JPH03199431A - Drafting apparatus of spinning frame - Google Patents

Abstract

PURPOSE:To draft a sliver of fiber having long fiber length at a high drafting ratio by using a middle roller as a drum roller and a middle nip roller, winding a fiber around the drum roller and supplying the fiber from a back roller to a front roller. CONSTITUTION:Fiber 1 supplied from a back roller 5 is wound round a side face of a drum roller 13 of a middle roller and subjected to the 1st stage drafting in a state clamped between the drum roller and a middle nip roller 14. The 2nd stage drafting of the fiber is carried out between the middle roller and a front roller 8 and the fiber is pressed against a side face of the drum roller by the drafting force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a draft device for a spinning machine for drafting sliver, particularly to a draft device for long fibers. <Conventional technique (fiΣ) In this type of conventional spinning vJn, as shown in FIGS. 4 and 5, the sliver 31 stored in a can is passed through a trumpet guide 32, each consisting of a pair of upper and lower rollers. The sliver is drafted through a back row 533, an apron belt 35 driven by a middle roller 34, and a front roller 36, respectively.The sliver drafted by such a drafting device is spun in a spinning nozzle 38, and passed through a nibbing roller 39 and a delivery roller 40. When the S fibers drafted in the drafting device of a conventional spinning machine are of type 1Ili, the fibers are passed between the back roller 33 and the gibil row 934, and between the idle roller 34 and the front roller. A large draft is performed by performing a two-stage draft between the back roller 33 and the middle roller 36, and a large draft. It must be shorter than either of the distances f12 between the middle roller 34 and the front roller 36.At this time, if either of the distances ℃ or ℃2 is shorter than the fiber length, one end of one AI-gaya is attached to the upper and lower rollers. Since the upper and lower rollers in the next stage pull other parts of the fiber while it is being held between the fibers, fiber breakage occurs and sufficient drafting cannot be achieved. 2 to 15 IJ between each roller when drying long i-fibers from 71 to 71.
In order to perform the drafting of the stages, both the roller spacings i and i2 must be set to at least 15- or more, which increases the overall length and increases the size of the spinning machine. . In addition, when drafting such long fibers, the middle roller 34 is not drafted by reducing the diameter of the central portion in the longitudinal direction of the middle roller 34, and only the fiber gripping action is performed by the apron belt 35. Back roller 33 and front roller 3
A method of drafting in 6 minutes is also adopted. However, in that case, although it is sufficient that the distance between the back roller 33 and the front roller 36 is longer than the fiber length, only one stage of draft C is performed, and only a small draft can be performed. In order to perform a large draft in the stages, it is also possible to arrange two stages of such draft devices in series along the fiber feeding direction, but in this case it is unavoidable that the spinning machine becomes larger. Moreover, there was a drawback that the drive system became complicated. Furthermore, when drafting such long fibers, the apron belt is used to grip the fibers, so the fibers sliding on the apron belt cause the surface to become I! There was also the drawback that the lifespan became known after the test. Problems to be Solved by the Invention J In view of the above-mentioned points, the present invention provides a screwdriver 71~) which is capable of drafting a sliver made of wool having a long fiber length n or other fibers H at a high draft rate. The purpose is to obtain. 1. Means for Solving Problems) The present defense proposes a spinning method in which a pair of middle rollers is arranged between a pair of back rollers and a pair of front rollers to draft a sliver, in order to eliminate the drawbacks of the draft device of the conventional spinning machine. In the machine's drafting device, one of the pair of middle rollers is a drum roller, and a middle nip roller is provided that presses against the side of the drum roller, and the fibers from the back roller are wound around the outer circumferential surface of the middle roller and then supplied to the front roller. This allows a large draft of Mas sliver to be achieved using a small spinning machine. By configuring the present invention as described above, the fibers from the back roller are wound around the side surface of the drum roller of the middle roller, and are held between the middle nip roller and the first roller.
A stage draft is performed, and then a second stage draft is performed between the fibers and the front roller, and the draft force of the front roller at that time applies a force to press the fibers wrapped around the middle roller against the side surface of the middle roller. . In the above, since the middle roller is a drum roller, the nip point with the drum nip roller in contact with it,
The running of the sliver between the back roller pair and the front roller z/1 (it is possible to make one length longer than the fiber length). The explanation will be based on. In front of the trumpet guide 2 that guides the sliver 1 stored in the can, there is a back roller pair 5 consisting of a back bottom roller 3 and a back top roller 4 as in the conventional case, and a front consisting of a front bottom roller 6 and a front top roller 7. Provide loaf pairs 8. Guides 9 and 10 are provided in front of the back roller pair 5, and the guides 9 and 10 are located between the guides 9 and 10 on the side of the running direction of the drafted a fiber, and are located along the axis of the back roller pair 5 and the front roller pair 8. A middle roller 12 is provided which rotates around a shaft 11 which is also arranged at right angles to the direction. Side surface 13 of this middle roller 12
