JPS5815421B2 - Pressure roller in thread drawing device of spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention provides a drive roller and a pressure roller that presses against the drive roller and forms a yarn engagement section between the yarn draw-out section of the spinning mechanism and the traverse mechanism of the winding device. In order to automatically transfer the thread to the engaging part in the installed thread pulling device, the automatic thread biting notch provided on one side edge of the pressure roller is improved. Another aspect of the present invention provides the above-mentioned notch shape to prevent an increase in thread tension and reduce thread breakage when the thread is cut. The purpose is to provide a notch shape.

A drive roller and a pressure roller that is in pressure contact with the drive roller are disposed between the yarn drawing-out portion of the spinning mechanism and the traversing mechanism of the winding device, and a notch for automatic yarn biting is provided in the pressure roller, A thread pulling device for facilitating the threading operation after thread splicing is known from Japanese Patent Publication No. 10486/1986.
The configuration is as shown in FIGS. 1 and 2.

That is, the spinning unit includes a spinning chamber (not shown),
The yarn P is drawn out from the rotating spinning chamber by a pair of pull-out rollers, and wound as a cheese 3 by a traversing roller 2 serving as a yarn winding and traversing mechanism. taken.

Note that the above-mentioned pull-out roller is formed by a drive roller 4 and a pressure roller 5.

Further, numerals 6 and 7 are a lower yarn guide and an upper yarn guide that guide the yarn through the engagement portion 8 of the driving roller 4 and the pressure roller 5.

Furthermore, the pressure roller 5 is arranged so that a virtual tangential plane extending from the yarn draw-out point 1 of the spinning unit to the yarn contact point 12 on the traversing roller 2 passes through the pressure roller 5. The annular side edge 9 of the pressure roller 5 is provided with a notch 10'.

In the event of a break in the yarn P, the supply of fiber into the rotating spinning chamber is stopped via a yarn breakage sensing element and the trailing end of the yarn is wound onto the cheese 3 by the traversing roller 2.

During the repair of a thread break, the operator detaches the cheese 3 from the traversing roller 2, returns a certain length of thread P from the cheese 3, and passes the free end of this thread P through the thread withdrawal point 1.

Due to the suction effect of the spinning chamber, the yarn is conveyed onto the collecting surface of the spinning chamber where it joins with the fibers in the spinning chamber.

At the same time, the operator returns the cheese 3 again and brings it into contact with the traversing roller 2, so the yarn P starts to be pulled out of the spinning chamber again and is about to be wound onto the cheese 3, but the yarn end is in the spinning chamber. In synchronization with the arrival of the fiber into the spinning chamber, the feeding device for feeding the fiber into the spinning chamber is activated, and from then on, continuous ejection of the yarn takes place.

At this time, the thread P is the left and right traversing limit line 14 of the virtual plane 11.
and 15, and when the thread P comes near the turning point 16 on the traverse roller 2, that is, when the thread P comes near the traverse limit line 14, the notch 10' bites the thread. It is automatically transferred and introduced into the engaging portion 8 of the pull-out roller.

Therefore, from then on, the thread is moved to the thread pull-out point 1 and the lower thread guide 6.
, the thread engaging portion 8 , the upper thread guide 7 , and the contact point 12 .

The present invention is an improvement in the shape of the notch 10 provided on the pressure roller of the thread drawing device constructed as described above, so that the best effect can be achieved.

When the thread is bitten into the notch 10' and then transferred to the engagement portion 8 between the drive roller 4 and the pressure roller 5, an increase in tension becomes a problem.

This means that in Figure 2, the thread is at point 1-901-902-1.
This is because when changing from path 2 to path 1-6-8-12, the path length becomes longer, and the tension to lengthen is added to the spinning tension, but this increase in tension is The yarn that is spun becomes thicker and larger.
For example, threads with counts 4 and 5 create too much tension, often causing thread breakage.

