this way, during spinning, the front roller 5 is operated by the above-mentioned series of gear trains 21 in the upper, middle, and lower stages. ~31, and the flyer 7 is a timing belt 1 of a different system.
6, each is rotated at a constant speed from the main drive shaft 14. On the other hand, the bobbin 6, together with the winding thread 3, undergoes a speed change action of a cone drum speed change mechanism 37 driven by the main drive shaft 14 via the lower and middle gear trains 21 to 29, and is rotated under the speed change action. The combination of the sun gear 47, the planetary gears 49 and 50 that revolve from the main drive shaft 14 via the arm 45, and the internal large gear 51 generates a deceleration effect in the differential device 44. gear train 5
The bobbin reed is rotated at variable speeds according to the winding diameter at each point in time via the spiral gears 55 and 56 using the rotational speed transmitted to the windings 2 to 53. When the bobbin 6 is filled with the roving 3 sent out from the front roller 5, the machine stops and the belt 36 of the cone belt transmission mechanism 37 is moved by the cone drum belt automatic return device (not shown) as shown in FIG. Re-thread the bobbin from position B to the position at the beginning of the 6th winding of the bobbin as shown in Figure 6A. Next, a bobbin rail lifting motor (not shown) is driven to lower the bobbin rail 9 until the roving winding upper tapered part 4a is at the same height as the presser 8 at the tip of the flyer 7, and then stop at that position. The flyer proper position stop motor 25 is driven. At this time, since the rotational speed of the motor 25 is low, the machine base is operated at a gentle speed, and the cone belt 36 is at position A at the beginning of the sixth winding of the bobbin, so the bobbin rotates at a high speed. On the other hand, since the roving winding 4 is in a full state, the diameter is larger than that at the beginning of the 6th winding of the bobbin.
Since the outer peripheral speed of the roving winding 4 becomes faster, the roving winding speed becomes faster than the amount of feeding of the roving 3 from the front roller 5, and the tension applied to the roving 3 is at a maximum at a position 50 to 60 mm from the tip of the pretusa battledore 8a. The roving 3 is naturally cut, and the roving end 3a rests on the tapered part 4a of the upper part of the roving. After cutting the roving, the flyer proper position stop motor 25 is stopped, and the bobbin rail is lowered to a predetermined position for doffing by the bobbin rail lifting motor.

As described in detail above, in the present invention, after the machine is stopped, the belt of the cone drum transmission mechanism is re-strung to the bobbin winding start position, and then the bobbin rail is moved until the tapered part of the upper part of the roving winding is at the same height as the presser at the tip of the flyer. is lowered, and at that position, the flyer is stopped at a suitable position and the motor is driven to drive the machine at a gentle speed. At this time, the cone belt 36 is in the position at the beginning of bobbin winding, so the bobbin rotates at a high speed equal to the amount of roving fed out from the front roller, while the roving is fully wound. Therefore, the diameter is larger than at the beginning of bobbin winding, and the outer circumferential speed of roving winding becomes faster, so the roving winding speed becomes faster than the amount of roving sent out from the front roller, and the tension applied to the roving is at its maximum from the tip of the Pretusa battledore. The roving was cut naturally at a position of 50 to 60 mm, and the end of the roving was placed on the tapered part of the upper part of the roving.
When this roving is suspended on a creel for a spinning machine, the roving does not hang down due to the small shock, and instead of being pinched between the roving threads at the end of the roving or using tape to stop the end of the roving, as in the past. There is no need to prevent drooping by a method that is time-consuming and inconvenient to change the roving.

[Brief explanation of drawings]

Fig. 1 is a side view showing the cutting state of the end of the roving in a conventional roving frame, Figs. 2 to 5 are side views showing the operating method of the present invention from full pipe to doffing, and Fig. 6 is the side view of the present invention. FIG. 3 is a perspective view of a winding drive section showing one embodiment of the present invention. 3... roving, 3a... roving winding end, 4... roving winding, 4a... roving winding upper tapered part, 5... front roller, 6... bobbin, 7... flyer,
8...Pretusa, 8a...Pretusa battledore, 9...
...Bobbin rail, 14...Main drive shaft, 22...Intermediate gear, 23...One-way clutch, 24...
Pulley, 25... Flyer proper position stop motor,
37... Corn drum transmission mechanism, 44... Differential device.

Claims (1)

[Claims] 1 After stopping the full bobbin, lower the bobbin rail, stop the bobbin rail at the position where the pretusa battledore is at the height of the upper tapered part of the full bobbin, and move the bobbin until the roving winding speed is faster than the roving feeding speed. A method for cutting the end of a roving during doffing in a roving machine, which comprises rotating the roving at a speed such that the roving is cut at an upper tapered part of a full bobbin.