A part of the sliver 1 is made to coincide with the traveling path of the sliver 1. A middle nip roller 14 is provided on the side surface 13 of the middle roller 12.
Press them together. A belt 20 is stretched between a pulley 15 (shown in FIG. 2) provided at the bottom of the middle roller 12 and a pulley 19 provided on the drive shaft 18 of the back bottom roller 3 via a guide roller 16.17. . The drive shafts 18 of the backboard 1 to roller 3 are immediately moved from the outside by a belt 21. The guide 1o is positioned so as to convey the sliver to the nip point of a pair of front rollers 8 consisting of a front bottom roller 6 and a front top roller 7, and in front of it are an air spinning nozzle 22 and a telly roller 2 as in the past.
3 will be provided. In the spinning machine constructed in this manner, the sliver 1 is guided by the trumpet guide 2, passes from the back roller pair 5 through the guide 9, and is wound once around the side of the middle roller 12.
1, pass through the guide 10 and move Freon 1 to f”-Ra vs. 8
The draft is then carried out. The sliver wrapped around the side blood 13 of the middle roller 12 is held between the middle roller 12 and the middle nip roller 14, while the side surface 1 of the middle roller 12 rotates at a faster circumferential speed than the back roller pair 5.
3, the first stage draft is performed. Historically, between the nip point between the middle nip roller 14 and the middle roller 12 and the nip point of the front roller pair 8, the front roller pair 8, which rotates at a higher speed than the circumferential speed of the side surface 13 of the middle roller 12, A two-stage draft is performed. When pulling the S fiber with the front roller pair 8, aM wrapped around the middle roller 12! is strongly pressed against the side surface 13 of the middle roller 12 by its force, and can provide appropriate resistance to the a-fibers, similar to the conventional apron belt. Moreover, the resistance 11 can be arbitrarily applied by changing the material of the side surface 13 of the middle roller 12 and the shape of the groove formed on the surface thereof. Thereafter, it is heated by an air spinning nozzle 22 and wound up into a package (not shown) via a delivery roller 23. In this way, the 1lilf from the back roller pair 5 goes around the outer peripheral surface 13 of the middle roller 12 and then reaches the front roller pair 8, so even if the distance between the bank roller pair 5 and the front roller pair 8 is short, the fiber The supply path can be made long, and not only can it handle long fibers, but also the middle roller 12 can be made with a large diameter.
By drafting the fibers held between the nip roller 14, two-stage drafting can be performed.
A small spinning machine can draft a long fiber sliver in two stages, making it possible to achieve a high draft. In the embodiment shown in FIGS. 1 and 2 above, the shaft 11 of the middle roller was arranged perpendicularly to the axes of the back roller pair 5 and the front rollers 18, but as shown in FIG. It is also possible to arrange the shaft 11 of the middle roller parallel to the shaft. At that time, the middle roller 25 is arranged so that the side surface 26 is directly below the fiber supply path from the back roller to the front roller. This middle roller 2
A nip roller 27 is pressed against the side surface 26 of the middle roller from below. In this embodiment, even if the middle roller 25 has a large diameter, there is no need to increase the distance between adjacent spinning machines, and the shaft 25 of the middle row 525
Since the axes of the back roller and the axes of the back roller are parallel to each other, a guide roller as in the above embodiment is not required when the belt is stretched between the axes of the back roller and the middle roller. (Effects of the invention) Since the present invention is constructed as described above, a high draft can be achieved even when spinning long fibers using a spinning machine of the same size as the conventional one (1 fan), and the diameter or rotation of the middle roller Any drafting is possible by setting the speed.Also, since no apron belt is used, there are fewer wearing parts, making it easier to maintain and manage the spinning machine.Furthermore, the drafting force of the front roller causes the spinning machine to wrap around the side of the middle roller. a
The fibers are pressed against the surface of the middle roller, and an appropriate resistance can be applied by selecting the material of the middle roller, the shape of the grooves formed on the surface, etc.

[Brief explanation of drawings]

1 and 2 show an actual example of the present invention, FIG. 1 is a perspective view showing the overall outline, FIG. FIGS. 4 and 5 are partial side views of other embodiments of the invention, showing a conventional example, FIG. 4 being a perspective view showing the overall outline thereof, and FIG. 5 being a partial side view. 1... Sliver, 5... Back roller pair. 8... Front roller pair, 9.10... Guide. 12, 25...middle roller. 14...Middle Nitz Roller Figure 4

Claims (1)

[Claims] 1. In a draft device of a spinning machine in which a middle roller pair is arranged between a back roller pair and a front roller pair to draft the sliver, one roller of the middle roller pair is a drum roller and is pressed against the side surface of the drum roller. A draft device for a spinning machine, characterized in that a middle nip roller is provided, and a fiber supply path is formed for winding fibers from a back roller around the outer peripheral surface of the middle roller and then supplying the fibers to a front roller.