The first invention was proposed from the viewpoint of alleviating the above-mentioned increase in tension. In particular, the thread path length immediately after biting was made as small as possible.

That is, while the thread is being transferred to the engaging part 8, the thread is bent at the ridge line 101 forming the notch 10 and slides along it in the direction from the starting end 101a to the terminal end 101n. By keeping the distance from the center O of the pressure roller 5 small, fluctuations in yarn tension are reduced.

This is because the yarn can be brought closer to the virtual tangent plane 11 in FIG.

As shown in FIG. 2, the conventional notch 1σ ridge 101'
intersects the ridge line 107 in a straight line, but in the present invention, in order to bring the terminal end 101n of the ridge line 101 closer to the roller center O,
The surfaces are now formed so that the ridgeline 101 is formed by two or more straight lines or curves.

Figure 3 is the simplest example, with two straight lines 101A.

101B forms a ridgeline 101, and when the pressure roller 5 rotates and the thread is first bitten by the notch 10, the thread is tensioned to form the ridgeline end 1 which is the small diameter portion r2.
01n and will surely engage the notch 10.

At this time, the threads come into contact at the terminal end 101n at a large bending angle, so the slip resistance is also small.

When the pressure roller 5 further rotates, the yarn ends at the end 10.
1n moves away from 1, but since this is a transition of a small diameter portion r2p that has not been seen in the past, the increase in tension is smaller than in the past.

In fact, the increase in thread tension is most noticeable from the time of biting at this notch to immediately after that, but in the present invention, since the thread can be bent at the ridgeline at the small diameter portion r2, the increase in tension can be alleviated. become.

As the yarn route changes, that is, the yarn transfer progresses, the yarn reaches the ridge line 101.
When reaching A, the ridgeline 101A approaches a state substantially along the running direction of the yarn, and the tension of the yarn makes it easier to slide toward the ridgeline starting end 101a, so the increase in tension does not become so large.

Figure 4 shows four straight lines 101A, 101B, and 101C.

The ridgeline 101 is formed at 101D, and the distance from the center 0 is gradually decreased according to the order ( r
1 > r 2 > r 3 > r 4 ).

The ridge line 101B and subsequent lines are newly added compared to the conventional one, and the distance between the tangential plane and a plane that includes the center 0 and is parallel to the tangential plane is r2. Since r3tr4 is gradually reduced, when the notch 10 bites into the thread and displaces the thread in a direction perpendicular to the running direction, the ridgeline r2+r3 of a small distance
．． It quickly moves along r4 to the ridgeline end 101n.

Since the distance r4 from the center O of the pressure roller 5 is the minimum at the terminal end 101n, the amount of displacement in the direction perpendicular to the yarn running direction is small, and the increase in tension can be alleviated accordingly.

Thereafter, the thread moves from the ridgeline terminal end 101n toward the starting end 101a, but the distance r is smaller than that of the conventional method.4. T3. T
The increase in tension when sliding the thread 2 can be reduced compared to the conventional method, and when sliding along the ridge line 101A with the maximum distance r1, the direction is almost parallel to the yarn running direction, so the tension can be easily and quickly reduced without causing a large increase in tension. Starting end 101
a, and is guided to the engaging portion 8 with the drive roller 4°.

The embodiment of FIG. 5 has four songs - 101A and 101B.

A ridge line 101 is formed by 101C and 101D,
The distance between the tangential plane and a plane that includes the center O and is parallel to the tangential plane decreases in the above order.

(rl>r2>T3>T4). and each ridgeline 1
The actions of 01A, 101B, 101C, and 101D are the same as in the above two examples.

In this way, the side ridgeline 101 of the pressure roller 5 is formed by two or more straight lines or curved lines, and the distance between the ridge line ρ tangent plane and the pressure roller center O becomes smaller as it reaches from the ridgeline starting end 101a to the terminal end 101n. As a result, the thread immediately after being bitten into the notch 10 is moved to the thread pull-out point 1 in Fig. 2.
In order to move to the shortest distance between the traversing roller 2 and the circus 12 on the traversing roller 2, it is possible to quickly move to the ridgeline terminal end 101n.
Therefore, the engagement of the notch 10 is ensured, and
Since the distance from the center O near the ridgeline end 101n is small, the displacement is small when changing the optical path immediately after the thread is bitten, and the increase in thread tension can be reduced compared to the conventional method.
Even when spinning large-count yarn with extremely high tension,
This can be expected to prevent the phenomenon of thread breakage.

Another problem when spinning thick yarn is that the knot 10
This is due to the deterioration of the thread biting performance.

Although the yarn biting performance has been improved to some extent by the first invention, there is still room for improvement.

In the second invention, the notch 10 of the pressure roller 5 is improved from the viewpoint of further improving the yarn biting performance.

When analyzing the yarn biting ability of the conventional notch 10 in which the ridge line 102' is in a straight line, it is found that
Figure 6B shows the state immediately after the thread is bitten, and the thread P is at the ridge starting end 102.
It slides from a toward the terminal end 102n.

The intersection of the ridge line 102 with the raw side edge 9 (the tangent line (H-H) and the extension line of the ridge line 102 form an angle θ, and the thread P is at the tangent line H-H)
Assume that the notch 19 is engaged at a position forming δ1 with respect to H.

Here, the angle δ1 at which the thread P engages is determined by the related dimensions of the machine and is unrelated to the shape of the notch 10.

That is, the angle δ1 is constant.

If the frictional resistance between the yarn and the pressure roller 5 is ignored, and the spinning tension of the yarn P is T1, the force Th1 for sliding (or rolling) on the ridge line 102 is given by the following equation as a component force of T1. .

Th1 =TI Cosβ1=TICO8(?-δ1)
From this formula, Th1, the force that tries to bite the thread, is the angle? It can be seen that the larger the value, the smaller the value.

Therefore, in order to improve the biting performance of the ridgeline 101 at least near the starting end 101a, it is desirable to make the angle 7 as small as possible.

Next, referring to FIGS. 7A and 7B, this shows a state in which the thread is engaged with the notch 10 and changing the optical path, and at this time, the direction of the force in which the thread tension moves against the shaft 102 is It will be the opposite of what it was immediately after the crowding.

In other words, if we ignore frictional resistance and consider the balance of forces,
Assuming that the angle δ2 is constant as in Figures 6A and 6B, the formula Th2 = T25in (f? - (α2 + δ2)) holds true, and the force Th2 in this case is caused by the force of the thread P slipping along the ridge line 102 and coming off the notch 10. It becomes the power to do.

And in this case, is the force Th2 an angle? It can be seen that the larger the value, the larger the value.

Therefore, in this case as well, it is necessary to make the angle θ as small as possible to reduce the force Th2 that causes the thread P to come off from the notch 10.

In short, the larger the angle i formed by the contact point HH at the intersection of the ridge line 102 of the notch 10 and the side edge 9 with the extension line of the ridge line 102, the lower the thread P biting ability.

In the present invention, the above-mentioned angle? East ridge line 102 should be made as small as possible.
was formed by a curve or two or more straight lines.

As is clear from the example shown in FIG. 8, when the ridge line 102 is formed by a curved line with a single radius, the tangent line between the ridge line 102 and the tangent line HH at the point where the tangent line intersects with the side edge 9 of the pressure roller 5 Since the angle is smaller as it approaches the ridgeline starting end 102a, from the above equation, the force toward the ridgeline end 102n, that is, the biting force, increases immediately after biting.

That is, a plane tangent to it near the starting end 102a,
What is the angle between this tangent plane and the tangent line H-H at the point where it intersects with the side edge 9? It is preferable that the value is as small as possible.

Furthermore, even while the optical path is being changed, as shown in FIG.
The closer to a, the smaller the value is, and when the spinning tension is the same, the value is extremely small compared to the conventional straight edge line 102', and after all, the yarn P is difficult to come off from the notch 10.

In the example shown in Figure 3.4.5, the edge line 102 is formed with a single radius.

In the vicinity of the ridgeline end 102n, even though the thread P passes through, it does not substantially affect the thread biting performance.In fact, it is better to form a large space to increase the resistance when changing the thread route. is smaller, which is preferable.

In other words, when the yarn moves to the vicinity of the ridgeline end 102n, the yarn is already completely held by the ridgeline 103 on the peripheral surface, so the force applied to the yarn near the ridgeline end 102n, especially the no. The amount does not substantially affect the thread entrapment performance.

In FIG. 10, a ridgeline 102 is formed by two straight lines, and the angle θ between the straight line including the ridgeline starting end 102a and the tangent H-H at the intersection with the side edge 9 is made as small as possible, and the ridgeline ending point The straight line including 102n enlarges the space formed by the straight line including the ridgeline starting end 102a and the ridgeline 101.

As described above, according to the present invention, it is possible to improve the probability of thread biting even though the thread runs at high speed and traverses at high speed in the thread drawing device of a spinning machine that has become extremely fast these days. Once the thread is bitten, it is difficult to come off, and the tension of the thread can be relaxed compared to conventional threads, so it is also advantageous for large-count yarns that have high tension and have elements that are difficult to bite.

[Brief explanation of the drawing]

1 and 2 show a thread drawing device of a spinning machine in which the pressure roller of the present invention is adopted, in which FIG. 1 is a front view, FIG. 2 is a side view, and FIGS. 3, 4, and 5. 6A and 6B are perspective views showing respective embodiments of the pressure roller according to the present invention, FIGS. 6A and 6B are conventional engagement relationships with the yarn immediately after the yarn is bitten, FIG. 6A is a side view, and FIG. 6B is a side view. The figure is an enlarged side view of the main part, Figs. 7A and 7B show the engagement relationship with the thread during the conventional optical path change, Fig. 7A is a side view, and Fig. 7B is an enlarged side view of the main part. Fig. 8 is an enlarged side view of the main part showing the engagement relationship with the thread immediately after the thread is bitten in the present invention, and Fig. 9 is an enlarged side view of the main part showing the engagement relation with the thread during the optical path change according to the invention. Enlarged side view,
FIG. 10 is an enlarged side view of main parts showing another embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A drive roller 4 and a yarn engaging portion 8 in pressure contact therewith are provided between the yarn drawing-out portion of the spinning mechanism and the traversing mechanism of the winding device.
A pressure roller 5 is provided on one side edge 9 of the pressure roller 5 to form a notch 10 for transferring the thread to the thread engagement portion 8. Among the side ridgelines 101 and 102 forming the ridgeline 101, which is formed by two or more straight lines or curved lines, the ridgeline 101 includes the tangential plane of the ridgeline 101 and the center O of the pressure roller 5, and the tangential plane The distance from the parallel plane to the starting edge of the ridge line is 10
A pressure roller characterized in that the pressure roller becomes smaller from 1a to a terminal end 101n. 2. A pressure roller 5, which is in slight pressure contact with the drive roller 4 to form the thread engagement section 8, is disposed between the drawing-out section of the spinning mechanism and the traversing mechanism of the winding device, and the pressure roller'' A notch 10 for transferring the thread to the thread engaging portion 8 is formed on one side edge of the thread 5, and the ridge line 101 of the side ridge lines 101 and 102 forming the notch 10 is formed by two or more straight or curved lines. The distance between the tangential plane of the ridgeline 101 and a plane that includes the fifth center O of the pressure roller and is parallel to the tangential plane is defined as the distance from the ridgeline starting end 101a.
The ridge line 102 has an angle θ formed by a plane tangent to it near the starting edge 102a and a tangent line H-H at the point where the tangential plane intersects the side edge 9. A pressure roller characterized by being formed with a curved line or two or more straight lines in order to reduce the size of the pressure roller.